The time taken for a given amount of 32P to decay to one-eight of its original activity is 42 days.
A substance's half-life is the amount of time it takes for half of it to decompose. Given that each half-life period diminishes the activity by a factor of 2, if a given amount of a material with a half-life of 14 days decays to one-eighth of its initial activity, it must have gone through three half-life periods. Therefore, it would take 14 x 3 = 42 days for a given amount of 32P to decay to one-eighth of its initial activity.
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What would happen to the boilling point of water at 8000m above sea level where air pressure is lower
The boiling point will be lower, because water boils when its vapor pressure is equal to atmospheric pressure.
What is atmospheric pressure?Atmospheric pressure is described as the force exerted on a surface by the air above it as gravity pulls it to Earth. Atmospheric pressure is commonly measured with a barometer.
If you are at 8 000 m above sea level, the air pressure is lower than one atmosphere and the equilibrium between the water and air pressures will be reached before.
In conclusion, Atmospheric pressure is caused by the weight of the air molecules above.
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The boiling point of water at 8000m above sea level where air pressure is lower would be significantly lower.
How does air pressure affect boiling point ?The boiling point of water decreases as the air pressure decreases. At an altitude of 8000 meters above sea level, the air pressure is significantly lower than it is at sea level, so the boiling point of water would also be significantly lower.
At sea level, the normal boiling point of water is 100 degrees Celsius (212 degrees Fahrenheit) at a standard atmospheric pressure of 101.3 kPa. As the altitude increases, the atmospheric pressure decreases, so the boiling point of water decreases as well.
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If an engineer is designing a building in an area that has an occasional
supersonic flight pass over it, the engineer should:
A. Design the building with extra stores of oxygen for the workers in
case of emergencies caused by sonic booms.
B. Build the structure using materials that are heat resistant because
of the sonic booms.
C. Design extra reinforcements in the building's windows so that they
can withstand the vibrations from sonic booms.
D. Design the building with solar panels that can provide energy in
case of electrical outages due to sonic booms.
Design extra reinforcements in the building's windows so that they can withstand the vibrations from sonic booms.
What are Sonic booms?
Sonic booms are shock waves created when an object, such as an aircraft or spacecraft, travels through the air at a speed faster than the speed of sound (approximately 767 mph). Sonic booms generate a loud noise that can be heard over long distances. Sonic booms can cause property damage and are hazardous to people's hearing.
Extra reinforcements in the building's windows can help to absorb the shock of sonic booms. This is done by adding additional layers of materials such as glass, plastic, rubber, or metal to the window frame. These materials will help to dampen the vibrations from sonic booms, reducing the noise and preventing damage to the windows. Additionally, window seals can be installed to reduce air infiltration, further helping to protect the windows from the vibrations of sonic booms.
Hence, Option C is correct.
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What is the evidence for Darwin's theory of evolution?
The evidence for Darwin's theory of evolution is the consistency of the sequence of fossils from early to recent.
Changing populations and species of organisms are at the heart of biological evolution. The British naturalist Charles Darwin is most likely the first individual that comes to mind today when we discuss evolution. The biological evolution via natural selection theory was put out by British biologist Charles Darwin. Darwin believed that species change over time, give rise to new species, and descended from a single ancestor through the process of evolution. Charles Darwin's theory of evolution is known as natural selection. Animals with heritable qualities that aid in survival and reproduction will often generate more offspring than their contemporaries due to the limited resources in nature, increasing the frequency of such traits through subsequent generations.Populations change throughout time through natural selection, becoming increasingly adapted to their surroundings. Natural selection is reliant on the environment and necessitates the presence of heritable variation within a population.
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In regard to the E2 mechanism, rank the leaving groups in order of increasing reaction rate.
Slowest
Fastest
R-F R-I R-Cl R-Br
In the E2 mechanism, the rate of the reaction is affected by the strength of the bond between the leaving group and the carbon atom, as well as the stability of the resulting carbocation intermediate.
The order of the leaving groups in terms of increasing reaction rate would be:
Slowest: R-F
R-F is a relatively weak bond and the fluoride ion is a very poor leaving group, so the reaction rate would be slow.
R-Br
R-Cl
R-I
Fastest: R-I
R-I is a relatively strong bond and the iodide ion is a very good leaving group, so the reaction rate would be fastest.
R-Cl
R-Br
In short, the stability of the leaving group decreases as the atomic number of the atom increases, and the bond dissociation energy of the leaving group also decreases. So, it is Iodide>Chloride>Bromide>Fluoride.
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Draw the structure of the major organic product(s) of the following reaction.
excess Br2
excess OH
The major organic product of this reaction is 2-bromobutane, a saturated hydrocarbon with a bromine atom attached to the second carbon atom.
The major organic product is 2-bromobutane.
Structure:
CH3 CH2 CH2 CH2 Br
| | |
CH3 CH2 Br
1) The reaction begins with bromine reacting with the 2-methylpropane molecule to form the intermediate 2-bromo-2-methylpropane.
2) The intermediate then reacts with hydroxide ions to form the final product, 2-bromobutane.
3) The final product is a saturated hydrocarbon with a bromine atom attached to the second carbon atom.
The major organic product of this reaction is 2-bromobutane, a saturated hydrocarbon with a bromine atom attached to the second carbon atom.
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Which represents the greatest mass?
• all the same
• 1.0 mol P
• 1.0 mol I
• 1.0 mol K
• 1.0 mol Al
Answer:
it is 1 mole of I is correct
What are the composite units of each type of solid? What types of forces hold each type of solid together? Match the items in the left column to the appropriate blanks in the sentences on the right. Reset Help nonbonding Molecular solids are those solids whose composite units are together by the following kinds of intermolecular forces: Molecular solids are held bonding coulombic forces and hydrogen lonic solids are those solids whose composite units are Ionic solids are held together Individual atoms by dispersion forces network covalent dispersion forces, dipole- dipole forces Atomic solids are those solids whose composite units are Atomic solids can themselves bo divided into three following categories, where each is held together by a different kind of force. The first category, which includes only the noble gases in their solid form and is held together by relatively weak atomic solids. The second category, which is held together by bonds and includes such examples as copper or silver, is atomic solids. The last category, which is hold together by and includes such examples as diamond, graphito, and silicon dioxide, is atomic solids ions metallic molecules covalent bonds lon-dipole forces
Solids known as molecular solids are made up of molecules. Intermolecular forces such as hydrogen bonds, dipole-dipole forces, and dispersion forces hold together molecular solids. Solids with ions as their constituent parts are known as ionic solids. Ion-dipole forces keep ionic solids together.
Atomic solids are those whose constituent atoms make up their entire structure. Atomic solids can be broken down into the three categories below, each of which is held together by a distinct set of forces. Dispersion forces atomic solids is the first category, which only consists of noble gases in their solid states and is held together by coulombic forces that are comparatively weak. Metallic atomic solids fall under the second category, which is held together by nonbonding bonds and contains substances like copper and silver as examples. Network covalent atomic solids are the final group of materials that are held together by covalent bonds and include materials like silicon dioxide, graphite, and diamond.
What five intermolecular forces exist?Intermolecular forces can be divided into three categories: hydrogen bonds, dipole-dipole interactions, and London dispersion forces (LDF). Despite the fact that molecules can have any combination of these three types of intermolecular forces, all substances at least have LDF.
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How many atoms are there in a 2 moles of oxygen atoms? How many atoms are there in 2 moles of oxygen molecules?
There are 6.022 x 10^23 atoms in 2 moles of oxygen atoms. There are 2 x 6.022 x 10^23 atoms in 2 moles of oxygen molecules.
What is molecules?Molecules are the smallest particles of a substance that can exist on its own and retain the chemical properties of that substance. Molecules are composed of atoms that are held together by chemical bonds. Molecules can be composed of atoms of the same element, such as oxygen molecules that are composed of two oxygen atoms, or of atoms of different elements, such as water molecules composed of two hydrogen atoms and one oxygen atom.
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What happens to the energy put into the ice maker? (What is it used to do? How
is it transformed or transferred?)
Answer:
When ice or any other solid melts, its potential energy increases. Indeed, this is the only increase in energy, since the thermal kinetic energy, or temperature, does not increase while melting. Potential energy is the latent energy that could be released by the water, and this increases because the water will release heat energy if it is frozen solid again.
Ice is the lowest energy state of water at normal Earth pressures. At each phase change of water, whether ice to liquid water or liquid water to water vapor, the potential energy decreases. This is due to the Law of Conservation of Energy. Materials undergoing a change of state absorb or release heat energy, but their temperatures do not change. This is because, while the state change is occurring, all the heat energy is converted into the potential energy of the new state of matter.
Water, in particular, has a very large change in potential energy during phase changes. It takes a great deal of energy to change water from one state to another. This is because of the strong hydrogen bonds that form between water molecules. The liquid phase allows water molecules to be in contact with each other, while the solid phase puts water molecules in an overall optimal configuration relative to each other.
Explanation:
What is the relationship between CO2 levels and sea levels?
The relationship between the CO₂ and the sea levels is the carbon dioxide is higher about 10 % at deep ocean than the surface.
This warms world due to the greenhouse gases that included the carbon dioxide , the water heat up and it expands due to which the sea level rises. if we remove the extra heat from the ocean that caused by the short lived gases , it lowers the sea levels and this process is very slow.
The carbon dioxide that dissolves in the ocean will cause the sea water to be acidify. this will harmful for the shellfish and the corals.
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4 P (s) + 5 O2 (g) -> P4O10 (s)
If 0.554 mol of phosphorus burns, what mass of oxygen is used?
MassMass of oxygen used on combustion of 0.554 mol of phosphorus is 957.12 g.
What is combustion?Combustion is the name given to the chemical reaction in which a material combines with oxygen to produce heat. A substance is said to be combustible if it can burn. Another name for it is fuel. Fuel can be either solid, liquid, or gaseous.
Since, 4 moles of phosphorus burns in the presence of 5 moles of oxygen
Therefore, 0.554 moles of phosphorus will burn in presence of 54×0.554=29.91 moles of oxygen.
Molar mass of oxygen is 32 g/mol.
Hence, mass of oxygen used can be calculated by:
Mass of oxygen used under given reaction conditions =32×29.91⇒957.12 g.
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Mass of oxygen used on combustion of 0.554 mol of phosphorus is 957.12 g. Oxygen has an atomic mass of 15.9994. ss.
What is combustion?Combustion is the name given to the chemical reaction in which a material combines with oxygen to produce heat. Another name for it is fuel. Fuel can be either solid, liquid, or gaseous.
What is combustion of phosphorus?4 moles of phosphorus burns in the presence of 5 moles of oxygen 0.554 moles of phosphorus will burn in presence of 54×0.554=29.91 moles of oxygen. Molar mass of oxygen is 32 g/mol. Mass of oxygen used under given reaction conditions 32×29.9 = 957.12 g.
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different between ionic and metallic bond
Answer:
Whereas ionic bonds join metals to non-metals, metallic bonding joins a bulk of metal atoms.
Explanation:
hope this helps
The overall charge of an atom or ion is ________ if the number of electrons is ________ than the number of protons.
The overall charge of an atom or ion is negative if the number of electrons is greater than the number of protons.
What is electron?A subatomic particle with a negative charge is called an electron. It is found outside the nucleus of an atom and is one of the main constituents of matter. Electrons are responsible for the chemical properties of atoms and thus play an important role in chemical reactions. Electrons have low mass and move around the nucleus at relativistic speeds. They are also responsible for the electrical and magnetic properties of atoms, and for the transmission of light and other forms of energy. Electrons can also interact with other particles and form complex structures, such as molecules.
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Why is the mass of one mole of carbon (C) less than the mass of one mole Oxygen (O), even though the number of atoms of each element is the same
Chemistry quizzes What is the mass of a single carbon atom if a mole of carbon atoms weighs 12 grams. The fact that 1 mole of carbon atoms weighs 12 grams is a given.
There are 6. 022 10 23 atoms in total, or Avogadro's number, in a mole of carbon atoms. As a result, 1 carbon atom weighs 2 10 - 23 g (in grams). The weight of one mole of carbon atoms is 12 g. 12 g to 12 amu. Because we defined the mole to make it so, the atomic mass and molar mass are in agreement. A material can have a variable mass per mole while yet having the same number of particles. Are there any examples you might use to support the claim? In current usage, the term "mole" merely denotes a group of countable items, more specifically the Avogadro number of the entities in question.
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What forces are acting on a meter stick?
Whenever the meter stick stood by itself, two forces were acting on it: some upward pressure of the fulcrum as well as the descending gravity force.
To demonstrate that the resultant force was zero when the metre stick has been in equilibrium, you must balance forces acting on it in the first section. To figure out the mass of the meter stick, you should balance the metre stick's weight against with a known weight inside the second section.
In the event that the ruler was balanced, the support which it is resting applies a force equal in strength to that of the weight's opposite force. Therefore, the ruler is being acted upon by its weight as well as the friction coefficient somewhere at support.
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18) Write the expression: the sum of the quantity h and 2 divided by 4. A) h 4 2 B) h 2 4 C) h 2 4 D) 4 h 2
The expression is [tex]\frac{(h+2)}{4}[/tex] which can be solved by BODMAS rule
The abbreviation BODMAS, which stands for "Brackets, Order of powers or roots, Division, and Multiplication," is followed by the BODMAS rule. A stands for addition and S for subtraction. According to the BODMAS rule, multi-step mathematical statements must be solved in the BODMAS order from left to right. Similar to how Addition and Subtraction depend on which comes first in the sentence, Division and Multiplication are thought of as interchangeable operations.
The expression can be written as follows WE have 2 quantities h and 2
Their sum can be written as h+2 Now We have the sum divided by 4 so it can be written as : [tex]\frac{(h+2)}{4}[/tex]
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Express the answers to the following operations with the proper number of significant figures.
4. 108 x 5. 3
____ X 10^
The answer to the given operations with proper number of significant figures is 5.7 × 10².
Significant figures or numbers can be defined as those particular numbers or digits which are essential in determining the accuracy of a particular value. For example, 4.392 has 4 significant figures.
When we are rounding off a number to write it with the proper number of significant figures, we first need to decide the amount of significant figures that it should have.
On calculating the given operation,
⇒ 108 × 5.3 = 572.4
In significant figures,
= 5.72 × 10²
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16% of m is 28
16% x m = 28
0.16 x m = 28
m = ...
Answer:
m=175
Explanation:
100/16 = 6.25
6.25x28 = 175
Answer: To solve this equation for m, you can divide both sides of the equation by 0.16. This will give you:
m = 28 / 0.16
Simplifying the right side of the equation gives:
m = 175
Therefore, m = 175.
Explanation:
We observe that 0.123 mole of the element bromine combines with 0.123 mole of the element lead to form a compound. What is the empirical formula for the compound?
The empirical formula of the compound with 0.123 moles of bromine and 0.123 moles of lead would be PbBr.
Empirical formula determinationThe empirical formula of a compound is the chemical formula of the compound where the component atoms are in their simplest, whole-number ratios.
In this case, the compound contains bromine and lead:
Br = 0.123 mole
Pb = 0.123 mole
Dividing through by the smallest mole
Br = 0.123/0.123 = 1
Pb = 0.123/0.123 = 1
Thus, bromine and lead are present in a 1:1 ratio in the chemical formula.
In other words, the empirical formula of the compound containing 0.123 moles of bromine and 0.123 moles of lead is PbBr.
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What are the products of the following reaction?
OCH2CH2OH excess HBr--> heat
O Br - OCH2CH2Br
O Br + BrCH2CH2OH
O OH + BrCH2CH2Br
O Br + BrCH2CH2Br
The products of the reaction of OCH2CH2OH with excess HBr under heat are: OCH2CH2Br (2-bromoethanol) and BrCH2CH2OH (1-bromo-1-propanol)
The mechanism for the reaction of OCH2CH2OH with excess HBr under heat is a multi-step process that involves the formation of a carbocation intermediate. Step 1: Protonation of the oxygen atom in OCH2CH2OH by HBr to form a good leaving group (OH) and a carbocation intermediate.
Step 2: Bromine atom from HBr attacks the positively charged carbon of the carbocation intermediate to form a covalent bond, resulting in the formation of intermediate compound.Step 3: Deprotonation of the intermediate compound by the remaining hydroxyl group to give OCH2CH2Br (2-bromoethanol) and HBr
Step 4: the HBr molecule from the step 3 could protonate another molecule of OCH2CH2OH and repeat the step 1 to 3 to form BrCH2CH2Br (1-bromo-1-propanol) as second product.
Overall, the reaction is an electrophilic substitution reaction, with HBr as the electrophile and the oxygen atom of the alcohol as the nucleophile.
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anybody know the answer for these
KI - Ionic compound, KCl - Ionic compound,
C₆H₁₂O₆ - Covalent compound, KNO₃ - Ionic compound,
C₆H₄Cl₂ - Covalent compound, C₆H₅COOH - Covalent compound
CH₃COOH - Covalent compound, Parafin wax - Covalent
HCl - Covalent compound
What are ionic and covalent compounds?Ionic compounds can be classified as compounds formed between cation ions and an anion. A cation can be described as an electropositive ion and has the tendency to donate valence electrons. Similarly, anions are electronegative ions and have a tendency to accept electrons.
In an ionic compound, an ionic bond contains the complete transfer of electrons, therefore, there exists an electrostatic force of attraction that forms a strong bond.
In a covalent compound, the covalent bond exhibits the mutual sharing of electrons. Shared pairs of electrons are hard to give away as nuclei of two chemical elements together share the electrons and produce a bond stronger.
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Identify one advantage to each of the following models of electron configuration: Dot structures Arrow and line diagrams Written electron configurations Type in your answer below.
Simple Lewis dot structures make it easy to see how many valence electrons are present in an atom. Valence electrons are shown as dots surrounding the atom that are organized in pairs in Lewis dot formations.
Electron spin direction is displayed using arrow and line diagrams, along with each orbital. The electron configuration of atoms is shown using arrow and line diagrams or orbital diagrams, which use boxes and arrows to indicate the different orbitals and the pairing arrangement of electrons. This model has the benefit of displaying each orbital as well as the electrons' spin polarity.
Written electron configurations are concise and also depict how the electrons are distributed throughout the sublevels. The number of electrons in a specific sublevel is indicated by superscripts in written electron configuration notation. Written electronic configuration has the advantage of being more compact due to the removal of boxes and arrows. It also displays how electrons are distributed among sublevels.
The arrangement of electrons within an atom's orbitals, shells, and subshells is known as electron configuration.
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Answer:
Dot structures make it easy to count electrons and they show the number of electrons in each electron shell.
Arrow and line diagrams show the spin of electrons and show every orbital.
Written configurations require minimal space and show the distribution of electrons between subshells.
Explanation:
correct on edg 2023
A bleaching solution requires 6. 55 g of sodium hypochlorite. How many grams of a 21. 5% by mass solution of sodium hypochlorite should be used
A bleaching solution requires 6. 55 g of sodium hypochlorite. 30.47 grams of a 21. 5% by mass solution of sodium hypochlorite should be used
Mass of sodium hypochlorite = 6.55 g
percent composition = 21. 5%
This indicates that there are 21.5 grams of sodium hypochlorite present in every one hundred grams of solution.
Now calculate the number of grams of solution for 6.55 g of solution.
(6.55 g x 100) / 21.5 g = 30.47 g
Therefore, you will need 30.47 grams of a sodium hypochlorite solution that has a mass concentration of 21.5% in order to obtain 6.55 grams of sodium hypochlorite.
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Use the data table to answer the question that follows.
Production Possibilities for One Year
Cheese
(millions of tons)
United States
Italy
Tomatoes
(millions of tons)
2
1
EEEEE
Which statement is supported by the data table?
O The United States should produce neither cheese nor tomatoes but rather import them.
The United States should produce all its own cheese and tomatoes for consumption.
The United States should specialize in tomatoes and trade them for cheese from Italy.
O The United States should specialize in cheese and trade it for tomatoes from Italy.
On this scenario, the US may consume more than its PPC by specializing in cheese and swapping it for Italian tomatoes.
What makes this possible?Italy’s cheese output is lower than that of the United States.Italy cannot consume cheese other than PPC unless these products are supplied by another nation. Through an exchange deal with Italy, the United States can enjoy tomatoes in addition to PPC. Because cheese production in the United States is substantially higher than in Italy, we may assume that the United States can offer this commodity to other nations without jeopardizing its consumption. However, tomato output in the United States is the same as in Italy, but because the United States is a larger country than Italy, tomato consumption in the country may be affected.
As a result, if tomatoes are obtained from another nation, tomato consumption in the United States may surpass the PPC of tomatoes. This may be accomplished through barter, with the United States supplying cheese to Italy and Italy supplying tomatoes to the United States.
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You have a 400-mL container containing 55. 0% He and 45. 0% Ar by ma at 25°C and 1. 5 atm total preure. You heat the container to 100°C Calculate the ratio of PHe : PAr
The ratio of the container with PHe: PAr will be given as= 12.2/1
All pressures present in a reference system are added together to get the total pressure, or ptot. Bernoulli (see Fluid mechanics) defined this pressure as the sum of the static pressure (p), dynamic pressure (pdyn), and geodetic component (g, z) that exist in a fluid along a stream line in a frictionless flow.The pascal (Pa), often known as kilograms per square meter per second (kg/m1s2), is the SI unit for pressure. Prior to 1971, pressure in SI was only expressed in terms of newtons per square meter; this nomenclature for the unit was added at that time. While a fluid is stationary or when you are moving with it, you have static pressure. You would feel an equal amount of air pressure from all sidesTo know more about pressure here
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The ratio of PHe: PAr will be given as= 12.2/1
All pressures present in a reference system are added together to get the total pressure, or ptot. Bernoulli (see Fluid mechanics) defined this pressure as the sum of the static pressure (p), geodetic component (g, z) and dynamic pressure (pdyn), that exist in a fluid along with a stream line in a frictionless flow. The pascal (Pa), often known as kilograms per square meter per second (kg/m1s2), is the SI unit of pressure. Before 1971, pressure in SI was expressed in terms of newtons per square meter. You have static pressure, while a fluid is stationary or when you are moving with it. You would feel an equal amount of air pressure from all the sides.
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the formula for the selenate ion is seo42−. predict the formula for selenic acid.
Answer:
The formula for selenic acid is H2SeO4.
Explanation:
Selenic acid is an oxoacid of selenium, which means that it contains selenium and oxygen atoms bonded together in a compound that also contains hydrogen atoms. The selenate ion, which has the formula SeO42-, is an ion that contains selenium and oxygen atoms bonded together. Based on these facts, we can predict that the formula for selenic acid will contain selenium, oxygen, and hydrogen atoms.
To determine the specific ratio of atoms in the formula for selenic acid, we can look at the valences of the elements involved. The valence of an element is the number of bonds it can form with other atoms. Selenium has a valence of 6, oxygen has a valence of 2, and hydrogen has a valence of 1.
Since selenium has a valence of 6, it can bond with 6 oxygen atoms. This means that selenic acid will contain at least one selenium atom bonded to 6 oxygen atoms. In addition, selenic acid will contain hydrogen atoms, which can bond with oxygen atoms. Based on these considerations, we can predict that the formula for selenic acid will be H2SeO4, which contains one selenium atom bonded to 6 oxygen atoms and 2 hydrogen atoms.
The density of ________ is 0.900 g/L at STP? a) CO
b)CH4
c) NO
d) Ne
e) N2
Answer:ne
Explanation:
How many total ATP are produced during glycolysis ?
During glycolysis, each G3P produces two ATP, for a total of four ATP per glucose molecule.
What is glycolysis?The metabolic mechanism that transforms glucose to pyruvate is known as glycolysis. This free energy is utilized to create the high-energy molecules adenosine triphosphate and reduced nicotinamide adenine dinucleotide. Glycolysis is a series of 10 enzyme-catalyzed processes. The initial stage in the breakdown of glucose to extract energy for cellular metabolism is glycolysis. Glycolysis is divided into two phases: energy-requiring and energy-releasing. Glycolysis is the process of breaking down glucose to create energy. It generates two pyruvate molecules, ATP, NADH, and water. The process occurs in a cell's cytoplasm and does not require oxygen. It can be found in aerobic and anaerobic organisms.
Here,
Each G3P produces two ATP during glycolysis, for a total of four ATP per glucose molecule.
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Select the correct answer. given: sno2 2h2 → sn 2h2o tin oxide reacts with hydrogen to produce tin and water. how many moles of sno2 are needed to produce 500.0 grams of sn?
a. 1.57
b. 4.21
c. 634.8
d. 59,350
4.21 moles of SnO₂ are needed to produce 500.0 grams of Sn for the given reaction.
What is tin oxide reaction?Tin oxide, is a compound with the formula SnO₂. It is a white or gray powder that is insoluble in water but soluble in strong acids and strong alkalis. Tin oxide is widely used as a pigment in ceramics, glasses, and paints, and in the manufacture of electronic devices such as transistors and solar cells. It is a versatile compound with a wide range of uses and can undergo several important reactions such as: Reduction to tin metal, formation of tin dioxide, formation of tin salts by reaction with acids.
For the given reaction:
SnO₂ + 2H₂ → Sn + 2H₂O
Mole ratio of SnO₂ and Sn is 1:1; this means 1 mole of SnO₂ is required to prepare each mole of Sn.
Now, for the moles of Sn:
n = m/M
Where, n = number of moles
m = mass of Sn (500 g)
M = molar mass of Sn (118.71 g/mol)
n = 500/118.71
n = 4.21 moles
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Assume that you want to create 50.0 g aqueous solution that is 6.213% by mass sodium chloride. How many grams of sodium chloride should you start with
With 3.11 grams of sodium chloride we should start to make an aqueous solution of 50. 0 gm.
When water is used as a solvent then the solution is called the aqueous solution. Water is a good solvent which is naturally abundant and in chemistry, the word "solution" refers to the aqueous solution unless the solvent is specified. It is denoted by "aq".
Mass of aqueous solution = 50 gm
Mass percentage of sodium chloride = 6.213%
Let the mass of sodium chloride is N grams, then,
N = (50/100) × 6.213 gm
N = 0.5 × 6.213
N = 3.11 grams
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