Answers
The five elements of chemical change include colour change, precipitate or gas formation, odour change, temperature change, and gas or precipitate formation.
How do I determine which indication to employ?When choosing an indicator for acid-base titrations, pick one whose pH range is compatible with the reaction's pH change. As an illustration, the pH quickly rises from 3 to 11 when a strong acid and base are titrated.
An indication in a chemical process is what?Chemical indicator: Any substance that can be used to detect the presence or absence of a chemical species at a threshold concentration in a solution, such as an acid or an alkali, usually by changing colour. Methyl yellow is a good illustration of this.
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Related Questions
1. Define acids and bases in terms of their chemical properties2. Compare and contrast the common properties of acids and bases.
Answers
Answer: Acids are chemical substances which are characterized by a sour taste in water medium. Bases are the chemical substances which are characterized by a bitter taste and are slippery to touch.
Explanation:
Acids have tendency to turn blue litmus to red. Some bases are soluble in water, while others are not. Water soluble bases are known as alkalis. They have tendency to turn red litmus to blue.
Acids and bases react with a wide range of chemical compounds to form salts.
Chemical properties of the following:
Reaction of acids and bases with metals. When a metal reacts with an acid, it generally displaces hydrogen from the acids. This leads to the evolution of hydrogen gas. The metals combine with the remaining part of acids to form a salt. Alkalis (bases that are soluble in water) react with metals to produce salt and hydrogen gas.
For example, the reaction of sulphuric acid with zinc.
H₂SO₄ ⁺ ZN ⇒ ZnSO₄ ⁺ H₂
For example, reaction of zinc with sodium hydroxide.
NaOH ⁺ Zn ⇒ Na₂ZnO₂ ⁺ H₂
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According to the law of conservation of mass, matter can be ________
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Answer: According to the law of conservation of mass, matter can be neither created nor destroyed, but it can be transformed from one form to another.
Explanation: The law of conservation of mass is one of the fundamental principles of physics, which states that the total mass of a closed system remains constant over time. In other words, matter can be neither created nor destroyed, but it can be transformed from one form to another, such as through chemical reactions or nuclear reactions. This principle is based on the work of Antoine Lavoisier, who first proposed it in the 18th century.
can the cells of a plant change with different types of plants
Answers
Answer: Yes, the cells of a plant can vary depending on the type of plant.
Explanation: All plants are made up of cells, which are the basic building blocks of life. These cells are organized into tissues and organs, which work together to allow the plant to perform functions such as photosynthesis and reproduction. However, different types of plants have evolved to have specific adaptations in their cells to suit their environment, for example, cactus have thick walls to survive in dry conditions and moss have small cells to absorb water quickly. As a result, the structure and function of plant cells can differ between different species of plants.
Good luck with your assignment
Germanium ( Ge ) is a solid where the atoms are bonded to each other much like those of carbon in a diamond
Answers
Germanium will be having highest melting point being exist in solid
What is Germanium?Germanium itself is classified as a metalloid. It's hard at room temperature and looks metallic with a shiny silvery grey finish, but it's a semiconductor, without some of the key properties of a metalgermanium (Ge), a chemical element between silicon and tin in Group 14 (IVa) of the periodic table, a silvery-gray metalloid, intermediate in properties between the metals and the nonmetalsThe beneficial effects of germanium administration described in the literature, concern its use to prevent or treat cancer, HIV infection, autoimmune diseases, arthritis, and senile osteoporosisGermanium is a chemical element with the symbol Ge and atomic number 32. It is lustrous, hard-brittle, grayish-white and similar in appearance to silicon.To learn more about Germanium refers to:
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nuclear decay that can be stopped by skin or paper.
a. true
b. false
Answers
It is false that nuclear decay that can be stopped by skin or paper.
Most types of nuclear decay, such as alpha and beta decay, cannot be stopped by skin or paper. These types of decay involve the emission of particles (alpha particles or beta particles) that can penetrate through such thin materials. Gamma decay, on the other hand, involves the emission of high-energy electromagnetic radiation, which can be stopped or absorbed by thicker materials such as lead or concrete.
It's important to note that the ability of a material to stop or absorb radiation depends on its atomic structure and density, and the thickness of material.
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Explain how the size of the human population is affected by age structure, survivorship rate fertility, and migration. Make a prediction about the size of the human population. Justify your answer.
Answers
The size of the human population is affected by several factors, including age structure, survivorship rate, fertility, and migration.
Age structure refers to the distribution of individuals in a population by age. A population with a large proportion of young individuals is likely to have higher fertility rates and a higher potential for population growth. A population with a large proportion of older individuals is likely to have lower fertility rates and a lower potential for population growth.Survivorship rate refers to the likelihood of an individual surviving to a certain age. A population with a high survivorship rate is likely to have a larger population overall, as more individuals are living to reproductive age.What is the human population about?Fertility rate refers to the number of children born to women of childbearing age. A population with a high fertility rate is likely to have a higher potential for population growth.
Migration refers to the movement of individuals into or out of a population. A population with high levels of immigration is likely to have a higher potential for population growth, while a population with high levels of emigration is likely to have a lower potential for population growth.
Therefore, It is difficult to predict the size of the human population with certainty, as it depends on many complex factors and can be affected by unexpected events. However, based on current trends and projections, it is likely that the human population will continue to grow in the coming decades, although at a slower rate than in the past.
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There are ___ x 1024 molecules and ___ x 1024 atoms in 2 moles of NH3.
** To convert molecules to atoms, you have to multiply the number of molecules (your 1st answer) by the number of atoms in a single NH3 molecule.**
Round your answer to the tenths place.
Answers
There are 1.20×10²⁴ molecules and 3.60×10²⁴ atoms in 2 moles of NH[tex]_3[/tex]. The smallest unit of matter that may be split without producing electrically charged particles is the atom.
What is atom?The smallest unit of matter that may be split without producing electrically charged particles is the atom. It is also the smallest piece of substance with chemical element-like characteristics. As a result, the atom serves as the fundamental unit of chemistry.
Space makes up the majority of an atom. The remainder is made up of a cloud of electrons with negative charges around a positive-charged nucleus made up of protons and neutrons.
1 mole of NH[tex]_3[/tex], contains 1 nitrogen atom and 3 hydrogen atom
2 mole of NH[tex]_3[/tex], contains 2 nitrogen atom and 6 hydrogen atom
2 mole of NH[tex]_3[/tex], contains 2×6.022×10²³=1.20×10²⁴ nitrogen atom and 6×6.022×10²³=3.60×10²⁴ hydrogen atom
Therefore, there are 1.20×10²⁴ molecules and 3.60×10²⁴ atoms in 2 moles of NH[tex]_3[/tex].
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If i have an unknown quantity of gas at a pressure of 1. 2 atm, a volume of 31 liters, and a temperature of 87 0 c, how many moles of gas do i have?.
Answers
The moles of gas that I have If I have an unknown quantity of gas at a pressure of 1.2 atm, a volume of 31 liters, and a temperature of 87 0 C is 1.26 moles.
To determine the mol of gas, we can use Mendeleev-equation Clapeyron's:
pV = nRT
Where:
n is the number of moles = ?
p is pressure = 1.2 atm
V is volume = 31 liters
T is temperature = 87°C ⇒ (273+87) = 360 K
R is the constant of all gases = 0.082 L.atm/mol.K
So, we can define the n number as:
n = pV/(RT)
n = (1.2) (31) / (0.082) (360) =
1.26 moles
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Calculate the average velocity in m/y of a tectonic plate that ha travelled 9000 km to the outh in 60 million year
Answers
The average velocity of a tectonic plate that has travelled 9000 km to the south in 60 million years is 0.15 m/y.
Average velocity can be obtained by dividing the total which is displacement travelled by the total time taken to cover the displacement. Average velocity can be positive or negative it depends upon the sign of the displacement. SI unit of average velocity can be expressed in meters per second (m/s).
Total displacement = 9000 km
9000 × 1000 = 9000000 m
Total time = 60 million years
60000000 years
Ave. Velocity = Total displacement / total time
Ave. Velocity = 9000000 / 60000000
Ave. Velocity = 0.15 m/y
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Psolvent = X Solvent x Po Psolute = X x Po Psolvet =(1-X ) x Po Delta P = Po Solvent-Psolvent = X x Po Complete the subscript on the following equations above with: Solution or Solvent or Solute
Answers
The equations of vapor pressure are :
P solvent = X solvent × P° solventP solute = X solute × P° soluteP solvent = 1 - X solute × P° solventΔP = P° solvent - P solvent = X solute × P° solventThe colligative properties of the solutions , depend upon the concentration of the solute and not depend of the identity of solute.
The vapor pressure equations are given as :
1) The P° solvent is the pure solvent, X solvent is the mole fraction of the solvent. The equation is given as :
P solvent = X solvent × P° solvent2) The P° solute is the pure solute and the X solute is the mole fraction of the solute. The equation is :
P solute = X solute × P° solute3) X solvent + X solute = 1 , the equation is :
P solvent = 1 - X solute × P° solvent4) ΔP = P° solvent - P solvent = X solute × P° solvent
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what is the percentage mass of oxygen in barium phosphate?
Answers
How many grams of ammonia (NH3) can be produced from the reaction of 28 grams of nitrogen gas with an excess of hydrogen gas?
3H2 (g) + N2 (g) ----> 2 NH3 (g)
A. 5.05 gram NH3
B. 34.0 gram NH3
C. 17.0 gram NH3
D. 51.0 gram NH3
Answers
The grams of ammonia (NH₃) can be produced from the reaction of 28 grams of nitrogen gas with an excess of hydrogen gas is 34 g.
The reaction is given as :
3H₂ + N₂ ----> 2NH₃
The mass of the Nitrogen gas = 28 g
Moles of the N₂ = mass / molar mass
= 28 / 28 g/mol
= 1 mol
The 1 mole of the N₂ produces the 2 moles of the NH₃
Therefore , the moles of the NH₃ = 1 × 2
= 2 mol
The mass of the ammonia, NH₃ = moles × molar mass
= 2 × 17
= 34 g
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What is the formula for speed?
Answers
Answer:
distance/time is the answer
Select the correct K expression for the following reaction: 3 A(aq) + B(s) = 2 Claq) + D(aq)
a. K = 2[C][D] / 3[A]
b. K = [C]^2[D] / [A]^3[B]
c. K =[A]^3 / [C]^2[D]
d. K = [C]^2[D] / [A]^3
Answers
Option (d) is correct. According to the Equilibrium expression, the product raised to its stoichiometric coefficient divided by same of reactant.
The term equilibrium constant expresses the relationship between products and reactants of a reaction at equilibrium. It shows with respect to a specific unit. Equilibrium constant can be expressed as K. It is the ratio of velocity constant of forward reaction to velocity constant of backward reaction. It is also defined as the ratio of product to molar concentration of product to the product of molar concentration of reactants.
K = [C]2 [D] / [A]3 [B]
Now for solids its value is 1. For a heterogeneous mixture, solids and pure liquids and solvents have an activity that has a fixed value of 1.
So, K = [C]2 [D] / [A]3
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A carbon atom has a relative atomic mass of 13.5. 60% of the carbon atom has a mass number of 12.8, 30% of the carbon atom has a mass number of 13.8, whilst the remaining 10% has a mass number which is not known.
Calculate the mass number of the carbon isotope which is 10% of the Carbon 13.5 atom.
Give your answer to 1 decimal place.
Answers
The mass of the unknown isotope is 16.8.
What is the mass of the unknown isotope?Let us know that the relative atomic mass would be the weighted average of all the atomic masses of the elements that we have in the question as it has been stated.
Now we can see that we need to collect the masses of all the isotopes because;
Relative atomic mass = Weighted sum of the masses of all the isotopes
Thus;
13.5 = (0.6 * 12.8) + (0.3 * 13.8) + (0.1 * x)
x = mass of the unknown isotope
x = 13.5 - (7.68 + 4.14)/0.1
x = 16.8
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If the following elements are arranged by increasing atomic radius (from smallest to largest); F, B, Be, O, the correct order would be...
Answers
If the following elements are arranged by increasing atomic radius (from smallest to largest); F, B, Be, O, the correct order would be...F<O<B<Be.
What is Atomic radius ?A chemical element's atomic radius serves as a gauge for the size of its atoms.A chemical element's atomic radius, which is typically the average or typical distance between the nucleus's core and the outermost isolated electron. There are numerous non-equivalent definitions of atomic radius since the border is not a clearly defined physical entity.It also serves as a gauge for the size of an atom. Atomic radius of :F=42pmO=60pmB=85pmBe=112pmTo know more about atomic radius visit
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Given the following reactants, finish and balance the reaction:
Ca(s) + HCl(aq) -->
A. Ca + 2 HCl --> CaCl2 + H2
B. 2 Ca + 2 HCl --> 2 CaCl + H2
C. Ca + HCl --> CaCl + H
D. Ca + 2 HCl --> CaCl2 + 2H
Answers
The correct balanced equation for the reaction of Ca(s) and HCl(aq) is:
D. Ca(s) + 2 HCl(aq) ---> CaCl2(aq) + H2(g)
What is chemical reaction?Chemical reaction, the transformation of one or more chemicals (the reactants) into one or more distinct compounds (the products). Chemical elements or chemical compounds make up substances. In a chemical reaction, the atoms that make up the reactants are rearranged to produce various products.
Chemical reactions are a fundamental component of life itself, as well as technology and culture. Burning fuels, smelting iron, creating glass and pottery, brewing beer, making wine, and making cheese are just a few examples of ancient processes that involved chemical reactions. The Earth's geology, the atmosphere, the oceans, and a wide variety of intricate processes that take place in all living systems are rife with chemical reactions.
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What is the mole fraction of water in methanol when 18 grams of h2o is added to 32 grams of methanol, ch3oh?
Answers
atomic weight of H2O=18
atomic weight of methanol=32
mole =gram weight/atomic weight
mole of H2O = 18/18=1
mole of CH3OH =32/32=1
mole fraction of H2O = mole of H2O/mole of H2O+mole of CH3OH
mole fraction of H2O=1/1+1=1/2=0.5
What is Mole?Mole, also spelled mol, in chemistry, a standard scientific unit for measuring large quantities of very small entities such as atoms, molecules, or other specified particles.The mole designates an extremely large number of units, 6.02214076 × 1023. The General Conference on Weights and Measures defined the mole as this number for the International System of Units (SI) effective from May 20, 2019. The mole was previously defined as the number of atoms determined experimentally to be found in 12 grams of carbon-12.The number of units in a mole also bears the name Avogadro’s number, or Avogadro’s constant, in honour of the Italian physicist Amedeo Avogadro (1776–1856). Avogadro proposed that equal volumes of gases under the same conditions contain the same number of molecules, a hypothesis that proved useful in determining atomic and molecular weights and which led to the concept of the mole.To learn more about Avogadro’s refer to:
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What is the name given to compounds formed when elements or compounds react with oxygen?
Answers
Answer:
oxides
Explanation:
hope this helps have a good day (:
A gas at a pressure of 1 atm is in a
sealed 1.0 L container. What happens
to the pressure when the
temperature is reduced to half of the
original amount?
Answers
The pressure of a gas is directly proportional to its temperature. Hence, as temperature decreases pressure decreases. Therefore, as the temperature reduced to half, pressure also decreases to half. Then option D is correct.
What is Gay- Lussacs law?According to Gay- Lussacs law at constant volume, the pressure of a gas is directly proportional to the temperature.
Hence, P/T = constant.
Let P1 and T1 be the initial pressure and temperature and P2, T2 be the final quantities, then
P1/T1 = P2/T2
Given P1 = 1 atm
T1 = x ° C
T2 = x/2° C
Then P2 = P1 T2/T1
P2 = 1 × x/2° C / x° C
= 1/2 atm
That is one half of the initial pressure.
Therefore, the pressure of the gas reduces to half when temperature is reduced to half.
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how many atoms are there in 2 moles of oxygen molecules?
Answers
There are 12.044 × 10^23 oxygen molecule present in 2mole of oxygen molecule.
According to the context, the word may as well as may not encompass ions that meet this requirement. A molecule is a collection of two as well as more atoms linked together by the attractive forces described as chemical bonds.
The lowest unit into which a substance could be divided while still being the same substance would be a molecule. It is composed of two as well as more atoms which are chemically bonded to one another.
1 mole of oxygen = 1 O2 molecule
2 mole = 2 O2 molecule = 2 × 6.022 × 10^23 molecule = 12.044 × 10^23 molecule
Thus, 2 mole of oxygen will have 12.044 × 10^23 molecule
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A solid whose atoms,ions,or molecules are arranged in a regular, repeating pattern.
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Crystal solid is a solid whose atoms, ions or molecules are arranged in a regular, repeating pattern.
Atoms, ions, and molecules are grouped in a highly ordered microscopic arrangement in repeated and consistent three-dimensional formations to create a crystal lattice, which can stretch in any direction.
A crystal structure is a type of solid state of matter that varies from liquid and gaseous states of matter in which the organization of atoms or molecules is random or haphazard. It is an organized arrangement of atoms, ions, or molecules in a regular repeating pattern.
Triclinic, monoclinic, orthorhombic, tetragonal, trigonal, hexagonal, and cubic crystal formations are also available. Groupings of lattices and lines identify a family of crystals.
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Draw all stereoisomers of 1,2-dichlorocyclohexane. Use bold andhashed wedges to indicate the stereochemistry.
Answers
Stereoisomers are isomers formed by the spacial arrangement of atoms. There are mainly two types of stereoisomers, they are enantiomers, which are the mirror images and diastereomers.
The cis and trans isomerism is a type of configurational isomerism. Cis means on the same side and trans means on the different side. In this case it indicates different planes. In theory we can rotate the atoms between cis and trans configuration, but in real world such a change would not happen, because this process require energy.
In the case of 1,2- Dichlorocyclohexane, there are three stereoisomers. There is one cis and two trans isomers. The three isomers are
(1-S,2-R) Dichlorocyclohexane(1-R,2-R) Dichlorocyclohexane(1-S, 2-S) DichlorocyclohexaneR-S and S-R isomers are interchangeable because they form superimposable mirror images.
So there are three stereoisomers in the case of 1,2 Dichlorocyclohexane.
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d mannose chair conformation:
Answers
The hydroxyl group on the anomeric carbon is in the cis position to the group in the chair form for the -anomer of D-mannose.
An extremely stable conformation without torsional strain is thought to exist in the chair form of cyclohexane, D-mannose.
Each C-C bond in the six-membered ring that makes up the chair structure is spaced out differently. Mannose is a C2 epimer of glucose and belongs to the aldohexose family of carbohydrates.
D and L-mannose will be mirror images of one another because they are enantiomers. D-mannose will consequently have a structure that is identical to L-mannose.
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irregular shaped white piece with dull luster has a hardness of 3 and fizzes when placed in weak hydrochloric acid
Answers
When placed in mild hydrochloric acid, carbonate, an irregularly shaped white chunk with a poor sheen and a hardness of 3, fizzes in three directions with perfect rhombohedral cleavage.
What are hydrochloric acids used for?Hydrogen chloride (HCl) is often used as a bleaching agent to neutralise alkaline compounds in the food, textile, metal, and rubber industries. It is neutralised when released into the soil, and it hydrolyzes quickly when it comes into contact with water. hydrochloric acid, sometimes known as muriatic acid, is an aqueous solution of hydrogen chloride. It is colourless and has an unmistakable pungent odour.
How can I increase my hydrochloric acid naturally?You can consume more hyaluronic acid by include bone broth in your diet. Additionally, consuming foods like soy products, oranges, almonds, kale, and sweet potatoes may naturally increase your body's production of hyaluronic acid because they contain nutrients. Lemons' high levels of acid encourage the creation of hydrochloric acid, which facilitates better digestion. Lemons assist your body break down the nutrients it needs and slow down meal absorption. The water also boosts your hydration, which keeps your body functioning properly.
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Calculate the volume of gas, in L, occupied by 1.74 moles of SF6 (g) at 273 K and 1 atm
Answers
The volume of gas is 3,949.31 litre, occupied by 1.74 moles of SF6 (g) at 273 K and 1 atm.
What is an ideal gas law ?The ideal gas law is also called as perfect gas law. It is the relation between the pressure P, volume V, and temperature T of a gas.
Given:
Volume of gas = ?
Number of moles (n) = 1.74 moles
Temperature (T) = 273K
Pressure (P) = 1 atm
R (gas constant) = 8.314
By an ideal gas equation
PV = nRT
By putting above value in ideal gas equation, we get
1 × V = 1.74 × 8.314 × 273
V = 3,949.31 litre
Thus, The volume of gas, in L is 3,949.31 litre, occupied by 1.74 moles of SF6 (g) at 273 K and 1 atm.
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How many molecuses are in 2.3 mole of carbon dioxide?
Answers
energy released as a gas changes to a liquid?
Answers
As a gas condenses to a liquid it releases the thermal energy it absorbed to become a gas. During this process the temperature of the substance does not change.
What is energy changes?
Energy changes is the process of changing energy from one form to another.
Energy is used to break bonds in reactants and energy is released when new bonds form in products. Energy may change form during a chemical reaction but the same amount of energy remains after the reaction as before. The law of conservation of energy states that matter cannot be created or destroyed.
Therefore, the conversion of one form of energy into another is energy changes.
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A gas at STP has a volume of 37.8 L. If the temperature is raised to 295 K and the pressure is changed to 50.0 kPa, what is the new volume of the gas?
Answers
When a gas at a given temperature and pressure is changed, the new volume of the gas can be calculated using the ideal gas law.
What is the new volume of the gas?The ideal gas law states that PV = nRT, where P is pressure, V is volume, n is the number of moles of gas, R is the ideal gas constant, and T is temperature.Given the temperature and pressure of the gas, we can rearrange the ideal gas law to solve for V: V = nRT / P. In this equation, n and R are constants. Since the new temperature and pressure are given, we can calculate the new volume of the gas:V = nRT / PV = (n)(0.08206 L•atm/mol•K)(295 K) / (50.0 kPa)V = 45.49 L Therefore, the new volume of the gas at 295 K and 50.0 kPa is 45.49 L, which is an increase of 7.7 L from the original volume of 37.8 L at STP. This is due to the fact that when the temperature and pressure of a gas are increased, the volume of the gas increases as well.To learn more about the ideal gas law refer to:
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Once the two atoms are bonded together, can you move the two atoms as a pair?
Answers
Yes, you can move the two atoms as a pair. This is because the bond between them is a covalent bond,
What is covalent bond?
A covalent bond is a type of chemical bond that involves the sharing of one or more pairs of electrons between two atoms. In a covalent bond, the atoms are held together by the attractive forces between the atoms’ shared electrons.
Covalent bonds are much stronger than ionic bonds, and occur between atoms in the same or different molecules. Examples of covalent bonds include the bonds between oxygen and hydrogen in water molecules and the bonds between carbon atoms in diamond.
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