Answer:
The density of any given liquid is equivalent to the mass of the liquiddivided by the volume of the liquid.From the given information, we have:The mass of the unknown liquid to be = 972 gThe volume of the unknown liquid to be = 0.610 L = 610 cm³If the formula for calculating Then;The Density of the unknown liquid ≅ 1.593 g/cm³In conclusion, the density of the unknown liquid is 1.593 g/cm³ to 3 significant figures.
Explanation:
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Why has the atom model changed over time?
The atomic model changes over time because the atomic model was based on theories and discoveries.
Because the atomic model was built on theories and observations, it evolves with time. The atomic model was altered as a result of our false assumptions about the atomic form being shown through experiments to be made up of even smaller particles.
Bohr's and Rutherford's models of the atom were the two main ones. The model evolved over time when electrons, protons, neutrons, orbitals, etc. were discovered.
To explain how electrons might form stable circles around the centre of a molecule, Bohr introduced his quantized shell model of the molecule in 1913. Radiation can occur simply when an electron jumps from one circle to the next.
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The image above shows the inner planets which plan is represented by the number two?
Answer:
Venus
Explanation:
From the sun outwards is Mercury Venus Earth and then Mars
The compound diborane (B2H6) was at one
time considered for use as rocket fuel. Its
combustion reaction is B2H6(g) + 3 O2(ℓ) → 2 HBO2(g) + 2 H2O(ℓ)
The fact that HBO2, a reactive compound,
was produced rather than the relatively inert
B2O3 was a factor in the discontinuation of
the investigation of the diborane as a fuel.
What mass of liquid oxygen (LOX) would be
needed to burn 134.8 g of B2H6?
The mass of liquid oxygen needed to burn 134.8 g of B2H6 is 84.41 mL LOX.
What is liquid oxygen?Liquid oxygen is a form of oxygen in its liquid state. It is a colorless, odorless, and highly reactive substance that is composed of two oxygen atoms bonded together. It can be made by cooling oxygen gas in a cryogenic process to temperatures below -297°F (-183°C).
The combustion reaction of diborane requires 3 moles of oxygen for every 1 mole of diborane, so the mass of oxygen required to burn 134.8 g of B2H6 (1 mole) is:
3 moles of O₂ x (32.00 g/mol O₂) = 96.00 g of O₂
Since liquid oxygen (LOX) has a density of 1.141 g/mL, the mass of liquid oxygen needed to burn 134.8 g of B2H6 is:
96.00 g O₂ ÷ 1.141 g/mL = 84.41 mL LOX
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HELP ASAP
If a steel nail is wrapped 8 times with an insulated copper wire and each end of is attached to a 1.5 V single-A battery we find that it will lift the weight of 2 paper clips. Hypothesis: If 8 more coils are added to the nail we will be able to pick up twice as many paper clips. When we ran the experiment, we observed and recorded that when we added 8 more wraps around the nail (16 coils) we could lift 4 paper clips and when we added 8 more wraps (24 coils) we could lift 6 paper clips. Which of the following is/are true?
I. Something went wrong with the experiment since it didn't give us the results we expected.
II. The hypothesis was supported with the results of the experiment.
III. It can be concluded that every time 8 wraps are added to the nail, the total number of paper clips lifted doubles.
II and III only
II only
I only
I and III only
Based on the relationship between the number of turns of the coils and the strength of an electromagnet, the true options are:
The hypothesis was supported by the results of the experiment:
The correct option is II only.
What is the relationship between the number of turns of the coils and the strength of an electromagnet?The strength of the electromagnet rises with the number of turns in the coil.
This is due to the fact that as the coil "cuts" through the magnetic field, the sum of the individual emf s created by each turn increases with the number of coils turns.
The relative speed between the coil and magnet, as well as the magnet's strength, are additional elements that influence the strength of the induced current in a dynamo in addition to the number of coils. The intensity of the generated current increases with magnet strength and relative speed.
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I jus need help w my science stuff☠️
Answer:
Explanation:
Sound energy: Crowd cheering
Chemical energy: Body converts nutrients into energy to run
Mechanical energy: The camera filming the photo
What is the value of H-C-H bond angle in ethylene?
The value of the H-C-H bond angle in ethylene is 117°.
The bond angle is a geometric angle that is formed due to the repulsion between atoms or electrons in a bond. The binding angle for a linear molecule is 180°, for a triangular planar molecule it is 120°, and so on.
The size of the bond angle is affected by the magnitude of the repulsive force of electron pairs in the molecule. The lone pair has a slightly stronger repulsive force than the bonding pair. This happens because the lone pair of electrons is only bound to one atom, so the movement is more flexible.
Determine the bond angles using VESPR theory, such as if the shape of the molecule AX means that it is linear with a bond angle of 180 degrees.
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Consider the given plot of absorbance vs. concentration. Which line is the best-fit line to represent the black data points? Absorbance А B 1 0.9 0.8 С 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 0.1 0.5 0.6 0.2 0.3 0.4 Concentration Select one: Blue line (C) O Green line (A
For the given plot of absorbance vs Concentration, the purple line is the best-suited line to characterize the black statistics points.
What is Concentration?In chemistry, concentration refers to the amount of a substance in a defined space. Another definition is that concentration is the ratio of solute in a solution to either solvent or total solution. Concentration is usually expressed in terms of mass per unit volume. However, the solute concentration may also be expressed in moles or units of volume. Instead of volume, concentration may be per unit mass. While usually applied to chemical solutions, concentration may be calculated for any mixture.Two related terms are concentrated and dilute. Concentrated refers to chemical solutions that have high concentrations of a large amount of solute in the solution. If a solution is concentrated to the point where no more solute will dissolve in the solvent, it is said to be saturated. Dilute solutions contain a small amount of solute compared with the amount of solvent.In order to concentrate a solution, either more solute particles must be added or some solvent must be removed. If the solvent is nonvolatile, a solution may be concentrated by evaporating or boiling off solvent.
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how many orbitals are in the 3rd principal energy level
The number of orbital in the third principal energy level nine.
What is principal energy level?
Principal energy level is a space that divide nucleus atom into a region with a certain levels. each of them has one sub level that contain only one s- orbital. In the s- orbital, the total electron available is 2 and determine as the lowest level because it is contain the lowest electrons. Each principal energy level after first energy level has one s- orbital with 3 p-orbital. Hence the third principal energy level contain 1 s- orbital, 3 p-orbital and 5 d-orbital or 1 + 3 + 5 total orbital. So, the total orbital of this level is 9.
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Determine the correct answers to the problems below and round to the required number of significant figures.
Enter your answer in standard notation.
0.004911/3.87 =
4 x 6 =
When rounding to a significant figure, look at the first non-zero digit if doing so to one. If rounding to two significant figures, look at the digit following the first non-zero digit.
Between any two non-zero digits, all zeros are important. Seven significant digits are seen in, for instance, 108.0097. There is never any significance for any zeros that are both to the right and left of the decimal point and a digit that is not zero. As an illustration, 0.00798 has three significant digits. The zeros in between two non-zero digits ARE important. Leading zeros have no relevance. The trailing zeros to the right of the decimal point ARE important. A full number's trailing zeros when represented by a decimal are important.
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(A)should have three significant figures, as the lowest number of significant figures is always correct. 0.004911/3.87 = 0.001268 = 0.00127 = 1.27(10)-3. (B) 4*6 has two significant numbers of 1, and 24 rounds to 20 to equal 2(10)1.
The significant figures of a number are the important or critical digits that correctly convey the meaning of that number. For instance, the number 6.658 has four significant digits. The statistics' precision comes from these enormous sums. They are sometimes referred to as significant digits. Significant figures, also known as the significant digits, accuracy, or resolution, are the digits in a number that are reliable and necessary to indicate the quantity of anything in positional notation. If a number indicating the result of a measurement has more digits than the number of digits permitted by the measurement resolution, only the digits allowed by the measurement resolution are reliable, and only these can thus be relevant figures.
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(part 1 of 2)
Hydrogen and oxygen react under a specific
set of conditions to produce water according
to the equation
2 H2(g) + O2(g) −→ 2 H2O(g).
How much hydrogen would be required to
produce 7.5 mol of water?
Answer in units of mol. Answer in units of
mol.
(part 2 of 2)
How much oxygen would be required?
Answer in units of mol. Answer in units of
mol.
Answer: part 1 of 2
1. The amount required of H₂ = 11.0 g.
2. The amount required of O₂ = 88.0 g.
Explanation:
The balanced equation for the mentioned reaction is:
2H₂(g) + O₂(g) → 2H₂O,
It is clear that 2.0 moles of H₂ react with 1.0 mole of O₂ to produce 2.0 moles of H₂O.
Q1: How much hydrogen would be required to produce 5.5 mol of water?
Using cross multiplication:
2.0 mol of H₂ produce → 2.0 mol of H₂O, from stichiometry.
??? mol of H₂ produce → 5.5 mol of H₂O.
∴ the no. of moles of H₂ needed to produce 5.5 mol of water = (2.0 mol)(5.5 mol)/(2.0 mol) = 5.5 mol.
Now, we can get the mass of H₂ needed to to produce 5.5 mol of water:
mass of H₂ = (no. of moles)(molar mass) = (5.5 mol)(2.0 g/mol) = 11.0 g.
Q2: How much oxygen would be required?
Using cross multiplication:
1.0 mol of O₂ produce → 2.0 mol of H₂O, from stichiometry.
??? mol of O₂ produce → 5.5 mol of H₂O.
∴ the no. of moles of O₂ needed to produce 5.5 mol of water = (1.0 mol)(5.5 mol)/(2.0 mol) = 2.75 mol.
Now, we can get the mass of O₂ needed to to produce 5.5 mol of water:
mass of O₂ = (no. of moles)(molar mass) = (2.75 mol)(32.0 g/mol) = 88.0 g.
How would you make it a supersaturated solution of sodium acetate in water?
175 g of sodium acetate trihydrate and 50 mL of distilled water (3.5 g NaC2H3O2. 3H2O per mL H2O) are combined to create the supersaturated solution. The mixture is then heated in a water bath while being occasionally stirred to create a clear, uniform solution.
How to prepare a supersaturated solution?To make a supersaturated solution of sodium acetate in water, you would need to dissolve more sodium acetate in the water than would normally be possible at a given temperature. This can be achieved by heating the water to a temperature at which more sodium acetate can be dissolved, and then slowly adding the sodium acetate while stirring until no more will dissolve. Once the desired concentration of sodium acetate is reached, the solution should be cooled to room temperature or below, which will cause the excess sodium acetate to come out of solution and form crystals.
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beryllium and iodine
Express your answer as a chemical formula.
Answer: Aberham Lincon was an basketball player for the brick walls and then got traded to the wasthiton bottle caps then I will go to the bus stop
Explanation:
give the product of the bimolecular elimination from each of the isomeric halogenated compounds.
An example of the bimolecular elimination from the isomeric halogenated compound would be of Dehalogenation of 1,2-dibromoethane to form ethene and hydrogen bromide: H3C-CH2-Br2 --> H2C=CH2 + HBr.
Bimolecular elimination is a chemical reaction where two molecules react to form a new molecule and a neutral molecule. Isomeric halogenated compounds are compounds that have the same molecular formula but different structural arrangements.
For example, 1,2-dibromoethane and 1-bromo-2-chloroethane are isomers. Bimolecular elimination of these compounds can produce ethene and hydrogen halide (HBr or HCl) as the products. The specific product will depend on the isomeric halogenated compound and the reaction conditions.
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Show work worth
Show work 10 points
Particle of Cu that Johnny produce is 2.7521 x 10²³ particles
A substance's mole is equivalent to 6.022 × 10²³ of that material (such as atoms, molecules, or ions). The term "Avogadro's number" or "Avogadro's constant" refers to the number 6.022 × 10²³.
To calculate the number of particles, first we Should calculate the moles of Cu
Moles of Cu = mass / mass molar
Moles of Cu = 29.02 g / 63.5 g/mole
Moles of Cu = 0.457 moles
The we can calculate the particle Cu that johnny produce
Particle Cu = moles x avogadro's number
Particles Cu = 0.457 moles x 6.022 x 10²³
Particles of Cu = 2.7521 x 10²³ particles
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Quincy uses the quadratic formula to solve for the values of x in a quadratic equation. He finds the solution, in simplest radical form, to be x = startfraction negative 3 plus or minus startroot negative 19 endroot over 2 endfraction. Which best describes how many real number solutions the equation has?.
x = [-b (b2 - 4ac)]/2a is the solution to the quadratic equation ax2 + bx + c = 0. By using the plus and minus symbols in this formula, we are able to determine the two values of x. In light of this, there are two plausible values for x: [-b + (b2 - 4ac)]/2a and [-b - (b2 - 4ac)]/2a.
Which equation has all real numbers as solutions?The simplest definition of a real solution in algebra is a solution to an equation that is a real number.
ax2 + bx + c = 0 is the quadratic equation's conventional form.
Since the discriminant is negative, the equation has zero real number solutions in its simplest radical form.
A linear equation is an identity if it can be solved by finding the solution to a true assertion, such as 0 = 0. All real numbers make up its solution set.
On both sides of the equation, combine like terms. Subtract x from both sides to isolate the x word. You reach the correct result, "3 Equals 3." It indicates that the equation's answer when you arrive at a true statement like this.
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Under what conditions is the ideal gas assumption suitable for real gases select all that apply?
The ideal gas law is a powerful tool for predicting the behavior of gases under a variety of conditions.
According to the ideal gas law, gases will behave most like an ideal gas when they are at low pressures and high temperatures.
This means that when the pressure is low and the temperature is high, the molecules of the gas will have more space to move around and they will have higher average speeds.
Under these ideal conditions, the gas will behave according to the predictions of the ideal gas law.
Additionally, the gas particles must be small and non-interacting, meaning that they do not interact with each other. When these factors are taken into account, a gas will most likely display the ideal gas properties predicted by the ideal gas law.
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The atomic mass unit is equivalent to 112 of the mass of a neutral atom of which element?
Answer: carbon element
Explanation:
this is it
Which is a distinction between an epidemic and a pandemic?
A.
the species of organisms infected
B.
the geographical area affected
C.
the symptoms of the disease
D.
the season in which the disease spreads
Answer:
B.
a pandemic would be like COVID-19 as it spread world wide
a epidemic would be like Japanese small pox incident because it was mostly in Japan
(1) Draw all significant resonance structures of cycloserine. In step 1 draw the resonance form that forms a carbocation next to the oxygen. Include lone pairs and charges in your structure.
(2) In step 2 draw the resulting resonance structure. Include lone pairs and charges in your structure.
Resonance structures of cycloserine can be produced with the help of rotating arrows, produced with a carbocation in step 1 and the resultant resonance structure in step 2 after the double faced arrow.
An antibiotic called cycloserine was discovered in the bacterium Streptomyces orchidaceous. When treating tuberculosis, it is used with other medications. To depict the motion of the electrons in the "original" resonance structure, use curved arrows. By following the arrows, the "new" resonance structure should be a "product" that is automatically created. It will have two resonance structures as depicted in the image attached. Carbocation produced is the step 1 and the resultant compound is the step 2 in the image.
Resonance structures are collections of Lewis structures that explain how the electrons in a polyatomic ion or molecule become delocalized. Because molecules and polyatomic ions frequently have partial charges and fractional bonds, a single Lewis structure frequently falls short of explaining the bonding in a molecule or polyatomic ion.
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What is the total pressure exerted by a mixture containing two gases if the partial pressure of one gas is 70 kPa and the partial
pressure of the other gas is 30 kPa?
A) 70 kPa
B) 40 kPa
100 kPa
D) 30 kPa
Answer:
C) 100 kPa
The total pressure exerted by a mixture of gases is equal to the sum of the partial pressures of each individual gas. In this case, the partial pressure of the first gas is 70 kPa and the partial pressure of the second gas is 30 kPa. Therefore, the total pressure exerted by the mixture is 70 kPa + 30 kPa = 100 kPa. The answer is C) 100 kPa.
Explanation:
A battery contains two metals that have different tendencies to attract electrons. If one is lithium with an electron affinity of −3.05, and the other is zinc with an electron affinity of −0.76, describe how the electrons will flow. Then, describe how you could make this an even stronger battery.
This battery could be made stronger when we make lithium the anode and make zinc the cathode.
What is the electron affinity?We know that the term electron affinity has to do with the fact the a specie is able to attract electrons. Hence, the specie that can be able to attract electrons is said to be have a greater electron affinity.
If we look at the order of the reactivity of the metals, we can see that the lithium has more tendency to exist as a positive ion as such the electron affinity of the lithium atom is very negative and it does not attract electrons.
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Given 0.32 moles of H2O how many moles of H2 are needed
Answer:
0.32 moles of H2
Explanation:
I will assume the question concerns the production of water from hydrogen and oxygen(?). If theis is correct, start with a balanced chemical reaction.
O2 + 2H2 = 2H2O
2 O and 4 H on both sides of the reaction: it is balanced.
The balanced equation tells us we need 2 moles of H2 for every 2 moles of H2O, a 1:1 molar ratio. If we want 4 moles of H2O, we'd need 4 moles of H2.
If we want 0.32 moles of H2O, we need 0.32 moles of H2.
Movies | Aldah - Watch Free Movie.. GoStream 123m Watch Angeles In the laboratory a "coffee cup calorimeter or constant pressure calorimeter, is frequently used to determine the specific heat of a solid, or to measure the energy of a solution phase reaction Since the cup itself can absorb energy, a separate experiment is needed to determine the heat capacity of the calorimeter. This is known as calibrating the calorimeter and the value determined is called the calorimeter constant One way to do this is to use a common metal of known heat capacity. In the laboratory a student heats 95,37 grams of copper to 99.24 °C and then drops it into a cup containing 78.54 grams of water at 22.14 °C She measures the final temperature to be 29.85 °C Using the accepted value for the specific heat of copper (See the References tool), calculate the calorimeter constant Calorimeter Constant = 1°C NEC DOLL Priser sert
A student heats 95.37 grams of copper to 99.24 °C and then drops it into a cup containing 78.54 grams of water at 22.14 °C She measures the final temperature to be 29.85 °C . The calorimeter constant is 1°C.
Given that :
Mass of copper = 95.37 g
Heat capacity = 0.44 J/ g °C
Temperature = 99.24 °C
Final temperature = 29.85 °C
Q copper = m c × ΔT
= 95.37 × 0.44 × -69.39
= - 2773.8 J
Mass of water = 78.54 g
Heat capacity = 4.18 J/g °C
Q = 78.54 × 4.18 × 7.71
Q = 2787.6J
Q calorimeter = 13.8 J
Calorimeter constant = 13.8 J / 7.71 °C
= 1 °C
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Earth's gravity is not strong enough to overcome the moon's__
Answer: orbit?
Explanation:
What is DNA replication Mcq?
DNA replication is a process by which this protein is duplicated, that is, an identical copy is synthesized. Thus, from a single molecule of this complex compound, two or more replicas will be derived.
Why is DNA replication an important process?DNA is the basis of genetic material. Through this protein, information is passed from parents to children, which allows genetic sequencing.
It is precisely the replication of this complex protein that allows genetic information to be transmitted from a mother cell to daughter cells.
In DNA replication, the two complementary polymers of the original DNA, when separated, serve as a template for the synthesis of a new strand complementary to the original template strand.
Manufacture of proteins during the process of DNA replication.DNA replication begins in the individual when its first cells are formed in the embryonic stage and ends when the organism dies is what allows it to occur in the individual's genetic evolution, although genetic alterations can also occur on occasions due to unknown causes.
Through this process of transcription and translation that takes place in the cell, all the proteins that the organism needs for its functioning are made, which depends on the information stored in the DNA base sequences.
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Determine the correct sequence of trials. First Add HCl to water and measure pH Add HCl to buffers and measure pH Add NaOH to water and measure pH Make assigned buffer(s) Add NaOH to buffers and measure pH
In order for the unknown's absorbance to fall within the standard curve, dilute it. If the dilution procedure is documented, it is possible to calculate the full strength concentration after determining the diluted quantity.
The solution's strength is what.The solute content in grams dissolved per liter of the solution is used to determine the solution's strength. It serves as a gauge of the solution's potency or concentration. The unit of measurement is grams per liter.
Is focused the same as powerful?Strong acids are those that totally dissociate in an aqueous solution, while concentrated acids are those that have a high concentration of acid molecules per unit of mixture.
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Zn-66(atomic number 30) has
Zinc-66 with atomic number 30 has 30 protons, 36 neutrons and 30 electrons.
What is atomic number?The atomic number of an element is the number of protons in an atom of that element.
The atom of an element is made up of three subatomic particles namely; protons, neutrons and electrons.
Proton is the positively charged subatomic particle forming part of the nucleus of an atom and determining the atomic number of an element while electron is the subatomic particle having a negative charge and orbiting the nucleus.
Neutron, on the other hand, is the subatomic particle forming part of the nucleus of an atom and having no charge. It is got by subtracting the number of protons of an atom from the mass number.
According to this question, an atom of Zinc element is said to have a mass number of 66 and atomic number 30. This suggests that the zinc atom posseses the respective number of subatomic particles as illustrated in the main answer part.
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What foods, if any, only consist of one type of saccharide?
Answer: pears, oatmeal, green beans, corn, oranges, black beans,bananas, asparagus
Which of the following prevent watershed pollution?
options:
A: cutting down trees
B: flushing the toilet
C: picking up litter and pet waste
D: using a broom instead of a hose to clean sidewalks
Choose all that apply
Everyday, save water. Reduce the length of your showers, patch any leaks, and switch off the flow when you're not using it. Instead of disposing of hazardous household chemicals into the drain, transport them to the a hazardous waste facility. Use resilient plants in your yard that require little to no watering, fertilizer, or pesticides.
What three categories do pesticides fall under?Arthropods, including insects, are killed by insecticides. Mites can feed on both plants and animals are eliminated with miticides, also known as acaricides. Microorganisms known as microbial pesticides can kill, prevent, or outcompete pests like insects or even other microorganism pests.
Do pesticides harm people?Pesticides can have both acute, or short-term, negative health impacts, and chronic, or long-term, consequences, which can develop years or months after exposure. Examples of immediate health consequences include eye stinging, blisters, rashes, blindness, nausea, lightheadedness, diarrhea, and even death.
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Answer: The answer is : using a broom, and picking up litter and pet waste.
Explanation: I just took the test and got a 100%,! that was my answer.
Define in your own words energy transfer
Answer:
The conversion of one form of energy into another, or the movement of energy from one place to another.
Explanation:
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