Answer:
Ice has a very different structure than liquid water
Explanation:
the lattice arrangement allows water molecules to be more spread out than in a liquid, and, thus, ice is less dense than water.
Answer:
Ice has a different structure than water, they align themselves in a regular lattice rather than completely random in a liquid. The orientation of hydrogen bonds cause molecules to push farther apart, which lowers the density.
How many atoms are in 55g of H2SO4?
3.4 atoms
2.58 atoms
04.14 atoms
98.1 atoms
Answer: 3.4 atoms
Explanation: hope this helps you!!
What best describes the dropping height of a ball that bounced back up to a height of 45 centimeters?
Less than 45 centimeters, as the ball transforms some of its thermal energy into potential energy
Greater than 45 centimeters, as the ball transforms some of its thermal energy into potential energy
Less than 45 centimeters, as the ball transforms some of its potential energy into thermal energy and sound energy
Greater than 45 centimeters, as the ball transforms some of its potential energy into thermal energy and sound energy
Answer:
less than 45 cm, as the ball transforms some of its potential eneregy to termal energy and sound energy
You found that the unknown metal has a specific heat capacity close to, for example, that of silver [c=234J/(kg⋅K)]. Let's compare silver to other known materials and see whether your results make sense. Imagine you have 1 kg of each of the substances listed below. If the same amount of heat Q is added to each, which substance will undergo the largest change in temperature ΔT? Assume that no substance experiences a phase change. Rank the samples from largest to smallest change in temperature.
a. c= silver/ 234J(kg/K)
b. c= water/ 4190 J(kg/K)
c. c= glass/ 754J/(kg.K)
Answer:
a. c= silver/ 234J(kg/K) > b. c= water/ 4190 J(kg/K) > c. c= glass/ 754J/(kg.K)
Explanation:
Hello.
In this case, since the heat resulting from the temperature change for an specified amount of a substance is defined via:
[tex]Q=mCp\Delta T[/tex]
Since the specific heat is related to amount of energy required to raise the temperature of 1 kg of a substance by 1 °C, we can infer that the higher the specific heat, the higher the required energy as they are in a directly proportional relationship. Moreover, since the specific heat and the change in temperature are in an inversely proportional relationship, we can infer that the higher the specific heat, the lower the temperature change, therefore, we can rank the substances follows:
a. c= silver/ 234J(kg/K) > b. c= water/ 4190 J(kg/K) > c. c= glass/ 754J/(kg.K)
It means that silver will produce the largest temperature change, next water and finally glass since silver has the smallest specific heat next water and finally glass.
Best regards.
Alcohol and water are best separated from one another by
Answer:
fractional distillation
Explanation:
Use the hypothetical atom drawings (A-F) below to answer the next four questions. Note there is only one correct choice for each question and each choice is only used once. a.Which shows the absorption of violet light? Explain your reasoning.b.Which shows the emission of blue light? Explain your reasoning.c.Which shows the absorption of green light? Explain your reasoning.d.Which the emission of orange light? Explain your reasoning.e.Which shows an electron being ejected from the atom?
Answer:
a) D
b) C
c) B
d)E
e)A
Explanation:
For clarity, I have attached the images of the transitions to aid understanding.
The visible spectrum consists of Red, Orange, Orange,Yellow Green, Blue,Indigo,Violet. The magnitude of the wavelength of each decreases from left to right in that order. This implies that the red portion of the spectrum is less energetic than the violet portion because energy of a photon increases with decreasing wavelength.
D corresponds to the violet region because the energy difference between the two energy levels is high and requires the absorption of short wavelength, high energy photons of light.
In (b), image C represents an emission that involves a shorter wavelength and can only correspond to blue since it is from a energy level n=3 to n=1
In image (c) , green light is intermediate in energy and will correspond to image B because image F reflects a transition that occurs at a longer wavelength since the energy levels are close together.
In (d) orange light is found at the far, long wavelength portion of the spectrum hence it may involve an n=4 to n=2 transition.
A represents the ionization of the atom, the electron is finally lost from the atom.
Which of these is an example of a physical change?
A banana ripening in the air
Hydrogen burning in the air
Zinc reacting with an acid
Liquid water turning into vapor
Answer:
Liquid water turning into vapour.
Explanation:
Just the matter changes from one stage to another...
Answer:
D. liquid water turning into vapor
Explanation:
Correct on Edge 2022!!!
Good luck everyone, you got this! Have a great day!
What is the image point of (8,-2) after a translation right 5 units and up 2 units?
Daniel Harris has always enjoyed eating tuna fish. Unfortunately, a study of the mercury content of canned tuna in 2010 found that chunk white tuna contains 0.6 ppm Hg and chunk light tuna contains 0.14 ppm.2 The U.S. Environmental Protection Agency (EPA) recommends no more than 0.1 μg Hg/kg body weight per day. A person weighs 63 kg . How often may the person eat a can containing 6 ounces (16 oz=1 lb) of chunk white tuna so that they do not average more than 0.1 μg Hg/kg body weight per day?
А The person can consume one 6 oz can of chunk white tuna every_______ days.
If the person switches to chunk light tuna, how often can they eat one can?
The person can consume one 6 oz can of chunk light tuna every_______ days.
From the information given:
In 2010, the mercury content of:
The mass of chunk white tuna = 0.6 ppm The mass of a chunk of light tuna = 0.14 ppmweight of the body = 63 kgmass of the tuna = 6 ozIt is recommended that the maximum amount of mercury consumed by the body should not be more than 0.1 micrograms per day.
To determine how often may the person eat a can containing 6 ounces of chunk white tuna, we need to go through the following processes:
First, let convert the mass of the tuna to grams
Since 1 oz = 28.3495 g
Mass of the tuna = 6 oz × 28.3495 g
= 170.097 g
The maximum amount of mercury (Hg) permitted to be consumed by a 63 kg body weight in a day = 63 × 0.1
= 6.3 micrograms/day
However, the mass of the mercury (Hg) = concentration (Hg) × mass of tuna
= 0.6 × 10⁻⁶ × 170.097 g
= 1.0206 × 10⁻⁴ g
= 102.06 μg (micrograms)
Thus, the time required between the consumption of one 6 oz can of chunk white tuna is:
[tex]=\mathbf{ \dfrac{102.06}{6.3}}[/tex]
= 16.2 days
≅ 16 days
The time required between the consumption of one 6 oz can of chunk white tuna is approximately every 16 days.
To determine how often may the person eat a can containing 6 ounces of chunk light tuna, we need to go through the following processes:
However;
the mass of the mercury (Hg) = concentration (Hg) × mass of tuna
= 0.14 × 10⁻⁶ × 170.097 g
= 2.4814 × 10⁻⁵ g
= 23.814 μg
Thus, the time required between the consumption of one 6 oz can of chunk white tune is:
[tex]=\mathbf{ \dfrac{23.814}{6.3}}[/tex]
= 3.78days
≅ 4 days
The time required between the consumption of one 6 oz can of chunk light tuna is approximately every 4 days.
Therefore, we can conclude that the time required between the consumption of one 6 oz can of chunk white tuna is approximately every 16 days and the time required between the consumption of one 6 oz can of chunk light tuna is approximately every 4 days.
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Under what categories of cells would the animal and plant cell fall
As an apple falls from a tree, which types of energy are changing?
Group of answer choices
Elastic energy and sound energy
Light energy and gravitational potential energy
Kinetic energy and nuclear energy
Gravitational potential energy and kinetic energy
household items that are substance or mixture
Oil and water.
Lemon juice and tea.
Honey and tea.
Milk and chocolate.
Coffee and cream.
Cream and sugar.
Flour and butter.
Cereal and milk.
Answer:
oil ,water lemon juice and tea coffee an cream honey and tea milk and chocolate these are mixtures
The first reaction in the Ostwald process for the production of nitric acid involves the combustion of ammonia
4NH3(g)+5O2(g)=4NO(g)+6H2O(g)
a) Estimate ΔH^o (in kJ) for this reaction using average bond energies.
b) Calculate ΔH^o (in kJ) for this reaction using standard heats of formation.
c) Briefly explain why the value for ΔH^o, calculated using average bond energies, is only considered to be an estimate of the standard enthalpy change for the reaction
Answer:
Explanation:
Given that;
The chemical equation for the reaction is:
[tex]\text {4NH}_3(g) +\text {5O}_2(g) }[/tex] ↔ [tex]\text {4NO}(g) +\text {6H}_2O}(g) }[/tex]
a). [tex]\Delta H^0 = \sum \Delta H^0_{reactant \ bonds \ broken} + \sum \Delta H^0_{product \ bonds \ formed}[/tex]
Using average bond energies;
For Bonds broken, we have:
4 × 3 N - H = 12 mol × 391 kJ/mol = 4692 kJ
5 × O = O = 5 mol × 498 kJ/mol = 2490 kJ
[tex]\mathbf{ \sum \Delta H^0_{reactant \ bonds \ broken} }[/tex] = 7182 kJ
For Bonds formed, we have:
4 × N = O = 4 mol × - 607 kJ/mol = -2428 kJ
6 × 2 O - H = 12 mol × - 467 kJ/mol = - 5604 kJ
[tex]\mathbf{ \sum \Delta H^0_{product \ bonds \ formed} }[/tex] = - 8032 kJ
Therefore;
[tex]\mathbf{ \Delta H^o = 7182 kJ + (- 8032 \ kJ)}[/tex]
[tex]\mathbf{ \Delta H^o =-850 \ kJ}[/tex]
b) Using Standard heats of formation;
[tex]\Delta H^0 = \sum m \Delta H^0_f (products) = \sum n \Delta H^0_f (reactants)[/tex]
[tex]\Delta H^0 = [ 4 \ mol \times \Delta H^0_f \ (NO(g)) + 6\ mol \times \Delta H^0_f(H_2O)] - [ 4 \ mol \times \Delta H^0_f \ (NH_3(g)) + 5 \ mol \times \Delta H^0_f \ (O_2)][/tex]
[tex]\Delta H^0 = [ 4 \ mol \times90.29 \ kJ/mol + 6\ mol \times -241.826 \ kJ/mol - [ 4 \ mol \times-45.9 \ kJ/mol + 5 \ mol \times 0][/tex]
[tex]\mathbf{\Delta H^0 = -906.196 \ kJ}[/tex]
c) The value of ΔH^o, calculated using average bond energies, is only considered to be an estimate of the standard enthalpy change for the reaction because there is a premise in the calculation that all the bonds broken in the reactant and all bonds are formed in products. Meanwhile, only little bonds are broken, and only little bonds are formed during the reaction.
Which scientific term names rocks formed from magma?
A. Intrusive
B. Lava
C. Gabbro
D. Extrusive
Answer:
A Intrusive
Explanation:
I go to K12 and they say that's the answer
how to synthesize N-methylpropanamide with a acid anhydride
Answer:
See attached picture.
Explanation:
Hello.
In this case, since the synthesis of amides via anhydride requires its reaction with the N-radical primary amine, as it is required to yield N-methylpropanamide, the reactants must be propanoic anhydride and methylamine in order to yield the aforementioned amide as well as propanoic acid as a side product.
This reaction is shown on the attached picture.
Best regards.
gr
12. I want to group items together that are a like in some way.
This is called
12
Answer:
it's called cassification?
_____ CH 4 + _____ O 2_____ CO 2+ H 2 O
Answer:
Carbon dioxide and oxygen
Explanation:
Describe how you could use the Beer's Law simulation to experimentally determine the best wavelength at which to perform an experiment
A. Measure the absorbance for solutions of multiple different solutes and find the minimum absorbance.
B. Measure the absorbance for solutions with different concentrations and find the slope of the trendline.
C. Measure the absorbance for the same solution at different wavelengths and find the maximum absorbance.
D. Measure the absorbance for the same solution in different cuvette sizes and find the y-intercept.
Answer:
Measure the absorbance for the same solution at different wavelengths and find the maximum absorbance.
Explanation:
To obtain the wavelength of maximum absorption, many different wavelengths must be passed through a solution and the corresponding absorption is measured for each wavelength.
The wavelength at which the maximum absorption occurs is known as the wavelength of maximum absorption. This is the wavelength st which the experiment should be performed.
1. Which of these is always evidence of a chemical change?
A. Formation of bubbles
B. Temperature change
C. Change in color
D. Formation of a precipitate
Answer:
Explanation:
i guess change in colour
What is the predominant intermolecular force in the liquid state of each of these compounds: methanol (CH3OH), carbon tetrafluoride (CF4), and hydrogen chloride (HCl)?
Answer:
Throughout the liquid state, certain forces are encountered by the aforementioned molecules:
Explanation:
CH₃OH: Combining with hydrogen. That's also since O is a very electronegative atom here between O as well as H including its molecule. These powers, with H, propagate between O, F as well as N. That's the main power, then.CF₄: F will establish hydrogen bonds, but it is not bound to H in this situation, so this may not be the primary power. Throughout this situation, owing to its tetrahedral structure, it does not have a net dipole. It then just has dispersion powers, which are sometimes referred to as van der Waals either London forces. HCl: powers of dipole-dipole as well as London dispersion.Which statement is correct about a sample of liquid water
The molecules in ice and liquid water have the same kinetic energy. Liquid water has a greater entropy than ice and the liquid water has a greater potential energy than ice. The correct option is D.
What is kinetic energy?Kinetic energy is the energy that an object or particulate has as a result of its motion.
When work, which converts energy, is performed on an object by applying a net force, the object accelerates and gains kinetic energy.
Potential energy is the energy that an object has as a result of its location in relation to other objects.
Potential energy is frequently associated with restoring forces such as a spring or gravity.
Ice and liquid water molecules have the very same kinetic energy. Liquid water has more entropy than ice, and it also has more potential energy than ice.
The correct answer is D.
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Your question seems incomplete, the complete question may be:
Correct statements about samples of ice and liquid water at 0∘ C include which of the following ?
(P) Molecules in ice and liquid water have the same kinetic energy.
(Q) Liquid water has a greater entropy than ice.
(R ) Liquid water has a greater potential energy than ice
A. P and Q onlyB. P and R onlyC. Q and R onlyD. P,Q and RCopper has a density of 8.96 g/cm3. What is the mass of a piece of copper with a volume of 2.62 cm3?
Answer:
The answer is 23.48 gExplanation:
The mass of a substance when given the density and volume can be found by using the formula
mass = Density × volumeFrom the question
volume of copper = 2.62 cm³
density = 8.96 g/cm³
We have
mass = 8.96 × 2.62 = 23.4752
We have the final answer as
23.48 gHope this helps you
two substances in a mixture differ in density and particle size. These properties can be used to
Answer:
(1) separate the substances
(2) chemically combine the substances
(3) determine the freezing point of the mixture
(4) predict the electrical conductivity of the mixture
Explanation:
Answer: I think the best answer from the choices listed above is option 1. Two substances in a mixture differ in density and particle size. These properties can be used to separate the substances. These properties can be manipulated in order to have a better separation between the two substances.
Knowing that the distances the truck traveled during each segment were 30, 45, 50, and 65 respectively, what was the total distance traveled by the truck?
Answer:
The distance the truck traveled is 190
Explanation:
I added 30, 45, 50, 65 together to get the total distance
A gas cylinder with a volume of 12.5 L contains 36.3 g of gas. What is the density of the gas?
Density = Blank g/L
Answer:
The answer is 2.90 g/LExplanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\[/tex]
From the question
mass = 36.3 g
volume = 12.5 L
We have
[tex]density = \frac{36.3}{12.5} \\ = 2.904[/tex]
We have the final answer as
2.90 g/LHope this helps you
What is the process that occurs when repeated freezing and thawing breaks apart rocks?
A- Erosion
B-Deposition
C-Physical Weathering
D- Chemical Weathering
11 POINTS!!!!!!! HURRYYY! PLEASE
Answer:
c
Explanation:
Physical Weathering is process that occurs when repeated freezing and thawing breaks apart rocks
What is the chemical formula for the compound formed between chromium(III) and the bromate ion?
Answer:
The chemical formula is Cr(BrO3)3.
The chemical formula formed between chromium (III) and bromate ion is Cr(BrO3)2.
What is the chemical formula?A chemical formula is an formula for the atoms in compound which are arranged in a fixed proportion.
The chemical formula of salt is NaCl. The chemical formula of sodium bicarbonate is NaHCO3. The chemical formula of chromium bromate is Cr(BrO3)2.
The molecular mass of chromium bromate is 435. 7027. The valency of chromium in chromate ion is 2. The atomic number of chromium is 24. The atomic number of bromine is 35. Bromine contain seven valence electrons.
Therefore, The chemical formula formed between chromium (III) and bromate ion is Cr(BrO3)2.
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Two students are engaged in an argument about whether or not a plant can live independently inside of a sealed jar for up to two weeks by using energy from the sun and energy from the mitochondria to carry out all of its life processes.
Student A: The plant can live independent of other organisms such as animals, because it can obtain nutrients to grow, reproduce, make needed materials, and remove the waste on its own.
Student B: The plant only relies on other organisms, such as animals that produce the carbon dioxide needed to obtain nutrients to grow, reproduce, make needed materials, and remove waste.
Based on the diagram, which student's argument is BEST supported? Use evidence from the diagram to support your reasoning.
Answer:
where's the diagram?
Explanation:
the best answer is student A
What is the mass of Na?
2NaN3 2Na + 3N2
(500g) (?) (3235)
Options are 100 grams, 177 grams, 323 grams
Answer: 177
Explanation:
The reaction yields 177g of Na.
How to calculate the mass of Na?The balanced equation is
2NaN₃ → 2Na + 3N₂
Either use the mass of NaN₃ or of N₂ to calculate the mass of Na.
Using Mass of NaN₃By making the following conversions:
mass of NaN₃ → moles of NaN₃ → moles of Na → mass of Na
500 g NaN₃ × [tex]\frac{1 mol NaN_{3} }{65.01 g NaN_{3} }[/tex] = 7.69 mol NaN₃
7.69 mol NaN₃ × [tex]\frac{2 mol Na}{2 mol NaN_{3} }[/tex] = 7.69 mol Na
7.69 mol Na × [tex]\frac{22.99 g Na}{1 mol Na}[/tex] = 176.8 g Na = 177g of Na
Using Mass of N₂By making the following conversions:
mass of N₂ → moles of N₂ → moles of Na → mass of Na
323.20 g Na ×[tex]\frac{2 mol N_{2} }{28.01 g N_{2} }[/tex] = 11.539 mol N₂
11.539 mol N₂ × [tex]\frac{2 mol Na}{3 mol N_{2} }[/tex] = 7.692 mol Na
7.692 mol Na × [tex]\frac{22.99 g Na}{1 mol Na}[/tex] = 176.85 g Na = 177g of Na
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Propose structures that meet the following descriptions. Use bond-line notation to draw your structural formulas. a. ketone with five carbons and one alcohol c. alkane (no double bonds) with the formula, C6H12 e. nitrile with the formula, C5H9N g. phenol with a carboxylic acid group adjacent to hydroxyl i. amide with the formula, C3H7NO k. a secondary thiol with 3 carbons m. a primary alcohol with five carbons b. a-ketoester (i.e., a molecule with a ketone one carbon away from an ester) d. dialdehyde with the formula, C4H6O2 f. b-ketocarboxylic acid (i.e. a molecule with a ketone two carbons away from a carboxylic acid) h. amino acid (i.e. a carbon atom attached to both a carboxylic acid and an amine j. ether with the formula, C4H10O l. alkane with five carbons, one of which is a quaternary carbon n. hydroxy aldehyde (a compound containing an aldehyde and hydroxy group)
Answer:
See explanation
Explanation:
In putting up prospective structures for the compounds, we must consider the tetra valency of carbon. Again you must read the description carefully before drawing each structure.
In each of the proposed structures, the number of atoms present must reflect the condensed structural formula given in the question.
Proposed structures for each chemical specie in the question are shown in the images attached.
Which is the best way to determine if an object is made of pure silver?
O Determine the solubility of the object.
O Test to see if the object is chemically reactive.
Determine the density of the object and compare the known density of pure silver.
O Compare the mass of the silver object to the mass of a piece of pure silver.
Answer:
C. Determine the density of the object and compare the known density of pure silver.
Explanation:
A pure silver is a chemical substance that comprises of 0.1% of trace elements and 99.9% of silver. It is also known as fine silver in chemistry.
Due to the fact that pure silver has a very high level of purity, it is usually too soft for jewelry making and as such it's mixed with other metals such as copper, nickel, zinc, palladium etc. so as to make it hard.
In Chemistry, the best way to determine if an object is made of pure silver is to determine the density of the object and compare the known density of pure silver. This can be done by properly weighing the object to determine its mass and then determining its volume by checking how much water is displaced when completely immersed. The respective values for mass and volume of the object is then used to calculate its density.
Density can be defined as mass all over the volume of an object. Simply stated, density is mass per unit volume of an object.
Mathematically, density is given by the formula;
[tex]Density = \frac{mass}{volume}[/tex]
After determining the density of the object, it is then compared with the density of pure silver which is ideally 10.5g/cm³.