Answer:
—MASS is the amount of matter that makes up something. - VOLUME _ is the amount of space that a material takes up.
Explanation:
Under what categories of cells would the animal and plant cell fall
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.
Alcohol and water are best separated from one another by
Answer:
fractional distillation
Explanation:
What is the image point of (8,-2) after a translation right 5 units and up 2 units?
What is the resistance of a circuit with 120 volts and 30 amps.
Answer:
40
Explanation:
120/30=40
Copper 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
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 RHow 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!!
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.
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.
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 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.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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What are the materials Identify a cube
Answer:
If the prime factors of a number are grouped in triples of equal factors, then that number is called a perfect cube. In order to check whether a number is a perfect cube or not, we find its prime factors and group together triplets of the prime factors. If no factor is left out then the number is a perfect cube.
Explanation:
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.
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
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
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.
what percent of earths carbon is stored in soil?
Answer:80%
Explanation:Total C in terrestrial ecosystems is approximately 3170 gigatons (GT; 1 GT = 1 petagram = 1 billion metric tons). Of this amount, nearly 80% (2500 GT) is found in soil (Lal 2008).
gr
12. I want to group items together that are a like in some way.
This is called
12
Answer:
it's called cassification?
The protein lysozyme unfolds at a transition temperature of 75.5°C, and the standard enthalpy of transition is 509 kJ mol-1. Calculate the entropy of unfolding of lysozyme at 25.0°C, given that the difference in the constant-pressure heat capacities upon unfolding is 6.28 kJ K-1 mol-1 and can be assumed to be independent of temperature. Hint: Imagine that the transition at 25.0°C occurs in three steps: (i) heating of the folded protein from 25.0°C to the transition temperature, (ii) unfolding at the transition temperature, and (iii) cooling of the unfolded protein to 25.0°C. Because the entropy is a state function, the entropy change at 25.0°C is equal to the sum of the entropy changes of the steps.
Answer:
0.4774 KJ/K.mol
Explanation:
We are told that the transition at 25.0°C occurs in three steps. Steps i, ii and iii.
Thus;
the entropy of unfolding of lysozyme = ΔS_i + ΔS_ii + ΔS_iii
Now,
C_p,m(unfolded protein) = C_p,m(folded protein) + 6.28 kJ/K.mol
Now, for the first process, ΔS_i is given as;
ΔS_i = C_p,m × In(T2/T1)
We are given;
T1 = 25°C = 25 + 273.15K = 298.15 K
T2 = 75.5°C = 75.5 + 273.15 K=348.65 K
Thus;
ΔS_i = C_p,m × In(348.65/298.15)
Now, for the third process, ΔS_iii is given as;
ΔS_iii = (C_p,m + 6.28 kJ/K.mol) × In(T1/T2)
Thus;
ΔS_iii = (C_p,m + 6.28 kJ/K.mol) × In(298.15/348.65)
Now, we don't know C_pm. So, we have to find a way to eliminate it. We will do it by rewriting In(298.15/348.65) in such a way that when ΔS_iii is added to ΔS_i, C_p,m will cancel out. Thus;
In(298.15/348.65) can also be written as;
In(348.65/298.15)^(-1) or
- In(348.65/298.15)
Thus;
ΔS_iii = - [(C_p,m + 6.28 kJ/K.mol) × In(298.15/348.65)]
Now, let's add ΔS_iii to ΔS_i to get;
ΔS_i + ΔS_iii = [C_p,m × In(348.65/298.15)] + [(-C_p,m - 6.28 kJ/K.mol) × In(348.65/298.15)]
ΔS_i + ΔS_iii = [C_p,m × In(348.65/298.15)] - [C_p,m × In(348.65/298.15)] - [6.28In(348.65/298.15)]
First 2 terms will cancel out to give;
ΔS_i + ΔS_iii = -6.28In(348.65/298.15)
ΔS_i + ΔS_iii = -0.9826 KJ/K.mol
Now,for process ii;
ΔS_ii = standard enthalpy of transition/Transition Temperature
Thus;
ΔS_ii = (509 KJ/K.mol)/348.65
ΔS_ii = 1.46 KJ/K.mol
Thus;
the entropy of unfolding of lysozyme = ΔS_i + ΔS_ii + ΔS_iii = -0.9826 + 1.46 = 0.4774 KJ/K.mol
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
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
The liter is defined as
a
1000 c3.
b
1000 m3.
c
1000 cm3.
d
1000 g3.
Answer:
C
Explanation: I mL = 1 cm3 and 1 L = 1000 mL so 1 L - 1000 cm3
Answer:
d
Explanation:
John eats a 1 lb steak, 8 chicken wings, a half pound of fries, potato salad, coleslaw,
and 6 slices of pizza at Food Emporium, his favorite restaurant. The waiter comes by
to offer John a slice of cake but he refuses because cake doesn't sound appetizing to
him although at any other time, John would have most likely ordered a slice of cake.
This is an example of which of the following phenomena.
O allesthesia
O Pteradactyl-like eating behaviors
O somatosensory simulation
O anorexia
The given example is a good description of the phenomena is:
D. AnorexiaAnorexia is an eating disorder which makes a person to feel that any extra food is going to cause him to become obese and because of this, he would reduce his intake of food.
As a result of this, they tend to get some health issues as a result of their refusal to eat certain foods or even eat at all. This is evident in the given example of John refusing to eat an extra slice of cake after having a huge meal at his favorite restaurant.
Therefore, the correct answer is option D
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_____ CH 4 + _____ O 2_____ CO 2+ H 2 O
Answer:
Carbon dioxide and oxygen
Explanation:
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
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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