CHEMISTRY HIGH SCHOOL

Which of these best arranges the planets in the solar system in the increasing order of their period of rotation?Select one:
a. Jupiter → Uranus → Mars → Mercury
b. Mars → Venus → Earth → Mercury
c. Neptune → Saturn → Jupiter → Uranus
d. Uranus → Jupiter → Neptune → Saturn

Answers

Answer 1
Answer:

Answer:

The correct answer is option A, Jupiter → Uranus → Mars → Mercury

Explanation:

Time taken by Jupiter to make one rotation = 9h 56m

Time taken by Uranus to make one rotation = 17h 14m

Time taken by Neptune to make one rotation = 16h 6m

Time taken by Mars to make one rotation = 1d 0h 37m

Time taken by Earth  to make one rotation = 23 hours, 56 minutes, and 4 seconds

Time taken by Saturn to make one rotation = 0d 10h 42m

Time taken by Venus to make one rotation = 116d 18h 0m

Time taken by Mercuryto make one rotation = 58d 15h 30m

Thus the correct order is option A,  

Jupiter (9h 56m)< Uranus(17h 14m)< Mars(1d 0h 37m) <Mercury (58d 15h 30m)

Answer 2
Answer: a. Jupiter → Uranus → Mars → Mercury

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A substance has a triple point at -24.5 ∘C and 225 mmHg. What is most likely to happen to a solid sample of the substance as it is warmed from -35 ∘C to 0 ∘C at a pressure of 220 mmHg? A substance has a triple point at -24.5 and 225 . What is most likely to happen to a solid sample of the substance as it is warmed from -35 to 0 at a pressure of 220 ? The solid will melt into a liquid, The solid will sublime into a gas, or Nothing (the solid will remain as a solid).

At the end of 2012, global population was about 7.0 billion people. What mass of glucose in kg would be needed to provide 1200 cal/person/day of nourishment to the global population for one year? Assume that glucose is metabolized entirely to CO₂(g) and H₂O(l) according to the following thermo-chemical equation: C₆H₁₂O₆(s)+6O₂(g)⟶6CO₂(g)+6H₂O(l); ΔH₀ = −2803kJ

Answers

Final answer:

To calculate the mass of glucose needed to provide nourishment to the global population for one year, multiply the daily energy requirement by the total number of days and the global population. Convert the energy to mass using the thermo-chemical equation.

Explanation:

To calculate the mass of glucose needed to provide 1200 cal/person/day of nourishment to the global population for one year, we need to determine the total energy required for one year and then convert it to mass using the thermo-chemical equation. First, calculate the total energy required by multiplying 1200 cal/person/day by the total number of days in a year and the global population. Next, convert the energy to kilojoules. Finally, use the energy change given in the thermo-chemical equation to convert the energy to mass of glucose.

  1. Calculate the total energy required: 1200 cal/person/day x 365 days/year x 7.0 billion people.
  2. Convert energy to kilojoules: Total energy in cal x 4.184 J/cal x 10^-3 kJ/J.
  3. Convert energy to mass of glucose: Energy in kJ / energy change in kJ (ΔH₀) in the thermo-chemical equation.

The final result will give you the mass of glucose needed in kilograms.

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Which of the following is a quemical property ?

Answers

One chemical property would be reactivity of a particular substance.

A different student is given a 10.0g sample labeled CaBr2 that may contain an inert (non-reacting) impurity. Identify a quantity from the results of laboratory analysis that the student could use to determine whether the sample was pure.

Answers

Answer:

Melting Point.

Explanation:

In testing of a sample has impurities, we have to check the samples’s melting or boiling points or we a separation technique called chromatography.

Now, CaBr_2 which is calcium bromide is a White Hygroscopic Powder. Therefore it is a solid.

Now, a pure solid will always have a fixed melting point which means that it will melt completely at only one temperature.

However, if there are impurities, the melting point of a substance is affected in two ways:

-It's lower than than the fixed melting point

- It would melt at a range of different temperatures as opposed to a fixed temperature for the pure form.

Therefore, a quantity that can be used to determine whether the sample was pure will be melting point.

Final answer:

The student could analyze the melting or boiling point of the CaBr2 sample to determine its purity.

Explanation:

In order to determine whether the sample of CaBr2 is pure, the student can analyze the melting point or boiling point of the compound. The pure compound will have a specific melting and boiling point, while the presence of impurities can cause a change in these values. By comparing the experimental values of the sample with the known values of pure CaBr2 the student can determine whether the sample is pure or contaminated.

A pure solid, on the other hand, will always have a set melting point, meaning that it will only melt fully at that one temperature. The melting point of a substance, however, is impacted by impurities when it is lower than the fixed melting point. Additionally, in contrast to the pure form's constant temperature, it would melt at a variety of various temperatures.

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1. Jack consumes two slices of pizza and drinks two large glasses of soda. Half an hour later, he complains of a stomachache. What is the most likely reason for Jack's upset stomach?A. Soda and lactose from the cheese combined and slowed enzyme activity.
B. Soda mixed with the pizza sauce and sped up digestive enzyme activity.
C. Soda raised the pH in his stomach and sped up digestive enzyme activity.
D. Soda lowered the pH in his stomach and slowed digestive enzyme activity.

2. Which factor decreases the rate of a chemical reaction?
A. An inhibitor
B. A co-factor
C. Increased substrate
D. Cold temperature

3. Which component decreases the activation energy of a chemical reaction?
A. An inhibitor solution
B. Presence of an enzyme
C. Lower substrate concentration
D. Neutral pH levels

4. A biologist adds a vitamin solution to an enzyme/substrate solution that requires co-factors. What will happen to the substrate?
A. The vitamins will bond to the enzymes and increase their reactivity with the substrates.
B. The vitamins will bond to the enzymes and decrease their reactivity with the substrates.
C. The substrate molecules will bond to the vitamin molecules and inhibit bonding of the enzyme.
D. The substrate molecules will bond to the vitamin molecules and stimulate bonding of the enzyme.

5. Jennifer stews peaches to make peach jelly. She believes the homemade jelly will make a healthy treat full of vitamins and enzymes her body needs. Which of the following disproves her prediction?
A. The peaches don't contain enzymes.
B. The jelly has too much sugar to be healthy.
C. The enzymes in the peaches have denatured.
D. The vitamins in the peaches will inhibit the enzymes.

6. What statement best describes what happens during the catalytic cycle?
A. The enzyme breaks the substrate apart to prepare for the reaction.
B. The enzyme positions the substrate to increase access during a reaction.
C. The substrate uses enzyme energy to start the reaction.
D. The active site releases the substrate and replaces it with an inhibitor.

Answers

Answer 1) Option D) Soda lowered the pH in his stomach and slowed digestive enzyme activity.


Explanation : Consuming soda after eating pizza lowered the pH of the stomach which consequently, slowed the digestive enzyme activity in the stomach. The enzymes actively digest the food only in highly acidic environment.


Answer 2) Option A) An inhibitor


Explanation : An inhibitor is a substance usually added to a progressing chemical reaction to decrease the rate of reaction and finally stop the reaction.


Answer 3) Option B) Presence of an enzyme


Explanation : When an enzyme is added to a chemical reaction it is often seen that it lowers the energy of activation and catalyzes the reaction. So, enzyme acts as a catalyst and increases the reaction rate.


Answer 4) Option A) The vitamins will bond to the enzymes and increase their reactivity with the substrates.


Explanation : When the biologists adds a vitamin solution to an enzyme or a substrate solution the bonding will take place between vitamins and enzymes and as a result it will increase the reactivity of the substrates.


Answer 5) Option C) The enzymes in the peaches have denatured.


Explanation : When enzymes are stewed or rather boiled they become denatured and the bonds between them breaks, which makes the enzyme useless. Hence, proteins should be eaten raw without boiling at higher temperatures.


Answer 6) Option A) The enzyme breaks the substrate apart to prepare for the reaction.


Explanation : In a catalytic reaction the enzymes usually break the substrate and create more surface area for the reaction to occur.
1) D
2) A
3) B
4) A
5) C
6) A

Determine the pressure exerted by 0.352 mol of oxygen gas in a 1.75 L container at room temperature (25 degrees Celsius). Show all your work!​

Answers

Answer:

P = 4.92 atm

Explanation:

Given data:

Number of mole of oxygen = 0.352 mol

Volume of gas = 1.75 L

Temperature = 25°C

Pressure exerted by gas = ?

Solution:

The given problem will be solve by using general gas equation,

PV = nRT

P= Pressure

V = volume

n = number of moles

R = general gas constant = 0.0821 atm.L/ mol.K  

T = temperature in kelvin

Now we will convert the temperature.

25+273 = 298 K

P × 1.75 L = 0.352 mol  × 0.0821 atm.L/ mol.K   ×298 K

P = 8.61 atm.L /  1.75 L

P = 4.92 atm

A gas absorbs 3.4 kJ of heat and does 1.9 kJ of work. Calculate ΔE

Answers

Answer:

Answer is given below:

Explanation:

Given Data:

heat = 3.4kJ

work done is = 1.9 kJ

To Find:

ΔE=?

Formula:

ΔE = q + w

Solution:

ΔE = q + w

ΔE = 3.4 kJ + 1.9kJ

ΔE =  5.3 kJ
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