CHEMISTRY HIGH SCHOOL

Which has should only be produced in a fume hood?a. Cl2
b. CO2
c. H2
d. H2O

Answers

Answer 1
Answer: The gas that should only be produced in a fume hood is a. Cl2.
Chlorine gas is toxic gas. Upon inhalation, it irritates the pulmonary tract and damages the respiratory tract. Both short term and long term exposure to Cl2 gas are known to have destructive effects.

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Which is the electron configuration for zinc? A. 1s₂2s₂2p₆3s₂3p₆3d84s₂ B. 1s₂2s₂2p₆3s₂3p₆3d₁₀4s₁ C. 1s₂2s₂2p₅3s₂3p₆3d₁₀4s₂ D. 1s₂2s₂2p₆3s₂3p₆3d₁₀4s₂

Answers

Answer:

Explanation:

The atomic number of zinc is 30, which means that the neutral atom has equal numbers of protons and electrons, so a neutral atom of zinc would have 30 electrons.

The electron configuration of a neutral zinc atom is 1s

2

2s

2

2p

6

3s

2

3p

6

3d

10

4s

2

.

The Zn

2+

 ion has lost two electrons, which leaves it with 30 protons and 28 electrons.

The electron configuration of Zn

2+

 is 1s

2

2s

2

2p

6

3s

2

3p

6

3d

10

.

The color and temperature of stars are closely related. Which color star is the hottest?Use the drop-down menus to identify which of these stars is the smallest, which is the largest, and which is in the middle.

Answers

Answer:

blue star is the hottest of all

Explanation:

Blue stars are blue because of the temperature of their surface and they are so hot because they are much more massive than cooler stars like our sun.

Find K for this redox reaction when E = -2.12 V: Zn2+ + 2Cl- → Zn + Cl2.

Answers

Answer:

K = 2 × 10⁻⁷²

Explanation:

Step 1. Determine the value of n

Zn²⁺ + 2e⁻ → Zn

2Cl⁻ → Cl₂+ 2e⁻          

Zn²⁺ + 2Cl⁻ → Zn + Cl₂; E = -2.12 V

n = 2 mol electrons

===============

Step 2. Calculate K

The formula relating E and K is

E = (RT)/(nF)lnK

E = -2.12 V

R = 8.314 J·K⁻¹mol⁻¹

T = 298.15 K

n = 2

F = 96 485 C/mol

-2.12 = (8.314 × 298.15)/(2 × 96 485)lnK     Do the multiplications

-2.12 = 2479/192 970 lnK     Do the division

-2.12 = 0.012 85 lnK             Divide both sides by 0.012 85 and transpose

ln K = -165.0                          Take the antilog of both sides

K = e^(-165.0)

K = 2 × 10⁻⁷²

A sample of gas is held at constant pressure. Increasing the Kelvin temperature of this gas sample causes the average kinetic energy of its molecules to(1) decrease and the volume of the gas sample to decrease
(2) decrease and the volume of the gas sample to increase
(3) increase and the volume of the gas sample to decrease
(4) increase and the volume of the gas sample to increase

Answers

Increasing the temperature of a gas sample means that heat energy is been supplied to the System. When energy is been supplied heat energy is transformed into kinetic energy of the gas molecules.
Therefore kelvin temperature increases means more energy given to the system therefore average kinetic energy of molecules increase.
When the kinetic energy of molecules increase they move about more and take up more space. Hence volume too increases.
Therefore the correct answer is
4) average kinetic energy of molecules increase and volume of the gas sample increases
The answer is (4). When the pressure is constant, he temperature increasing can cause both the average kinetic energy of its molecules and the volume of gas sample increase.

Which two factors must be equal when a chemical reaction reaches equilibrium?(1) the concentration of the reactants and the concentration of the products
(2) the number of reactant particles and the number of product particles
(3) the rate of the forward reaction and the rate of the reverse reaction
(4) the mass of the reactants and the mass of the products

Answers

The correct answer is option 3. Equilibrium is achieved in a chemical reaction when the rate of the forward reaction is the same for the rate of the backward reaction and when the reaction has stopped.

A sample of nitric acid contains both H3O ions and NO3 ions. This sample has a pHvalue of 1.
What is the color of methyl orange after it is added to this sample?

Answers

The indicator will lead to a solution that has a red color. Methyl orange is an indicator used in titrations because it changes colors at all pH values. When in acidic solution it is red and in basic it is yellow. A pH of 1 is acidic, therefore a red solution.
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