MTTC MTTC Chemistry 2

Question 1

In the reaction 2H₂ + O₂ → 2H₂O, how many moles of water are produced from 4 moles of H₂?

Accepted Answer

4

Answer

2

Answer

8

Answer

1

Question 2

What is the molarity of a solution prepared by dissolving 2 moles of NaCl in enough water to make 500 mL of solution?

Accepted Answer

4 M

Answer

1 M

Answer

0.25 M

Answer

2.5 M

Question 3

According to Le Chatelier's principle, if pressure is increased on a gaseous equilibrium system, the reaction shifts toward:

Accepted Answer

The side with fewer moles of gas

Answer

The side with more moles of gas

Answer

Neither side; pressure has no effect

Answer

Always toward the products

Question 4

Which type of chemical reaction is represented by: A + BC → AC + B?

Accepted Answer

Single replacement

Answer

Synthesis

Answer

Decomposition

Answer

Double replacement

Question 5

What is the standard enthalpy of formation (ΔHf°) for a pure element in its most stable state at standard conditions?

Accepted Answer

0 kJ/mol

Answer

100 kJ/mol

Answer

−100 kJ/mol

Answer

It varies by element

Question 6

Which of the following best describes an exothermic reaction?

Accepted Answer

The reaction releases energy to the surroundings

Answer

The reaction absorbs energy from the surroundings

Answer

The enthalpy change equals zero

Answer

The reaction only proceeds at high temperatures

Question 7

In a balanced chemical equation, the law of conservation of mass requires that:

Accepted Answer

The number of atoms of each element is equal on both sides

Answer

The number of molecules is equal on both sides

Answer

The volume of products equals the volume of reactants

Answer

The energy of reactants equals the energy of products