EIT Chemistry

Question 1

What is the molarity of a solution prepared by dissolving 40 g of NaOH (MW = 40 g/mol) in 1 liter of water?

Accepted Answer

1.0 M

Answer

0.5 M

Answer

2.0 M

Answer

4.0 M

Question 2

What is the pH of a 0.01 M HCl solution?

Accepted Answer

2

Answer

1

Answer

3

Answer

4

Question 3

Which of the following is an example of an exothermic reaction?

Accepted Answer

Combustion of methane

Answer

Photosynthesis

Answer

Melting of ice

Answer

Electrolysis of water

Question 4

The ideal gas law is PV = nRT. What are the SI units of the universal gas constant R?

Accepted Answer

J/(mol·K)

Answer

Pa·m³

Answer

N/m²

Answer

kg·m/s²

Question 5

For a first-order reaction with rate constant k = 0.693 min⁻¹, what is the half-life?

Accepted Answer

1.0 min

Answer

0.5 min

Answer

2.0 min

Answer

1.44 min

Question 6

How many moles of O₂ are required to completely combust 2 moles of CH₄?

Accepted Answer

4

Answer

2

Answer

6

Answer

8