Quarter 2

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Question 1 of 10 0% read

1. When equilibrium is reached, the reaction mixture:

A Contains only products

B Contains only reactants

C Contains both reactants and products

D Stops reacting

2. The main purpose of electroplating is to:

A Increase weight

B Prevent corrosion and enhance appearance

C Reduce conductivity

D Increase rusting

3. Khalid is learning about galvanizing. He understands that galvanized steel is steel coated with zinc. How does zinc protect the steel?

A By forming a protective layer of zinc oxide

B By acting as a barrier and as a sacrificial anode

C By making the steel non-reactive

D By changing the steel's structure

4. If equilibrium constant equals 1, it means:

A Reaction goes to completion

B Reactants are favored

C Products and reactants are equally favored

D No reaction occurs

5. Tina is studying the effect of pressure on equilibrium. She knows that for a reaction with more moles of gas on the reactant side, increasing pressure will shift the equilibrium to:

A The left

B The right

C No effect

D Both sides equally

6. Uma is learning about mole-particle calculations. She knows that the number of particles = moles × Avogadro's number. If she has 2.5 moles of CO2, how many molecules?

A 1.506 × 10^24 molecules

B 6.022 × 10^23 molecules

C 1.204 × 10^24 molecules

D 1.806 × 10^24 molecules

7. A solution with pH greater than 7 is:

A Acidic

B Neutral

C Basic

D Saline

8. In an exothermic reaction, ΔH is:

A Positive

B Zero

C Negative

D Constant

9. Khalid is calculating the mass of 2 moles of oxygen gas (O2). The molar mass of O2 is 32 g/mol. What is the mass?

A 32 g

B 48 g

C 64 g

D 16 g

10. The formula mass of NaCl is:

A 23 u

B 35.5 u

C 58.5 u

D 46 u

Quarter 2

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