Unit#3: Stoichiometry

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1. If percentage yield is 100%, it means:

A No reaction occurred

B Actual yield is zero

C Actual yield equals theoretical yield

D Loss of product occurred

2. Strength of a solution is defined as:

A Moles per liter

B Grams per liter

C Liters per mole

D Moles per gram

3. The mole ratio is valid only for:

A Unbalanced equations

B Balanced equations

C Word equations

D Ionic equations

4. Which quantity is used to compare reactants in a balanced equation?

A Mass ratio

B Volume ratio

C Mole ratio

D Density ratio

5. Molarity decreases when:

A Solute is added

B Solvent is removed

C Solution is diluted

D Temperature is lowered

6. Which yield is used to measure efficiency of a reaction?

A Actual yield

B Theoretical yield

C Percentage yield

D Limiting yield

7. Which formula is used for dilution?

A M = m/V

B M₁V₁ = M₂V₂

C n = m/M

D PV = nRT

8. During dilution, the number of moles of solute:

A Increases

B Decreases

C Remains constant

D Becomes zero

9. Percentage yield can be greater than 100% if:

A Reaction is incomplete

B Product is impure

C Limiting reactant is less

D No side reactions occur

10. The amount of substance is directly proportional to:

A Volume

B Mass

C Number of particles

D Density

Unit#3: Stoichiometry

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