Chemistry Quiz

Which of the following statements best describes the law of conservation of mass?

• Mass can neither be created nor destroyed in a chemical reaction.

• Mass increases as products are formed in a chemical reaction.

• Mass decreases when reactants are converted into products.

• Mass is only conserved in physical changes, not in chemical reactions.

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DOK Level 1: Recall

• 1

• 2

• 3

• 4

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DOK Level 2: Skill/Concept

• Synthesis

• Decomposition

• Single displacement

• Double displacement

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DOK Level 1: Recall

Which factor does NOT affect chemical equilibrium?

• Concentration of reactants

• Temperature

• Presence of a catalyst

• Color of reactants

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DOK Level 1: Recall

• The equilibrium will not change.

• The reaction will stop.

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DOK Level 2: Skill/Concept

What is the main reason for balancing chemical equations?

• To satisfy the law of conservation of mass.

• To make equations look simpler.

• To use fewer chemicals in the laboratory.

• To speed up the reaction process.

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DOK Level 1: Recall

• Decomposition

• Synthesis

• Single displacement

• Double displacement

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DOK Level 1: Recall

How does an increase in temperature generally affect the position of an endothermic reaction at equilibrium?

• Shifts the equilibrium to the right

• Shifts the equilibrium to the left

• Does not affect the equilibrium

• Stops the reaction

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DOK Level 2: Skill/Concept

In the context of Le Chatelier's principle, what effect does a decrease in concentration of a product have on the equilibrium position of a reversible reaction?

• Shifts the equilibrium towards the products

• Shifts the equilibrium towards the reactants

• No effect on the equilibrium

• Makes the reaction irreversible

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DOK Level 2: Skill/Concept

• Equal numbers of each type of atom on both sides of the equation

• More oxygen on the product side

• More carbon on the reactant side

• An equal number of molecules on each side

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DOK Level 2: Skill/Concept