Chemical Reactions Exam Prep

What are the starting materials in a chemical reaction called?

• Products

• Enzymes

• Catalysts

• Reactants

What are the substances produced by a chemical reaction called?

• byproducts

• products

• ingredients

• reactants

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What is the law of conservation of mass in relation to chemical reactions?

• Matter is created and destroyed in chemical reactions

• Matter is neither created nor destroyed, it is only transformed from one form to another.

• Matter can be transformed into energy in chemical reactions

• Matter can be transformed into antimatter in chemical reactions

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NGSS.MS-PS1-5

What is a chemical equation?

• A mathematical equation involving chemicals

• A recipe for cooking chemicals

• A symbolic representation of a chemical reaction

• A list of chemical elements

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What is the difference between a reactant and a product in a chemical reaction?

• Reactants participate in the reaction, while products are formed as a result of the reaction.

• Reactants and products have no role in a chemical reaction.

• Reactants and products are the same thing in a chemical reaction.

• Reactants are formed as a result of the reaction, while products participate in the reaction.

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Give an example of a chemical reaction and identify the reactants and products involved.

• Carbon and nitrogen are the reactants, and carbon dioxide is the product.

• Hydrogen and oxygen are the reactants, and water is the product.

• Oxygen and nitrogen are the reactants, and carbon dioxide is the product.

• Sodium and chlorine are the reactants, and salt is the product.

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Explain the concept of balancing chemical equations.

• Balancing chemical equations involves ensuring that the number of atoms of each element is the same on both sides of the equation.

• Balancing chemical equations is not necessary in chemistry.

• Balancing chemical equations means adding or removing elements from the equation.

• Balancing chemical equations involves changing the chemical formula of the compounds.

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How does the presence of a catalyst affect a chemical reaction?

• It changes the color of the reaction

• It decreases the rate of the reaction

• It increases the rate of the reaction

• It has no effect on the reaction

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Why is it important to understand the concept of products and reactants in chemistry?

• To learn about the history of chemistry

• To impress friends with chemical knowledge

• To memorize the periodic table

• To predict the outcome of chemical reactions and understand stoichiometry.

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What is the role of heat in a chemical reaction?

• Heat is not involved in chemical reactions.

• Heat can either speed up or slow down a chemical reaction.

• Heat always slows down a chemical reaction.

• Heat always speeds up a chemical reaction.

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