Daily Warm Up: Chemistry Part 1

A molecule is:

• a single atom

• a group of atoms bonded together

• a type of chemical reaction

• a form of energy

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NGSS.MS-PS1-1

Reactants in a chemical reaction are:

• the substances that are produced in the reaction

• the substances that are consumed in the reaction

• the substances that act as catalysts

• the substances that do not participate in the reaction

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The products in a chemical reaction are:

• Reactants

• Catalysts

• Products

• Inhibitors

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A chemical reaction is a process that involves the transformation of one or more substances into different substances. Which of the following best describes a chemical reaction?

• A process that involves the transformation of one or more substances into different substances

• A process that involves the physical change of a substance

• A process that involves the change of state of a substance

• A process that involves the mixing of substances without any change

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What is a chemical change?

• A process where substances combine or break apart to form new substances.

• A change in the state of matter without forming new substances.

• A temporary change in the appearance of a substance.

• A change that can be easily reversed.

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What is a physical change?

• A change in which the substance's chemical identity is altered

• A change that involves the formation of new substances

• A change that is irreversible

• A change in which the substance's physical properties are altered but its chemical identity remains the same

What is an endothermic reaction?

• A reaction that absorbs heat from the surroundings

• A reaction that releases heat to the surroundings

• A reaction that occurs spontaneously

• A reaction that involves a catalyst

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What is an exothermic reaction?

• A reaction that releases energy in the form of heat

• A reaction that absorbs energy in the form of heat

• A reaction that neither absorbs nor releases energy

• A reaction that requires light to proceed

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A catalyst in a chemical reaction is:

• a substance that increases the rate of a reaction without being consumed

• a reactant that is completely used up in a reaction

• a product formed in a chemical reaction

• a substance that decreases the rate of a reaction

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NGSS.MS-PS1-2

Explain the Law of Conservation of Mass. The Law of Conservation of Mass states that the mass of the reactants in a chemical reaction must equal the mass of the products.

• The mass of the reactants is greater than the mass of the products.

• The mass of the reactants is less than the mass of the products.

• The mass of the reactants is equal to the mass of the products.

• The mass of the reactants is unrelated to the mass of the products.

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NGSS.MS-PS1-5