Chemical Reactions Introduction

What happens to substances when a chemical reaction occurs?

• They changed their physical states.

• They change into another substance.

• They become more flexible.

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What do we call the atoms and molecules that are formed as a result of chemical reactions?

• Products

• Outcomes

• Artifacts

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What do we call substances that are used to bring about chemical reactions?

• Inhibitors

• Accelerators

• Reactants

• Solutions

What has to happen to the bonds between atoms and reactants in order for chemical reactions to take place?

• They have to be broken

• They have to join together

• They have to multiply

• They have to create energy

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Which of the following is a sign that a chemical reaction has occurred?

• Change in color

• Release of odor

• production of

• All of the above

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What is an insoluble solid that emerges from a chemical reaction within a liquid solution?

• Mixture

• Substance

• Suspension

• Precipitate

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What do we call chemical reactions that release energy to their surroundings?

• Biometric

• Cellular

• Exothermic

• Endothermic

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What usually happens to temperature during an endothermic reaction?

• It decreases

• It stabilizes

• It increases

• The temperature is not affected

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Photosynthesis is an example of what type of chemical reaction?

• Endothermic

• Scientific

• Exothermic

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The law of conservation of matter states the total mass of the products of a chemical reaction must equal what?

• The total mass of hydrogen atoms

• the total mass of the gas is in

• The total mass of the reactants

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