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Chemical Reactions Definition

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Questions and Answers

What occurs during a chemical reaction?

Change in state from solid to liquid
No change in physical or chemical properties
Formation of the same substance
Movement of electrons and transfer of energy (correct)

Which best describes a physical change?

Atoms lending, borrowing, or sharing electrons
Change in chemical properties
Formation of new compounds
Change in appearance without altering the substance at the molecular level (correct)

What distinguishes a chemical change from a physical change?

Involves only changes in state
Occurs without any exchange of electrons
Results in the formation of new compounds with different properties (correct)
Affects only the appearance of the substance

Which of the following is an example of a chemical change?

Burning wood to produce ash (D) Signup and view all the answers

What happens at the molecular level during a chemical reaction?

Electrons are exchanged to form new compounds (D) Signup and view all the answers

What are the products of the combustion reaction in a car engine?

Carbon dioxide and water (A) Signup and view all the answers

What is a common indicator of a chemical reaction?

Formation of a solid (C) Signup and view all the answers

In an endothermic reaction, what happens to the energy level of the products?

Energy level increases (C) Signup and view all the answers

What is the main purpose of activation energy in a chemical reaction?

To speed up the reaction rate (C) Signup and view all the answers

What is the function of ATP molecules created during cellular respiration?

To power cellular processes and muscles (B) Signup and view all the answers

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