10 Questions
What occurs during a chemical reaction?
Movement of electrons and transfer of energy
Which best describes a physical change?
Change in appearance without altering the substance at the molecular level
What distinguishes a chemical change from a physical change?
Results in the formation of new compounds with different properties
Which of the following is an example of a chemical change?
Burning wood to produce ash
What happens at the molecular level during a chemical reaction?
Electrons are exchanged to form new compounds
What are the products of the combustion reaction in a car engine?
Carbon dioxide and water
What is a common indicator of a chemical reaction?
Formation of a solid
In an endothermic reaction, what happens to the energy level of the products?
Energy level increases
What is the main purpose of activation energy in a chemical reaction?
To speed up the reaction rate
What is the function of ATP molecules created during cellular respiration?
To power cellular processes and muscles
Learn about the definition of a chemical reaction, which occurs when substances undergo a change affecting their physical properties and chemical behaviors. Explore how atoms exchange electrons to create new substances and transfer energy.
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