Evidence of Chemical Reactions
Quiz
•
Chemistry
•
8th Grade
•
Medium
Wayground Content
Used 23+ times
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15 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
What are the substances at the beginning of a chemical equation called?
Products
Catalysts
Reactants
Solvents
2.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
In the equation 2Mg + O2 ---> 2MgO, what are the reactants?
Mg and O
MgO and O2
Mg and O2
2Mg and O2
3.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
How can you tell if a chemical reaction has occurred?
By observing changes such as color change, temperature change, gas production, or formation of a precipitate.
By measuring the pH level of the solution.
By checking the density of the substances involved.
By observing the size of the reactants before and after the reaction.
4.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
What is an exothermic reaction?
A chemical reaction that absorbs energy in the form of heat.
A chemical reaction that releases energy in the form of heat.
A chemical reaction that occurs at low temperatures.
A chemical reaction that requires a catalyst to proceed.
5.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
Give an example of evidence of a chemical reaction.
Sugar that is burned gives off an odor and turns brown and then black.
Water boiling to form steam.
Ice melting into water.
Salt dissolving in water.
6.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
What does evidence of a chemical reaction indicate?
A new substance has formed.
The temperature has changed.
The color of the substance has remained the same.
The mass of the substance has decreased.
7.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
What is a chemical reaction?
A process where reactants are transformed into products, resulting in the formation of new substances.
A method of separating mixtures into their individual components.
A physical change that alters the state of matter without changing its chemical composition.
A process that only occurs in living organisms.
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