Chemistry Chemical Reactions Review

Which of the following would increase the rate of a chemical reaction?

• Freezing the chemicals

• Increasing the temperature of the reagents

• Removing a catalyst

• Using less chemicals

Tags

NGSS.HS-PS1-5

Which of the following would increase the rate of a chemical reaction?

• Removing a catalyst

• Diluting the chemicals

• Decreasing the temperature

• Adding a catalyst

Tags

NGSS.HS-PS1-5

Which of the following would increase the rate of a chemical reaction?

• Lowering temperatrure

• Removing a catalyst

• Making the chemicals more concentrated

• Using less chemicals

Which of the following would increase the rate of CO2 made using marble chips and HCl?

• Lowering the temperature

• Crushing the marble chips

• Using less acid

• Using bigger marble chips

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

True or false: Exothermic reactions mostly release energy.

• True

• False

Tags

NGSS.MS-PS3-3

NGSS.MS-PS3-5

is the process in which atoms are rearranged to produce a different substance.

• chemical reaction

• chemical equations

• chemical formula

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

______________________ is a representation of a chemical reaction that uses symbols to show the relationship between the reactants and the products.

• chemical reaction

• chemical equation

• chemical formula

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NGSS.HS-PS1-7

Which of the following examples shows that a chemical reaction has occurred? 

• A rock breaks into smaller pieces when it is struck with a hammer.

• Rust forms on a hammer that has been left outside to long. 

• A cup of water turns pink when a few drops of red food coloring are added. 

• A solid is formed when heat is removed from a sample of water. 

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

A student places a piece of a potato into a container of hydrogen peroxide. One observation the student makes is that bubbles form around the potato. The presence of bubbles might indicate the formation of a new substance because bubbles - 

• could show that a gas is forming

• always rise to the top of a liquid. 

• are almost always perfectly spherical.

• usually burst after a few minutes.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Silverware tarnishing is an example of a _____ change

• Physical

• Chemical

Tags

NGSS.MS-PS1-2