Properties of Chemical Reactions

A chemical change is different than a physical change because in a chemical change

• chemicals are used

• molecules do not physically touch

• a new substance is formed and in a physical no new substance is formed

• the change can be seen but in a physical change it cannot

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NGSS.MS-PS1-1

NGSS.MS-PS1-5

Which of the following 2 are chemical reactions?

• sugar dissolving in water

• water turning into steam

• burning wood

• mixing baking soda and vinegar

• tearing paper

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

How many Carbons are present on the reactant side?

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-1

How many Hydrogens are on the product side of this chemical equation?

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

How many Oxygens are on the product side of this chemical equation?

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Why are chemical equations always balanced? Select ALL that apply.

• Matter cannot be created.

• Matter cannot be destroyed.

• Matter can only be rearranged/conserved.

• Matter doesn't matter.

Tags

NGSS.MS-PS1-5

Is this chemical equation balanced? Why or why not? Choose the BEST answer.

• Yes, the amount of atoms for each element are equal on both the reactant and product side.

• No, the carbons are not the same number on both the reactant and product side.

• No, neither the carbons or hydrogens are the same amount on both the reactant and product side.

• No, none of the elements (carbon, hydrogen, or oxygen) are the same amount on both the reactant and product side.

Tags

NGSS.MS-PS1-5

Which is the correct word equation for photosynthesis?

• water + glucose + oxygen ---> energy + carbon dioxide

• energy + oxygen + carbon dioxide ---> water + glucose

• water + carbon dioxide + energy ---> glucose + oxygen

• glucose + oxygen ---> water + carbon dioxide + energy

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NGSS.MS-LS1-6

Which of the following is the word equation for cellular respiration?

• water + carbon dioxide + energy ---> glucose + oxygen

• water + glucose ---> energy + carbon dioxide + oxygen

• oxygen + carbon dioxide ---> water + energy + glucose

• glucose + oxygen ---> water + carbon dioxide + energy

Tags

NGSS.MS-LS1-7

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

• A chemical has turned a different color, bubbled, and/or changed temperature.

• A chemical has changed to a different state of matter, such as a liquid to a solid.

• A chemical has changed size.

• A chemical has become a different shape.

Tags

NGSS.MS-PS1-2