Chemical Reactions Unit Test Review

How many substances join to form new chemical properties?

• only two

• two or more

• at least 3

• none

Salt water is a ​ (a)   change because ​​ (b)  

• physical
• no new substances formed; it's reversible
• chemical
• there's an unexpected color change

Rusting is a ​ (a)   . What EVIDENCE supports this claim​ (b)   ?

• chemical reaction
• unexpected color change
• physical change
• expected color change

The production of a solid when two liquids interact

• is weird

• is a precipitate

• never happens

• is a producer

A symbolic representation of the reactants and products in a chemical reaction.

• chemical symbol

• shortcut

• chemical formula

• chemical equation

Tie dye is a ​ (a)   . What EVIDENCE supports this claim?​ (b)  

• physical change
• expected color change
• chemical reaction
• unexpected color change

In a chemical reaction, the mass of the reactants is ​ (a)   the mass of the products

• equal to
• greater than
• less than

Choose ALL evidences of physical change.

• change in shape or appearance

• state change

• expected color change

• expected temperature change

Scrambling eggs, boiling water, dissolving sugar, dicing vegetables are 4 examples of what?

• physical change

• chemical change

• state changes

• new substances being formed

What is inside bubbles during a CHEMICAL reaction?

• carbon dioxide

• oxygen

• a NEW gas

• nothing