8th grade Chemical Reactions & Equations

The mathematical representation that describes what happens in a chemical reaction is known as 

• chemical equation
• reactant
• chemical reaction
• product

Tags

NGSS.MS-PS1-5

What does the Law of Conservation of Mass state?

• Matter cannot be created or destroyed in a chemical reaction.
• Matter can only be lost in a chemical reaction.
• Matter can only be gained in a chemical reaction.
• Matter can be created or destroyed in a chemical reaction. 

Tags

NGSS.MS-PS1-5

What is the left part of a chemical equation called?
H_{2 +} O → H₂O

• Reactants
• Products 
• Yields 
• Chemical Equation 

What is the right part of a chemical equation called?
H_{2 +} O → H₂O

• Reactants
• Products 
• Yields 
• Chemical Equation 

Is this balanced?
2HgO → 2Hg + O₂

• Yes
• No

Tags

NGSS.MS-PS1-5

You know you a chemical reaction has occurred if 

• there is a precipitate.
• there is a color change.
• there is a temperature change.
• All of these answers are evidence.

Tags

NGSS.MS-PS1-2

When materials combine to form new compounds it is a chemical change. Which example is a chemical change?

• baking powder fizzing
• water boiling
• ice melting
• sugar cube dissolving

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

A reaction that gives off heat to its surroundings is...

• exothermic
• endothermic
• endergonic
• none of these

Tags

NGSS.MS-PS1-4

Which type of reaction will feel cold?

• exothermic
• exergonic
• endothermic
• none of these

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

The process during which substances interact (react) to form new substances.

• Precipitate
• chemical equation
• LOCOM
• Chemical reaction

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5