Chemistry Crush (8th Grade)

What classifies a substance as a mixture?

• Made up of two or more substances that are chemically bonded. 
• One substance that can not be physically separated 
• Two or more substances that are not chemically bonded.
• A substance that can not be seperated 

What cannot be broken down into other substances?

• Compound
• Mixture
• Solids
• Element

Mixtures are separated through ___________changes.

• mixture
• compound
• physical

An element is made up of only one kind of _____.

• isotope
• plastic
• atom
• metal

Tags

NGSS.MS-PS1-1

The positive particles of an atom are 

• electrons 
• positrons 
• neutrons 
• protons 

the central region of an atom where its neutrons and protons are is its 

• nucleus 
• electron cloud
• core 
• center 

Tags

NGSS.MS-PS1-1

What is the left 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-PS1-2

NGSS.MS-PS1-5

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

This law states that energy cannot be created or destroyed, but it can change form.

• Endothermic reaction
• Law of Conservation of Energy
  LOCOE
• Exothermic reaction
• Law of Conservation of Matter
  LOCOM

Tags

NGSS.MS-PS3-5