Chemical Changes

All of the following chemical equations are balanced EXCEPT -- (8.5F)

• a

• b

• c

• d

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

In a chemical reaction, bonds are broken and new bonds are formed that create new substances. The bonds that are broken are called what?

• Reactants

• Products

• Atoms

• Catalysts

Tags

NGSS.MS-PS1-1

___________________ are the elements are compounds that leave (are formed in) a chemical
reaction.

• Polymers

• Bonds

• Reactants

• Products

Tags

NGSS.MS-PS1-2

The substances at the beginning of a chemical equation are called the ____

• product

• yield

• chemical symbol

• reactants

What is the arrow in a chemical equation...
H_{2 +} O --> H₂O

• Reactants

• Products 

• Yields 

• Chemical Equation 

Which of the following is evidence of a chemical reaction?

• fizzing

• water changing to ice

• saltwater

• paper being cut in half

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following models best demonstrates a balanced chemical equation?

• F

• G

• H

• J

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

The equation below represents a chemical reaction that occurs in living cells. How many atoms are represented in the reactants of this equation?

• 6
  6

• 12
  12

• 24
  24

• 36
  36

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What are Chemical Reactions?

• It's when you mix substances.

• a process in which atoms rearrange to form new substances

• When something bubbles.

• letter and numbers showing the types and number of atoms

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following is NOT evidence that that a chemical reaction has occurred?

• produces light/heat

• production of a gas

• formation of a precipitate

• melting

Tags

NGSS.MS-PS1-2