3/30/2021 EOG Review

Presentation

•

Science

•

8th Grade

•

Hard

•

NGSS

MS-PS1-5, MS-PS1-1, MS-PS1-2

Standards-aligned

Evie Locklear

Used 6+ times

FREE Resource

5 Slides • 6 Questions

3/30/2021 EOG Review

Chemical Reactions

REACTANTS ----> PRODUCTS

Matter cannot be created OR destroyed it can only be transferred (gas created)

Law of Conservation of Matter (matter can not be created or destroyed
both sides of the equation must equal

Law of Conservation of Matter (Chemical Equation)

Counting atoms 2H₂O

Subscripts: are the small numbers and belong to the ELEMENT they are behind EX. H₂
Coefficients: Large numbers in front and multiple everything behind them EX. 2H
1st Count the number of Capital Letters (ELEMENTS)
then look for subscripts and coeffiecients

Multiple Choice

Count the atoms NaOH

Na-1

O-1

H-1

N-1

A-1

O-1

H-1

Na-0

OH-0

Na-1

OH-1

Multiple Choice

Count the atoms Mg(OH)₂

Mg-1

O-1

H-2

Mg-1

O-2

H-2

Mg-2

O-2

H-2

Mg-1

O-0

H-0

Multiple Choice

If a chemical reaction such as the formation of iron oxide contains 4 atoms of iron (Fe) in the product, how many atoms of iron (Fe) would be in the reactants?

12 atoms of iron (Fe)

8 atoms of iron (Fe)

4 atoms of iron (Fe)

2 atoms of iron (Fe)

MAKE SURE EACH ELEMENT IS EQUAL ON EACH SIDE

Multiple Choice

WHICH OF THESE IS A CORRECT EQUATION OF A CHEMICAL REACTION?

NaOH+HCl --> NaCu+H₂O

Na+ O₂+ H₂ --> NaHCl₄

NaOH+HCl --> NaCl + H₂O

O₂+ O₂ --> 2O₂

Multiple Choice

Which answer makes this equation correct?

___ N₂+ ___H₂ --> ___ NH₃

2, 2, 2

1, 2, 2

1, 3, 2

2, 2, 3

Multiple Choice

Which answer makes the equation correct?

___KClO₃ --> ___ KCl + ___ O₂

1, 2, 3

2, 2, 3

1, 1, 1

1, 3, 2

3/30/2021 EOG Review

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