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Chemical Reactions Unit Review Part 1

Total questions: 56

Worksheet time: 49mins

Name
Class
Date
1.

Burning is a ______ change

a)

Physical

b)

Chemical

2.

Melting is a ______ change

a)

Physical

b)

Chemical

3.

Which row shown represents compounds?

a)

Top row

b)

Bottom row

4.

Which of the following is an example of chemical change?

a)

A rusted bike

b)

A cut piece of wood

c)

A crushed can

d)

A melted ice cube

5.

In an exothermic reaction, heat is ...

a)

Given off

b)

Taken in

6.

Is NaCl (sodium chloride) an element or compound?

a)

Element

b)

Compound

7.

In this equation 2NaF + Br2 →2NaBr +F2

The underlined part represents...

a)

Products

b)

Reactants

c)

Energy

8.

What is the 'Law of Conservation of Matter'?

a)

It states that during a chemical reaction atoms get created

b)

It states that during a chemical reaction, atoms get destroyed or changed

c)

It states that during a chemical reaction, atoms rearrange, but, are never destroyed or created

d)

It states that during a chemical reaction, materials change phase

9.

Classify this reaction: 

 LiF+NaOH → LiOH + NaFLiF+NaOH\ \rightarrow\ LiOH\ +\ NaF  

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double replacement

e)

Combustion

10.

Classify this reaction: 

 C2H8+4 O2 → 2 CO2 + 4 H2OC_2H_8+4\ O_2\ \rightarrow\ 2\ CO_2\ +\ 4\ H_2O  

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double replacement

e)

Combustion

11.

Classify this reaction: 

  Be+Cl2 →  BeCl2\ Be+Cl_2\ \rightarrow\ \ BeCl_2  

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double replacement

e)

Combustion

12.

According to the law of conservation of mass, what must be true in a reaction?

a)

The mass of the products must equal the mass of the reactants

b)

The number of atoms of each element must be equal on both sides

c)

The type of atom does not matter, just as long as there is an equal number of atoms on both sides

d)

In a closed system, mass will not be conserved

13.

Type what coefficient should be placed in front of calcium hydroxide:

 ? Ca(OH)2 +  Al2(SO4)3 → 3 CaSO4 + 2 Al(OH)3?\ Ca\left(OH\right)_2\ +\ \ Al_2\left(SO_4\right)_3\ \rightarrow\ 3\ CaSO_4\ +\ 2\ Al\left(OH\right)_3  



(a)  

14.
This chemical equation for mercury oxide is an example of what type of reaction?
2HgO  → 2Hg + O2
a)
decomposition reaction
b)
synthesis reaction
c)
combustion reaction
d)
Marvin the Martian reaction
15.
A chemical change in which a single compound breaks down into two or more simpler products is called a ______________________.
a)
single-replacement reaction
b)
synthesis reaction
c)
double-replacement reaction
d)
decomposition reaction
16.
A chemical change in which two or more substances react to form a new substance is a ____________________________.
a)
decomposition reaction
b)
synthesis reaction
c)
double displacement reaction
d)
combustion reaction
17.
This chemical equation for magnesium oxide is an example of what type of reaction?
2Mg + O2  → 2MgO
a)
decomposition reaction
b)
synthesis reaction
c)
single displacement reaction
d)
combustion reaction
18.
What type of chemical reaction is this one?
C2H2 + O2 --> CO2 + H2O
a)
Decomposition
b)
Combustion
c)
Synthesis
d)
Single Replacement 
19.
Why is Cl2 + KI → KCl + I2 not a synthesis reaction?
a)
Oxygen is not a reactant in this reaction.
b)
The reaction has more than one reactant.
c)
Oxygen is not a product in this reaction.
d)
The reaction has more than one product.
20.
What is the left part of a chemical equation called?
H2 + O → H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
21.
What is the right part of a chemical equation called?
H2 + O → H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
22.
What are the PRODUCTS of the chemical reaction pictured?
a)
CH4 and CO2
b)
CH4 and O2
c)
CO2 and H2O
d)
O2 and H2O
23.
Balance this equation...
H2 + Cl2 --> HCl
a)
It is balanced 
b)
3H2 + Cl2 --> 6H2Cl
c)
H2 + Cl2 --> 2HCl
24.
How many atoms of aluminum are on each side of the following equation: 4Al + 3O2 --> 2Al2 O3
a)
2
b)
6
c)
1
d)
4
25.

When energy like heat and light are given off in a chemical reaction it is called

a)

exothermic

b)

endothermic

c)

eccentric

d)

ectomorphic

26.

When energy is absorbed and taken in during a chemical reaction it is called

a)

exothermic

b)

endothermic

c)

eccentric

d)

ectomorphic

27.
What do we call a chemical substance made up of 2 or more different types atoms bonded together?
a)
formula
b)
atom
c)
subscript
d)
compound
28.
All ____________ are made up of two or more atoms bonded together.
a)
atoms
b)
molecules
c)
electrons
d)
elements
29.
H2O2← ?
This number tells the number of atoms present.
a)
coefficient
b)
molecule
c)
subscript
d)
atom
30.
→2H2O
This number tells how many molecules are in a chemical equation.
a)
coefficient
b)
subscript
c)
compound
d)
element
31.
2H2O
How many H2O molecules are present?
a)
1
b)
4
c)
2
d)
8
32.

Stores genetic information

a)

carbohydrates

b)

lipids

c)

proteins

d)

nucleic acids

33.

Source of quick energy

a)

carbohydrates

b)

lipids

c)

proteins

d)

nucleic acids

34.

Long-term storage of energy

a)

carbohydrates

b)

lipids

c)

proteins

d)

nucleic acids

35.

DNA and RNA

a)

carbohydrates

b)

lipids

c)

proteins

d)

nucleic acids

36.

Amino Acids

a)

carbohydrates

b)

lipids

c)

proteins

d)

nucleic acids

37.

Which of the following is a necessary component of an organic molecule?

a)

Phosphate

b)

Carbon

c)

Nitrogen

d)

Sulfur

38.
A producer?
a)
Eats other plants and animals
b)
Makes its own food
c)
Eats dead plants or animals
d)
Makes toys for kids
39.
A consumer?
a)
Makes its own food
b)
Eats dead plants and animals
c)
Eats plants and other animals for energy
d)
Buys toys for kids
40.
A decomposer?
a)
Eats dead plants or animals and breaks down to put nutrients in the soil
b)
Eats plants or other animals for food
c)
Makes its own food
d)
Machine that gathers trash
41.

What three things do plants need for the process of photosynthesis?

a)

Sunlight, oxygen, and sugar

b)

Water, soil, and oxygen

c)

Sunlight, carbon dioxide, and water

d)

Carbon dioxide, oxygen, and soil

42.

What are the structures inside plant cells that contain chlorophyll called?

a)

Nucleus

b)

Ribosomes

c)

Chloroplasts

d)

Lysosomes

43.

What color is chlorophyll?

a)

Red

b)

Blue

c)

Yellow

d)

Green

e)

Brown

44.

In a reaction A + B ----> C, reactant A has 5g and product C has 9g. How many grams does reactant B have?

a)

4g

b)

5g

c)

9g

d)

14g

45.
If reaction starts with 20g of reactants it should produce 
a)
a total of 40g of products
b)
a total of 10g of products
c)
a total of 80 g of products
d)
a total of 20g of products
46.

What are formed when water vapor condenses?

a)

Clouds

b)

Mountains

c)

Transpiration

d)

Valleys

47.

Which part of the water cycle is when water falls from the sky?

a)

Condensation

b)

Precipitation

48.
Which of the following removes carbon from the atmosphere?
a)
Combustion
b)
Respiration
c)
Photosynthesis
d)
Death
49.

Which describes the relationship between plants and animals in the carbon cycle?

a)

Plants produce and release oxygen that animals need

b)

Plants produce and release carbon dioxide that animals need

c)

Animals produce and release oxygen that plants need

d)

Animals produce oxygen that plants turn into carbon dioxide

50.

During the nitrogen cycle, through which structure are nitrogen compounds first absorbed into the plant?

a)

stem

b)

leaves

c)

roots

d)

flower

51.
What are the reactants of cellular respiration?
a)
glucose & carbon dioxide
b)
glucose & oxygen
c)
water & oxygen
d)
water & carbon dioxide
52.

What is the correct equation for cellular respiration?

a)

C6H12O6 + 6O2 -> 6CO2 + 6H2O + Energy

b)

6O2 + C6H12O6 + Energy -> 6CO2 + 6H2O

c)

6CO2 + 6H2O -> 6O2 + C6H12O6 + Energy

d)

6CO2 + 6H2O + Energy -> 6O2 + C6H12O6

53.

There are 25 elements found in living things. How many of these elements are found in some organisms but not all? (Hint: Think about how many elements are known as the building blocks of life?)

a)

1

b)

6

c)

19

d)

25

54.
Is this chemical formula Organic or Inorganic?
CHO2
a)
Organic
b)
Inorganic
55.
Organic compounds make up living things.
a)
False
b)
True
56.
a)
organic
b)
inorganic

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