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4/10 Chemistry Review

Total questions: 38

Worksheet time: 29mins

Name
Class
Date
1.
Question Image

Match the following

a)

Reactant

Element

1.

2C2

b)

Reactant

Compound

2.

CH4

c)

Product

Compound

3.

CO2

2.

P4O10 had a mass of ​12g , and H3PO4 has a mass of 90g, accroding t the law of conservation of mass what is H2O mass? ​ ​ (a)  

Choose from the below words
78g
102
102g
90g
12g
3.
How many elements does PbNO3 have?
a)
2
b)
3
c)
4
d)
5
4.
How many nitrogen atoms does NH3 have?
a)
1
b)
2
c)
3
d)
4
5.
A chemical equation tells us 
a)
the reactants and the products.
b)
the elements that make up the reactants and the products.
c)
the number of atoms that make up the reactants and the products.
d)
All of the above.
6.
What is the reactant in the following equation?
2NaHCO3  -> Na2CO3  +  CO2  + H2O
a)
NaHCO3
b)
Na2CO3
c)
CO2
d)
H2O
7.
Which of the following describes the law of conservation of mass?
a)
In a reaction, atoms are created or destroyed.
b)
In a reaction, atoms are not lost or made.
c)
In a reaction, the mass of the product may be more or less than the reactants.
d)
In a reaction, mass never stays the same.
8.
For the equation:
2H2 +  O2 --> 2H2O
How much H2O will be produced if we react 4g of H2 and 32g of O2?
a)
4g
b)
32g
c)
36g
d)
28g
9.
Which  of the following is a balanced equation?
a)
Na   +   Cl2   -->  NaCl
b)
H2  +  O2  --> H2O
c)
Ca   +   Br  -->  CaBr2
d)
Na   +  F  -->  NaF
10.

The number to the lower side of an element is a  (H2O)

a)
Subscript
b)
Superscript
c)
Coefficient
d)
Charge
11.

The number in front of a compound or element is a  (3H2O)

a)
Subscript
b)
Coefficient
c)
Superscript
d)
Charge
12.
Matter can not be created nor destroyed: it can only be
a)
Destroyed a little bit
b)
Invisible
c)
Transformed, changed
d)
None of the above
13.
A chemical reaction is balanced when
a)
both sides have the same elements
b)
Both sides have the same  number of atoms
c)
Same subscripts
d)
Same coefficients
14.
Which of these is not a chemical reaction?
a)
Burning of wood
b)
Milk going bad
c)
Mixing vinegar and baking soda
d)
Melting of ice
15.
A precipitate is a 
a)
liquid that forms when two solids are reacted
b)
a solid that forms when two liquids are mixed
c)
a gas that forms when vinegar and baking soda react
d)
a change of color in a solution
16.
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
17.

How many atoms do you have in the compound 2MgCl2?

a)

2 atoms

b)

4 atoms

c)

6 atoms

d)

8 atoms

18.

How many Ca (Calcium) atoms are found in Ca(OH)2?

a)

5 atoms

b)

3 atoms

c)

2 atoms

d)

1 atom

19.

Law of conservation of mass states the amounts of atoms in the reactants and the products...

a)

Increase

b)

Decrease

c)

Stay the same

d)

No correct answer

20.

Metals are shiny, good conductors, malleable, and ductile.

a)

True

b)

False

21.

When describing physical properties of elements the term shiny is scientifically described as

a)

pretty

b)

lustrous

c)

sleek

22.

Metalloids have the same properties as

a)

metals.

b)

nonmetals.

c)

neither, they are a combination of both.

23.

Metals are mostly found on which side of the periodic table?

a)

Left

b)

Right

24.

Non metals are mostly found on which side of the periodic table?

a)

Left

b)

Right

25.

Is a rusting bicycle a chemical or physical change

a)

chemical

b)
physical
26.

Is glass breaking a chemical or physical change?

a)
chemical
b)
physical
27.
Is melting ice a chemical or physical change?
a)
chemical
b)
physical
28.
Salt dissolves in water
a)
physical Change
b)
chemical change
29.

When mixing milk and vinegar, a white, chunky, solid substance is formed. What has occurred?

a)

Physical change: state of matter

b)

Chemical change: precipitate

c)

Physical change: freezing

d)

Chemical change: new gas

30.

Boiling Water

a)

Physical Change

b)

Chemical Change

31.

Match the following

a)

Physical change

(Shape)

1.

Cutting paper

b)

Physical change

(solubility)

2.

Dissolving

Kool-Aid

c)

Chemical Change

(Flammability)

3.

Lighting a match

d)

Chemical Change

4.

Creating a new substance

e)

Both a Physical & Chemical change

5.

Bubbles

32.

Choose the best description below for the image

a)

physical change

b)

chemical change

33.

Which of the observations of fireworks does NOT indicate that a chemical change has occurred?

a)

Many colors are produced

b)

Bright light is given off

c)

Smoke is produced

d)

Heat is released

e)

Loud sounds are produced

34.

Which of the following is an indicator of chemical change?

a)

Change in shape with the application of some type of force

b)

Change in temperature with no outside heat source applied

c)

The formation of a solid due to freezing

d)

The formation of a gas due to evaporation

35.

Which of these observations from a burning candle are NOT evidence of a chemical change?

a)

The wax is melting

b)

Smoke is produced

c)

Heat is released

36.

________ are the starting substances in a chemical equation.

a)

Reactants

b)

Producer

c)

Reaction

d)

Products

37.

The law of conservation of mass states that ________

a)

the total mass of reactants is more than the total mass of products

b)

the mass of a chemical reaction is not constant

c)

the mass of a chemical reaction remains constant

d)

the total mass of reactants is less than the total mass of products

38.
When CaCO3 is heated, it forms CaO and CO2. Which of these statements best describes the mass of the products if 100 g of CaCO3 is heated?
a)
The difference in the products’ masses is equal to the mass of the CaCO3
b)
The sum of the products’ masses is less than the mass of the CaCO3
c)
The mass of each product is equal to the mass of the CaCO3
d)
The sum of the products’ masses equals the mass of the CaCO3

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