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Nature of Matter Law of Conservation of Matter 2025

Total questions: 32

Worksheet time: 25mins

Name
Class
Date
1.
How many elements are in C6H12O6?
a)
1
b)
2
c)
3
d)
4
2.
How many atoms of carbon (C) are in C6H12O6?
a)
3
b)
6
c)
12
d)
24
3.
Element or compound?
H2O
a)
element
b)
compound
4.
Which of the following is a compound?
a)
Co
b)
O2
c)
C
d)
CO2
5.
Which is the correct formula for:
 three hydrogen (H)
one sulfur (S)
four oxygen (O)
a)
H3SO4
b)
HSO4
c)
H4S3O
d)
H2O
6.
The red numbers in the image below represent ________
a)
subscripts
b)
coefficients
c)
I don't know, and don't want to try
d)
None of the answers are correct
7.
In a chemical reaction, everything to the rightof the arrow is called ______________.
a)
Products
b)
Yields
c)
Molecules
d)
Reactants
8.
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
9.
Is the following equation balanced or unbalanced?
Fe + S --> FeS
a)
balanced
b)
unbalanced
10.
How many atoms are there TOTAL in:
H2SO4
a)
6
b)
5
c)
7
d)
3
11.
Number of H in 3(NH₄)₂CrO₄
a)
4
b)
2
c)
8
d)
24
12.
In chemical reactions, what does the principle of conservation of mass mean?
a)
Matter is not created or destroyed.
b)
The total mass of the reactants is greater than the total mass of the products.
c)
The total mass of the reactants is less than the total mass of the products.
d)
Matter is not changed.
13.
 Fill in the blank to balance the chemical equation. 
2KI  +  ____Cl2 →  2KCl  +  I2
a)
1
b)
2
c)
3
d)
4
14.
calcium phosphate
a)
CaPO4
b)
Ca2(PO4)3
c)
Ca3PO4
d)
Ca3(PO4)2
15.
Which of the following shows the correct way to balance the chemical equation?
Fe + O2 -> Fe2O3
a)
4Fe + 3O2 -> 2Fe2O3
b)
2 Fe + 3O2 -> Fe2O6
c)
4 Fe + O6 -> 2Fe2O3
d)
None of the options are correctly balanced.
16.
Are the atoms more stable when they are bonded together or when they are apart? 
a)
Bonded Together
b)
Apart
17.
What do atoms that form positive ions tend to do?
a)
Tend to lose electrons 
b)
Tend to lose protons
c)
Tend to gain electrons
d)
Tend to gain protons
18.
What happens when the sodium atom loses an electron?
a)
It become negatively charged 
b)
It become positively charged
c)
none
19.
Covalent compounds
a)
Share electrons
b)
transfer electrons
c)
contain a sea of electrons
d)
conduct electricity
20.
What happens when an atom loses an electron?
a)
Neutral (no charge)
b)
Positive charge
c)
Negative charge
21.
What charges attract?
a)
Opposite
b)
Same
22.
What charges repel?
a)
Same
b)
Opposite
23.
What is the number of valence electrons for Oxygen?
a)
8
b)
6
c)
2
d)
1
24.
What is the number of valence electrons for Beryillum?
a)
1
b)
4
c)
2
d)
7
25.

2KClO3 ---->2KCl + 3Os

a)

synthesis reaction

b)

decomposition reaction

c)

single replacement reaction

d)

double replacement reaction

26.

2HCl + 2NaOH -----> NaCl + H2O

a)

synthesis reaction

b)

decomposition reaction

c)

single replacement reaction

d)

double replacement reaction

27.

Mg + 2HCl ----> MgCl2 + H2

a)

synthesis reaction

b)

decomposition reaction

c)

single replacement reaction

d)

double replacement reaction

28.

AgNO3 + KCl ----> AgCl + KNO3

a)

synthesis reaction

b)

decomposition reaction

c)

single replacement reaction

d)

double replacement reaction

29.

N2 + 3H2 ----> 2NH3

a)

synthesis reaction

b)

decomposition reaction

c)

single replacement reaction

d)

double replacement reaction

30.

2H2O2 -----> 2H2O + O2

a)

synthesis reaction

b)

decomposition reaction

c)

single replacement reaction

d)

double replacement reaction

31.

SO3 + H2O ----> H2SO4

a)

synthesis reaction

b)

decomposition reaction

c)

single replacement reaction

d)

double replacement reaction

32.

SO3 + H2O ----> H2SO4

a)

synthesis reaction

b)

decomposition reaction

c)

single replacement reaction

d)

double replacement reaction

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