WorksheetsChemical Reaction Quiz Review
Total questions: 20
Worksheet time: 10mins
Which of the following is evidence that a chemical reaction has occurred?
gas is formed
salt dissolves in water
ice melts
liquid changes to gas
Which of the following is an example of a chemical change?
evaporation
condensation
change in odor
melting
How many different elements are in this compound?
CaO
1
2
3
4
3NaCl
How many molecules of sodium chloride?
1
2
3
4
How many atoms of hydrogen?
H2O
1
2
3
4
How many atoms of Oxygen in this chemical formula?
Li2SO4
1
2
3
4
The type of reaction that releases energy in the form of heat or light is known as -
endothermic
exothermic
What type of chemical reaction absorbs energy? (feels cold)
endothermic
exothermic
Identify the reactants in this chemical equation.
H2 + O2
H2O
What are the products of this chemical equation?
H2 + O2
H2O
This is known as a -
NaCl
chemical equation
chemical formula
chemical symbol
How many atoms of Oxygen are in this formula?
Al2(SO3)3
6
2
9
3
How many atoms of Mg (magnesium) are in this chemical formula?
4Mg(OH)2
2
4
8
6
How many atoms of Li (lithium) are in this chemical formula?
4Li2O
8
6
2
4
Is this equation balanced?
Al2O3 ----> Al + O2
yes
no
Chemical equations must be balanced because of the -
Law of Conservation of Energy
Law of Conservation of Matter (mass)
Law of Conservation of Physics
I can change subscripts to balance a chemical equation.
true
false
To balance a chemical equation, I add coefficients infront of the chemical formula.
true
front
Which of the following is an example of a chemical change?
reacting two chemicals together and seeing the color change
ice melting
dissolving sugar into water
mixing salt and pepper
Chemical changes produce a new substance.
true
false
