WorksheetsChemistry
Total questions: 10
Worksheet time: 2mins
Name
Class
Date
1.
What kind of change is a phase change?
a)
Physical - it's still the same substance
b)
chemical - it's made of chemicals
2.
A chemical change happens when...
a)
a substance is changed at the atomic level
b)
bonds are broken and formed
c)
a new substance is made
d)
all of the above!
3.
A catalyst
a)
is added to a reaction to make it slow down
b)
breaks apart and is changed
c)
provides an energetic short cut to the products
4.
Chemical Formulas ...
a)
are written in alphabetical order
b)
represent the destruction or creation of atoms
c)
represent how atoms are arranged in a chemical reaction
5.
The compounds or elements present at the end of a reaction
a)
reactants
b)
catalyst
c)
products
d)
energy
6.
The compounds and elements that are present at the beginning of a reaction:
a)
reactants
b)
catalyst
c)
products
d)
energy
7.
Which of the following reactions is a combustion reaction ?
a)
MgCO3 + O2 → MgO + CO2
b)
C3H8 + 5O2 → 3CO2 + 4H2O
c)
6CO2 + 6H2O → C6H12O6 + 6O2
d)
6CO2 + 6H2O → C6H12O6 + 6O2
8.
What is the law of Conservation of Mass?
a)
A measure of how much mass is created or destroyed.
b)
Mass can neither be created nor destroyed during a chemical reaction.
9.
Explain this graph
a)
A catalyst is used to speed up the reaction rate
b)
The catalyst provides a short cut to the products
c)
The red line shows how the catalyst saves energy
d)
All of these choices
10.
Which of the following is a decomposition reaction?
a)
MgCo3 --> MgO + CO2
b)
SO3 + H2O --> H2SO4
c)
2 Mg + O2 --> 2MgO
100 %
