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WorksheetsChemical Reations
Total questions: 36
Worksheet time: 18mins
What happens in a chemical reaction?
Atoms are destroyed.
Atoms are created.
Atoms are heated and cooled
Atoms are rearranged
In a balanced chemical equation, the mass of the reactants is equal to the
atoms in a molecule
atomic mass of the elements
volume of the reactants
mass of the products
The substance that is formed in a chemical reaction is called the
polymer.
reactant.
radical.
product.
A reaction in which the products contain more chemical energy than the reactants is
exothermic
electrical
endothermic
exergonic
A chemical equation is balanced by changing or adding
chemical symbols
subscripts
coefficents
reactants
A balanced chemical equation shows the proportions of reactants and products necessary for
the reaction to occur
matter to be conserved
energy use to be minamized
electrolysis to occur
A substance that undergoes a change in a chemical reaction is
a product
a chemical
a reactant
an enzyme
What is/are the product(s) in the following reaction?
2NH3 --> N2 + 3H2
NH3
N2
H2
both B and C
Which type of reaction is represented in the graph above?
hypothermic
exothermic
endothermic
hyperthermic
What coefficient is missing in C2H4 + (?)O2 --> 2CO2 + 2H2O?
2
3
4
5
Which of the following equations is not balanced?
Fe + S --> FeS
4Fe + 3Cl2 --> 2FeCl3
2Mg + O2 --> 2MgO
NaCl + 2F2 --> NaF2 + 2Cl2
Which of the following represents a double-displacement reaction between sodium chloride and silver fluoride?
NaCl + AgF --> NaAgF + Cl2
NaCl + AgF --> NaF + AgCl
NaCl + AgF --> Ag + NaClF
NaCl + AgF --> NaF + Cl2 + Ag
A synthesis reaction between magnesium (Mg) and oxygen (O2) might produce
Mg2
O4
MgO
MgCO2
A catalyst speeds up a chemical reaction by ____________ the activation energy needed
increasing
decreasing
eliminating
not changing
Which set of numbers below would be the correct coeffecients to balance the following chemical equation?
Na + H2O ---> H2O + NaOH
1,2,1,2
2,2,1,2
2,2,2,2
3,2,1,2
A car travelling 14 m/s comes to a stop in 3.5 seconds. What is the car’s acceleration?
0.25 m/s2
4.0 m/s2
-0.25 m/s2
-4.0 m/s2
A man has a mass of 80kg on earth. He travels to Mars where the acceleration due to gravity is 3.71 m/s2. What will his mass be on Mars?
297 kg
80 kg
297 kg
80 N
How many protons does an atom of Magnesium have (Mg)?
12
24.31
12.31
2
Which noble gas has 2 valence electrons?
H
Be
He
Ne
C-14 is an isotope of Carbon. How many neutrons does C-14 have?
6
12
8
14
What is the wavelength in the wave shown in the diagram above?
0.080m
0.060m
0.030m
not enough information to dertermine
The name dinitrogen tetroxide tells you that this compound contains
2 N atoms and 2 O atoms
4 N atoms and 2 O atoms
2 N atoms and 4 O atoms
4 N atoms and 4 O atoms
2NH3 --> N2 + 3H2
synthesis
decomposition
single-displacement
double-displacement
2NaCl + H2SO4 --> Na2SO4 + 2HCl
Synthesis
Decomposition
Single-displacement
Double-displacement
Fe + S --> FeS
synthesis
decomposition
single-displacement
double-displacement
2Li + 2H2O --> 2LiOH + H2
synthesis
decomposition
single-displacement
double-displacement
synthesis
decomposition
single-displacement
double-displacement
synthesis
decomposition
single-displacement
double-displacement
synthesis
decomposition
single-displacement
double-displacement
synthesis
decomposition
single-displacement
double-displacement
Antoine Lavoisier is credited with the
discovery of the law of conservation of
mass. This law states that in a chemical
reaction, matter is not created or destroyed,
but preserved. Which of the following
equations correctly models this law?
H2 + Cl2 --> 2HCl
2H2 + 2Cl2 --> HCl
H + Cl --> 2HCl
2H2 + Cl2 --> 2HCl2
The process by which hydrogen and oxygen form water can be classified as a ______________.
decomposistion
synthesis
precipitate reaction
single-displacement
The equation above is not balanced. In order to balance the equation, a coefficient of 2 needs to be placed directly
after the symbol for magnesium on the left side of the equation
before the symbol for oxygen on the left side of the equation
after the symbol for oxygen on the left side of the equation
before the symbol for magnesium on the left side of the equation
Which of these is NOT evidence of a chemical reaction?
An iron nail changes to a brownish-orange color
An ice cube melts into liquid water
An antacid tablet produces bubbles of gas when placed in water
A price of zinc raises the temperature of an acid as it reacts with it
The law of conservation of mass states that in a chemical reaction, the mass of the reactants equals the mass of the products. Based on this information, what mass of hydrogen (H2) was produced in the reaction shown below?
2 g
4 g
72 g
144 g
When a wood fire burns, it releases heat into the environment. This type of reaction is
endothermic
exothermic
catalytic
endergonic
