WorksheetsChemical Reactions and Types
Total questions: 15
Worksheet time: 10mins
The substances at the beginning or on the left of a chemical equation are called the __
atoms
products
reactants
compounds
In the equation, H2SO4 + Fe ---> H2 + FeSO4, which are the products?
H2SO4 and H2
H2 and FeSO4
H2SO4 and Fe
Fe and H2
What is the activation energy in a chemical reaction?
The energy needed to start a reaction.
The substances needed in a reaction.
The catalyst needed in a reaction.
The compounds needed to start a reaction
What do catalysts do in chemical reactions?
slows down the rate of reaction
speeds up the rate of reaction
change direction of the reaction
eliminate the energy in a reaction
Which is a catalyst of any chemical reaction?
energy
enzymes
elements
chemicals
How does a catalyst work in speeding up a reaction?
by making more catalyst available
by adding more energy during the reaction
By lowering the activation energy in the reaction
by increasing the activation energy in the reaction
The chemical reaction that releases heat or any energy is called
photosynthesis reaction
endothermic reaction
exothermic reaction
light reaction
The reaction that absorbs energy or stores energy during the process is called
endothermic reaction
exothermic reaction
electromagnetic reaction
magnetic reaction
Which can lower the value of the activation energy in a reaction?
changes in pressure
changes in temperature
presence of a catalyst
changes in the concentration of reactants
2Pb(NO3)2 --> 2PbO + 4NO2 + O2
What type of reaction is the equation above?
synthesis
decomposition
single replacement
double replacement
2Pb(NO3)2 --> 2PbO + 4NO2 + O2
Is the equation above balanced?
yes
no
cannot be determined
How many atoms of oxygen will be on both sides of the arrow when the following combustion reaction is balanced?
C6H14 + O2 → 6CO2 + 7H2O
7
14
19
38
Aluminum powder burns in oxygen to produce aluminum oxide. Which represents a correctly balanced equation of the reaction?
Al + O2 → Al2O3
2Al + 2O2 → Al2O3
4Al + 2O2 → 2Al2O3
4Al + 3O2 → 2Al2O3
Consider the following reaction:
Mg3P2 → Mg + P4
What coefficient would be in front of magnesium in a balanced version of this equation?
2
3
4
6
The equation below represents a balanced equation.
2NaHCO3(s) → Na2O(s) + H2O(g) + 2CO2(g)
Based on this equation, how do we know that a chemical reaction took place?
Gas was released.
A solution was produced.
A precipitate was produced.
A color change has occurred.
