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WorksheetsChemical Reactions Review
Total questions: 17
Worksheet time: 9mins
In a chemical reaction:
The atoms of the reactants always stay together to form the products
The atoms of the reactants unbond, rearrange, and then rebond to form the products
New atoms are formed which combine to make the products
Some atoms disappear while others multiply to form the products
In a chemical reaction, mass is conserved. This means that
The mass of the reactants stays the same during a chemical reaction
The mass of the products stays the same during a chemical reaction
The type and number of atoms in the reactants equals the type and number of atoms in the products
The mass of the products is always twice the mass of the reactants.
If the reactants on the left side of a chemical equation are C3H8 + 5O2, the products should be
4CO2 + 3H2O
3CO2 + 4H2O
2CO2 + 3H2O
3CO + 4H2O
A precipitate is formed when
Two liquids react and a gas is produced
One liquid dissolves in another
A solid dissolves in a liquid
Two liquids react and a solid is formed
In a chemical reaction, if the reactants are heated, the reaction usually happens
slower
faster
same rate
in a different volume
The purpose of a catalyst is to:
speed up a reaction
slow down a reaction
create more reactants
stop the reaction
If two substances react and the temperature of the mixture decreases, the reaction is
Exothermic
Endothermic
Idon'tknowthermic
Nocluethermic
If a reaction is endothermic
The temperature increases
It takes more energy to break bonds of reactants than is released when bonds in products are formed
More energy is released when bonds in products are formed than is used to break bonds in reactants
Same amount of energy is used to break bonds of reactants as is released when bonds in products form
When the pH of a solution becomes more acidic, the number on the pH scale
goes up
goes down
stays the same
it depends
When the pH of a solution becomes more basic, the concentration of H3O+ ions
goes up
goes down
stays the same
depends
What is sodium carbonate?
epsom salt
vinegar
baking soda
washing soda
What is sodium bicarbonate?
Baking soda
Washing soda
epsom salt
vinegar
What is acetic acid?
vinegar
baking soda
bleach
epsom salt
Is the equation balanced?
SnO2 + 2 H2 → Sn + 2 H2O
Yes
No
Which of these are chemical reactions?
dissolving salt in water
dry ice
combining sodium bicarbonate and acetic acid
decomposition of hydrogen peroxide
The left side of the chemical equation are called the ________.
products
reactants
platypus
molecules
What is needed to break bonds and also released when bonds are broken?
energy
bananas
atoms
electrons
