Worksheetskbh Reactions quiz PS
Total questions: 20
Worksheet time: 10mins
Which situation provides the best evidence that a chemical reaction is taking place?
A metal strip bends when heated
A solution freezes in the freezer
Two solutions mixed in a beaker produce a solid
A chemical is dissolved in water
To balance a chemical equation, it may be necessary to adjust the
Coefficients
subscripts
superscripts
change the compound
Which type of nuclear reaction (fission or fusion) involves combining nuclei?
fission
fusion
Which type of nuclear reaction (fission or fusion) involves splitting or dividing nuclei?
fission
fusion
A solid produced from two liquids in a chemical reaction is called a
reactant
precipitate
crystal
molecule
What happens during a chemical reaction? Select the most correct answer.
Bonds of reactants are broken
Atoms rearrange
New bonds form products
All of the choices describe a chemical reaction
Which type of nuclear reaction (fission or fusion) provides nuclear power?
fission
fusion
All of the actions below will increase the rate of a reaction EXCEPT
Putting the substance in a refrigerator
Putting the substance in an oven
Crushing the substance into tiny pieces
Stirring
Which type of nuclear reaction provides nuclear power?
fission
fusion
If heat is absorbed from a chemical reaction when the reaction takes place, the reaction is
exothermic
endothermic
Substances that speed up chemical reactions are called
reactants
products
inhibitors
catalysts
Which type of reaction is Fe + O2 → Fe2O3 ?
synthesis
decomposition
single replacement
double replacement
combustion
Which type of reaction is Ag + H2S → Ag2S + H2 ?
synthesis
decomposition
single replacement
double replacement
combustion
Which type of reaction is a. CH4 +O2 → CO2 + H2O?
synthesis
decomposition
single replacement
double replacement
combustion
Which type of nuclear reaction (fission or fusion) provides solar energy for our planet?
fission
fusion
Which type of reaction is NaCl + KOH --> NaOH + KCl?
synthesis
decomposition
single replacement
double replacement
combustion
In a chemical equation, the symbol that means dissolved in water is
(s)
(l)
(g)
(aq)
The Law of Conservation of Mass states
Mass never stays constant
Mass is always added during a chemical change
Mass is always lost during a chemical change
Mass is not lost or created during a chemical change
Which of the following observations does NOT indicate that a chemical reaction has occurred?
Formation of a precipitate
Production of a gas
State of matter change
Heat and light released
How many atoms of oxygen are represented in Ca(NO3)2 ?
3
6
10
12
