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- Q1
It lowers the activation energy of a reaction and increases reaction rate.
catalyst
product
inhibitor
equilibrium
30sSPS3a - Q2
A number placed in front of an element symbol or chemical formula in an equation
subscript
coefficient
reactant
product
30sSPS3b - Q3
A new substance made from a chemical reaction
reactant
product
inhibitor
superscript
30sSPS3b - Q4
A starting substance in a chemical reaction
equilibrium
coefficient
product
reactant
30sSPS3b - Q5
A substance that slows or stops a chemical reaction
equilibrium
inhibitor
precipitate
catalyst
30sSPS3a - Q6
A state in which forward and reverse reactants proceeds at equal rate
catalyst
inhibitor
equilibrium
precipitate
30sSPS3a - Q7
Which substance is the precipitate in the following reaction?
SiCl4 (l) + 2H20 (l) --> SiO2 (s) + 4 HCl (aq)
SiO2
SiCl4
H2O
HCl
30sSPS3b - Q8
In the chemical reactions leading to food spoilage, which role do food preservatives play?
reactant
inhibitor
catalyst
product
30sSPS3a - Q9
Which of these processes is endothermic?
exploding dynamite
iron rusting
burning wood
mixing Epsom salt in water
30sSPS3a - Q10
Magnesium reacts with oxygen and forms magnesium oxide is an example of a ___ reaction.
decomposition
synthesis
single replacement
double replacement
30sSPS3a - Q11
Hydrogen peroxide breaks down to form water and oxygen is an example of a _____ reaction.
double replacement
synthesis
decomposition
single replacement
30sSPS3a - Q12
All chemical reactions result in the formation of
substances with different colors.
substances with new chemical properties.
precipitates in liquids.
bubbles in liquids.
30sSPS3a - Q13
Which of the following represents a balanced equation?
Ag2S --> Ag + S8
CuCl2 + H2S --> CuS + HCl
2NaOH + H2SO4 --> Na2SO4 + 2H2O
C3H8 + 5O2 --> 3H2O + 3CO2
30sSPS3b - Q14
Which is a more reliable indicator that a chemical reaction has occurred?
bubbles
precipitate
color
odor
30sSPS3a - Q15
Which activity requires the least activation energy?
a cookie baking
a firecracker exploding
a bicycle rusting
a log burning
30sSPS3a