Chemical Reactions
Chemical reactions that give off heat are called...
Exothermic reactions
Which type of nuclear decay involves the splitting of a neutron?
Beta
Is a dust cloud a solution?
No
What salt is produced by the neutralization of HF and NaOH?
NaF
What happens to the forward and reverse reactions when a system reaches its equilibrium state?
The forward and reverse reactions both continue to occur at the same rate
The half-life of rubidium-88 is 4.58 hours. It goes through beta decay to become strontium-88. You start with a 92 gram sample of rubidium. How long will it take for 80.5 grams of strontium to form?
9.16 hours
Which freezes at a lower temperature, pure water or salt water? Why?
Salt water, because the vapor pressure is lower
Which acid is found in soft drinks?
Carbonic Acid
Which of the following occurs in a redox reaction?
One element gains electrons. Another element loses electrons
What is critical mass
The smallest amount of a substance needed to sustain a chain reaction
What happens to a solution’s boiling point as the concentration of solute increases?
It increases
What kind of reaction is a neutralization reaction?
Double-replacement
How many moles of hydrogen gas are needed in the following reaction? N2 + 3H2 ⇢ 2NH3
Three
What happens to the matter in a nuclear reaction?
It changes forms into energy
What is the solvent in a gas of lemonade?
Water
Which of the following compounds is the main component in mineral bath salts?
Magnesium sulfate
What decreases the rate of a reaction?
Inhibitor
Which of the following elements does the sun use as “fuel” in its fusion reactions?
Hydrogen
Concentration describes the….
Actual amount of solute for a given amount of solution
What do acids form in an aqueous solution?
Hydronium ions