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Which naturally occurring radioactive element is most commonly used as fuel in nuclear power plants?

AGold

BSilver

CAluminum

DUranium

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What term describes the time it takes for half of a given sample of a radioactive substance to decay?

AFission point

BIsotope period

CDecay rate

DHalf-life

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What term describes atoms of the same chemical element that have the same number of protons but a different number of neutrons?

AIsomers

BMolecules

CIsotopes

DIons

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Dry ice, commonly used for cooling and creating fog effects, is the solid form of which substance?

AWater

BCarbon dioxide

CNitrogen

DAmmonia

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What term describes a chemical reaction that absorbs heat energy from its surroundings as it proceeds, such as photosynthesis?

AOxidation reaction only

BEndothermic reaction

CExothermic reaction

DCombustion reaction only

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What term describes a chemical reaction that releases heat energy into its surroundings, such as combustion?

AExothermic reaction

BEndothermic reaction

CNeutralization reaction only

DCatalytic reaction only

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How do carbon dioxide fire extinguishers work to put out flames?

ABy displacing the oxygen surrounding the fire, cutting off its fuel supply

BBy adding more fuel to burn the fire out quickly

CBy cooling the fire with extremely cold water

DBy chemically converting the fire into smoke

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Formalin, a solution containing formaldehyde, is commonly used for what purpose in laboratories and medical settings?

ATo preserve biological specimens and tissue samples

BAs a food sweetener

CAs a fuel source

DAs a fertilizer

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Naphthalene, the chemical compound traditionally used to make mothballs, has an unusual property of transitioning directly from which state to which state at room temperature?

AFrom solid to gas, a process called sublimation

BFrom liquid to gas

CFrom gas to liquid

DFrom solid to liquid only

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Silica gel packets, commonly found in packaging for shoes and electronics, serve what purpose?

AThey add a pleasant fragrance

BThey act as a fire retardant

CThey absorb moisture to help keep the contents dry

DThey prevent light from entering the package

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