kbh Reactions quiz PS

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