Chemistry EOY

What is a chemical reaction?

• A process where physical states of substances are altered

• A process where substances undergo a chemical change to form new substances

• A process where substances are mixed without changing their chemical structures

• A process where only the temperature of substances is changed

Which of the following is an example of a physical change?

• Dissolving sugar in water

• Burning of wood

• Rusting of iron

• Freezing of water into ice

What is a reactant in a chemical reaction?

• A substance that is unchanged in the reaction

• A substance that is used up in the reaction

• A substance that appears as a result of the reaction

• A catalyst that speeds up the reaction

What does the arrow in a chemical equation represent?

• The direction of physical change

• The transfer of electrons

• The yield or result of the reaction

• The conservation of energy

What is a product in a chemical reaction?

• A substance that initiates the reaction

• A substance that is used up to start the reaction

• A new substance formed as a result of the reaction

• A byproduct that is not important

What type of chemical reaction involves one compound reacting to form two elements ?

• Decomposition reaction

• Combustion reaction

• Synthesis or Combination reaction

• Double displacement reaction

Which type of reaction is characterized by a single element replacing another in a compound?

• Combustion reaction

• Synthesis or Combination reaction

• Decomposition reaction

• Single displacement reaction

What type of chemical reaction is represented by the equation A + B → AB?

• Decomposition reaction

• Combustion reaction

• Synthesis or Combination reaction

• Double displacement reaction

What happens in a single replacement reaction?

• Two compounds react to form two new compounds

• One element replaces a similar element in a compound

• A compound breaks down into simpler substances

• Two elements combine to form one compound

What type of energy does a bicyclist have at the top of a hill?

• Kinetic energy

• Thermal energy

• Potential energy

• Chemical energy