Chemical Reactions & Properties Quiz

What is a chemical reaction?

• A chemical reaction is a biological process.

• A chemical reaction is a physical change in matter.

• A chemical reaction is a process that leads to the transformation of one set of chemical substances to another.

• A chemical reaction is a mathematical equation.

Give an example of a reversible reaction.

• Photosynthesis

• Rusting of iron

• Formation of water from hydrogen and oxygen gas

• Combustion of wood

Explain the difference between a physical change and a chemical change.

• Physical changes involve a change in color, while chemical changes involve a change in state.

• Physical changes are reversible and do not involve the formation of new substances, while chemical changes are irreversible and result in the formation of new substances.

• Physical changes are irreversible and result in the formation of new substances, while chemical changes are reversible and do not involve the formation of new substances.

• Physical changes always involve a change in temperature, while chemical changes do not.

What are the properties of a substance?

• Color and shape

• Taste and smell

• Size and weight

• Physical and chemical characteristics

How do thermal conductors differ from electrical conductors?

• Thermal conductors transfer heat, while electrical conductors transfer electricity.

• Thermal conductors transfer electricity, while electrical conductors transfer heat.

• Thermal conductors do not transfer any form of energy, while electrical conductors transfer electricity.

• Thermal conductors transfer light, while electrical conductors transfer sound.

Describe an experiment to test the conductivity of a material.

• Submerge the material in water and observe if it floats or sinks

• Set up a circuit with a power source, wires, the material to be tested, and a light bulb or multimeter. Pass electricity through the material and observe if the light bulb lights up or the multimeter shows a reading.

• Rub the material with a magnet to test its conductivity

• Place the material in a microwave and see if it heats up

What happens during a chemical reaction at the molecular level?

• Electrons change color

• Atoms disappear and reappear

• Bonds between atoms are broken and new bonds are formed.

• Molecules are created out of thin air

How can you identify if a reaction is reversible?

• Check if the reaction can proceed in both the forward and reverse directions by observing if the products can react to form the original reactants.

• Determine if the reaction rate is slow

• Check if the reaction produces a single product

• Observe if the reaction only occurs in one direction

Give an example of a substance that is a good thermal conductor.

• Copper

• Rubber

• Wood

• Plastic

What does the temperature at which a substance changes state represent?

• Its density

• Its volume

• Its property

• Its color