Chemical Reactions

What is a chemical reaction?

• A process where substances are transformed into new substances.

• A method of separating mixtures into their components.

• A technique used to measure the pH of a solution.

• A way to increase the temperature of a substance.

What is an example of a physical change?

• Melting ice is an example of a physical change.

• Burning wood is an example of a physical change.

• Rusting iron is an example of a physical change.

• Mixing sand and salt is an example of a physical change.

What is a reactant?

• A substance that undergoes a chemical change in a reaction.

• A product formed after a chemical reaction.

• A catalyst that speeds up a chemical reaction.

• A mixture of two or more substances that do not react.

What is a molecule?

• A molecule is made of more than one atom.

• A molecule is a single atom.

• A molecule is a type of chemical bond.

• A molecule is a large structure made of cells.

What is density?

• Density is the mass of a substance divided by its volume.

• Density is the weight of a substance multiplied by its volume.

• Density is the volume of a substance divided by its mass.

• Density is the mass of a substance plus its volume.

What is an atom?

• A molecule made of two or more atoms.

• The smallest unit of matter that retains the properties of an element.

• A type of subatomic particle found in the nucleus.

• A large structure made of cells.

What are the properties of matter?

• Magnetism

• Density

• Temperature

• Volume

What is a catalyst?

• A substance that slows down a chemical reaction.

• A substance that helps a chemical reaction happen faster without being consumed in the process.

• A type of chemical that is always consumed in a reaction.

• A mixture of different chemicals that enhances reaction rates.

What kind of scientist studies chemical reactions to form new chemicals?

• A materials scientist

• A physicist

• A biologist

• An environmental scientist

What is a product in a chemical reaction?

• A substance that is formed as a result of a chemical reaction.

• A substance that is consumed during a chemical reaction.

• A catalyst that speeds up the reaction.

• A mixture of reactants before the reaction occurs.