Chemical Reaction

What is the law of conservation of mass?

• Matter can be created and destroyed in a chemical reaction.

• Matter cannot be created or destroyed in a chemical reaction.

• The total mass of reactants is always greater than the total mass of products.

• Mass is only conserved in physical changes, not chemical reactions.

What are the substances used to form a chemical reaction?

• Reagents

• Catalysts

• Chemicals

• Solvents

Which of the following is a mixture?

• Salad without dressings.

• Pure water.

• Oxygen gas.

• Table salt.

What is an indicator of a chemical reaction?

• Color change, gas production, or temperature change.

• Change in mass only.

• No change in color or temperature.

• Formation of a solid only.

What does it mean for a substance to dissolve?

• To mix a solid into a liquid until it becomes part of the liquid.

• To heat a solid until it turns into gas.

• To combine two liquids to form a solid.

• To separate a solid from a liquid by filtration.

What is a reactant?

• A substance that undergoes change in a chemical reaction.

• A product formed after a chemical reaction.

• A catalyst that speeds up a chemical reaction.

• A mixture of two or more substances.

What is a solute?

• The substance that is dissolved in a solution.

• A liquid that dissolves a solute.

• A mixture of two or more substances.

• A solid that cannot dissolve in any liquid.

What is a mixture?

• A combination of two or more substances that retain their individual properties.

• A single substance that cannot be separated into its components.

• A solution where one substance is dissolved in another.

• A chemical reaction between two or more elements.

What is a chemical reaction?

• A process where substances (reactants) transform into new substances (products).

• A method of mixing chemicals without any change.

• A technique used to measure the temperature of substances.

• A way to separate mixtures into their individual components.

What is a solution?

• A mixture of a solid and a liquid where the solid dissolves into the liquid.

• A combination of two or more solids that do not mix.

• A liquid that contains no dissolved substances.

• A gas mixed with a liquid to form a foam.