chemistry and experimental design

Law of Conservation of Mass

The total mass of the reactants equals the total mass of the products in a chemical reaction.

common properties of non-metals

They are typically dull, are poor conductors of electricity and heat, and are brittle.

common properties of metals.

They typically have high luster, are good conductors of electricity and heat, and are malleable and ductile.

increase the rate of a chemical reaction using collision theory.

Increase surface area, concentration, or temperature.Also involves using catalysts.

ndependent variable?

The variable that is manipulated or changed by the researcher.

dependent variable?

The variable that is measured or observed in response to changes in the independent variable.

controlled variables?

Variables that are kept constant to prevent them from affecting the dependent variable.