Science Investigation

Chemical Reaction

Reaction that results in the formation of a new substance with different properties than the original substance.

Collision Theory

Collision theory explains that for a chemical reaction to occur, reactant particles must collide with sufficient energy and orientation

Rate of reaction

The rate of a chemical reaction is the speed at which reactants are converted into products

Factors that affect reaction rate

-temperature

-concentration

-surface area

-catalyst

Independant variable

Concentration of HCI, changing the concentration higher each trial

Dependant Variable

Volume of hydrogen gas, measured using a stopwatch (mL/m)

Control Variable #1

Surface area of a solid reactant

How you control the surface area?

Controlled by using the same mass for the experiment and making sure it has the same surface area

Why you controlled surface area?

because a larger surface area allows for more contact between acid and metal

Control variable #2

temperature

How you control temperature?

keeping experiment at same temperature and measuring it constantly

Why you control temperature?

higher temperature increases kinetic energy and makes more collisions

Control variable #3

total volume of solution

how you control total volume of solution

By adding water to the acid to reach the final volume

why you controlled total volume of solution

keeping total volume constant ensures concentration is the only factor being changed

Problems that occured during experiment

water and time