Rates of Reactions I

A chemical reaction always results in...

• reactants formed

• new product(s) formed

• explosions

• product(s) being used up

Which of the following is NOT a sign of a chemical reaction?

• colour change

• heat released

• melting

• bubbling

In an exothermic reaction, heat energy is...

(a)  

In an endothermic reaction, the temperature increases

• True

• False

Elements are substances made of only one kind of...

(a)  

Mixtures are made from

• molecules

• two or more elements bonded together

• two or more elements not bonded together

• compounds

Compounds are made from...

• mixtures

• two or more elements bonded toegther

• two or more elements not bonded together

• compounds

sodium + oxygen -->

(a)  

lithium + (a)   --> lithium oxide

Select all factors that can increase the rate of a chemical reaction

• temperature

• concentration

• particle size

• catalysts