15. What are the four macromolecules?

A. RNA, DNA, proteins and carbohydrates

B. Proteins, DNA, fats, and RNA

C. Proteins, nucleic acid, carbohydrates, and lipids

D. Monosaccharides, lipid, proteins

16. in order for a chemical reaction to occur, there must always be ?

A. an effective collision between reacting particles
B. abond that breaks in a reactant particle bond that forms in a product particle
C. decreasing the surface area of cooling the reaction mixture the reactants,
D. reacting particles with less energy

MAY ANSWER NAKO SA 17.

18. Raising the temperature increases a the frequency of collision the rate of a chemical reaction by increasing

a. the frequency of collision

b. the effectiveness of collision only

c. both frequency and effectiveness of collision

d.neither the frequency nor the effectiveness of collision

19. An increase in surface area of reactant will increase the rate of reaction because it

a. increase the energy of the particles

b. increase the number of particles available to react

c.increase the number of collisions between particles

d. increase the volume of the particles

20. Determine which condition will make
the reaction go faster.

a. Using of magnesium ribbon instead of powdered magnesium.

b. Increasing the temperature from 10°C to 40 °C.

c. Decreasing the concentration of
the reactants​