Which of the following increases the chance of a reaction when two
molecules collide?
o
a. increasing the concentration of the molecules
o
b. increasing the activation energy of the reaction
o
c. decreasing the temperature of the system
o
d. slowing down the speed of the molecules

C. Decreasing the temperature of the system.

Explanation:

Decreasing the temperature of the system increases the chance of a reaction when two  molecules collide.

they are both synthetic elements

explanation:

d

answer is: naturally occurring solid, inorganic compound or element is mineral.

minerals usually have crystalline form, that means than crystal constituents (atoms, molecules or ions) are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions.

for example magnetite is a mineral of iron oxide (fe₂o₃).

calcite is a carbonate mineral and the most stable polymorph of calcium carbonate (caco₃).

dolomite is an   carbonate mineral composed of calcium magnesium carbonate (camg(co₃)₂).