1: if we have any substance, can be concluded that a chemical if has happed - A . there is a color change
B. the state of matter change
C. there is a decrease in mass.
D. the matter is stirred thoroughly

Iknow the answer to 13 is b and 14 is d. i just need to know why the correct answers are correct

An electrons position cannot be known precisely only it's probability of being in a certain location can be known

Write the formula for the following chemicals. 7. e. trinitrogen tetraoxide a calcium phosphate f. magnesium acetate b. potassium sulfide g nickel(iii) cyanide c carbon dioxide h. silver sulfate d. cobalt(ii) chloride