What occurs in a chemical reaction?

products are formed from reactance by the breaking and forming of new bonds

products are formed without Chemical bonds being broken

reactants are formed without chemical bonds being broken

reactants are formed from products by breaking and forming of bonds

Products are formed from reactants by the breaking and forming of new bonds during a chemical reaction.

Explanation:

In chemical reactions, the bond that is present between the atom of reactants is first broken and after that new bonds are formed between product. For example,

HCL + NaOH >>>>> Nacl + H2O

In the above reaction, bond between hydrogen and chlorine and the bond between sodium and hydroxide is broken and the bond between sodium and chlorine and the bond between hydrogen and hydroxide is formed.

- aluminum and copper chloride.

- the chloride ion to separate the aluminum from the oxygen so that the aluminum can react with the copper ions (and the water molecules).

a: 45.9 meters

b: 4.29 seconds

step-by-step explanation:

a: h(t)=1/2(-9.8)(3)^2+0(3)+90

h(t)=-4.9(3)^2+90

h(t)=-44.1+90

h(t)=45.9 meters

b: 0=1/2(-9.8)(t^2)+0t+90

0=-4.9t^2+90

-90=-4.9t^2

18.37=t^2

t=4.29 seconds

in the second question, the numbers aren't exact, but they're a close approximation.