Question

B. Choose the correct options and fill in the blanks.
1. Equalising the number of atoms of each element on both sides in the equation is called
(balancing/modifying) the equation.
2. In a chemical reaction, the total mass of reactants is
(equal to/more
than) the total mass of the products.
3. Reactions that take place in the presence of sunlight are called .......
(endothermic/photochemical) reactions.
4. A chemical substance that can increase or decrease the speed of a reaction without itself
undergoing any chemical change is called a .......
....... (catalyst/product).
5. A downward arrow beside any product of a reaction indicates ........
(precipitate/gas) formation​

Answer 1

Answer:

4. A chemical substance that can increase or decrease the speed of a reaction without itself

undergoing any chemical change is called a .......

....... (catalyst/product).

Answer 2

Explanation:

5 precipitate

4 catalyst

3photochemical

2i think equal

make my answer brilliant