Question

I have to make a presentation for science vacation homework so my mam give me questions if someone knows the answer please tell me
1;What do you know about chemical reactions?
2;Types of changes (physical/chemical)
3;Signs that a chemical change has occurred
4;parts of a chemical reactions
5;Use the chemical reactions in daily life
6;Evidence for a chemical reaction
This 6 are questions ​

Answer 1

Answer:

1. Chemical reaction is a process in which one or more substances, the reactants, are converted to one or more different substances, the products.

2. No new substances are formed in physical changes. Physical changes are generally reversible. Eg- melting of ice into water,  Dissolving sugar and water etc.

New substances are formed in chemical changes. Chemical changes are generally irreversible. Eg- burning of paper, cooking of food etc.

3. signs that a chemical change has occurred are :-

a. if a new substance is formed after the process of change.

b. If the change is irreversible.

c. a change in colour

4.  A chemical equation shows the starting compound(s)—the reactants—on the left and the final compound(s)—the products—on the right, separated by an arrow.

5. some examples of chemical reaction in our daily life are-

a. Photosynthesis

b. burning of wood

c. burning of paper

d. charring of sugar