Question

1.Artifical changes are controlled and performed by_____ .
2.______is formed when the gases oxygen and hydrogen combine chemically.
3.______changes are usually reversible in nature.
4. Changes that are not repeated at regular intervals in time are called______.
5. In burning wood,______ and_______ are formed.
6. Substance which increases the rate of a chemical change but does not undergo any change itself is called a _______.
7. Changing of milk into curd is a ______ change.

PLEASE GIVE RIGHT ANSWERS.​

Answer 1

Answer:

1] SCIENTIST

2] WATER

3] PHYSICAL

4] NON PERIODIC CHANGES

5] CO2 AND CO AND CH4

6] CATALYST

7] CHEMICAL

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