Answer:
lower,emitted
Explanation:
when electron changes level, it decreases energy and emits photon.
photon is emitted when it goes from higher to lower energy level
<h2>
Answer: Calcium Oxide and Calcium Hydroxide</h2>
Explanation:
To reduce the acidity of the soil, bases are used.
Calcium Oxide and Calcium Hydroxide are two such bases that are often used.
Answer 1 : State X is lightening and state Y is air.
Explanation:
Lightening is a phenomena which occurs due to electrostatic interaction between negatively charged ions and positively charged ions present in atmosphere.
Air is composed of various molecules of gases.
Answer 2: Third statement is correct.
Explanation:
When the vegetables are chopped change in shape of the vegetables that is physical change takes place.
When food is broken down into simpler form during digestion, chemical change takes place. During digestions the chemical composition of food changes as it was broken down into simpler molecules.