Two states of matter are described below. State X: Particles are ions that are far apart State Y: Particles are molecules that a
re far apart Which combination of the state and a substance in that state is correct? State X = lightning; State Y = air State X = oxygen; State Y = neon State X = oxygen; State Y = water State X = air; State Y = milk Ben wrote the following examples of changes in substances.
Example A: Vegetables are chopped.
Example B: Food is broken up into simpler form during digestion.
Which statement is correct?
Both are examples of physical changes.
Both are examples of chemical changes.
Example A describes a physical change and Example B describes a chemical change.
Example A describes a chemical change and Example B describes a physical change.
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.
To we convert units for speed we can use dimensional analysis. First thing we do is seperate the measurement into a fraction. After this we can multiply by 1km over 0.62137 miles. We do this so that the miles cancel out.
× =
After this we can use a conversion factor and divide by 3.6.
