Question

B) True / False : 1) The arrow In the word question shows the direction of the chemical reaction.
2)Opening of stomata is controlled by guard cells.
3)Moist air is necessary for rusting. 9) Liquids expand more than solids.
4) Non metals are good conductor of electricity and heat. ​

Answer 1

1) True

Ex - Fe2 + CuSO4 → FeSO4 + Cu

2) True

The guard cells close and open the stomata to let a substance in or out the stomata

3) True

Moist air contains water and oxygen, which are the essential substances for rusting.

4) False

Non Metals are bad conductors of heat and electricity. Like really bad

Do you think carbon will take electricity from the plug and charge your phone?

5) True

Liquids expand more than solids (upon heating)

Answer 2

Answer:

1)The arrow In the word question shows the direction of the chemical reaction.(false)

2)Opening of stomata is controlled by guard cells.(true)

3)Moist air is necessary for rusting.(true)

9)Liquids expand more than solids.(true)

5) Non metals are good conductor of electricity and heat. ​(false)

Explanation:

1) because that arrow shows that product of that reaction

2)The opening and closing of stomata are controlled by the guard cells. When water flows into the guard cells, they swell up and the curved surface causes the stomata to open. When the guard cells lose water, they shrink and become flaccid and straight thus closing the stomata.

3)Both the air and moisture are needed for the rusting of iron. The oxygen can't directly combine with iron. It uses water in moisture as a catalyst to increase the rate of reaction.

9)Liquids expand for the same reason, but because the bonds between separate molecules are usually less tight they expand more than solids. Heat causes the molecules to move faster, (heat energy is converted to kinetic energy ) which means that the volume of a gas increases more than the volume of a solid or liquid.

4)Non metals are good conductor of electricity and heat. ​A non-metal that is a good conductor of heat and electricity is Graphite (Carbon).