Explanation

Diamond is composed of the single element carbon, 

 it is the arrangement of the C atoms in the lattice that give a diamond amazing properties.

MUG 11-12-2022

ND5-07-2023

Explanation

Answer: 

C: Heating of Mercuric oxide powder: The heating of Mercuric oxide powder is a permanent change. We cannot get powder by revere reaction so it is a chemical change

Sublimation of Iodine: It is a physical change

Heating a platinum wire in a Bunsen flame: Platinum is a noble gas that cannot change its physical appearance after heating. So it is not a chemical change

Evaporation of Alcohol: It is a physical change. The liquid is changed into gas 

Explanation

The molecules are most tightly packed in solid state because of the strong intermolecular forces of attraction.

Explanation

In one year a mature tree will absorb more than 48 pounds of carbon dioxide from the atmosphere and release oxygen in exchange.

Explanation

Sublimation is the process in which a solid change directly into a gas.

Explanation

Most fruits produce a gaseous compound called ethylene that starts the ripening process.

Explanation

When fossil fuels are burned,

they release large amounts of carbon dioxide,

a greenhouse gas, into the air

.ND18-5-2023

Explanation

It is a highly unstable isotope of hydrogen.

Hydrogen has no neutron.

It contain only one proton and one electron.

But the deuterium contain one neutron and tritium contain two neurons,

these are the isotopes of hydrogen.

Explanation

The mass ratio of carbon to hydrogen in methane is 3:1.

methane formula:CH4 C:H 1:4

It requires 3 grams of Carbon for one gram of Hydrogen. So, for 36 grams of Carbon, we require 12 grams of Hydrogen.

Explanation

Global warming is increasing the surface of the earth.

It increases carbon dioxide, methane, and other greenhouse gases in the atmosphere.

ND-8-08-2023