1ST PART (PG 72 - 74) Excluding Activity

Question 1

What are noble gasses? State all of them as examples.

Answer 1

Noble or inert gasses are gases, which are non reactive to any of the elements present. Their examples are: helium, Argon, Neon, Radon, Xenon, and Krypton.

Question 2

What are non metals? What are they used for? Give 5 examples.

Answer 2

Non metals are elements, which of them mostly help us in survival. their applications are: like oxygen helps all the living organisms survive through breathing, carbon dioxide is needed by plants to conduct photosynthesis, and nitrogen forms form 78% of the air in free state and also creates a food nutrient vital to humans known as proteins. Their examples are: oxygen, carbon, nitrogen, Sulphur, and hydrogen.

Question 3

As we have learnt that seawater is a major source of metals, can you name the metals it has in the form of salts.

Answer 3

Magnesium, Potassium, Calcium, and Sodium.

Question 4

The most abundant metalloid in Earth’s crust is _____________.

Answer 4

Silicon

Question 5

The most abundant metal in Earth’s crust is _________________.

Answer 5

Aluminum

Question 6

Which metals are found in free state because they are not reactive?

Answer 6

Gold and platinum.

Question 7

The most abundant non metal in Earth’s crust is __________.

Answer 7

Oxygen

Question 8

What are metals? What are they used for? Give 5 examples.

Answer 8

Metals are elements, they are lustrous,, they are strong, they are sonorous, and they can form alloys. They’re mostly used for making utensils, weapons, ornaments, and machines. the five examples are: gold, silver, platinum, aluminum, and iron.

Question 9

Name all the non metals:
(Formula - Hannah only needs calcium fiber’s chocolate brownie in seven packets ASAP)

Answer 9

Hydrogen, Oxygen, nitrogen, carbon, fluorine, chlorine, bromine, iodine, sulfur, phosphorus, astatine.

Question 10

Which is the second most abundant metal in earth’s crust?

Answer 10

Iron

Question 11

The most abundant element in the Earth’s crust. Mention its type.

Answer 11

Oxygen - Non Metal

Question 12

Nitrogen forms ______% of air in ________ state.

Answer 12

a) 78%
b) Free

Question 13

Which metals are found in free state due to their low reactivity.

Answer 13

Mercury, Silver and Copper.

Question 14

Non metals are very ___________ as compared to metals.

Answer 14

Less

Question 15

The second most abundant element in the Earth’s crust. Mention its type.

Answer 15

Silicon - Metalloid

Question 16

What are metalloids? State 3 examples.

Answer 16

Metalloids are elements, which have some properties of metals and some of non metals. it’s examples are silicon for germanium, and antimony.

Question 17

In atmosphere, non metals occur both in free state as ___________, and _________ moreover, in combined state as _________, and ____________.

Answer 17

a) Oxygen, and nitrogen
b) Carbon Dioxide, and water

Question 18

Which is the second most abundant non metal in earth’s crust?

Answer 18

Nitrogen

Question 19

Which metal was the first metal to be discovered by mankind?

Answer 19

Copper

Question 20

As we know that there are millions of substances in this world but they all are made up of a limited number of _____________.

Answer 20

Elements

Question 21

Non metals occur in earth’s crust in a ___________ state as ______________, _______________, ______________, and _____________.

Answer 21

a) Combined
b) Oxides, Carbonates, Sulphates, and Nitrates

Question 22

The third most abundant element in the Earth’s crust. Mention its type.

Answer 22

Aluminum - Metal