Periodic table and Chemical reactions

Question 1

What are elements in group 7 of periodic table called?

Answer 1

Halogens

Question 2

What are elements in group 8 of periodic table called?

Answer 2

Nobel Gases

Question 3

What are elements in group 1 of periodic table called?

Answer 3

Alkali Metals

Question 4

The metals between groups 2 and 3 are called the

Answer 4

Transition metals

Question 5

What is the advantage of using symbols for the elements rather than their names?

Answer 5

So all the discussions about the chemicals are the same whatever the language spoken by the chemist

Question 6

What are the properties of metals?

Answer 6

Conductor of electricity, Good conductor of heat, Shiny appearance(metallic lustre), Malleable (can be beaten into sheets), Ductile (can be drawn into wires)

Question 7

What are the properties of non-metals?

Answer 7

Non - conductor of electricity, Poor conductor of heat, Dull appearance, Brittle

Question 8

the columns going down the periodic table are called

Answer 8

groups

Question 9

the rows going across the periodic table are called

Answer 9

periods

Question 10

What is a compound?

Answer 10

A chemical compound is any substance composed of two or more chemical elements chemically bonded together.

Question 11

What is a mixture?

Answer 11

Two or more elements or compounds mixed together which can be easily separated.

Question 12

Why does a compound weigh more than an element?

Answer 12

The mass of a compound is the sum of the masses of all the atoms it contains. Since compounds consist of multiple types of atoms, their combined atomic masses are greater than the atomic mass of an individual element.

Question 13

what is an element?

Answer 13

Is a substance made of only one type of atom

Question 14

What is always at the centre of a word equation?

Answer 14

an arrow (not = sign)