8th chem

munira teacher

100

What common fruit is made out of barium and 2 sodium?

BaNaNa

200

How many neutrons are present in 1 atom of chlorine - 35.5

18

300

Element which is always liquid at the room temperature 

Mercury/Bromine

400

The tendency of atoms to make the number of their valence electrons 8 is called...

Octet rule

500

Write the electron configuration of Mg

(Atomic number = 12, Atomic mass = 24)

1s² 2s² 2p⁶ 3s²

gulchehra teacher

100

What is the most active nonmetal?

Fluorine

200

What element is used while combustion process?

O₂

300

What are the products of the reaction between water and metal?

Metal hydroxide and hydrogen gas

400

Name the noble gases

He , Ne , Ar , Cr , Xe , Rn

500

The formula of atomic mass number(A)

A = p+n

assel teacher

100

Firework is example of .......... reaction.

exothermic

200

Definition of corrosion.

Interaction of metals with water,oxygen, etc.

300

The first element of the periodic table

H

400

Oxygen is best described as a?

Nonmetal

500

How is ozone written as?

O₃

dana teacher

100

Smallest unit of chemistry.....

atom

200

For what stands (p)?

proton

300

Name the group of the most active metals in periodic table

Alkali metals

400

Calculate the molar mass of water(H₂O).

H = 1, O = 16

18 amu

500

What are the colors of metals,nonmetals and metalloids?

Metals:metallic shiny(grey)

Nonmetals:dull

Metalloids:metallic shiny

zhannur teacher

100

Avogadro's number = ....

6.02 * 10²³

200

How many chemistry teachers do we have?

4

300

What is the mass of 1,5 moles of potassium hydroxide(KOH)?

K = 39, O = 16, H = 1

39+16+1  = 56

56 * 1,5  = 84g

400

Selena Gomez and Justin Bieber have been in relationship for many years. But one day Justin fell in love with Hailey and broke up with Selena.

What kind of chemical reaction is this?

single displacement

500

How many periods and groups in the periodic table?

18 groups, 7 periods