Quiz about chemistry

Question 1

The molar mass of HCL is

Accepted Answer

36,5 g/mol

Answer

35,5 g/mol

Answer

35,6 g/mol

Answer

1 g/mol

Question 2

Nitric oxide (3)

Accepted Answer

N2O3

Answer

NO

Answer

N2O5

Answer

NO3

Question 3

Formula of hydrocyanic acid

Accepted Answer

HCN

Answer

HCOOH

Answer

CH3COOH

Answer

HCLO

Question 4

Formic acid is ...

Accepted Answer

weak

Answer

strong

Question 5

Which of these is an amphoteric oxide?

Accepted Answer

BeO

Answer

FeO

Answer

Ag2O

Answer

NO

Question 6

The element with atomic number 88 belongs to the family:

Accepted Answer

s

Answer

p

Answer

d

Answer

f

Question 7

Specify the name of the chemical substance

Accepted Answer

snowflake

Answer

snow

Answer

ice

Answer

water

Question 8

A pure substance, not a mixture, can be considered:

Accepted Answer

distilled water

Answer

cologne

Answer

hydrochloric acid

Answer

milk

Question 9

Indicate the fourth "extra" in the list:

Accepted Answer

smoke

Answer

ice

Answer

snowflake

Answer

iceberg

Question 10

Salt CANNOT be obtained by interaction:

Accepted Answer

oxides with water

Answer

metals and non - metals

Answer

acid oxides with alkalis

Answer

metals and salts

Question 11

Indicate the electronic configuration of the element atom, which in the simplest hydrogen compound has an oxidation state of -2:

Accepted Answer

1s²2s²2p⁶3s²3p⁴

Answer

1s22s1

Answer

1s²2s²2p³

Answer

1s²2s²2p²

Question 12

Avogadro's number is denoted by:

Accepted Answer

NA

Answer

N

Answer

n

Answer

A

Question 13

How many times is oxygen heavier or lighter than air?

Accepted Answer

1.103 times heavier

Answer

0.9 times lighter

Answer

0.55 times heavier

Answer

lighter 2 times

Question 14

Compounds made up of two elements, one of which is oxygen.

Accepted Answer

oxides

Answer

acids

Answer

salt

Answer

hydrides

Question 15

Reactions with the release of energy are called?

Accepted Answer

exothermic

Answer

catalytic

Answer

endothermic

Question 16

When hydrogen reacts with oxygen, it forms.

Accepted Answer

water

Answer

hydrogen peroxide

Answer

acid

Answer

salt

Question 17

Volume fraction of oxygen in air:

Accepted Answer

21%

Answer

0,9%

Answer

0,03%

Answer

78%

Question 18

The molar mass is?

Accepted Answer

The mass of one mole of a pure substance

Answer

A colorless, odorless, highly flammable gas, the chemical element of atomic number 1.

Answer

The volume occupied by 1 mole of a gas at standard temperature and pressure (STP); 22.4 L

Answer

lFoating or sinking when compared to water

Question 19

The molar volume is?

Accepted Answer

The volume occupied by 1 mole of a gas at standard temperature and pressure (STP); 22.4 L

Answer

Light blue coloured gas with sharp , pleasant odour

Answer

Floating or sinking when compared to water

Answer

A reaction that ABSORBS energy in the form of heat

Question 20

Endothermic reaction is?

Accepted Answer

A reaction that absorbs energy in the form of heat

Answer

Floating or sinking when compared to water

Answer

A reaction that releases energy in the form of heat

Answer

The SI base unit used to measure the amount of a substance

Question 21

Hydrogen

Accepted Answer

A colorless, odorless, highly flammable gas, the chemical element of atomic number 1.

Answer

A reaction that ABSORBS energy in the form of heat

Answer

Light blue coloured gas with sharp , pleasant odour

Question 22

Oxygen

Accepted Answer

A colorless, odorless reactive gas, the chemical element of atomic number 8 and the life-supporting component of the air.

Answer

A colorless, odorless, highly flammable gas, the chemical element of atomic number 1.

Answer

Light blue coloured gas with sharp , pleasant odour

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