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Worksheetschemistry
Total questions: 30
Worksheet time: 59mins
The molar mass of HCL is
36,5 g/mol
35,5 g/mol
35,6 g/mol
1 g/mol
Nitric oxide (3)
NO
N2O5
N2O3
NO3
Formula of hydrocyanic acid
HCOOH
HCN
CH3COOH
HCLO
Formic acid is ...
strong
weak
Which of the following reactions takes place?
ZnSO4 + Fe →
CaCO3+NH4OH →
Ca(NO3)2+Na2CO3 →
Na2CO3 →
Which of these is an amphoteric oxide?
BeO
FeO
Ag2O
NO
The element with atomic number 88 belongs to the family:
s
p
d
f
Specify the name of the chemical substance
snow
ice
water
snowflake
A pure substance, not a mixture, can be considered:
cologne
distilled water
hydrochloric acid
milk
Indicate the fourth "extra" in the list:
ice
snowflake
smoke
iceberg
Salt CANNOT be obtained by interaction:
metals and non - metals
acid oxides with alkalis
oxides with water
metals and salts
Indicate the electronic configuration of the element atom, which in the simplest hydrogen compound has an oxidation state of -2:
1s22s1
1s22s22p63s23p4
1s22s22p3
1s22s22p2
Avogadro's number is denoted by:
N
NA
n
A
Determine the elements whose atoms in the ground state have all valence electrons only at the s-sublevels. Write down the numbers of the selected elements.
1) S 2) V 3) Mg 4) Al 5) H
(a)
From the proposed list, select two substances, each of which interacts with graphite.
1) hydrochloric acid 2) sulfuric acid (conc.) 3) magnesium sulfate
4) hydrogen 5) potassium hydroxide (solution)
Write down the numbers of the selected answers.
(a)
How many times is oxygen heavier or lighter than air?
0.9 times lighter
0.55 times heavier
1.103 times heavier
lighter 2 times
Compounds made up of two elements, one of which is oxygen.
acids
salt
oxides
hydrides
Reactions with the release of energy are called?
catalytic
exothermic
endothermic
When hydrogen reacts with oxygen, it forms.
water
hydrogen peroxide
acid
salt
Volume fraction of oxygen in air:
0,9%
0,03%
21%
78%
Energy conservation law?
an equation that includes the quantity of energy released or absorbed as heat during the reaction as written
A reaction that releases energy in the form of heat
number of representative particles in a mole, 6.02 X 10^23
Energy cannot be created or destroyed
Avogadro's number?
6.02 X 10^23
6.20 X 10^23
6.002 X 10^23
6.02 X 10^22
Stoichimetry?
The process of burning something
A reaction that releases energy in the form of heat
Number of representative particles in a mole, 6.02 X 10^23
The calculation of quantities in chemical reactions
The Mole is?
The SI base unit used to measure the amount of a substance
A reaction that ABSORBS energy in the form of heat
Floating or sinking when compared to water
Conditions of 0.00°C and 1 atm pressure
The molar mass is?
A colorless, odorless, highly flammable gas, the chemical element of atomic number 1.
The mass of one mole of a pure substance
The volume occupied by 1 mole of a gas at standard temperature and pressure (STP); 22.4 L
lFoating or sinking when compared to water
The molar volume is?
The volume occupied by 1 mole of a gas at standard temperature and pressure (STP); 22.4 L
Light blue coloured gas with sharp , pleasant odour
Floating or sinking when compared to water
A reaction that ABSORBS energy in the form of heat
STP (standard temperature and pressure)?
A reaction that releases energy in the form of heat
The process of burning something
Conditions of 0.00°C and 1 atm pressure
The study of energy changes that occur during chemical reactions and changes in state
Endothermic reaction is?
Floating or sinking when compared to water
A reaction that absorbs energy in the form of heat
A reaction that releases energy in the form of heat
The SI base unit used to measure the amount of a substance
Hydrogen
A reaction that ABSORBS energy in the form of heat
A colorless, odorless, highly flammable gas, the chemical element of atomic number 1.
Light blue coloured gas with sharp , pleasant odour
Oxygen
A colorless, odorless reactive gas, the chemical element of atomic number 8 and the life-supporting component of the air.
A colorless, odorless, highly flammable gas, the chemical element of atomic number 1.
Light blue coloured gas with sharp , pleasant odour
