WorksheetsThe atom and chemical substances 7th grade
Total questions: 20
Worksheet time: 47mins
Based on Dalton’s atomic theory, indicate if the sentences are true (T) or false (F): A compound is a composition of various simple substances.
True
False
Based on Dalton’s atomic theory, indicate if the sentences are true (T) or false (F): Matter is discreet.
True
False
Indicate whether the following representation correspond to simple substances, compounds or mixtures:
Simple substances
Compounds
Mixture
Indicate whether the following representation correspond to simple substances, compounds or mixtures:
Simple substances
Compounds
Mixture
Based on Dalton’s atomic theory, indicate if the sentences are true (T) or false (F): Electrons are massless particles.
True
False
Based on Dalton’s atomic theory, indicate if the sentences are true (T) or false (F): The mass of an electron is very small compared to that of a proton.
True
False
Based on Dalton’s atomic theory, indicate if the sentences are true (T) or false (F): Atoms are electrically neutral, as they have got twice the amount of electrons than protons.
True
False
Label the blank spaces using the following terms: nucleus, electron, proton, neutron:
a) Nucleus; b) Electrón; c) Proton; d) Neutron
a) Nucleus; b) Proton; c) Electron; d) Neutron
a) Electron; b) Proton; c) Nucleus; d) Neutron
Indicate which atom consists of seven protons, seven electrons and nine neutrons:
Atomic number, A = 7; mass number, Z = 9.
Atomic number, Z = 7; mass number, A = 9.
Atomic number, Z = 7; mass number, A = 16.
Atomic number, A = 7; mass number, Z = 16.
Indicate which of the following descriptions corresponds to a cation Ca2+ (Z = 20):
It is a calcium atom and has got 22 electrons.
It is a calcium atom that has gained two electrons.
It is a calcium atom with 18 electrons.
It is a calcium atom with 22 protons.
Indicate which of these descriptions correspond to benzene, whose formula is C6H6:
A substance that consists of six carbon molecules and six hydrogen
molecules.
Each benzene molecule is formed of twelve atoms.
There are the same number of carbon molecules as hydrogen molecules in a benzene crystal.
A benzene molecule consists of six carbon atoms and six hydrogen atoms.
With reference to the periodic table, tick the option that is correct:
It is the classification of all chemical elements present in the natural world, ordered by their mass number, which are grouped into seven groups or columns and into eighteen rows or periods.
It is the classification of all possible chemical elements, ordered by their mass number, which are grouped into seven groups or columns and eighteen rows or periods.
It is the classification of all of the chemical elements that exist, ordered by their atomic number, which are grouped in eighteen groups or columns and seven rows or periods.
It is the classification of all possible chemical elements, sorted by atomic number, which are grouped into seven groups or columns and eighteen rows or periods.
Choose the correct to each element: Sodium
Na
Li
S
So
Choose the correct to each element: Phosphorus
Na
P
S
F
Choose the correct to each element: Fluorine
Na
P
S
F
Choose the correct to each element: Gold
Na
Au
Gl
O
Choose the correct to each element: Mercury
Me
Hg
My
O
Choose the correct to each element: Calcium
Ca
C
Cl
O
Choose the correct to each element: Tungsten
W
tG
Tg
Tn
Choose the correct to each element: Oxygen
W
O
Tg
Tn
