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WorksheetsUnit 5: MOLECULE – ELEMENT – COMPOUND Lesson 3
Total questions: 10
Worksheet time: 5mins
A jar for oxygen gas contains
O2 molecules
Individual oxygen atoms are not united with each other.
A giant macromolecule contains many oxygen atoms.
An O2 molecule
The copper electric wire core contains
Cu2 molecules
Individual Cu atoms are not united with each other
Lots of Cu atoms are united together
a Cu molecule
Molecules of a single substance?
Copper, Oxygen , Salt
Copper, Oxygen ,Helium
Copper, Carbon dioxide , Salt
Copper, Helium, Carbon dioxide
Molecules of a compound?
Copper, Oxygen
Carbon dioxide, Helium
Copper, Salt
Carbon dioxide , Salt
In the following chemicals: Li, N2, CO, Cl2, S8, NaCl. Which substances are single substances?
Li, N2, Cl2, S8.
Li, N2, CO, Cl2.
Li, N2, CO, S8, NaCl
Li, N2, CO, S8, NaCl.
In the following chemicals: Li, N2, CO, Cl2, S8, NaCl. Which substances are compounds?
CO, Cl2
CO, NaCl.
Li, CO, Cl2
Cl2, S8, NaCl.
A water molecule contains two atoms of hydrogen and one of oxygen. Water is
compound
single substance
mixture
chemical element
Neon lamp contains
Neon gas molecules ( Ne2).
Individual neon ( Ne) atoms are not united with each other
giant macromolecule contains many neon atoms
a neon atom
Image 5.4. Describes a molecule containing carbon, hydrogen, and oxygen.The number of atoms of each element of carbon, hydrogen, and oxygen present in a molecule of this substance is respectively
1, 6, 2.
2, 5, 1.
2, 6, 1.
6, 2, 1.
Use the atomic mass values of some elements in the periodic table to calculate the molecular masses of the substances shown in the figure.
Nitrogen molecule:
2.14 = 28 (amu).
Methane molecule:
12 + 4.1 = 16 (amu)
Water molecule
1.2 + 16 = 18 (amu)
Nitrogen molecule:
2.16 = 32 (amu).
Methane molecule:
12 + 4.1 = 16 (amu)
Water molecule
1.2 + 16 = 18 (amu)
Nitrogen molecule:
2.14 = 28 (amu).
Methane molecule:
12 + 1 = 13 (amu)
Water molecule
1.2 + 16 = 18 (amu)
Nitrogen molecule:
2.12 = 24 (amu).
Methane molecule:
12 + 4.1 = 16 (amu)
Water molecule
1.2 + 16 = 18 (amu)
