Khối 8
Science 8
Chemistry
Unit 7. Elements and compounds
Atoms
Choose the correct answer.
Carbon dioxide is a(n)
.
Atom
State
Element
Molecule
Giải thích
The correct answer
Molecule
Atom
Element
State
1/1
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There are
kinds of atoms that have been made in the laboratories
26
24
25
Giải thích
The correct answer
24
25
26
1/1
Complete the sentence.
Oxygen gas is made up of
atoms.
Đáp án
Oxygen gas is made up of
oxygen
atoms.
Giải thích
The correct answer
oxygen
1/1
Write the correct answer:
Different elements have
properties
Đáp án
Different elements have
different
properties
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The correct answer
different
1/1
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A group of joined atoms is called
.
Liquid
Elements
Plasma
Molecules
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The correct answer
Molecules
Elements
Liquid
Plasma
1/1
Complete the sentence.
force joins the atoms together to make up molecules
Đáp án
Intermolecular
force joins the atoms together to make up molecules
Giải thích
The correct answer
Intermolecular
1/1
Choose the correct answer.
Gold is made of millions of gold
.
Coin
Atom
Piece
Plate
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The correct answer
Atom
Coin
Plate
Piece
1/1
Choose the correct answer.
Atoms can be visualized via the scanning tunneling
.
Microscope
Electrophoresis
Telescope
Chromatography
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The correct answer
Microscope
Telescope
Chromatography
Electrophoresis
1/1
Fill in the blank.
Atoms of
type can join together
Đáp án
Atoms of
different
type can join together
Giải thích
The correct answer
different
1/1
Choose the correct answer.
Atoms are very tiny particles that cannot be
.
Altered
Divides
Reacted
Used
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The correct answer
Divides
Altered
Reacted
Used
1/1
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There are
Naturally occurring atoms
80
94
86
90
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94
86
80
90
1/1
Choose the correct answer.
Atoms of different molecules can be joined in a
way
Similar
Different
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The correct answer
Different
Similar
1/1
Complete the sentence.
Oxygen gas is made up of
. The oxygen gas can become liquid then solid
Đáp án
Oxygen gas is made up of
slowly
. The oxygen gas can become liquid then solid
Giải thích
The correct answer
slowly
1/1
Choose the correct answer.
Nitrogen dioxide is made up of
atoms
2
4
1
Giải thích
The correct answer
2
1
4
1/1
Complete the sentence.
Carbon, gold and silver are examples of
.
Đáp án
Carbon, gold and silver are examples of
elements
.
Giải thích
The correct answer
elements
1/1
Write the correct answer:
If there are 94 naturally occurring atoms, there are
elements
Đáp án
If there are 94 naturally occurring atoms, there are
94
elements
Giải thích
The correct answer
94
1/1