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1
Q

What is the basic unit of matter?

A

Atom

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2
Q

True or False: A molecule is made up of two or more atoms.

A

True

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3
Q

Fill in the blank: The chemical formula for water is _____.

A

H2O

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4
Q

What is the term for a substance that cannot be broken down into simpler substances?

A

Element

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5
Q

Which of the following is a noble gas? A) Oxygen B) Helium C) Nitrogen

A

B) Helium

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6
Q

What is the pH scale used for?

A

To measure the acidity or alkalinity of a solution.

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7
Q

True or False: An ion is an atom or molecule that has gained or lost one or more electrons.

A

True

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8
Q

What is the chemical symbol for sodium?

A

Na

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9
Q

Fill in the blank: The process of a solid turning directly into a gas is called _____.

A

Sublimation

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10
Q

What is the primary gas found in the Earth’s atmosphere?

A

Nitrogen

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11
Q

Which of the following is an example of a chemical change? A) Melting ice B) Burning wood C) Dissolving sugar

A

B) Burning wood

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12
Q

What is the term for the number of protons in the nucleus of an atom?

A

Atomic number

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13
Q

True or False: Acids turn blue litmus paper red.

A

True

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14
Q

What is the chemical formula for carbon dioxide?

A

CO2

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15
Q

Fill in the blank: A mixture that has a uniform composition is called a _____.

A

Homogeneous mixture

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16
Q

What do we call the horizontal rows in the periodic table?

A

Periods

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17
Q

Which element is represented by the symbol ‘Fe’?

A

Iron

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18
Q

True or False: The boiling point of water is 100 degrees Celsius at standard atmospheric pressure.

A

True

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19
Q

What is a covalent bond?

A

A chemical bond formed when two atoms share electrons.

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20
Q

Which of the following is a property of metals? A) Brittle B) Good conductors of heat C) Dull appearance

A

B) Good conductors of heat

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21
Q

What is the process of separating a solid from a liquid by filtration called?

A

Filtration

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22
Q

Fill in the blank: The smallest particle of a compound is called a _____.

A

Molecule

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23
Q

What is the main difference between an element and a compound?

A

An element is a pure substance made of one type of atom, while a compound is made of two or more different types of atoms chemically bonded together.

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24
Q

True or False: All metals are solid at room temperature.

A

False

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25
What is the term for the energy required to change a substance from a solid to a liquid?
Heat of fusion
26
Which gas is produced when vinegar reacts with baking soda?
Carbon dioxide (CO2)
27
Fill in the blank: The law of conservation of mass states that mass cannot be _____.
Created or destroyed
28
What is an alloy?
A mixture of two or more metals.
29
True or False: The atomic mass of an element is the weighted average mass of all its isotopes.
True
30
What is the term for a reaction that absorbs heat?
Endothermic reaction
31
What is the chemical formula for table salt?
NaCl
32
Fill in the blank: The study of matter and its changes is called _____.
Chemistry
33
What is the basic unit of matter?
Atom
34
True or False: A molecule is made up of two or more atoms.
True
35
Fill in the blank: The chemical formula for water is _____.
H2O
36
What is the term for a substance that cannot be broken down into simpler substances?
Element
37
Which of the following is a noble gas? A) Oxygen B) Helium C) Nitrogen
B) Helium
38
What is the pH scale used for?
To measure the acidity or alkalinity of a solution.
39
True or False: An ion is an atom or molecule that has gained or lost one or more electrons.
True
40
What is the chemical symbol for sodium?
Na
41
Fill in the blank: The process of a solid turning directly into a gas is called _____.
Sublimation
42
What is the primary gas found in the Earth's atmosphere?
Nitrogen
43
Which of the following is an example of a chemical change? A) Melting ice B) Burning wood C) Dissolving sugar
B) Burning wood
44
What is the term for the number of protons in the nucleus of an atom?
Atomic number
45
True or False: Acids turn blue litmus paper red.
True
46
What is the chemical formula for carbon dioxide?
CO2
47
Fill in the blank: A mixture that has a uniform composition is called a _____.
Homogeneous mixture
48
What do we call the horizontal rows in the periodic table?
Periods
49
Which element is represented by the symbol 'Fe'?
Iron
50
True or False: The boiling point of water is 100 degrees Celsius at standard atmospheric pressure.
True
51
What is a covalent bond?
A chemical bond formed when two atoms share electrons.
52
Which of the following is a property of metals? A) Brittle B) Good conductors of heat C) Dull appearance
B) Good conductors of heat
53
What is the process of separating a solid from a liquid by filtration called?
Filtration
54
Fill in the blank: The smallest particle of a compound is called a _____.
Molecule
55
What is the main difference between an element and a compound?
An element is a pure substance made of one type of atom, while a compound is made of two or more different types of atoms chemically bonded together.
56
True or False: All metals are solid at room temperature.
False
57
What is the term for the energy required to change a substance from a solid to a liquid?
Heat of fusion
58
Which gas is produced when vinegar reacts with baking soda?
Carbon dioxide (CO2)
59
Fill in the blank: The law of conservation of mass states that mass cannot be _____.
Created or destroyed
60
What is an alloy?
A mixture of two or more metals.
61
True or False: The atomic mass of an element is the weighted average mass of all its isotopes.
True
62
What is the term for a reaction that absorbs heat?
Endothermic reaction
63
What is the chemical formula for table salt?
NaCl
64
Fill in the blank: The study of matter and its changes is called _____.
Chemistry

Class 7 (3 decks)

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