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Class 7 > Random > Flashcards

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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
Q

What is the term for the energy required to change a substance from a solid to a liquid?

A

Heat of fusion

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26
Q

Which gas is produced when vinegar reacts with baking soda?

A

Carbon dioxide (CO2)

27
Q

Fill in the blank: The law of conservation of mass states that mass cannot be _____.

A

Created or destroyed

28
Q

What is an alloy?

A

A mixture of two or more metals.

29
Q

True or False: The atomic mass of an element is the weighted average mass of all its isotopes.

A

True

30
Q

What is the term for a reaction that absorbs heat?

A

Endothermic reaction

31
Q

What is the chemical formula for table salt?

A

NaCl

32
Q

Fill in the blank: The study of matter and its changes is called _____.

A

Chemistry

33
Q

What is the basic unit of matter?

A

Atom

34
Q

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

A

True

35
Q

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

A

H2O

36
Q

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

A

Element

37
Q

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

A

B) Helium

38
Q

What is the pH scale used for?

A

To measure the acidity or alkalinity of a solution.

39
Q

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

A

True

40
Q

What is the chemical symbol for sodium?

A

Na

41
Q

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

A

Sublimation

42
Q

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

A

Nitrogen

43
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

44
Q

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

A

Atomic number

45
Q

True or False: Acids turn blue litmus paper red.

A

True

46
Q

What is the chemical formula for carbon dioxide?

A

CO2

47
Q

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

A

Homogeneous mixture

48
Q

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

A

Periods

49
Q

Which element is represented by the symbol ‘Fe’?

A

Iron

50
Q

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

A

True

51
Q

What is a covalent bond?

A

A chemical bond formed when two atoms share electrons.

52
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

53
Q

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

A

Filtration

54
Q

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

A

Molecule

55
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.

56
Q

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

A

False

57
Q

What is the term for the energy required to change a substance from a solid to a liquid?

A

Heat of fusion

58
Q

Which gas is produced when vinegar reacts with baking soda?

A

Carbon dioxide (CO2)

59
Q

Fill in the blank: The law of conservation of mass states that mass cannot be _____.

A

Created or destroyed

60
Q

What is an alloy?

A

A mixture of two or more metals.

61
Q

True or False: The atomic mass of an element is the weighted average mass of all its isotopes.

A

True

62
Q

What is the term for a reaction that absorbs heat?

A

Endothermic reaction

63
Q

What is the chemical formula for table salt?

A

NaCl

64
Q

Fill in the blank: The study of matter and its changes is called _____.

A

Chemistry

Class 7 (3 decks)

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