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CHEMISTRY 2 Flashcards

1
Q

What is the atomic number of carbon?

A

6

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2
Q

True or False: The pH scale measures acidity and basicity.

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 primary gas produced during photosynthesis?

A

Oxygen

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5
Q

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

A

B) Argon

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6
Q

What is the 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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7
Q

What is the law of conservation of mass?

A

Mass is neither created nor destroyed in a chemical reaction.

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8
Q

True or False: Acids turn blue litmus paper red.

A

True

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9
Q

What is the chemical symbol for sodium?

A

Na

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10
Q

Atomic number for Neon?

A

10

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11
Q

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

A

sublimation

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12
Q

Which part of the atom has a positive charge?

A

Proton

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13
Q

What is the main difference between ionic and covalent bonds?

A

Ionic bonds involve the transfer of electrons, while covalent bonds involve the sharing of electrons.

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14
Q

Which of the following is an example of a physical change? A) Burning wood B) Melting ice C) Rusting iron

A

B) Melting ice

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15
Q

What is the formula for calculating the number of moles?

A

Moles = Mass (g) / Molar Mass (g/mol)

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16
Q

True or False: All substances are made of matter.

A

True

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17
Q

What is the periodic table used for?

A

To organize elements based on their atomic number, electron configuration, and recurring chemical properties.

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18
Q

What is an isotope?

A

Atoms of the same element with different numbers of neutrons.

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19
Q

Fill in the blank: The pH of pure water is ___.

A

7

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20
Q

True or False: A physical change can be reversed.

A

True

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21
Q

Which gas is commonly associated with respiration?

A

Carbon dioxide

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22
Q

What is the main purpose of a chemical equation?

A

To represent a chemical reaction in terms of reactants and products.

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23
Q

True or False: Electrons have a negative charge.

24
Q

What is a solution?

A

A homogeneous mixture of two or more substances.

25
Q

What does ‘solubility’ refer to?

A

The ability of a substance to dissolve in a solvent.

26
Q

What is the molar mass of water (H2O)?

27
Q

Fill in the blank: The smallest unit of an element is called an ___.

28
Q

What is an acid-base reaction?

A

A chemical reaction where an acid reacts with a base to produce water and a salt.

29
Q

What is the primary component of air?

30
Q

Which of the following has the highest electronegativity? A) Fluorine B) Oxygen C) Nitrogen

A

A) Fluorine

31
Q

True or False: Chemical changes can be reversed easily.

32
Q

What is the definition of ‘reactants’?

A

Substances that undergo a chemical change in a reaction.

33
Q

What is a polymer?

A

A large molecule made up of repeating structural units called monomers.

34
Q

Fill in the blank: The process of a gas turning into a liquid is called ___.

A

condensation

35
Q

Which element is essential for the formation of DNA?

A

Phosphorus

36
Q

What is the atomic number of Silicon?

37
Q

What is the atomic number of Carbon?

38
Q

Which element has the chemical symbol ‘Na’?

39
Q

True or False: Helium is a metal.

40
Q

Fill in the blank: The element with atomic number 1 is __________.

41
Q

What group in the periodic table contains the Noble gases?

42
Q

Which element is represented by the symbol ‘Fe’?

43
Q

What is the most abundant element in the universe?

44
Q

Identify the element: Atomic number 26.

45
Q

True or False: Oxygen is a diatomic molecule under standard conditions.

46
Q

What is the chemical symbol for Gold?

47
Q

Which element has the highest atomic number that occurs naturally?

A

Uranium (92)

48
Q

Fill in the blank: The element with the symbol ‘Cl’ is __________.

49
Q

What is the characteristic of Alkali metals?

A

They are highly reactive and have one electron in their outer shell.

50
Q

Which element is a liquid at room temperature?

51
Q

What is the atomic number of Silicon?

52
Q

True or False: All elements in Group 1 are nonmetals.

53
Q

What element is known for its use in batteries and has the symbol ‘Li’?

54
Q

Which element is the lightest noble gas?

55
Q

What is the chemical symbol for Boron?

56
Q

Identify the element: It is a metalloid with the atomic number 14.

SCIENCE (4 decks)

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