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Chemistry N5 > Deck 1 > Flashcards

Deck 1 Flashcards

1
Q

What is the atomic number of an element?

A

The number of protons in the nucleus of an atom.

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2
Q

True or False: The mass number is the sum of protons and neutrons in an atom.

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 an ion?

A

An atom or molecule that has a net electric charge due to the loss or gain of one or more electrons.

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5
Q

What is the pH scale used for?

A

To measure the acidity or alkalinity of a solution.

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6
Q

What is a catalyst?

A

A substance that increases the rate of a chemical reaction without being consumed.

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7
Q

What is the formula for calculating density?

A

Density = Mass / Volume

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8
Q

True or False: All alkali metals are found in Group 1 of the periodic table.

A

True

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9
Q

What is the process of a solid turning directly into a gas called?

A

Sublimation

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10
Q

What is the principle behind the law of conservation of mass?

A

Mass is neither created nor destroyed in a chemical reaction.

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11
Q

What do we call a solution that has a pH of 7?

A

Neutral solution

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12
Q

Fill in the blank: The chemical symbol for sodium is ____.

A

Na

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13
Q

What is an exothermic reaction?

A

A reaction that releases energy in the form of heat.

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14
Q

What is the main component of natural gas?

A

Methane (CH4)

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15
Q

True or False: Acids taste bitter.

A

False

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16
Q

What is the term for a substance that increases the concentration of hydrogen ions in a solution?

A

Acid

17
Q

What is the formula to calculate the number of moles?

A

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

18
Q

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

A

Periods

19
Q

What is the difference between an element and a compound?

A

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

20
Q

What is the name of the gas released during photosynthesis?

A

Oxygen (O2)

21
Q

Fill in the blank: The process of breaking down glucose to release energy is called ____.

A

Cellular respiration

22
Q

What is the term for the amount of energy required to raise the temperature of 1 gram of water by 1 degree Celsius?

A

Calorie

23
Q

True or False: Noble gases are highly reactive.

A

False

24
Q

What is a combustion reaction?

A

A chemical reaction that occurs when a substance combines with oxygen, releasing energy in the form of light or heat.

25
Q

What is the law of definite proportions?

A

A chemical compound always contains its component elements in fixed ratio by mass.

26
Q

What is the main characteristic of metals?

A

They are good conductors of heat and electricity.

27
Q

What is the term for the energy required to break the bonds in a chemical reaction?

A

Activation energy

Chemistry N5 (1 decks)

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