Flashcards

Question 1

What is the atomic number of an element?

Answer 1

The number of protons in the nucleus of an atom.

Question 2

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

Answer 2

False

Question 3

Fill in the blank: The formula for calculating the number of neutrons is _____.

Answer 3

Mass number - Atomic number

Question 4

What is the chemical symbol for sodium?

Answer 4

Na

Question 5

What is the pH of a neutral solution?

Answer 5

7

Question 6

Which of the following is a noble gas? (a) Oxygen (b) Helium (c) Nitrogen

Answer 6

b) Helium

Question 7

What is the name given to the vertical columns in the periodic table?

Answer 7

Groups

Question 8

True or False: Metals tend to gain electrons during chemical reactions.

Answer 8

False

Question 9

What is the main component of air?

Answer 9

Nitrogen

Question 10

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

Answer 10

Evaporation

Question 11

What is the formula for calculating the number of moles?

Answer 11

Number of moles = Mass (g) / Molar mass (g/mol)

Question 12

Which type of bond involves the sharing of electron pairs?

Answer 12

Covalent bond

Question 13

What is the relative atomic mass of carbon?

Answer 13

12

Question 14

True or False: Ionic compounds conduct electricity when solid.

Answer 14

False

Question 15

What is the definition of an isotope?

Answer 15

Atoms of the same element with different numbers of neutrons.

Question 16

Which of the following is an alkali metal? (a) Magnesium (b) Potassium (c) Calcium

Answer 16

b) Potassium

Question 17

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

Answer 17

Condensation

Question 18

What do you call a substance that speeds up a chemical reaction?

Answer 18

Catalyst

Question 19

What is the chemical formula for water?

Answer 19

H2O

Question 20

True or False: Acids have a pH less than 7.

Answer 20

True

Question 21

What is the term for a solution that contains the maximum amount of solute that can be dissolved?

Answer 21

Saturated solution

Question 22

What is the process called when a solid changes directly to a gas?

Answer 22

Sublimation

Question 23

Fill in the blank: The periodic table is arranged by increasing _____.

Answer 23

Atomic number

Question 24

Which type of reaction involves the breaking down of a compound into simpler substances?

Answer 24

Decomposition reaction

Question 25

What is the formula for calculating concentration?

Answer 25

Concentration (g/dm³) = Mass of solute (g) / Volume of solution (dm³)

Question 26

True or False: The law of conservation of mass states that mass is created in a chemical reaction.

Answer 26

False

Question 27

What is an example of a physical change?

Answer 27

Melting ice

Question 28

What is the chemical symbol for chlorine?

Answer 28

Cl

Question 29

Fill in the blank: An endothermic reaction absorbs _____.

Answer 29

Energy

Question 30

What is the main gas produced during respiration?

Answer 30

Carbon dioxide

Question 31

What is the name of the process by which plants make their own food?

Answer 31

Photosynthesis

Question 32

True or False: Bases react with acids to form salts and water.

Answer 32

True

Question 33

What is the term for the measure of how much solute is dissolved in a solvent?

Answer 33

Concentration

Question 34

What type of chemical reaction is represented by the equation: A + B → AB?

Answer 34

Synthesis reaction

Question 35

What is the principle behind the conservation of mass?

Answer 35

Mass cannot be created or destroyed in a chemical reaction.

Question 36

Fill in the blank: The main gas responsible for global warming is _____.

Answer 36

Carbon dioxide

Question 37

What does the term 'exothermic' refer to?

Answer 37

A reaction that releases heat.

Question 38

What is the formula for calculating energy change?

Answer 38

Energy change = Energy of products - Energy of reactants

Question 39

True or False: All chemical reactions require energy to start.

Answer 39

True

Question 40

What is the process of separating a mixture by heating and cooling called?

Answer 40

Distillation

Question 41

What is the chemical formula for table salt?

Answer 41

NaCl

Question 42

Which of the following is a characteristic of metals? (a) Brittle (b) Good conductors of heat (c) Low density

Answer 42

b) Good conductors of heat

Question 43

Fill in the blank: The smallest particle of an element is called an _____.

Answer 43

Atom

Question 44

What is the term for a mixture that has uniform composition throughout?

Answer 44

Homogeneous mixture