ai chem

Question 1

What is the atomic number of Carbon?

Answer 1

6

Question 2

True or False: An element’s atomic mass is the average mass of all its isotopes.

Answer 2

True

Question 3

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

Answer 3

H2O

Question 4

What is the pH of a neutral solution at 25°C?

Answer 4

7

Question 5

What is the name of the process in which a solid changes directly to a gas?

Answer 5

Sublimation

Question 6

Which gas is produced when an acid reacts with a metal?

Answer 6

Hydrogen

Question 7

What type of bond involves the sharing of electron pairs between atoms?

Answer 7

Covalent bond

Question 8

True or False: Ionic compounds conduct electricity in solid form.

Answer 8

False

Question 9

What is the molar mass of NaCl?

Answer 9

58.44 g/mol

Question 10

Which element has the highest electronegativity?

Answer 10

Fluorine

Question 11

What is the main product of the complete combustion of hydrocarbons?

Answer 11

Carbon dioxide and water

Question 12

Fill in the blank: The law of conservation of mass states that mass is ____ in a chemical reaction.

Answer 12

neither created nor destroyed

Question 13

What is the term for the amount of substance in moles present in a given volume of solution?

Answer 13

Concentration

Question 14

Which type of reaction involves the exchange of ions between two compounds?

Answer 14

Double displacement reaction

Question 15

True or False: An endothermic reaction absorbs heat from the surroundings.

Answer 15

True

Question 16

What is the term for the energy required to break a bond in a molecule?

Answer 16

Bond energy

Question 17

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

Answer 17

Au

Question 18

What is the main difference between physical and chemical changes?

Answer 18

Physical changes do not alter the substance’s chemical structure.

Question 19

What is the process by which plants convert carbon dioxide and water into glucose using sunlight?

Answer 19

Photosynthesis

Question 20

What is the formula for calculating the number of moles?

Answer 20

Moles = mass (g) / molar mass (g/mol)

Question 21

Which law states that the volume of a gas is directly proportional to its temperature at constant pressure?

Answer 21

Charles’s Law

Question 22

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

Answer 22

Hydrogen

Question 23

What is the name of the negatively charged ion?

Answer 23

Anion

Question 24

True or False: Metals are generally good conductors of electricity.

Answer 24

True

Question 25

What type of reaction occurs when an acid and a base react to form water and a salt?

Answer 25

Neutralization reaction

Question 26

What is the term for a substance that speeds up a chemical reaction without being consumed?

Answer 26

Catalyst

Question 27

What is Avogadro's number?

Answer 27

6.022 x 10^23

Question 28

Fill in the blank: The chemical formula for table salt is ____.

Answer 28

NaCl

Question 29

What does the term 'oxidation' refer to in a chemical reaction?

Answer 29

Loss of electrons

Question 30

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

Answer 30

Nitrogen

Question 31

True or False: A catalyst is consumed in a chemical reaction.

Answer 31

False

Question 32

What is the term for the amount of energy needed to raise the temperature of 1 gram of a substance by 1 degree Celsius?

Answer 32

Specific heat capacity

Question 33

What is the main function of a buffer solution?

Answer 33

To maintain a stable pH

Question 34

Fill in the blank: The chemical formula for ammonia is ____.

Answer 34

NH3

Question 35

What is the term for the process of a liquid turning into a gas?

Answer 35

Vaporization

Question 36

What is the primary component of natural gas?

Answer 36

Methane

Question 37

True or False: All alkali metals react vigorously with water.

Answer 37

True

Question 38

What is the name of the group of elements that are characterized by their lack of reactivity?

Answer 38

Noble gases

Question 39

What is the name of the bond formed when electrons are transferred from one atom to another?

Answer 39

Ionic bond

Question 40

Fill in the blank: The formula for calculating density is ____.

Answer 40

Density = mass/volume

Question 41

What is the term for the energy change that occurs when a chemical bond is formed or broken?

Answer 41

Enthalpy change

Question 42

Which type of radiation has the highest energy?

Answer 42

Gamma radiation

Question 43

True or False: Isotopes of an element have the same number of protons but different numbers of neutrons.

Answer 43

True

Question 44

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

Answer 44

Homogeneous mixture

Question 45

What is the primary product of the reaction between an acid and a carbonate?

Answer 45

Carbon dioxide

Question 46

Fill in the blank: The formula for calculating pressure is ____.

Answer 46

Pressure = force/area

Question 47

What is the term for the temperature at which a solid becomes a liquid?

Answer 47

Melting point

Question 48

What is the main purpose of titration in chemistry?

Answer 48

To determine the concentration of a solution

Question 49

True or False: The atomic mass unit (amu) is used to express atomic and molecular weights.

Answer 49

True

Question 50

What is the name of the process by which a liquid turns into a solid?

Answer 50

Freezing

Question 51

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

Answer 51

Atomic number

Question 52

Fill in the blank: The chemical formula for sulfuric acid is ____.

Answer 52

H2SO4

Question 53

Which type of reaction involves the breakdown of a compound into simpler products?

Answer 53

Decomposition reaction

Question 54

True or False: A saturated solution contains the maximum amount of solute that can dissolve at a given temperature.

Answer 54

True

Question 55

What is the primary factor that affects the rate of a chemical reaction?

Answer 55

Concentration of reactants

Question 56

What is the term for the process of a gas turning into a liquid?

Answer 56

Condensation

Question 57

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

Answer 57

K

Question 58

What is the name of the phenomenon where molecules of a substance move from an area of higher concentration to an area of lower concentration?

Answer 58

Diffusion

Question 59

True or False: All chemical reactions are reversible.

Answer 59

False

Question 60

What is the term for the energy stored in chemical bonds?

Answer 60

Chemical potential energy

Question 61

What is the primary purpose of a chromatography technique?

Answer 61

To separate mixtures

Question 62

Fill in the blank: The chemical formula for ethanol is ____.

Answer 62

C2H5OH

Question 63

What is the term for a solution that has a pH less than 7?

Answer 63

Acidic solution

Question 64

True or False: All metals are malleable.

Answer 64

False

Question 65

What is the term for the temperature at which a gas becomes a liquid?

Answer 65

Condensation point

Question 66

What is the name of the process used to produce hydrogen gas from water?

Answer 66

Electrolysis

Question 67

Fill in the blank: The chemical formula for calcium carbonate is ____.

Answer 67

CaCO3

Question 68

What is the term for the process of adding electrons to an atom or molecule?

Answer 68

Reduction

Question 69

True or False: The nucleus of an atom contains protons and electrons.

Answer 69

False

Question 70

What is the term for a substance that increases the rate of a reaction without being consumed?

Answer 70

Catalyst

Question 71

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

Answer 71

Fe

Question 72

What is the term for the measure of the ability of an atom to attract electrons?

Answer 72

Electronegativity