Chemical Reactions Ai

Question 1

What is a chemical reaction?

Answer 1

A process where substances (reactants) are transformed into different substances (products).

Question 2

True or False: In a chemical reaction, atoms are created or destroyed.

Answer 2

False

Question 3

What are the reactants in a chemical equation?

Answer 3

The starting substances that undergo a chemical change.

Question 4

What is the law of conservation of mass?

Answer 4

Mass is neither created nor destroyed in a chemical reaction.

Question 5

Fill in the blank: A chemical equation must be ______ to obey the law of conservation of mass.

Answer 5

balanced

Question 6

What does a catalyst do in a chemical reaction?

Answer 6

It speeds up the reaction without being consumed.

Question 7

What is an endothermic reaction?

Answer 7

A reaction that absorbs heat from its surroundings.

Question 8

What is an exothermic reaction?

Answer 8

A reaction that releases heat to its surroundings.

Question 9

Which of the following is a sign of a chemical reaction? A) Color change B) Temperature change C) Formation of a gas D) All of the above

Answer 9

D) All of the above

Question 10

What is a synthesis reaction?

Answer 10

A reaction where two or more substances combine to form a single product.

Question 11

What is a decomposition reaction?

Answer 11

A reaction where a single compound breaks down into two or more simpler products.

Question 12

What is a single displacement reaction?

Answer 12

A reaction where one element replaces another in a compound.

Question 13

What is a double displacement reaction?

Answer 13

A reaction where parts of two compounds switch places to form two new compounds.

Question 14

True or False: Energy is often released in the form of heat or light during a chemical reaction.

Answer 14

True

Question 15

What is the role of coefficients in a balanced chemical equation?

Answer 15

They indicate the number of moles of each substance involved in the reaction.

Question 16

Fill in the blank: A ________ is a substance formed as a result of a chemical reaction.

Answer 16

product

Question 17

What is an oxidation-reduction (redox) reaction?

Answer 17

A reaction involving the transfer of electrons between two species.

Question 18

What is an acid-base reaction?

Answer 18

A reaction that involves the transfer of protons (H+) between acids and bases.

Question 19

What is the pH scale used for?

Answer 19

To measure the acidity or basicity of a solution.

Question 20

True or False: A neutral solution has a pH of 7.

Answer 20

True

Question 21

What is a concentration in terms of solutions?

Answer 21

The amount of solute present in a given volume of solvent.

Question 22

What is a solute?

Answer 22

The substance that is dissolved in a solution.

Question 23

What is a solvent?

Answer 23

The substance that dissolves the solute in a solution.

Question 24

What is the difference between a saturated and an unsaturated solution?

Answer 24

A saturated solution contains the maximum amount of solute at a given temperature, while an unsaturated solution has less.

Question 25

What is an equilibrium in a chemical reaction?

Answer 25

A state where the forward and reverse reactions occur at the same rate.

Question 26

What does Le Chatelier's principle state?

Answer 26

If a system at equilibrium is disturbed, it will shift to counteract the disturbance.

Question 27

What is a limiting reactant?

Answer 27

The reactant that is completely consumed first, limiting the amount of product formed.

Question 28

What is the difference between a homogeneous and heterogeneous mixture?

Answer 28

A homogeneous mixture has a uniform composition, while a heterogeneous mixture has a non-uniform composition.

Question 29

What does the term 'stoichiometry' refer to?

Answer 29

The calculation of reactants and products in chemical reactions.

Question 30

What is a combustion reaction?

Answer 30

A reaction that occurs when a substance reacts with oxygen, producing energy, carbon dioxide, and water.

Question 31

True or False: All combustion reactions are exothermic.

Answer 31

True

Question 32

What is a precipitation reaction?

Answer 32

A reaction that occurs when two solutions combine to form an insoluble solid.

Question 33

What is the purpose of a titration?

Answer 33

To determine the concentration of a solution by reacting it with a solution of known concentration.

Question 34

What does the term 'activation energy' refer to?

Answer 34

The minimum energy required for a reaction to occur.

Question 35

What is the difference between an ionic bond and a covalent bond?

Answer 35

An ionic bond involves the transfer of electrons, while a covalent bond involves the sharing of electrons.

Question 36

What is a molecular formula?

Answer 36

A formula that shows the number and type of atoms in a molecule.

Question 37

What is a structural formula?

Answer 37

A formula that shows the arrangement of atoms in a molecule.

Question 38

What is an isomer?

Answer 38

Compounds with the same molecular formula but different structural formulas.

Question 39

What is a functional group in organic chemistry?

Answer 39

A specific group of atoms within a molecule that is responsible for its characteristic reactions.

Question 40

What is the significance of the octet rule?

Answer 40

Atoms tend to bond in such a way that they have eight electrons in their valence shell.