Chemistry

Question 1

What is the main focus of Chapter 1?

Answer 1

The main focus of Chapter 1 is the introduction to chemical reactions and their types.

Question 2

True or False: A chemical reaction involves the rearrangement of atoms.

Answer 2

True

Question 3

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

Answer 3

neither created nor destroyed

Question 4

What are the two main types of chemical reactions discussed in Chapter 1?

Answer 4

Synthesis and decomposition reactions.

Question 5

Multiple choice: Which of the following is an example of a decomposition reaction? A) A + B → AB B) AB → A + B C) A + B → C

Answer 5

B) AB → A + B

Question 6

What is a reactant?

Answer 6

A reactant is a substance that undergoes a chemical change in a reaction.

Question 7

Name one factor that can affect the rate of a chemical reaction.

Answer 7

Temperature, concentration, surface area, or catalysts.

Question 8

True or False: Exothermic reactions absorb heat from their surroundings.

Answer 8

False

Question 9

What is the definition of an endothermic reaction?

Answer 9

An endothermic reaction is a reaction that absorbs heat from the surroundings.

Question 10

What is Chapter 2 primarily about?

Answer 10

Chapter 2 is primarily about the different types of reactions and their characteristics.

Question 11

Multiple choice: Which type of reaction is characterized by the exchange of ions between two compounds? A) Synthesis B) Decomposition C) Double displacement

Answer 11

C) Double displacement

Question 12

Fill in the blank: In a __________ reaction, two or more substances combine to form a single product.

Answer 12

synthesis

Question 13

What is the general form of a combustion reaction?

Answer 13

Hydrocarbon + O2 → CO2 + H2O

Question 14

True or False: Catalysts are substances that speed up a chemical reaction without being consumed.

Answer 14

True

Question 15

What does Chapter 3 cover regarding chemical equations?

Answer 15

Chapter 3 covers how to write and balance chemical equations.

Question 16

What is a balanced chemical equation?

Answer 16

A balanced chemical equation has the same number of each type of atom on both sides of the equation.

Question 17

Multiple choice: What is the purpose of balancing a chemical equation? A) To increase the speed of reaction B) To ensure mass conservation C) To change the reactants

Answer 17

B) To ensure mass conservation

Question 18

Fill in the blank: In a balanced equation, the coefficients represent the __________ of the reactants and products.

Answer 18

moles

Question 19

How do you start balancing a chemical equation?

Answer 19

Start by counting the number of atoms of each element on both sides.

Question 20

True or False: It is acceptable to change the subscripts in a chemical formula to balance an equation.

Answer 20

False

Question 21

What is the first step in balancing the equation C3H8 + O2 → CO2 + H2O?

Answer 21

Balance the carbon atoms first.

Question 22

What does the symbol ‘→’ represent in a chemical equation?

Answer 22

The symbol ‘→’ represents the direction of the reaction, indicating the products formed from the reactants.

Question 23

What is meant by the term ‘stoichiometry’?

Answer 23

Stoichiometry refers to the calculation of reactants and products in chemical reactions.

Question 24

Fill in the blank: The __________ of a reaction is the maximum amount of product that can be formed.

Answer 24

theoretical yield

Question 25

True or False: The actual yield is always equal to the theoretical yield.

Answer 25

False