CH3 PART 3

Question 2

What is an empirical formula?

Answer 2

An empirical formula represents the simplest whole-number ratio of the elements in a compound.

Question 3

True or False: The empirical formula can indicate the actual number of atoms in a molecule.

Answer 3

False

Question 4

What is the first step in determining an empirical formula?

Answer 4

Convert the mass of each element to moles.

Question 5

Fill in the blank: The empirical formula is derived from the ______ of each element present in a compound.

Answer 5

mole ratio

Question 6

How do you find the mole ratio in an empirical formula calculation?

Answer 6

Divide the number of moles of each element by the smallest number of moles calculated.

Question 7

What is the empirical formula for glucose (C6H12O6)?

Answer 7

CH2O

Question 8

True or False: Chemical reactions involve the rearrangement of atoms.

Answer 8

True

Question 9

What does a balanced chemical equation represent?

Answer 9

It represents the conservation of mass and the stoichiometry of the reaction.

Question 10

What are the two main types of chemical reactions?

Answer 10

Synthesis and decomposition reactions.

Question 11

What is the purpose of balancing a chemical equation?

Answer 11

To ensure that the number of atoms for each element is the same on both sides of the equation.

Question 12

Fill in the blank: In a synthesis reaction, two or more reactants combine to form a ______.

Answer 12

single product

Question 13

True or False: A decomposition reaction involves a single reactant breaking down into multiple products.

Answer 13

True

Question 14

What is the general form of a combustion reaction?

Answer 14

A hydrocarbon reacts with oxygen to produce carbon dioxide and water.

Question 15

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

Answer 15

They indicate the relative amounts of reactants and products involved in the reaction.

Question 16

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

Answer 16

Decomposition reaction

Question 17

What does the law of conservation of mass state?

Answer 17

Mass is neither created nor destroyed in a chemical reaction.

Question 18

Fill in the blank: In a double displacement reaction, two compounds exchange ______.

Answer 18

ions

Question 19

What is the empirical formula for the compound with a molecular formula of C4H10?

Answer 19

C2H5

Question 20

True or False: The empirical formula and molecular formula of a compound can be the same.

Answer 20

True

Question 21

What is the term for a reaction that absorbs heat from its surroundings?

Answer 21

Endothermic reaction

Question 22

What is the term for a reaction that releases heat into its surroundings?

Answer 22

Exothermic reaction

Question 23

What is the purpose of using a catalyst in a chemical reaction?

Answer 23

To increase the rate of the reaction without being consumed.

Question 24

What is the role of a limiting reactant in a chemical reaction?

Answer 24

It determines the maximum amount of product that can be formed.

Question 25

What is the balanced equation for the combustion of methane (CH4)?

Answer 25

CH4 + 2O2 → CO2 + 2H2O

Question 26

Fill in the blank: A ______ reaction involves the transfer of electrons between species.

Answer 26

redox

Question 27

What is the empirical formula for a compound that contains 40% carbon, 6.7% hydrogen, and 53.3% oxygen by mass?

Answer 27

CH2O

Question 28

True or False: In a redox reaction, one species is oxidized while another is reduced.

Answer 28

True

Question 29

What is the purpose of using a balanced equation in stoichiometric calculations?

Answer 29

To calculate the amounts of reactants and products involved in a reaction.

Question 30

What is the term for the minimum energy required for a chemical reaction to occur?

Answer 30

Activation energy

Question 31

What is the empirical formula for the compound with the molecular formula C8H16?

Answer 31

C4H8

Question 32

Fill in the blank: The process of determining the empirical formula from the percent composition is called ______.

Answer 32

empirical formula determination

Question 33

What type of reaction is represented by the equation: A + BC → AB + C?

Answer 33

Single displacement reaction

Question 34

What is the balanced equation for the reaction of sodium (Na) with chlorine (Cl2)?

Answer 34

2Na + Cl2 → 2NaCl

Question 35

True or False: The empirical formula can provide information about the molecular structure of a compound.

Answer 35

False