Energy and Chemical Reactions

Question 1

Reactants

Answer 1

Substances that enter chemical reactions

Question 2

Products

Answer 2

Substances produced by chemical reactions

Question 3

Activation Energy

Answer 3

Enzymes lower the amount of activation energy
necessary for a reaction to begin in living systems.

Question 4

Oxidation Reduction Reactions

Answer 4

A chemical reaction in which electrons are
exchanged between atoms is called an
oxidation-reduction reaction.

Question 5

Polarity

Answer 5

Water is considered to be a polar molecule due to an
uneven distribution of charge.

The polarity of water makes it effective at
dissolving other polar substances such as sugars,
ionic compounds, and some proteins.

Question 6

Hydrogen Bonding

Answer 6

A hydrogen bond is the
force of attraction
between a hydrogen
molecule with a partial
positive charge and
another atom or
molecule with a partial or
full negative charge.

Question 7

Cohesion

Answer 7

is an attractive force that holds
molecules of a single substance together, such as
water molecules.

Question 8

Adhesion

Answer 8

is the attractive force between two
particles of different substances, such as water
molecules and glass molecules.

Question 9

Solutions

Answer 9

A solution consists of a solute dissolved in a
solvent.

Question 10

Acids

Answer 10

Acidic solutions contain more hydronium ions
than hydroxide ions.

Question 11

Bases

Answer 11

Basic solutions contain more hydroxide ions than
hydronium ions.

Question 12

pH

Answer 12

Scientists have developed a scale for comparing
the relative concentrations of hydronium ions and
hydroxide ions in a solution. This scale is called
the pH scale, and it ranges from 0 to 14.

A high ph is a natural immune system

higher ph more basic lower ph more acidic

Question 13

Buffers

Answer 13

A buffer solution is a solution that resists change with ph