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Biology > Ch.2 Review > Flashcards

Ch.2 Review Flashcards

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0
Q

Shared pairs of electrons fill the______energy levels of bonded atoms

A

Outermost

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1
Q

Proton

A

Particle with a positive electrical charge

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3
Q

Nucleus

A

Dense center of an atom

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4
Q

Water and carbon dioxide are examples of what

A

Compounds

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5
Q

Neutron

A

Particle with no electrical charge

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5
Q

Electron

A

Particle with a negative electrical charge

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6
Q

Some ions are positively charged, and some ions have no charge

A

False

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7
Q

Covalent bonds are generally very______

A

Strong

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8
Q

Ions usually form when electrons are transferred from one atom to another

A

True

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9
Q

____________are made up of one type of atom

A

Elements

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10
Q

The formation of an ion results in a full outermost energy level

A

True

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11
Q

Two atoms may form several covalent bonds to share several pairs of______

A

Electrons

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12
Q

Compound

A

A substance made of atoms of different elements bonded together in a certain ratio

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13
Q

An atom becomes an ion when it’s number of protons changes

A

False

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14
Q

A molecule is held together by _____bonds

A

Covalent

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15
Q

Polar molecules have two regions with a slight positive charge

A

False

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16
Q

Which property allows water to resist changes in temperature

A

High specific heat

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17
Q

Slightly charged regions of water molecules form hydrogen bonds

A

True

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18
Q

A solution is a mixture of substance that is _______distributed throughout the entire mixture

A

Evenly

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19
Q

“Oil and water don’t mix” because a _______molecule can’t easily dissolve in a polar solvent.

A

Non polar

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20
Q

Water is a polar molecule

A

True

21
Q

Carbon atoms form the building blocks of most living things

A

True

22
Q

Which property of water helps plants to transport water from their roots to their leaves

A

Adhesion

24
Q

Which property causes water to form beads

A

Cohesion

24
Q

Blood plasma is an example of a _______

A

Solvent

25
Q

Carbon’s outer energy level is full

A

False

26
Q

Carbon atoms can form covalent bonds with up to four other atoms

A

True

27
Q

The three basic structures of carbon-based molecules are straight chain, bent chain, and ring.

A

False

28
Q

Carbohydrate

A

Functions:
Provide energy
Examples:
Sugar, starches

29
Q

Lipid

A

Functions:store energy
Examples: fats, oils

30
Q

Protein

A

Functions: source of amino acids linked by peptide bonds
Examples:beans,nuts

31
Q

Nucleic acid

A

Functions: map for making proteins
Examples:DNA RNA

32
Q

Which contains more molecules:

Monomer or Polymer

A

Polymer

33
Q

During a chemical reaction,________break and reform

A

Chemical bonds

34
Q

________are the substances changed during a chemical reaction

A

Reactants

35
Q

Bond energy is the amount of energy it takes to break a bond between two _________

A

Atoms

36
Q

Equilibrium occurs when reactants and products are made at_____________

A

The same rate

37
Q

Not all chemical reactions involve changes in energy

A

False

38
Q

Activation energy Is required for a chemical reaction to start

A

True

39
Q

Some chemical reactions release more energy than they absorb, while others absorb more energy than they release.

A

True

40
Q

Chemical reactions can occur whether or not energy is added to the reactants

A

False

41
Q

An exothermic chemical reaction absorbs more energy than it releases

A

False

42
Q

Substances changed during a chemical reaction

A

Reactants

43
Q

Substances made by a chemical reaction

A

Products

44
Q

Chemical reaction that releases more energy than it absorbs

A

Exothermic reaction

45
Q

Amount of energy that needs to be absorbed for a chemical reaction to start

A

Activation

46
Q

Amount of energy that will break a bond between two atoms

A

Bond energy

47
Q

State reached when reactants and products are made at the same rate

A

Equilibrium

48
Q

Activation energy is the energy required to

A

Start a chemical reaction

49
Q

Which of the following can reduce the amount of energy needed for a chemical reaction to take place

A

Catalyst

50
Q

What happens to the speed of a chemical reaction when a catalyst is present

A

It speeds up

Biology (5 decks)

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