EXAM #1

Question 1

What type of bond forms molecules?

Answer 1

All of them; covalent, ionic, hydrogen

Question 2

What is the difference between a fact and a hypothesis?

Answer 2

Facts are direct observations; hypotheses are testable explanations.

Question 3

How can predictions be spotted?

Answer 3

Predictions can be spotted because they are “if…then” statements formed from correlating hypotheses.

Question 4

Why does an experiment study the only way to show a cause-and-effect relationship?

Answer 4

Because it manipulates variables

Question 5

What is the purpose of peer review in science?

Answer 5

To address concerns and prevent bias and fraud.

Question 6

What is the main mechanism for policing bias and fraud in science?

Answer 6

Peer review

Question 7

What is the purpose of bans on hunting and chemicals in saving endangered species?

Answer 7

To stop extinction

Question 8

Why can’t a hypothesis be proved with complete certainty?

Answer 8

Testing can support but not proven (you have to support the hypothesis)

Question 9

Which bond is the weakest?

Answer 9

Hydrogen bonds are the weakest

Question 10

What is the universal versatile solvent?

Answer 10

Water is the universal solvent.

Question 11

What is the atomic number of hydrogens?

Answer 11

The atomic number of hydrogens is 1.

Question 12

What element is the basis of life?

Answer 12

Carbon (4 valence electrons). It is the most versatile and an organic element.

Question 13

What does Acid increase?

Answer 13

Acid increases H+ (Hydrogen Ions) concentration.

Question 14

Which bond involves electron SHARING?

Answer 14

Covalent bonds

Question 15

What is the polymer of nucleotides?

Answer 15

Nucleic Acids

Question 16

Lipids are NOT polymers, they are what?

Answer 16

Lipids are macromolecules.

Question 17

Which molecule stores genetic information?

Answer 17

DNA (Deoxyribonucleic Acid)

Question 18

What is the function of enzymes?

Answer 18

Enzymes catalyze reactions; they do this by speeding it up by slowing the activation process

Question 19

Is water hydrophobic?

Answer 19

Water is NOT Hydrophobic, it is Hydrophilic

Question 20

Which bond forms between water molecules?

Answer 20

Hydrogen Bonds

Question 21

Is there such thing as a Metallic Bond?

Answer 21

There is NO such thing as a Metallic Bond.

Question 22

How many bonds can Carbon form?

Answer 22

Carbon can form 4 bonds

Question 23

Which molecule is a simple sugar?

Answer 23

Glucose is a simple sugar

Question 24

What is the role of RNA?

Answer 24

RNA is genetic expression

Question 25

What are proteins made of?

Answer 25

Proteins are made of amino acids.

Question 26

Which molecule is hydrophilic? Water, Fat, Oil or Sugar?

Answer 26

Sugar

Question 27

Which bond involves ion attraction?

Answer 27

Ionic

Question 28

Is DNA double stranded or single stranded?

Answer 28

DNA is double stranded

Question 29

What attracts hydrogen in water?

Answer 29

Oxygen - because oxygen and hydrogen are attracted to each other

Question 30

How many electron shells are in oxygen?

Answer 30

There are 3 electron shells in oxygen.

Question 31

Do lipids include steroids?

Answer 31

Yes, because multiple glycerides (which are lipids) make steroids

Question 32

Which biomolecule is not a polymer? Carbohydrates, Proteins, Lipids or Nucleic Acids

Answer 32

Lipids are not polymers, they are macromolecules

Question 33

What forms around polar molecules?

Answer 33

Hydrogen bonds form around polar molecules.

Question 34

Is RNA single stranded?

Answer 34

Yes, RNA is single stranded

Question 35

How many valence electrons does Nitrogen have?

Answer 35

Nitrogen has 7 valence electrons

Question 36

How many valence electrons does Carbon have?

Answer 36

Carbon has 4 valence electrons

Question 37

How many valence electrons does Hydrogen have?

Answer 37

Hydrogen has 1 valence electron

Question 38

How many valence electrons does Oxygen have?

Answer 38

Oxygen has 6 valence electrons

Question 39

How many valence electrons does Phosphorus have?

Answer 39

Phosphorus has 5 valence electrons

Question 40

How many valence electrons does Sulfur have?

Answer 40

Sulfur has 6 valence electrons

Question 41

What are the "Big 6" main elements?

Answer 41

Carbon, Hydrogen, Nitrogen, Oxygen, Phosphorus and Sulfur

Question 42

Is ice less dense than water?

Answer 42

Yes, ice is less dense than water, that is why it floats.

Question 43

Which molecule is used in energy storage?

Answer 43

Starch (potatoes, pasta)

Question 44

What is the main function of enzymes?

Answer 44

To catalyze

Question 45

Does Carbon form ionic or covalent bonds?

Answer 45

Carbon forms covalent bonds

Question 46

Which acid has a lower pH value? Vinegar, blood, water, or milk?

Answer 46

Vinegar

Question 47

How does salt dissolve in water?

Answer 47

By Ionic attraction

Question 48

Are all molecules' compounds?

Answer 48

No, not all molecules are compounds

Question 49

What's the difference between molecules and compounds?

Answer 49

A molecule is 2 atoms of the same element join together, while a compound is a type of molecule where the atoms forming the molecule are completely different.

Question 50

What increases in an acidic solution?

Answer 50

H+ (Hydrogen Ions)

Question 51

Is water a compound?

Answer 51

Yes, water is a compound