How is a polar molc. like the North and South Poles?

It has siding - Polar Opposites (δ- and δ+)

What is scientific theory?

The best explanation based on a wealth of exp data

Why is Carbon so essential?

It has only 4 electrons in the second shell

Adjacent water molecules are attracted to each other.....

Due to the Polar Covalent bond between O and H

Which elements make up 96% of human body weight?

Oxygen, Nitrogen, Hydrogen, Carbon

Same element, but diff in number of neutrons

Why are the electrons not shared equally in water?

Oxygen is highly electronegative atom, it pulls elect to it

Why do we refrain from the word "Prove" in a hyp based exp.

All variables may not been accounted for in the study

Frozen water is less dense than liquid water due to h-bonds

How are you related to dinosaurs?

Same (recycled) atoms (conservation of matter)

Water fearing (water repelling)

Which is the correct sequence (small to large)

Subatomic particles, atoms, molecules, cells, individuals

An atom contains what?

Protons (+), Neutrons (no charge) and elections (-)

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Bio 104 -Intro to bio & chemistry

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Bio 104

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Questions 25

Answers

1
How is a polar molc. like the North and South Poles?
They are cold
It is not
It has siding - Polar Opposites (δ- and δ+)
2
A Water molecule contains what type of bond?
ionic
hydrogen
non-polar covalent
Polar covalent
3
How does the Chem. chapter related to the topic of Evolution?
Ocean acidification and natural section
Radiometric decay is crucial for dating fossils, earth
All of the above
Radiation as source of mutation
4
What is scientific theory?
a hypothesis
a guess
The best explanation based on a wealth of exp data
the result/conclusion of your experiment
5
Atoms are likely to forms bonds when....
Electrons shells are not full
Electrons shells are full
6
Why is Carbon so essential?
It is very polar
It has only 4 electrons in the second shell
It has only 2 electrons in the second shell
7
Adjacent water molecules are attracted to each other.....
Because water molecules are ions
Due to the Non-Polar Covalent bond between O and H
because water is hydrophobic
Due to the Polar Covalent bond between O and H
8
Acids solutions are what on the pH scale?
7
pH 8 and above - 12
pH 0 - 6
9
Why is polarity crucial for life?
Without polarity, the water in the sea would freeze solid
Allows water to form Hydrogen bonds
All of the above
Without polarity, there would be no water cycle
10
Hydrophobic molecules do/do not hydrogen bond with water?
DO NOT
DO
11
Which elements make up 96% of human body weight?
Oxygen, Gold, Hydrogen, Carbon
Oxygen, Calcium, Hydrogen, Sodium
Oxygen, Calcium, Hydrogen, Carbon
Oxygen, Nitrogen, Hydrogen, Carbon
12
Isotopes are...
Same element, but diff in number of neutrons
Neven a source of radiation damage
Same element, but diff in number of electrons
Not useful medically
13
Why are the electrons not shared equally in water?
Oxygen is highly electronegative atom, it pulls elect to it
Hydrogen is electronegative
14
Why do we refrain from the word "Prove" in a hyp based exp.
All variables may not been accounted for in the study
Nothing can be proven
15
Why does Ice Float?
Frozen water is repelled by non-frozen water
Frozen water is less dense than liquid water due to h-bonds
Frozen water is more dense than liquid water due to h-bonds
Frozen water contains helium
16
Why can some insects "walk" on water?
The hydrogen bonds are not broken
Both answers
Neither is a good explanation
They are light enough not to disrupt surface tension
17
What is the value of many trials in a exp?
minimize uncontrolled variables
Both are correct
reduce likelihood of chance result
18
How are you related to dinosaurs?
Same (recycled) atoms (conservation of matter)
Dinos are not eukaryotes, so we are not related
19
Define hydrophobic
Water loving (water attracting)
Water fearing (water repelling)
20
Which is the correct sequence (small to large)
Subatomic particles, atoms, molecules, cells, individuals
Atoms, Subatomic particles, cells, molecules, individuals
Subatomic particles, atoms, cells, molecules, individuals
21
NaCl (Sodium Chloride) contains what bond?
Non-Polar Covalent
Ionic
Polar Covalent
Hydrogen
22
What part of an atom is involved in chemical reactions?
Neutrons
Nucleus
Protons
Electrons
23
Ahhh....chemistry is killing me.....what to do??
All of the above
Read the chapter (again)
Watch the Online Posted Lecture and films
Ask your instructor for help
24
An atom contains what?
Protons (+), Neutrons (no charge) and elections (-)
Protons (+), and Neutrons (no charge)
Protons (+), Neutrons (-) and elections (-)
Protons (-), Neutrons (no charge) and elections (+)
25
Which is a compound?
H20
N
O2
Gold

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