Qwest Review 9/2/15

Question 1

What is cohesion?

Answer 1

When hydrogen bonds hold together the substance. Clinging of same substance to each other. Like to like. Example: Water drop on desk that remains as a droplet instead of spreading out. Also, hydrogen bonding keeps water molecules close to each other, giving water cohesion.

Question 2

What is adhesion?

Answer 2

Clinging of one substance to another. Like to unlike. Example: water droplets clinging to grass or pine needles.

Question 3

What is surface tension?

Answer 3

Surface tension is a measure of how difficult it is to stretch or beak the surface of a liquid. Hydrogen bonding is responsible for water’s surface tension.

Question 4

What is moderation of temperature?

Answer 4

Water moderates air temperature by absorbing heat from air that is warmer and releasing the stored heat to air that is cooler. It occurs when water absorbs heat from air. Water has a high specific temperature, so it takes in energy and a while later the water will finally change.

Question 5

How does the biological hierarchy go? Name smallest to biggest

Answer 5

1) molecules. 2) organelles. 3) cells. 4) tissues. 5) organs & organ systems. 6) organizations. 7) populations. 8) communities. 10) ecosystems. 11) the biosphere

Question 6

What is insulation of bodies water?

Answer 6

When water is in the solid form, it is less dense than when it is in the liquid form. So ice floats on water. If ice sank, then eventually all ponds, lakes, and oceans would freeze making life impossible on earth. On a lake, if the top of it is frozen over, the ice acts as insulation so the water below it won’t freeze and it holds its temperature.

Question 7

What is a universal solvent?

Answer 7

Water is a universal solvent. Water is a very versatile solvent, a quality we can trace to the polarity of the water molecule. A compound doesn’t need to be ionic to be dissolved into water. Polar compounds and nonionic polar molecules can dissolved in water too.

Question 8

What is pH?

Answer 8

pH is a measure of the hydrogen ion concentration of a solution. Study the equations for transferring between pH and H

Question 9

For Mrs. Round, H+ equals what?

Answer 9

H+ = protons

Question 10

What are H+?

Answer 10

Hydrogen ions

Question 11

What are OH-?

Answer 11

Hydroxide ions

Question 12

What do acids do?

Answer 12

Acids donate H+ in aq solutions

Question 13

What do bases do?

Answer 13

Bases accept H+ in aq solutions or donate OH-

Question 14

What are the different types of bonding?

Answer 14

Ionic, covalent, and hydrogen bonding

Question 15

What is ionic bonding?

Answer 15

An ionic bond is the attraction between two oppositely charged ions, such as Na+ and Cl-.

Question 16

What is covalent bonding?

Answer 16

Covalent bonds form when pairs of electrons are shared.

Question 17

What is electro negativity?

Answer 17

Electron negativity is the attraction of an atom for the electrons of a covalent bond.

Question 18

What is a polar molecule?

Answer 18

Not sure

Question 19

How can you distinguish an element from a compound?

Answer 19

An element is a substance made of the same type of atoms while a compound is made of different elements in definite proportions.

Question 20

How can you distinguish a solution from a heterogenous mixture?

Answer 20

In a solution, you can’t see the particles with your eye. With a heterogeneous mixture, you can see the particles.

Question 21

How to tell the number of protons, electrons, and neutrons in an isotope?

Answer 21

Well first remember electrons equal protons in number. So if the number on top of isotope so…

Question 22

Do pH to OH conversions

Answer 22

Okay

Question 23

Name a weak bond and describe it

Answer 23

The van der waals bond. It is weak and occur only when atoms and molecules are very close together. But if there are a lot of them, it can be strong. (All bonds form between molecules and also between parts of a large molecule such as a protein.) The cumulative effect of weak bonds is to reinforce the three dimensional shape of the molecule.