Water Test

Question 1

Ionic Bond

Answer 1

A bond formed between oppositely charged ions

Question 2

Covalent Bond

Answer 2

Bond formed between two atoms sharing electrons

Question 3

Electronegativity

Answer 3

the more electronegative an atom the stronger it attracts shared electrons

Question 4

Is being highly electronegative the same as having a negative charge?

Answer 4

No, being electronegative means you want the electron badly (so usually you would attract them with a positive charge; opposites attract)

Question 5

Is water polar?

Answer 5

Yes water is polar. Caused by shape and unequal sharing of electrons. Hydrogen side is more positively charged and the oxygen side is more negatively charged.

Question 6

Behavior of electrons in hydrogen bonds.

Answer 6

electrons are shared, the positive charge attracts the negative charge however, “O” has a greater pull

Question 7

Electron Behavior in Ionic Bonds

Answer 7

One atom hogs the electrons most of the time

Question 8

Electron behavior in Non-polar covalent bonds

Answer 8

electrons are equally shared

Question 9

electron behavior in polar covalent bonds

Answer 9

although electrons are shared, one atom pulls on them more than the other.

Question 10

You need to find the %change in mass of an object (final mass – initial mass / initial mass)*100%. What type of uncertainty should be reported with this?

Answer 10

Uncertainty of the tool used (i.e. Scale). If there are several uncertainties meaning different tools were used, then you add both uncertainties.

Question 11

A measurement reads 10.1 cm. How many sig figs? What is the uncertainty digit? Report the absolute uncertainty

Answer 11

3 sig figs.

Uncertainty digit: 1 after the decimal (tenths place)

0.1 / 2 = +/- 0.05 cm

Question 12

(85.1 cm +/- 0.5cm ) + (94.2 cm +/- 0.5 cm) =

Answer 12

179.3 cm +/- 1cm

Question 13

(10.0 cm +/- 0.5cm ) x (10.0 cm +/- 0.5 cm) =

%U = (abs u/ measurement) *100%

Answer 13

% U = (0.5cm / 10.0cm) * 100 = 5%

%U = (0.5cm / 10.0cm) *100 =5%

Sum of % U’s -> 5% +5% = 10%

Times measurements -> 10.0cm * 10.0cm = 100.0 cm

Answer: 100.0 cm +/- 10%

Question 14

Is Diatomic Oxygen (O2) polar? Why or why not?

Answer 14

No, O2 is nonpolar, it has no dipole moment. Both oxygens are negatively charged (equal electronegativity) and thus share the electrons.

Question 15

In a single covalent bond _____ pair(s) of electrons are shared.

Answer 15

one

Question 16

Hypotonic, Hypertonic, Isotonic (Along with Plant cell vs Animal cell)

Answer 16

Hypo: lots of water, animal cell is lysed, plant cell turgid

Iso: means “same”, Animal cell is normal, plant cell is flaccid

Hyper: not a lot of water, animal cell shriveled, plant cell plasmolyzed

Question 17

Properties of water

Answer 17

Cohesion & Adhesion

Surface Tension

Thermal properties

Expansion when frozen

Solvent Properties

Question 18

Adhesion vs. Cohesion

Answer 18

Adhesion- 2 different molecules that are attracted to each other

Cohesion- like molecules attracted to each other

Question 19

Evaporative Cooling

Answer 19

As the top layer of the liquid evaporates it takes the kinetic energy is absorbed with it and cools the lower layers

Question 20

Specific Heat

Answer 20

How much heat it takes to make 1g of a substance to change 1 degree (Celsius obvi) (change can be positive or neg)

Question 21

Talk abt Capillary action

Answer 21

water moving through a porous material due to cohesion, adhesion, and surface tension