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Writing an Academic Paper — Unit test Answers

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Write a paragraph explaining how adhesion, cohesion, and capillary action all enable water to go from the roots to the top of a tall tree.

Answer:

To transport water from the roots to the leaves of a tall tree, plants rely on the unique properties of water caused by its polar nature and hydrogen bonds. Cohesion is the attraction that makes water molecules stick to one another, creating a continuous water column. Adhesion is the attraction between water molecules and the walls of the tree's xylem vessels, which helps the water move against gravity. These two forces work together to produce capillary action, allowing water to climb upward. As water evaporates from the leaves, it pulls the entire column of water up from the roots.

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Which terms and phrases did you include in your response? Check all that apply.polar bondhydrogen bondstick or attractionagainst gravityleaves or rootsother

A
polar bond
B
hydrogen bond
C
stick or attraction
D
against gravity
E
leaves or roots
F
other
3

By which process does water vapor become a cloud?

A
evaporation
B
transpiration
C
condensation
D
precipitation
4

What causes an ionic bond to form between sodium and chlorine?

A
Sodium and chlorine atoms share electrons.
B
Sodium and chlorine atoms switch electrons.
C
Sodium atoms gain electrons.
D
Sodium atoms donate electrons.
5

What does the chemical formula C3H6O2 tell about a molecule of the compound it represents?

A
It is made up of 3 atoms of 11 different elements.
B
It is made up of 11 atoms joined in a straight line.
C
It is made up of 11 total atoms of 3 different elements.
D
It is made up of 1 atom composed of 3 different elements.
6

Sublimation is the opposite of deposition just as evaporation is the opposite of

A
fusion
B
transpiration
C
freezing
D
condensation
7

Which is the only element in group 1 on the periodic table that forms covalent bonds?

A
hydrogen
B
lithium
C
potassium
D
sodium
8

What is a limitation of using a chemical formula, such as C6H12O6, to represent a compound?

T
The chemical formula does not show the types of elements that make up the compound.
T
The chemical formula does not show how the atoms are connected to one another.
T
The chemical formula does not show the number of atoms of each element in a molecule.
T
The chemical formula does not show the chemical symbols of the elements in the compound.
9

What would happen to life on Earth if all the liquid fresh water were used up?

A
All organisms would adapt to using salt water.
B
Organisms would carry out life functions without water.
C
Animals would be affected, but some desert plants would survive.
D
Life could no longer exist on Earth.
10

Giovanni created this chart to study for an exam.Which best describes how to correct the error in the chart?

Question illustration
A
Remove “plastics” from the uses for sodium hydroxide.
B
Swap the uses for iron oxide and calcium carbonate.
C
Change the use for calcium chloride to “used in preservatives.”
D
Add “de-ice roads” to uses for calcium carbonate.
11

Which term best describes all atoms in ionic bonds?

A
stable
B
unstable
C
positively charged
D
negatively charged
12

Suna passes an electric current through a sample of clear, colorless, and odorless liquid. As the experiment continues, bubbles form, and the volume of liquid decreases. Suna collects samples of two colorless, odorless gases that bubble out of the liquid. One of the gases burns. Neither the original liquid nor the other gas burns.Which is the best explanation of her results?

A
The electric current changed some of the sample to gas even though the sample was not breaking down. Therefore, the original liquid is a compound.
B
The electric current released a gas that was odorless and colorless, like the original sample. Therefore, the original liquid is an element.
C
The sample was broken down by the electric current and formed a new substance that could burn. Therefore, the original liquid is a compound.
D
The sample lost some of its volume, but the gas still had the same chemical makeup as the original sample. Therefore, the original liquid is an element.
13

How many atoms of each element are in the chemical formula NH4NO3?

A
1 nitrogen, 1 hydrogen, and 3 oxygen
B
1 nitrogen, 4 hydrogen, and 3 oxygen
C
2 nitrogen, 4 hydrogen, and 3 oxygen
D
5 nitrogen, 1 hydrogen, and 1 oxygen
14

How do the nuclei of covalently bonded atoms help keep the bond together?

A
Neutral particles in the nucleus provide enough mass that the force of gravity holds the atoms together.
B
Neutral particles in the nucleus can become positive or negative in order to balance the charges.
C
Positive particles in the nucleus change into negative particles that enter electron shells.
D
Positive particles in the nucleus are attracted to shared electrons, so the atoms stay close together.
15

The element sulfur (S) is most likely to form covalent bonds with the element

A
helium (He).
B
magnesium (Mg).
C
zinc (Zn).
D
oxygen (O).

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