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andrew11 [14]
3 years ago
5

Please help! USATestprep K12

Chemistry
2 answers:
NeX [460]3 years ago
8 0

Answer:

its none above

Explanation:

food webs have arrows that show the flow of energy from one orhganism to the next

bar graphs have bars and numbers and diagrams have words and pictures so it D

ycow [4]3 years ago
6 0

Answer: C

Explanation:

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List all wether
nignag [31]

Explanation:

Agricultural productivity is dependent on Co2, Temperature, Solar Radiation, Precipitation, Soil Moisture and Wind Direction. Changes in any or all of these elements has a direct impact on the crop production.

7 0
3 years ago
QUESTION 4<br> Balance this chemical equation. A H2S + B Ag ---&gt; C Ag2S + DH2
photoshop1234 [79]

Answer:

1H2S + 2Ag --> 1Ag2S + 1H2

Explanation:

1H2S + 2Ag --> 1Ag2S + 1H2

You only have to make sure to have the same amount of each element in each side of your chemical equation

7 0
3 years ago
A 1.59 mol sample of Kr has a volume of 641 mL. How many moles of Kr are in a 4.41 L sample at the same temperature and pressure
Marina86 [1]

Answer:

The correct answer is 10.939 mol ≅ 10.94 mol

Explanation:

According to Avogadro's gases law, the number of moles of an ideal gas (n) at constant pressure and temperature, is directly proportional to the volume (V).

For the initial gas (1), we have:

n₁= 1.59 mol

V₁= 641 mL= 0.641 L

For the final gas (2), we have:

V₂: 4.41 L

The relation between 1 and 2 is given by:

n₁/V₁ = n₂/V₂

We calculate n₂ as follows:

n₂= (n₁/V₁) x V₂ = (1.59 mol/0.641 L) x 4.41 L = 10.939 mol ≅ 10.94 mol

5 0
2 years ago
Chemistry is the definition​
KIM [24]

Answer:

the branch of science that deals with the identification of the substances of which matter is composed; the investigation of their properties and the ways in which they interact, combine, and change; and the use of these processes to form new substances.

Explanation:

Hope this helps. :)

8 0
3 years ago
Identify each of the following half-reactions as either an oxidation half-reaction or a reduction half-reaction.
koban [17]

Answer:

Cu+(aq)--->Cu2+(aq) + e- : oxidation

reason: there is loss of electrons.

I2(s) + 2e--->2I-(aq) : reduction

reason: There is reduction of electrons.

5 0
3 years ago
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