the diagram shows a model of the nitrogen cycle. which role do plants play in the nitrogen cycle?

Answer:

It's A

Explanation:

Animals get the nitrogen they need by eating plants or other animals that contain nitrogen. When organisms die, their bodies decompose bringing the nitrogen into soil on land or into ocean water. Bacteria alter the nitrogen into a form that plants are able to use.

Answer:Air is a solution made up of many gases. ... There is more nitrogen than any other gas in air, so it is considered the solvent in an air solution.

Explanation:

Explanations:

Question 1: Lithium in 20.00+ g is C. or D., but 25.00+ g is D. which means this is the correct option.

I am unsure of Question 2. I don't think it is mole though.

Question 3: Boron in 25.00-30.00 g is B. or D., but 25.00 g would be C.

Question 4: 2.393 x 1024 atoms of Oxygen is 63.58 mole O. I don't know for sure, but I think this is correct.

I am NOT professional. There is a chance I am incorrect. Please reply to me if I've made a mistake.

Answer:

you mean "jointed." jointed appendages give arthropods much greater movement flexibility and range.

This compound is also known as Calcium Oxide. The SI base unit for amount of substance is the mole. 1 grams CaO is equal to 0.017832495800447 mole. Note that rounding errors may occur, so always check the results.

Hope I helped :)

Answer: When I opened the doc it didn't work..

Explanation:

Explanation:

(a) write a balanced equation for the reaction

CaCO3 + HCl --> CaCl2 + H2O + CO2

The balanced equation is given as;

CaCO3 + 2HCl → CaCl2 + H2O + CO2  

(b) when the reaction was complete, 800 mL of carbon dioxide gas was collected. How many moles of calcium carbonate were used in the creation?

From the balanced reaction;

1 mol of CaCO3 reacts to produce 1 mol of CO2

1 mol of CO2 = 22.4 L of CO2

This means;

1 mol of CaCO3 reacts to produce 22.4L  of CO2

x mol would produce 800ml (0.8 L) of CO2

1 = 22.4

x = 0.8

x = 0.8 * 1 / 22.4 = 0.0357 mol

(c) How many grams of CaCO3 were used?

Mass = Number of moles * Molar mass

Molar mass of CaCO3 = 100.0869 g/mol

Mass = 0.0357 mol * 100.0869 g/mol = 3.57 g

(d) If there was another contaminant in the sample that was not un reactive, would this have caused the percent yield of carbon dioxide to be higher, lower, or the same, explain your answer.

The same

An un reactive contaminant in the sample is most likely a catalyst. Catalysts only affect the rate of reaction. They do not affect yields of products.

Number of Silver atoms : N = 7.8 x 10²² atoms

Given

mass of bracelet : 13.94 g

Required

Number of atoms

Solution

Assuming the bracelet consists entirely of silver

mol of silver :

= mass : molar mass

= 13.94 g : 107,8682 g/mol

= 0.129

Number of atoms :

N = n x No(No = Avogadro's number)

N = 0.129 x 6.02 x 10²³

N = 7.8 x 10²² atoms

Answer:

i dont know how to answer this because u need a pic of what you need

Explanation:

sorry just need a picture to confirm answer

Answer:

well, we have so much better and more tech and we are a lot smarter than we were before.

Explanation:

Answer:

We have way more advanced technology than our ancestors and we have a better idea of how the earth was millions of years ago.

Explanation:

Answer:

slower...............

.

..

Answer:

it'll melt slower

Explanation:

because it needs to get to a higher temperature ig

Answer:

PUT THE TOOTHPAST ON CABBAGE AND CHECK IT OUT AFTER A DAY

Answer:

protons(positively charged) and the neutrons (no charge)

Explanation:

Answer:

The nucleus of an atom contains protons and neutrons.

Answer: Polar bond

Explanation:

Answer:

Se Puede Traducir?

Explanation:

Mmm?

Answer:

i think it is surroundings

Answer:

Your correct it is false

Answer:

90 mL

0.09 Liters

Explanation:

Givens

1 cc of solution = 1 mL

0.75 cc / min needed to go in intravenously.

2 hours needed.

? Liters

Solution

1 hour = 60 minutes

1 hours = 2 * 60 = 120 minutes

rate = 0.75 cc/minute

Liters = rate * time

Liters = 0.75 cc * 120 minutes

Liters = 90 cc

That's not the answer.

1 Liter has 1000 mL or ccs

x Liter has 90 mL          

Equation

1/x = 1000 / 90

Solution

Cross multiply

1000x = 90*1           Divide by 1000

x = 90/1000

x = 0.09 Liters.

Answer:

Argon is a noble gas

Hope this helps

Answer:

Explanation:

c. - vaccine

b. - immunity

d. - phagocyte

f. - b cell

e. - t cells

a. active immunity

Answer:

aksksks

Explanation:ss

x

zxrkkrkrkkrkkrrkr

Answer:

a rotating disk of dust and gases

Explanation:

brainliest?

Answer:  scientists believe that the solar system was formed when a cloud of gas and dust in space was disturbed, maybe by the explosion of a nearby star (called a supernova). ... Squeezing made the cloud start to collapse, as gravity pulled the gas and dust together, forming a solar nebula.

Explanation:

Answer:

All the answers you chose are correct

Explanation:

Answer:

I cant see the fist question but all that you chose are correct

Explanation:

The empirical formula : Na₂Cr₂O₇

Given

170 g sample contains :

29.84 g sodium, 67.49  g chromium, and 72.67 g oxygen

Required

The compound's empirical formula

Solution

mol ratio of elements :

Na : 29.84 : 23 g/mol = 1.297

Cr : 67.49 : 51,9961 g/mol = 1.297

O : 72.67 : 16 g/mol = 4.54

Divide by 1.297

Na : Cr : O = 1 : 1 : 3.5 = 2 : 2 : 7

Answer:

Answer:

The mole ratio of C₄H₁₀ and CO₂ is 2 : 8, which  simplifies to 1 : 4.

Explanation:

The mole ratio is the relative proportion of the moles of products or reactants that participate in the reaction according to the chemical equation.

The chemical equation given is:

2C₄H₁₀ + 13O₂ → 8CO₂ + 10H₂O

Once you check that the equation is balanced, you can set the mole ratios for all the reactants and products. The coefficients used in front of each reactant and product, in the balanced chemical equation, tells the mole ratios.

In this case, they are: 2 mol C₄H₁₀ :  13 mol O₂ : 8 mol CO₂ : 10 mol H₂O

Since you are asked about the mole ratio of C₄H₁₀ and CO₂ it is:

2 mol C₄H₁₀ : 8 mol CO₂ , which dividing by 2, simplifies to

1 mol C₄H₁₀ : 4 mol CO₂, or

1 : 2.

Explanation: