The Arctic’s tundra, though very cold for much of the year, is said to be more strongly defined by its cool summer temperatures, instead of its winter lows. Why?

Because these low summer temperatures can cause a rain-shadow effect

Because these low summer temperatures limit the growth of plants in the summer

Because these low summer temperatures can rapidly changing weather

Because these low summer temperatures chase large land masses of ice that do not even totally melt in the summer.

Answers

Answer 1

Answer: Because these low summer temperatures limit the growth of plants in the summer

Explanation: Took the test!

Answer 2

In an ecosystem, like Arctic's tundra, though very cold for much of year, is said to be more strongly defined by its cool summer temperatures, instead of its winter lows because these low summer temperatures limit growth of plants in summer.

What is an ecosystem?

Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.

Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.

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Related Questions

the square below has anarea of 49ft2 what is the perimeter of the square

Answers

Answer:

28ft

Explanation:

if it's a square then each side is equal

the square root of 49 is 7

each side is 7 ft

7 ft times 4 sides is 28ft

the answer is 98 because you do 49ft2 divided by two and then that would be the answer to one side so to find the answer you multiply that by 4

• Calculate the entropy change when 1.00 mol of
water at 0°C freezes to form ice. (AHfus for water
is +6.02 kJmoll)
1

Answers

Answer:

the enthalpy change of this is 5.02mol

Calculate the pOH for a solution with a hydroxide ion, (OH-) of concentration of 6.49 X 10-11 M.

Calculate the pH.

Note: the answers should have three significant figures

The pOH is: Blank 1

The pH is: Blank 2

Answers

Answer:

Calculate the pOH for a solution with a hydroxide ion, (OH-) of concentration of 6.49 X 10-11 M.

Calculate the pH.

Note: the answers should have three significant figures

The pOH is: Blank 1

The pH is: Blank 2

Explanation:

What is the mass in grams of 5.2 x 1028 atoms of manganese (Mn)?

Answers

The mass, in grams, of 5.2 x 10^28 atoms of manganese would be 0.0006833 grams

Mass calculation

According to Avogadro, 1 mole of any substance contains 6.022 x [tex]10^{23}[/tex] atoms.

Thus, how many moles would be in 5.2 x [tex]10^{28}[/tex]atoms of Mn:

= 6.022 x [tex]10^{23}[/tex] /1 x 5.2 x [tex]10^{28}[/tex]

= 0.00001158 moles

Mass of 0.00001158 moles Mn = 0.00001158 x 54.9

= 0.0006833 grams

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What is the pOH of a
2.6 x 10-6 M H+ solution?

Answers

Explanation:

pOH=-log(2.6×10^(-6)

we get around 5.59

(using log)

In the following acid-base reaction,
HPO42- is the
H2PO4- (aq) + NH3(aq) → HPO42- (aq) + NH4+(aq)
А
B
С
acid
conjugate
acid
conjugate
base

Answers

Taking into account the Brønsted-Lowry acid-base theory, HPO₄⁻² is conjugate base of H₂PO₄⁻.

Brønsted-Lowry acid-base theory

The Brønsted-Lowry acid-base theory (or the Brønsted-Lowry theory) identifies acids and bases based on whether the species accepts or donates protons or H⁺.

According to this theory, acids are proton donors while bases are proton acceptors.

So, reactions between acids and bases are H⁺ proton transfer reactions, causing the acid to form its conjugate base and the base to form its conjugated acid by exchanging a proton.

In other words, a conjugate base is an ion or molecule resulting from the acid that loses the proton, while a conjugate acid is an ion or molecule resulting from the base that gains the proton:

acid + base ⇄ conjugate base + conjugate acid

This case

In this case, you know:

H₂PO₄⁻ + NH₃ → HPO₄⁻² + NH₄⁺

H₂PO₄⁻ behaves like acid because donates an H⁺ proton while NH₃ behaves like base because accepts an H⁺ proton from the acid.

So, NH₄⁺ is the conjugate acid of the NH₃ and HPO₄⁻² is conjugate base of H₂PO₄⁻.

In summary, HPO₄⁻² is conjugate base of H₂PO₄⁻.

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An alternating current can be described as one in which:

A. Electrons flow in both directions in the circuit.
B. Electrons flow in only one direction in the circuit
C. Electrons move only from the negative terminal of the battery.
D. Electrons move only from the positive terminal of the battery.

Answers

Explanation:

electrons flow in both directions

Answer: A I know it but I forgot how to explain it.

How do i solve this?

Draw the product of this reaction. Ignore inorganic byproducts.

Answers

The compound is formed by addition reaction. The product is showed in the image attached.

Addition reaction

mol = M(molar concentration) times V (volume)

0.625 L times 3 mol/L = 1.875 mol

Suppose that a 10-mL sample of a solution is to be tested for I− ion by addition of 1 drop (0.2 mL) of 0.13 M Pb(NO3)2.
What is the minimum number of grams of I− that must be present in order for PbI2(s) ( Ksp=8.49×10−9 ) to form?

Answers

The minimum number of grams of I that must be present is ; 0.01836 * 10⁻³ mol

Given data :

Volume of solution to be tested for I-ion = 10 mL

Volume of Pb(NO₃)₂ = 0.2 mL

molarity of Pb(NO₃)₂ = 0.13 M

Determine the number of I that must be present

First step : calculate conc of PB²⁺ ions in the solution

conc of PB²⁺ ions = ( molarity of Pb(NO₃)₂ * volume of Pb(NO₃)₂ ) / ( total volume )

= ( 0.13 * 0.2 ) / ( 10 + 0.2 )

= ( 0.026 ) / ( 10.2 ) = 0.002549 M

Next step : determine the molarity of I

using the dissociation reaction of PbI₂

PbI₂(s) ---> Pb²⁺ (aq) + 2I (aq)

also; Ksp = [ Pb²⁺ ] [ I ]² ---- ( 1 )

From the question the given value of Ksp = 8.49 * 10⁻⁹

Therefore equation ( 1 ) becomes

8.49 * 10⁻⁹ = ( 0.002549 ) * [ I ]²

[ I ] = √ ( 8.49 * 10⁻⁹ ) / ( 0.002549 )

= 0.0018 M

Final step : Determine the minimum number of grams of I

moles of I = molarity of I * total volume

= 0.0018 M * 10.2 mL

= 0.01836 * 10⁻³ mol

Hence we can conclude that The minimum number of grams of I that must be present is ; 0.01836 * 10⁻³ mol

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What is radioactive dating in chemistry?
PLEASE HELP!!!

Answers

Radioactive dating uses the concept of half life to determine the age of something.
The general idea is that elements exist naturally as a combination of isotopes. Some isotopes are stable while others decay radioactively. The half-life of a radioactive isotope is the time required to reduce the initial quantity of the isotope by 50% through the process of radioactive decay.
Carbon 14 dating works this way. A tree growing in the past would have an equilibrium mixture of C-12 and C-14 atoms in proportions consistent with living matter today. We know this value.
When that tree dies, it no longer accumulates new carbon atoms from carbon dioxide in the atmosphere (through photosynthesis). At this point, the proportion of C-14 in the organic matter that was the tree decreases due to the decay of C-14 to an isotope of nitrogen.
When we dig up the remnants of the tree today, we can measure the proportion of C-14 to C-12 and see how much it has been reduced. From this we can calculate backwards using the half life of C-14 (5730 years) to estimate how old the remains of the tree are.

How many moles of PbCl2 are produced
if 14 moles of AICI3 are consumed?
3Pb(NO3)2 + 2AlCl3
>
3PbCl2 + 2A1(NO3)3

Answers

Answer:21 moles of PbCl2 formed

What is The fmu (grams/mole) for disulfur hexachloride *the formula for it is S2Cl6*

Answers

Hexasulfur Dichloride

Name: Hexasulfur Dichloride

Formula: S2Cl6

Molar Mass:276.848

Example Reactions:

• S2Cl6 + 4H2O = 2SO2 + 6HCl + H2

In cells, __________ are proteins that are needed to lower the amount of energy required to start chemical reactions

Answers

Answer: I think it’s enzymes

Material Storage Facilities means an uncovered area used on a permanent basis for outside

Explanation:

Material Storage Facilities means an uncovered area where bulk materials (liquid, solid, granular, etc.) are stored in piles, barrels, tanks, bins, crates, or other means.

Additional Benchmarks for Federal, State, or Municipal Facilities with Incidental Solid De-Icing Material Storage Facilities monitoring under the requirements of subparagraph (D)(ii) above shall not be subject to Benchmark requirements for Chloride or Cyanide.

Directors are fully briefed on all business related matters, risk assessment and new initiatives proposed by the Company.

As soon as the rope breaks in picture 4, the car continues to roll forward on its own. This motion is BEST explained by which of the following laws? A. AN object in constant motion tends to remain in motion unless acted on by and unbalanced force. B. For every action there is an equal and opposite reaction/ C. An unbalanced force acting on an object will cause the object to accelerate. D. The force of gravity will cause an object to accelerate toward the earth at a constant rate.

Answers

Answer:

what is picture 4 you need to show it

How many people were considered undernourished in Latin America and the Caribbean in 2018?

Question 4 options:

513.9 million

2.6 million

821.6 million

42.5 million

Answers

D . 42.5 million…………

For the reaction shown, find the limiting reactant for each of the initial quantities of reactants 4Cr + 3o2 -> 2Cr2O3 d)14.8 mol Cr; 10.3 mol O2

Answers

Answer: O2

Explanation:

The balanced chemical equation is:

4 Cr + 3 O2 ---> 2 Cr2O3

4 mol of Cr reacts with 3 mol of O2 to form 2 mol of Cr2O3

For 14.8 mol of Cr, 11.1 mol of O2 is required

But we have 10.3 mol of O2

So, O2 is the limiting reagent

PLS HELP FAST!! 50 POINTS AND BRAINLEYIST FOR WHOEVER ANSWERS THIS FASTEST.

In one to two sentences, describe the characteristics of a high-pressure system.

In one to two sentences, explain what biome comprises most of Antarctica and why the continent is described as being part of this biome.

ALSO, IF YOU COPY, PLEASE REWORD SENTENCES.

Answers

A high pressure system has higher pressure at its center than the areas around it

Scientists that work in Antarctica mostly refer to the majority of the continent as being a cold desert

Explanation:

Granite is part of the crust layer of the earth.

True
False

Answers

Answer:

That would be True

Explanation:

granite is a part of the crust layer.

I might be wrong but I think it’s true

Describe how distillation process makes water soft

Answers

Answer:

Distillation can be used to separate and collect a liquid from a solution. Distillation can also be used to soften water as the water evaporates as it is heated and the ions are left behind. Hard water can be softened by adding sodium carbonate (washing soda) or by passing the water through an ion-exchange column.

Explanation:

If a metal reacts violently with water, in which group is it likely to be found?

Answers

Answer:

Alkali metals (Li, Na, K, Rb, Cs, and Fr)

Explanation:

Answer:

Group 1

Explanation:

Alkali metals such as (Lithium, Sodium, Rubidium, Francium, Cesium, etc.) react violently with waterThey are termed "alkali" due to their nature of forming hydroxides on reacting with water

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