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In-s [12.5K]
3 years ago
7

Topsoil is considered to be most fertile when it has a

Chemistry
2 answers:
anzhelika [568]3 years ago
5 0
It's D the answer is D
eduard3 years ago
4 0
I believe it is C, high organic matter level.
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The change in enthalpy is the change in heat energy of a reaction and is calculated by (Hint: Hess' Law): Group of answer choice
Stolb23 [73]

Answer:

d. Sum of product enthalpies minus the sum of reactant enthalpies

Explanation:

The standard enthalpy change of a reaction (ΔH°rxn) can be calculated using the following expression:

ΔH°rxn = ∑n(products) × ΔH°f(products) - ∑n(reactants) × ΔH°f(reactants)

where,

ni are the moles of products and reactants

ΔH°f(i) are the standard enthalpies of formation of products and reactants

8 0
3 years ago
2Li + H2SO4=Li2SO4 + H2 How many liters of hydrogen gas, H2 at STP can be produced from 3.0 moles of Li? The molar volume of a g
Gemiola [76]

Answer:

volume of H_2=33.6 litre

Explanation:

Firstly balance the given chemical equation,

2Li + H_2SO_4=Li_2SO_4 + H_2

From the given balance equation it is clearly that,

2 mole of Li gives  1 mole of H2 gas

2 mole Li⇔1 mole H_2

1 mole Li⇔0.5 mole H_2

3 mole Li⇔1.5 mole H_2

hence

3 mole of Li will give 1.5 mole H2 gas

therefore volume of gas produced from 3 mole Li at STP = 1.5\times22.4 \frac{L}{mol}

volume of H2=33.6 litre

7 0
3 years ago
What three kinds of medals are awarded at the Olympic Games?
Serjik [45]
An Olympic decoration is granted to effective contenders at one of the Olympic Amusements. There are three classes of decoration: gold, granted to the victor; silver, granted to the first sprinter up; and bronze, granted to the second sprinter up.
5 0
3 years ago
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In a polar covalent bond, the distribution of common electrons are
amid [387]

In a polar covalent bond, the distribution of common electrons are not shared evenly due to a greater positive charge from one atom's nucleus.Oct 30, 2016

3 0
3 years ago
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A highway engineer is researching de-icing compounds for clearing ice from streets in winter. She wants a compound that has +2 i
wolverine [178]

Magnesium combined with chlorine.

How?

  • Look at the question .Compound has -1 charge in it .Hence it contains Halogen.
  • Looking at the options Option B and C contain Iodine and chlorine i.e halogens .

Now come to metals side.

  • Potassium has valency 1(Look the Electronic configuration below)

\\ \sf\longmapsto 1s^22s^22p^63s^23p^64s^1

Hence it will contain +1 charge which is omitted directly .

Now come to option C.

  • Magnesium has charge +2(Look at EC below

\\ \sf\longmapsto 1s^22s^22p^63s^2

Hence the compound formed is given by

\\ \sf\longmapsto MgCl_2

Hence option C is correct.

3 0
3 years ago
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