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inna [77]
3 years ago
10

Could someone please help!

Chemistry
1 answer:
bezimeni [28]3 years ago
8 0
Im pretty sure that the current will increase so the answer is A . Hope that helps
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What is a scientific question that can be asked about the insect in the photo?
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The answer is "<span> Does the butterfly primarily visit orange flowers?"

A good scientific question has certain attributes. It ought to have a few answers, ought to be testable. A scientific question is an inquiry that may prompt a speculation and help us in noting the explanation behind some perception. It is an inquiry that may prompt a speculation and help us in noting the explanation behind some perception.
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7 0
2 years ago
.
Mila [183]

Answer:

Explanation:

Half life of Nobelium-253 is 97 seconds . That means after every 97 seconds half of the Nobelium amount will be disintegrated .

Time taken in bringing the sample to laboratory = 291 seconds

291 second = 291 / 97 half life

n = 3

N = N_0 (\frac{1}{2})^n

N₀ is original mass , N is mass after n number of half life.

N = 5 mg x (\frac{1}{2})^3

= .625 mg

Only  0.625 mg of Nobelium-253 will be left .

7 0
3 years ago
The amount of nitrogen in an organic substance can be determined by an analytical method called the Kjeldahl method, in which al
Solnce55 [7]

Answer:

The mass percentage of nitrogen in the sample is 1.96%.

Explanation:

Moles (n)=Molarity(M)\times Volume (L)

21.0 mL of 0.150 M HCl

Moles of hydrogen chloride = n

Volume of hydrogen chloride solution = 21.0 mL = 0.021 L

Molarity of the hydrogen chloride = 0.150 M

n=0.150 M\times 0.021 L=0.00315 mol

NH_3 (aq) + HCl(aq)\rightarrow NH_4Cl ( aq )

According to recation, 1 mole of HCl neutralizes 1 mole ammonia.Then 0.00315 moles of HCl will neutrtalize:

\frac{1}{1}\times 0.00315 mol=0.00315 mol of ammonia

1 mole of ammonia has 1 mole of nitrogen atom . Then 0.00315 moles of ammonia will have = 1 × 0.00315 mol = 0.00135 mol

Mass of 0.00315 moles of nitrogen= 0.00315 mol × 14 g/mol = 0.0441 g

Mass of the sample = 2.25 g

The mass percentage of nitrogen in the sample:

\%=\frac{0.0441 g}{2.25 g}\times 100=1.96\%

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3 years ago
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The total energy can be found by adding the different energies:
628 + 15,600 + 712
= 16.94 kJ
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The law of conservation of energy states that if the system gains heat the surroundings ________?
Arlecino [84]
The surroundings would lose heat.
8 0
3 years ago
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