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3 years ago

5

Why can sand stop fire?

2 answers:

nekit [7.7K]3 years ago

7 0

It will cover up all oxygen from the fire. And sand has no natural flammability because it is simply a crushed up mineral, so it can not make the fire any bigger.

Aneli [31]3 years ago

5 0

Because the fire has no oxygen to expand. it's really suffocating it.

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How many moles of boron<br> (B, 10.81 g/mol) are in 37.8<br> grams of boron?<br> [?] moles

madreJ [45]

Answer:

37.8g/ 10.81g/mol = 3.4968...moles

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2 years ago

Which statement correctly contrasts science and pseudoscience

mojhsa [17]

brainly.com/question/1470976 Hope this helps!

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3 years ago

Below are the reduction half reactions for chemolithoautotrophic nitrification, where ammonia is a source of electrons and energ

SSSSS [86.1K]

<u>Answer:</u> The molecules of oxygen gas that will be reduced to water are 42 molecules

<u>Explanation:</u>

We are given:

$E^o_{(NO_2^-/NH_4)}=-0.41V\\E^o_{(O_2/H_2O)}=0.82V$

The substance having highest positive $E^o$ potential will always get reduced and will undergo reduction reaction. Here, oxygen will undergo reduction reaction will get reduced.

$NH_4$ will undergo oxidation reaction and will get oxidized.

Substance getting oxidized always act as anode and the one getting reduced always act as cathode.

The half reactions follows:

<u>Oxidation half reaction:</u> $NH_4\rightarrow NO_2^-+6e^-$ ( × 4)

<u>Reduction half reaction:</u> $O_2+4e^-\rightarrow 2H_2O$ ( × 6)

<u>Overall reaction:</u> $4NH_4+6O_2\rightarrow 4NO_2^-+12H_2O$

We are given:

Molecules of $NH_4$ = 28

By Stoichiometry of the reaction:

4 molecules of $NH_4$ reacts with 6 molecules of oxygen gas

So, 28 molecules of $NH_4$ will react with = $\frac{6}{4}\times 28=42$ molecules of oxygen gas

Hence, the molecules of oxygen gas that will be reduced to water are 42 molecules

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3 years ago

What is the concentration of a solution which is 2g in 150cm3 in g/dm3

Irina-Kira [14]

Answer:

13.33 g/dm³

Explanation:

Concentration (g/dm³)= mass(g) ÷ volume (dm³)

Now you need to convert 150 cm³ to dm³

1000cm³ = 1 dm³

thus, 150 cm3= 150 ÷ 1000

= 15dm³

and you already have mass in grams

so concentration = 2 ÷ 0.15

= 13.33 g/dm³ and there you go.. solved ;)

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2 years ago

2+2=? -1 3 quick math

tino4ka555 [31]

EVERYDAY MANS ON THE BLOCK. Lol its 4. You got this from Mans Not Hot, didn't you? xD

4 0

3 years ago

Read 2 more answers