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3 years ago

How does a fire extinguisher stop a combustion reaction?

Chemistry

2 answers:

tensa zangetsu [6.8K]3 years ago

7 0

Answer:

In the heat of a fire, it releases a cloud of carbon dioxide that smothers the fire. That is, the gas drives oxygen away from the fire, thus stopping the chemical reaction.

7nadin3 [17]3 years ago

3 0

$\: \huge\begin{gathered} {\underline{\boxed{ \mathcal{\orange{Answer}}}}}\end{gathered}$

Carbon dioxide is heavier than air and does not support combustion. Carbon dioxide extinguishes fire by displacing oxygen or by taking away oxygen from the fire triangle.

Carbon dioxide is also very cold when it comes out of the extinguisher.

Thus, it reduces the temperature of the fuel as well.

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Complete the sentence with the word "element" or "compound. O is a(n)_______ and H2O, is a(n)____

nikdorinn [45]

Answer:

Element; compound

Explanation:

Oxygen is an element on the periodic table, but when it's combined with the element Hydrogen, it produces water, which is a compound (H2O). When two elements combine, it produces a compound.

I hope this helps! :)

8 0

3 years ago

Why is paper towel absorbing water a chemical change

Anastaziya [24]

Answer:

it is not a chemical change

Explanation:

it is a physical change as a paper towel can be dried in the sun to turn into a regular paper towel thus proving that a paper towel absorbing water is a physical change not a chemical change

5 0

3 years ago

Drag the description to the category

viktelen [127]

Answer:

Explanation:

5 0

3 years ago

Titration Volume & Concentration

polet [3.4K]

Answer:

18,1 mL of a 0,304M HCl solution.

Explanation:

The neutralization reaction of Ba(OH)₂ with HCl is:

2 HCl + Ba(OH)₂ → BaCl₂ + 2 H₂O

The moles of 17,1 mL≡0,0171L of a 0,161M Ba(OH)₂ solution are:

$0,0171L*\frac{0,161moles}{L}$ = 2,7531x10⁻³moles of Ba(OH)₂

By the neutralization reaction you can see that 2 moles of HCl reacts with 1 mole of Ba(OH)₂. For a complete reaction of 2,7531x10⁻³moles of Ba(OH)₂ you need:

$2,7531x10^{-3}molBa(OH)_{2}*\frac{2molHCl}{1molBa(OH)_{2}}$ = 5,5062x10⁻³moles of HCl.

The volume of a 0,304M HCl solution for a complete neutralization is:

$5,5062x10^{-3}molHCl*\frac{1L}{0,304mol}$ = 0,0181L≡18,1mL

I hope it helps!

4 0

3 years ago

The average molecular speed in a sample of Ar gas at a certain temperature is 391 m/s. The average molecular speed in a sample o

adoni [48]

Answer:

550 m/s

Explanation:

The average molecular speed (v) is the speed associated with a group of molecules on average. We can calculate it using the following expression.

$v = \sqrt{\frac{3 \times R \times T}{M} }$

where,

R: ideal gas constant

T: absolute temperature

M: molar mass of the gas

We can use the info of argon to calculate the temperature for both samples.

$T = \frac{v^{2} \times M}{3 \times R} = \frac{(391m/s)^{2} \times 39.95g/mol}{3 \times 8.314J/k.mol} = 2.45 \times 10^{5} K$

Now, we can use the same expression to find the average molecular speed in a sample of Ne gas.

$v = \sqrt{\frac{3 \times R \times T}{M} } = \sqrt{\frac{3 \times (8.314J/k.mol) \times 2.45 \times 10^{5}K }{20.18g/mol} } = 550 m/s$

7 0

3 years ago