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vesna_86 [32]
3 years ago
9

Water is believed to be one of the best fire extinguishers then why it is so that fire in oil spills over ocean/sea is difficult

to douse? Choose the most appropriate explanation.
a. Water has no effect on the Ignition temperature of oil
b. Oil is less dense than water and thus continues to undergo combustion
c. Density of oil and water has no bearing on the nature of fire and hence on the
extinguisher
d. All above statements are correct explanation for the given statement
Chemistry
1 answer:
Eddi Din [679]3 years ago
6 0

Answer:

D

Explanation:

Trust me

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True or False, Substances have different properties?
4vir4ik [10]
True.....................................
7 0
3 years ago
Read 2 more answers
Consider that calcium metal reacts with oxygen gas in the air to form calcium oxide. suppose we react 7.43 mol calcium with 4.00
Natali [406]
The balanced chemical equation for the above reaction is as follows;
2Ca + O₂ --> 2CaO
stoichiometry of Ca to O₂ is 2:1
this means that 2 mol of Ca reacts with 1 mol of O₂.
If O₂ is the limiting reactant, 
4 mol of O₂ should react with (4x2) - 8 mol of Ca
however only 7.43 mol of Ca is present. Therefore Ca is the limiting reactant.
7.43 mol of Ca reacts with - 7.43/2 = 3.715 mol of O₂
therefore there's excess O₂₂ remaining after the reaction
Since Ca is the limiting reactant, it is fully used up in the reaction and there is no Ca remaining after the reaction is completed.


4 0
3 years ago
An acetylene tank has a volume of 390.0 L. It is stored at a temperature of 23.5 °C and has a
xeze [42]

Considering the ideal gas law,  there are 279.42 moles of acetylene in the tank.

<h3>Definition of ideal gas</h3>

Ideal gases are a simplification of real gases that is done to study them more easily. It is considered to be formed by point particles, do not interact with each other and move randomly. It is also considered that the molecules of an ideal gas, in themselves, do not occupy any volume.

<h3>Ideal gas law</h3>

An ideal gas is characterized by three state variables: absolute pressure (P), volume (V), and absolute temperature (T). The relationship between them constitutes the ideal gas law, an equation that relates the three variables if the amount of substance, number of moles n, remains constant and where R is the molar constant of gases:

P×V = n×R×T

<h3>Moles of acetylene</h3>

In this case, you know:

  • P= 1765 kPa= 17.4192 atm (being 101.325 kPa= 1 atm)
  • V= 390 L
  • n= ?
  • R= 0.082 \frac{atmL}{molK}
  • T= 23.5 °C= 296.5 K (being 0 °C= 273 K)

Replacing in the ideal gas law:

17.4192 atm× 390 L = n×0.082 \frac{atmL}{molK}× 296.5 K

Solving:

n=\frac{17.4192 atmx 390 L}{0.082 \frac{atmL}{molK}x296.5 L}

<u><em>n= 279.42 moles</em></u>

Finally, there are 279.42 moles of acetylene in the tank.

Learn more about ideal gas law:

brainly.com/question/4147359

4 0
2 years ago
according to the law of conservation of energy, when a lawn mower uses 750 J of chemical energy from gasoline, how much of this
statuscvo [17]
Conservation of energy
all of it should be transformed since the energy is convserved (neither destroyed nor created)
so answer is B
7 0
3 years ago
Why do we have to write the background of the study​
lesya [120]

Answer:

Writing down background information can help you to remember what you learned and can be used for notes in the future when taking an assessment.

Explanation:

Can I get brainliest? It's for a challenge

6 0
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