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Dmitry_Shevchenko [17]
4 years ago
7

How could the survivors about starting a fire?

Chemistry
1 answer:
joja [24]4 years ago
6 0

Answer:

The ancient Greeks believed that fire was one the four basic elements that composed all things in the universe. In the mythology of virtually every culture, fire is a sacred substance that gives life or power. Fire is not, in fact, a substance. When you gaze at the leaping flames of a campfire, you’re observing not an object, but a process – a chemical reaction. It’s the same chemical reaction that occurs when a cut apple left on the counter turns brown, when silver tarnishes or when an iron nail rusts.

That process is oxidation: combining oxygen with another substance. The defining difference between a fire and your half-eaten apple is speed: fire is an oxidation process that happens very fast, so that light, heat and sound are released — often with enough force and majesty to justify the ancients’ reverence.The sudden release of energy causes temperatures to rise, sometimes by thousands of degrees. And it also results in smoke, the toxic waste of fire’s leftovers.

The fire triangle and the fire tetrahedron

Fire TetrahedronThe fire triangle identifies the three needed components of fire:

fuel (something that will burn)

heat (enough to make the fuel burn)

and air (oxygen)

Explanation: i hope this helps sry its long

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1. In a polar covalent bond,
sveticcg [70]
In a polar covalent bond, there is an unequal sharing of electrons between atoms. If there is equal sharing otherswise it is considered polar covalent. The answer for 1) is D. Water has a higher boiling point because of the strong attraction between polar water molecules due to hydrogen bonding. Answer for 2 is D.
3 0
3 years ago
332 mL of phosphorus vapour weighs 0.155 g at 527 °C and 1bar pressure. What is the molar mass of phosphorus?
matrenka [14]

Answer:

124.98

Explanation:

The molar mass of phosphorus, M=PVwRT=1×34.05×10−30.0625×0.08314×819=124.98.

7 0
4 years ago
There are 30.974 grams of phosphorus in one mole. approximately how many atoms of phosphorus are there in one mole? (5.01) 6.02
koban [17]

There are approximately 6.02 × 10²³ atoms of phosphorus in one mole of 30.974 grams of phosphorus (option A).

<h3>How to calculate number of atoms?</h3>

The number of atoms of a substance can be calculated by multiplying the number of moles of the substance by Avogadro's number. That is;

no of atoms = no of moles × 6.02 × 10²³

According to this question, there are 30.974 grams of phosphorus in one mole of phosphorus. The number of atoms can be calculated as follows:

no of moles of P = 30.974g ÷ 31g/mol = 0.99mol

number of atoms = 0.99 mol × 6.02 × 10²³

number of atoms = 6.02 × 10²³ atoms

Therefore, there are approximately 6.02 × 10²³ atoms of phosphorus in one mole of 30.974 grams of phosphorus.

Learn more about number of atoms at: brainly.com/question/8834373

#SPJ1

5 0
2 years ago
Which of the following factors affect the vapor pressure of a liquid? Check all that apply. View Available Hint(s) Check all tha
trasher [3.6K]

Answer:

Vapour pressure of liquid is affected by its TEMPERATURE, TYPE OF LIQUID, ADDITION OF SOLUTES.

Explanation:

Vapor pressure is the pressure exerted by a vapor in equilibrium with its liquid. Mathematically, the vapor pressure of liquid is written as:

In (Pvap) = -ΔHvap / R * (1/T) + C

ΔHvap is the enthalpy of vaporization and it is constant for specific liquid, T is the temperature and C is a constant. Temperature therefore affect the vapor pressure of a liquid as increase in temperature can cause an increase in vapor pressure.

The type of liquid also affect the vapor pressure. If the molecules bind to each other strongly in the liquid, it increases vapor pressure to be exerted by the liquid but if the type of liquid is one with weak forces of attraction, the vapor pressure is reduced.

Addition of solute to the liquid increases the boiling temperature of liquids thereby reducing it's vapor pressure.

6 0
3 years ago
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