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faltersainse [42]
2 years ago
14

What important points do you need to remember about combustion?

Chemistry
1 answer:
goldenfox [79]2 years ago
7 0

Explanation:

A substance burning in the presence of oxygen and leads to the formation of heat and light is called combustion.

Some important points about combustion are as follows:

  • Fuel should be present for burning.
  • Air should be present for the supply of oxygen.
  • There should be heat (or ignition temperature) to initiate the chemical reaction.
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Which of the following identifies the number and location of protons in a lithium atom
bezimeni [28]
The number of protons is the atomic number
6 0
3 years ago
When salt is dissolved in water, what happens to the water
choli [55]

Answer:

<em>When salt is dissolved in water</em>, many physical properties change, among them the so called colligative properties:

  • The vapor pressure of water decreases,
  • The boiling point increases,
  • The freezing point decreases, and
  • Osmotic pressure appears.

Explanation:

Colligative properties are the physical properties of the solvents whose change is determined by the number of particles (moles or ions) of the solute added.

The colligative properties are: vapor pressure, boiling point, freezing point, and osmotic pressure.

<u>Vapor pressure</u>:

The vapor pressure is the pressure exerted by the vapor of a lquid over its surface, in a closed vessel.

The vapor pressure increases when a solute is added, because the presence of the solute causes less solvent molecules to be near the surface ready to escape to the vapor phase, which means that the vapor pressure is lower.

<u>Boiling point</u>:

The boiling point is the temperature at which the vapor pressure of the liquid equals the atmospheric pressure. Since we have seen that the vapor pressure of water decreases when a solute occupies part of the surface, now more temperature will be required for the water molecules reach the atmospheric pressure. So, the boiling point increases when salt is dissolved in water.

<u>Freezing point</u>:

The freezing point is the temperarute at which the vapor pressure of the liquid and the solid are equal. Since, the vapor pressure of water with salt is lower than that of the pure water, the vapor pressure of the liquid and solid with salt will be equal at a lower temperature. Hence, the freezing point is lower (decreases).

<u>Osmotic pressure</u>:

Osmotic pressure is the additional pressure that must be exerted over a solution to make that the vapor pressure of the solvent in the solution equals the vapor pressure of the pure solvent. This additional pressure is proportional to the concentration of the solute: the higher the salt concentration the higher the osmotic pressure.

6 0
3 years ago
Elias read a book about California earthquakes. He then wrote a three-
Cloud [144]
C. Summarizing
He read the book, then summarized what he read in his report.
4 0
3 years ago
The reduction of ketone groups, such as those present on coq, produces alcohols. in contrast, oxidation of aldehydes produces wh
nevsk [136]

On oxidation of aldehydes produces carboxylic acid functional group.

The product of oxidation of aldehydes depends upon whether the reaction occur in acidic medium or alkaline condition.

If oxidation of aldehydes occurs under acidic condition the product is carboxylic acid but if oxidation of aldehydes occurs under alkaline condition then reduce as well as oxidized product obtained which is known as disproportional product.

The  oxidation of aldehydes occur through potassium dichromate, potassium permanganate or many more. The oxidation of aldehydes in the presence of base is known as cannizzaro's reaction.

learn about oxidation

brainly.com/question/16976470

#SPJ4

7 0
1 year ago
Mount St. Helens is a volcano that erupted with great force in 1980. Which phrase best describes this eruption?
AleksAgata [21]

Answer:The best phrase which supports the eruption would be high-viscosity magma lava broken into fragments.

5 0
3 years ago
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