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snow_lady [41]
2 years ago
13

Which substance gives heat and light after combustion?

Chemistry
1 answer:
Mariulka [41]2 years ago
7 0

Answer:

Magnesium oxide

Explanation:

The substance which undergoes combustion is said to be combustible.It is called fuel. If a magnesium ribbon is heated,it starts burning. When a magnesium ribbon burns,it combines with the oxygen of air to form magnesium oxide,and liberates heat and light.

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Burning of paper is chemical change why? write with reaction. ​
Jet001 [13]

Answer:

Burning of paper is not a physical change.It is chemical change as ash is formed in the process which is new compound and oxides of carbon are also released during the process!

4 0
3 years ago
What is the relationship between concentration and rate of reaction?
marshall27 [118]

Explanation:

<em>The</em><em> </em><em>answer</em><em> </em><em>is</em><em> </em><em>directly</em><em> </em><em>proportional</em><em>, </em><em>because</em><em> </em><em>when</em><em> </em><em>there</em><em> </em><em>is</em><em> </em><em>more</em><em> </em><em>concentration</em><em> </em><em>their</em><em> </em><em>will</em><em> </em><em>more</em><em> </em><em>reactants</em><em> </em><em>to</em><em> </em><em>react</em><em> </em><em>fast</em><em> </em><em>diring</em><em> </em><em>the</em><em> </em><em>chemical</em><em> </em><em>reaction</em><em> </em><em>which</em><em> </em><em>increases</em><em> </em><em>the</em><em> </em><em>rate</em><em> </em><em>of</em><em> </em><em>chemical</em><em> </em><em>reaction</em><em>. </em>

<em>So</em><em>,</em><em> </em><em>we</em><em> </em><em>can</em><em> </em><em>state</em><em> </em><em>that</em><em> </em><em>the</em><em> </em><em>relationship</em><em> </em><em>between</em><em> </em><em>them</em><em> </em><em>are</em><em> </em><em>directly</em><em> </em><em>proportional</em><em>. </em>

<em><u>Hope</u></em><em><u> </u></em><em><u>it helps</u></em><em><u>.</u></em><em><u>.</u></em><em><u>.</u></em>

4 0
3 years ago
You begin pouring sodium chloride into a glass of water. For a long time, the sodium chloride just dissolves in the water, but s
Gennadij [26K]

Answer:

  • Option D:<u><em> The water is saturated</em></u>

Explanation:

Solubility is the term used to designate the maximum amount of a solute that can be dissolved in a given amount of solvent, at a given temperature and pressure.

At start, you begin with pure water in the glass. This water is a pure substance, not a solution.

When <em>you begin pouring sodium chloride into the glass of water,</em> a solution, i.e. a homogenous mixture of solute and solvent, is formed.

This solution, at first, is diuted, which means that it contanins just few grams (matter) of the solute dissolved.

As, more sodium chloride is dissolved, the solution becomes more concentrated but is unsaturated. At some point, the water cannot dissolve more sodium chloride, because it has reached the maximum amount that can contain at that temperature and pressure. Then, the solution is saturated.

You can tell that the water is saturated, ie it contaiins the maximum amount of sodium chloride that can be dissolved, by that amount of water, at the given temperature, because from that point, you will note that <em>as you pour more sodium chloride, it begins to pile up at the bottom of the glass</em>. Hence, the true statement is the letter D: <u><em>the water is saturated.</em></u>

5 0
3 years ago
What mass of methane (CH4) gas occupies a volume of 0,462 L at 1atm and 273K
LiRa [457]

Explanation:

Since methane gas is at 1 atm and 273 K, it is at standard temperature and pressure(STP).

One mole of every gas occupies 22.4 dm^3 at STP, and vice versa. So,

22.4 dm^3 at STP of CH4=1 mol=12+4(1)=16 g

0.462 L(0.462 dm^3) at STP of CH4

=(16 g×0.462 dm^3)/22.4 dm^3

=0.33 g

6 0
2 years ago
How many atoms of phosphorus are in 9.20 mol of copper(II) phosphate?
Anika [276]
The number of atoms of phosphorus in copper (II) phosphate [Cu3 (PO4)2] is determined by multiplying first 9.20 by 2 since there are two phosphorus atoms in the compound and multiplying again with Avogadro's number. The answer is 1.108 x 10^25 atoms. 
4 0
2 years ago
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