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Roman55 [17]
3 years ago
7

Examples of elements​

Chemistry
1 answer:
DedPeter [7]3 years ago
5 0
Oxygen, carbon, hydrogen, nitrogen, aluminum
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What is the key difference between a liquid and a gas?
qaws [65]

Answer :

The key differences between a liquid and the a gas is,

  • Shape and volume :

A liquid has no fixed shape but it has a volume.

A gas has neither a fixed shape nor a volume.

  • Inter-molecular space :

A liquid has more inter-molecular space between the molecules.

A gas has larger inter-molecular space between the molecules as compared to the liquids.

  • Inter-molecular attraction :

A liquid has some Inter-molecular attraction between the molecules because of the low Inter-molecular spacing between the molecules.

A gas has very low or minimum Inter-molecular attraction between the molecules because of the larger Inter-molecular spacing between the molecules.

  • Fluidity :

A liquid flow from the higher to the lower region but a gas flow in all the direction.

3 0
3 years ago
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How many milliliters of an aqueous solution of 0.227 M sodium carbonate is needed to obtain 3.55 grams of the salt?
Marianna [84]

Answer:

147.6 mL .

Explanation:

sodium carbonate , Na₂CO₃

Molecular weight = 106

3.55 gm of sodium carbonate = 3.55 / 106

= .0335 moles

Let the volume of litre required = V

V litre of .227 M solution will contain

V x .227 moles of sodium carbonate . So

V x .227 = .0335

V = .1476 L

= 147.6 mL .

8 0
3 years ago
What are the requirements for combustion of a candle?
cestrela7 [59]
For a candle to burn, it requires a spark, which provides the activation energy for the oxidation reaction of the hydrocarbon making the candle.
It also requires oxygen to facilitate the oxidation of the hydrocarbon.
Therefore the two main requirements of combustion of a candle are oxygen and a spark (or an initial flame)
7 0
3 years ago
Alice and Marge are studying the properties of matter. The girls cut some silver-colored magnesium sheets into 3-inch long strip
frosja888 [35]
<span>B) Magnesium reacts in acids</span>
4 0
2 years ago
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A sample of iron absorbs 67.5 j of heat upon which the temperature of the sample increases from 21.5 °c to 28.5 °c. if the speci
asambeis [7]
Q = mcΔθ

67.5 = m x 0.45 x (28.5 - 21.5)

M = 67.5 / 3.15
= 21.4 g
3 0
3 years ago
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