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goldenfox [79]
3 years ago
13

Which statement correctly describes a physical change?

Chemistry
1 answer:
MArishka [77]3 years ago
4 0

Answer: Option (b) is the correct answer.

Explanation:

A change which brings no change in chemical composition of a substance is known as a physical change.

For example, melting of ice is a physical change as there occurs change in phase from solid state to liquid state of water. Whereas the structure of water remains the same.

Therefore, we can conclude that the statement which describes a physical change is that it may involve a change in phase but does not involve a change in the molecular structure.

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If 20 grams of zinc reacts with hydrochloric acid, how much zinc chloride is produced?
Oksi-84 [34.3K]
Assuming there is excess acid, the equation for the reaction is Zn + 2HCl -> ZnCl2 + H2.
Mols of zinc = 20/65 (mass/relative atomic mass)
Ratio of Zn : ZnCl2 = 1 : 1
Hence mols of Zinc = mols of Zinc chloride
Mass of ZnCl2 = (20/65)(65+71)
= 41.8g
3 0
4 years ago
"A certain group one metal combines with Hydrogen, to form a molecule with the formula XH. The equilibrium bond length of this c
Tasya [4]

Based on the bond length, the molecular weight of the unknown metal X is 23.

<h3>What are ionic compounds?</h3>

Ionic compounds are compounds which are formed between oppositely charged ions.

When hydrogen combines with the group 1 metals, they form ionic compounds.

The group one metals that combine with hydrogen to firm ionic bonds include:

  • Lithium to give Lithium hydride with equilibrium bond length of 0.239Å.
  • Sodium to give sodium hydride with equilibrium bond length of 1.896Å.
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The molecular weight of lithium is 7 g

The molecularweight of sodium is 23

The molecular weight of Potassium is 39.

Therefore, based on the equilibrium bond length, the molecular weight of the unknown metal X is 23.

Learn more about bond length at: brainly.com/question/3405662

5 0
3 years ago
Force can be added together
Zepler [3.9K]
Forces can be added only when they both are going in the same direction as 2n +2n = 4n of force in the same direction if they are 2 facing forces they would <span>have had to be subtracted, which ever force is greater that will be the momentum of the force.


Hope this helps.</span>
7 0
3 years ago
A 2mL sample of milk has a mass of 8g. What is the density of
In-s [12.5K]
The answer is 4 g/mL
3 0
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Janet wanted to see how much cooler the temperature was at night compared to during the day. What to should she use?
DiKsa [7]
She should use a thermometer.
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