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Masteriza [31]
3 years ago
14

A liquid is cooled during an investigation causing it to solidify. Which of the following most likely occurred?

Chemistry
1 answer:
zaharov [31]3 years ago
4 0

Answer:

This question lacks options, the options are;

A. Absorption of heat

B. A chemical change

C. A physical change

D. Formation of a new compound

The answer is C. A physical change

Explanation:

A physical change is a type of change that does not involve the chemical composition of the substance(s) involved. Physical changes affect the form but not the chemical content of a substance. Examples of physical changes are freezing, change of state, boiling etc.

In this question, a liquid is cooled during an investigation causing it to solidify. The cooling of this liquid represents a PHYSICAL CHANGE because the liquid state of the substance is only changed to a solid state but does not involve changing the chemical composition of the substance.

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Static electricity is the answer
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4 years ago
What is the oxidation state of S in so ??​
Marina86 [1]

Answer:

+2

Explanation:

If a compound SO existed, we would identify the oxidation state of sulfur using the following logic:

  • oxygen is more electronegative than sulfur, so it's more electron-withdrawing and it should have a negative oxidation state producing a positive oxidation state for sulfur;
  • oxygen typically has an oxidation state of -2;
  • we may then apply the fact that SO is expected to be a molecule with a net charge of 0;
  • if the net charge is 0 and the oxidation state of oxygen is -2, we may set the oxidation state of S to x;
  • write the equation for the net charge of 0 by adding all individual charges of the two atoms: x + (-2) = 0;
  • hence, x = 2.

That said, in this hypothetical compound S would have an oxidation state of +2.

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3 years ago
What is one product of a condensation reaction between two amino acids, such as glycine and alanine?
Ipatiy [6.2K]

Answer:

Gly-Ala

(Dipeptide).

Explanation:

A condensation reaction is a reaction in which two molecules combine to form a single molecule with the loss of a small molecule e.g water.

When two amino acids, such as alanine and glycine react, they yield a mixture of dipeptides (via dipeptide bond) and water. That is, The −OH from the carboxyl group (-COOH) of one amino acid combines with a hydrogen atom from the amine group (-NH2) of the other amino acid to produce water.

3 0
3 years ago
Ancient cyanobacteria released ______, which assisted in creating the atmosphere as we know it today.
andrey2020 [161]

Answer;

- Oxygen

-Ancient cyanobacteria released oxygen, which assisted in creating the atmosphere as we know it today.

Explanation;

-The oxygen atmosphere that we depend on was generated by numerous cyanobacteria during the Archaean and Proterozoic Eras.

-Cyanobacteria are aquatic and photosynthetic, meaning they live in the water, and can manufacture their own food. During the process of photosynthesis, energy from sunlight is used together with carbon (iv) oxide and water to form organic molecules that serve as nutrients for the organisms and also oxygen gas is released to the atmosphere.

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4 years ago
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Zolol [24]

Answer:

Helium is lighter than Hydrogen and Helium is a much safer gas.

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4 years ago
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