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Kryger [21]
3 years ago
6

Which of the following is most clearly an example of a physical change?

Chemistry
1 answer:
kaheart [24]3 years ago
7 0

Physical change is described as the change that affects the form of a chemical compound but not its chemical composition. It involves the change in physical properties.

When a solid is dissolved in the liquid the solid gets dissolved in the liquid there is no breakage in the bonds and same composition of the compounds are at the end of the change. When a solution changes colour due to the addition of an other substance the bonds are broken or formed between molecules or atoms. The substance with a certain set of properties is turned into different substance with different properties. Hence it is a chemical change.

Two liquids producing heat when mixed together results in the temperature change. The heat is produced due to the increase in the temperature. Hence it is a chemical change.

When two solutions are combined gas is released due to the temperature change. This is also a chemical change

Therefore the answer is A.

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The Calcium atom has 2 valence electrons but a Calcium ion will have no electrons because it is a cation ion. Meaning that there are more protons than electrons. Also, the normal calcium symbol is Ca but the calcium ion is Ca²⁺

I hope this wasn't too late

3 0
2 years ago
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They did not repeat their tests multiple times.

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4 0
1 year ago
A solution is prepared by adding 100 mL of 1.0 M HC₂H₃O₂(aq) to 100 mL of 1.0 M NaC₂H₃O₂(aq). The solution is stirred and its pH
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Answer: Option (c) is the correct answer.

Explanation:

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In the give case, when we add the HCl then more number of protons will dissociate. This causes the acetate to react with the protons and leads to the formation of acetic acid.

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Thus, we can conclude that equation H_{3}O^{+}(aq) + C_{2}H_{3}O^{-}_{2}(aq) \rightarrow HC_{2}H_{3}O_{2}(aq) + H_{2}O(l) represents the chemical reaction that accounts for the fact that acid was added but there was no detectable change in pH.

3 0
3 years ago
48 When an atom of the unstable isotope Na-24 decays, it becomes an atom of Mg-24 because the Na-24 atom spontaneously releases(
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Answer:

i think niether

Explanation:

5 0
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