Which substance cannot be separated physically or chemically? a solution an element a compound a mixture
2 answers:
<u>Answer:</u> The substance that cannot be separated physically or chemically is an element.
<u>Explanation:</u>
For the given options:
A solution is defined as the solution in which the components gets completely dissolved in it. Particles are evenly spread in these solutions. They can be separated by physical means.
An element is defined as the substance which is made of similar kind of atoms. All the atoms in an element have same atomic number. The atoms cannot be separated by any physical or chemical means.
Compound is defined as a chemical specie which is made by the combination of different atoms. For Example: etc.. The atoms in a compound can be chemically separated.
A mixture is defined as the substance which is made by mixing two or more substances in any ratio. They can be separated by physical means.
Hence, the substance that cannot be separated physically or chemically is an element.
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Half-life is the time taken for the concentration of the substance to reduce by 50%. The original sample of strontium had a mass of 1.6 gms. Thus, option d is correct.
<h3>What is half-life?</h3>The half-life of any radioactive substance is the time period at which the concentration will get reduced to half the initial amount. The initial mass of Sr-90 is calculated as,
Given,
Quantity of the remaining substance N (t) = 0.40 gm
Initial radioactive substance quantity =?
Time duration (t) = 56 years
Half-life = 28 years
Substituting values above:
= 1.6 gm
Therefore, option d. the initial mass of Sr is 1.6 gm.
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