Chemistry, 20.10.2019 00:50 rustalex6045

Which of the following observations would indicate that a material is a pure substance?

a. it does not dissolve in water.

b. it changes color after heating.

c. it cannot be physically broken down into different types of atoms.

d. it can be physically broken down into different types of molecules.

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The answer to the question is the option C. it cannot be physically broken down into different types of atoms. This means that the material is an element, which is a pure substance. Because an element is a pure substance that is formed by one only type of atoms. For example, gold is an element and all its atoms are of the same type. That is also true for any of the 118 elements of the periodic table. Compounds (other kind of pure substances) can be broken down into molecules (which contain different kind of atoms, but always in the same proportion) and mixtures (non pure substances) have different kind of substances.

Answer from: xxaurorabluexx

Answer from: Quest

put the answers and i could answer.

Answer from: Quest

The activity series is shown in the attached picture. if the element is below the other, then you can displace the other. following the activity series as a guide, the reactions are as follows: nickel and aluminum chloride3 ni + 2 alcl₃ → 3 nicl₂ + 2 albarium and copper bromideba + cubr → no reaction because cu is less oxidizable than bapotassium nitrate and aluminum3 kno₃ + al → al(no₃)₃ + 3 ksodium phosphate and zincnaso₄ + zn → znso₄ + na

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Which of the following observations would indicate that a material is a pure substance?

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