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Novosadov [1.4K]
3 years ago
11

Which of the following are considered pure substances?

Chemistry
2 answers:
Tanzania [10]3 years ago
8 0

Element. Everything is else is a mixture, therefore not pure.

Ganezh [65]3 years ago
3 0

Answer: A. Element and B. Compound

Explanation:

Element is a pure substance which is composed of atoms of similar elements.It can not be decomposed into simpler constituents using chemical reactions.Example: Copper Cu

Compound is a pure substance which is made from atoms of different elements combined together in a fixed ratio by mass.It can be decomposed into simpler constituents using chemical reactions. Example: water H_2O

Heterogeneous mixture : It is a mixture that has non-uniform composition throughout the solution and the particle size or shapes are also different.There is a physical boundary between the dispersed phase and dispersion medium.

Homogeneous mixture:  It is a mixture that has uniform composition throughout the solution and the particle size or shapes are not different.There is no physical boundary between the dispersed phase and dispersion medium.

Thus element and compound are pure substances.

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Alla [95]

You can easily find hundreds on the internet.

4 0
3 years ago
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When 100ml of M HCl is mixed with 100ml of N NaOH, the pH of the resulting solution is
RoseWind [281]

Answer:

Option d. 7

Explanation:

A mixture of a strong base and a strong acid produce a neutral salt and water.

This is the reaction of neutralization:

HCl + NaOH → NaCl + H₂O

NaCl →  Na⁺  +  Cl⁻

Sodium chloride is neutral salt which does not give H⁻ neither OH⁻ to medium, that's why pH is neutral.

Both ions are derivated from a strong acid and base so they do not make hydrolisis. They are a conjugate pair of a weak acid and base. The reactions can not occur:

Cl⁻  +  H₂O ← OH⁻  +  HCl

Na⁺  +  H₃O⁺ ← NaOH  + H₂O

4 0
3 years ago
Routs<br> Which of the following is a physical change?
kotykmax [81]

Answer:

Explanation:

A physical change is a change in which the physical properties of matter are altered. These are properties are the forms and state.

Most physical changes are easily reversible and are pure state changes.

They  do not lead to the production of new compounds.

They involve no mass change and requires little to no energy.

Examples are melting, boiling, freezing, sublimation e.t.c

5 0
3 years ago
Which element has a smaller ionic radius than magnesium (Mg)?
barxatty [35]

Answer:

Na has atomic number 11

which is less than magnesium has atomic number 12

ANSWER IS D

Explanation:

aluminum or Al is atomic 13 and Ca or calcium is atomic number 20 and rubidium or Rb is atomic number 37

6 0
3 years ago
I. Choose the letter of the correct answer. Write your answer on a separate sheet of paper.
omeli [17]

Answer:

,,,

Explanation:

..

6 0
2 years ago
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