Which type of solution is one with a pH of 8?:

A. Acidic

B. Basic

C. Neutral

D. Pure

Answer Explanation:

a. Acidic: Solutions with pH values below 7 are considered acidic. A pH of 8 indicates a solution that is more basic than acidic.

b. Basic (Correct Answer): Solutions with pH values above 7 are considered basic or alkaline. A pH of 8 indicates a basic solution.

c. Neutral: Solutions with a pH of 7 are considered neutral. A pH of 8 indicates a solution that is slightly basic, not neutral.

Therefore, the Correct Answer is B.

Q #1: What is the formula of ammonium sulfate?

A. NH4SO4

B. (NH4)2SO4

C. (NH4)SO4

D. (NH3)2SO4

Answer Explanation

A) NH4SO4: This formula suggests a compound where one ammonium ion is combined with one sulfate ion, which is not the correct composition of ammonium sulfate.

B) (NH4)2SO4 (Correct Answer): This formula correctly represents ammonium sulfate, indicating that it consists of two ammonium ions (NH4+) and one sulfate ion (SO4^2-).

C) (NH4)SO4: This formula suggests a compound with one ammonium ion combined with one sulfate ion, which is not the correct composition of ammonium sulfate.

D) (NH3)2SO4: This formula suggests a compound where two ammonia molecules (NH3) are combined with one sulfate ion, which is incorrect. Ammonium sulfate contains ammonium ions (NH4+), not ammonia molecules (NH3).
Q #2: How would you remove unreacted copper oxide from solution?

A. Filtration

B. Distillation

C. Evaporation

D. Decantation

Answer Explanation

A) Filtration (Correct Answer): Filtration is a commonly used method to separate solid particles, such as unreacted copper oxide, from a liquid solution. The solution containing the dissolved copper sulfate can pass through the filter paper, while the solid copper oxide particles are retained on the filter.

B) Distillation: Distillation is a process used to separate components of a mixture based on differences in their boiling points. It is not typically used to separate solid particles from a liquid solution.

C) Evaporation: Evaporation involves heating the solution to allow the solvent (water) to vaporize, leaving behind the solute (copper sulfate) as solid crystals. While evaporation can concentrate the solution, it does not effectively remove solid particles like unreacted copper oxide.

D) Decantation: Decantation involves pouring off the liquid portion of a mixture, leaving the solid behind. While it can be used to separate solid and liquid phases, it may not effectively separate fine solid particles like unreacted copper oxide from the solution. Filtration would be a more suitable method for this purpose.
Q #3: What is a precipitate?

A. A gas formed during a chemical reaction

B. A liquid formed when two aqueous solutions react

C. A solid formed when two aqueous solutions react

D. A solution formed during a chemical reaction

Answer Explanation

A) A gas formed during a chemical reaction: While gases can indeed be produced during chemical reactions, a precipitate specifically refers to a solid that forms during a reaction.

B) A liquid formed when two aqueous solutions react: Precipitates are not liquids. They are solids that are formed when certain ions combine to form an insoluble compound.

C) A solid formed when two aqueous solutions react (Correct Answer): A precipitate is indeed a solid substance that forms when two aqueous solutions react and certain ions combine to create an insoluble compound.

D) A solution formed during a chemical reaction: A precipitate is not a solution. It is the solid product that separates out of a solution during a chemical reaction due to its limited solubility.

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Which type of solution is one with a pH of 8?:

More Questions on TEAS 7 Science

Q #1: What is the formula of ammonium sulfate?

Answer Explanation

Q #2: How would you remove unreacted copper oxide from solution?

Answer Explanation

Q #3: What is a precipitate?

Answer Explanation

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