Acids, Bases, & Salts

Which statements are properties of an acid?

1 reacts with ammonium sulfate to form ammonia

2 turns red litmus blue

• A 1. Yes; 2. Yes

• B 1. Yes; 2. No

• C 1. No; 2. Yes

• D 1. No; 2. No

Tags

NGSS.HS-PS1-1

Which property is not characteristic of a base?

• A It reacts with a carbonate to form carbon dioxide.

• B It reacts with an acid to form a salt.

• C It reacts with an ammonium salt to form ammonia.

• D It turns universal indicator paper blue.

A sting from insect X has a pH of 6 and a sting from insect Y has a pH of 8. The table shows the pH of four substances.

Which substances are used to treat the two stings?

• A X = hydrochloric acid; Y = sodium hydroxide

• B X = sodium hydrogen carbonate; Y = vinegar

• C X = sodium hydroxide; Y = hydrochloric acid

• D X = vinegar ; Y = sodium hydrogen carbonate

Tags

NGSS.MS-PS1-2

Three liquids, P, Q and R, are added to a mixture of hydrochloric acid and Universal Indicator solution.

The following observations are made.

P the colour of the indicator turns purple.

Q the colour of the indicator does not change.

R there is effervescence and the indicator turns blue.

What are P, Q and R?

• A P = sodium carbonate solution; Q= water; R = sodium hydroxide solution

• B P = sodium hydroxide solution; Q= water; R = sodium carbonate solution

• C P = water; Q= sodium carbonate solution; R = sodium hydroxide solution

• D P = water ; Q= sodium hydroxide solution ; R = sodium carbonate solution

Tags

NGSS.MS-PS1-2

Which property is NOT characteristic of a base?

• A It reacts with a carbonate to form carbon dioxide.

• B It reacts with an acid to form a salt.

• C It reacts with an ammonium salt to form ammonia.

• D It turns universal indicator paper blue.

The table shows the pH of four aqueous solutions, W, X, Y and Z.

Universal Indicator is added to each solution.

Which row in the second table shows the colour of each solution after the indicator is added?

• A

• B

• C

• D

Tags

NGSS.MS-PS1-2

Hydrochloric acid is used to clean metals. The acid reacts with the oxide layer on the surface of the metal, forming a salt and water.

Which word describes the metal oxide?

• A alloy

• B base

• C element

• D indicator

Tags

NGSS.MS-PS1-1

Which statement is not correct?

• A When a base reacts with an ammonium salt, ammonia is given off.

• B When an acid reacts with a base, neutralisation takes place.

• C When an acid reacts with a carbonate, carbon dioxide is given off.

• D When the acidity of a solution increases, the pH increases.

Which reaction is not characteristic of an acid?

• A It dissolves magnesium oxide.

• B It produces ammonia from ammonium compounds.

• C It produces carbon dioxide from a carbonate.

• D It produces hydrogen from zinc metal.

Which equation for the reaction between sodium carbonate and dilute hydrochloric acid is correct?

• A Na₂CO₃(s) + HCl(aq) → NaCl(aq) + CO₂(g) + H₂O(I)

• B Na₂CO₃(s) + HCl(aq) → Na₂Cl(aq) + CO₂(g) + H₂O(I)

• C Na₂CO₃(s) + 2HCl(aq) → NaCl(aq) + CO₂(g) + H₂O(I)

• D Na₂CO₃(s) + 2HCl(aq) → 2NaCl(aq) + CO₂(g) + H₂O(I)

Tags

NGSS.HS-PS1-7