What is produced when an acid reacts with a metal?

A. Salt and water

B. Carbon dioxide and water

C. Oxygen gas and water

D. Salt and hydrogen

Answer Explanation:

A) Salt and water: This reaction occurs when an acid reacts with a metal hydroxide or a metal oxide. When metals react with acids, hydrogen gas is typically produced along with a salt, not water.

B) Carbon dioxide and water: This reaction occurs when an acid reacts with a metal carbonate, not a metal. When carbonates react with acids, carbon dioxide gas is produced along with water and a salt.

C) Oxygen gas and water: This reaction is not typical when an acid reacts with a metal. Metal reactions with acids usually produce hydrogen gas along with a salt.

D) Salt and hydrogen (Correct Answer): When an acid reacts with a metal, hydrogen gas is produced along with a salt. The metal displaces hydrogen ions from the acid, forming a salt, while hydrogen gas is released as a byproduct of the reaction.

Therefore, the Correct Answer is D.

Q #1: What type of reaction occurs between sulfuric acid and ammonia?

A. Oxidation

B. Reduction

C. Neutralization

D. Precipitation

Answer Explanation

A) Oxidation: Sulfuric acid and ammonia do not participate in an oxidation-reduction reaction, where one substance loses electrons (oxidation) and another gains electrons (reduction).

B) Reduction: Sulfuric acid and ammonia do not participate in an oxidation-reduction reaction, so reduction is not the correct type of reaction.

C) Neutralization (Correct Answer): When sulfuric acid reacts with ammonia, a neutralization reaction occurs. The acidic hydrogen ions (H+) from sulfuric acid react with the basic ammonia molecules (NH3) to form ammonium ions (NH4+) and sulfate ions (SO4^2-), resulting in the formation of an ammonium sulfate salt.

D) Precipitation: A precipitation reaction occurs when two solutions react to form an insoluble solid (precipitate). However, sulfuric acid and ammonia do not form an insoluble product when they react. Therefore, precipitation is not the correct type of reaction for this scenario.
Q #2: Which statement regarding metal and non-metal oxides is not true?

A. Metal oxides are bases and forms alkalis in water.

B. Non-metal oxides form acids in water.

C. Solutions of non-metal oxides change red litmus blue.

D. Metal oxides color universal indicator blue and non-metal oxides color it red.

Answer Explanation

A. Metal oxides are bases and form alkalis in water: This statement is generally true. Metal oxides typically react with water to form basic solutions (alkalis). Therefore, this statement is true.

B. Non-metal oxides form acids in water: This statement is generally true. Non-metal oxides typically react with water to form acidic solutions. Therefore, this statement is true.

C. Solutions of non-metal oxides change red litmus blue: This statement is not true. Non-metal oxides typically form acidic solutions in water, which would not change red litmus paper to blue. Instead, they would typically turn blue litmus paper red.

D. Metal oxides color universal indicator blue and non-metal oxides color it red: This statement is generally true. Metal oxides tend to produce basic solutions, which turn universal indicator blue. Non-metal oxides tend to produce acidic solutions, which turn universal indicator red. Therefore, this statement is true.
Q #3: Why do farmers use ammonium salts on their fields?

A. To prevent soil erosion

B. To increase soil acidity

C. To help plants grow (as fertilizers)

D. To reduce soil salinity

Answer Explanation

A) To prevent soil erosion: While certain soil management practices may involve measures to prevent erosion, the use of ammonium salts specifically does not directly relate to preventing soil erosion.

B) To increase soil acidity: Ammonium salts, such as ammonium sulfate, can actually decrease soil pH, making the soil more acidic. However, this is not typically the primary reason farmers use these salts.

C) To help plants grow (as fertilizers) (Correct Answer): Ammonium salts are commonly used as fertilizers because they provide essential nitrogen to plants in a form that they can readily absorb. Nitrogen is a crucial nutrient for plant growth, and ammonium salts serve as a source of nitrogen for crops.

D) To reduce soil salinity: Ammonium salts are not typically used to reduce soil salinity. Salinity issues in soil are typically addressed through other methods such as leaching or soil amendments, rather than the addition of ammonium salts.

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What is produced when an acid reacts with a metal?

More Questions on TEAS 7 Science

Q #1: What type of reaction occurs between sulfuric acid and ammonia?

Answer Explanation

Q #2: Which statement regarding metal and non-metal oxides is not true?

Answer Explanation

Q #3: Why do farmers use ammonium salts on their fields?

Answer Explanation

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