Which of the following determines the strength of an acidic solution?

A. Litmus paper that turns red

B. Litmus paper that turns blue

C. Measured pH value equal to 7

D. Measured pH value less than 7

Answer Explanation:

Both litmus paper and a pH scale can be used to indicate whether a solution is acidic. However, a pH scale can also determine the strength of an acid.

Researchers can determine the strength of an acid or a base by measuring the pH of a solution. The pH value describes how acidic or basic a solution is. On pH scale, shown below, if the number is less than 7 the solution is acidic. A pH greater than 7 means the solution is basic. When the pH is exactly 7, the solution is neutral.

Therefore, the Correct Answer is D.

Q #1: What raw inorganic material would an autotroph most likely use to create chemical energy for growth?

A. carbon dioxide

B. minerals in soil

C. decaying matter

D. sugar molecules

Answer Explanation

Autotrophs are organisms that use basic raw materials in nature, like the sun, to make energy-rich biomolecules. Minerals are naturally inorganic.

Autotrophs are organisms that make energy-rich biomolecules from raw material in nature. They do this by using basic energy sources such the sun. This explains why most autotrophs rely on photosynthesis to transform sunlight into usable food that can produce energy necessary for life. Plants and certain species of bacteria are autotrophs.
Q #2: What structure plays a role in air conduction?

A. Alveolus

B. Capillary

C. Lung

D. Trachea
Answer Explanation

The primary function of the respiratory system is to provide oxygen to and remove carbon dioxide from the body. In addition to gas exchange, the respiratory system enables a person to breathe. Breathing, or inhalation, is essential to life. It is the mechanism that provides oxygen to the body. Without oxygen, cells are unable to perform their functions necessary to keep the body alive. The primary muscle of inspiration is the diaphragm. Known as the chest cavity, this dome shaped structure flattens when it contracts. The rib cage moves outward, allowing outside air to be drawn into the lungs. During relaxation, the diaphragm returns to its dome shape and the rib cage moves back to its natural position. This causes the chest cavity to push air out of the lungs.

The respiratory system can be functionally divided into two parts:
- Air-conducting portion: Air is delivered to the lungs. This region consists of the upper and lower respiratory tract—specifically, the larynx, trachea, bronchi, and bronchioles.
- Gas exchange portion: Gas exchange takes place between the air and the blood. This portion includes the lungs, alveoli, and capillaries.
Q #3: Which is classified as a type of acid-base reaction that produces a salt?

A. Combination

B. Decomposition

C. Hydrolysis

D. Neutralization

Answer Explanation

A neutralization reaction is a type of acid-base reaction where an acid and base react to form a salt and water.

In an aqueous solution, a base increases the hydroxide concentration (OH–), while an acid increases the hydrogen ion (H+) concentration. Sometimes, neutralization reactions also occur. This type of reaction happens when an acid and a base react with each other to form water and salt. Salt is typically defined as an ionic compound that includes any cation except H+ and any anion except OH–. Consider the following example of a neutralization reaction between hydrobromic acid (HBr) and potassium hydroxide (KOH).

HBr+KOH→KBr+H2O

Not all neutralization reactions proceed in the manner where all reactants are in the aqueous phase. In some chemical reactions, one reactant may be a solid. The neutralization reaction can still proceed to completion.

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Which of the following determines the strength of an acidic solution?

More Questions on TEAS 7 Science

Q #1: What raw inorganic material would an autotroph most likely use to create chemical energy for growth?

Answer Explanation

Q #2: What structure plays a role in air conduction?

Answer Explanation

Q #3: Which is classified as a type of acid-base reaction that produces a salt?

Answer Explanation

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