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ATI TEAS 7

Chemistry

1. In the reaction 4Al + 3O2 → 2Al2O3, what is the mole ratio of aluminum to oxygen?

Correct answer: a

Rationale: The coefficients in the balanced equation represent the mole ratio, which is 4 moles of Al to 3 moles of O2.

2. If the mass of an object remains constant and its velocity doubles, how does its momentum change?

Correct answer: a

Rationale: Momentum is directly proportional to velocity when mass is constant.

3. Identify the incorrect usage of punctuation in the following sentence: "The children, eager to play, ran outside. It was a beautiful day."

Correct answer: C

Rationale: The two sentences are independent clauses and should be separated by a semicolon or period, not a comma.

4. What is the mass number of an element?

Correct answer: B

Rationale: The mass number of an element is the total number of protons and neutrons in the nucleus of an atom. It is represented by the symbol A and is written as a superscript to the element's symbol. For example, the mass number of carbon-12 is 12, which means that a carbon-12 atom has 6 protons and 6 neutrons in its nucleus.

5. What is the principle behind the phenomenon of refraction, where waves bend when entering a new medium?

Correct answer: C

Rationale: Refraction occurs because of the change in wave speed as it enters a new medium, causing the wavefront to bend and change direction.

6. According to Newton's third law of motion, if you push against a wall with a certain force, the wall will push back with:

Correct answer: b

Rationale: Newton's third law states that for every action, there is an equal and opposite reaction.

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