ATI TEAS 7
Chemistry
1. In the reaction 4Al + 3O2 → 2Al2O3, what is the mole ratio of aluminum to oxygen?
- A. 4:3
- B. 2:3
- C. 3:2
- D. 3:4
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?
- A. Momentum doubles
- B. Momentum halves
- C. Momentum quadruples
- D. Momentum remains the same
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."
- A. comma after "children"
- B. comma after "play"
- C. period after "outside"
- D. no errors
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?
- A. The number of protons in an atom's nucleus.
- B. The number of neutrons in an atom's nucleus.
- C. The number of electrons in an atom's valence shell.
- D. The number of isotopes 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?
- A. Change in wavelength
- B. Change in frequency
- C. Change in wave speed
- D. None of the above
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:
- A. A smaller force
- B. An equal force
- C. A greater force
- D. No force at all
Correct answer: b
Rationale: Newton's third law states that for every action, there is an equal and opposite reaction.
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