which of the following is a common characteristic of alkynes

ATI TEAS 7

TEAS 7 science quizlet

1. Which of the following is a common characteristic of alkynes?

A. They have a triple bond between carbon atoms.
B. They are saturated hydrocarbons.
C. They contain only single bonds.
D. They are aromatic compounds.

Correct answer: A

Rationale: The correct answer is A. Alkynes are hydrocarbons characterized by at least one triple bond between carbon atoms. This triple bond sets them apart from alkanes, which only have single bonds, and alkenes, which feature at least one double bond. The presence of a triple bond makes alkynes unsaturated hydrocarbons. Choice B is incorrect as alkynes are unsaturated hydrocarbons, not saturated. Choice C is incorrect because alkynes contain at least one triple bond, making them different from compounds with only single bonds. Choice D is incorrect because aromatic compounds have a distinct cyclic structure with resonance stabilization, a feature not shared by alkynes.

2. Simplify the expression: 2x + 3x - 5.

A. 5x - 5
B. 5x
C. x - 5
D. 2x - 5

Correct answer: A

Rationale: To simplify the expression 2𝑥 + 3𝑥 - 5, follow these steps: Identify and combine like terms. The terms 2𝑥 and 3𝑥 are both 'like terms' because they both contain the variable 𝑥. Add the coefficients of the like terms: 2𝑥 + 3𝑥 = 5𝑥. Simplify the expression. After combining the like terms, the expression becomes 5𝑥 - 5, which includes the simplified term 5𝑥 and the constant -5. Thus, the fully simplified expression is 5𝑥 - 5, making Option A the correct answer. This method ensures all terms are correctly simplified by combining similar elements and retaining constants.

3. What is the best way to punctuate the dialogue, 'Are you coming?' she asked. 'Maybe,' I replied.

A. 'Are you coming?' she asked? 'Maybe,' I replied.
B. 'Are you coming?' she asked. 'Maybe,' I replied.
C. 'Are you coming?' she asked, 'Maybe,' I replied.
D. 'Are you coming?' she asked, 'Maybe,' I replied.

Correct answer: B

Rationale: The correct way to punctuate dialogue is to enclose each speaker's words in quotation marks. Additionally, the question mark should be placed inside the closing quotation mark of the question. In this case, the correct answer is B as it adheres to the punctuation rules for dialogue. Each character's dialogue is correctly enclosed in quotation marks, and the question mark is appropriately positioned inside the closing quotation mark of the question. Choice A is incorrect as the question mark is placed outside the closing quotation mark of the question. Choice C is incorrect as it uses a comma instead of a period after 'she asked.' Choice D is incorrect as it uses a comma instead of a period after 'she asked' and incorrectly places the comma inside the closing quotation mark of the question.

4. How did Araminta Ross come to be known as Harriet Tubman?

A. She changed her name to her husband's last name and her first name to her mother's name.
B. She was named after the plantation owner's wife.
C. She changed her name because she was wanted as an Underground Railroad runner.
D. She changed her name to remain anonymous as a Civil War spy.

Correct answer: A

Rationale: Araminta Ross came to be known as Harriet Tubman after marrying a free black man named John Tubman. She took her husband's last name 'Tubman' and changed her first name to 'Harriet,' which was her mother's name. This change of name was a personal choice after her marriage and not because she was named after the plantation owner's wife (B), wanted as an Underground Railroad runner (C), or to remain anonymous as a Civil War spy (D). Therefore, the correct answer is A.

5. Where does fertilization, the fusion of sperm and egg, typically occur in the human body?

A. Ovary
B. Uterus
C. Fallopian tube
D. Vagina

Correct answer: C

Rationale: Fertilization typically occurs in the fallopian tube. This is where the sperm and egg meet and fuse to form a zygote. The fallopian tube provides the optimal environment for fertilization as it helps in the transportation of the egg and provides a suitable site for fertilization before the resulting embryo travels to the uterus for implantation. Choices A, B, and D are incorrect. The ovary is where eggs are produced, the uterus is where the fertilized egg implants and develops into a fetus, and the vagina is the canal that leads to the cervix, but fertilization itself does not occur in these locations.