If xenon has an atomic number of 54 and a mass number of 108 PDF

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If xenon has an atomic number of 54 and a mass number of 108, how many neutrons does it have? Select one: a. 54

b. 27 c. 100 d. 108 Feedback The correct answer is: 54

Question 2 Correct Mark 1.00 out of 1.00

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Atoms that vary in the number of neutrons found in their nuclei are called __________. Select one: a. ions b. neutrons c. neutral atoms d. isotopes

Feedback The correct answer is: isotopes

Question 3 Correct Mark 1.00 out of 1.00

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Potassium has an atomic number of 19. What is its electron configuration? Select one: a. shells 1 and 2 are full, and shell 3 has nine electrons b. shells 1, 2 and 3 are full and shell 4 has three electrons c. shells 1, 2 and 3 are full and shell 4 has one electron

d. shells 1, 2 and 3 are full and no other electrons are present Feedback The correct answer is: shells 1, 2 and 3 are full and shell 4 has one electron

Question 4 Correct Mark 1.00 out of 1.00

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Which type of bond represents a weak chemical bond? Select one: a. hydrogen bond

b. atomic bond c. covalent bond d. nonpolar covalent bond Feedback The correct answer is: hydrogen bond

Question 5 Correct Mark 1.00 out of 1.00

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Which of the following statements is not true? Select one:

a. Water is polar. b. Water stabilizes temperature. c. Water is essential for life. d. Water is the most abundant molecule in the Earth’s atmosphere.

Feedback The correct answer is: Water is the most abundant molecule in the Earth’s atmosphere.

Question 6 Correct Mark 1.00 out of 1.00

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When acids are added to a solution, the pH should __________. Select one: a. decrease

b. increase c. stay the same d. cannot tell without testing Feedback The correct answer is: decrease

Question 7 Incorrect Mark 0.00 out of 1.00

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A molecule that binds up excess hydrogen ions in a solution is called a(n) __________. Select one:

a. acid

b. isotope c. base d. donator Feedback The correct answer is: base

Question 8 Correct Mark 1.00 out of 1.00

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Which of the following statements is true? Select one: a. Acids and bases cannot mix together. b. Acids and bases will neutralize each other.

c. Acids, but not bases, can change the pH of a solution. d. Acids donate hydroxide ions (OH–); bases donate hydrogen ions (H+). Feedback The correct answer is: Acids and bases will neutralize each other.

Question 9 Correct Mark 1.00 out of 1.00

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Each carbon molecule can bond with as many as __________ other atom(s) or molecule(s). Select one: a. one

b. two c. six d. four

Feedback The correct answer is: four

Question 10 Correct Mark 1.00 out of 1.00

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Which of the following is not a functional group that can bond with carbon? Select one: a. sodium

b. hydroxyl c. phosphate d. carbonyl Feedback The correct answer is: sodium...