General Chemistry - Standalone book (MindTap Course List)
11th Edition
ISBN:9781305580343
Author:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell
Publisher:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell
Chapter2: Atoms, Molescules, And Ions
Section: Chapter Questions
Problem 2.55QP: While traveling to a distant universe, you discover the hypothetical element X. You obtain a...
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Question
Transcribed Image Text:O How many neutrons are in carbon-12 ?
A) 7
B) 8
C) 6
O Identify the chalcogen that has 18 neutrons in the nucleus.
A) sulfur-32
B) sulfur-34
C) sulfur-33
) What's the mass number of carbon-14 ?
В) 8
A) 6
C) 14
) What's the atomic number of sulfur-34 ?
A) 34
B) 18
C) 16
) In the formula of hydroxylapatite Ca,o(PO4)6(OH)2 determine the number of each kind of atom, Ca, O, H, P:
A) Са — 10; О -8;B Н — 2; Р - 6
с) Са — 10; О — 12;B Н — 2;B Р - 6
B) Ca – 10; O – 26; H – 2; P - 6
D) Ca – 10; O – 26; H – 2; P - 1
) Which element is represented by the chemical symbol TI ?
A) tantalum
B) thorium
C) thallium
) The fact that water is 11.2 % hydroen and 88.8 % oxygen by mass regardless of its origin is an example of
A) Dalton's atomic theory
B) law of conservation of mass
C) law of definite proportions
) Write the empirical formulas for the following compound:
A) C,H¿O2
B) CH,O
C) C2H,0
) Write a sentence that describes how to determine the number of moles of a compound in a known mass of the
compound if we know its molecular formula.
A) Use the molecular formula to find the molar mass; to obtain the number of moles, divide the molar mass
of the compound by the mass of compound.
B) Use the molecular formula to find the molar mass; to obtain the number of moles, divide the mass of
compound
C) Use the molecular formula to find the molar mass; to obtain the number of moles, multiply the mass of
the molar mass of the compound.
compound with the molar mass of the compound.
) Compare 1 mole of H 1 mole of O, and 1 mole of F, Which has the largest number of molecules? Which has
the greatest mass?
A) All three have the same number of molecules, since a mole is defined as a specific number of particles.
B) O2 has the largest number of molecules.
C) H2 has the largest number of molecules.
) Calculate the molar mass of the following compound: hydrogen fluoride, HF
A) 1.01 g/mol
B) 19.00 g/mol
C) 20.01 g/mol
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