The neutral atoms of all of the Isotopes of the same element have: a) different

Question

The neutral atoms of all of the Isotopes of the same element have: a) different numbers of protons. b) equal numbers of neutrons. c) the same number of electrons. d) the same mass numbers. e) the same masses. The density of ethylene glycol is 1.11 g/ml. The density of mercury is 13.5 g/mL. What volume of mercury has the same mass as 125 mL ethylene glycol? a) 10.3 mL b) 8.34 mL c) 0.120 mL d) 0.971 mL e) 1870 mL Which is true about elemental potassium? a) It is a nonmetal. b) It is a Group II element. c) It is a liquid at room temperature. d) It is very unreactive. e) It is soft ductile and malleable.

Explanation / Answer

Q35

neutral atoms of isotopes must have = same proton count (since they are the SAME element) and same electron count, sine it is neutral

so:

a) false, sateate above

b) false, they are isotopes

c) true, since they are "neutral"

d) false, since neutrons change

e) flase, they will NOT have same mass

choose D

Q36

D = mass/V so

mass of EG = D*V = 1.11*125 = 138.75g of EG

mass of EG = mass of Hg

138.75 g of HG

V = mass/D = 138.75/(13.5) = 10.277 mL of Hg

choose A

Q37

a) false, it is a metal

b) false, it is a group 1 element

c) false, it is not liquid

d) false, it is very reactive

e) true, since it is a metal

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