Interactive Quiz 1

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Question 1

Methane is a compound which is 75% carbon, by mass, the balance being hydrogen. If a sample of methane weighs 24 g, what mass of hydrogen does it contain?
A) 2.0 g
B) 4.0 g
C) 6.0 g
D) 8.0 g
E) 18.0 g

Question 2

Which of the following ideas was not part of Dalton's atomic theory postulates?
A) Matter consists of atoms which are indestructible.
B) Atoms of an element are identical in all respects.
C) Compounds consist of atoms of different elements combined in specific ratios.
D) Atoms of one element cannot be converted into those of another element.
E) Atoms combine to form small groups called molecules.

Question 3

J.J. Thomson
A) discovered the nucleus.
B) measured the charge of the electron.
C) discovered X-Rays.
D) measured the charge/mass ratio of the electron.
E) invented the cathode ray tube.

Question 4

How many protons (p), neutrons (n) and electrons (e) are there, respectively, in an atom of the chlorine-39 isotope?
A) 17 p, 17 n, 22 e
B) 39 p, 38 n, 39 e
C) 22 p, 17 n, 17 e
D) 17 p, 39 n, 17 e
E) 17 p, 22 n, 17 e

Question 5

Isotopes of an element differ in their
A) chemical symbol
B) atomic number
C) mass number
D) chemical reactivity
E) number of protons

Question 6

How many protons and electrons are present in a Ca2+ ion?
A) 18 protons, 20 electrons
B) 20 protons, 18 electrons
C) 20 protons, 21 electrons
D) 20 protons, 19 electrons
E) 22 protons, 20 electrons

Question 7

Magnesium consists of three isotopes with the following abundances and atomic masses:
24Mg 78.70% 23.985 amu
25Mg 10.13% 24.986
26Mg 11.17% 25.983
Based on these data the atomic weight of magnesium is
A) 24.99
B) 24.53
C) 24.31
D) 23.99
E) none of the above

Question 8

The elements in a row of the periodic table are known as
A) a transition
B) a set
C) a group
D) a subset
E) a period

Question 9

Which of the following has the most metallic character?
A) Ge
B) In
C) O
D) P
E) Sb

Question 10

Elements in Group 6A (16) on the periodic table are most likely to form ________ with a charge of ______ .
A) anions, 2-
B) anions, 2+
C) cations, 2+
D) cations, 2-
E) cations, 6+

Question 11

The empirical formula for naphthalene, C10H8 is
A) CH
B) C10H8
C) C15H12
D) C5H4
E) C20H16

Question 12

The correct name for CuSO4·5H2O is
A) cuprous sulfate pentahydrate
B) copper(I) sulfate pentahydrate
C) cuprous sulfate tetrahydrate
D) copper(II) sulfate tetrahydrate
E) copper(II) sulfate pentahydrate

Question 13

The compound P4S10 is named _______ phosphorus ______ sulfide.
A) quadra, septa
B) tetra, deca
C) tetra, septa
D) quadra, deca
E) di, penta

Question 14

Which of the following ions has an incorrect charge?
A) N3-
B) Al3+
C) S2-
D) Cl-
E) Mg2-

Question 15

What is the formula weight for Fe4[Fe(CN)6]3?
A) 635.91
B) 859.31
C) 435.37
D) 491.22
E) 747.61




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