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| 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 |
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| 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. |
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| 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. |
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| 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 |
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| 5 | |
Isotopes of an element differ in their |
| | A) | chemical symbol |
| | B) | atomic number |
| | C) | mass number |
| | D) | chemical reactivity |
| | E) | number of protons |
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| 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 |
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| 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 |
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| 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 |
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| 9 | |
Which of the following has the most metallic character? |
| | A) | Ge |
| | B) | In |
| | C) | O |
| | D) | P |
| | E) | Sb |
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| 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+ |
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| 11 | |
The empirical formula for naphthalene, C10H8 is |
| | A) | CH |
| | B) | C10H8 |
| | C) | C15H12 |
| | D) | C5H4 |
| | E) | C20H16 |
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| 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 |
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| 13 | |
The compound P4S10 is named _______ phosphorus ______ sulfide. |
| | A) | quadra, septa |
| | B) | tetra, deca |
| | C) | tetra, septa |
| | D) | quadra, deca |
| | E) | di, penta |
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| 14 | |
Which of the following ions has an incorrect charge? |
| | A) | N3- |
| | B) | Al3+ |
| | C) | S2- |
| | D) | Cl- |
| | E) | Mg2- |
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| 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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