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1 | |
A formula for a compound is given as KCl. This is a (an) |
| | A) | empirical formula. |
| | B) | molecular formula. |
| | C) | structural formula. |
| | D) | formula, but type unknown without further information. |
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2 | |
A formula for a compound is given as C8H18. This is a (an) |
| | A) | empirical formula. |
| | B) | molecular formula. |
| | C) | structural formula. |
| | D) | formula, but type unknown without further information. |
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3 | |
The formula weight of sulfuric acid, H2SO4, is |
| | A) | 49 u. |
| | B) | 50 u. |
| | C) | 98 u. |
| | D) | 194 u. |
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4 | |
A balanced chemical equation has |
| | A) | the same number of molecules on both sides of the equation. |
| | B) | the same kinds of molecules on both sides of the equation. |
| | C) | the same number of each kind of atom on both sides of the equation. |
| | D) | all of the above. |
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5 | |
The law of conservation of mass means that |
| | A) | atoms are not lost or destroyed in a chemical reaction. |
| | B) | the mass of a newly formed compound cannot be changed. |
| | C) | in burning, part of the mass must be converted into fire in order for mass to be conserved. |
| | D) | molecules cannot be broken apart because this would result in less mass. |
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6 | |
A chemical equation is balanced by changing (the) |
| | A) | subscripts. |
| | B) | superscripts. |
| | C) | coefficients. |
| | D) | any of the above as necessary to achieve a balance. |
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7 | |
Since wood is composed of carbohydrates, you should expect what gases to exhaust from a fireplace when complete combustion takes place? |
| | A) | carbon dioxide, carbon monoxide, and pollutants |
| | B) | carbon dioxide and water vapor |
| | C) | carbon monoxide and smoke |
| | D) | It depends on the type of wood being burned. |
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8 | |
When carbon burns with an insufficient supply of oxygen, carbon monoxide is formed according to the following equation: 2 C + O2 → 2 CO. What category of chemical reaction is this? |
| | A) | combination |
| | B) | ion exchange |
| | C) | replacement |
| | D) | None of the above, because the reaction is incomplete. |
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9 | |
According to the activity series for metals, adding metallic iron to a solution of aluminum chloride should result in |
| | A) | a solution of iron chloride and metallic aluminum. |
| | B) | a mixed solution of iron and aluminum chloride. |
| | C) | the formation of iron hydroxide with hydrogen given off. |
| | D) | no metal replacement reaction. |
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10 | |
In a replacement reaction, elements that have the most ability to hold onto their electrons are |
| | A) | the most chemically active. |
| | B) | the least chemically active. |
| | C) | not generally involved in replacement reactions. |
| | D) | none of the above. |
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11 | |
Of the following elements, the one with the greatest electronholding ability is |
| | A) | sodium. |
| | B) | zinc. |
| | C) | copper. |
| | D) | platinum. |
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12 | |
Of the following elements, the one with the greatest chemical activity is |
| | A) | aluminum. |
| | B) | zinc. |
| | C) | iron. |
| | D) | mercury. |
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13 | |
You know that an expected ion exchange reaction has taken place if the products include |
| | A) | a precipitate. |
| | B) | a gas. |
| | C) | water. |
| | D) | any of the above. |
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14 | |
The incomplete equation of 2 KClO3(s)Δ→ probably represents which type of chemical reaction? |
| | A) | combination |
| | B) | decomposition |
| | C) | replacement |
| | D) | ion exchange |
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15 | |
In the equation of 2 H2 (g) + O2 (g) → 2 H2O(g), |
| | A) | the total mass of the gaseous reactants is less than the total mass of the liquid product. |
| | B) | the total number of molecules in the reactants is equal to the total number of molecules in the products. |
| | C) | one volume of oxygen combines with two volumes of hydrogen to produce two volumes of water. |
| | D) | All of the above are correct. |
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16 | |
An amount of a substance that contains Avogadro's number of atoms, ions, or molecules is (a) |
| | A) | mole. |
| | B) | gram-atomic weight. |
| | C) | gram-formula weight. |
| | D) | any of the above. |
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17 | |
If you have 6.02 x 1023 atoms of metallic iron, you will have how many grams of iron? |
| | A) | 26 |
| | B) | 55.8 |
| | C) | 334.8 |
| | D) | 3.4 x 1025 |
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