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| 1 | |
Which of the following statements is true about the reactants and products in a chemical reaction? |
| | A) | The total number of atoms in the molecules of the reactants is more than the total number of atoms in the molecules of the products. |
| | B) | The total mass of the products is more than the total mass of the reactants, because new material is created in the process. |
| | C) | The total mass of the products is less than the total mass of the reactants because mass is lost through the process. |
| | D) | The total number of atoms in the molecules of the reactants is equal to the total number of atoms in the molecules of the products. |
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| 2 | |
What are the three forms of chemical equations? |
| | A) | word equations, skeleton equations, and balanced chemical equations |
| | B) | word equations, reactant equations, and product equations |
| | C) | reactant equations, product equations, and skeleton equations |
| | D) | word equations, balanced chemical equations, and coefficient equations |
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| 3 | |
What do skeleton equations show? |
| | A) | Skeleton equations show the names of the reactants and products associated with the chemical reaction. |
| | B) | Skeleton equations show the composition of each substance in a reaction. |
| | C) | Skeleton equations show the units of reactants that react and the units of products that are produced. |
| | D) | Skeleton equations show how many units of substances are involved in the chemical reaction by using a coefficient in front of a chemical formula. |
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| 4 | |
What does the law of conservation of mass state? |
| | A) | Mass is lost through a chemical reaction. Therefore, the total mass of the reactants is greater than the total mass of the products in a chemical reaction. |
| | B) | Mass is gained through a chemical reaction. Therefore, the total mass of the products is greater than the total mass of the reactants in a chemical reaction. |
| | C) | Mass stays the same through a chemical reaction. Therefore, the total mass of the reactants is equal to the total mass of the products in a chemical reaction. |
| | D) | Mass can be gained or lost through a chemical reaction, depending on which reactants are used. Therefore, the total mass of the products varies, depending on the total mass of the reactants used in a chemical reaction. |
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| 5 | |
N2(g) + 3H2(g) → 2NH3(g) is an example of a(n)… |
| | A) | skeleton equation. |
| | B) | unbalanced equation. |
| | C) | word equation. |
| | D) | balanced equation. |
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| 6 | |
Which statement is true about this equation:
2H2(g) + O2(g) → 2H2O(l)? |
| | A) | The coefficient 2 applies to H2 and O2 on the left side of the equation. |
| | B) | The equation is an example of a skeleton equation. |
| | C) | The equation has not been balanced yet. |
| | D) | The reactants are in a gaseous state; the product is in a liquid state. |
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