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| 1 | |
Cells are formed from molecules. These molecules are formed when _______ join(s) together. |
| | A) | water |
| | B) | protons |
| | C) | elements |
| | D) | atoms |
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| 2 | |
Why do atoms give up, accept, or share electrons to form bonds? |
| | A) | Atoms bond in order to become stable |
| | B) | Atoms bond because they are polar |
| | C) | Atoms bond to become radioactive isotopes |
| | D) | Atoms bond because they are nonpolar |
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| 3 | |
Which statement about the properties of water is true? |
| | A) | Water changes temperature easily, its molecules stick together and to nonpolar molecules, it dissolves nonpolar substances, and is denser as a solid than as a liquid. |
| | B) | Water changes temperature slowly, its molecules do not stick together or to other polar substances, it dissolves other polar substances, and is less dense as a solid than as a liquid. |
| | C) | Water changes temperature easily, its molecules stick together and stick to other polar molecules, it dissolves other polar substances, and is less dense as a solid than as a liquid. |
| | D) | Water changes temperature slowly, its molecules stick together, and stick to other polar molecules, it dissolves other polar substances, and is less dense as a solid than as a liquid. |
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| 4 | |
Which is a correct statement regarding the difference between acids and bases? |
| | A) | Bases release excess hydrogen ions (H+) when they dissociate in water. Acids take up H+ or release excess hydroxide ions (OH−). |
| | B) | Acids release excess hydrogen ions (H+) when they dissociate in water. Bases take up H+ or release excess hydroxide ions (OH−). |
| | C) | Acids are strong and bases are weak. |
| | D) | Bases are strong and acids are weak. |
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| 5 | |
Which is a correct statement regarding the pH scale? |
| | A) | The pH scale ranges from 0 to 14. A pH value below 7 is basic and pH value above 7 is acidic. |
| | B) | The pH scale ranges from 1 to 10. A pH value of 4 would indicate an acid, while a pH value of 9 would indicate a base. |
| | C) | The pH scale ranges from 0 to 14. A pH value below 7 is acidic, while a pH value above 7 is basic. |
| | D) | Te pH scale ranges from 0 to 14. A pH value of 0 is neutral, between 1 and 7 is basic, and from 8-14 is acidic. |
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