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spencer stack
science 6 for atom test
| Question | Answer |
|---|---|
| How is a compound formed? | Formed from two or more elements joined chemically together. |
| What is a chemical change/reaction? | The process in which two or more different types of atoms join together to form a different substance. |
| What is a chemical formula? | The abbrieviation of a compound using symbols or numbers. |
| What is an ion? | An atom that has gained or lost electrons. |
| In a closed shell atom, the outermost shell is completely filled up. | True. |
| A negative ion has gained electrons to fill its outer shell. | True. |
| The subscript 2 in H2O tells us that the molecule has two electrons of hydrogen. | Atoms, not electrons. |
| A negative ion has given away electrons from its outer shell. | Positive ions, not negative ions. |
| Ionic bonding occurs when atoms share electrons. | Covalent bonding, not ionic bonding. |
| Ionic compounds such as salt form crystals. | True. |
| Explain why all compounds are molecules but not all molecules are compounds. | Compounds are formed from two or more elements while molecules are formed from two or more atoms joined together. |
| What does the chemical formula H2CO3 tell you about carbonic acid? | It has 2 hydrogen atoms, 1 carbon atom and 3 oxygen atoms. |
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turtle 6331