science 6 for atom test
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| How is a compound formed? | Formed from two or more elements joined chemically together.
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| What is a chemical change/reaction? | The process in which two or more different types of atoms join together to form a different substance.
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| What is a chemical formula? | The abbrieviation of a compound using symbols or numbers.
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| What is an ion? | An atom that has gained or lost electrons.
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| In a closed shell atom, the outermost shell is completely filled up. | True.
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| A negative ion has gained electrons to fill its outer shell. | True.
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| The subscript 2 in H2O tells us that the molecule has two electrons of hydrogen. | Atoms, not electrons.
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| A negative ion has given away electrons from its outer shell. | Positive ions, not negative ions.
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| Ionic bonding occurs when atoms share electrons. | Covalent bonding, not ionic bonding.
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| Ionic compounds such as salt form crystals. | True.
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| 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.
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| 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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