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spencer stack

science 6 for atom test

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.
Created by: turtle 6331