Term
| The joining of atoms to form a new substance. |
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Definition
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Term
an interaction that holds two atoms together |
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| a bond that forms when electrons are transferred from one atom to another |
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Term
| charged particles that form when atoms gain or lose electrons |
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Definition
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Term
when atoms gain elctrons during chemical changes, what charge do they have? |
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Term
What is a molecule made up of two atoms of the same element? |
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Term
| When ions bond, what is the regular pattern called? |
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Term
What is formed when atoms share one or more electrons? |
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| What consists of two or more atoms joined together? |
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Definition
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Term
What is used to show the valence electrons in an atom? |
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Term
| This means the ability of metal to be drawn into wires. |
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Term
| This means the ability of metal to be hammered into sheets. |
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Term
| This causes metals to be bent, but not broken. |
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Term
| The number of protons in an atom is called |
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Definition
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Term
| On the periodic table, atoms in the same |
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Term
An electron in the outermost level of an atom is a(n) |
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Definition
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Term
| If a sodium atom loses its only valence electron, it becomes a(n) |
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Definition
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Term
| For electrons to pull away from atoms, what is needed? |
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Definition
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Term
When atoms lose electrons in an ionic bond, they become what kind of charge? |
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Term
This describes chlorophyll breaking down into new substances. |
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Definition
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Term
What is true of the new substances formed in a chemical reaction? |
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Definition
properties differ from original substances |
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Term
| Which of these is a sign of a chemical reation? |
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Definition
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Term
| How can you be sure a chemical reaction is happening? |
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Definition
a new substance is formed |
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Term
| This is an example of a diatomic molecule. |
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Definition
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Term
| When chemical bonds break, what do atoms do? |
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Definition
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Term
What does a prefix in a chemical formula tell you about an element? |
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Definition
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Term
What happens to atoms in a chemical reaction? |
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Definition
never lost or gained, just rearranged |
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Term
What must be done for a chemical equation to be balanced? |
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Definition
all atoms must be counted |
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Term
What usually increases the rate of a reaction? |
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Definition
grinding a solid reactant into powder |
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Term
This shows a exothermic reaction. |
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Definition
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Term
| What happens in an endothermic reaction? |
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Definition
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Term
Name the parts of this formula:
2C + 2O 2CO |
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Definition
A. coefficient
B. reactants
C. subscript
D. product
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Term
When an element replaces another element |
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Definition
single-displacement reaction |
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Term
Ions from two compounds exchange places |
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Definition
double-displacement reaction |
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Term
| Two substances combine forming a new compound. |
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Definition
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A substance breaks down into new substances. |
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Definition
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Term
The force that holds two atoms together |
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Definition
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Term
When these bump into one another with enough energy, chemical bonds break. |
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Definition
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Term
When chemical bonds break, the atoms rearrange to form new |
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Definition
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Term
A molecule made up of two atoms |
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Definition
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