Term
| A negative ion is called a(n) _____________. |
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Definition
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Term
| When atoms form cations, they (gain/lose) electrons. |
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Definition
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Term
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Definition
| The octet rule states that atoms will gain or lose electrons so that they achieve a filled outer level of electrons. This is most often 8 electrons; hence the name octet rule. |
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Term
| What is the charge of the cation chromium(VI)? |
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Definition
+6.
The Roman numeral indicates the charge. |
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Term
Which formula is correct for the compound
copper(II) chloride?
A. Cu2Cl
B. CuCl2 |
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Definition
B is correct: CuCl2.
The Roman numeral does not indicate the number of copper ions. It indicates the charge of the copper ion. Since Cl has a -1 charge, you need two Cl- ions to balance
one Cu+2 ion. |
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Term
| Write the formula (don't forget the charge) of the polyatomic ion sulfate. |
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Definition
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Term
A common positive polyatomic ion is named ammonium.
Write its formula (don't forget the charge!) |
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Definition
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Term
Write the formula of the ionic compound
potassium nitrate. |
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Definition
KNO3
No parentheses around the nitrate anion. Only use parentheses when the formula requires more than one polyatomic ion. |
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Term
Write the formula of the ionic compound
ammonium oxide. |
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Definition
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Term
Write the formula of the ionic compound
iron(III) hydroxide. |
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Definition
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Term
Write the formula of the ionic compound
lead(IV) carbonate. |
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Definition
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Term
How many hydrogen atoms are in the compound
aluminum tartrate? |
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Definition
aluminum tartrate is Al2(C4H4O6)3.
There are 4 x 3 = 12 hydrogen atoms. |
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Term
| Write the formula for the compound lithium phosphate. |
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Definition
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Term
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Definition
Cobalt(II) fluoride.
Cobalt is one of those elements that requires a Roman numeral in its name. Check the back of your PT! |
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Term
| Name this compound: Ba(NO2)2 |
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Definition
Barium nitrite.
(How do you know that barium does not require a Roman numeral?) |
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Term
One polyatomic not on your list is called permanganate.
A correct ionic formula containing this ion is Sr(MnO4)2. Based on this formula, what is the charge of the permanganate ion? |
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Definition
| -1 charge, since Sr has a +2 charge and there are two permanganate ions for one strontium ion. |
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Term
| Name this compound: NH4Br |
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Definition
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Term
What is incorrect about this ionic formula?
(Mg)Cl2 |
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Definition
The ratio of ions is correct...what is wrong is the parentheses around the magnesium ion. Only use ( ) around polyatomic ions, and only when there is more than one polyatomic.
The correct formula is MgCl2. |
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Term
What is incorrect about this ionic formula?
Ca(SO4). |
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Definition
The ratio of ions is correct...what is wrong is the parentheses around the sulfate ion. Only use ( ) around polyatomic ions when there is more than one of those ions in the formula.
The correct formula is CaSO4. |
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Term
| Write the formula for iron(III) bicarbonate. |
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Definition
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Term
| Name this compound: Cu2SO3. |
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Definition
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Term
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Definition
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Term
What is wrong with this formula: SCa.
Also name this correctly-written compound. |
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Definition
| The positive ion is always written first. The correct formula is CaS. Calcium sulfide. |
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Term
| Write the formula for silver acetate. |
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Definition
AgC2H3O2.
No parentheses! |
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