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Polyatomic Ions Flashcards

Memorize Table 2.5 for Test 1

1
Q

Polyatomic ions

A
  • Ions that are themselves composed of two or more atoms linked by the same covalent bonds that hold molecules together… but they have a charge.
  • Trick to identify the charge: If the total of the group numbers of the atoms is odd, it will have a charge of 1-. (Except for phosphate, -3.) If the total is even, it will have a charge of 2-.
  • -ate has one more Oxygen than -ite.
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2
Q

NH4 +

A

ammonium

(Note that the only positive common polyatomic ions are this, and hydronium H3O+.

Note that ammonium is different from the compound ammonia, NH3.)

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3
Q

H3O +

A

hydronium (always in aqueous solutions)

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4
Q

CN -

A

cyanide

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5
Q

OH -

A

hydroxide

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6
Q

NO2 -

A

nitrite

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7
Q

NO3 -

A

Nitrate

(Hint: Nina, 3 girls. Nitrite is NO2-.)

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8
Q

ClO -

or OCl -

A

Hypochlorite

(Order: hypochlorite, chlorite, chlorate, perchlorate)

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9
Q

ClO2 -

A

Chlorite

(Order: hypochlorite, chlorite, chlorate, perchlorate)

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10
Q

ClO3 -

A

Chlorate

(Order: hypochlorite, chlorite, chlorate, perchlorate)

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11
Q

ClO<span>4</span> -

A

perchlorate

(Order: hypochlorite, chlorite, chlorate, perchlorate)

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12
Q

MnO4 -

A

permanganate

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13
Q

C2H3O2 -

A

acetate

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14
Q

C2O4 2-

A

oxalate

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15
Q

CO3 2-

A

carbonate

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16
Q

HCO3 -

A

hydrogen carbonate

aka bicarbonate ion

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17
Q

SO3 2-

A

sulfite

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18
Q

HSO3 -

A

hydrogen sulfite

aka bisulfite

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19
Q

SO4 2-

A

sulfate

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20
Q

HSO4 -

A

hydrogen sulfate

aka bisulfate

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21
Q

SCN -

A

thiocyanate

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22
Q

S2O3 2-

A

thiosulfate

(Hint: Two weird sulfur. Thiree-O’s.)

23
Q

CrO4 2-

A

chromate

(dichromate is Cr2O72-)

24
Q

Cr2O7 2-

A

dichromate

(just chromate is CrO4<span> </span>2-)

25
Q

PO4 3-

26
Q

HPO4 2-

A

monohydrogen phosphate

(meanwhile dihydrogen phosphate just has another H: H2PO4-)

27
Q

H2PO4-

A

dihydrogen phosphate

(one more hydrogen than hydrogen phosphate HPO4 2-)

28
Q

What is the formula for this polyatomic ion?

ammonium

29
Q

What is the formula for this polyatomic ion?

hydronium (always in aqueous solutions)

30
Q

What is the formula for this polyatomic ion?

cyanide

31
Q

What is the formula for this polyatomic ion?

hydroxide

32
Q

What is the formula for this polyatomic ion?

nitrite

33
Q

What is the formula for this polyatomic ion?

Nitrate

34
Q

What is the formula for this polyatomic ion?

Hypochlorite

(Order: hypochlorite, chlorite, chlorate, perchlorate)

A

ClO -

or OCl -

35
Q

What is the formula for this polyatomic ion?

Chlorite

(Order: hypochlorite, chlorite, chlorate, perchlorate)

36
Q

What is the formula for this polyatomic ion?

Chlorate

(Order: hypochlorite, chlorite, chlorate, perchlorate)

37
Q

What is the formula for this polyatomic ion?

perchlorate

(Order: hypochlorite, chlorite, chlorate, perchlorate)

A

ClO<span>4</span> -

38
Q

What is the formula for this polyatomic ion?

permanganate

39
Q

What is the formula for this polyatomic ion?

acetate

A

C2H3O2 -

Pam writes this as CH3COO

(Either works.)

40
Q

What is the formula for this polyatomic ion?

oxalate

41
Q

What is the formula for this polyatomic ion?

carbonate

42
Q

What is the formula for this polyatomic ion?

hydrogen carbonate

aka bicarbonate ion

43
Q

What is the formula for this polyatomic ion?

sulfite

44
Q

What is the formula for this polyatomic ion?

hydrogen sulfite

aka bisulfite

45
Q

What is the formula for this polyatomic ion?

sulfate

46
Q

What is the formula for this polyatomic ion?

hydrogen sulfate

aka bisulfate

47
Q

What is the formula for this polyatomic ion?

thiocyanate

48
Q

What is the formula for this polyatomic ion?

thiosulfate

A

S2O3 2-

(Hint: Two weird, thio-three O.)

49
Q

What is the formula for this polyatomic ion?

chromate

50
Q

What is the formula for this polyatomic ion?

dichromate

51
Q

What is the formula for this polyatomic ion?

phosphate

52
Q

What is the formula for this polyatomic ion?

monohydrogen phosphate

53
Q

What is the formula for this polyatomic ion?

dihydrogen phosphate

zz Gen Chem 1 (15 decks)

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