Ions Polyatomiques

Question 1

What is the chemical formula for formate?

Answer 1

HCOO-

Formate is the anion derived from formic acid.

Question 2

What is the chemical formula for acetate?

Answer 2

C2H3O2-

Acetate is the anion derived from acetic acid.

Question 3

What is the chemical formula for propanoate (or propionate)?

Answer 3

C3H5O2-

Propanoate is the anion derived from propanoic acid.

Question 4

What is the chemical formula for lactate?

Answer 4

C3H5O3-

Lactate is the anion derived from lactic acid.

Question 5

What is the chemical formula for benzoate?

Answer 5

C7H5O2-

Benzoate is the anion derived from benzoic acid.

Question 6

What is the chemical formula for tartrate?

Answer 6

C4H4O6^2-

Tartrate is derived from tartaric acid.

Question 7

What is the chemical formula for oxalate?

Answer 7

C2O4^2-

Oxalate is the anion derived from oxalic acid.

Question 8

What is the central atom in the permanganate ion?

Answer 8

Manganese (Mn)

Permanganate ion has the formula MnO4-.

Question 9

What is the chemical formula for chromate?

Answer 9

CrO4^2-

Chromate is a polyatomic ion containing chromium.

Question 10

What is the chemical formula for dichromate?

Answer 10

Cr2O7^2-

Dichromate contains two chromium atoms.

Question 11

What is the chemical formula for cyanide?

Answer 11

CN-

Cyanide is a highly toxic ion.

Question 12

What is the chemical formula for carbonate?

Answer 12

CO3^2-

Carbonate is a common anion found in many minerals.

Question 13

What is the chemical formula for bicarbonate?

Answer 13

HCO3-

Bicarbonate is also known as hydrogen carbonate.

Question 14

What is the chemical formula for ammonium?

Answer 14

NH4+

Ammonium is a positively charged polyatomic ion.

Question 15

What is the chemical formula for nitrite?

Answer 15

NO2-

Nitrite is derived from nitric acid.

Question 16

What is the chemical formula for nitrate?

Answer 16

NO3-

Nitrate is a common ion in fertilizers.

Question 17

What is the chemical formula for phosphate?

Answer 17

PO4^3-

Phosphate is essential for biological molecules.

Question 18

What is the chemical formula for sulfate?

Answer 18

SO4^2-

Sulfate is found in many minerals and industrial applications.

Question 19

What is the chemical formula for hydroxide?

Answer 19

OH-

Hydroxide is a common base in chemistry.

Question 20

What is the chemical formula for thiocyanate?

Answer 20

SCN-

Thiocyanate is used in various chemical reactions.

Question 21

What is the chemical formula for hypochlorite?

Answer 21

ClO-

Hypochlorite is commonly used as a disinfectant.

Question 22

What is the chemical formula for chlorate?

Answer 22

ClO3-

Chlorate is used in herbicides and explosives.

Question 23

What is the chemical formula for perchlorate?

Answer 23

ClO4-

Perchlorate is a strong oxidizer.

Question 24

Fill in the blank: An _______ is a negatively charged ion.

Answer 24

anion

Anions are formed when atoms gain electrons.

Question 25

Fill in the blank: A _______ is a positively charged ion.

Answer 25

cation ## Footnote Cations are formed when atoms lose electrons.

Question 26

True or False: An allotrope is a different form of the same element.

Answer 26

True ## Footnote Examples include graphite and diamond, which are both forms of carbon.

Question 27

What does amphoteric mean?

Answer 27

Can act as both acid and base ## Footnote Amphoteric substances can react with both acids and bases.

Question 28

What is electronic affinity?

Answer 28

Energy change when an electron is added ## Footnote It is a measure of how much an atom wants to gain an electron.