01 Stoichiometric Relationships

Question 1

Name the SI units for each quantity.

Answer 1

Mass: kg
Temperature: kelvin
Amt. of substance: mole
Meter: distance
Volume: cubic meter
Pressure: pascal

Question 2

How do you convert from dm^3 to m^3?

Answer 2

Divide by 1000.

Question 3

How do you convert from Celsius to Kelvin?

Answer 3

Add 273.15 .

Question 4

What is a precipitation reaction?

Answer 4

Precipitation reactions transform ions into an insoluble salt in aqueous solution.
A precipitation reaction can occur when two solutions containing different salts are mixed, and a CATION/ANION pair results in the product, forming an INSOLUBLE SALT, known as the PRECIPITATE.

Question 5

Define precipitation.

Answer 5

Precipitation refers to a chemical reaction that occurs in AQUEOUS SOLUTION when two ions bond together to form an INSOLUBLE SALT, which is known as the PRECIPITATE.

Question 6

Precipitation reactions can be written in a form known as the COMPLETE IONIC EQUATION (which just shows all the reactants as dissociated ions), like so:

Answer 6

Ag+ (aq) + NO3−(aq) + K+ (aq) + Cl−(aq) → AgCl (s) + K+ (aq) + NO3−(aq)

Question 7

Precipitation reactions can also be written without SPECTATOR IONS (those that do not contribute to the reaction). These are left out of the equation completely in a form called the NET IONIC EQUATION. This is just the precipitate written as the product of dissociated ions, like so:

Answer 7

Ag+(aq) + Cl−(aq) → AgCl (s)

You see that the ions which do not contribute to the formation of the precipitate are left out of the equation.

Question 8

CARBONATE ion?

Answer 8

CO3 (2-)

Question 9

NITRATE ion?

Answer 9

NO3 (1-)

Question 10

NITRITE ion?

Answer 10

NO2 (1-)

Question 11

PHOSPHATE ion?

Answer 11

PO4 (3-)

Question 12

SULFATE ion?

Answer 12

SO4 (2-)

Question 13

SULFITE ion?

Answer 13

SO3 (2-)

Question 14

How do you convert cm^3 to dm^3?

Answer 14

Divide by 1000. 1 dm^3 = 1000 cm^3.