Chapter 10 :Chemical Quantities

Question 1

Mole (mol)

Answer 1

SI unit for measuring the amount of a substance.

Question 2

Avogadro’s number

Answer 2

6.02X10^23 ( number of representative particles

Question 3

Representative particles

Answer 3

refres to the species present in a substance (usually atoms, molecules, or formula units)

Question 4

The mole allows chemists to…

Answer 4

count the number of representative particles in a substance

Question 5

Molar Mass

Answer 5

the mass of a mole of an element

Question 6

Avogadro’s hypothesis

Answer 6

equal volumes of gases at the same temperature and pressure contain equal numbers of particles.

Question 7

Standard Temperature and Presure (STP)

Answer 7

Temp = 0 degrees C
Pressure = 101.3 kPa
1 mol (6.02X10^23) rep. part. of any gas has a volume of 22.4 L

Question 8

Molar volume

Answer 8

(22.4L gas) used to convert bt the # of moles of gas and the volume of gas at STP

Question 9

Percent composition

Answer 9

the relative amounts of the elements in a compound

Question 10

Empirical formula

Answer 10

gives the lowest whole-number ratio of the atoms or moles of the elements in a compound