Grade 10 Chem Test 1

Question 1

solution

Answer 1

a homogeneous mixture of one or more solutes in a solvent

Question 2

solvent

Answer 2

a liquid substance (called the medium) in which solutes are dissolved

Question 3

solute (s)

Answer 3

substance dissolved in a solvent (usually in solid form prior to dissolving)

Question 4

how to go from grams to moles

Answer 4

divide by the molar mass

Question 5

how to go from moles to grams

Answer 5

multiply by the molar mass

Question 6

solution pyramid

Answer 6

moles= concentration x volume

Question 7

moles=

Answer 7

concentration x volume (mol)

Question 8

concentration=

Answer 8

moles / volume (mol/L) or (M)

Question 9

volume=

Answer 9

moles /concentration (mL or L)

Question 10

how to go from moles to particle

Answer 10

multiply by 6.02 x 10^23

Question 11

how to go from particles to moles

Answer 11

divide by 6.02 x 10^23

Question 12

definition of concentration

Answer 12

how much substance is dissolved in a given solution - more solute per solvent, results in higher concentration

Question 13

molarity/ concentration

Answer 13

moles/liters or mmol/mL (M)

Question 14

PYRAMID

Answer 14

moles = concentration x volume

Question 15

how to go from L to mL

Answer 15

multiply by 1000

Question 16

how to go from mL to L

Answer 16

divide by 1000

Question 17

how to solve when we have two solutions

Answer 17

M1 x V1 = M2 x V2

mainly used in dilutions

Where M1 is initial concentration and V1 is initial volume

Where M2 is final concentration and V2 is final volume

Question 18

how to find molar mass of a solute

Answer 18

recognize that
moles= mass/molar mass

realize that molar mass is g/mol

do the grams / the amount of mol you calculated