Key Questions Lesson 9
a) 3.2 mol of aluminum or 4.6 mol of sulphur
MAl = 27.00 g/mol
m= n x M
m= 3.2 mol x 27.00 g/mol
m= 86.4 g
(round to 2 sig-figs)
= 86 g
MS = 32.06 g/mol
m= n x M
m= 4.6 mol x 32.06 g/mol
m= 147.476 g
Key Questions Lesson 13
a) Cloudy pond water is heterogeneous because it is cloudy and there are visible particles.
b) Apple juice is a solution because there are no visible particles. The solute is sugar and artificial apple
flavoring and the
Key Questions Lesson 16
59. The Arrhenius theory theorizes that acids ionize to release the hydrogen ion when dissolved in water.
This theory helps explain why some acids are strong and others are weak. It explains this by suggesting
that some substances
Key Questions Lesson 8
23. Identify the following combustion reactions as complete or incomplete.
24. Complete the following combustion reactions. Make certain your equations are balanced.
a) C7H16 + 11O
Key Questions Lesson 15
Vsolute = 30.0 mL
Vsolution = 600. mL
The solution has a 5%V/V concentration by volume.
mNaHCO3 = 35.5g
( 22.99+1.01+12.01+ 48 ) g /mol
Key Questions Lesson 5
14. Write the chemical name for each of the following substances.
Calcium (II) chloride or calcium chloride
Iron (III) nitrate
Mercury (II) sulphate
Key Questions Lesson 14
a) 3Ba(OH)2 (aq) + 2(NH4)3PO4 (aq) Ba3(PO4)2 (s) + 6NH4OH (aq)
The precipitate formed will be barium phosphate.
b) AgNO3 (aq) + KC2H3O2 (aq) AgC2H3O2 (s) + KNO3 (aq)
The precipitate formed will be silver acetate.
c) Cu2SO4 (aq)
Key Questions Lesson 7
20. Identify the following household substances as either very acidic, slightly acidic, very basic,
slightly basic, or neutral.
a) Muriatic acid, pH = 1: Very acidic
b) Washing soda, pH = 10: Slightly basic
c) Milk, pH = 6.8: Slight
Key Questions Lesson 4
Substance A has the properties of a non-polar covalent molecular substance. It has a very low melting
point and is insoluble in water.
Substance B has the properties of a small polar covalent molecular substance. It has a ve
Key Questions Lesson 6
17. Identify each of the following reactions as synthesis, decomposition, single displacement, or
a) Single displacement
d) Double displacement
f) Single displaceme
1. Chemical formula for the compound
2. Classify the type of compound
Titanium Dioxide is an ionic compound, I know because it is composed of one metal and
3. Briefly list proper storage, safe use and dispos
Key Questions Lesson 18
64. Comparison between solid and gas:
a) In solids the attractive forces between the molecules are great enough to overcome the movement of
molecules dues to kinetic energy. The molecules are generally packed very closely together
Key Question Lesson 12
2C2H3NO + H2O CO2 + C3H8N2O
If explosion was caused by the decomposition of ammonium nitrate the balanced equation would be:
2NH4NO3 2N2 + 4H2O + O2
If the explosion was caused by sodium dichloroisocyanurate an
Key Questions Lesson 2
a) List all of the numbers in the table that refer to:
i) Alkali Metal: 1
ii) Halogen: 8
iii) Alkaline Earth Metal: 2
iv) Noble Gas: 9, 10
v) Elements in period four: 1, 3, 8
b) Non- metals: 4, 6, 7, 8, 9, 10
4. Na, Si, C.
Key Questions Lesson 19
a) Boyles Law. It is an inverse relationship, the pressure increases while the volume decreases.
Temperature and quantity of gas must be constant.
b) Gay Lussacs Law. It is a direct relationship, the temperature increases and t
Key Question Lesson 17
Dear Prime Minister,
This letter is in regards to the carbon tax. Throughout this letter I would like to discuss what the carbon
tax is and the advantages and difficulties associated with it:
A carbon tax is a tax that i
Key Questions Lesson 11
a) 2Na + 2H2O 2NaOH + H2
nNa = 2.75 mol
nH2O = 4.25 mol
In reaction, 2 mol Na required 2 mol H2O to react
2.75 mol Na will require z mol H2O to react
z = 2.75 mol x
z = 2.75 mol
2.75 mol of sodium n