Make sure you balance every reaction before going the calculation.
I could not make the numbers after elements small. For example, for H2O, the “2” should be small. Please remember this.
I could not make the “=” sign arrows, but they are meant to be arrows.
Draw the 3D drawings for these molecules
Draw Lewis dot drawings for these molecules
Use electronegativity values to calculate the type of bond in these molecules
If these percentages come out of the machine used, what is the true (accurate) formula? If you cannot work out what order to write the atoms in, do some research on the internet.
49.48 % Carbon
5.19 % Hydrogen
16.14 % Oxygen
28.85 % Nitrogen
86.88 % Carbon
13.12 % Hydrogen
Three (only empirical formula)
38.8 % Carbon
16.2 % Hydrogen
Four (only empirical formula)
88.45 % Boron
The rest is Hydrogen
Give me the products of these five common reactions
Na + Cl2 =
C + O2 =
4Fe + 3O2 =
H2O2 = H2O +
Zn + CuSO4 =
BaCl2 + Na2SO4 =
C3H8 + O2 =
There are many different kinds of reactions. Two types we call physical and chemical. Using this information, work out if these reactions are physical or chemical AND explain why you chose it.
A reaction produces a new smell.
A reaction produces a gas and heat, but there is no color change and no new smell and no flame.
A reaction creates a new color, but no new smell. No gas is produces but the temperature changes.
Name these molecules
Using known bond energies, calculate the heat of these reactions. Are they endo or exo or Iso – thermic?
C3H8 + O2 = CO2 + H2O
H2O = H2 + O2
N2 + O2 = NO
H2 = H
CH4 + Cl2 = CCl4 + HCL
Work out these Stoichiometric problems.
1.) HgO = Hg + O2
If 200 g of Hg and 16 g of O2 is produced, what was the mass in grams of HgO that we had at the start?
2.) You are a geologist and you dig up a mass of rock with mass 95 g. You do some experiments and this sample contains 70 % Sodium. What is the mass of pure Sodium in this sample. Your final answer must be in Kg.
3.) If 10 g of KCl dissolves in 200 ml of H20. What is the weigh % of KCl in the solution? The density of H20 is 1 g/ml.
4.) Ca(OH)2 + HCl = CaCl2 + H2O
If 150 g of Calcium Hydroxide, with a Molecular (molar) mass of 75 g/mol. How many moles of HCl will it react with?
5.) C6H12O6 = C2H5OH + CO2
If 360 g of C6H12O6 decomposes and makes CO2 gas, what will the mass in grams of CO2 be?
6.) 75.0 g of Mg and 75.0 g of Cl2 are placed in a beaker and they react like this:
Mg + Cl2 = MgCl2
Which substance is the limiting reagent?
How many grams of the excess reactant remain?
What is theoretical ield in grams of MgCl2?
If 72.0 g of product are actually formed – what is the percentage yield of MgCl2?
7.) 25.0 g of P and 75.0 g of F2 react according to this:
2P + 5F2 = 2PF5
Which substance is the limitng reagent?
How many grams of the excess reactant ramin?
What is the theoretical yield in grams of PF5?
If 41.e g of the product is actualy formed, what is the percentage yield?
8.) If Na2S2O3 + AgBr = NaBr + Na3[Ag(S2O3)2]
How many moles of Na2S2O3 are needed to react completely with 42.7 g of AgBr
What is the mass of NaBr that wll be produced from 42.7 g of AgBr?