Complete the calculation to the proper number of significant figures
0.0240 x 109840
2640
What is the empirical formula?
The smallest whole number ratio (proportions) of elements in a compound.
What is the limiting reactant?
The limiting reactant is the reactant that is entirely consumed in a chemical reaction. Upon consumption, the reaction stops.
It limits the amount of product that is made.
Balance the equation ___H2 + __O2 --> H2O
2H2 + O2 --> 2H2O
What is avogadro's number?
1 mole of an item = 6.02x1023 of that item
What type of reaction is this?
NaOH + HClO4 --> NaClO4 + H2O
Double replacement
What is the empirical formula of an element that is 15.8% carbon, 84.2% sulfur
CS2
2H2 + O2 --> 2H2O
What is the limiting reactant if 1 mol of H2 and 1 mol of O2 reacts?
Hydrogen is the limiting reactant
Balance the equation Cu + O2 --> CuO
2Cu + O2 --> 2CuO
1.5x1024 hydrogen atoms
Name the following chemicals:
NaClO2
N8O3
FeCl3Sodium chlorite
Octanitrogen trioxide
Iron (III) chloride
What is the empirical formula of a compound that is 40% carbon, 6.7% hydrogen, 53.3% oxygen
CH2O
2H2 + O2 --> 2H2O
What is the limiting reactant if 101 g of H2 and 160 g of O2 reacts?
Balance the equation
NH3 + O2 --> NO + H2O
4 NH3 + 5 O2 --> 4 NO + 6 H2O
What is the molar mass of a 0.359 mole sample that weighs 15.8 g?
44.01 g/mol
PERIODIC TRENDS:
Within a family (up and down) such as the alkali metals, why does atomic radius increase as atomic number increases?
- SHIELDING (increased energy levels)
What is the molecular formula of a chemical with empirical formula C2H6 and molecular weight of 150.4 g/mol?
C10H30
2H2 + O2 --> 2H2O
What mass of water can be produced by 4.04 g of H2 and 24g of O2?
36.04 g of water can be produced
Balance the equation
C3H8 + O2 --> CO2 + H2O
C3H8 + 5O2 --> 3CO2 + 4H2O
What is the mass of 2.53 mol of Cu3(PO4)?
722.62 g
Why is there an increase in first ionization energy from Li to Ne?
- Radius decreases due to increased effective nuclear charge (ie, more protons attract the added electrons in the same energy level)
- decreased radius = greater attraction experienced by valence electrons
- more energy to remove an electron = higher 1st ionization energy
What is the molecular formula of a chemical with the composition of 86.88% carbon and 13.12% hydrogen, with a molecular weight of 165.33 g/mol.
C12H21
Cl2 + 2NaBr --> 2NaCl + Br2
What is the limiting reactant if 35.45 g of chlorine gas reacts with 25.72 g of NaBr?
Balance the equation
C6H5COOH + O2 --> CO2 + H2O
2C6H5COOH + 15O2 --> 14CO2 + 6H2O
How many hydrogen atoms are in a 28.3 g sample of H2SO4?
3.47x1023 hydrogen atoms