Chemical Equations
(February)
(February)
What could the "Common Polyatomic Ions List" be used for?
Finding names and symbols.
What's most commonly used as measurement for Molar Mass?
A rule of Mole Ratio is?
Divide each number in the fraction by the smaller number of moles
Free points, you have to get all the questions right in order to gain points.
Bonus; Who's the founder of Chemistry? (Extra 100)
(The following was gathered VIA website, credits to that because I can't come up with a problem on my own.)
(FREE POINTS!!)
Bonus; Antoine-Laurent Lavoisier
What is the pH given [H+] = 4.1 x 10-4
3.39
What are "arrow words?"
What's a Synthesis reaction?
A chemical process which two, maybe more, simple elements (or compounds) combine to form a complex product than originally.
The Mole Ratio method is?
A property of a solution is plotted against the molar ratio of the two reactants, the concentration of one being kept constant.
(Similar to the definition)
The number of moles and the mass (in grams) of chlorine, Cl2, required to react with 10.0 g of sodium metal, Na, to produce sodium chloride, NaCl.
2Na+Cl2→2NaCl2Na+Cl2→2NaCl
0.217 mol Cl2
15.43 g Cl2
Which one is more acidic?
Bleach (12-14), Aspirin (2-4), or Coffee (4-6)?
Aspirin (2-4)
What does it mean for a molecule if a "gas" were to follow a nonmetal?
The molecule would be Diatomic.
How can you find the molar mass? (generally)
Adding the standard atomic mass of the constituent atoms
What is Stoichiometry?
The determination of the proportions in which elements or compounds react with one another
The number of moles and the mass (in milligrams) of diatomic oxygen formed by the decomposition of 1.252 g of mercury(II) oxide.
2HgO→2Hg+O22HgO→2Hg+O2
0.00289 mol O2
92 mg O2
What is the hydrogen ion or [H+] if pH = 8.5?
3 x 10^-9 M
What does solid magnesium metal react with to form solid magnesium hydroxide and hydrogen gas?
Liquid water.
What's Molar Mass?
Defined as "Mass per mole." / The sum of a mass of all atoms found in one mole's worth of a substance.
The formula for Stoichiometry is?
Based on the law of conservation of mass where the total mass of reactants is equal to the total mass of the products.
The number of moles and the mass (in g) of sodium nitrate, NaNO3, required to decompose and produce 128 g of diatomic oxygen, where NaNO2 is the other product.
2NaNO3→2NaNO3+O22NaNO3→2NaNO3+O2
8 mol NaNO3
680 g NaNO3
What is the pH of an aqueous solution that is 3.4 x 10-7 M in hydronium ion (represented by the H+ ion)?
6.47
What are the four steps to writing a chemical equation?
1. Find "arrow words"
2. Identify R and P. LS->RS
3. Find "+ words" = with, and, reacts with, and *
4. Identify the individual molecules for R and P, along with their physical states
What's Mole Ratio?
The ratio between the amounts in moles of any two compounds involved in a balanced chemical reaction
The steps to Stoichiometry are:
Step 1: grams of A is converted to moles by multiplying by the inverse of the molar mass.
Step 2: moles of A is converted to moles of B by multiplying by the molar ratio.
Step 3: moles of B is converted to grams of B by the molar mass.
The number of moles and mass (in grams) of C2H4 required to react with water to produce 9.55 g C2H6O.
C2H4+H2O→C2H6OC2H4+H2O→C2H6O
0.207 mol C2H4
5.81 g C2H4
If the concentration of hydronium ions was 0.01 M, what would the pH be?
Use: pH = -log [H3O^+1]
It's 2
That's it