Stoichiometry
What does it mean to say an equation is balanced? Why is it important for an equation to be balanced?
An equation is balanced when the same number of each element is represented on the reactant and product sides. Equations must be balanced to accurately reflect the law of conservation of matter.
what is the formula you use in stoichiometry practice problems for gas laws?
ideal gas law: PV=nRT
Which group metals are always soluble
Group 1 metals (alkali metals)
What is the oxidation state of free elements?
0
When we compress the gas in a container, will the pressure increase or decrease
Pressure will increase
In the following chemical equation, N2(g) + 3H2(g) → 2NH3(g), 1 mole of nitrogen reacts with 3 moles of hydrogen to form how many moles of ammonia?
2 moles of ammonia
If 4.000 grams of hydrogen peroxide is placed within a sealed 250 milliliter container at 500 K. What is the pressure of the oxygen gas produced in atmospheres?
9.65atm
What is an acid?
A compound that dissolves in water to produce H+
What are the products of a combustion reaction?
CO2 and H2O
Which gas constant is used for the root mean square?
R=8.314 J÷(mol•K)
Sn(s) + 2HF(g) → SnF2(s) + H2(g)
How many moles of hydrogen fluoride are required to react completely with 75.0 g of tin?
1.26 mol HF
What are the two different values for the gas constant
R= 0.08206 (L•atm)÷(mol•K) used for PV=nRT
R= 8.314 (J)÷(mol•K) used for Vrms
Which product will always occur (at least in Chem 1A) in an acid-base reaction
H2O (l)
A student isolated 25 g of a compound following a procedure that would theoretically yield 81 g. What was his percent yield?
31%
What is the standard temp and pressure (in SI units)
273.15 K and 100 kPa
Sr(OH)2(aq) + H2O → Sr(aq) + 2OH-(aq)
There is 1L of a 2.0M solution of strontium hydroxide. Find the molarity of 2OH-(aq)
4.0 M OH-
A weather balloon has a volume of 35 L at sea level (1.0 atm). After the balloon is released it rises to where the air pressure is 0.75 atm. What will the new volume of the weather balloon be?
47 L
From the chemical equation, write the complete ionic equation:
CaCO3 (s) +H2SO4 (aq) → CaSO4 (s) + CO2 (g) + H2O (l)
CaCO3(𝑠)+2H+ (𝑎𝑞)+SO42- (𝑎𝑞)⟶CaSO4(𝑠)+CO2(𝑔)+H2O (𝑙)
find the amount of grams of NaCl produced by 18 g of HCl. HCl + NaOH → H2O + NaCl
29 g NaCl
What is the limiting reactant in a reaction that produces sodium chloride from 8 g of sodium and 8 g of diatomic chlorine?
Cl2
A 0.3420-g sample of KO4C8H5 reacts with 35.73 mL of a NaOH solution in a titration. What is the molar concentration of the NaOH?
KO4C8H5 (aq)+NaOH(aq) → NaKO4C8H4(aq) + H2O (aq)
0.04684 M NaOH
What volume of carbon dioxide is produced by the combustion of 25.21 g of ethanol (C2H5OH) at 54°C and 728 mmHg? Assume the gas is ideal.
30.6 L
Which of the following are soluble? Cu(OH)2 NaNO3 NH4Cl Li2S
Sodium hydroxide is a strong base. Find the pH of a solution prepared by dissolving 1.0 g of NaOH into enough water to make 1.0 L of solution.
pH = 12.40
What did Aisha post in the discord about the KMT?
Graph of vrms relating speed of particle and number of particles at said speed