n=N/Na
How many particles in 1 mole
6.02 x 1023 particles
Molar mass of carbon?
12.0 g/mol
What is the formula to use if you have the concentration and volume but need to determine the number of moles?
n = c x V
What does the little m stand for?
Molar mass OR molecular mass
What is the independent Variable?
The thing you are investigating the effect of. So it's the thing you change between trials.
How many carbon atoms in 1.5 moles of CO2?
9.03 x 1023 carbon atoms
Molar mass of O2
32.0 g/mol
How many moles of HCl are in 300mL of a 2.0 M HCl solution?
0.600 mol
What iteration of the formula would I use to calculate molar mass if given the mass and number of moles?
mass / number of moles = molecular mass
What do you think will change as a result of your IV?
The dependent variable, so you measure or observe it in the experiment.
How many moles is 1000 atoms?
1.66 x 10-21
What are the steps to calculate molar mass
Write the molecular formula so you know how many of each atom.
Multiply the atomic masses by how many are in the molecule
Add those atomic masses together
Units are g mol-1 or amu (atomic mass units)
What is the molarity of a solution with 0.30 mol of NaCl in 3.6 L of solution?
0.8M
what is the mass of 2.5 mols of CO2?
M(CO2)=44.0 amu
110 g
How does the amount of sleep affect test performance? What would be the DV in this experiment?
Test performance or score.
The IV was the amount of sleep.
How many hydrogen atoms in 0.2 moles of H2O?
2.408 x 1023 hydrogens (there are two hydrogens in every H2O)
Which has a larger molar mass? CO2 or butane?
butane
What volume of DI water would be required to make up a 0.5 M solution if you have exactly 0.30 moles of solute?
v = n / c
0.60 L
How many moles or in 5.2 grams of water?
0.28888889 mol
rounds to 0.29 moles (2 decimal places)
The IV and DV in this investigation:
What is the effect of temperature on the solubility of a solid, like salt, in water?
Independent Variable: Temperature of the water.
Dependent Variable: Amount of salt that can dissolve (solubility).
which is a larger number?
1 mole
60220000000000000000000
1 mole
The molar mass is 32.0 g mol-1
Ozone (O3), methane, methanol or methanoic acid
methanol
If I have 500mL of a 0.25 M HCl solution, but am only allowed to use 0.1 M HCl with my year 7 class, how much water would I need to add to dilute it to that concentration?
c1 v1 = c2 v2
1.0 x 0.5 = 0.1 x V
V = 1.25 L so need to add 750 mL
How many grams of HCl would be required to Neutralise 25.0 grams of NaOH?
22.8 grams of HCl
A research question fitting these variables:
Which fertilizer type helps tomato plants grow the tallest?