Busy. Please wait.

show password
Forgot Password?

Don't have an account?  Sign up 

Username is available taken
show password


Make sure to remember your password. If you forget it there is no way for StudyStack to send you a reset link. You would need to create a new account.
We do not share your email address with others. It is only used to allow you to reset your password. For details read our Privacy Policy and Terms of Service.

Already a StudyStack user? Log In

Reset Password
Enter the associated with your account, and we'll email you a link to reset your password.
Didn't know it?
click below
Knew it?
click below
Don't know
Remaining cards (0)
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

  Normal Size     Small Size show me how

Chem 1 - Amount

Amount of a Substance

Relative Atomic Mass The weighted Average of a mass of an atom of an element, taking into account its naturally occurring isotopes, relative to 1/12th the mass of Carbon-12.
Relative Atomic Mass Formula = Ar = (Average mass of an atom of an element) / (1/12 of mass of atom of Carbon-12)
Relative Molecular Mass The relative molecular mass of a molecule is the mass of that molecule relative the mass of an atom of Carbon-12. Add the Ar of the Atoms in the molecule.
Relative Molecular Mass Formula = Mr = (Average Mass of a Molecule) / (1/12th mass of an atom of Carbon-12).
Avagardo Constant: The Number of molecules in 12 grams of Carbon-12. 6.022 x10^3
Number of Moles = Mass of what you have / Mass of 1 mole (Mr).
Pressure = Force / Area
Describe the effects on pressure for the following variables: Temp, Volume, Number of Moles: Temp: increasing temp increases pressure, the inverse is true. Volume: Increasing Volume decreases pressure, inverse also true. No of Moles, Increasing the no of moles increases pressure, inverse true.
Ideal Gas Constant: PV=nRT (Pressure x Vol = No of Moles x Constant x Temp).
Units of the Ideal Gas Constant Vol = M^3, Temp = Kelvin (K), Pressure = Pa, R = J K-1 Mol-1.
Empirical Formula: A formula showing the simplest whole number ratio of atoms of each element in a compound.
Molecular Formula: A formula showing the actual number of each atom in a compound.
What method is used to find Empirical Formula? Combustion Analysis. Compound is burnt in Oxygen and then the products by mass are analysed.
How to Calculate Empirical Formula: Workout Number of moles of each element, divide all numbers by lowest amount, find ratio.
Moles in a Solution: (Concentration (M) x Volume (V)) / 1000
Concentration = Number of moles / Volume
When can we use the ideal gas equation? To calculate the amount of gas produced in a Reaction
How can we find concentration, experimentally? Using a Titration. So long as we know the concentration of the acid and equation between them.
Write a common Ionic equation: H+ + OH- ---> H20
Titration explain the steps: Fill burette with Acid (known concentration), measure out Alkali with Pipette and add to Flask with indicator, slowly add in acid until neutral, repeat until 2 results are the same.
Atom Economy (percentage): (Mass of desired produce / Amount of reactants) x 100
Reaction Yield (%): (Mass (or moles) of desired product / theoretical maximum amount of desired product) x 100
Created by: mjwilson1988



Use these flashcards to help memorize information. Look at the large card and try to recall what is on the other side. Then click the card to flip it. If you knew the answer, click the green Know box. Otherwise, click the red Don't know box.

When you've placed seven or more cards in the Don't know box, click "retry" to try those cards again.

If you've accidentally put the card in the wrong box, just click on the card to take it out of the box.

You can also use your keyboard to move the cards as follows:

If you are logged in to your account, this website will remember which cards you know and don't know so that they are in the same box the next time you log in.

When you need a break, try one of the other activities listed below the flashcards like Matching, Snowman, or Hungry Bug. Although it may feel like you're playing a game, your brain is still making more connections with the information to help you out.

To see how well you know the information, try the Quiz or Test activity.

Pass complete!

"Know" box contains:
Time elapsed:
restart all cards