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. Section 1.

Section 1- formulas and equations

atoms are made of? protons and neutrons are within the nucleus, and electrons surround the nucleus in orbitals.
What are electrons, protons and neutrons charge and relative mass? Electron- 1/200 relative mass, -1 charge. Proton- 1 relative mass, +1 charge Neutron- 1 relative mass, 0 charge
what is the mass number? the total number of neutrons plus electrons.
atomic number? the amount of protons in the nucleus. (also the same as the number of neutrons)
What are ions? Ions are elements with different numbers of protons and electrons. e.g Br - has a negative charge meaning it has one more electron than protons. e.g Mg 2+ has 2 fewer electrons than protons.
What are isotopes? Are atoms of the same element with different numbers of neutrons.
What is the relative atomic mass? is the average mass of an atom of an element on a scale of an atom of carbon-12 is 12.
what is the relative isotopic mass? is the average mass of an atom of an isotope of an element on a scale of an atom of carbon-12 is 12.
what is the relative molecular mass? is the average mass of a molecule on a scale where an atom of carbon-12 is 12.
What is the Molar mass? is just the same as the relative molecule mass.
how do you work out the molar mass? number of moles= mass of substance/molar mass
how do you work out how many moles is in a solution? number of moles= concentration x volume (in dm3)
how many dm3 in a cm? dm3= 1000 cm
what is parts per million? ppm- used for very small amounts e.g % of gasses, like there is 0.000 009% xenon in the atmosphere. Therefore there are this amount in every 100 parts of air. So you can multiply both by 10 000 to make it easier to work with making 0.09 ppm of xenon!
Empirical and molecular formulas? Are ratios empirical- smallest whole number ratio of atoms in a compound. Molecula- gives the actual number of atoms in a molecule. (for more info see page 8 & 9 in textbook)
Look at page 10 & 11 for equations and calculations and page's 12 & 13
Created by: brontemunro



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