Save
Busy. Please wait.
Log in with Clever
or
show password
Forgot Password?
Don't have an account?  Sign up 
Sign up using Clever
or
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. Your email address is only used to allow you to reset your password. See 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.
focusNode
Didn't know it?
click below
 
Knew it?
click below
Don't Know
Remaining cards (0)
Know
0:00
edit
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 U2 Flashcards

TermDefinition
Pure Substance A material with a constant composition and consistent properties throughout like an element or a compound.
Mixture A physical combination of two or more substances that are not chemically bonded.
Element A pure substance made of only one kind of atom.
Compound A substance made up of atoms of two or more different elements joined by chemical bonds.
Heterogeneous Mixture A mixture of where you can see the different parts.
Homogeneous Mixture A mixture where you can’t see the different pieces.
Suspension A mixture in which particles can be seen and easily separated by settling or filtration.
Solution A homogeneous mixture of two or more substances.
2 Main Types of Mixtures Heterogeneous and homogeneous.
2 Main Types of Pure Substances Elements and compounds.
Salad Dressing Heterogeneous mixture.
Gatorade Homogeneous mixture.
Carbon (C) Element.
Water (H2O) Compound.
Nitrogen (N) is an Element.
NaCl (Table Salt) is a Compound.
Chex Mix is an example of a Heterogeneous mixture.
Sugar dissolved in water is a Homogeneous mixture.
Center of an atom Nucleus.
Positively charged particles in the nucleus Protons
Negatively charged particles in an atom Electrons
Neutral particles in the nucleus Neutrons
Where electrons are located around the nucleus of an atom Electron cloud.
The number of protons an element has Atomic number
Atomic number is always the same as Number of protons.
The number of protons and electrons are Equal in a neutral atom.
2 particles that have mass Protons and neutrons
Mass number can be found by Adding protons and neutrons.
If you have the Mass Number and number of protons, you can find the number of neutrons by Doing the equation: Mass Number - Protons = Neutrons
If you have the Mass Number and number of neutrons, you can find the number of protons by Doing the equation: Mass Number - Neutrons = Protons
Potassium (K) atomic number 19.
Oxygen (O) atomic number 8.
Atomic number 3 symbol Li (Lithium).
Atomic number 17 symbol Cl (Chlorine).
An isotope is the same type of element, but with a different Mass number.
The unit for the particles in an atom AMU - Atomic Mass Unit
Protons and neutrons have an atomic mass of 1 AMU (atomic mass unit)
If an element has 17 protons and 15 neutrons, what is its mass number? 17 + 15 = 32
Carbon-12 and Carbon-14 are examples of Isotopes - they are the same type of atom (Carbon) but with different atomic masses.
To find % Abundance, you must use this equation to find your percent of isotope: (Part / Whole) x 100 = %
To find Atomic Mass you must use this equation: (% Abundance x Mass Number) + (% Abundance x Mass Number). Repeat until all isotopes have been multiplied and then add all together.
When using % abundance in our Average Atomic Mass Equation, you must remember to: Change the % into a decimal (dividing number by 100/moving decimal point two spaces to the left).
Average atomic mass of Carbon if there is 95% Carbon-12 and 5% Carbon-13 (0.95 x 12) + (0.05 x 13) = 12.05 AMU
Average atomic mass of Aluminum if there is 45% Aluminum-27, 25% Aluminum-26, and 30% Aluminum-28 (0.45 x 27) + (0.25 x 26) + (0.30 x 28) = 27.05 AMU
There are 300 total atoms of Nitrogen. 134 are Nitrogen-13 and 166 are Nitrogen-14. What is the relative abundance of each isotope? (134/300) x 100 = 44.667% Nitrogen-13. (166/300) x 100 = 55.33% Nitrogen-14.
Created by: user-1832640
Popular Chemistry sets

 

 



Voices

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:
Retries:
restart all cards