Busy. Please wait.
or

show password
Forgot Password?

Don't have an account?  Sign up 
or

Username is available taken
show password

why


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.

Remove Ads
Don't know
Know
remaining cards
Save
0:01
To flip the current card, click it or press the Spacebar key.  To move the current card to one of the three colored boxes, click on the box.  You may also press the UP ARROW key to move the card to the "Know" box, the DOWN ARROW key to move the card to the "Don't know" box, or the RIGHT ARROW key to move the card to the Remaining box.  You may also click on the card displayed in any of the three boxes to bring that card back to the center.

Pass complete!

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




share
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

Chemistry Ch. 1

QuestionAnswer
Atoms combine to form? molecules
Scientific laws describes... HOW nature behaves
A scientific law can be proven... over and over
A good hypothesis is ____meaning it makes predictions that can be confirmed or refuted by further explanations. falsifiable
The Law of Conservation of Mass states: matter is neither created or destroyed
We call a specific instance of matter a ___ substance
What are the characteristics of a solid? fixed volume, tightly packed and rigid shape
A pure substance is either an ___ or ___ element or compound
A mixture is 2 or more substances that are not chemically combined
An element is a substance that cannot be broken down into anything simpler
What is a compound? 2 or more chemically combined elements
When the mixture looks the same throughout, this is called a ____ homogeneous mixture
A heterogeneous mixture is a mixture that____ looks different throughout (you can see the different particles)
What is decanting? separating a solid from a liquid by carefully pouring off liquid
Volatile means ____ easy vaporizable
Matter can be broken down into what 2 categories? A pure substance and mixture
A mixture can be ____ or _____ homogeneous / hertergoneous
A property that changes when the size of the sample changes is a ____. extensive property
Examples of an extensive property are: mass, volume and length
An intensive property: doesn't change when you take away some of the sample
Temperature, color, hardness, melting point, and density are examples of an ___ property intensive property
Pouring a mixture through a filter paper to separate the solid from the liquid is called___ fifltration
Distillation is a process where ___ liquids are boiled offf
Unit for length: meter (m)
Unit for mass: kilogram (kg)
Unit for time: second
Unit for amount of subtsance: mole (mol)
With a physical change, the ___ changes, the substance does not appearance
In a chemical change, the ____ change substance
How close a particular measurement is to the correct value is the ____ accuracy
Precision is: the consistency of repeated measurement
The more consistent the results, the more ____ the measurement is precise
Numbers are not significant when: 1. they are leading zeros 2. zeros at the end of a number doesn't have a decimal point
The more digits, the __ certainty more
The less digits, the __ certainty less
Numbers that have NO certainty are called: exact numbers
An error that tends to be too high or too low are called: systematic errors
given unit x desired unit/given unit = desired unit
Created by: Mariahj25