Chemistry Flashcards
Matter has anything that has ____ and takes up ______
Mass, space
Chemistry is the study of the ________ of matter and the ________ that matter undergoes
Composition, changes
Why is air classified as matter?
It has mass and takes up space
Why does a shot put have more mass than a hockey puck?
Hockey pucks contain more matter
What is the purpose of an experiment?
To prove/disprove your hypothesis
Which variable is placed on the x-axis (I or D)?
Independent
What is the variable that’s being observed during an experiment called?
The dependent variable
What is a scientific theory and how does it differ from a scientific law?
Theory - Explains how matter behaves
Law - Explains why it behaves that way
TOF: A theory can be easily proven
False
TOF: Scientific laws explain observations
False
A logical approach to the solution of scientific problems
Scientific Method
TOF: A well-planned experiment will disprove a hypothesis
True
Variable that one changes during an experiment
Manipulated Variable
Information obtained through one’s senses
Observation
A proposed explanation for an observation
Hypothesis
A means to test a hypothesis
An experiment
Variable that is observed during an experiment
Responding variable
An iron ball falls to the ground when you drop it: _______
Observation
Earth is a giant magnet, which attracts iron objects: _______
Hypothesis
An iron ball and a piece of wood are dropped from the same height: ________
Experiment
The iron ball and wood fall at the same rate
Observation
Gravity attracts objects in the universe to every other object
Scientific Law
What is the most effective position for heating over the Bunsen burner? Why is this true?
The tip of the blue flame; It’s the hottest part of the flame
How many sig figs are in 2304g
4 sig figs
How many sig figs are in 2340
3
How many sig figs are in 0.02340
4
How many sig figs are in 150000
2
How many sig figs are in 2.340
4
How many sig figs are in 2.603
4
How many sig figs are in 9.760
4
How many sig figs are in 150010
5
How many sig figs are in 1.5 x 10nm
2
How many sig figs are in 2.40 x 10g
3
How many sig figs are in 0.00340
3
How many sig figs are in 105600
4
Round 0.0067987 to 3 sig figs
0.00680
Round 1844863 to 3 sig figs
1840000
Round 4 to 3 sig figs
4.00
Round 6.8578 to 3 sig figs
6.86
Round 30409 to 3 sig figs
30400
Round 2503 to 3 sig figs
250.10kg
Precise meaning
Close to the guessed variable, not the actual
Accurate meaning
Close to the actual variable
What’s the error formula?
Error = Exp - Accurate
What’s the percent error formula?
% Error = error/actual x 100
What’s the base unit for Length?
Meter
What’s the base unit for Temperature?
Kelvin
What’s the base unit for Mass?
Kilogram
What’s the base unit for Time?
Seconds
What’s the base unit for Amount of a Substance?
Mole
What’s a derived unit?
A unit that’s a mathematical combination of base units (m/s, g/cm, etc)
What’s an intensive property?
A property that depends on the composition of matter (Density, boiling point, etc)
What’s extensive property?
A property that depends on the amount of matter (Mass, volume, etc)
What does D=M/V mean?
Density = Mass/Volume
Volume = Density x Mass
