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Chem Exam 1- Chapter E and Chapter 2
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Gravity
Terms in this set (35)
the numbers obtained when you measure a quantity such as your height, weight, or temperature.
measured numbers
significant figures are
- Used to represent the amount of error associated with a measurement
- All nonzero digits and zeros between digits
- Non zeros that act as placeholders before digits
- Zeros at the end of a decimal number
A number is a significant figure
- if it is not a zero
- if it is a zero between non zero digits
- a zero at the end of a decimal #
- In the coefficient of a number written in scientific notation
A zero is not significant if is
- At the beginning of a decimal number
- Used as a placeholder in a large number without a decimal point
Multiplication and Division with SF
Answer is written so it has the same number of significant figures as the measurement with the fewest significant figures.
Adding and subtraction with SFs
final answer written so that is has the same number of decimal places as the measurement with the fewest decimal places.
amount of space occupied by a substance
volume
basic unit of volume
liter
basic unit of mass
kg
a value of 36 mL is a measure of
volume
a value of 345 mm is a measure of
length
the measurement of the gravitation pull on an object is its
weight
largest unit:
decimeter
micrometer
millimeter
meter
kilometers
kilometers
relationship between grams and micrograms
1 g= 1 000 000 mug
smallest unit:
kilogram
gram
microgram
miligram
decigram
microgram
cubic centimeter has same volume as
milliliter
relationship between millimeters and centimeters
10 mm/1 cm
frequency
cycles per second
wavelength
the distance a wave travels in one cycle
amplitude
height of a wave crest or depth of a trough. brightness
The speed of light is _____
constant
formula
speed of light= frequency times wavelength
3.00 x 10⁸ m/s
highest energy out of colors
violete
lowest energy out of colors
red
if frequency is high, wavelength is
low
threshold frequency
if you are not above minimum frequency, no current will flow. once the correct frequency is reached, there is no lag time.
the energy of an atom is
fixed
the threshold frequency is the exact ---
energy you need to kick out an electron
the size of a photon depends on
the frequency of light
light is emitted when
an element is vaporized
Rydberg equation
1/wavelength = R (1/n₁² - 1/n²₂
Bohr Model
- each state is associated w fixed circular orbit of electron around nucleus
- the higher the energy level, the farther the orbit is from the nucleus
- when the H electron is in the first orbit, the atom is in its lowest energy state, called the ground state
when electron is in any orbit higher than n=1,. atom is in
excited state
the energy of photo equals
difference between the two energy states
Which ones in Bohr model can we see and can't see?
We can see Balmer.
can't see paschen or Lyman
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