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Midterm Lab Chemistry
Terms in this set (54)
What does the blue diamond on safety labels represent?
Health (how hazardous)
What does the red diamond on safety labels represent?
Flammability (how flammable or volatile)
What does the yellow diamond on safety labels represent?
Instability (how capable of detonation/ explosion)
What does the white diamond on safety labels represent?
Special (avoid use of water, or oxidizer)
What do the numbers on safety labels mean?
0-4 how dangerous the chemicals are, with 4 being the most dangerous in the diamond it is in
eye wash station
used to wash chemicals from your eyes
used to rinse the skin or clothing of a hazardous chemical
Used to remove chemicals from the body
Safety equipment made of specially treated, fire resistant fabric and used to smother fires.
What is correct lab attire?
Closed toe shoes, pants below the knee, shirt that is not cropped or exposing below the neck, no dangling sleeves or jewelry, hair tied back
Goggle are to be worn when...
Working with chemicals in the lab
What does RAMP stand for?
recognize hazards, assess risks, minimize risks, prepare for emergencies
What is a hazard?
any source of potential injury, harm or damage
What is risk?
The likelihood you can be harmed by a hazard
What affects risk?
How likely you will be harmed, and how severe the injury or damage will be
What do you use to turn the gas on for a Bunsen burner?
Gas inlet valve (or spigot)
What does the striker do with a Bunsen burner?
It ignites the gas
What does the dial on a Bunsen burner do?
Allows more gas in
What does the shaft in a Bunsen burner do?
Allows more air in
If the Bunsen burner flame doesn't have an inner blue cone, what do you do?
Adjust the shaft and dial
When do you use least number of significant figures for your answer
When do you use least number of decimal places for your final answer in significant figures?
What is the percent error equation?
(experimental value-accepted value)/accepted value x 100
What is accuracy and how do you assess it?
It is how close the value calculated is to the accepted value, you find this by using the percent error equation
What is a sampling error?
when the sample does not represent the population (is the exception)
What is a measurement error?
When the devices and equipment used in lab has an error, this can be prevented by calibration
What are personal errors?
Misinterpretation, misreading, and bias
What is precision and what impacts it?
The spread of the recorded measuremnts
What precision is repeatability?
The precision of how easy it would be to redo the lab
What does reproducibility precision mean?
The precision of how "copyable" the data is
What is the formula for density?
What is the difference between a physical and chemical property?
A physical property can be observed without forming a new substance (malleability is a physical property) but flammability, reactivity, acidity, and more are chemical changes as they describe how able a substance change be change chemically.
What are some examples of physical changes?
Phase changes, cutting, rotation, making or separation of mixtures and solutions, etc.
What are some examples of chemical properties?
Formation of gas, change in mass, cooking, rotting, rusting, etc.
Sublimation is what
solid to gas
Deposition is what
Gas to solid
Vary on the amount of the substance. Examples are mass, weight, and volume.
do not depend on the amount of matter present. This includes the color, melting point, boiling point, physical state at given temperature, density, and electrical conductivity.
How do you use an equation to show physical change?
Equations for phase changes:
H2O (g) —> H2O (l)
How do you use an equation to show chemical changes?
Equations for new creation of molecules:
2H2O2 —> 2H2O + O2
What c stand for in equations?
Speed of light
What does lamba represent?
What does nu (weird v) represent?
What does h represent?
What does the E equation solve for
The energy of each quantum/ ohoton
What does E_n represent?
The amount of energy of an electron in the n sublevel
How can substances be identified with flame tests?
Saturate wood sticks with the given substance, and put them into a flame. The color of the flame can then determine the chemical.
Why do different metals give off different colored flames?
Light is dependent on the wavelength, which depends on the energy given off from the electrons as they return to their ground states.
How are emission spectra obtained for elements?
Heated elements are put thorough a slit, through a prism, and projected onto a black panel, producing various colored lines.
What are emission spectra?
the emissions of light from excited electrons returning to ground states
Characterize which transitions between and among energy levels in an atom result in absorbance or emittance of energy.
As electrons become excited or move to a higher/ more outer energy level, this is an absorption of energy. It is a release of energy when electrons return to their ground state.
When electrons return to their ground state, they release what?
Energy in the form light
C1V1=C2V2 and M1V1=M2V2 are equations used to find what?
The concentration of a solution
What is the volume delivered formula?
V(total) = V(final) - V(initial)
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