Lab Safety
One piece of lab safety equipment
goggles, eye wash, fire extinguisher or blanket, shower
What are the rules for a zero to be considered significant?
The zero is between two non-zero digits (909)
The zero is trailing significant digits WHEN a decimal is present
What are the 3 metric units and what do they measure?
Mass (g) volume(L), distance(m)
Whats the first thing we do to begin a dimensional analysis problem?
Write the known over 1 or decide which conversion factors are needed
Write 340,000 in scientific notation.
3.4 x 105
If anything were to spill or glass were to break in the lab, you should....
Tell the teacher right away to recieve proper instruction
How many sig figs are in...
0.000789
THREE
100cm
How many hours is 4 seconds?
0.01
Write .0000000087 in scientific notation
8.8 x 10-9
When SOMETHING catches fire within the lab, you should...
Grab the fire exinguisher!
How many sig figs are present in 723.0
FOUR
Convert 3000mL into Liters?
3 Liters
Convert 240 inches into meters
24 meters
Add these two together....
(8.5 x 107) + (8.5 x 107)
1.7 x 108
When SOMEONE is on fire, you should grab the...
fire blanket
Whats the correct answer with the correct sig figs?
4.50 x 2.005
9.02
How many Kilometers are in a centimeter?
100,000cm in a kilometer
Convert 1.47 centuries into minutes.
77,263,200
How would you describe zeroing out the triple beam balance?
.... accounting for any mass on the scale outside of the desired substance trying to obtain.
When flames are spewing out of the gas nozzle in the lab, you should....
Run and shut the gas valve off or turn off the light switch (automatic shut off)
What is the answer to the following problem with proper sig figs?
0.6100 + 123.4= ?
124.0
How many decimeters are in a hectometer?
1000 decimeters
You'll need about 7 fill ups or 6 3/4ths a tank!!!
Describe with every detail how to measure out 20g of H2O
First weight out something to put water in. Zero out the scale, add the 20g to the weight that was found. Add amounts until perfectly balanced.