Sig Figs go figure
What is the total number of sig figs in 0.00456 and why?
3 sig figs since the 00s preceding are placeholders
A graduated cylinder
Convert 5 km to m. Show all work on WB
5km (1000m/1km) = 5000 m
Write the number 300000 in scientific notation
3 X 10^5
Where are you allowed to eat/drink in my room?
At the buffet tables ONLY not at lab tables
Round 123.456 to 3 sig figs
123
What piece of lab equipment should you NOT estimate the last digit? Why?
The electronic balance since it estimates for you
Convert 3.5 mL into L
3.5 mL (1L/1000 mL) = 0.0035
Convert the scientific notation 4.5 X 10^3 into standard notation:
4500
If a person is on fire, what should you do to help them? Where is the thing to help them?
Give them the fire blanket so they can stop/drop/roll. Fire blanket is in the corner next to the goggles
5.540 + 7.5 = with sig figs
13.0, 3 sig figs one decimal place
This piece of lab equipment provides stability and something for clamps to attach to:
A ring stand
If a car travels at a speed of 60 miles per hour how many feet does it travel in 1 minute? (1 mile = 5280 feet)
60 miles/hr(5280 ft/1mile)(1hr/60 min) = 5280 feet/min
What is 3.4 X 10^-8 in standard notation?
0.000000034
Name 3 personal protective equipment that should be worn during labs with chemicals
Goggles
Apron
Closed Toe Shoes
Explain why 2500 has only 2 sig figs and 2500. has 4
No dec: count SF after first non zero from right to left (2 0 place holders)
Dec: count SF after first non zero from left to right
What piece of equipment would support a crucible being heated by a bunsen burner? (hint: already has a ring clamp)
A clay triangle
A car's fuel efficiency is rated at 30 miles per gallon. Convert this to kilometers per liter, then calculate how many liters of fuel the car would use to drive from New York to Los Angeles (a distance of 2,789 miles).
(1 gallon = 3.78541 liters, 1 mile = 1.60934 km)
Step 1: (30 mi / 1 gal) × (1.60934 km / 1 mi) × (1 gal / 3.78541 L) = 12.75 km/L
Step 2: 2,789 mi × (1.60934 km / 1 mi) = 4,488.44 km
Step 3: 4,488.44 km ÷ (12.75 km/L) = 352.03 L
What is 0.0000055 in scientific notation?
5.5 X 10^-6
When heating a test tube directly in a bunsen burner flame it is important to do what?
Point the test tube AWAY from you at an angle and rotate it to heat it evenly
3.45 X 10^7 / 60000 with sig figs
600, 1 sig fig from 6000
What 2 pieces of equipment are used to evaporate a liquid from a solution to recover a dissolved solid?
An evaporating dish and watchglass
A satellite orbits Earth at an altitude of 400 km, completing one orbit every 92.65 minutes. Calculate its speed in km/h, then convert this to meters per second. (Earth's radius = 6,371 km, use 2πr for orbit circumference)
Step 1: Orbit circumference = 2π(6,371 km + 400 km) = 42,568.97 km
Step 2: 42,568.97 km ÷ (92.65 min / 60 min/h) = 27,580.82 km/h
Step 3: 27,580.82 km/h × (1000 m / 1 km) ÷ (3600 s / 1 h) = 7,661.34 m/s
What is the product of 2.0 X 10^4 and 3.0 X10^2 in scientific notation?
6.0 X 10^6
Why should you NEVER have to use the eyewash station or the shower?
You will ALWAYS wear your goggles and apron in labs that need it