Key Terms
What does each letter in the formula D = m/v stand for?
D = density
m = mass
v = volume
Where should broken glass go?
In the bucket labeled sharps in the back of the room.
In the broken glass disposal bucket.
Make an observation about Mr. Benincase
Answers will vary
The mass of an object is 130g and it's volume is 390cm3. Find the density
130g/390cm3 = 0.333 g/cm3
What is Mr. Benincase's favorite video game series?
The Legend of Zelda
Which term means the amount of space that an object takes up?
Mass, Volume, Density, Independent Variable
Volume
What eyewear should be used when handling chemicals in the lab?
Goggles
What is the following an example of?
"If penguins are offered fish, crabs, and reindeer meat then they will choose the fish more often because they recognize it as a common food source."
A hypothesis
What unit of mass should be used if the density of the object is 84 g/mL?
g or grams
What can be measured using a digital scale?
Mass
Define density
The amount of matter that fills a given space
The mass of something divided by its volume.
Where is the nearest source of drinkable water?
Around the corner, at the water fountain.
Why is it best to have a control group in any experimental design?
So there is something to compare the results to
Find the density of an object with a mass of 375g that when placed in a beaker of water moves the water level up from 100mL to 475mL.
D = m/v
D= 375g/ (475-100mL)
D = 375g/375mL
D = 1g/mL
Why is your mass not the same as your weight?
Weight is dependent on the Earth's gravity.
Your weight would change in space but your mass wouldn't.
Which variable is the measured result of an experiment and is the directly influenced by the independent variables changes?
The Dependent Variable
Which door should be used as a fire exit if the alarm goes off?
Front door, near the flag/filing cabinets.
You observe a classroom with the lights off, make an inference about that classroom.
Watching a movie, in a lockdown, no class going on... etc
The density of an object is 2.14g/mL and it has a volume of 300mL. Solve for its mass.
D = m/v
2.14 = m/300mL
2.14 x 300 = 642g
What is the only thing that you can eat/drink at a lab station?
Water
All variables in an experiment should be kept _____________, except for the dependent and independent variables.
Constant, the same, equal, unchanged.
Write down three lab safety precautions relating to clothing, protective equipment, or accessories.
Tie back hair, closed toe shoes, cover arms/legs (long sleeves ideal), goggles, gloves. etc
Name a potential cause of error in the dissolving salt in water lab conducted last week.
Human error with the timers.
Waiting too long between measuring the temp of the water and adding the salt.
Stirring at different speeds for each test.
Supposed an object has a density of 1.5g/cm3
and a mass of 666g. What is its volume?
D = m/v
1.5g/cm3 = 666g/v
666/1.5 = 444cm3
Find the density of this. Show your work
1.7-2 g/mL