Scientific Method
Mass
Volume
Density
Potpourri
100
Which variable do "I" change?
Independent variable
100
What is the metric unit of mass we use most in class?
grams
100
What is the metric system measure for volume we use most frequently in class?
mL
100
What is the formula for density?
Density = mass/volume
100
"All my measurements are very close to one another" What are my measurements?
Precise
200
What makes an experiment "controlled"
Only 1 variable is changed
200
What do you use to measure mass?
scale
200
What is the tool called that we use to measure volume?
graduated cylinder
200
In word form, what does density actually measure?
How much stuff there is in a given area
200
"My measurement has 85% error." What can I say about my data?
It is NOT accurate
300
What does objective evidence lack?
bias or opinion
300
What does mass measure?
the amount of matter in a substance
300
What is volume a measure of?
The amount of space a substance takes up
300
Will aluminum, with a density of 2.6, float or sink in water? Why?
Water has a density of 1, so aluminum with a density of 2.6 will sink.
300
I measure a substance to have a mass of 0.0240 g. How many significant figures does this have, and which number is my estimated value?
3 sig figs, the last 0 is estimated
400
Name one qualitative and one quantitative observation about this chemistry lab.
quantitative - measurement or count qualitative - some quality
400
When massing an object, what does "zero-ing" the scale do?
ignores the mass of the container you are measuring your object in.
400
How do you measure liquids when in glassware?
to the bottom of the miniscus
400
Here are the measurements you get for an object: mass = 8.29g volume = 13mL What is it's Density?
0.64g/mL
400
My measured value for volume is 12.5 mL, but my actual value for volume was 15 mL. What % error does my measurement have?
17% error
500
What makes evidence reliable?
the same evidence observed during repeated trials.
500
Why would the same exact number of pennies and nickels not have the same mass?
They have different sizes and are made of different elements/materials, so they have different densities.
500
How do I determine the volume of an object that is irregular in shape?
water displacement
500
This is what you know about an object: density = 0.162g/mL volume = 10mL How much mass does your object have?
1.62g
500
You have graphed the mass and volume of soda. What would the slope of the line give you?
Density
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