Significant Figures
Significant Figures:Math
Density
Experimental Design
Bunsen & Graphing
100
How many significant figures?
3
100
Give number and amount of sig figs and round as necessary
8 * 2.5=
14, rounded to 10 (1 sig fig)
100
Rank these objects in density, most to least:
Plastic cube
Brass cube
Wood cube
brass, plastic, wood
100
When we create an experiment, we come up with a claim, find evidence in our data collection, and then do _______ to put it all together.
Reasoning
100
The T in DTAILS stands for what?
Title!
It should go "The effect of Independent Variable X on Dependent Variable Y"
200
How many significant figures?
809
3
200
Give number and amount of sig figs and round as necessary
27.5/5=
5.5, rounded to 6 (1 sig fig)
200
When finding the density of an object, you need its volume and what else?
It's mass from the scale, in grams.
200
This formula lets you compare your experimental data to the theoretical numbers. It is called what?
(("Theoretical" - "Experimental")/"Theoretical") x 100
Percent error
200
The Axis need to have a scale that fits the data.
If you had this as your data, what would your Scale be? (How many would each mark be worth?)
24, 35, 48, 90
By 10's or maybe by 5's. Both are acceptable depending on graph size
300
How many significant figures?
0.0067
2
300
Give number and amount of sig figs and round as necessary
24+15=
39, 2 sig figs so we don't have to round.
300
To get the double points, you MUST have the correct reason why. Other teams can steal the why!
An aluminum cube and aluminum rod are added to our density lab. What will they have the same density as? Why?
The aluminum shot, because density is size/shape independent. It doesn't matter what shape or size it is.
300
This variable is changed on purpose by the scientist.
Independent variable
300
These are the three types of flames from a bunsen burner.
Safety, normal, inner
400
How many significant figures?
0.05020
4
400
Give number and amount of sig figs and round as necessary
832-29.5
802.5, rounded to 802 (3 sf)
400
Experimental density is...
The density of an item based on its observed/measured properties like mass from a scale and volume using rulers and math.
400
The variable of the "results". It depends on the independent variable.
Dependent variable
400
To get the double points, you MUST have the correct reason why. Other teams can steal the why!
The x axis is always this variable, and the y is always this variable.
X is independent
y is dependent
This is because the y is almost always a number, where the x might be a number OR a descriptor.
500
500 Challenge!
Ashlyn is reviewing her lab partner's work for accuracy. She looks at the following beaker and writes down 63.82 mL with 3 significant figures. Is she correct? How do you know?
You must both answer in terms of her measurement AND the sig figs.
She isn't correct in either, as there are only markers to the 10th's place, meaning we can only guess-timate to the 1's place: "63" would be as accurate as we could get, and that only has 2 sig figs.
*Also, the original number has 4 sig figs.
500
500 Challenge!
A scientist in a laboratory started with 650 milliliters of a chemical solution. During an experiment, 287.9 milliliters of the solution were used.
How much of the solution remains?
362.1 rounded down to 360 (2 sig figs in 650)
500
500 Challenge!
Bob is on Forged in Fire, a show where contestants have to make steel knives out of random steel things. Bob knows he's going to need at least 500g worth of steel, but all he has is a large beaker and 3 handfuls of old stainless steel silverware. How could he figure out how much of the silverware to use?
(Hint: The steel's density is 8.0 g/mL)
62.5 mL of stainless steel, round to 63 mL.
500
500 Challenge!
A lab group is tasked with designing an experiment and coming up with their variables. If they want to figure out the best temperature to BBQ chicken wings the fastest, what would they do? Make a simplified procedure, list the independent, dependent, and controlled variables.
Controls: Size of chicken wings, starting temperature of wings, how long the BBQ stays open, the quality of the wings...
Independent: The temperature the BBQ is set at
Dependent: How long it takes the chicken to get to 165*
Procedure:
1. Preheat BBQ to desired temperature.
2. Remove Test 1 chicken from fridge.
3. Put chicken on BBQ, check every 5 minutes until middle of wing measures 165*F on all wings.
4. Record how long it took, repeat for Tests 2-4.
500
500 Challenge!
Graph the following data on the whiteboard. The experiment tested weight of beads against volume (water displacement measured)
g mL
12 0.20
24 0.68
36 1.25
72 4.07
DO the graph, has full D-TAILS