lab
Given the data you collected for the volume of water displaced by 30 g of iron, what is the density of iron? Choose the closest answer.
. 7.9 g/cm3
Given the data you collected for the volume of water displaced by 30 g of aluminum, what volume of water do you expect 50.000 g of aluminum will displace? Choose the closest answer
18.5 mL
EXPERIMENT 2: What volume does the air occupy in the empty Erlenmeyer flask?
182 mL
Given the data you collected for the volume of water displaced by 45 g of aluminum, what is the density of aluminum? Choose the closest answer
2.7 g/cm3
What was the original volume of water before adding iron? Choose the closest answer.
20.0 mL
What was the mass of 20.00 mL of unknown liquid? Choose the closest answer.
22.200 g
How much water was displaced when you added 30 g of unknown metal? Choose the closest answer.
4.2 mL
What was the mass of the ethanol plus the graduated cylinder when 20.00 mL of ethanol was added? Choose the closest answer.
90.780 g
EXPERIMENT 3: What happened to the hydrochloric acid solution when zinc was added?
Bubbles formed.
Why is density referred to as a characteristic property of matter?
Density can be used to identify the type of matter.
Where are the substances required to perform the experiments located?
The Materials shelf
Below is a graph of mass versus volume for iron. The density of iron is equal to the slope of the graph.Is the graph consistent with what you know about density?
Yes. The density is constant, therefore as the mass increases, the volume increases.
EXPERIMENT 1: what container apperared to have the least volume of liquid despite all three holding the same volume
beaker
what container is the most precise for measuring the volume of a liquid
graduated cylinder
Which metal in the table below is most likely your unknown metal? Metal Density (g/cm3) zinc 7.13 tin 7.28 copper 8.96 silver 10.49 lead 11.36
zinc
Given the data you collected for the addition of 10.00 mL of ethanol to the graduated cylinder, what is the density of ethanol? Choose the closest answer.
0.789 g/cm3
How much water did 15 g of iron displace? Choose the closest answer.
1.9 mL
EXPERIMENT 1: What was the initial temperature displayed on the thermometer before adding the NaOH to the HCl?
21.5 ºC
What was the total volume of substances in the graduated cylinder after the addition of 15 g of unknown metal? Choose the closest answer.
22.1 mL
What was the mass of 30.00 mL of ethanol? Choose the closest answer.
23.670 g
What was the total volume of substances in the graduated cylinder after you added 30 g of iron? Choose the closest answer.
23.8 mL
EXPERIMENT 3: What is the change in mass of the system after the addition of the 25 g of zinc?
24.395 g
What was the total volume of substances in the graduated cylinder after you added 15, 30, and 45 g of aluminum? Choose the closest answer.
25.5 mL, 31.1 mL, 36.7 mL
EXPERIMENT 1: What was the highest temperature displayed after the addition of NaOH? Choose the closest answer.
26.7 ºC
EXPERIMENT 1: what is the maximum number of significant figures that the graduated cylinder can be reported to?
3
EXPERIMENT 1: to how many significant figures can you report your measurement of the mass of a liquid ?
5
EXPERIMENT 3: to how many significant figures can you report your measurement of the mass of the NaCI sample?
5
EXPERIMENT 1: What was the difference between the final (after the addition of NaOH) and initial temperature in the flask?
5.2 ºC
How much water did 15 g of aluminum displace? Choose the closest answer
5.5 mL
EXPERIMENT 3: what was the mass of the aluminum sample. Choose the closest value
54.110 g
When instructed to record observations, data, or notes, where should you record the information?
In a notebook or other document to reference later when completing the assignment.
Given the data you collected for the volume of water displaced by 45 g of unknown metal, what is the density of the unknown metal? Choose the value closest to your result.
7.3 g/cm3
What was the mass of the empty graduated cylinder? Choose the mass that is closest to the observed value.
75.000 g
Experiment 1: You measured the mass of three different volumes of water. What was the total mass of the graduated cylinder and the water for the three measurements? Choose the masses that are closest to the observed values.
85.000 g, 95.000 g, 105.000 g
You measured the mass of three different volumes of unknown liquid. What was the total mass of the graduated cylinder and the unknown liquid for the three measurements? Choose the masses that are closest to the observed values.
86.100 g, 97.200 g, 108.300 g
EXPERIMENT 3: What is the maximum temperature reached when you combine 25 grams of zinc (Zn) with hydrochloric acid (HCl)? Choose the closest answer.
87.1 °C
What was the initial mass of the graduated cylinder with the 20 mL of water? Choose the closest answer.
95.000 g
In order to place something into a container you must
click on the material or instrument and drag it onto the container.
Given the data you collected for the addition of 30.00 mL of unknown liquid to the graduated cylinder, what is the density of the unknown liquid? Choose the closest answer.
1.110 g/mL
EXPERIMENT 2: What was the pressure in the Erlenmeyer flask after the addition of 40 mL of water?
1.282 atm
Given the data you collected for the addition of 20.00 mL of water to the graduated cylinder, what is the density of water? Choose the closest answer.
1.000 g/mL
You measured the mass of three different volumes of ethanol. What was the total volume of ethanol used for each of the three mass measurements? Choose the closest answer.
10.00 mL, 20.00 mL, 30.00 mL
You measured the mass of three different volumes of unknown liquid. What was the total volume of unknown liquid used for each of the three mass measurements? Note: Depending on the actual amount of liquid dispensed in the lab, there is a range of possible answers. Pick the values that are closest to yours.
10.00 mL, 20.00 mL, 30.00 mL
What was the mass of the first 10.00 mL of water added? Choose the closest answer.
10.000 g
EXPERIMENT 2: what was the mass of the empty beaker? choose the closest answer
110.000g
Why do you think you were required to take three measurements for each experiment instead of just one?
Taking three measurements minimizes the contribution of experimental error.
What is the main advantage of using the water displacement method to measure the volume of a metal versus using the length measurements?
Water displacement can be used for irregularly shaped metals such as lumps.
Which liquid in the table below is most likely your unknown liquid? Substance Density (g/mL) ethyl acetate 0.897 ethylene glycol 1.110 glycerol 1.261 mercury 13.594 methanol 0.7928
ethylene glycol
Where are the lab supplies located in the lab?
on the shelf above the workbench
