Physical Properties of Matter
Find the density of a substance with a volume of 5.87mL and mass of 21.8g.
3.71 mL/g
What is an independent variable?
The tested variable/what your changing
Is common salt (sodium chloride) a mixture or compund?
compound
How would you separate a mixture of iron fillings and sand?
Using a magnet to pull the iron fillings out
How many testing variables can you have in each trial of an experiment?
ONE!
Is common salt and water (salt water) a mixture or compund?
mixture
Air is made up of different gaseous elements and compounds that interact but do not bind to each other. So air is considered a .....
(Mixture, solution, colloid, element)
Mixture
A student is graphing the data for an experiment on plant growth over 6 weeks. On one axis, he puts the independent variable (fertilizer used) and on the other he puts the measurements (dependent variable)
On which axis, the x- or y-, would the dependent variable go?
y-axis
True or false: Mixtures cannot be separated unto other substances by physical means.
FALSE
Density of a substance is the ration of mass to volume. (D=M/V). It's mass, however, can be found by....
Volume x Density
Miss V challenged students to see which table could dissolve salt fastest in 100mL of water. They used a stopwatch to see how much time it took to dissolve using different methods. (group 1 changed temperature, group 2 stirred the solution....)
The group wanted to graph their results. What label should they put on the Y-axis (outcome variable)?
a: Time to dissolve
b: volume of water used
c: number of stirs per trial
d: tempwerature of the water
Time to dissolve (a)
All of the following are examples that a physical changes EXCEPT: (choose 2)
1) a gas produces
2)density change
3)salt dissolving in water
4) hydrogen combining with oxygen to form water
5)salt and water being separated into their own molecules
1) a gas produces
4)hydrogen combining with oxygen to form water
Red- 8g/cm
Blue-9g/cm
Orange- 12 g/cm
Yellow- 20 g/cm
A student ask to determine the density of an unknown substance. The substance is a 50/50 mixture of two colors from above. The substances density is 10.5 g/cm.
According to the density, what two colors make up the substance?
blue and orange