Separation
What method separates an undissolved solid from a liquid using filter paper?
Filtration
What is an element?
A pure substance made of one type of atom. The purest form of matter.
What is the chemical symbol for sodium?
Na
What is the SI base unit commonly used for mass in this course?
Gram (g)
What is the formula for density?
D = M/v
What method boils a solution and recondenses vapor to separate liquids with different boiling points?
Distillation.
Is rusting a physical or chemical change?
chemical
What is a compound?
A substance containing two or more different elements chemically combined.
What is the independent variable, and where is it usually graphed?
The variable the experimenter changes; it is usually graphed on the x-axis.
Find density for 43.2 g and 96.5 mL.
What separation technique is more PRECISE, evaporation or distillation? WHY!
Distillation! It collects all parts of the mixture!
What is an intensive physical property?
A property that does not depend on the amount of substance.
How many nitrogen atoms are in Al(CN)3?
3
To what decimal do you read a 10 mL graduated cylinder?
the 100ths place
If you are given the mass and the density, what does the formula look like to get the volume?
V=M/D
What does chromatography separate particles by?
Differences in particle size and solubility.
Is a change that changes a substance’s composition physical or chemical?
Chemical!
How many oxygen atoms are in Fe2(SO4)3?
12
Convert 0.0068 km to meters.
6.8 m
How many significant figures are in 0.0204?
3
Red, yellow, and blue
Is mass an extensive or intensive property? Why?
Extensive; it depends on the amount of matter.
Which elements are in C6H12O6, and how many atoms of each are present?
Carbon - 6, Hydrogen - 12, and Oxygen - 6
Find percent error for measured 2.85 g/cm3 and accepted 2.699 g/cm3 .
Find density for 709 g and 490 mL, to two significant figures.
1.4 g/mL