Show:
Sig Figs + Scientific Notation
Dimensional Analysis
Periodic Table
Classification of Matter
Measurements
100
How many sig figs are there in the following numbers: 1) 80000 2) 0.08000 3) 15.02
1) 1 2) 4 3) 4
100
Convert 803 nm to km with proper sig fig and scientific notation.
8.03*10^-10 km
100
Name a halogen
Ex: Chlorine.
100
True or False: Carbon dioxide is an element.
False: It is a compound.
100
Which is more precise? 800 mL or 820 mL?
820 mL
200
Rewrite 801.800 in proper sig fig and scientific notation.
8.01800*10^2
200
Convert 1020 m^2 to cm^2 with proper sig fig and scientific notation.
1.020*10^7 cm^2.
200
What is the main property of the noble gases?
They are inert (don't react)
200
Which can you separate physically? Mixture or compound.
Mixture
200
How do you read a meniscus?
At the bottom of the meniscus.
300
What is 16.0*5.0 in correct sig fig?
80. or 8.0*10^1
300
Convert 380 m/s to km / hr with proper sig fig and scientific notation.
1400 km/hr
300
Which of the following elements have an explosive reaction with water and why? Sodium, Rubidium, Nitrogen, Oxygen, Potassium, Aluminum
Sodium, Rubidium, Potassium. Because they are alkaline metals.
300
Chocolate milk is an example of __________.
Homogenous mixture.
300
What is parallax and how do we avoid it?
Error produce by looking at an angle. Read it at eye level.
400
What is 16.8 - 17 in proper sig fig?
0
400
A student told me that the density of an unknown object is 80 L / g. What is wrong with this answer?
Her unit is wrong.
400
Name the 7 diatomic elements:
Iodine, Bromine, Chlorine, Fluorine, Oxygen, Nitrogen, Hydrogen.
400
H20 is an example of a ____________. Is O2 an example of this too?
Compound. It is not an example of a compound because it is a diatomic element.
400
A meter stick has for its smallest mark 1 cm. Which of the following is the most correct reading it can give? A) 1.0 m. B) 1.00 m C) 1.005 m D) 1 m
C. It is one half of the smallest measurement mark.
500
(18.5 - 2)*5.5 = ? with correct sig fig.
18.5 - 2 = 16.5 which is about 17 due to subtraction rule. 17 * 5.5 = 93.5 which is about 94 due to multiplication rule.
500
A student is asked to measure the density of a 45.0 cm by 55.0 cm by 55.0 cm cube. If the mass of the object is 8.00 *10^3 g, what is its density in kg / m^3?
58.8 kg / m^3
500
Which isotope is more abundant, Carbon-12 or Carbon-13 and why?
Carbon-12 because the atomic mass is very close to 12 amu.
500
What are the two types of mixtures? Provide examples of each.
Heterogenus and homogenus mixtures. Ex: Water and sand, sugar and water.
500
You measured a volume of 81 ml and a mass of 80.5g. What is the density of the object in correct sig figs and units?
0.99 g / ml