Significant Figures
Answer the following problem, being sure to report the answer to the correct number of significant figures. Explain your answer.
(34.4 + 2.15)/(41 x 10)
What is 9?
What is an alternate name for dimensional analysis
Unit cancellation or Factor Label Method
Tells us how many atoms of each atom make up a molecule
What is a chemical formula, specifically a molecular formula?
How many moles of sodium oxide are in 123.96 g of the compound?
1.9994 moles Na2O
A saline solution contains .90 g NaCl in 100 mL of Solution, what is the molarity of the solution?
0.15M
How many significant figures are in 2539.0920? Explain your answer
What is 8? Non-zero digits are significant, trapped zeros are significant and trailing zeros are significant when they are to the right of a decimal point.
1.5 km/day converted to m/min
what is 1.04 m/min
This is the mass reported on the periodic table for each element.
What is average atomic mass?
What is the mass of 2.15 mole NaCl?
124.7 g
When diluted, the total number of moles of solute _____ regardless of the amount of solvent used.
stays the same
Express 9.002 x 10-2 in decimal form.
What is 0.09002?
Is it reasonable for a new born human baby to be 1500 mm in length? Explain your answer.
No, this is 1.5 meters which is almost 5 feet.
The three major classes of elements
What are metals, non-metals and metalloids?
One mole of any stubstance has mass in grams equal to its
molar mass
A solution has a volume of 2 L and contains 36 g of glucose. if the molar mass of glucose is 180g/mol, what is the molarity of the solution.
0.10M
Conversion factors and other defined values have this many significant figures.
What is an infinite amount?
Convert 2.34 L to mL
What is 2340 mL?
Conducted the gold foil experiment determining that atoms contain a small dense region called the nucleus.
Who is Rutherford?
True or False
One mole of iron has more atoms than one mole of copper.
Explain your answer.
False, the mole is a defined value, like a dozen.
mass solute divided by mass solution x 100
What is mass/mass %?
What is the sum of the following problem in scientific notation?
1.4879 x 103 - 5.3368 x 102
Explain how to solve this problem without using a calculator.
9.542 x 102
What is the length of one side of a cube with volume 1.0 L?
1 dm
Salt is a term used to describe what class of compounds?
Ionic compounds
True or False
One mole and one mole of silver have the same mass
False
1 part out of 109 parts
What is ppb?