Density & Matter
Density is described as mass divided by this.
volume.
How do we know if a measurement is accurate?
It is the same or very close to the accepted/target value.
The second rule of Significant figures is that all zeroes to the left of the first non-zero digit is NOT significant.
If this is true, how many significant figures are in 0.0054?
Two!
The 5 and the 4 are significant because they are non-zero numbers, but the zeroes occuring before them are in front of all other non-zero digits, making them not significant.
What is the prefix with an abbreviation of k (e.g. kg)
Kilogram
How many significant figures are present in the following number:
5,000,000
One.
If there are multiple elements present like in H2O, it is called this.
compound.
The accepted weight of my dog is 50 lbs. I place him on a scale 3 times. The scale tells me he weights 45.0, 44.9, and 45.1 pounds. Are my measurements precise?
Yes (but not accurate!)
What is 3.641 x 104
36410
Which metric prefix has a scientific notation 10-1?
When reading a graduated cylinder, always read at the _____________.
Bottom of the curve / meniscus.
A block has a mass of 5.00 grams. The measured volume is 105 L, but it is a displacement volume where the original volume is 100 L. Does the block float?
Yes! It's density is 1.00 g/L
What is the four letter term used in labs for smells vapors?
waft!
The third rule is that any zeroes occuring after a decimal point are significant (or they would be omitted!)
If this is true, how many significant figures are in 185.00?
Five!
All digits to the left of the decimal are significant, and the zeroes follow a decimal place, making them significant as well!
Convert 1000 g into kg.
1 kg.
If you were to add 0.054 cm and 0.21 cm, what would be your answer in proper significant figures (according to addition rules).
0.26 cm
A plank of wood has a density of 9 g/cm3. A piece of the wood is cut off the plank. What is the density of this new piece of wood?
The same or 9 g/cm3.
The accepted density of diamond is 3.51 g/cm3 . I have a big diamond ring. I calculate the diamond's density as 1.2 g/cm3, 2.5 g/cm3, and 3.0 g/cm3. Are my measurements are precise? Are my measurement accurate?
Neither accurate or precise
What is (5.31 x 102) x (3.14 x 103)?
1.67 x 106
Convert .001 km to cm.
100 cm
When converting numbers from scientific notation to standard form, you move the decimal to the _______ if the exponent is negative.
Left. (the number gets smaller)
The term heterogeneous is used to describe a type of ___________.
Mixture.
The tip on the ______ cone is the hottest part of the bunsen burner flame.
Inner
When multiplying or dividing with significant figures, you answer should have the same amount of significant figures as the number with LEAST amount of significant figures.
Using this rule, what is the answer to 5.0 x 3.21 (with the proper amount of significant figures?
16.1
Convert 2 hectoliters into milliliters.
200,000 mL
Convert 5.21 m to mm in proper scientific notation.
5.21 x 103 mm