Sig Figs
How many sig figs are in the number 12.49?
4
A property that can be observed with just your senses is called a....
Physical Property
What is a conversion factor?
Something used to convert one set of units to another.
What is the equation for density?
D= m / v
What is the formula for % error?
(actual-expected)/expected x 100%
An element
What does it mean to be accurate
Close to the target value
How many sig figs are in the number 102,490?
A property that can be determined only by changing the chemical composition of the substance
Chemical Property
1 stone = 14 pounds
How many pounds does something weigh if it weighs 3 stone?
42 lbs
What is the formula for when the density formula is rearranged to find volume?
v= m / D
What does % error mean as a concept?
How far away the actual value is from what was expected.
Sodium chloride is an example of what?
A compound.
What does it mean to be precise
Targets are close together
What limits the amount of significant figures your answer will have when you are adding and subtracting?
The answer should limit its answer to the amount of decimal places from the addends or subtrahends that had the least amount of decimal places.
What is a physical property that depends on the amount of matter present called?
An extensive property
How many mL are in 3 kiloliters?
K H D b d c m
3,000,000 mL
What is the formula for when the density formula is rearranged to find mass?
m = D x v
What does the sign for percent error tell you? Does it matter in the grand scheme of percent error?
If you have more or less product than expected. No generally we are just concerned with how much error there is.
Heterogenous mixture
As far as volume and shape goes how would you describe a solid?
definite shape and volume
With significant figures in consideration, what is the answer to 4.29 + 3.6?
7.9
Name 3 signs of a chemical change
Bubbles, precipitate, temperature change, emission of light, odor change
How many seconds are in one year?
31,536,000
What is the density of a substance if it has a mass of 25.6 grams and a volume of 32.0 liters?
.8 g/L
If someone expected to get 3.45 grams of product but ended up getting 2.34 grams of product then what would the percent error be?
32%
Homogenous mixture
What technique is used to separate sand from water?
Filtration
With significant figures in consideration, what is the answer to 103.0 x 59,000?
6,100,000
Give an example of 2 chemical properties and 2 physical properties.
Answers will vary
What is dimensional analysis?
The process we use of converting one unit to another.
A book has a height of 4.5cm a width of 2.0cm and a length of 10.3 cm. What is its mass if it has a density of 1.62 g/cm3
150.174 grams
What would it mean if you have 100% error?
You either have no product or double the expected product.
Name a heterogenous mixture and a homogenous mixture
Answers will vary
What does the law of definite proportions state?
Chemicals will have the same composition regardless of amount