# FinalExam review

 Five steps of the Scientific Method: a,b,c,d,e
 a: observe b: hypothesis c: materials d: procedure e: conclusion
 difference between qualitative and quantitative
 quant: quantity
 Calculate the following: (you may use a calculator) a. (1.3 x 10-4) x (3.6 x 106) :  b. (2.3 x 104) ? (1.1 x 102) :  c. (5.6 x 109) + (1.0 x 102) :    d. (2.9 x 10-2) – (1.0 x 102) :
 a b c d
 Put the following in scientific notation.  a. 56790 b. 1,000,000 c. .0056 d. .203
 a. 5.679 * 10^4 b. 10^6 c. 5.6*10^-3 d. 2.03*10^-1
 # of sig figs? a. 23400 b. 0.987 c. 34 d. 0.00987 e. 685.990                 f. 101420
 a. 3  b. 3 c. 2 d. 3 e. 6 f. 5
 Calculate with sig figs: a. 23.500 + 78.0232 b. 0.0983 * 4532.1 c. 45.67 – 0.98 d. 450 – 25.5
 a. 101.523 b. 446 c. 45 d. 420
 Round to sig fig in ()a. 8590.3 (4) b. 0.0074 (1) c. 23.845 (4) d. 130.88 (3)
 a. 8590. b. .007 c. 23.85 d. 131
 Units and instrument for eacha. Length b. Mass c. Temp d. Volume
 a. meters– meter stick b. kg– scale c. Celcius– Thermometer d. Liters– graduated cylinder
 # of exponent to the prefix a. kilo                  b. milli c. nano                d. Mega e. centi               f. Micro
 a. 3 b. -3 c. -9 d. 6 e. -2 f. -6
 Calculate: a. 1500 km= _m b. 2.5 pg= _mg c. 539.54 nm= _Mm d. 34 m^3= _cubic cm
 Get help from Cottingham
 formula: Density
 D=m/v
 An object has mass of 25g and volume of 6.5cm^3. What’s the Density?
 25/6.5 g/cm^3
 A brick has a mass of 105.8g. It is the form of a rectangular block with the dimensions of 11.13cm, 22.25cm, and 33.54cm. What is the density?
 D=.01273
 The Density of water is known to be 1.00g/cm^3. The sample we used had a mass of 35.28g. What was the volume of the water?
 Volume=35.28g
 Convert the following:  a. 56.5C= _K  b. 210K= _C
 a. 329.5K b. -63C
 What is the law of conservation of mass?
 Mass is not created or destroyed.
 What are the three main states of matter?
 a. solid b. liquid c. gas
 Define matter
 Anything that has mass and takes up space.
 Physical or Chemical properties? a. the car is red b. the element ignited when put in water. c. The melting point is 18C d. it reacts with oxygen
 a. p b. c c. p d. c
 Physical or Chemical change? a. cutting a piece of paper b. burning gasoline c. a car rusts d. a chocolate bar melts
 a. p b. c c. c d. p
 Define element
 A pure chemical substance
 Define compound
 a pure chemical substance consisting of two or more different chemical elements that can be separated into simpler substances
 Define mixture
 When two substances are mixed but not combined chemically
 Define Pure Substance
 Stubstances are called “pure” to set them apart from mixtures.
 Define homogeneous
 same
 Define heterogeneous
 mixed
 HomoX or heteroY  a. beach sand b. salt dissolved in water c. kechup d. beef stew e. milk                  f. bowl of fruit loops
 a. X b. Y c. Y d. X e. Y f. X
 What are the four methods of separating substances physically?
 a. filtration b. exraction  c. decanting d. evaporation
 What is the law of constant composition?
 Matter is not created or destroyed
 What did dalton contribute to the atomic theory?