Scientific Notation/Temperature Conversions
Express this number in scientific notation: 123,000
1.23 x 105
How many significant figures are in the number 1201.0101
8
Convert 76.8 cm to m
0.768 m
Observation or Hypothesis?
A patient breaks out in hives after receiving penicillin
Observation
Express the number 0.000042 in scientific notation
4.2 x 10-5
How many significant figures are in the number 0.00620?
3 significant figures
Convert 2855 mg to kg
2.855 x 10-3 kg
Observation or Hypothesis?
Dinosaurs became extinct when a large meteorite struck Earth and caused a huge dust cloud that severely decreased the amount of light reaching Earth
Hypothesis
Convert 16 °C to K
289.15 K
Perform this addition to the correct number of significant figures:
8.32 + 12.148 + 0.02
20.49
Convert 876.9 in3 to m3
0.01437 m3
Which change is a chemical change?
A. The condensation of dew on a cold night
B. A forest fire
C. The smoothening of rocks by ocean waves
D. None of the above
a forest fire
Convert 39.2 °C to °F
102.6 °F
Perform this multiplication to the correct number of significant figures:
65.2 x 0.0015 x 12.02
1.2
Convert 27 m/s to km/hr
97.2 km/hr
Fill in the blanks:
Solids have a _____ shape and _____ volume
Liquids have a _____ volume and ______________ of the container
Solids have a definite shape and definite volume
Liquids have a definite volume and take the shape of the container
Convert 100 °F to K
310.93 K
Perform this calculation to the correct number of significant figures:
78.222 x (12.02-11.52)
39
A cube measures 2.5 cm on each edge and has a mass of 66.9 g. Calculate the density of the material that composes the cube. (The volume of a cube is equal to the edge length cubed.)
4.3 g/cm3
How much heat must be absorbed by 125 g of ethanol to change its temperature from 21.5 °C to 34.8 °C? (the specific heat of ethanol is 2.42 J/g°C)
4.02 kJ or 4020 J