Energy and Changes of State
Convert to the following energy units:
a. 3500 cal to kcal
b. 4.5 kJ to cal
What is...
a. 3.5 kcal
b. 1100 cal
A dessert contains 137.25 g of vanilla ice cream, 84 g of fudge sauce, and 43.7 g of nuts.
a. what is the total mass, in grams, of the dessert?
b. what is the total weight, in pounds, of the dessert?
What is...
a. 265 g
b. 0.584 lb
10
Put this in scientific notation and state the number of sig figs.
What is 1 X 10^1
1 sig fig
Color
What is a physical property
1 m in cm
For dinner, Charles had one cup of clam chowder, which contains 16 g of carbohydrates, 12 g of fat, and 9 g of protein. How much energy, in kilocalories and kilojoules, is in the clam chowder?
What is...
210 kcal
880 kJ
LDL is sometimes called "bad cholesterol," is also measured in a routine blood test. If a 0.380 g sample of LDL has a volume of 0.362 mL, what is the density, in grams per milliliter, of the LDL sample?
What is 1.05 g/mL
.002310
Put this in scientific notation and state the number of sig figs.
What is 2.310 X 10^-3
4 sig figs
Rusting
What is a chemical property
Measured or exact?
0.107 L
4 knives
What is...
measured
exact
In a freezer, 125 g of water at 0oC is placed in an ice cube tray. How much heat, in kilojoules, must be removed to form ice cubes at 0oC?
What is 41.8kJ
Butter has a specific gravity of 0.86. What is the mass, in grams, of 2.15 L of butter?
What is 1800g
7.56 x 10^4
What is this not in scientific notation and how may sig figs?
What is 75600
3 sig figs
Burning wood
What is a chemical change
identify the measured and/or exact parts...
1L=1000mL
What is... 1L and 1000mL are both exact
How many kilojoules are released when 75.0 g of steam at 100oC condenses, cools to 0oC, and freezes at 0oC?
What is... 226 kJ
In the process of making ice cream, rock salt is added to crushed ice to chill the ice cream mixture. If the temperature drops to -11oC, what is it in degrees Fahrenheit? In Kelvin?
What is 12oF
262 K
67.89 + 8565.6
Solve this, place it in scientific notation, and state the number of sig figs
What is... 8633.5
8.6335 x 103
5 sig figs
Condensing water vapor
What is a physical change
Identify the measured and/or exact parts...
1 L=1.06 qt
1 L is exact number
1.06 qt is measured number
What is the specific heat if 24.8 g of a metal absorbs 275 J of energy and the temperature rises from 20.2oC to 24.5oC?
What is 2.6 J/goC
A mouthwash is 21.6% ethanol by mass. If each bottle contains 0.358 pt of mouthwash with a density of 0.876 g/mL, how many grams of ethanol are in 180 bottles of the mouthwash?
26,700 g
321.75 X .347
solve this, place it in scientific notation, and state the number of sig figs.
What is 112
1.12 x 102
3 sig figs
Intensive property
What is a property that does not depend on the amount of matter
Steve has been diagnosed with diminished thyroid function. His doctor prescribes a dosage of 0.150 mg of Synthroid to be taken once a day. If tablets in stock contain 75 mcg of Synthroid, how many tablets are required to provide the prescribed medication?
What is...
2 tablets.