Measurements and Sig Fig Calculations
How many sig figs are in 600.0 K?
Four
Complete the following metric relationship:
1 mL = ? μL
1000 μL
What is density?
the comparison of the mass of an object to its volume (mass/volume)
What are the two types of mixtures and what do they mean?
Homogeneous - composition is uniform throughout sample
Heterogeneous - the components appear as two separate regions
What are the two commonly used temperature scales? How are they equal to each other?
Celsius (oC) and Fahrenheit (oF)
1 oC = 1.8oF
Do the following numbers have the same number of sig figs?
2.44 x 103 g and 0.0344 g
Yes
kL or dL
kL
If a 0.258 g sample of high-density lipoprotein (HDL) has a volume of 0.215 mL, what is the density, in grams per milliliter, of the HDL sample?
1.20 g/mL
Classify as a pure substance (element or compound) or a mixture (homogeneous or heterogeneous):
Nitrox, a combination of oxygen and nitrogen used to fill scuba tanks
homogeneous mixture
What is the absolute zero of Kelvin equal to in Celsius?
-273.15 oC
Add:
0.758 g + 3.10 g
3.86 g
Perform the following conversion:
0.72 ks to milliseconds
7.2 x 105 ms
Greg has a blood volume of 5.9 qt. If the density of blood is 1.06 g/mL, what is the mass, in grams, of Greg's blood (1 qt = 946 mL)?
5900 g of blood
Classify as a pure substance or a mixture:
baking soda (NaHCO3)
pure substance
Calculate the unknown temperature in the following:
65.3 oF = ? oC
18.5 oC
Divide:
(4.50 g)/(3.27 mL)
1.38 g/mL
A computer chip has a width of 0.75 in. What is the width in millimeters (1 in = 0.0254 m)?
19 mm
The element tungsten used in light bulb filaments has a density of 19.3 g/cm3. What is the volume, in cubic centimeters, of 250 g of tungsten?
13 cm3
Indicate whether the following describes a gas, a liquid, or a solid:
the neon atoms in a lighting display do not interact with each other
gas
Calculate the unknown temperature in the following:
-27 oC = ? K
246 K
Calculate:
(568.99 m - 232.1 m)/5.3 m
64 m
A dessert contains 137.25 g of vanilla ice cream, 84 g of fudge sauce, and 43.7 g of nuts.
What is the total weight, in pounds, of the desert (1 g = 0.0022 lb)?
0.58 lb
28.5 g of iron shot is added to a graduated cylinder containing 45.50 mL of water. The water level rises to the 49.10 mL mark. From this information, calculate the density of iron.
7.92 g/mL
Describe the following as a physical or chemical property:
Ammonia will corrode iron
chemical property
Compost can be made at home from grass clippings, kitchen scraps, and dry leaves. As microbes break down organic matter, heat is generated, and the compost can reach a temperature of 155 oF, which kills most pathogens. What is this temperature in degrees Celsius? In kelvins?
68.3 oC, 341 K