Classify each of the following substances as an element, a compound, or a mixture. |
Element: silver, Ag and fluorine, F Compound: carbon monoxide, CO and calcium chloride, Ca Cl2 Mixture: soft drink |
Classify the following mixtures as homogeneous or heterogeneous. |
Homogeneous mixture: stainless steel, vodka, and gasoline Heterogeneous mixture: potato salad and gravel |
A sample of wine consists of water, sugar, some amount of ethyl alcohol, and grape juice. These ingredients blend together uniformly to give clear and tasty wine. |
-mixture -homogeneous mixture -solution |
A copper foil is made from copper, absolutely free of impurities. |
-pure chemical substances -element |
A sample of beach sand contains sand particles of different colors, small pebbles, and also shells. Each component contains different metals and minerals. The pebbles and shells can easily be separated from the sand. |
-mixture -heterogeneous mixture |
A balloon is filled with pure carbon dioxide. |
-pure chemical substance -compound |
Classify the following as intensive or extensive properties of silver. |
Intensive: -begins to melt at 961.78 degrees Celsius -has a density of 10.49 g/mL -matte gray in color Extensive: -has a mas of 77.83 g -has a volume of 7.42 mL |
You are given a sample resembling silver. Which of the following properties could be used to help determine whether the sample is really silver? |
-the density of the sample -the melting point of the sample |
Which of following changes that affect the composition of our atmosphere involve physical changes and which involve chemical reactions? |
Physical Change: -water vapor forms from frost as the air temperature rises. -clouds form when water vapor in the air condenses. Chemical Reaction: -microbes decompose complex organic matter to release carbon dioxide and methane. -carbon monoxide is produced by the combustion of gasoline. -most of the ozone is created as a byproduct of human-created photochemical smog. |
In a laboratory experiment, a fermenting aqueous solution of glucose and yeast produces carbon dioxide gas and ethanol. The solution was heated by burning natural gas in a Bunsen burner to distill the ethanol that formed in the flask. During the distillation, the ethanol evaporated and then condensed in the receiving flask. The flame of the burner was kept too close to the bottom of the flask and some of the glucose decomposed into a black carbon deposit on the inside of the flask. During this experiment the following changes occurred. |
-condensation of ethanol -evaporation of ethanol |
Which of the following properties of zinc are chemical properties? |
-it burns under a flame giving off zinc oxide fumes. -it reacts with chlorine to form zinc chloride. |
Which of the following properties of a ice cube are physical properties? |
-it has a mass of 27.3 g. -it is hard. -it is cold to touch. |
Convert the number 0.000127 to scientific notation, then enter the answer using the MasteringChemistry format. |
1.27 x 10^-4 |
Use your calculator to determine the answer to the following calculation: |
-2.4 x 10^-9 |
4.3×10^−6 is between which two numbers? |
1 x 10^-5 and 1 x 10^-6 |
Which of the following are equal to 5×10^10? |
-50 x 10^9 -500 x 10^8 -0.5 x 10^11 |
How many milliliters of liquid does the smaller graduated cylinder contain? |
3.54 mL |
How many milliliters of liquid does the larger graduated cylinder contain? |
1.5 L |
If you could use only one of these graduated cylinders, which graduated cylinder would more precisely measure a given volume of liquid? |
the smaller graduated cylinder |
A particular brand of gasoline has a density of 0.737 g/mL at 25 ∘C. How many grams of this gasoline would fill a 12.7 gal tank (1US gal=3.78L)? |
3.54 x 10^4 g |
A block of metal has a width of 3.2 cm, a length of 17.1 cm, and height of 4.5 cm . Its mass is 1.3 kg . Calculate the density of the metal. |
5.3 g/cm^3 |
The average normal human body temperature is 98.6 ∘F. |
37.0 degrees Celsius |
The average normal human body temperature is 98.6 ∘F. |
310.2 K |
Rank the size of a change in temperature of one degree Fahrenheit, one degree Celsius, and one kelvin. In other words, if a thermometer were to show that the temperature outside increased by these amounts, which change would feel the largest? If any of the options are the same magnitude, stack them above one another. |
Largest to Smallest: -one kelvin and one Celsius degree (overlap) -one Fahrenheit degree |
Compute 3.5×4.48697. Round the answer appropriately. |
16 |
Compute 1240.64/12.5. Round the answer appropriately. |
99.3 |
Compute 9.3456+2140.56. Round the answer appropriately. |
2149.91 |
Compute 4659¯0−214¯00. Round the answer appropriately. |
25200 |
Determine the number of significant figures in the measurement 6.07 m? |
3 |
Determine the number of significant figures in the measurement 0.0030 s? |
2 |
Round the value 44.981 g to three significant figures. |
45.0 g |
A bakery measured the mass of a whole cake as 0.870 kg. A customer bought one slice of the cake and measured the mass of the slice as 0.1151 kg. What is the mass of the remaining cake, without the one slice? |
0.755 kg |
An unknown object is placed on a balance, which then reads 6.118 g. Its volume is measured to be 3.04 cm3. Find the density of this object by dividing mass by volume. |
2.01 g/cm^3 |
Rank the data sets in decreasing order of precision. |
Most precise to least precise: -set 1 -set 2 -set 3 |
The accepted density of the sugar solution is 1.394 g/mL . Based on the average value of each data set, rank the data sets in decreasing order of accuracy. |
Most accurate to least accurate: -set 1 -set 3 -set 2 |
The conversion factor relating miles to meters is 1mile=1610m. |
6.71 x 10^8 miles/h |
The conversion factor relating feet to meters is 1ft=0.305m. Keep in mind that when using conversion factors, you want to make sure that like units cancel leaving you with the units you need. |
1760 ft^2 |
In the course of a conversation, you observe that three of your friends like horror movies. Horror movies happen to be your favorite type of movie as well. You also know that all of these friends were born in the same week that you were, even in the same year. |
perform experiments to test your hypothesis. |
Which of the following experiments would best test your hypothesis? |
find other people born in the same week and ask them what their favorite type of movie is. |
What should you do next? |
refine your hypothesis |
You wash dishes for a chemistry laboratory to make extra money for laundry. You earn 12 dollars/hour, and each shift lasts 75 minutes. Your laundry requires 12 quarters/load. |
2 shifts |
How many loads of laundry can you wash if you work 3 shifts? |
15 loads |
How many loads of laundry will each shift pay for if the cost per load rises to 16 quarters? |
3 loads |
Mastering Chemistry- Chapter 1 Assignment
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