Exam 1: Introduction to Chemistry

The Study of Chemistry Which of the following items are matter and which are not? a)A flashlight b)Sunlight c)An echo d)Air at sea level e)Air at the top of Mount Everest

Describe the layers of a typical touchscreen display.

Numbers and Measurements What is the difference between a qualitative and a quantitative measurement?

Problem Solving in Chemistry and Engineering The distance between two atoms in a molecule is 148 pm. What is this distance in meters?

Numbers and Measurements The largest computers now include disk storage space measured in terabytes. How many bytes are in a terabyte? (Recall that in computer terminology, the prefix is only "close" to the value it designates in the metric system.)

Numbers and Measurements Convert the value 38.4 ppm into ppb.

Problem Solving in Chemistry and Engineering A metallic cylinder displaces 91.0 mL and has a mass of 245.7 g. What is the density of the metal?

Problem Solving in Chemistry and Engineering Carry out the following unit conversions.

Numbers and Measurements A rock is placed on a balance and its mass is determined to be 22.410 g. When the same rock is placed in a graduated cylinder that originally contains 11.34 mL of water, the new volume of water is 17.82 mL. What should the density of the rock be reported as?

Problem Solving in Chemistry and Engineering If the cost to fill a gasoline tank is $78.42 and gasoline costs $3.66\gal, how many gallons can the tank hold? How many liters of gasoline could be purchased for $50.00?(1 gallon = 3.78 liter)

Insight into Materials Selection and Bicycle Frames Rank aluminum, steel, and titanium in order of increasing stiffness.

Problem Solving in Chemistry and Engineering Use the web to determine the chemicals that are involved in the precipitation process while refining aluminum and draw a molecular scale drawing of this reaction.

Numbers and Measurements How many significant figures are present in each of the following experimental measurements? a)0.003 m b)6030 kg c)400.3 s d)0.000701 L e)31.624 km

Insight into Materials Selection and Bicycle Frames Use the web to research the elastic modulus and yield strength of carbon fiber composites. How do these materials compare to aluminum, steel and titanium?

Problem Solving in Chemistry and Engineering A load of hematite has a density of 5.3 g\cm3. If the mass of the load is 150 metric tons, how many dump trucks, each with a capacity of 15 cubic yards, will be needed to haul the whole load. Assume that the truck(s)can carry the load from the mine to the dumping zone only once.

Observations and Models Data that have a small random error may be:  (accurate, precise, both, or neither).

Observations and Models James provides Martha with two statements: "All bald men are intelligent" and "Lance is bald." Based on the statements, Martha concludes that Lance is intelligent. What type of reasoning (deductive or inductive)did Martha use to arrive at this conclusion?

The vast majority of touchscreen devices rely on a material called _____.

The Study of Chemistry Why do physical properties play a role in chemistry if they do not involve any chemical changes?

Insight into Aluminum What properties of aluminum might cause you concern if you had to use the aluminum tableware that Napoleon employed to impress his guests?