Chem 1302 Final Review (Chapters 1-3)
In order, what is the freezing point, room temperature and boiling point of water according to the Celsius scale?
0-25-100
The correct decimal representation of 1.2010 × 10-7 is
0.00000012010
How many liters are in 333 mL?
0.333
How much heat (J) is needed to raise the temperature of 10.0 grams of water from 25.0°C to ? The specific heat of water is 4.18 J/g °C. Show all your work for calculating the heat needed on the same piece of notebook paper in handwriting. Be sure you give equation used, significant figures and units in work and answer.
1050
How many significant digits should be reported in the answer to the following calculation? (5.3 - 0.7) × 12.3 =
2
How many calories are there in a 255 Calorie snack bar?
2.55 x 10^5
When propane is burned with oxygen, the products are carbon dioxide and water. If you produce 36 grams of water and 66 grams of carbon dioxide from 80 grams of oxygen, how many grams of propane were needed for the reaction?
22
The distance from New York City to Washington, DC is approximately 235 miles. Identify the correct solution map to convert from miles to kilometers using the prefix multipliers and the given conversion factors: 1 mile = 5280 ft; 1 ft = 12 in; 1 in = 2.54 cm.
235 mile x 5280 ft/1 mile x 12 in/1 ft x 2.54 cm/1 in x 1 m/100 cm x 1 km/1000 m
Convert 78 °F to Kelvins. You must show all work to get any credit for this problem. Use both of these formulas: K = °C + 273.15 °C = ( °F -32) / 1.8 Show all work including the equation used, numbers substituted into equation and give answers for both calculations with units. Be sure to upload all your handwritten work for these last three problems into the separate assignment "Work for Exam I".
298
The correct number of significant figures in the number 0.006890 is
4
The correct scientific notation for the number 500.0 is:
5.000 x 10^2
Which among the following statements is false?
A gas has neither definite volume nor definite shape, Both solids and liquids are incompressible while gases are compressible, A liquid has a definite volume; but it has no definite shape, A solid has a definite shape and a definite volume, (NONE OF THESE STATEMENTS ARE FALSE)
Which of the following items does NOT contain chemicals?
All of the above contain chemicals
Who is credited with one of first atomic theories? He explained the Law of Conservation of Mass with his theory by proposing that all matter was composed of small, indestructible particles called atoms
John Dalton
The base SI unit for temperature is
Kelvin
Which of the following statements about matter is FALSE?
Matter is smooth and continuous.
Suppose a boat engine leaks 868 milliliters of oil into a lake. The mass of this spilled oil is The oil will not mix with the lake water. Which statement is true? Show all your work for calculating the density of the oil on notebook paper in handwriting. Be sure you show equation used, significant figures and units in work. This work must be uploaded to get full credit for this question.
The oil will float because its density of 0.877 g/mL is less than the density of water.
A sample of wood with a mass of 3.0 grams was burned in an open dish. The ashes weighed 1.2 grams. What happened to the rest of the wood?
The remaining 1.8 grams was converted into gaseous compounds
Which statement about the scientific method is TRUE?
The scientific method emphasizes observation and experimentation as the way to understand the world.
Which of the following is an example of an observation?
When a can of soda pop is opened, a fizzing sound is heard
The definition of a scientific law is
a number of similar observations generalized into a brief statement summarizing past observations and predicting new ones
Mixtures can be separated by physical changes. Which of the following is not one such method of separation?
all are methods of separating mixtures by physical means
A pure substance is
composed of only one type of atom or molecule such as an element or compound.
A solid form of matter in which there is long range repeating order is called ________. We discussed table salt as an example of this type of solid.
crystalline
Early scientists such as Lavoisier and Dalton saw patterns in a series of related measurements made by researchers. These sets of measurements constitute scientific __________ and are often used to build graphs for easier analysis and interpretation
data
The reaction described in Question #24 above is an example of an __________________.
exothermic reaction.
The basic SI unit for length is
meter
How would you classify sugar water?
mixture-homogeneous
The correct prefix for the multiplier 1,000 is:
none of these
the sun, our closest star, is moving away from the Earth at a high rate of speed. This is an example of a(n)
observation
Which of the statements below is NOT part of scientific method
observation and measurement, formation of a hypothesis, testing of a hypothesis by experimentation, refinement of a hypothesis as needed are ALL part of the scientific method
Which of the following is a heterogenous mixture?
raisin bran
What term best describes a brief statement that summarizes a large number of past observations and predicts new ones
scientific law
Which of the following statements about soda pop is FALSE
the carbon dioxide is forced to mix with the water by the presence of sugars
A good definition of chemistry is
the science that seeks to understand what matter does by studying what atoms and molecules do
Which of the following items is a chemical change?
the tarnishing of a copper statue