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CHEM 104 SBCC NEW EXAM QUESTIONS AND 100%
CORRECT ANSWERS LATEST UPDATE
Identify each of the following as an observation, a hypothesis, an experiment, or a theory: A. During your visit to the gym, your trainer records that you ran for 25 minutes on the treadmill. B. Scientific studies shows that exercising lowers blood pressure. C. Your doctor thinks that your weight loss is due to increased exercise. A. Observation B. Theory C. Hypothesis
Classify each of the following as an observation, a hypothesis, an experiment, or a conclusion: a. Drinking coffee in the evening makes me stay awake. b. If I don't drink coffee in the afternoon, then I sleep at night. c. I will only drink coffee in the morning a. Observation b. Hypothesis c. Experiment
Which of the following most closely resembles a scientific theory? a. For a sample of oxygen gas, if the pressure is increased by 10%, the volume of the gas decreases by 10%. b. The volume of a gas is inversely proportional to its pressure. c. A gas is composed of small particles that are constantly in motion. d. A sample of a gas has a mass of 15.8 g and a volume of 10.5 L. c. A gas is made up of small particles that are constantly in motion.
Which of the following statements best describes the purpose of experiments? a. Experiments are a means of obtaining the results that a theory predicts. b. Experiments may be replaced by a mere logical reasoning of known facts. c. Experiments are designed to obtain results which cannot be explained.
d. Experiments search for other observable predictions of a theory. d. Experiments search for other observable predictions of a theory.
Which of the following is an example of an observation? a. Energy can be converted from one form to another, but the total amount of energy is always conserved. b. Gases are composed of molecules in constant random motion. c. Wood burns producing flame, heat, smoke, and ash. d. A pure compound will always contain a definite or constant proportion of elements by mass. e. None of the above c. The burning of wood results in a flame, heat, smoke, and ash.
Which of the following is an experiment (E)? a. Eating salsa gives me heartburn. b. If I stop eating salsa, my heartburn will go away. c. I will stop eating salsa for 10 days, then eat salsa twice a day for the next 10 days and record each time I get heartburn in a journal. c. I will stop eating salsa for 10 days, then eat salsa twice a day for the next 10 days and record each time I get heartburn in a journal.
Which of the following statements is NOT a step of the scientific method? a. make an observation and measurement b. formulate a hypothesis c. test hypothesis by experimentation d. refine hypothesis if necessary e. All of the above steps are part of the scientific method. e. All of the above steps are part of the scientific method.
Which is the FALSE statement from among the following? a. The scientific method is one way of learning in which knowledge is acquired by using observations and experimentation. b. An observation is an educated guess. c. A hypothesis is a tentative explanation of a series of observations. d. A scientific law synthesizes past observations and predicts future ones. b. An observation is an educated guess.
When two positive numbers or two negative numbers are multiplied or divided, the answer is positive (+).Ex. a. 2x3= b. (-2)x(-3)= c. 6/3= d. (-6)/(-3)= a. + b.+ c. 2 d. 2
When a positive number and a negative number are multiplied or divided, the answer is negative (-).Ex. a. 2x(-3)= b. (-2)x3= c. 6/(-3)= d. (-6)/3= a. - b. -
c. - d. -
To find a percentage, divide the parts by the total (whole) and multiply by 100%.Ex: a. If the percent of red balls is 5, then for every 100 balls there are 5 red balls. b. A 150 gram gold nugget contains 2.5 grams of gold. What is the percent of gold in the nugget? a. 5 red balls/100 balls x 100%= 5% of red balls b. 2.5 grams of gold/150 gram gold nugget x 100%=1.
Converting numbers to scientific notation a. 5983 b. 0. a. 5.983 x 10^ b. 3.4 x 10^-
The 2010 U.S. population was estimated to be 308,255,000 people. Express this number in scientific notation. 308,255,000=3.08255 x 10^8 people
Express each number in scientific notation. a. 36,756,000 (Population of California)
Which of the following numbers is the largest? a. 4.3 x 10^-3 cm b. 1.5 x 10^-4 cm c. 2.0 x 10^-5 cm d. 2.0 x 10^-6 cm a. 4.3 x 10^-3 cm
What are the steps of the scientific method? observation, hypothesis, experiment, scientific law, theory
What is the scientific method? a set of general principals that helps to describe how a scientist thinks
what are chemicals? substances that have the same composition and properties wherever found
What is chemistry? the study of the composition, structure, properties and reactions of matter
The unit system for science measurements, based on the metric system, is called the International System of units (Système International d'unités) or SI units
What is the correct unit for mass in the metric system?
A. Pound B. Kilogram C. Gram D. milligram C. Gram
Which of the following units is NOT used as a standard SI unit? A. meter (m) B. liter (L) C. kelvin (K) D. seconds (s) B. liter (L)
Identify the SI units for each of the following: A. The SI unit for volume B. The SI unit for mass C. The SI unit for length D. The SI unit for temperature a.cubic meter, m b.kilogram, kg c.meter, m kelvin, K
Identify the numbers below as measured or exact, and give the number of significant figures in each measured number.
e. f.
How many significant figures are in each measured quantity? a. 0.001125m b. 0.1125 m c. 1.12500 x 104 m d. 11200 m e. 13001 kg f. 13100 kg a. b. c. d. e. f.
Perform each calculation to the correct number of Significant figures. a. 1.01 ×0.12 ×53.51 ÷ b. 56.55 ×0.920 ÷34. a. 1.01 ×0.12 ×53.51 ÷96 = 0.067556 = 0. b. 56.55 ×0.920 ÷34.2585 = 1.51863 = 1.
Perform each calculation to the correct number of significant figures. a. 4.5 x 0.03060 x 0.391 = b. 5.55 ÷ 8.97= c. 67.8 x 9.8 ÷ 100.04 = d. 89.3 x 77.0 x 0. e. 453 ÷ 2.031 = a.0. b.0. c.6. d.6 x 102 e.
Perform the calculations to the correct number of significant figures.
Perform each calculation to the correct number of significant figures. a. 87.6 + 9.888 + 2.3 + 10.77 = b. 43.7 -2.341 = c. 89.6 + 98.33 -4.674 = d. 6.99 -5.772 = e. 0.00456 + 1.0936 = f. 8475.45 -34.899 = a. 110. b. 41. c.183. d.1. e.1. f.8440.
Convert 7.8 km to miles.
GIVEN: 7.8 km FIND: mi
RELATIONSHIPS USED 1 km = 0.6214 mi
Convert 0.825 m to millimeters.
GIVEN: 0.825 m FIND: mm
RELATIONSHIPS USED 1 mm = 10-3 m
Do each of the following metric conversions. a. 3.55. kg to g b. 8944 mm to m c. 0.0187 L to mL d. 5.88 dL to L e. 1.01 x 10-8 s to nanosecond
f. 2.19 pm to m. a. 3.55 x 103 g b. 8.944 m c. 18.7 mL d. 0.588 L e. e. 10.1 ns f. f. 2.19 x 10-12 m
a. Convert 56.0 cm to inches. b. Convert 5678 m to kilometers. c. Convert 22.5 in. to cm. d. Convert 40.0 cm to in. e. Convert 10.0 km to miles f. Convert 3845 kg to pounds a. 22.0 in b. 5.678 km c. 57.2 cm d. 15.7 in e. 6.21 mi f. 8477 Ib
Convert 194 cm to feet. solution
We have an expert-written solution to this problem! a. A recipe calls for 1.2 cups of oil. How many liters of oil is this? (4 cups = 1 quart) b. A running track measures 1056 ft per lap. To run 15.0 km, how many laps should you run? (1 km = 0.6213 mile) c. An island is 5.72 nautical mi from the coast. How far is theisland in meters? (1 nautical mi = 1.151 mi) a. 0.28 L b. 46.6 laps c. 1.06 ×104 m
a. A runner wants to run 10.0 km. she knows that herrunning pace is 7.5 mi/hr. How many minutes must sherun? Hint: Use 7.5 mi/hr as a conversion factor between distance and time.
b. A patient needs 0.024 g of a sulfa drug. There are 8.0-mg tablets in stock. How many tablets should be given? a. 5.0 x 101 min b. three tablets
a. A bicyclist rides at an average speed of 24 mi/h. If she wishes to ride a total of 195 km, how many hours must she ride? b. A car was clocked at a speed of 65.0 mi/h. What is the speed of the car in meters/second? a. 5.0 hr b. 29.1 m/s
Synthroid is used as a replacement or supplemental therapy for diminished thyroid function. A physician's order called for 0.150 mg of Synthroid. If the tablets on hand contain 75 mcg of Synthroid, how many tablets must be given to provide the medication ordered?
A patient requires 0.024 g of a sulfa drug. There are 8.0-mg tablets in stock. How many tablets should be administered? A. eight tablets B. six tablets C. four tablets D. three tablets D. three tablets
DENSITY FORMULA
A jeweler offers to sell a ring to a woman, informing her that it is made of platinum. Thinking that the ring felt just a littlelight, the woman decides to test the ring for its density. She puts the ring on a balance and determines that it has a mass of 5.84 g. She also finds that the ring displaces 0.556 cm3of water. Is the ring made of platinum? The density of platinum is 21.4 g/cm3.
An aluminum engine block has a volume of 4.77 L and amass of 12.88 kg. What is the density of the aluminum in grams per cubic centimeter? 2.70 g/cm
We have an expert-written solution to this problem! The density of octane, a component of gasoline, is 0.702 g/mL. What is the mass, in kg, of 875 mL of octane? A. 12.5 kg B. 614 kg C. 1.25 kg
In a process called liposuction, a physician removes adipose tissue from a person's body. If body fat has a density of 0.94 g/mL and 3.0 L of fat are removed, how many pounds of fat were removed from the patient? A. 2.8 lb B. 4.6 lb C. 6.2 lb D. 8.1 lb C. 6.2 lb
