Unit 1 Study Guide - Unit 1 Study Guide 1. It is estimated...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Unit 1 Study Guide 1. It is estimated that uranium is relatively common in the earth's crust, occurring in amounts of 4 g / metric ton. A metric ton is 1000 kg. At this concentration, what mass of uranium is present in 1.5 mg of the earth's crust? A) 6 nanograms B) 6 micrograms C) 6 milligrams D) 6e–5 g E) 6 centigrams 2. In 1928, 98.0 g of a new element was isolated from 660 kg of the ore molybdenite. The percent by mass of this element in the ore was: A) 150 % B) 6.6 % C) 98.0 % D) 1.5e–2 % E) 64.7 % 3. Which of the following metric relationships is incorrect? A) 1 microliter = 10 –6 liters B) 1 gram = 10 3 kilograms C) 10 3 milliliters = 1 liter D) 1 gram = 10 2 centigrams E) 10 decimeters = 1 meter 4. Which of the following is an example of a quantitative observation? A) The piece of metal is longer than the piece of wood B) Solution 1 is much darker than solution 2. C) The liquid in beaker A is blue. D) The temperature of the liquid is 60°C. E) At least two of the above (a-d) are quantitative observations. 5. A quantitative observation A) contains a number and a unit. B) does not contain a number. C) always makes a comparison. D) must be obtained through experimentation. E) none of these 6. Generally observed behavior which can be formulated into a statement, sometimes mathematical in nature, is called a(n) A) observation. B) measurement. C) theory. D) natural law. E) experiment. 7. The statement “The total mass of materials is not affected by a chemical change in those materials” is called a(n) A) observation. B) measurement. C) theory. D) natural law. E) experiment. 8. What is the measure of resistance an object has to a change in its state of motion? A) mass B) weight C) volume D) length E) none of these 9. Express 0.00560 in exponential notation. A) 5.60 × 10 3 B) 5.6 × 10 -3 C) 5.60 × 10 -3 D) 5.60 E) none of these 10. A titration was performed to find the concentration of hydrochloric acid with the following results: Trial Molarity 1 1.25 ± 0.01 2 1.24 ± 0.01 3 1.26 ± 0.01 A) both accurate and precise. B) accurate but imprecise. C) precise but inaccurate. D) both inaccurate and imprecise. E) accuracy and precision are impossible to determine with the available information. 11. Which of the following is the least probable concerning five measurements taken in the lab? A) The measurements are accurate and precise. B) The measurements are accurate but not precise. C) The measurements are precise but not accurate. D) The measurements are neither accurate nor precise. E) All of these are equally probable. 12. We generally report a measurement by recording all of the certain digits plus ____ uncertain digit(s). A) no B) one C) two D) three E) four 13. The amount of uncertainty in a measured quantity is determined by: A) both the skill of the observer and the limitations of the measuring instrument. B)
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 01/15/2012 for the course CHEM 101 taught by Professor Curtis during the Spring '11 term at Austin Community College.

Page1 / 7

Unit 1 Study Guide - Unit 1 Study Guide 1. It is estimated...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online