Calculations and Research

Question 1 of 10 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? A. The remaining 1.8 grams was converted into heat. B. Nothing, the burned wood simply has a mass of 1.2 grams. C. The remaining 1.8 grams was converted into gaseous compounds. D. The remaining mass was destroyed. E. none of the above Answer Key: C

Question 2 of 10 Who discovered the atomic theory? A. Antoine Lavoisier B. John Dalton C. Nivaldo Tro D. John Dalton and Antoine Lavoisier E. none of the above Answer Key: B

Question 3 of 10 The correct scientific notation for the number 0.00050210 is: A. 5.021 × 10^-4 B. 5.0210 × 10^-4 C. 5.0210 × 10^4 D. 5.021 × 10^4 E. none of the above Answer Key: B

Question 4 of 10 How many low dose 81 mg aspirin tablets can be made from 1.21 kg of aspirin? A. 1.5 × 10^3 tablets B. 1.21 × 10^3 tablets C. 1.21 × 10^4 tablets D. 1.5 × 10^5 tablets E. 1.5 × 10^4 tablets Answer Key: E

Question 5 of 10 A lead ball has a mass of 55.0 grams and a density of 11.4 g/cm3. What is the volume of the ball? A. 4.82 mL B. 0.207 mL C. 4.82 L D. 0.207 L E. none of the above Answer Key: A

Question 6 of 10 Determine the answer to the following equation with correct number of significant figures: (4.123 × 0.12) + 24.2 = ________ A. 24.70 B. 25 C. 24.695 D. 24.7 E. none of the above Answer Key: D

Question 7 of 10 Which state of matter has atomic spacing that is close together and indefinite shape? A. gas B. plasma C. liquid D. solid E. none of the above Answer Key: C

Question 8 of 10 A pure substance is: A. composed of two or more different types of atoms or molecules that has constant composition. B. composed of only one type of atom or molecule. C. composed of two or more different types of atoms or molecules combined in variable proportions. D. composed of two or more regions with different compositions. E. none of the above Answer Key: B

Question 9 of 10 How many joules are there in a 255 Calorie (nutritional calorie) snack bar? A. 1.07 × 106 B. 1.07 × 103 C. 6.09 × 104 D. 2.55 × 105 E. none of the above Answer Key: A

Question 10 of 10 What is the value of 335 K on the Celsius temperature scale? A. 167 B. 608 C. 66.4 D. 62 E. none of the above Answer Key: D