Atoms, Molecules, Compounds

Question 1 of 10 Group 7A elements are also called: A. halogens. B. alkaline earth metals. C. alkali metals. D. noble gases. E. none of the above

Question 2 of 10 An atom containing 7 protons, 8 neutrons, and 7 electrons A. is charge-neutral. B. is an oxygen atom. C. is an ion. D. cannot exist. E. none of the above

Question 3 of 10 What is the charge on the ion formed by aluminum? A. 13+ B. 3+ C. 3- D. 5- E. none of the above

Question 4 of 10 The names of the elements whose symbols are Si, P, Mn, and S are respectively, A. silicon, phosphorus, manganese, and sulfur. B. silicon, potassium, magnesium, and sulfur. C. silicon, phosphorus, magnesium, and sulfur. D. silicon, potassium, magnesium, and sodium. E. silver, phosphorus, magnesium, and sulfur.

Question 5 of 10 How many neutrons are present in Ne-22? A. 10 B. 22 C. 32 D. 12 E. none of the above

Question 6 of 10 Which statement below accurately describes the contributions of Dalton? A. created the modern periodic table B. discovered the existence of electrons C. ancient Greek philosopher who proposed that matter was continuous D. proposed the modern Atomic Theory E. none of the above

Question 7 of 10 Which of the following is a molecular compound? A. nitrogen monoxide B. calcium acetate C. barium sulfide D. potassium hydroxide E. none of the above

Question 8 of 10 How many oxygen atoms are in the formula Al2(CO3)3? A. 1 B. 9 C. 6 D. 3 E. none of the above

Question 9 of 10 Choose the pair of names and formulas that do NOT match. A. copper(II) nitride: Cu3N2 B. copper(II) nitrite: Cu(NO2)2 C. copper(I) nitrate: CuNO3 D. copper(II) nitrate: Cu(NO3)2 E. all of these are correct

Question 10 of 10 What is the formula mass for potassium nitrate? A. 85.11 amu B. 92.99 amu C. 117.11 amu D. 101.10 amu E. none of the above

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