CHEM 120 Midterm Exam

Question: Joe conducts an experiment to test the effectiveness of a new drug for cancer. Which of the following variables would be easiest to control? Question: A mixture containing 50 grams of carbon and 75 grams of oxygen is sealed in a flask. The total mass of the system is 225 grams. The flask is heated to cause the carbon and oxygen to react. The sealed flask is What is the mass of the sealed flask? Question: Aluminum has a density of 2.7 g/cm3. What would be the mass, in g, of a block of aluminum with a volume of 15 cm3? Question: How many kilometers are in 800 m? Question: One mole is of carbon is equal to Question: The element iron (Fe) occurs naturally as four isotopes. Each of these isotopes has Question: How many neutrons are in this isotope of tin? Question: The element with the ground state electron configuration of 1s2 2s2 2p6 3s2 3p5 is Question: The number of protons in a chloride ion, Cl-, is Question: When barium reacts with iodine, barium ions, Ba2+, and iodide ions, I-, are formed. In this reaction, iodine atoms Question: Which substance has ionic bonds? Question: The name of the compound S2O3 is Question: In a nonpolar covalent bond, electrons are Question: The formula of magnesium nitride is Question: Which is the electron dot structure of nitrogen? Question: Which atom is least likely to form an ion? Question: The formula mass of CO2 is Question: How many moles of (NH4