PreComp White Board Review Which of the following would be used to measure the mass of an object? A. Graduated cylinder B. Ruler C. Thermometer D. Electronic balance Answer: D

PreComp White Board Review A __________________ should be used for making solutions and dilutions. A. Beaker B. Volumetric flask C. Graduated cylinder D. Funnel Answer: B

PreComp White Board Review Select the piece of lab equipment that is INCORRECTLY paired with its unit of measurement. A. Meterstick: meters B. Graduated cylinder: centimeters C. Thermometer: degrees Celsius D. All of the above are correctly paired Answer: B

PreComp White Board Review You are asked to add 20.0 mL of water to a reaction. Which piece of glassware would be the best choice? A. Beaker B. Erlenmeyer flask C. Test tube D. Graduated cylinder Answer: D

PreComp White Board Review Identify the piece of lab equipment that is CORRECTLY paired with the quantity it measures. A. Ruler: length B. Volumetric flask: mass C. Thermometer: liquid volume D. Graduated cylinder: length Answer: A

PreComp White Board Review Four students measure the length of a metal wire that is exactly 4.0 cm long. Which set of measurements is the LEAST precise? A) 3.5 cm, 4.1 cm, 5.9 cm B) 4.0 cm, 7.0 cm, 5.0 cm C) 2.1 cm, 2.2 cm, 2.2 cm D) 0.4 cm, 4.0 cm, 40 cm Answer: D

PreComp White Board Review Oliver, Ms. Fonda’s dog, has a mass of 5.9 kg. When students measure the mass of Oliver themselves, they record different masses. Which mass is the MOST accurate? A) 6.3 kg B) 6.5 kg C) 5.2 kg D) 5.8 kg Answer: D

PreComp White Board Review Students performed an experiment to determine the number of moles of HCl in a sample of water. Their results are shown in the table below. The actual number of moles in the sample was determined to be 1.00 mol. The students’ results are therefore Both accurate and precise Accurate but not precise Precise but not accurate Neither accurate nor precise Answer: C Trial Moles of HCl (mol) 1 1.51 2 1.49 3 1.50

PreComp White Board Review Measurements that are precise are A. Close to the actual value B. Important C. Reproducible D. Large values Answer: C

PreComp White Board Review A substance composed of atoms of two or more different elements chemically bonded together is a(n) A. Element B. Compound C. Homogeneous mixture D. Heterogeneous mixture Answer: B

PreComp White Board Review A substance composed of only one type of atom is a(n) A. Element B. Compound C. Homogeneous mixture D. Heterogeneous mixture Answer: A

PreComp White Board Review Which of the following CANNOT be broken down into a simpler substance? A. Table sugar B. Table salt C. Carbon dioxide D. Gold Answer: D

PreComp White Board Review Which of the following CAN be decomposed into simpler substances? A. Co B. NO C. Mo D. Ar Answer: B

PreComp White Board Review Oxygen gas, O2, is a(n) ___________, and helium gas, He, is a(n) ___________. A. Element; element B. Compound; compound C. Element; compound D. Compound; element Answer: A

PreComp White Board Review Which of the following is a pure substance? A. Element B. Compound C. Mixture D. Both (a) and (b) Answer: D

PreComp White Board Review ________ is an example of a mixture. A. Air B. Water C. Table salt D. Heat Answer: A

PreComp White Board Review Which diagram represents a mixture? Choose the letter of the diagram as your answer. Answer: C

PreComp White Board Review How many diagrams represent a pure substance? A. One B. Two C. Three D. Four Answer: C

PreComp White Board Review The periodic table is arranged in order of A. Increasing atomic number B. Increasing atomic mass C. Alphabetical symbols D. There is no specific order Answer: A

PreComp White Board Review The amount of which subatomic particle is used to determine the order of elements on the periodic table? A. Protons B. Neutrons C. Electrons D. Leptons Answer: A

PreComp White Board Review All atoms of an element have the same number of A. Protons B. Neutrons C. Electrons D. Leptons Answer: A

PreComp White Board Review The horizontal rows on the periodic table are called _____________________, and the vertical columns on the periodic table are called _____________________. A. Periods; groups B. Periods; periods C. Groups; periods D. Groups; groups Answer: A

PreComp White Board Review Identify the element below that would have chemical properties most similar to chlorine. A. Sulfur B. Selenium C. Fluorine D. Argon Answer: C

PreComp White Board Review What element is in period 2, group 3? A. Boron B. Magnesium C. Aluminum D. Calcium Answer: A

PreComp White Board Review Which group on the periodic table is the LEAST reactive? A. Transition metals B. Alkali metals C. Halogens D. Noble gases Answer: D

PreComp White Board Review What is the name of group 2A? A. Halogens B. Noble gases C. Alkaline earth metals D. Alkali metals Answer: C

PreComp White Board Review What is the name of groups 3B-12B? A. Main group elements B. Transition metals C. Alkali metals D. Nonmetals Answer: B

PreComp White Board Review Which group on the periodic table includes soft metals that are very reactive with air and water? A. Halogens B. Noble gases C. Alkaline earth metals D. Alkali metals Answer: D

PreComp White Board Review Which group on the periodic table includes highly reactive solid, liquid, and gaseous nonmetals (at room temperature and pressure)? A. Halogens B. Noble gases C. Alkaline earth metals D. Alkali metals Answer: A

PreComp White Board Review Which of the following is a metalloid? A. Al B. Si C. Ni D. H Answer: B

PreComp White Board Review Which of the following is a nonmetal? A. Mg B. B C. As D. Se Answer: D

PreComp White Board Review All of the following are properties of metals EXCEPT A. Good conductors of heat and electricity B. Brittle C. Tend to lose electrons D. Form positive ions Answer: B

PreComp White Board Review Which element below is a good semiconductor? A. B B. Al C. Ga D. In Answer: A

PreComp White Board Review Identify the element below that is a good insulator. A. S B. Cu C. Na D. Ca Answer: A

PreComp White Board Review An orbital can hold, at most, ______ electrons. A. Two B. Four C. Six D. Eight Answer: A

PreComp White Board Review After the 4p subshell is filled, to which subshell are new electrons added? A. 4d B. 5s C. 3f D. 4s Answer: B

PreComp White Board Review An electron’s energy level is defined as A. The region of space in which you’re most likely to find the electron B. The circular path of the electron around the nucleus C. The specific amount of energy associated with the electron D. The volume of an electron Answer: C

PreComp White Board Review Which element in group 6A has four energy levels? A. Tl B. Pb C. Se D. S Answer: C

PreComp White Board Review What is the electron capacity of d orbitals in an electron shell? A. 2 electrons B. 6 electrons C. 8 electrons D. 10 electrons Answer: D

PreComp White Board Review Which element has the electron configuration 1s22s22p63s23p64s1? A. Na B. C C. K D. Ga Answer: C

PreComp White Board Review What is the correct electron configuration of silicon, Si? A. 1s22s23s2 B. 1s22s22p2 C. 1s22s22p63s23p2 D. 1s22s83s23p2 Answer: C

PreComp White Board Review An atom of sodium contains 11 electrons. How many energy levels are needed for this number of electrons? A. 1 B. 2 C. 3 D. 4 Answer: C

PreComp White Board Review What is the possible identity of a species with the electron configuration 1s22s22p63s23p6? A. Ar B. Cl C. Cl -- D. Both (a) and (c) Answer: D

PreComp White Board Review All of the following represent electron configurations of noble gases EXCEPT A. 1s2 B. 1s22s2 C. 1s22s22p6 D. 1s22s22p63s23p6 Answer: B

PreComp White Board Review Chlorine has _____ total electrons. Of those electrons, _____ are valence electrons. A. 17; 7 B. 17; 17 C. 35; 7 D. 35; 17 Answer: A

PreComp White Board Review In what energy level are calcium’s valence electrons? A. n=1 B. n=2 C. n=3 D. n=4 Answer: D

PreComp White Board Review A neutral atom has the electron configuration 1s22s22p4. How many valence electrons does this atom have? A. Two B. Four C. Six D. Eight Answer: C

PreComp White Board Review How many core electrons does an atom of oxygen have? A. Two B. Four C. Six D. Eight Answer: A

PreComp White Board Review Which element has five valence electrons and three total energy levels? A. Na B. V C. P D. N Answer: C

PreComp White Board Review How many valence electrons do alkaline earth metals have? A. Two B. Four C. Six D. Eight Answer: A

PreComp White Board Review Ions of chlorine have a -1 charge. What does this mean? A. Chlorine atoms gain one electron B. Chlorine atoms lose one electron C. Chlorine atoms gain one proton D. Chlorine atoms lose one proton Answer: A

PreComp White Board Review Which group on the periodic table does not form ions? A. Group 1A B. Group 2A C. Group 7A D. Group 8A Answer: D

PreComp White Board Review An ion has 8 protons, 10 electrons, and 9 neutrons. What is the charge of this ion? A. +1 B. -1 C. +2 D. -2 Answer: D

PreComp White Board Review What is the electron capacity of the 2nd electron shell outside the nucleus? A. 2 B. 6 C. 8 D. 18 Answer: C