PreComp White Board Review

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

PreComp White Board Review

Similar presentations

Presentation on theme: "PreComp White Board Review"— Presentation transcript:

Similar presentations

About project

Feedback

Log in

Auth with social network:

PreComp White Board Review

Similar presentations

Presentation on theme: "PreComp White Board Review"— Presentation transcript:

Similar presentations

About project

Feedback