1. Common Assessment #2 Review Atoms and the Atomic Theory Periodic Table and Characteristics of Elements Balancing Equations Chemical Bonding

2. Which of the following is used to measure the mass of an object? Balance Metric ruler Graduated cylinder Barometer

3. When compared to solids and liquids, gas molecules are Smaller less active Farther apart Filled with air

4. Which of the following rulers would you use to measure the width of a small diamond? A. A ruler measured in centimeters B. A ruler measured in millimeters C. A ruler measured in inches D. A ruler measured in ¼ inches

5. Which of the following materials is composed of one kind of atom? Water Carbon Air Salt

6. Which of the following shows that carbon is different from other elements? Its electrical charge Its use in photosynthesis Its number of protons Its ability to combine with oxygen

7. + + In this atom model, point A represents- A proton A neutron A nucleus An electron + + A D C B

8. + + In this atom model, point B represents- A proton A neutron A nucleus An electron + + A D C B

9. + + In this atom model, point C represents- A proton A neutron A nucleus An electron + + A D C B

10. + + In this atom model, point D represents- A proton A neutron A nucleus An electron + + A D C B

11. Which of these belongs in the outermost shell (energy level) of an atom? Photons Neutrons Protons Electrons

12. Which of these is found in the nucleus of an atom? Photons Ribosomes Protons Electrons

13. An electron has which of the following charges? Negative Neutral Positive Magnetic

14. A neutron has which of the following charges? Negative Neutral Positive Magnetic

15. A proton has which of the following charges? Negative Neutral Positive Magnetic

16. Which of the minerals below is a carbonate? Gypsum (CaSO4) Calcite CaCO3 Galena (PbS) Magnetite (Fe3O4) Radical NameSymbol CarbonateCO 3 SilicateSiO 3 SulfateSO 4 OxideO

17. How is the Bohr atomic model different from the modern model of an atom? The masses of the atomic particles are different. The numbers of electrons are different. The shapes of the nuclei are different. The arrangements of the electrons are different.

18. The combination of Iron (8Fe) and Sulfur (S 8 ) to form Iron Sulfide (8FeS) is an example a synthesis reaction. What is a balanced equation for this reaction? 8 Fe + S  FeS 2 8 Fe + S 8  8 Fe S 2 Fe + S  Fe 8S 8 Fe + S 8  8 FeS

19. When a base is mixed with an acidic solution, neutralization occurs because the --- Acid evaporates Base reaches absolute zero Base chemically reacts with the acid Mass of the solution increases

20. Because hydrogen can combine with other substances but cannot be changed into a simpler substance by an ordinary process, hydrogen is classified as --- A compound A mixture An acid An element

21. The atom is composed of electrons, protons, and neutrons. What is the electric charge of the nucleus? Neutral Negative Positive

22. A scientist predicts that red ink will diffuse faster in water when it is stirred then when it is left alone. He puts some water in a container, adds 2mL of red ink and times how long it takes to dissolve. When the student repeats the experiment to verify his prediction, the only thing that should change is -- A. the amount of water used. B. stirring the water. C. the temperature of the water. D. the amount of red ink used.

23. A teacher wanted to conduct a lab on volume. The teacher decided to use four different amounts of colored water in graduated cylinders. The volume of the cylinders should be measured in - A. Centimeters B. Millimeters C. Milliliters D. grams

24. A teacher wanted to conduct a lab on mass. The teacher decided to use four different size weights and measure them on a triple-beam- balance. The mass of the weights should be measured in - A. Centimeters B. Millimeters C. Milliliters D. grams

25. A student wanted to determine the density of a nugget of gold. What two measurements does the student need to determine the density of her nugget of gold? A. Length and width B. Mass and volume C. Mass and length D. Volume and Length

26. Which of the following is a physical property of gold? A. Reacts with water to form an acid B. Turns into a liquid at room temperature C. Ductile, can be drawn into a wire D. Readily reacts with oxygen

27. Temperatures in January 8 If the temperature continues to increase, what would the approximate temperature be on 8 January? A. 30 B. 40 C. 45 D. 50 or over 50

28. Temperatures in January 8 What information does this graph show? A.The amount of rainfall in January. B.How the temperature changes daily in January. C.How sunlight affects temperature. D.Where temperature is the warmest. 50

29. How a student spends their time during the week At School 39 hours Sleeping 65 hours Homework 8 hours Watching t.v., chores, eating, leisure time at home. 20 hours Activities; Sports, hobbies… 26 hours What percent of the time during the week do students spend sleeping? A. 39% B. 21% C. 8% D. 65%

30. Find the density of the cube 3CM Mass = 27g A. 0.5g/cm 3 B. 1.5g/cm 3 C. 2.5g/cm 3 D. 1.0g/cm 3

31. Which of these BEST shows particles in a mixture? D. C. A. B

32. Which of the following molecules does NOT contain three atoms? O 3 N 2 H 2 O CO 2

33. Which of the following illustrates the structure of a molecule of carbon dioxide (CO 2 )? A.Ca – O C. H O O H B.O D. C C C O O

34. How far does a student have to travel to get an ice cream cone? Student’s home Student’s home Ice Cream Shop Ice Cream Shop 123456789 (Centimeters ) 1 centimeter = 100 meters A. 9 centimeters C. 900 meters B. 9 meters D. 90 meters

35. In an experiment combining vinegar and an indicator, the vinegar changes color. In this chemical reaction, the indicator and vinegar are A. Elements B. Products C. Reactants D. Suspensions

36. In the chemical formula for carbon dioxide, CO 2, what does the subscript 2 represent? The number of carbon and oxygen atoms in each molecule of carbon dioxide The number of carbon atoms in each molecule of carbon dioxide The number of oxygen atoms in each molecule of carbon dioxide

37. The diagram below shows a block form the periodic table. The number 11 represents the Atomic mass of the element Sodium Atomic number of the element Sodium Number of neutrons in the element Sodium Number of valence electrons in the element Sodium 23.0 Na 11

38. Characteristics of Samples of Matter SampleLusterMalleability /Ductility Electrical Conductivity 1NoneNoInsulator 2HighNoSemi- conductor 3HighYesConductor 4LowNoInsulator According to the data in the table, which sample of matter is most likely a metal? A. 1 B. 2 C. 3 D. 4

39. Unknown Liquids Data SampleIndicatorColor ChangeElectrical Conductivity Unknown 1Litmus paperRedAcid Unknown 2Litmus paperPinkAcid Unknown 3Litmus paperPinkAcid Unknown 4Litmus paperBlueBase Students conducted an investigation to determine if unknown liquids were acids or bases. What was the dependent variable in this investigation? A. Sample C. Color change B. Indicator D. Identification

40. Unknown Liquids Data SampleIndicatorColor ChangeElectrical Conductivity Unknown 1Litmus paperRedAcid Unknown 2Litmus paperPinkAcid Unknown 3Litmus paperPinkAcid Unknown 4Litmus paperBlueBase Students conducted an investigation to determine if unknown liquids were acids or bases. What was the independent variable in this investigation? A. Sample C. Color change B. Indicator D. Identification

41. Unknown Liquids Data SampleIndicatorColor ChangeElectrical Conductivity Unknown 1Litmus paperRedAcid Unknown 2Litmus paperPinkAcid Unknown 3Litmus paperPinkAcid Unknown 4Litmus paperBlueBase Students conducted an investigation to determine if unknown liquids were acids or bases. What is one of the constants in this investigation? A. Sample C. Color change B. Indicator D. Identification

42. Which of these elements has an atomic number of 13? 5 B Boron 10.811 6 C Carbon 12.011 7 N Nitrogen 14.0067 13 Al Aluminum 29.9815 14 Si Silicon 28.0855 15 P Phosphorous 30.97376 A. N B. Al C. Si D. P

43. Which of these elements the lowest average atomic mass? 5 B Boron 10.811 6 C Carbon 12.011 7 N Nitrogen 14.0067 13 Al Aluminum 29.9815 14 Si Silicon 28.0855 15 P Phosphorous 30.97376 A. N B. B C. Si D. P

44. Which of the metals listed below is an Alkali metal? A. Be B. B C. N D. Li

45. Which of the elements listed below is a Noble Gas? A. He B. B C. N D. Li

46. Which of the elements listed below is a Noble Gas? A. He B. B C. N D. Li