Chemistry Summer School Pre-Test 2015

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1 NAME: 1. A material consists of pure sodium. How many types of atomic structures are present in this substance? (C.1.1) A. No atomic structures are present as this is a pure substance. B. One type of atomic structure is present as this is a pure substance. C. Two types of atomic structures are present in this substance. D. Several types of atomic structures are present in this substance. 2. Seawater is not a pure substance because. (C.1.1) A. it is salty B. it is a liquid C. it has hydrogen as part of its composition D. its composition may be different from sample to sample 3. This picture shows some properties of copper. What is the smallest possible portion of copper that still retains the properties of copper? (C.1.1) A. atom B. electron C. element D. molecule

2 4. Which of the below statements BEST explains the difference between a solution and a mixture? (C.1.1) A. Solutions can only occur in liquids B. Mixtures results from chemical changes C. Solutions have an even distribution of molecules that make them up D. Mixtures have an even distribution of molecules that make them up. 5. The following reaction occurs when natural gas is burned. Which of these is TRUE about the reaction? (C1.3 / 1.4) A. The atoms that make up the natural gas are destroyed during the reaction. B. The products in this reaction are carbon dioxide and oxygen. C. The reactants in this reaction are oxygen and carbon dioxide. D. New substances are formed in the reaction. 6. A student is studying physical and chemical changes. He cuts an apple into four pieces, then leaves them sitting out on a plate for several hours. He observes that the color of the apple turns brown. Which statement about this investigation is true? (C.1.3) A. Cutting the apple and the change in color are both physical changes. B. Cutting the apple and the change in color are both chemical changes. C. Cutting the apple is a physical change and the change in color is a chemical change. D. Cutting the apple is a chemical change and the change in color is a physical change.

3 7. Which of these describes what happens when liquid water becomes water vapor? (C.1.4) A. The particles in water vapor become softer than the particles in liquid water. B. The atoms of hydrogen and oxygen separate in a chemical change. C. Air particles separate the liquid water particles and turn the water into a gas. D. The particles in water vapor become more spread out than the particles in liquid water. 8. Which of the below would result in a rearrangement of atoms at the molecular level? (C.1.3) a. salt is dissolved in water b. broken tree branches c. gasoline combusts in an engine d. steam rising from hot pavement 9. When molecules that were vibrating in constant position in a substance suddenly become able to slide past one another, but still remain relatively close, the process is called (C.1.4) a. freezing b. melting c. solidifaction d. sublimination 10. What isotope has five protons and six neutrons? (C.2.3) a. Boron-5. b. Boron-11. c. Carbon-6. d. Carbon Which particles make up an atom of oxygen-18? (C.2.3) a. 10 protons, 10 electrons, and 8 neutrons b. 8 protons, 10 electrons, and 10 neutrons c. 10 protons, 10electrons, and 18 neutrons d. 8 protons, 8 electrons, and 10 neutrons

4 12.Which of the below BEST describe the relationship between Atomic Mass list on the periodic table and the arrangement of particles in an atom? (C.2.3) A. Atomic mass is the total number of particles outside of the nucleus B. Atomic mass only accounts for negatively charges particles C. Atomic mass represents the average number of particles inside the nucleus across all isotopes D. Atomic mass represents the total particles in the isotope most often found in nature 13. Which orbital-filling diagram represents the element vanadium? (C.2.5) a. [Ar] _.... 4s 3d b. [Ar] _.... 4s 3d c. [Ar]. _.... 4s 3d d. [Ar] s 3d 14. The electron configuration for copper is (C.2.5) a. [Ar]3s 2 3d 7 b. 1s 2 2s 2 2p 6 3s 1 3p 6 3d 6 c. [Ar]4s 2 3d 9 d. 1s 2 2s 2 2p 6 3s 2 3p 4 3d 9 15.In a neutral state, the halogens (Group 7) have an electron dot structure that most closely resembles. (2.5 / 2.6) A B C D

5 16. Among the groups of elements listed below, which have the same number of electrons in their outermost energy levels? (2.5 / 2.6) A Li, B, C, F B Na, Mg, Al, S C C, K, Ca, Rb, Sr D F, Cl, Br, I, 17. Compared with ionic compounds, covalent compounds (C.3.1) a. have low boiling points b. are malleable c. are ductile d. have high boiling points 18. Among the following, which combination would be most likely to form an ionic bond? (C.3.1) a. H and O b. S and Cl c. Na and I d. Si and O 19. Which atom is likely to form a +2 ion? (C.3.2) a. Li b. Ca c. O d. Al 20. A covalent bond forms (C.3.2) a. When an element becomes a noble gas b. When atoms share electrons c. Between metals and nonmetals d. When electrons are transferred from one atom to another

6 21. What is the correct chemical formula for nitrogen dioxide? (C.3.4) a. NO b. NO2 c. N2O d. (NO)2 22. What is the formula for aluminum oxide? (C.3.4) a. AlO3 b. Al2O3 c. Al3O2 d. Al2O 23. How many moles of Ba are in 828 g Ba? (C.4.3) a. 828 mol b mol c x mol d x 10 5 mol moles of potassium atoms weighs (C.4.3) a. 156 g b g c g d x g 25. How many atoms of silver are in a necklace that weighs 12.7 g? (C.4.3) a x atoms b x atoms c x atoms d x A chemical mole (C.4.3) a. is a kind of material b. is a large molecule c. contains an undetermined number of ions d. contains 6.02 x particles 27. What is the molarity of a 0.8 moles of KCl in 2 liters of solution? (C.7.3) a. 2.8 M b. 1.6 M c. 0.4 M d. There is not enough information to decide.

7 28. What mass of Ca(OH)2 is contained in 1500 ml of M Ca(OH)2 solution? (C.7.3) a g b g c g d g 29. The total mass of a solution is grams. The solvent mass is grams. What is the mass percent of the solute? (C.7.3) a % b % c % d. not enough information to tell 30. The rubbing alcohol sold in drug stores is often composed of 70% isopropyl alcohol and 30% water. In this solution (C.7.1 / 7.3) a. water is the solvent b. water is the solution c. isopropyl alcohol is the solute d. isopropyl alcohol is the solvent 31. Which of the below is the most accurate definition of an acid (C.8.1) A. Any substance that dissolves something else B. Any substance where the bonding will occur ionically C. A substance that when dissolved in water increases the concentration of hydrogen ion, H + (aq). D. a substance that when added to water increases the concentration of hydroxide ion, OH - (aq). 32. Choose the list of properties that correctly identifies properties of a BASE (C.8.2) A. PH greater than 7, proton acceptors, taste bitter B. PH less than 7, proton donors, taste sour C. PH of 7, neuron donors, taste sweet D. PH greater than 7, proton donors, taste sour

8 33. PH of an ACID is BEST define as which of the below? (C.8.3) A. The power of the acid B. The number of bonds that an acid will form C. the probability that an acid will release an H + ion. D. The probability that and acid will donate protons 34. Analyze the below picture and use it to answer the question that follows: Based on the above picture which of the below statements is TRUE? (C.8.3) A. Orange juice is a stronger acid than HCL secreted in the stomach B. Coffer is a weaker acid than orange juice C. Bleach is the ONLY BASE listed in the picture D. According to the picture water is listed as a strong base.

9 Answer Key Ques Answer Indicator 1 C C D C C C B C B (C1.3 / 1.4) 6 A C C C C C B C B C A C B C A C C C D C.2.5 / C D C.2.5 / C A C C C B C B C B C B C B C A C B C D C C C D C B C D C 7.1 / C C A C C C B C.8.3

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