CHEM120PracticeExam1Name:
Be sure you have read the important note on the first page before starting the exam. Question 1a: Mass
Number of moles
The box to the right has eight different properties listed inside. Circle all of the properties that are Intensive Color Melting Point Properties. Intensive properties are ones that do not depend on the amount of a substance. Density Volume Temperature Energy Question 1b: Read the following descriptions and choose whether the substance inside the container is a compound, element, or mixture. If it is a mixture, choose whether it is a homogeneous or heterogeneous mixture. a) A balloon of Helium gas: compound element mixture homogeneous heterogeneous b) A bottle of Italian salad dressing: compound element mixture homogeneous heterogeneous c) A gas canister full of O2 (oxygen gas): compound element mixture homogeneous heterogeneous d) A gas canister full of ammonia gas (NH3): compound element mixture homogeneous heterogeneous Question 1c: List 3 properties of metals: Question 1d: If your calculator reads 0.0045812 and your answer requires 2 significant digits, what is the correct answer? Stanich2011
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CHEM120PracticeExam1Name:
Question 2: Fill in the table: a. 1 kg  _ ___ g b. 1 m  __ ____ dm c. 45˚C = _ ____ K d. 15˚C = _ ____ ˚F e. 1 g  __ __ μg f. 1 m  _ _ cm g. 1 hour  __ __ s h. 1 L  _ ___ cm3 Question 3: a) Write the name of element P: ____ _______ b) The element P has how many protons? ____ ______________________ c) A neutral P has how many electrons? ______ _____________________ d) Write the electron configuration for P below: Question 4: a) Circle all of the choices to the right that are correct: 14
N and 15N have the same number of: Protons Electrons Neutrons Valence Electrons Cations Anions Compounds b) Circle all of the choices to the right that are correct: 14
N and 15N are called: Isotopes c) The number of neutrons in 15N is: ________________________ Stanich2011
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CHEM120PracticeExam1Name:
Question 5: a) Circle all of the choices to the right that are correct: N3– and O2– have the same number of: Protons Electrons Valence Electrons Cations Anions b) Circle all of the choices to the right that are correct: N3– and O2– are both Isotopes 2–
c) How many electrons does O have? _____________________________ Question 6: a) How many valence electrons does Br have? ________________________ b) Which shell contains the valence electrons of Br? ________________________ c) The atomic mass of Br is: ___ __________________ d) If Br has 44 neutrons, what is the mass number? Question 7: Coal is a solid made completely of Carbon. You have a chunk of coal with a length of 3.00 inches, width of 2.56 inches, and a height of 10.043 inches. a) What is the volume of this chunk of coal in cm3 ? Stanich2011
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CHEM120PracticeExam1Name:
b) The density of this type of coal is 1506 kg/m3, what is the mass of this chunk of coal in kg? Question 8: You have 125 g of water at 10.0oF. You add 30.5 kcal of energy to the water. What is the final temperature and phase of the water after this process? Stanich2011
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