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Midterm Review ANSWERS 2009 - Greenwich Pulic Schools

By Dale Black,2014-08-31 02:42
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Midterm Review ANSWERS 2009 - Greenwich Pulic SchoolsPulic,pulic

Chemistry Name

    Midterm Exam Review 2009 Date Block

Units 1- 7 included on review sheet;

Unit 1. Measurement, Matter and Change

Measurement

1. Rank these measurements from the smallest to the largest: (hint: change all numbers to

    scientific notation) 4 md) 0.005 7 m a) 5.3 x 10

    3 -3b) 7.7 x 10 me) 5.1 x 10 m

    -2c) 4.9 x 10 m f) 0.072 m

    Correct order: e d c f b a

    2. For each of the following pairs of units, which is the larger unit?

    a) centigram or milligram centigram

    b) liter or centiliter liter

    c) calorie or kilocalorie kilocalorie

    d) millisecond or centisecond centisecond

    e) milliliter or kiloliter kiloliter

    33 3 f) mm or m m

    3. Round each of the answers given to the correct number of sig. figs.:

    a) 8.7 g + 15.43 g + 19 g = 43.13 g 43 g

    22b) 4.32 cm x 1.7 cm = 7.344 cm 7.3 cm

    c) 853.2 L ? 627.443 L = 225.757 L 225.8 L

    3 22d) 38.742 m ? 0.421 m = 92.023 m 92.0 m

4. Round off each of the following measurements to 3 significant figures:

    a) 98.473 L 98.5 L

    b) 0.000 763 21 cg 0.000 763 cg

    c) 57.048 m 57.0 m

     1

     3 and a mass of 27.2 g. What is the density of the 5. An object has a volume of 3.5 cm

    object? Show all work, units on every number, cancel units where possible, pay attention

    to sig. figs. and units in answer.

    33 D = ? g/cm m = 27.2 g V = 3.5 cm

    D = m/V = 27.2 g = 7.7714 g = 7.8 g 333 3.5 cm cm cm

    6. What is the volume of an object having a density of 1.05 g/mL and a mass of 4.85 mL?

     Show all work. units on every number, cancel units where possible, pay attention to sig. figs

     and units in answer.

     D = 1.05 g/mL m = 4.85 g

     D = m/V V = m/D = _ 4.85 g = 4.6190 mL = 4.62 mL

     1.05 g

     mL

7. Write the following measurements in scientific notation:

    2a) 572.5 km 5.725 x 10 km

    -3 b) 0.005 725 m 5.725 x 10 km

8. Write the following measurements in standard notation:

    -3a) 4.45 x 10 g 0.004 45 g

    7b) 4.45 x 10 mg 44 500 000 mg

9. A watch loses 0.15 seconds, (symbol for second is s), every day. How many minutes will

     the watch lose in 1.0 day? Show all work.: units on every number, cancel units where

     possible, pay attention to sig. figs and units in answer.

     0.15 s x 1 min = 0.0025 min

     1 day 60 s 1 day

2

Matter and Change

1. Identify each of the following as an element, a mixture, or as a compound:

    a) iced tea mixture

    b) ice compound

     c) table sugar compound

    d) silver element

     2. Classify each of the following as either a physical change or as a chemical change:

    a) bending a piece of glass PC

    b) melting an ice cube PC

    c) cooking a steak CC

    d) cutting grass PC

    e) burning wood CC

    f) sugar dissolving in water PC

    g) boiling water PC

3. Give the correct symbols for each of the following elements:

    a) sodium Na e) copper Cu

    b) aluminum Al f) magnesium Mg

     c) chlorine Cl g) iron Fe

    d) sulfur S h) nitrogen N

4. List the three common phases or states of matter: __solid_______________________,

     _________liquid__________________, and __________gas_______________.

5. Which of the following is NOT a physical property of matter? __flammability_____

     density color odor melting point boiling point

     texture flammability malleability luster

     3

Unit 2. Phase Changes and Thermochemistry

____ 1. Energy of motion is called

    A) potential B) chemical C) standard D) kinetic

____ 2. As the temperature of a substance increases, the ___ of its particles also increases.

    A) PE B) KE C) mass D) number

    ____ 3. The temperature of an object is a measure of the

    A) average KE of the particles that make up the object

    B) energy stored in the chemical bonds of the object

    C) number of joules released by the object

    D) heat content of the object

____ 4. The condensation point of pure water on the Celsius scale is ooooC B) 32.0 C C) 273.0 C D) 100.0 C A) 0.0

     o____ 5. The amount of heat energy released when 1.0 gram of a substance is cooled by 1.0 C, o (or is absorbed when 1.0 gram of the substance is heated by 1.0