Chapter 2 Review

50 Points  The SI scale of measurement is  A. Celsius scale  B. Kelvin scale  C. Calorie scale  D. Fahrenheit scale

100 Points  Energy can be defined as the capacity to  A. Exert force  B. Resist air resistance  C. Produce a chemical change  D. Do work

200 points  Electrolysis can be used in  A. Separation of water into oxygen and hydrogen  B. Tearing paper into simpler substances  C. Process of evaporation of saltwater  D. None of the above

300 Points  Which is not an example of a heterogeneous mixture  A. Milk  B. Paint  C. Concrete  D. Air

400 Points  Why are elements and compounds considered to be pure substances  A. Both are found on Periodic Table  B. Both have unique physical and chemical properties  C. Both always have two or more elements  D. Both cannot be broken down further

500 Points  Law of Conservation of Matter states:  A. Matter is not like energy  B. Matter is always conserved in chemical processes  C. Matter is neither created or destroyed in any process  D. Matter is saved in small particles

1000 Points  When new properties are observed during a change of state are signs of  A. Chemical changes – identity of substance changes  B. New properties appear briefly  C. No gas, heat or light occurs  D. Physical changes – identity of substance does not change

2000 Points  Which of the following are chemical changes?  A. Cracking an egg open  B. Burning your pizza  C. Water disappearing on a hot day  D. Condensation or dew forming on the grass in the morning

3000 Points  Which of the following is an example of a physical change?  A. Leaves turning colors in the fall  B. A nail rusting  C. Melting a piece of wax  D. Burning a log

4000 Points  Absolute Zero corresponds to what value?  A. 0 K  B K  C. 273 K  D. 0° C

5000 Points  Which of the following is an example of potential energy?  A. Flashlight battery  B. Gasoline in your car  C. A rock held at the top of the Empire State Building  D. All of the above

6000 Points What are the symbols for the following elements?  Potassium  Sodium  Copper  Lead  Tin  Mercury  Iron  Gold  Silver KK  Na  Cu  Pb  Sn  Hg  Fe  Au  Ag

7000 Points  What are the three ways that energy and matter are related?  A. Need energy to move matter  B. Matter and energy are not conserved  C. Use temperature scales to measure changes in matter  D. Can convert matter into energy

8000 Points  If you had a g sample of water and you pass an electric current through the sample, you find that only 16.3g of hydrogen gas is released. How much oxygen is then produced?  A g  B g  C g  D g

9000 Points  How would you separate a mixture of iron filings, sand, salt, and water?  A. Use a magnet, filter, distillation  B. Filter, use a magnet, crystallization  C. Distill the mixture, filter, use a magnet  D. This mixture cannot be separated

10000 Points  What is the freezing point of water in both Celsius and Kelvin scale?  A. -273°C and 0 K  B. 32° C and 305 K  C. 0°C and 273 K  D. 0°C and 0 K

25000 Points  Describe how to remove the solid impurities from water to attain pure water  A. Filtration – use filter paper to collect the impurities  B. chromatography – each solid has unique properties that can be separated by color  C. Electrolysis – separate by using an electric current  D. Distillation – boiling of water – leaves solids behind – collect the vapor and cool it to form liquid

50000 Points  Wine contains alcohol, but foods cooked in wine do not have alcohol. Why does this ‘seem’ to contradict the Law of Conservation of Matter?  A. Alcohol concentration is low in wine, so what little is cooked cannot be noticed  B. Alcohol evaporates quickly when heated  C. Cooking destroys the alcohol  D. None of the above

100,000 Points  Define absolute zero. Has it been reached?  A. Temp at which motion stops. Scientists can only obtain this temp in the laboratory  B. Temp at which motion slows, scientists have attained this temp many times  C. temp at which all motion stops. As atoms get closer to absolute zero it is harder to remove any more heat  D. Temp at which motion slows, but is very difficult to attain due to the energy removal

250,000 Points  How many joules of energy are in one gallon of gasoline? (1 ml = 2.09 x calories and 1 gallon is L)  A Joules  B Joules  C x Joules  D Joules

500,000 Points  Kilocalories  joules (if you burn 34 kilocalories per minute and you exercise for one hour and 30 minutes how many kilocalories will you burn? How many joules would that be equivalent too?  A. 34 kcal, 1.28 x 10 5 Joules  B kcal, 1.28 x 10 7 Joules  C kcal, 1.28 Joules  D kcal, 128 Joules

Points  Box has a dimension of 10 m x 2 m x 3 m and filled with water – density of water is 1000 kg/m 3 – amount of calories needed to raise the temperature by 4 °C  A. 60 cal  B. 240 cal  C cal  D. 2.4 x 10 5 cal