2. Matter homework problems (Chemistry)

Name and date submitted (3 pts):

Instructions: Create space in the Word document below, and write or type your answers. Turn in your completed work as an email attachment.

(20 questions with 1 extra credit question. 100 points + 10 extra credit possible).

Deductive (logical) reasoning:

1. Chuck reads anything Sally chooses to read. Tom reads what Chuck chooses to read and Chuck reads what Tom chooses. Sally reads whatever Darlene chooses to read. a. Chuck is reading Animal Farm by George Orwell. Who else, if anyone, must also be reading

Animal Farm? b. Exactly three people are reading Mere Christianity by C.S. Lewis. Who are they? Explain.

Matter & Energy:

2. State the operational descriptions of matter and energy.

3. Tell whether each of the following processes involves a chemical change, a physical change, or both.a. Iron rustsb. Molten aluminum solidifiesc. Sugar dissolvesd. Water freezese. Water is split into hydrogen and oxygenf. Wood burnsg. A wafer of silicon being scored and cut

into chips to be used in computer microprocessors

h. Dynamite exploding and the resulting collapse of an old building

i. A burning candlestick melting wax

4. States of Matter:Write the correct description next to each phase change in ‘a – e’ below. Choose from this list:

CondensationEvaporationFreezingMeltingSublimation

a. Solid to liquidb. Liquid to gasc. Solid to gas

d. Gas to liquide. Liquid to solid

5. Classify each of the following as an element or compound. a. Oxygen (O2)b. Carbon monoxide (CO)c. Ozone (O3)d. Helium (He)e. Methane (CH4)f. Hydrogen peroxide (H2O2)

The next 3 are short essay questions. Research the chapter and the Internet and write 1-2 paragraphs on each question, below. USE COMPLETE SENTENCES.

6. Man’s first flying machine was the hot air balloon. Explain how a hot air balloon works. Why does a helium balloon rise even though the gas is not hot?

7. Why is the cooking time (listed on the package) for some foods dependent upon the elevation you’re at?

8. What is the difference between evaporation and boiling?

Multiple choice questions:

9. Only solids havea. High compressibilityb. Low densityc. Definite shaped. High-speed particles

10. The kinetic energy of a particle (atom or molecule for example) is directly related to itsa. Densityb. Temperaturec. Volumed. Pressure

11. What happens to the pressure of a gas when it is heated?a. Decreasesb. Increasesc. Remains the samed. Depends on which gas

12. Whey do solids keep their shape? a. The molecules move too fast

b. The molecules are locked in placec. The molecules are still touchingd. The molecules diffuse

13. The thickness of a liquid is itsa. Densityb. Viscosityc. Liquidityd. Mass

14. How does the thickness of most liquids change as they heat up?a. Less thickb. More thickc. No change

15. You may have noticed that when water boils, you can see bubbles that rise to the surface of the water. What is inside these bubbles?a. Airb. Hydrogen and oxygen gas from the H2Oc. Oxygen gas from the H2Od. Water vapore. Carbon dioxide gas

Temperature conversions:

16. Convert the following temperatures from the scale given to the scale indicated in parentheses. Report your answer to the nearest tenth of a degree. YOU MUST SHOW YOUR CALCULATIONS TO RECEIVE CREDIT. Yes, you may check your answers using the Internet. a. 300.0 K (°C)b. -115.53 °C (K)c. 100.0 K (°C)d. 38.5 °C (K)e. 212.0 °F (K)

Energy conversions:

17. Convert the following quantities of energy from the unit given to the unit indicated in parentheses. You can consult the Appendix in your book (or the inside book cover) for the necessary conversion factors. YOU MUST SHOW YOUR CALCULATIONS TO RECEIVE CREDIT. You may check your answers using the Internet. a. 157 J (cal)b. 3700 BTU (J)c. 153 Cal (J). Be careful with this one. d. 7.89 x 108 J (BTU)

Lab question:

18. Suppose some iron filings (Fe) and powdered sulfur (S) are placed together in a metal beaker. a. Would this constitute a mixture or a pure substance?b. Suppose the iron and sulfur are heated so they react with each other, forming iron sulfide

(FeS). Would this still be a mixture? Why or why not?

The next 2 are review questions. SHOW ALL YOUR WORK TO RECEIVE CREDIT.

19. Congratulations! You and your spouse are the proud parents of a new baby, born while you are studying in a country that uses the metric system. The nurse has informed you that the baby weighs 3.91 kg and measures 51.4 cm. Convert your baby’s weight to pounds and ounces and her length to inches (rounded to the nearest quarter inch.)

20. The circumference of the earth is 25,000 mi at the equator. a. What is the circumference in kilometers? b. In meters?

Extra credit:

21. If the starship U.S.S. Enterprise is traveling at warp factor 1.71, what is its speed in miles per hour? (Warp 1.71 = 5.00 times the speed of light; speed of light = 3.00 x 108 m/s).SHOW ALL YOUR WORK. If you have never watched a Star Trek movie, the speed of the Enterprise is always given as “Warp speed”.