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Posted by on Wednesday, September 24, 2008 at 9:12pm.

OMG, I did the other fifteen questions of my homework but I'm stuck on these.

#1: Which has the higher average kinetic energy, a tub full of 50'C water, or a small cup of 52'C water. Why?

Which has more total kinetic energy, the tub or the cup? Why?

#2: Lithium, sodium, and potassium all react violently with water. Knowing this, and looking at the periodic table, would you expect cesium to react violently with water as well? Explain why or why not?

#3: What is a periodic trend?

Using the concept of periodic trend, which is larger in size: an atom of cesium (Cs) or an atom of astatine (At)?

#4: You hold a potato chip motionless in your hand above the ground.

What kind of energy does the potato chip have based on its position?

You drop the potato chip. What kind of energy does it have as it falls?

How would you release the chemical potential energy inside the potato chip?

The potato chip has 10,000 calories of chemical potential energy. How many joules does it have?

#5: You have an irregularly shaped rock. How can you find its volume?

You discover that the volume of the material is 150 mL. Its mass is is 1701g. What is its density?

  • Chemistry - , Wednesday, September 24, 2008 at 9:24pm

    We will be happy to critique your thinking.

  • Chemistry - , Wednesday, September 24, 2008 at 9:49pm

    Eh, sorry. ^^;

    I'm really bad at chemistry.

    #1: (I don't get the first part) The cup because the water is higher in temperature.

    #2: No, it is very soluble in water

    #3: They are the tendencies of certain elemental characteristics to increase or decrease as one progresses from one corner of the Periodic table of elements.

    #4: (I really don't understand this...??????????)

    #5: ( Nor do I get this one. )

  • Chemistry - , Wednesday, September 24, 2008 at 10:05pm

    1. the cup has higher temp, and temp is a measure of average KE. The tub has more heat energy (more mass).
    2. Your answer is not logical, the question is about reactivity. Cs is the most reactive of all metals.
    3. Not exactly. Look this up in the text, and see the trends on atomic size to answer the At question.
    4. Kinetic energy is the energy of moving. To get the chem energy, you could burn it. 1joule=4.1calories
    5. Look up the term displacement in your text. Density = mass/volume

    If you are serious on not understanding these elementary concepts, you need a tutor , or drop chemistry.

  • Chemistry - , Wednesday, September 24, 2008 at 10:11pm

    Well I just started Chemistry...Monday. I'm home-schooled and only have teachers from nine in the morning to noon. And I payed $50 for this course.

    Okay, I'll re-read the chapter to see if I understand anything.

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