4. Write your observation and conclusion for the following:
(a) When few marbles are put in a glass half
filled with water.
(b) Ice is kept at room temperature.​

Which of these best describes an ionic bond?

Calculate the temperature rise when 0.2g of propane is used to heat 400cm cubed of water.

If you try to move a piano and are unable to move it, did you perform any work in the scientific sense of the word? yes? or no? this question is worth 20 points! let it be correct!