What are four indications that a chemical reaction bay be taking place

Three elements have the electron configurations 1s22s22p63s1, 1s22s22p63s2, and 1s22s22p5. The first ionization energies of these elements (not in the same order) are 1.681, 0.738, and 0.496 MJ/mol. The atomic radii are 160, 186, and 64 pm.

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Which of the following has the smallest bond dipole? a. C-H b. C-F c. C-Si d. C-C

An 80.0g sample of an unknown metal is at an initial temperature of 55.5oC. Afer 540 J of energy is absorbed by the metal, the temperature of the metal increasese to 81.75oC.

A car travels 66 kilometers in 3 hours. what is its speed

Fish breathe oxygen, o2, dissolved in the water. since water is a polar substance and oxygen is a nonpolar substance, how can there be any oxygen, o2, in the water?

Barium carbonate, baco3, is stable at ambient temperatures, but decomposes to barium oxide and carbon dioxide at higher temperatures.

How do an isotope and a radioactive isotope differ?

What is a cause of polarity in water molecules?

Which is the force of attraction that holds atoms together? A. gravity B. friction C. physical bond D. chemical bond