(15 points)consider the physical properties (such as size, magnetism, ability to boil or dissolve in water) of each sand, gravel, salt and iron filings. how would you go about separating the components of a mixture of them?

Which of the following nuclei would be the least stable a 2 protons, 2 neutrons b 1 proton 1 neutron c 1 proton 3 neutrons d 1 proton 2 neutrons

Which of the following statements is true about energy quantization at the atomic level? electrons in the outermost orbits are the most stable. electrons in all the orbits around the nucleus have the same amount of energy. electrons in the orbit closest to the nucleus have the least amount of energy. electrons absorb or release the same amount of energy independent of the energy levels.

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