Design a special effect in which an object is suspended in a liquid. Consider the density of the material you will suspend and the density of the liquid you will use. Show the calculations that you used to make your choice of materials.

In a sample of oxygen gas at room temperature, the average kinetic energy of all the balls stays constant. which postulate of kinetic molecular theory best explains how this is possible? a. attractive forces between gas particles are negligible because the particles of an ideal gas are moving so quickly. b. collisions between gas particles are elastic; there is no net gain or loss of kinetic energy. c. gases consist of a large number of small particles, with a lot of space between the particles. d. gas particles are in constant, random motion, and higher kinetic energy means faster movement.

Write the chemical symbols for three different atoms or atomic cations with 27 electrons. asap!

Which compound contains both ionic and covalent bonds? a) hbr b)cbr4 c)nabr d) naoh