Which of the following are metalloid elements? check all that apply. a. boron (b) b. phosphorus (p) c. silicon (si) d. tin (sn) e. lead (pb)

5g of ammonium nitrate was dissolved in 60g of water in an insulated container. the temperature at the start of the reaction was 23.0°c and at the end it was 19.0°c. calculate the energy absorbed by the reaction.

The average density of the planet uranus is 1.27 103 kg/m3. the ratio of the mass of neptune to that of uranus is 1.19. the ratio of the radius of neptune to that of uranus is 0.969. find the average density of neptune.

Energy flows from the producer level to the level. is called