PLEASE ANSWER: Students will identify that an electromagnet is controlled with an electrical charge from the battery. Students can take this in 2 different, yet correct directions. 1. They can determine that the battery is not functioning, therefore cannot power the motor, or that there is a malfunction within the motor causing the electromagnet to lose strength. If they do not mention either of these, then encourage them to look at the diagrams and think about what could cause the system to not function correctly.

absorption lines are where light has been absorbed by the atom thus you see a dip in the spectrum whereas.

emission spectra have spikes in the spectra due to atoms releasing photons at those wavelengths.

explanation:

answer: 802.3 kilo joules of energy represents 191.75 kilo calorie of energy.

explanation:

energy released during combustion of one mole methane = 802.3 kilo joules

if 1 kilo joule = 0.239006   kilo calorie

then ,802.3 kilo joule will be = 802.30.239006 kilo calorie

802.3 kilo joule = 191.75 kilo calorie

hence, the energy in kilo calorie is 191.75 kilo calorie.

molecules are free to separate from each other and will take on the shape of the container. molecules move completely at random and high speeds. they vibrate in a fixed position and do not move around much. molecules expand to the edge of their container.