4. Which of the following is NOT a synthetic element
1-Tc
2-Np
3-Pu
4-U

Marcel just purchased 1.69 grams of iron fillings in order to make living putty for his 6 year old niece. how many moles of iron are made in his sample?

Under normal conditions, describe how increasing the temperatures effects the solubility of a typical salt

Alidded glass container is filled with a colored gas. after a period of time, it is observed that the gas is uniformly spread throughout the box and that the movement has slowed considerably. next, a warm iron plate is carefully placed under the box. why is there resumed movement of the gas in the container?