Which of the following substances would lose its heat the fastest?
A Lead, 0.129 J/g C
B Mercury, 0.14 J/g C
C iron, 0.45 J/g C
D zinc, 0.388 J/g C

Consider the nuclear equation below. 239 > x + 4 he 94 2 what is x? 1.235 cm 96 2.243 u 92 3.235 u 92 4.243 cm 96

Elements in group 2 are all called alkaline earth metals. what is most similar about the alkaline earth metals?

Sandy is building a small toy car. he wants to use a balloon to power the toy car. he fills a balloon with air and then attaches a straw to the balloon. he tapes the balloon-straw combination to the car and then releases the end of the balloon. the toy moves forward as the air from the balloon comes out the back of the straw. what can sandy do to make the toy car move faster? a) use less air in the balloon. b) blow up the balloon more. c) use a longer straw. d) use larger tires.