Question 7

10 pts

Choose all of the physical changes:

(There are FOUR)

melt

tarnish

evaporate

explode

react

disslolve

bend

A gas occupying a volume of 25 ft3 weighs 3.5 lbf on the moon, where the acceleration of gravity is 5.47 ft/s2. determine its weight, in lbf, and density, in lb/ft3, on mars, where g = 12.86 ft/s2.

Which part of an experiment do scientists change the independent or dependent variable?

What are explosives made up of

How might cancer of testes affect a man's ability to make sperm

Provide the mass number of Fe, which has 29 neutrons

The reaction of C4H8 and Br2 to yield C4H2Br2 represents

Which of these is the strongest acid? acetic acid chlorous acid nitrous acid propionic acid

Ethyl alcohol has a heat of vaporization of 850. J/g. What mass of ethyl alcohol can be boiled using 15000 J of energy?

How many significant figures are in the measurement 40,500 mg? a) two b) three c) four d) five

What is the earth thinnest layer?