How many electrons in 0-2?

What dose it mean to say that mass is conserved during a physical change?

What happens when you touch cold ice with your warm hand? a. heat only transfers from the ice to your hand b. heat only transfers from your hand to the ice c. heat transfers from the ice to your hand and from your hand to the ice d. heat does not transfer between the ice and your hand

Is Jacinth non silicate or silicate?

In Hooke’s law, what does k represent? A. the distance the spring stretches

B. the elastic constant, a number that tells the relative strength of the spring

C. the constant of gravity

D. the amount of force acting on the spring

Three of the primary components of air arecarbon dioxide, nitrogen, and oxygen. In a
sample containing a mixture of only these
gases at exactly one atmosphere pressure, the
partial pressures of carbon dioxide and ni-
trogen are given as Pco, = 0.285 torr and
PN = 634.034 torr. What is the partial pres-
sure of oxygen?
Answer in units of torr.

Another gas was used for many years to float transportation balloons. WHICH GAS IS IT:

1) Carbon dioxide
2) Oxygen
3) Hydrogen

Why is this gas not used in balloons today?