A closed system is:

completely closed to the outside environment.

only slightly exposed to the outside environment.

in constant exchange with the environment

completely exposed to the outside environment.

Sixty miles/hour is how many ft/sec

How does a physical property change without causing a change in the substance, such as mass and texture?

10. In what part of the world might you find Mystery Island (note: you will be given full-credit for simply attempting this question and you will find the actual answer in your teacher's feedback). Do not answer!

Which of the following is not a significant threat to the worlds' rainforest? a. grazzing b. logging c. agriculture d. shipping

Convert 44 centimeters to meters. A. 4 m B. 4.4 m C. 0.44 m D. 0.044 m

Calculate the acid dissociation constant of a weak monoprotic acid if a 0.5M solution of this acid gives a hydrogen-ion concentration of 0.000 1M? Show your work.

Which orbital notation represents a noble gas in the ground state

c. When we heat water up by the Bunsen burner, what temperature is the boiling water? After 10 minutes

Assuming that air contains 78 percent N2, 21 percent O2 and 1 percent Ar, all by volume. How many molecules of each type of gas are present in 1.0 L of air at STP?

Two children are playing tag. Child A who is doing the chasing can run 100m in 24 seconds Child B is running away from child A and can run 64m in 21 seconds.