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.

Describe the changes in properties (from metals to nonmetals or from nonmetals to metals) as we move (a) down a periodic group and (b) across the periodic table from left to right.

What type of energy is converted when fireworks relese heat, light, and sound

A student requires 0.380 moles of NaCl that has a concentration of 0.750M. How many Liters of the solution should be used?

Which relationship is the BEST example of the Law of Supply? A) The quantity of a good supplied rises as the price rises. Elin The quantity of a good supplied rises as the price falls. C) The quantity of a good supplied falls as the price rises.

Prokaryotic and eukaryotic cells are alike because ...

What type of change is a substance that changes form but remains the same?

Which side of the mountain experiences high temperature in windward or leeward

How does light pollution affect plants and animals? Light pollution harms plants and animals because they confuse it with

In what ways are polyatomic ions like simple ions

How does oxygen obey the octet rule when reacting to form compounds? A) It gains electrons. B) It gives up electrons. C) It does not change its number of electrons. D) Oxygen does not obey the octet rule.