Matter is -

A. destroyed by a black hole.

B. transformed but never destroyed.

C. created by the sun.

D. destroyed but never created.

How much work does the climber do on his pack if his pack weighs 90 N and he climbs to a height of 30 m? A 3 J B 270 J C 30 J D 2,700 J

At a certain temperature, the equilibrium constant, kc, for this reaction is 53.3. h2 (g) + i2 (g) â½âââ2hi (g) kc=53.3 at this temperature, 0.700 mol of h2 and 0.700 mol of i2 were placed in a 1.00-l container to react.

Hat is the percentage of water in the following compound? Answer using three significant figures. Sodium carbonate decahydrate, Na2CO3 • 10H2O

3. Describe the difference between a scientific law and a scientific theory.

Thermal pollution is caused when the temperature of lakes and rivers gets too high and fish start to die. Why do the fish begin to die?

If 420 joules of heat energy is added to 25 grams of water at 25 degrees celcius, what will be the final temperature of the water, in Celcius degrees?

What is the term for the smallest bit into which a chemical substance can be divided and still have the properties of that substance? A) electron B) atom C) molecules D) iron

What is the percent yield if 0.3 mol ba (no3) 2 and 0.25 mol na3po4 react to produce 0.095 mol ba3 (po4) 2?

A compound is a pure substance. It can not easily be broken down into parts by physical means. A) True B) False

How do you use the periodic table to find the matter, number of subatomic particles, family name, reactivity, and number of valence electrons?