The closeness of a measurement to its actual value is a measure of its

A. usefulness.

B. reproducibility.

C. precision.

D. accuracy.

When a substance changes from one phase to another, which of the following occurs? A. The substance loses or gains heat. B. The average kinetic energy of the substance changes. C. The temperature of the substance changes. D.

What are some examples of chemical changes?

Which gases enters ocean water from organisms that photosynthesize? A. carbon B. nitrogen C. hydrogen D. oxygen

SbF5 mass ratio and atomic ratio

What family has the most reactive metals give an example (symbol and name)

One light year is about 9 trillion kilometers. Arcturus is a star that is 37 light years from earth. If you are about 11 years old now, how old will you be when light that is leaving Arcturus today reaches earth?

What is melted rock and minerals found below earths crust

What do many bases have in common? A. They often release oxygen gas. B. They often form hydrogen ions. C. They often release hydrogen gas. D. They often form hydroxide ions.

What is 3 tenths+4tenths

A lunar eclipse can only occur at which lunar phase? And what about a solar eclipse?