To create an isotopeof a certain element, you must vary a number of:

A. atoms

B. neutrons

C. protons

D. electrons

D=3g/ml v=100 ML m=?

How do I seperate a mixture of iron filings, salt, sand, and wood chips?

Windows are often a source of heat loss during the winter. The use of double panes, where there is a gap filled with gas between window panes, can lower heat losses.

Rainwater has a ph below 7 because raindrops absorb co2 which can react with water to form carbonic acid.

How does a sample of helium at 15 degree Celsius compare to a sample of helium at 215 K? A) The helium at 15 degrees Celsius has a higher average kinetic energy that the sample at 215 K.

Electric force is an A. attraction and repulsion between protons and electrons . B. attraction and repulsion between protons and neutrons. C. attraction and repulsion between neutrons and electrons.

A salt crystal has a mass of 0.18 mg. how many nacl formula units does it contain?

Which of the following is easist to accelerate? A. bowling ball B. tennis ball C. golf ball D. ping pong ball

Fish need at least 4 ppm dissolved o2 for survival. part a what is this concentration in mol/l?

How does a runoff get polluted.