Which are different forms of an element that have different numbers of neutrons? ions isotopes compounds molecules

Pacific Ocean mixture or pure substance?

What is the correct name for S^-2 ion? * a. Sulfite ion b. Sulfide ion c. Sulfate ion d. Sulfur ion 2. Gallium is a Group 3A metal. Which ion does Ga typically form? * a. Ga^-3 b. Ga^+3 c. Ga^-5 d. Ga^+5

When it is raining water is returning to earth as a water cycle stage called

Where is the electron located in an atom?

Tritium (half life = 12.3 y) is used to verify the age of expensive brandies. If an old brandy contains 1/16 of the tritium present in the new brandy, then how long ago was it produced

Describe a way that people might be able to solve each envioronmental problem listed below. coal mining can harm habitats and cause pollution.

A sample of methane gas occupies 4.50 gallons at a temperature of 80.0 F. If the pressure is held constant, what will be the volume of the gas at 100. degrees C?

Jack wants to know if it takes longer for warm water to freeze into ice cubes than cold water, so he performed the following experiment. Jack placed 50 mL of water in the refrigerator and allowed it to cool to a temperature of 4°C.

How to calculate average concentration

Suppose that you measure a pen to be 10.5 cm long. Convert this to meters.