Which is an example of a double-replacement reaction?

Balance: __ N2 + __ H2 → __ NH3

Balance: __ Fe + __ O2 → __ Fe2O3

Typical ionic charge of a Group 6A (16) element is:

Nitrogen commonly forms which simple anion?

Balance: __ Al + __ HCl → __ AlCl3 + __ H2

What is the best example of a heterogeneous mixture?

A sample has a mass of 27.0 g and a volume of 9.0 mL. Using the density equation (D = m/V), calculate its density to the appropriate amount of significant figures.

Clouds usually form in areas of low pressure because:

Drumlins are glacial landforms that show: