The half life of radon-222 is 3.8 days. How much of a 100 gram sample is left after 15.2 days?

Which shows the formula for an organic acid? CH3CH2COOH H2CO3 NH3 CH3OH

A student writes the following explanation of how certain molecules are formed. A process is used to chemically link smaller units to form a larger molecule that is made up of repeating units.

The density of HCN (hydrogen cyanide) gas at STP is 1.21g/L. What volume will 100.0g of HCN occupy at STP? A) 121 L B) 0.012 L C) 82.6 L D) none of the above

A solution that contains a small amount of salt and a large amount of water is said to be a? A. saturated B. concentrated C. monounsaturated D. Dilute

If the heat capacity of an object is known what other information will need to be known to calculate its specific heat capacity A. It's temperature B. It's volume C. It's energy D. It's mass

Write the net ionic equation for the chemical reaction shown. Include physical states. HClO2 (aq) + NaOH (aq) ⟶H2O (l) + NaClO2 (aq)

Which if the following is an example of a stratovolcano?

There are five elements named for famous scientists on the periodic table

What character acids is that they react with metals to

The energy of a particular color of green light is 3.81*10-22 kJ/photon. The wavelength of this light is nanometers