A sample composed only of atoms having the same atomic number is classified as

1. A compound

2. A solution

3. An element

4. An isomer

When 2.85 moles of chlorine reacts with excess tin, how many moles of tin (IV) chloride are formed?

A polymer coating of 6:0 mm thickness is cast onto a nonporous flat surface. The coating contains a residual amount of casting solvent, which is uniform at 1.0 wt% within the coating.

A gas in a sealed container had its volume increased from 12.1 liters to 21.1 liters. and heated from 241 K to 298 K. If the original pressure was 546 torn what would be the final pressure in torr?

Write the appropriate symbol for each of the following isotopes: (a) Z = 19, A = 41 (b) Z = 46, A = 106 (c) Z = 52, A = 125 (d) Z = 38, A = 88

What is the organization that regulates the safety of Bluetooth and other wireless devices

The water level in a graduated cylinder stands at 20.0 ml before and at 26.2 ml after a 16.74 g metal sample is lowered into the cylinder. what is the density of the sample. what metal is the sample most likely to be

What are the tube feet on a star fish

What kingdom is humans in!

Propane (C3H8) has a molar mass of 132 g/mole. You started out the day with a tank containing 9071 g of propane. At the end of the day, your tank contained 7532 g of propane gas. How many moles of gas did you use?

Why decomposition of ammonium nitrate is a redox reaction?