Tell how many significant figures this number contains:

18.20

Most air pollution come from a) pollen b) forest fires c) volcanic eruptions d) burning fossil fuels

Why Ammonia is nut dried by passing through concentrated H2SO4.

At a pressure of 782.3 mm Hg and 34.4 °C, a certain gas has a volume of 362.4 mL. What will be the new volume of this gas under STP?

When 0.250 moles of a gas is placed in a container at 298K, it exerts a pressure of 0.92 atm. What is the volume of the container? PV = nRT R = 0.0821 L·atm/mol·K options: 0.12L 0.55L 6.6L 8.3L

Which structure is found in plant cell but not in an animal cell? A) cell wall B) cell membrane C) cytoplasm D) nucleus

1. How is pressure affected as depth increases? 2. As the sun heats the surface of the oceans, two layers of water result. What separates the layers? 3. How is temperature affected when? (a) the depth increases (b) the latitude increases 4.

Are nails in a jar with water a chemical change

What is the molarity of a solution composed of 4.73 g of potassium iodide (KI) dissolved in enough water to make 0.169 L of solution? Answer in units of M.

Suppose you were given a substance and asked to determine whether or not it was a plasma. Write the characteristics you would look for to identify the substance.

What is a comet? tell in a short and easy answer