Which event is endothermic?

a) the burning of a match

b) the change of water vapor to a liquid

c) the combustion of propane gas

d) the melting of ice

For the chemical reaction 2HCl+Ca (OH) 2--->CaCl2+2H2O What mass of CaCl2 is made from 3.59 mol HCl?

How do levels of carbon dioxide in ocean water compare to those of air?

1.00-degree increase on the Celsius scale is equivalent to a 1.80-degree increase on the Fahrenheit scale. The temperature of a fluid increases by 48.0°C. What is this increase in degrees Fahrenheit? 49.8°F 48.0°F 26.7°F 86.4°F

A period is a horizontal row on the periodic table. a. True b. False

The total pressure of a gas mixture in a particular container is 43.2 atm. The Flask contains 2.87 mol of argon, 7.40 mol of chlorine and 15.2 mol of xenon. Determine the partial pressure of each gas.

Solid iron has a density of 7.9 g/cm3. Liquid mercury has a density of 13.6 g/cm3. will iron float or sink in mercury explain

Convert 6.42 moles of H2O to molecules

An aspirin tablet contains 81.0 mg of aspirin, which has the molecular formula, c9h8o4.

What size container do you need to hold 0.0459 mol of N2 gas at stp

What happens when two or more atoms react?