Rachel burns a 53 gram cracker under a soda can filled with 68.7 grams of water. She took the temperature of the water before she began -- it was 5.5 degrees Celsius. After the cracker was done burning, the temperature of the water was 73.1 degrees Celsius. How many calories of heat were released by the cracker? Round your answer to one digit after the decimal point.

The two naturally occurring isotopes of chlorine are 35cl (34.969 amu, 75.77%) and 37cl (36.966 amu, 24.23%). the two naturally occurring isotopes of bromine are 79br (78.918 rm amu, 50.69%) and 81br (80.916 amu, 49.31%). chlorine and bromine combine to form bromine monochloride, brcl. 1. how many peaks will be present in a mass spectrum for brcl? the four combinations of molecule possible given these four isotopes are: 81br37cl, 81br35cl, 79br37cl, and 79br35cl. 2. what are the masses of the four different brcl molecules? express the masses using six significant figures, in decreasing numeric order (highest to lowest), separated by commas.

Ahypothesis must be testable and falsifiable to be considered scientific a. trueb. false

1. true or false: minerals are inorganic. true false 2. inorganic means that something has never been found alive 3. halite is another name for and is a mineral with a cubic crystal pattern. table salt rock salt