What is the percent by mass of carbon in carbon dioxide (CO2)? A. 27%
B. 33%
C. 43%
D. 73%

If you add 10ml of hot water to 10ml of cold water and the change in tempature 8°c calculate how much energy is gained by the cold water

Write the chemical formula for a compound that is made of an element from group 1 and an element from group 17

Ammonium perchlorate nh4clo4 is the solid rocket fuel used by the u.s. space shuttle. it reacts with itself to produce nitrogen gas n2 , chlorine gas cl2 , oxygen gas o2 , water h2o , and a great deal of energy. what mass of nitrogen gas is produced by the reaction of 2.1g of ammonium perchlorate?