HELP ME ASAP Chemical reactions occur around us every day. Combustion of hydrocarbons releases the carbon stored in fossil fuels (e. g. coal, oil, natural gases) into the atmosphere as carbon dioxide gas. Which of the following equations represent this process?

An unknown insoluble substance displaced the water shown. it's mass is indicated on the triple beam balance. mass = a. 694 b. 693.5 c. 693.0 d.693.8

You have a sample of a metal, the sample is exactly 6.02 x 1023atom, if the sample has a mass 55.85 what metal is your sample made of?

An engineer decides to use a slightly weaker material rather than a stronger material, since she knows that the stronger material can break suddenly. this is an example of what? a choosing a material that will show warning before it fails b using composite materials that combine strength c using a material for multiple applications d using design techniques that increase efficiency and reduce cost