Which two systems are represented in this model?

A
circulatory and respiratory

B. nervous and circulatory

C. excretory and respiratory

D. nervous and digestive

6. what does the symbol ah stand for? o one calorie given off by a reaction the specific heat of a substance the heat capacity of a substance the heat of reaction for a chemical reaction

What mass of natural gas (ch4) must you burn to emit 276 kj of heat?

A1.5l container holds p.50 grams of an unknown gas at a pressure of 0.44 atm and a temperature of 50.c what is the molar mass of the unknown gas