Calculate the energy released by a burning sample of fuel if the temperature of 100g of water was raised by 20 degrees. 4200j/kg

What are the similarities of physical and chemical change ?

Why is carbon ideal for making different compounds?

What is a main difference between a mixture and a pure substance? a mixture is only a liquid, but a pure substance can be in any state.a mixture looks the same throughout, but a pure substance does not.1 a mixture can vary in composition, but a pure substance has a set composlo a mixture can be made up of a single compound, but a pure substance car