Question

Help!!!!!!!!!!!!!!!!

Answer 1

A chemical change is when one substance combines with another and creates a new one, or when one chemical becomes two. An example would be when two hydrogen come together with an oxygen, they can create h2o, or water, which is different from both prior elements.

Physical changes are when a general shape is distorted from an original form into another. For example, when you rip a piece of paper, the paper has had a change to its form and possibly its mass.

The law of conservation of mass is that in a completely isolated system, matter can't be made or destroyed, similar to energy (bit of foreshadowing for other lessons). An example is when you burn wood. it creates smoke, and ashes, but under a closed system. those two products together are the same mass as the fire, energy was simply applied to change its form.

Answer 2

A chemical change is when 2 substances combine to form a new substance. An example of this could be: sodium+chlorine=sodium chloride, or table salt.

A physical change is when the appearance or form of a substance is affected, but it’s chemical substances have not been changed. An example of this would be: chopping a log in half.

The Law of Conservation of Mass is the rule which states that mass cannot be created or destroyed. An example of this would be: it is impossible to make a glass of water appear into my hand out of thin air, the same with it disappearing into thin air.

(I loved 6th grade chemistry class. It was my favorite)