40 ! need !
what are five common phase changes of matter?
1- solid
2- liquid
3- gases
4- plasma
5-

what are some common chemical properties of matter?

how do you recognize substances that have gone through physical or chemical changes?

how do natural processes represent physical or chemical changes?

how is understanding reactivity for making jewelry?

what is toxicity? give an example of something from your home.

what is flammability? why do builders avoid using flammable materials in homes?

what is the difference between flammability and heat of combustion?

what are some natural processes that represent physical and chemical changes?

what are the differences between a physical change and a chemical change?

list the four examples of physical changes. why are these physical changes?

list the four examples of chemical changes. why are these chemical changes?

what happens to the mass of substances during a physical change?

explain in your own words what the law of conservation of mass means.

what is a scientific law? how does a hypothesis become a law?

what happens to the mass of substances during a chemical change?

how does the creation of oil demonstrate conservation of mass?

how do you know when a chemical reaction has taken place?

what are reactants and products in chemical reactions?

how does melting and burning sugar follow the law of conservation of mass?

if two or more elements or chemical compounds come into contact with one another and there is enough present, a chemical change may take place.
when a substance undergoes a chemical change, the chemical of that substance is altered.
a chemical change can also be called a chemical

during a chemical reaction, a new is formed.

when two compounds or molecules react together to form new substances, they are called

the new substances created, plus any resulting ash, water vapor, or carbon dioxide, are called because they are produced by the reaction.
it is important to carefully examine chemical reactions because there are many ways substances can be without a chemical reaction taking place.

what happened when bromine reacted with aluminum?

what happened when the solid sulfur was melted?

when water vapor is cooled, it re-forms into water droplets. why does this represent a conservation in mass?

what is thermal energy? give an example.

how does adding thermal energy influence a chemical change?

how do diagrams, sketches, or drawings scientists understand concepts better?

which phase changes are exothermic?

which phase changes are endothermic?

what happens in an exothermic reaction?

what happens in an endothermic reaction?

what are the benefits of using repeated trials and replication in a scientific investigation?

how are trials used in an experiment?

how does replication work?

what is a scientific model? how is a scientific model to the brain for relaying a scientific concept?

what are two observations you made from viewing the solar system model?
how do diagrams, sketches, or drawings scientists understand concepts better?

in your own words, explain what two-dimensional (2-d) and three-dimensional (3-d) models are. give an example of one you've seen recently.

what is a simulation? why are simulations to scientists?

explain in your own words what an infographic is.

what is a map? how are maps used, and what is their purpose?

what are graphs? give an example of a graph that would be useful to you in your everyday life.