summative #1 Flashcards
elements have…
Melting and boiling points
elements are grouped based on
level of reactivity
to the left of the zigzag line are
metals
on the zigzag line are
metalloids
to the right of the zigzag line are
nonmetals
in the very far right group there are
noble gases
exist primarily as elements and will not form compounds
non reactive gasses
malleable, have high melting and boiling points, are usually solid at room temperature are good conductors of heat and electricity.
metals
poor conductors of heat and electricity, usually gases at room temperature, as solids they are dull and brittle
nonmetals
what is a mixture
A mixture is 2 elements that are physically combined and can be separated by physical means.
examples of mixtures
trail mix
why are chemical and physical changes not discrete and why there is no specific line between the two
with chemical changes there is always!!! a new substance being formed, but with physical there is never!!!! a new substance formed
what is a chemical change and give 1 example and 3 signs
A chemical change is a change where a whole new substance is forming. One example would be seeing a firework. 3 signs that a chemical change has occurred would be odor production, formation of a solid, and bubbles forming.
what is a physical change and give 1 example and 3 signs
A physical change occurs when there is no new substance being formed. One example would be water freezing in to ice. Three signs would be change in state of matter, change in luster, and change in density.o
Signs that either a physical of chemical change has occurred would be (2)
Chane in color or temprature
