Metals, Nonmetals, Metalloids
Describe two things about a metal?
shiny, conductors, malleable, ductile
How do we know a physical change has occurred?
What is an element or pure substance?
The most pure substance that cannot be broken down any further.
What side of the periodic table are the nonmetals located?
A) left side of the step ladder
B) right side of the step ladder
C) along the step ladder
B) right side of the step ladder
How do you know a chemical change has occurred?
What is a compound?
consists of two or more different elements
Describe the two main characteristics about metalloids?
semiconductors, fragile (break easily)
During recess, a student dropped their popsicle on the hot concrete. After a few minutes the popsicle began to melt. Is this an evidence of a physical or chemical change?
physical
Is gold an element or a compound?
Element
Is the element Boron (B) a metal, nonmetal, or metalloid?
Metalloid
A student mixed a white liquid with a clear liquid. After waiting 30 seconds, the student noticed that a white solid formed. What evidence of a chemical reaction has occured?
a precipitate formed
Is water (H2O) an element or compound?
compound
Is the element Sodium (Na) a metal, nonmetal, or metalloid?
Metal
What are the 5 evidences that a chemical change has occurred?
precipitate, energy change, order (smell), unexpected color change,
Is carbon dioxide (CO2) an element or compound?
compound