Elements and compounds
Cannot be broken down into anything else
Element
Tearing a piece of paper is a physical change because….
You didn’t make a new substance, you still have paper.
If a gas is produced… what might happen that you can see?
Bubbles, fizzing
Elements that have a shiny luster are
Metals
Identify all of the elements in the list and tell the class how you knew
C, O, Ne, H2O, H2O2, Fe, Al4Si
C, O, Ne, Fe
Which one is a chemical change?
Ripping
Melting
Burning
Tearing
Burning
Select the signs that a new substance was produced from the list.
Change in size
Unexpected color change
A new odor is produced
A precipice forms
Unexpected color change, precipitate forms, new odor is produced
Tell the class the conductivity of metals, Nonmetals, and Metalloids
Metals - conductors
Nonmetals- insulators
Metalloids - semiconductors
What is represented by chemical formulas?
Compounds
You know a chemical change has happened when -
A new substance is formed
List all 5 signs that a new substance is produced
Color change
Produce gas
Produce precipitate
Produce light
Change in temp
Identify all of the descriptions of an element that is malleable
Bends without breaking
Can be hammered into thin sheets
Breaks when you tap it on the table
Can be melted and poured into a mold
Can turn into a powder
Bends, hammered into sheets, melted
Count how many elements are in the following compound.
Al4CO2FeH2KSi
7
Choose all that are chemical changes
Wax melting over a flame
Wood burning in a fire place
Car rusting in the rain
Pouring soda into a glass
Wood burning, car rusting
Which of the following is evidence of a chemical change?
Blue paint is mixed with yellow paint to make green paint
Purple powder is mixed with clear liquid and the liquid turns light purple
A blue liquid is mixed with a clear liquid and the liquids turn pink
Pink crystals are added to a clear liquid and the liquid turns light pink
A blue liquid is mixed with a clear liquid and the liquids turn pink
State the location of metals Nonmetals and Metalloids on the periodic table
Metals left
Nonmetals right
Metalloids middle
Give a definition for the following words
Atom
Element
Compound
Atom - smallest particle
Element - made of the same type of atom throughout, represented by symbols
Compounds - made of two or more elements, represented by formulas
Identify the word that does NOT represent a chemical change
burn, ferment, Rot, Ripen, cook, stir, bake, fry
Stir
Give real-life examples for each of the 5 signs of a chemical change.
Color - leaves turning, mixing two clear liquids to get pink, banana rotting
Gas - baking soda and vinegar
Light - glow sticks
Temp change - baking soda and vinegar
Precipitate - milk and vinegar
Name at least 2 elements that are metals, 2 Nonmetals, and 2 Metalloids
Metals - iron, gold
Nonmetals - sulfur, carbon
Metalloids - silicon, arsenic