States of Matter
What are the three states of matter?
Solid, Liquid, and Gas
What kind of change is dissolving the sugar coating on candy?
Physical
How many atoms are in the molecule H2O
3
Is this chemical equation balanced?
2Li + 2F2 -> 2LiF
NO
Should only be 1 molecule of F2
Is the chemical equation balanced?
2H2 + O2 -> 2H2O
YES!
What state of matter is oxygen and propane at room temperature?
Gas
What kind of change is burning a candle
Chemical
How many molecules are in the atom SeCl6
7
Is this chemical equation balanced?
S8 + 8O2 -> 8SO2
YES!
What are the products in the following chemical equation?
6NaH + 2BF3 -> B2H6 + 6NaF
B2H6 AND 6NaF
What state of matter is made of molecules that are slightly apart and slide past each other easily?
Liquid
Which is showing a physical change?
Burning wood
Chopping up wood
Chopping wood
How many atoms are in the molecule C2H4O2
8
What are the reactants in the following chemical equation?
2Al + Fe2O3 -> 2Fe + Al2O3
2Al + Fe2O3
When molecules in a liquid LOSE energy (or their temperature DECREASES) what state of matter does it turn into?
Solid
What is it called when a liquid turns into a gas?
Evaporation
What is showing a chemical change?
Baking soda and citric acid
Coke and mentos
Baking soda and citric acid
How many atoms are in the molecule KHCO3
6
What does the law of conservation of mass state?
"Nothing can ..."
Nothing can be created or destroyed (it just rearranges into something new!)
How many atoms are in the molecule Na2CO3?
6
What does condensation mean?
"______ turns into ______"
Gas turns into liquid
Write down one way you can create a chemical change AND one way you can create a physical change to a piece of paper
Physical - rip it in half/draw on it/cut it
Chemical - Burn it
How many atoms are in the molecule Al(OH)3
7
Is the following chemical equation balanced?
4CrO3 -> Cr2O3 + 3O2
NO - 2Cr2O3
Is COOKING an egg a chemical or physical change?
Chemical (the egg whites' chemical makeup changes!)