Transcript Study Guide Answers

Chemistry
Study Guide Answers
Metals on the left of the staircase
Nonmetals on the right
Name 3 metals
Name 3 nonmetals
Name a metalloid
Atomic number
• Tells # of protons
• Tells # of electrons
atomic # 11
atomic mass 23
» 11 protons
» 11 electron
» 12 neutrons
» 2 electrons 1st ring
» 8 electrons 2nd ring
» 1 electron 3rd ring
»
copper
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Symbol Cu
Protons 29
Electrons 29
Neutrons 64-29=35
• Atomic mass is 63.546
Sulfur
Helium
Malleable
• Hammered flat
• Metals are malleable
Ductile
• Pulled into wire
• Metals are ductile
Luster
• Shiny
Brittle
• Easily shattered
Dull
• Not shiny
Conductor of heat
• Metals carry heat and electricity from
place to place
Oxygen O
Colorless
Odorless
Tasteless
Flammable
Fuels a fire
Hydrogen H
Colorless
Odorless
Tasteless
Explosive in fire
Makes a “popping” noise
In fire
Carbon Dioxide
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Colorless
Odorless
Tasteless
Dense
Puts out a fire
CO2
Changes in Matter
Physical Change
• Can be reversed
• No new material created
• Phase change
Chemical Change
• Cannot be reversed
• New substance made
• One or more of the following occur:
* color change
* temperature change (hotter or colder)
* gas produced ~ bubbles
* new odor
Water freezing to ice
Physical change---can melt back to water
Salt dissolving in water
• Physical change--can be separated if water evaporates
Iron rusts
• Chemical change
• New color, odor
Sour Milk
Chemical
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Odor change
Taste change
New chunky substance made
Cant turn back to milk
Element
P U Re
hosphorus
ranium
S U B S Ta N Ce
ulfur
ranium
oron
ulfur
ntalum
itrogen
Made out of one kind of atom
Found on the periodic table
rium
Compound
Pure substance
Made up of 2 or more elements
CONNECTED together
Chemical Change
Cannot be separated
Compound
• Sugar C6H6O6
Compound
• Salt
NaCl
Mixture
Made up of more than one substance
Substances are MIXED and CAN BE
SEPARATED
Physical Change
Salt water
element
compound
mixture
mixture
NaCl
KOH
H2O
CO2
MnO 2
compound
compound
compound
compound
compound
salt
sugar
water
carbon dioxide
manganese oxide
Soda
Silver
Tap water
Salt water
Air
mixture
element
mixture
mixture
mixture
Acids
Sour taste
Corrode metals
Have a H atom in the compound
Turn litmus paper red
Bases
Bitter taste
Slippery when touched
Made out of a metal combined with OH
Turn litmus paper blue
Acids and Bases
When combined acids and bases create
Salt and Water
Factors that change the rate of a
reaction (make them faster)
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Heat
Bigger amount of chemicals
Add more pressure
Catalysts like MnO2