Compounds
Formula for Potassium Sulfide
K2S
-1 F-1
water boils on the stove and makes bubbles as it turns from liquid to gas
physical change
The chemicals on the left of the arrow in a chemical reaction equation are called the ______?
Reactants
What are the units of molar mass?
grams/mole
Is Aluminum Oxide an Ionic or Covalent compound?
Ionic
What is a charged atom called?
Ion
fireworks exploding
chemical change
name 2 of the 4 signs that a chemical reaction has occured
formation of a gas, formation of a solid, color change, heat or light being produced
How many grams are in 1 mole of Calcium?
40.08 grams
Diphosphorus tetraoxide
How many energy levels (electron shells) are on a Strontium atom?
5
Rusting of carbon steel
Chemical change
__K +__ S-----> __ K2S
What is the coefficient of K?
2
what is the molar mass of Chromium?
52
formula for disulfur decafluoride
S2F10
Which noble gas has only 2 electrons on its outer shell (energy level)
He
evaporating alcohol
Physical Change
2 H2 + 1 O2 ------> 2 H2O.
If 2 moles of H2 react with excess oxygen, how many moles of water are produced?
2
What is the molar mass of Calcium Fluoride? ( can give a whole number estimate)
CaF2 78
Formula for cobalt(III)oxide?
Co2O3
What was the scientist's name that is known for his gold foil experiment in identifying there is a dense nucleus?
Rutherford
distillation of salt water to recover the water
Physical change
2 H2 + 1 O2 ------> 2 H2O.
If 4 moles of H2 react with excess oxygen, how many moles of water are produced?
4 moles of water
How many moles in 3.7 grams of silicon?
.13