Physical & Chemical Changes
Ripping a piece of paper.
What is a physical change?
20 g H + ___ g O -> 60 g H2O
What is 40 g O?
30 g C + 40 g O - > ___ g CO2
A pure substance containing two or more kinds of elements
What is a compound?
Mixing salt and water together.
What is a homogeneous mixture?
Ice melting into water.
___ g 2O3 -> 50 g 3O2
What is 50 g?
21 g Fe + 24 g O2 -> ___ g Fe2O3
What is 45 g Fe2O3?
Substance containing only one kind of atom
What is an element?
Uniform mixtures that are also known as solutions
What are homogeneous mixtures?
Lighting a candle.
What is a chemical change?
___ g Li + 28 g O -> 42 g Li2O
What is 14 g?
40 g CaCO3 -> 28 g CaO + ___ g CO2
What is 12 g CO2?
These elements are usually positively charged.
Cooking chicken soup.
What is a heterogeneous mixture?
Cooking an egg.
What is a chemical change?
14.8 g H2 + ____ g O2 -> 49.6 g H2O
What is 34.8 g O2?
22 g HCl + 44 g NaOH -> 33 g NaCl + ___ g H2O
What is 33 g H2O?
H2, O4, N2, Xe2
What are examples of elements?
Making a burrito
What is a heterogeneous mixture?
Mixing salt and water.
What is a physical change?
__ H2 + O2 -> 2H2O
What is 2 H2 molecules?
18.9 g C3H6 + 11.1 g O2 -> ___ g CO2 + 15.6 g H2O
What is 14.4 g CO2?
The two ways to separate a compound.
What are electrolysis and chemical reactions?
Creating an alloy out of copper and tin
What is a homogeneous mixture?