Physical Change
What are some physical changes?
Change in size, change in shape
When a substance changes color, like when an apple turns brown after being cut, this is often a sign of this.
Chemical Change
CH4 + 2O2 → CO2 and 2H2O. Has a chemical reaction occurred?
The elements have been rearranged from the reactant to the product side.
Name at least two types of natural materials.
Wood
Cotton
Wool
Iron
When a metal is considered shiny
Luster
This is the state of matter where particles are packed tightly together but can still move slightly.
Solid
What is the name of the process taking place where water is separated into hydrogen and oxygen?
Electrolysis
What does the phrase "simple molecule" mean?
A single unit:
examples: H2O, CH4
Name at least two types of synthetic materials.
Nylon
Polyester
Steel
Rayon
What is malleability?
When a metal can be hammered into thin sheets.
In this state of matter, particles move freely and can fill any container.
Gas
What are more signs that a chemical change has taken place?
New odor
New substance
Heat or energy released
New sound made
New light
Whats the difference between the molecular structure of a gas and a solid?
Gas is a single molecule scattered around.
A solid has a structure of repeating units of molecules locked together.
Why do people typically make synthetic materials?
To satisfy a want or need.
Cheaper.
The natural resource wasn't good enough.
Why types of temperatures do non metals need in order to melt?
The process by which a liquid changes into a gas is called this.
Evaporation
The chemical formula for Methane is CH4. Methane is then separated into separate reactants. If 3 tubes of carbon are collected, how many tubes of hydrogen would be collected?
There’s 4 atoms of hydrogen for every carbon so there would be 12 tubes of hydrogen collected.
What is an atom?
A single unit containing one nucleus and 1 set of electrons.
What are the benefits of natural materials?
They decompose.
Some are renewable
Some are non-toxic
Are metals or nonmetals usually conductive?
When a substance goes from a liquid to a solid this is called..
Freezing point
Water went through electrolysis. 4 tubes of hydrogen were collected, how many tubes of oxygen would be collected?
Water is H2O so there are 2 hydrogen atoms for every oxygen atom so that means if 4 tubes are hydrogen then there will be 2 tubes of oxygen.
What is a compound?
2 or more atoms chemically combined together.
What is the law of conservation of mass?
Mass(Matter) cannot be created nor destroyed.
Metals