A mixture that can be easily seen and sorted
Heterogeneous mixture
Cutting a tomato is an example of this type of change
Physical Change
Reactants
Chemical and resources made by humans
Synthetic materials
The substance that gets dissolved by the solvent
Solute
A tool you can use to separate salt from saltwater
Hot plate (Stove, heat, etc.)
Reactants undergo chemical change to create these
Products
Law of conservation of mass
A long chain of molecules made up of repeating units called monomers. Their properties include strength, flexibility, and elasticity.
Polymers
While cooking you notice that your onions turn from white to yellowish-brown. What type of change occurred to the onions?
Chemical Change
A heterogeneous mixture containing small undissolved particles that do not separate or settle out if the mixture is undisturbed
A colloid (Ex: Glass of Milk, Paint, whipped cream, smoke, etc.)
List three examples of evidence that a chemical change has occurred
Gas Production, Formation of Precipitate, and Color change.
This the following formula balanced:
2Fe + 3O2 = 2Fe2O3
No (2 Fe on one side and 4 Fe on the other)
What are two benefits of synthetic foods?
Longer lasting, cheap to produce, and safer to consume.
A substance that lowers the activation energy needed to start a chemical reaction
A catalyst
The part of a solution that is usually present in the largest amount and dissolves the other substances. (hint* Water is a common example of this)
Solvent
This reaction usually releases heat and energy
Exothermic Reaction
2H2O2 -> 2H2O + O2
Decomposition Reaction
What are two benefits of synthetic fibers?
cheaper to produce, last longer, and clean easier
Chemical Formula for Carbon Dioxide
CO2
Temperature and/or pressure (pressure for gases)
Other than using a catalyst, what are two other ways you can increase the rate of reactions?
Increase temperature and increase surface area
Rust is formed from what kind of chemical reaction?
Artificial sweeter
In the 1940's, a chemist working on plastic gun sights synthesized a material called cyanoacrylate that frustratingly stuck to everything it touched. A few years later, the chemist came up with an important purpose for the sticky material. What material did the chemist make?
Superglue