Mixtures and solutions
this is a homogenous mixture of a solvent and one or more solutes.
solution
You cut a branch off of a tree. Was this a physical change or a chemical change?
Physical. The branch is still wood.
Al + O2 ---> AlO3
What is the product of this reaction?
AlO3
What is synthetic?
anything made by humans
When energy from the environment is absorbed in a chemical reaction.
Endothermic.
What is a heterogeneous mixture?
When the components of a mixture are not evenly spread throughout. You can easily tell there are different components.
When frozen ice melts into liquid water what type of change occurred?
Physical. ice and water are still H2O.
A sealed system where mass cannot escape.
closed system
Give me an example of a common synthetic that we use every day.
Plastics
This is made of two or more substances that are together in the same place, but their atoms are not chemically combined.
mixture
You have a suspension of muddy water, what is the best way to separate the mud from the water?
Filtration/
All chemical changes result in...
a new substance
A + BC ---> B + AC
What type of reaction is shown above?
Replacement. A and B switched places.
What is a natural resource? Give an example
something found in nature that humans use. water, wood, natural oil
The law that states that mass is neither created nor destroyed.
Law of conservation of mass.
What factors affect the properties of the solubility of a solution?
The properties of the solute and solvent, along with the temperature, pressure and concentration of the solute will affect the properties of solubility.
How does increasing temperature affect the rate of a chemical reaction?
increasing temperature will usually increase the rate of a reaction.
N2 + 3H2 ----> NH3
Is the equation balanced?
No add a coefficient of 2 in front of the product
What is one benefit to using synthetic materials
cheaper, last longer, etc
What is the definition of a polymer?
Long chains of molecules that are made up of repeating units called monomers.
Sugar water is an example of....
A solution.
What is an exothermic reaction?
When energy(heat) is released during a chemical reaction. example burning a candle.
When mixing baking soda and vinegar in a cup. You notice that the mass of the reactants does not equal the mass of the product. What could have happened to the missing mass?
The jar was an open system so some of the mass could have been lost when the gas bubbles escaped.
What are some disadvantages to eating synthetic foods
health risk, don't know long term affects
What is a reactant?
Substances that undergo chemical changes.