Lesson 1
Lesson 2
Lesson 3
Lesson 2.5
Mix
100
This is when original substances undergo a complete change into new substances.
What is a chemical reaction?
100
There are this many elements that make up everything in the universe.
What is 118?
Remember, 98 are natural and 20 are synthetic
100
This reaction releases energy to its surroundings.
What is an exothermic reaction?
100
There are this many atoms in the molecule (l is not an I):
2 NaCl
What is 4?
Na: 2x1
Cl: 2x1
100
The lines on a model indicate this.
What are chemical bonds?
Remember, if a model does not show bonds but shows two objects of different colors touching, then the bonds are implied.
200
These are the outcomes of chemical reactions.
What are products?
200
This is the molecular representation of most solids.
What is networked?
Remember, this is to have all atoms connected to each other adjacently. This gives the substance a solid shape and structure.
200
This term is the energy that substances possess because of the way their atoms are grouped together.
What is chemical energy?
Remember, The value of chemical energy is different for different substances. The difference in the amounts of chemical energy of reactants and products determines whether energy is absorbed or released
200
(Number 4 on the review paper)
There are this many atoms in the molecule:
4 N2H4
What is 24?
Fun fact, this is the formula for "hydrazine" which is a component of rocket fuel.
200
The process of rusting is exemplified by this reaction.
What is a synthesis reaction?
300
This type of replacement reaction is a reaction where one element replaces another element in a compound.
What is a single-replacement reaction?
Review Reaction types in Lesson 1
300
This is the number to the left of a chemical formula in a chemical equation.
What is the coefficient?
It applies to ALL elements to the right of it. Coefficients multiply with subscripts.
300
This component is added to reactants with the only purpose to speed the reaction up.
What is a catalyst?
Remember, reactions are sped up because the activation energy is being lowered
300
(Number 8 on the review paper)
There are this many atoms in the molecule:
8 C2H2
What is 32?
Fun fact, this is the chemical formula of "acetylene" which is used in welding gas.
300
This is how elements are shown as different on a visual model.
What is a change of color?
400
All types of changes in matter around us can be classified as these two terms. 400 for each
What are physical changes and chemical reactions.
If a substance undergoes physical changes such as a change in state, color, shape, etc, then the chemical composition has not changed. The same substance is still present prior to the change. If a substance has undergone a chemical reaction, then a new substance has been created. This new substance will have a unique density and its chemical composition will have undergone a change.
400
This shows different elements on an atomic model that does not show the bonds.
What are the colors?
400
This is the natural decomposition reaction that we covered.
What is (cellular) respiration?
Remember, this is how our bodies break down bonds from food to gain energy.
400
There are this many atoms of hydrogen (H) in the molecule:
5 AsH3
What are 15?
In total, there are 20.
400
Electrolysis is an example of this type of reaction.
What is a decomposition reaction?
Remember, the usage of electricity in any type of reaction makes it an electrochemical reaction.
500
Release of gas, release of an odor, temperature changes, or production of a precipitate are examples of this term.
What are indicators, or reaction cues.
Remember, you're most likely to produce a precipitate in a displacement reaction between two liquids.
500
Combustion reactions must have this element present as a gas to begin the reaction
What is oxygen?
Review your reaction types.
500
Raising the activation energy of a substance is the purpose of this chemical reaction additive.
What is an inhibitor?
Remember, if you are raising the activation energy, then you are making the reaction take longer to begin by forcing it to gain more energy. If you are making the reaction take longer, then you are slowing it down.
500
What coefficient can be added to make this equation balanced.
___ HgO -> 2 Hg + O2
What is 2?
O becomes (2x1)
Hg becomes (2x1)
500
The ignition of a combustion reaction is this type of observation.
What is qualitative?
Remember, the ignition point and any other "point" makes an observation quantitative because it is a data point.