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Reactions
Balancing Act
Reaction Rates
Solutions
Acids/Bases
100
How do you know if a reaction has occurred?
There is a change in color, odor, temperature, bubbles, explosion, or flames
100
What CANNOT be changed when balancing equations
What is the subscripts
100
Name 2 things that affect how fast a chemical reaction happens
high temp, agitation, concentration, small particle size, large surface area, or presence of a catalyst
100
You have a solution of sweet tea (sugar and tea). In the solution, which is the solute?
What is sugar
100
A ______ is a substance that produces H+ ions in a water solution
What is an acid
200
AB + C --> CB + A AB + C are the _______________
What is reactant
200
Balance the following equation: __Li2O + __H20 --> __LiOH What kind of reaction is this?
What is Li2O + H2O --> 2LiOH synthesis
200
Explain the role of a catalyst
A catalyst is an enzyme that allows a reaction to happen faster. The catalyst is not used up and can be reused.
200
A solution is a ________ mixture.
What is homogeneous
200
BaOH is an example of a substance that is a _______.
What is base
300
A reaction where heat is released is considered to be _______.
What is exothermic
300
In a balanced chemical equation, the mass of the reactants is equal to the _____.
What is product
300
What is agitation?
Stirring something
300
Explain why loose sugar dissolves much faster than a sugar cube
smaller particle size = greater surface area so it is able to dissolve faster
300
Coffee has a pH of about 5. Is this a strong base, weak base, strong acid, or weak acid?
What is weak acid
400
A cold pack is an example of an endothermic reaction because _______.
Heat is absorbed so the temperature decreases
400
Balance the following equation: __BaCl2 + __Al2(SO4)3 --> __BaSO4 + __AlCl3 What kind of reaction is this?
3BaCl2 + Al2(SO4)3 --> 3BaSO4 + 2AlCl3 double displacement
400
Explain the relationship between surface area and particle size when it comes to reaction rates.
If you have small particle size, the particle has a large surface area. Small particle size = higher reaction rate Large Surface area = higher reaction rate
400
The ability of a substance to dissolve in another at a given temperature and pressure is called it's _____________ (which is different for different substances)
What is solubility
400
Explain why you might take an antacid to make your stomach feel better. What are antacids made of?
You take an antacid to neutralize gastric juices in your stomach. Acids contain bases.
500
Where is the energy of a molecule stored
What is the bonds of a molecule
500
Explain what is happening in the following equation (don't just say A + B yields C) 2Mg + O2 --> 2MgO
2 Magnesiums and an Oxygen molecule react to form 2 Magnesium Oxides
500
How does a reaction speed up? (What is happening to the different particles)
They are colliding (hitting each other). The more collisions there are, the faster the reaction happens.
500
A solution that is heated so that it can dissolve additional solute is best described as ________________. A solution that has dissolved as much solute as possible is best described as __________________. A solution that is able to dissolve additional solute is best described as __________________.
supersaturated, saturated, unsaturated
500
The salt potassium chloride, KCl, can be formed by a reaction between what two substances?
What is KOH and HCl. Remember, a salt is a compound formed in a solution from the negative ion of an acid and the positive ion of a base. You know K is positive, so it must go with OH which is negative You know that Cl is negative, so it must go with H which is postivie