Chemical Reaction Basics
Bubbling may be evidence of a chemical reaction, indicating formation of a new gas. Name three other observations that may be evidence of chemical change.
A new solid is forming. A change in temperature. A color change.
What reactant must be present for every combustion reaction to occur?
Oxygen
O2
What kind of reaction is this,
2H2O(l) -----> 2H2(g)+ O2(g)
It is a decomposition reaction.
The symbols (s), (l), (g), and (aq) symbolize what in a chemical reaction
(g) gas, (s) solid, (l) liquid, (aq) aqueous. States of matter
These are broken and reformed in a chemical reaction.
What are chemical bonds.
What are you NOT allowed to change when balancing chemical equations?
The subscript
AB --> A + B is an example of what type of chemical reaction?
Decomposition
Lemon juice and baking soda. Is this a spontaneous or non spontaneous reaction.
Spontaneous.
Write the definition of a non spontaneous reaction.
A reaction that needs energy added to the reaction.
A chemical reaction occurs when a ______ _____________ is formed
New Substance.
What does it mean to say that mass is conserved in a chemical reaction?
The amount of mass in the reactants is the same as in the products
In this type of reaction a single element replaces a similar element in a compound
Single Replacement
What carbon dioxide doing to waters to cause the death of shelffish?
Making the water acidic
What does 'aq' mean?
Agueous and means that is dissolved in water.
What is the name for substances that combine and change in a chemical reaction? In other words, what do you start with?
Reactants!
Which of the following reactions is balanced?
4KMnO4 ---------> 2K2O + 4MnO + 4O2
2N2O5 + NO -----> 4NO2
Cl2 + 2Br --------> 2Cl + Br2
Cl2 + 2Br --------> 2Cl + Br2
What would we call a reaction where the beaker feels hot during the reaction.
Exothermic
What type of reaction is this?
C3H8 + O2 --> CO2 + H2O
Combustion
When we add numbers when balancing an equation, what are we doing to the equation.
Stating the number of each type of molecule in the chemical reaction.
How could I reduce the pH of a substance.
Add acid to the substance to lower the pH of the solution.
What two reactions are opposite/reverse of each other?
Synthesis and Decomposition
What is the name of the product formed when Magnesium and Oxide react with each other?
Mg + O2 -->
Magnesium Oxide
Which is the more reactive metal out of K and Mg? And why?
K because it only has to give one electron away instead of two.