Chemical reactions 1
Atoms must collide with a minimum amount of activation energy
What is the primary purpose if adding coefficients to a chemical equation during
the process of stoichiometry
To ensure that the law of conservation of mass is being followed.
When bonds are broken what type of may there be
(Hint 2 answer)
Endothermic or Exothermic
How can you tell if something is a acidic then looking at the composition
If there is H+ in the composition its acidic
Give an example of a chemical change
Pancakes being baked
Is this a chemical change
a peice of wood is burned, releasing carbon from the heat
Yes
If a reaction results in 1 solid creating 2 liquids what's the giveaway that this is a chemical rxn
The formation of a precipitate
What's the difference between Endothermic and Exothermic energy
Endothermic takes in energy which makes it colder than Exothermic energy which releases
energy meaning its hotter
How can you tell if something is a basic then looking at the composition
If the composition shows an OH- in it
Give an example of a physical change
Ice melting
= is the arrow
Yields
Is this true for chemical reactions
Breaking bonds release energy while making a bond requires energy.
No
What are the 2 energy types involved in chemical reactions
Light and Heat
The PH scale goes from which number to which number
0 meaning very acidic
14 meaning very basic
In a graph where would it show the activation energy
At the peak of the graph
according to the law of conservation of mass if 10g of reactant A reacts with 5g of reactant B
,what must be the total mass of the products
15g
In the equation
AB+ CD = AD + CB
what would we call this rxn
Double Replacement/Displacement
What is activation energy
amount energy that is required for the bond to form is called "Activation Energy"
What liquid has a PH of 7
Water
What is decomposition
The separation of an element
A reaction is observed where 2 simple elements combine to form a single element,
more complex compound. What is the reaction called
Synthesis Reaction
In the molecule 4CH_4, what does the subscript 4 tell us about the composition
of the substance
That there are 4 hydrogen
How can u tell if a reaction is endothermic or exothermic using a graph
If the starting energy is lower than b/4 than that means there was an exothermic reaction
because energy was released but if the opposite happens there was an endothermic reaction.
Acids turn blue litmus paper red and bases turn red litmus paper blue true or false
True
What is a synthesis reaction
The forming of a two or more elements