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Law of Conservation of mass
Open & Closed System
Balanacing
Types of Chemical Reactions
Chemical reactions & Factors affecting the rate
100
What is the Law of Conservation of mass?
During a chemical reaction, the matter is not created or destroyed
100
What is an open system?
A system where the matter can enter in or escape to the surrounding
100
What is a Coefficient?
Is the big number that is written in front of the chemical formula.
100
What is Synthesis reaction?
when two or more elements or compounds combine to make a more complex substance.
100
The energy needed to start a chemical reaction is............
Activation energy
200
According to the law of conservation of mass mass of reactants equal products. True or False?
True
200
What is a closed system?
A system where the matter doesn’t enter or leave.
200
In balancing chemical reactions we never change: a) Coefficient b)Subscript
b) Subscript
200
AB = A+B is what type of reaction?
Decomposition reaction
200
If we used a catalyst what will happen to the rate of the reaction?
The rate will increase
300
If we have 10 grams of reactants how many grams of products we should have?
10 grams (reactants=products)
300
A cup is an ......... system
open
300
how many of each element in the formula? 2HO
H=2 O=2
300
one element replaces another element in the compound is a .............reaction
single replacement
300
What is an Enzyme?
A biological catalyst
400
if you have 2 atoms of Hydrogen in the reactants how many should be in the products?
2
400
Earth is an ............ system
Closed
400
When balancing Ahmed changed the subscript. Is that a correct way of balancing?
No
400
AX + BY = BX + AY is what type of reaction?
Double replacement
400
Activation energy is from the top of the graph to the.............
Reactants
500
10 grams C+ 5 grams H = ? grams CH
15
500
A battery is an open system. True or False?
False
500
How do you the reaction is balanced?
number of elements in the reactants = products
500
Which two types of reactions are opposite of each other?
Synthesis and decomposition
500
If the energy of the reactants are higher than the energy of the products. the reaction is exothermic. True or false?
True