chem II partial 2 quiz 1

Question 0

Exothermic reaction

Answer 0

When energy absorbed is less than energy released. The energy invested goes up And it’s the energy absorbed to break the bond, and then the bond is made the energy released is greater

Question 1

Chemical reaction

Answer 1

It always breaks bonds first to them make them, you invest energy that is later released when the new bonds are made

Question 2

endothermic reaction

Answer 2

When the energy absorbed is, greater that the one released. You invest energy to break a bond and it’s absorbed, then bonds are made and energy is released but it’s less than the one absorbed.

Question 3

Balancing methods

Answer 3

Normal
Odd even
Ion
Redox

Question 4

Redox

Answer 4

Oxidation numbers
Which elements changed?
Write equation, careful with diatomic elements
Make have same oxidation number with electrons
Balance electrons
Do the rest of the balancing

Question 5

Synthesis

Answer 5

When two elements or compounds come together to form one compound

Question 6

Decomposition

Answer 6

When a compound is broken into elements or compounds

Question 7

Single displacement

Answer 7

When one element displaces another in a compound, metals with metals and non metals with no metals only if that element is on top of the other on the activity series

Question 8

Double displacement

Answer 8

Change, mostly between ionic compounds only or no metals

Question 9

Combustion

Answer 9

An element or compound reacts with oxygen always and energy is released, as well as carbon dioxide or water or both

Question 10

Stoichiometry

Answer 10

Measuring elements
Think sandwich and the coefficients expresses proportions in moles. The molar ratio
It is the calculation or obtaining the relationship of products and reactants using the mole ratio I. A chemical equation
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