Chemical Reactions Flashcards
Valence electrons come together because
Of the number of valence electrons they have.
Using periodic table
You can use the periodic table family members to figure out the valence electrons.
How many valence electrons do the elements in family 2 have
2
How many valence electrons do the elements in family 15 have
5 (ignore 1)
Elements in the same column (family) share the same number of
Valence electrons so they have similar reactivity
What determines how well an element can combine with another element to make a new substance
Valence electrons
Reactivity
Two elements combining to make a new substance
How do compounds form
Through chemical reaction
Why do chemical reactions happen
So atoms can fill their last energy level
Na+Cl is what
NaCl
Sodium chlorine
Sodium transfers an electron to chlorine and makes sodium chloride/salt
New substances have
New properties both chemical and physical
Process of making new. Substances
Chemical reaction
A chemical reaction is also
Chemical change
Chemical reactions are written as
Equations which are called chemical equation
2Na + 2H ₂O
2NaOH+ H ₂
Arrow in chemical equations
Yield (makes or creates)
Reactants
The molecules that go into the equation
Products
The molecules that come out of the equation
Exothermic reactions
Reaction that releases heat causing temps turn around it to rise
Endothermic
Reaction that absorbs heat causing surroundings to cool
Law of conservation states that
Chemical reactions matter is neither created or destroyed
Atoms that go into a reaction
Are the same atoms that come out just rearranged into different molecules
What determines the properties of a mineral
The arrangement of atoms
Least reactive family
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