Chem Reactions Flashcards
(28 cards)
An electron in an atom’s outmost energy level
A valence electron
Number written to lower right of chemical symbol
Subscript
Chemical symbols that identify the elements that make up a compound
Chemical formula
The two in the formula H2O is a
Diatomic molecule
Substance formed in a chemical reaction
Product
Matter cannot be created or destroyed by a chem change
Law of conservation of matter
Chem reaction in which electrons are gained
Reduction
Substance change in a chem reaction
Reactant
A more complex substance is formed from two smaller substances
Synthesis reaction
Scientist represent elements by using?
Chemical symbols
The compound NaOH contains which elements
Sodium, oxygen, hydrogen
The oxidation numbers of elements in a compound must add up to?
0
The reactant in the equation 2H2 + O2 yield 2H2O are
Hydrogen and oxygen
In a chem reaction, matter cannot be?
Created
The arrow in a chem equation means?
Yield
The number of atoms on each side of an equation must always be?
Equal
The chemical formula 3H2O means?
Six atoms of hydrogen and three atoms of oxygen
In a chem reaction, atoms gain and lose?
Electrons
The product of a synthesis reaction is always?
Compound
Acids are sometimes called?
Proton donors
When placed in water, all bases release?
Hydroxyl ions
If you put blue litmus paper into a cup if vinegar the paper will turn?
Red
A solution with PH of 2 is?
Strongly acidic
Chemical symbols are made up of one or two_________
Letters
