chemistry ch 8 study guide
What is a precipitate?
A solid that forms from a solution during a chemical reaction.
what is the symbol for a substance in water solution?
Aq
How do you form a precipitate
Chemical reaction
In writing a chemical equation that produces hydrogen gas, the correct representation of hydrogen gas is
H2
Law of Conservation of Mass
Matter is not created nor destroyed in any chemical or physical change
Formation of Sulfur Dioxide
S+O2->SO2 coal contains sulfur which reacts during combustion forming sulfur dioxide
Ca + 2HCl --> H2 + CaCl2
Single replacement
what does a chemical formula written over the arrow in a chemical reaction signify?
catalyst. doesnt change the reaction just speeds it up.
What is the small whole number that appears in front of a formula in a chemical equation?
coefficient
2MgO --> 2Mg + O2
decomposition
AX --> A + X
decomposition
in what kind of reaction does a single compound produce two or more simpler substances
decomposition
ions of two compounds exchange places
double displacement
AX + BY --> AY + BX
double replacement
In what kind of reaction does one element replace a similar element in a compound?
single replacement
a + bx --> ax + b
single replacement
In what kind of reaction do two or more substances combine to form a new compound?
synthesis
a + x ---> ax
synthesis
4Fe + 3o2 --> 2FeO3 is a
synthesis rxn
how do you know when a chemical equation is balanced?
when there are the same amount of atoms/subscripts on both sides