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