Chemical Equations VMA

balanced

__CaO + __H₂O → __Ca(OH)₂

2, 1, 2

__Na + __F₂ → __NaF

2, 1, 2, 1

__Na + __MgF₂ → __NaF + __Mg

1, 1, 2, 1

__BaCl₂ + __Na₂SO₄ → __NaCl + __BaSO₄

1, 2, 1, 1

__Sn + __HF → __SnF₂ + __H₂

4, 3, 2

__Fe +__O₂ → __Fe₂O₃

1, 3, 1, 2

__CS₂ + __O₂ → __CO₂ + __SO₂

2, 3, 2, 2

__MgS + __O₂ → __MgO + __SO₂

1,2,1,2

Complete combustion of methane gas.

__CH₄ + __O₂ → __CO₂ + __H₂O

reactant

A chemical substance that is present at the start of a chemical reaction.

product

A chemical substance formed as a result of a chemical reaction

chemical equation

A representation of a chemical reaction that uses symbols to show the relationship between the reactants and the products

chemical reaction

A process during which chemical bonds between atoms are broken and new ones are formed. Producing one or more different substances.

law of conservation of mass

During any chemical reaction, the mass of the products is always equal to the mass of the reactants

coefficient

A number in front of a chemical formula in an equation that indicates how many molecules or atoms of each reactant and product are involved in a reaction.

subscript

A number written slightly below and to the right of a chemical symbol that shows how many atoms of an element are in a compound.

balancing chemical equations

keep mass of products and reactants the same by adjusting coefficients as necessary

Bonding

based on the attraction of particles with unlike charges

ionic bond

A chemical bond formed between a metal and a nonmetal in which the metal transfers electrons to the nonmetal, forming a bond. The attraction is due to electrostatic force.

covalent bond

bond between nonmetals in which both shares the same electron

Conductivity

a measure of an ability of an electric current to flow through a substance

Valency

The number of electrons needed to lose/gain/share to gain an octet