Ch. 07 - Chemical Reactions
Ch. 07 - Chemical Reactions
Chemical Changes in Matter
Chemical Reaction- A change in which one or more substances are converted to different substances.
http://science.howstuffworks.com/chemical-reaction-videos-playlist.htm
SIGNS of a Chemical Reaction– color change, odor produced, light or sound produced, precipitate produced, heat or cold produced, gas produced, burning, rusting
https://www.youtube.com/watch?v=8RmVwz2fNGc Law of Conservation of Mass In a chemical reaction, the mass before the reaction must equal the mass after the reaction Atoms are only rearranged in a chemical reaction
Formula Equation An expression that describes a chemical reaction Uses chemical formulas and symbols instead of words AKA: short hand way to write a chemical reaction
REACTANTS(left of arrow) substances that enter reaction
PRODUCTS(right of arrow)- new substances produced
A+BC+D
Symbols in Chemical Equations ,Yields
Coefficients whole numbers found in front of a chemical formula represents the number of units of each substance Coefficient is applied to each element in the formula USED TO SHOW LAW OF CONSERVATION OF MASS
EX:
2Mg 2 atoms of magnesium 3CO2 3 molecules of carbon dioxide 4MgO 4 units of magnesium oxide
BALANCING CHEMICAL EQUATIONS
PURPOSE: To show the law of conservation of mass
HOW TO: use coefficients in front of formulas so there are equal number of atoms of each element on each side of the equation. Do not change subscripts!
This is trial and error– I suggest you use pencil!!
Writing formula eq. and Balancing
Writing formula eq. and Balancing
More practice
Writing formula eq. and Balancing
Solid carbon disulfide burns in oxygen to yield carbon dioxide and sulfur dioxide gas
More practice
Word equations into Formula/chemical Equations- and balance PRACTICE: Solid Barium plus oxygen gas yield solid barium oxide Cesium Iodide and Bromine yield Cesium Bromide and
Iodine Solid Magnesium plus oxygen gas yield solid magnesium
oxide
Writing formula eq. and Balancing Nitrogen gas plus hydrogen gas produces liquid nitrogen trihydride Iron metal reacts with aqueous silver nitrate to produce aqueous Iron ( III) nitrate and silver metal.
Aluminum and copper(II) chloride form copper and aluminum chloride.
Chemical Changes in Matter
Chemical Reaction- A change in which one or more substances are converted to different substances.
http://science.howstuffworks.com/chemical-reaction-videos-playlist.htm
SIGNS of a Chemical Reaction– color change, odor produced, light or sound produced, precipitate produced, heat or cold produced, gas produced, burning, rusting
https://www.youtube.com/watch?v=8RmVwz2fNGc Law of Conservation of Mass In a chemical reaction, the mass before the reaction must equal the mass after the reaction Atoms are only rearranged in a chemical reaction
Formula Equation An expression that describes a chemical reaction Uses chemical formulas and symbols instead of words AKA: short hand way to write a chemical reaction
REACTANTS(left of arrow) substances that enter reaction
PRODUCTS(right of arrow)- new substances produced
A+BC+D
Symbols in Chemical Equations ,Yields
Coefficients whole numbers found in front of a chemical formula represents the number of units of each substance Coefficient is applied to each element in the formula USED TO SHOW LAW OF CONSERVATION OF MASS
EX:
2Mg 2 atoms of magnesium 3CO2 3 molecules of carbon dioxide 4MgO 4 units of magnesium oxide
BALANCING CHEMICAL EQUATIONS
PURPOSE: To show the law of conservation of mass
HOW TO: use coefficients in front of formulas so there are equal number of atoms of each element on each side of the equation. Do not change subscripts!
This is trial and error– I suggest you use pencil!!
Writing formula eq. and Balancing
Writing formula eq. and Balancing
More practice
Writing formula eq. and Balancing
Solid carbon disulfide burns in oxygen to yield carbon dioxide and sulfur dioxide gas
More practice
Word equations into Formula/chemical Equations- and balance PRACTICE: Solid Barium plus oxygen gas yield solid barium oxide Cesium Iodide and Bromine yield Cesium Bromide and
Iodine Solid Magnesium plus oxygen gas yield solid magnesium
oxide
Writing formula eq. and Balancing Nitrogen gas plus hydrogen gas produces liquid nitrogen trihydride Iron metal reacts with aqueous silver nitrate to produce aqueous Iron ( III) nitrate and silver metal.
Aluminum and copper(II) chloride form copper and aluminum chloride.
