Science Starter What is the charge of the element magneiusm?

What is the charge of the magneiusm ion?

What is the formula and name of bonding magnesium ion to the chlorate ion?

Unit 7 Chemical ReactionsBasic Chemical Reactions

What is a Chemical Reaction? Chemical reactions are just the rearrangement of

atoms. There are 4 signs of chemical reactions. These include:

Formation of Precipitate Color Change Heat/Light Gas Formation

Reactants react to produce products. Reactants Products DO NOT FLIP THE ARROW! (we don’t read left to right,

it doesn’t make sense, so DON’T DO IT! It gives us chemistry teachers headaches.)

Other Important Information About Chemical Reactions

Sometimes you will see some unique signs and symbols. s, l, g, aq are just physical states (solid, liquid, gas,

aqueous) ∆ is the greek letter delta (means change) and is

used to describe heat that is given to a reaction. Sometimes things like a catalyst is used over the

arrow to describe something that speeds up a chemical reaction. It is not a reactant or a product.

Other important information

All new compounds still follow ALL of the naming and formula writing rules. NEVER CARRY A SUBSCRIPT

If you do this, you will make the compound not neutral and that can ruin the following steps in the unit.

Know your diatomic elements (Mr. Br2I2N2Cl2H2O2F2) and know their physical states!

Know basic physical states for items H2O (l) is a liquid most of the time. CO2 (g), SO2(g), NO2(g), CH4(g)-common name is methane, NH3(g)-common name is

ammonia are all gases. Metals like JUST Ca(s), Na(s), Fe(s), Cu(s) are all solids.

5 Types of Chemical Reactions Double Replacement Single Replacement

Known a lot of the times as a redox reaction (One item loses electrons while another

species gains them) Synthesis (combination) Decomposition Combustion

Double Replacement Examples Double replacement reactions involve two ionic

compounds that react. This is where both the cation and anions of each

chemical switch. It is like two people dancing and bump into each other

which cause them to switch partners halfway through the song.

Please note that you have to make the compounds neutral if you have to predict the products.

AB + CD AD + CB The order of the reactants or the products does

not matter AS LONG AS YOU KEEP THEM AS REACTANTS AND PRODUCTS!

Single Replacement Examples Single replacement involves a compound and a

single element. The compound is broken up by the other similar

substance Look at the single species and see if it could be a

cation or anion. Then swap it with the ionic compound.

It is like a partner cutting into a couples dance. Please note that you have to make the compounds

neutral if you have to predict the products. Watch for diatomics!

AB + C AC + B C is an anion in this example.

AB + C CB + A C is an cation in this example. The single species can be a metal or non-metal!

I should get in on that…

Synthesis Examples

This is also known as a combination reaction. Two or more species (whether they are a

compounds or elements) form ONE SINGLE PRODUCT.

A+B AB Please note that you have to make the

compounds neutral if you have to predict the products.

Keep an eye out for diatomics!

Decomposition Examples

One compound is broken down (decomposed) into two different pieces.

AB A + B Please keep note of diatomics!

Combustion Examples

A compound containing carbon AND hydrogen reacts with oxygen gas, O2

When a compound is “burned” it means there was a combustion reaction.

Products will ALWAYS BE CO2 AND H2O CxHy + O2 CO2 + H2O You may also have other elements in your reactant compound

other than C and H, such as nitrogen and sulfur. These will form new compounds based on what is “leftover” after you’ve created CO2 and H2O. C2H5SH + O2 CO2 + H2O + SO2

Identifying the Reaction From the following reactions, please classify them as SR, DR, S, D, or C:

TRY ME! NaOH + KNO3 → NaNO3 + KOH

What type of reaction am I?

CH4 + 2 O2 → CO2 + 2 H2O What type of reaction am I?

Ca + NaBr → ____________+ _____________ What type of reaction am I?

__________ + __________ → Ca(OH)2 + MgSO4 What type of reaction am I?

Word Practice Please write the chemical equation that matches the following

scenarios: