Describing Chemical Reactions Lesson 9 Chemical Equations Chemical

Describing Chemical Reactions Lesson 9

Chemical Equations Chemical equation is a short easy way to show a chemical reaction using symbols instead of words Use chemical formulas and symbols to summarize a reaction Formulas H 2 O CO 2 C 12 H 22 O 11

Fill in the blank Chemical equations use ________ and _______ to summarize a reaction Examples of a ___________ is CO 2 and _____

Structure of an Equation All chemical equation have a common structure Starting substances reactants New substances products Reactant + Reactant Product + Product Ca. CO 3 Ca. O + CO 2

Fill in the blank The substance you start with in a chemical reaction is called the ________ When the reaction was complete, you have a new substance called the _________

Conservation of Mass States that during a chemical reaction, matter is not created or destroyed All atoms present at he star of the reaction are present at the end States that in a chemical reaction, the total mass of the reactants must equal the total mass of the products https: //www. youtube. com/watch? v=KKNSt. Fn. QGAI

Fill in the Blank The ___________ states that matter is not created or destroyed the total mass of the ______ must equal the total mass of the _______

Opened and Closed Systems Open system: matter can enter from or escape to the surroundings Ex. Burning wood in a fire place Products of the wood fire have escape up the chimney and into the room Closed System: matter is not allowed to enter or leave Ex. Apple decaying under a glass dome Products from decay are contained by the glass dome

Fill in the blank In an ________ matter can enter or escape into is surroundings In a _________ matter can’t escape

Open or closed system Water boiling on the stove in a pot with a lid