Chemical Reactions SNC2D

Changes A change in which no new substances are formed is called a ?

Changes A change in which no new substances are formed is called a physical change.

Changes A change in which no new substances are formed is called a physical change. e.g. ice melting (both ice and water are H2O)

Changes A change in which new substances are formed is called a ?

Changes A change in which new substances are formed is called a chemical change or chemical reaction.

Changes A change in which new substances are formed is called a chemical change or chemical reaction.

Signs and Symptoms Recall the signs that a chemical reaction may have occurred:

Signs and Symptoms Recall the signs that a chemical reaction may have occurred: heat produced or absorbed

Signs and Symptoms Recall the signs that a chemical reaction may have occurred: heat produced or absorbed light or sound produced

Signs and Symptoms Recall the signs that a chemical reaction may have occurred: heat produced or absorbed light or sound produced colour change

Signs and Symptoms Recall the signs that a chemical reaction may have occurred: heat produced or absorbed light or sound produced colour change gas produced

Signs and Symptoms Recall the signs that a chemical reaction may have occurred: heat produced or absorbed light or sound produced colour change gas produced precipitate formed in solution

Equations Chemical reactions can be represented by either:

Equations Chemical reactions can be represented by either: word equations using the names of the chemicals (e.g. carbon dioxide, water)

Equations Chemical reactions can be represented by either: word equations using the names of the chemicals (e.g. carbon dioxide, water) or chemical equations using the formulas of the chemicals (e.g. CO2, H2O)

Reactants The substances that are reacting are called ?

Reactants The substances that are reacting are called reactants and are written on the left side of the equation. There may be only one; if there is more than one, they are separated by ?

Reactants The substances that are reacting are called reactants and are written on the left side of the equation. There may be only one; if there is more than one, they are separated by + signs.

Reactants The substances that are reacting are called reactants and are written on the left side of the equation. There may be only one; if there is more than one, they are separated by + signs. e.g. carbon dioxide + water CO2 + H2O

Products The new substances formed in the reaction are called ?

Products The new substances formed in the reaction are called products and written on the right side of the equation.

Products The new substances formed in the reaction are called products and written on the right side of the equation. e.g. oxygen gas + glucose

Products The new substances formed in the reaction are called products and written on the right side of the equation. e.g. oxygen gas + glucose O2 + C6H12O6

The two sides of the equation are separated by ?

The two sides of the equation are separated by an arrow (pointing right) that is read as ?

The two sides of the equation are separated by an arrow (pointing right) that is read as “produces” or “yields.”

The two sides of the equation are separated by an arrow (pointing right) that is read as “produces” or “yields.” e.g. carbon dioxide + water oxygen gas + glucose CO2 + H2O O2 + C6H12O6