Presentation is loading. Please wait.

Presentation is loading. Please wait.

Chapter 7 Chemical Reactions.

Similar presentations

Presentation on theme: "Chapter 7 Chemical Reactions."— Presentation transcript:

1 Chapter 7 Chemical Reactions

2 Ch 7.1 – Chemical Formulas & Equations
A. Matter can change physically or chemically; a process that produces a chemical change is a chemical reaction

3 B. A chemical equation is a shorthand form of what reactants are used and what products are formed in a chemical reaction 1. Some use words or chemical names to identify the products and reactants Ex: Iron + Oxygen + Water Rust

4 2. Chemical formulas can represent chemical names in an equation
Ex: Fe + H2O FeO2 + H2

5 C. The mass of the reactants and products in a chemical reaction is always the same due to the Law of Conservation of Mass

6 D. Chemical equations are balanced when the number of atoms is the same on each side of the equation
Ex: Fe + 2H2O FeO2 + 2H2 2 oxygen 2 oxygen 4 Hydrogen 1 iron atom 4 Hydrogen 1 iron atom

7 1. In a chemical equation the reactants (substances going into reaction) are on the left and the products (substances being produced) are on the right Ex: Fe + 2H2O FeO2 + 2H2 Reactants Products

8 E. Energy is released or absorbed during a chemical reaction
1. Exothermic reactions – release energy 2. Endothermic reactions – absorb energy

9 Ch 7.2 – Rates of Chemical Reactions
Different chemical reactions take different amounts of time Activation Energy – the amount of energy needed to start a reaction

10 C. The rate of reaction measures how quickly a reactant is disappearing and how quickly a product is appearing 1. Tells how quick a substance changes per unit time 2. Important in industry; the faster a product can be made the lower the cost

11 3. Factors that change reaction rates:
a) Temperature – higher temp. faster particles are move and collide which makes reactions happen more quickly

12 b) Concentration – amount of substance per volume

13 c) Particle size/Surface area –. more surface area the faster the
c) Particle size/Surface area – more surface area the faster the rate due to more area to react on

14 D. Inhibitor – a substance that slows down the rate of a chemical reaction
E. Catalyst – a substance that speeds up the rate of reaction ex: Enzymes – special proteins in the human body

Download ppt "Chapter 7 Chemical Reactions."

Similar presentations

Ads by Google