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CHAPTER What is Chemistry? 1.2 Describing Matter

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Presentation on theme: "CHAPTER What is Chemistry? 1.2 Describing Matter"— Presentation transcript:

1 CHAPTER 1 1.1 What is Chemistry? 1.2 Describing Matter
1.3 How is Matter Classified?

2 Describe ways in which chemistry is a part of your daily life.
Describe that chemical and physical changes. Describe the characteristics of the three common states of matter Identify the reactants and products in a chemical reaction. Able to make a list of evidence of chemical reaction.

3 Sec 1.1 What is Chemistry? 1. Make a list of all the chemicals that you can think of. 2. Which ones on that list could you live without? 3. Which ones on the list could you not live without?

4 Definition: What is Chemistry? Make your own definition.
Chemistry (1947) – the science of substances: their structure, their properties, and the reactions that change them into other substances. Chemistry (1998) – the study of matter and the changes it undergoes.

5 What is a chemical? A chemical is any substance that has a definite composition

6 Physical States of Matter
Three states of matter Solid Liquid Gas What is Matter? Everything that has mass and volume is called matter.

7 States of Matter

8 What kind of changes does matter undergo?
All matter, regardless of state, undergoes physical and chemical changes. These changes can be microscopic or macroscopic.

9 What is a physical change?
A physical change occurs when the substance changes state but does not change its chemical composition. For example: water freezing into ice, cutting a piece of wood into smaller pieces, etc. The form or appearance has changed, but the properties of that substance are the same (i.e. it has the same melting point, boiling point, chemical composition, etc.) Definition of physical changes.

10 Characteristics of Physical Changes
Melting point Boiling point Vapor pressure Color State of matter Density Electrical conductivity Solubility Adsorption to a surface Hardness Physical changes are characterized by the following:

11 What are chemical changes?
A chemical change occurs when a substance changes into something new. This occurs due to heating, chemical reaction, etc. You can tell a chemical change has occurred if the density, melting point or freezing point of the original substance changes. Many common signs of a chemical change can be seen (bubbles forming, mass changed, etc). Definition of chemical change.

12 Characteristics of Chemical Changes
Reaction with acids Reaction with bases (alkalis) Reaction with oxygen (combustion) Ability to act as oxidizing agent Ability to act as reducing agent Reaction with other elements Decomposition into simpler substances Corrosion Chemical Changes are characterized by the following:

13 Evidence of Chemical Change
the evolution of a gas the formation of a precipitate the release or absorption of energy a change in temperature or the giving off of light energy a color change in the reaction system

14 Section Review Page 9, Answer the questions #1-10

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