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 matterIdentify 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 matterSolidLiquidGasWhat is Matter?Everything that has mass and volume is called 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 pointBoiling pointVapor pressureColorState of matterDensityElectrical conductivitySolubilityAdsorption to a surfaceHardnessPhysical 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 acidsReaction with bases (alkalis)Reaction with oxygen (combustion)Ability to act as oxidizing agentAbility to act as reducing agentReaction with other elementsDecomposition into simpler substancesCorrosionChemical Changes are characterized by the following:
13 Evidence of Chemical Change the evolution of a gasthe formation of a precipitatethe release or absorption of energya change in temperature or the giving off of light energya color change in the reaction system
14 Section ReviewPage 9, Answer the questions #1-10