Chapter 1 introduction to chemistry
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Chapter 1 “ Introduction to Chemistry”. Section 1.1 Chemistry. OBJECTIVES: Identify five traditional areas of study in chemistry. Section 1.1 Chemistry. OBJECTIVES: Relate pure chemistry to applied chemistry. Section 1.1 Chemistry. OBJECTIVES: Identify reasons to study chemistry.

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Chapter 1 “ Introduction to Chemistry”

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Chapter 1 introduction to chemistry

Chapter 1“Introduction to Chemistry”


Section 1 1 chemistry

Section 1.1Chemistry

  • OBJECTIVES:

    • Identify five traditional areas of study in chemistry.


Section 1 1 chemistry1

Section 1.1Chemistry

  • OBJECTIVES:

    • Relate pure chemistry to applied chemistry.


Section 1 1 chemistry2

Section 1.1Chemistry

  • OBJECTIVES:

    • Identify reasons to study chemistry.


What is chemistry

What is Chemistry?

  • Chemistry is the study of the composition of “matter” – (matter is anything with mass and occupies space), its composition, properties, and the changes it undergoes.

  • Has a definite affect on everyday life - taste of foods, grades of gasoline, etc.

  • Living and nonliving things are made of matter.


Chapter 1 introduction to chemistry

Chemistry is the study of the composition, structure, and properties of matter and the changes it undergoes – such as burning fuels.

C2H5OH+3O2 2 CO2 + 3 H2O + Energy

Reactants  Products


5 major areas of chemistry

5 Major Areas of Chemistry

  • Analytical Chemistry- concerned with the composition of substances.

  • Inorganic Chemistry- primarily deals with substances without carbon

  • Organic Chemistry- essentially all substances containing carbon

  • Biochemistry- Chemistry of living things

  • Physical Chemistry- describes the behavior of chemicals (ex. stretching); involves lots of math!

    Boundaries not firm – they overlap and interact


Chapter 1 introduction to chemistry

- Page 8


What is chemistry1

What is Chemistry?

  • Pure chemistry- gathers knowledge for the sake of knowledge

  • Applied Chemistry- is using chemistry to attain certain goals, in fields like medicine, agriculture, and manufacturing – leads to an application* Nylon – Figure 1.3, page 9

    * Aspirin (C9H8O4) - to relieve pain

    * Use of TECHNOLOGY (benefit!)


Why study chemistry

Why Study Chemistry?

  • Everyone and everything around us involves chemistry – explains our world

  • What in the world isn’t Chemistry?

  • Helps you make choices; helps make you a better informed citizen

  • A possible career for your future

  • Used to attain a specific goal

  • What did we describe as “pure” and “applied” chemistry?


Why study chemistry1

Why Study Chemistry?

  • Figure 1.2, page 8

    • What benefits do each of the pictures represent in improving our lives?

    • Give examples in your daily life that involve use of chemistry, and things that do not?


Section 1 2 chemistry far and wide

Section 1.2Chemistry Far and Wide

  • OBJECTIVES:

    • Identify some areas of research affected by chemistry.


Section 1 2 chemistry far and wide1

Section 1.2Chemistry Far and Wide

  • OBJECTIVES:

    • Describe some examples of research in chemistry.


Section 1 2 chemistry far and wide2

Section 1.2Chemistry Far and Wide

  • OBJECTIVES:

    • Distinguish between macroscopic and microscopic views.


Chemistry far and wide

Chemistry Far and Wide

  • Chemists design materials to fit specific needs – velcro (Patented in 1955) on page 12

  • perfume, steel, ceramics, plastics, rubber, paints, nonstick cooking utensils, polyester fibers

  • Two different ways to look at the world: macroscopic and microscopic


Chemistry far and wide1

Chemistry Far and Wide

  • Energy – we constantly have greater demands

    • We can conserve it; use wisely

    • We can try to produce more; oil from soybeans to make biodiesel

    • fossil fuels, solar, batteries (that store energy – rechargeable?), nuclear (don’t forget pollution!)


Chemistry far and wide2

Chemistry Far and Wide

  • Medicine and Biotechnology-

    • Supply materials doctors use to treat patients

    • vitamin C, penicillin, aspirin (C9H8O4)

    • materials for artery transplants and hipbones

    • bacteria producing insulin


Chemistry far and wide3

Chemistry Far and Wide

  • Agriculture

    • Produce the world’s food supply

    • Use chemistry for better productivity – soil, water, weeds

    • plant growth hormones

    • ways to protect crops; insecticides

    • disease resistant plants


Chemistry far and wide4

Chemistry Far and Wide

  • The Environment

    • both risks and benefits involved in discoveries

    • Pollutants need to be 1) identified and 2) prevented

    • Lead paint was prohibited in 1978; Leaded gasoline? Drinking water?

    • carbon dioxide, ozone, global warming


Chapter 1 introduction to chemistry

- Page 16

Let’s examine some information from a graph.

88.2%

440,000

After lead was banned in gasoline and public water supply systems, less lead entered the environment.


Chemistry far and wide5

Chemistry Far and Wide

  • The Universe

    • Need to gather data from afar, and analyze matter brought back to Earth

    • composition of the planets

    • analyze moon rocks

    • planet atmospheres

    • life on other planets?


Section 1 3 thinking like a scientist

Section 1.3Thinking Like a Scientist

  • OBJECTIVES:

    • Describe how Lavoisier transformed chemistry.


Section 1 3 thinking like a scientist1

Section 1.3Thinking Like a Scientist

  • OBJECTIVES:

    • Identify three steps in the scientific method.


Section 1 3 thinking like a scientist2

Section 1.3Thinking Like a Scientist

  • OBJECTIVES:

    • Explain why collaboration and communication are important in science.


Alchemy developed the tools and techniques for working with chemicals

Alchemy – developed the tools and techniques for working with chemicals

  • The word chemistry comes from alchemy – practiced in China and India since 400 B.C.

  • Alchemy has two sides:

    • Practical: techniques for working with metals, glass, dyes, etc.

    • Mystical: concepts like perfection – gold was a perfect metal


An experimental approach

An Experimental Approach

  • In the 1500s, a shift started from alchemy to science – King Charles II was a supporter of the sciences

  • “Royal Society of London for the Promotion of Natural Knowledge”

  • Encouraged scientists to use more experimental evidence, and not philosophical debates


Lavoisier

Lavoisier

  • In the late 1700s, Antoine Lavoisier helped transform chemistry from a science of observation to the science of measurement – still used today

  • He settled a long-standing debate about burning, which was…

    • Oxygen was required!


The scientific method

The Scientific Method

  • A logical approach to solving problems or answering questions.

  • Starts with observation- noting and recording information and facts

  • hypothesis- a proposed explanation for the observation; must be tested by an experiment


Steps in the scientific method

Steps in the Scientific Method

1. Observations (uses your senses)

a)quantitative involves numbers = 95oF

b)qualitative is word description = hot

2. Formulating hypotheses (ideas)

- possible explanation for the observation, or “educated” guess

3. Performing experiments (the test)

- gathers new information to help decide

whether the hypothesis is valid


Scientific method

Scientific Method

  • “controlled” experiment- designed to test the hypothesis

  • only two possible answers:

    • hypothesis is right

    • hypothesis is wrong

  • We gather data and observations by doing the experiment

  • Modify hypothesis - repeat the cycle


Scientific method1

Scientific Method

  • We deal with variables, or factors that can change. Two types:

    1) Manipulated variable (or independent variable) is the one that we change

    2) Responding variable (or dependent variable) is the one observed during the experiment

  • For results to be accepted, the experiment needs to always produce the same result


Outcomes over the long term

Outcomes over the long term…

  • Theory (Model)

    - A set of well-tested hypotheses that give an overall explanation of some natural phenomenon – not able to be proved

  • Natural Law (or Scientific Law)

    - The same observation applies to many

    different systems; summarizes results

    - an example would be:

    the Law of Conservation of Mass


Chapter 1 introduction to chemistry

Law vs. Theory

  • A law summarizes what has happened.

  • A theory (model) is an attempt to explain why it happened – this changes as new information is gathered.


Chapter 1 introduction to chemistry

- Page 22

The procedure that is used to test the hypothesis

Using your senses to obtain information

Hypothesis is a proposed explanation; should be based on previous knowledge; an “educated” guess

Tells what happened

A well-tested explanation for the observations; cannot be proven due to new discoveries


Collaboration communication

Collaboration / Communication

  • When scientists share ideas by collaboration and communication, they increase the likelihood of a successful outcome

  • Collaboration – Fig. 1.21, p. 24

  • How is communication done?

  • Is the Internet reliable information?

    • http://www.dhmo.org


Section 1 4 problem solving in chemistry

Section 1.4Problem Solving in Chemistry

  • OBJECTIVES:

    • Identify two general steps in problem solving.


Section 1 4 problem solving in chemistry1

Section 1.4Problem Solving in Chemistry

  • OBJECTIVES:

    • Describe three steps for solving numeric problems.


Section 1 4 problem solving in chemistry2

Section 1.4Problem Solving in Chemistry

  • OBJECTIVES:

    • Describe two steps for solving conceptual problems.


Problem solving in chemistry

Problem Solving in Chemistry

  • We are faced with problems each day, and not just in chemistry

  • A solution (answer) needs to be found

  • Trial and Error may work sometimes?

  • But, there is a method to problem solving that works better, and these are skills that no one is born knowing – they need to be learned.


Problem solving in chemistry1

Problem Solving in Chemistry

  • Effective problem solving usually involves two general steps:

    • Developing a plan

    • Implementing that plan

  • The skills you use to solve a word problem in chemistry are NOT different from those techniques used in shopping, cooking, or planning a party.


Solving numeric problems

Solving Numeric Problems

  • Measurements are an important part of chemistry; thus many of our word problems involve use of mathmatics

    • Word problems are real life problems, and sometimes more information is presented than needed for a solution

  • Following skills presented will help you become more successful


Solving numeric problems1

Solving Numeric Problems

  • The three steps we will use for solving a numeric word problem are:

    • Analyze

    • Calculate

    • Evaluate

  • The following slides tell the meaning of these three steps in detail.

Let’s learn how to ACE these numeric word problems!


Solving numeric problems2

Solving Numeric Problems

  • Analyze: this is the starting point

    • Determine what are the known factors, and write them down on your paper!

    • Determine what is the unknown. If it is a number, determine the units needed

    • Plan how to relate these factors- choose an equation; use table or graph

  • This is the heart of successful problem solving techniques – it is the PLAN


Solving numeric problems3

Solving Numeric Problems

  • Calculate:perform the mathematics

    • If your plan is correct, this is the easiest step.

    • Calculator used? Do it correctly!

    • May involve rearranging an equation algebraically; or, doing some conversion of units to some other units.


Solving numeric problems4

Solving Numeric Problems

  • Evaluate: – the finishing step

    • Is it reasonable? Make sense? Do an estimate for the answer, and check your calculations.

    • Need to round off the answer?

    • Do you need scientific notation?

    • Do you have the correct units?

    • Did you answer the question?


Solving conceptual problems

Solving Conceptual Problems

  • Not all word problems in chemistry involve doing calculations

  • Nonnumeric problems are called conceptual problems – ask you to apply concepts to a new situation

  • Steps are:

    • Analyze and 2) Solve

  • Plan needed to link known to unknown, but no checking units or calculations

  • Do Conceptual Problem 2.1 on page 46


Chapter 1 introduction to chemistry

End of Chapter 1

Introduction to Chemistry


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