Intro to Chemistry How does it relate to

Intro to Chemistry How does it relate to your world

Things to think about… � How life? � Of many ways does chemistry apply to your those ways, which holds the most merit? � Why do I need to know chemistry?

What is Chemistry? � The study of the composition of matter and the changes that matter undergoes � Matter is anything that has mass and occupies space � Affects ALL aspects of life and most natural events

Areas of Study � Organic – study of all chemicals containing Carbon � Inorganic – study of all chemicals not containing Carbon � Biochemistry – study of the processes that take place in organisms � Analytical – study that focuses on the composition of matter � Physical – study that deals with the mechanism, the rate, and the energy transfer that occurs when matter undergoes change

Organic Chemistry ALCOHOL ETHER BENZENE

Inorganic Chemistry • Ca. CO 3 � Calcite • Calcium Carbonate � Halite • Sodium Chloride • Na. Cl • Silicon Oxide • Si. O 2 � Quartz

Biochemistry � Plants!

Analytical Chemistry

Physical Chemistry

Pure v. Applied � Pure chemistry – research for research’s sake � Nylon � Applied � Aspirin chemistry – research for a purpose

Purpose � Answers why we are doing the experiment

Research � Research is needed to gain information on the purpose of the experiment � This information will be used to form a hypothesis

Hypothesis � Means educated guess � This is a proposed answer to the problem developed in the purpose

Experiment � An experiment tests your hypothesis � The experiment will contain different variables � Independent Variable – Variable that is changed � Dependent variable – measured based on the changes of the independent variable � Control – used as a comparison to measure results

Data � Always record data in a clear, understandable way � Use charts and graphs to show data whenever possible

Analysis and Conclusion � Analysis is the collection of data from the experiment which should suggest a result � The conclusions states the result of the experiment and whether or not the hypothesis was correct or incorrect

Define the Variables for the Ants � Independent � Dependent � Variable = Length of their legs Variable = Control = Number of steps taken Regular Ant

Talk it out… � How would I find the best basketball shoe? � How would I know the best type of grass for an athletic field? � How would I know which detergent cleans clothes the best?

Qualitative v. Quantitative � Qualitative = qualities, properties, or descriptions � Quantitative calculations � Give = numbers, measurements, or me two examples of each

Accuracy v. Precision � Accuracy – a measure of how close a measurement gets to the apparent or true value of whatever is measured � Precision – a measure of how close a series of measurements are to one another

Por Ejemplo

Ejemplo dos

Ejemplo tres

Prefix Symbol Meaning Multiply By: Giga G Billion 1, 000, 000 International System 10 9 Mega M Million 106 1, 000 Kilo k Thousan 1, 000 d 103 Deci d Tenth 10. 1 Centi c Hundred. 01 th 10 -2 Milli m Thousan. 001 dth 10 -3 Micro µ Millionth. 000001 10 -6 Nano n Billionth 10 -9 -1 . 00001

Measurements Quantity Unit Symbol Length meter m Mass grams g Temperature Kelvin K Time Second s Amount of a substance Mole mol Electric Current Ampere A

Derived Units Quantity Unit Symbol Area Square meter m 2 Volume Cubic meter or Liter m 3 or L Density kilograms per cubic meter kg/m 3 Energy Joule (kg*m 2*s 2) J Frequency Hertz (1/s) Hz Electric Charge Coulomb (A*s) C Pressure Pascal (kg/m*s 2) Pa

Practice � mm � mg � cm � km � Gg � Mm � ng � m. L � k. L • • • millimeters milligrams centimeters kilometers Gigagrams Megameters Nanograms Milliliters kiloliters

The Estimated Digit � In chemistry we will measure materials to an estimated digit � An estimated digit is a magnitude smaller than the tool we are measuring with � We can only go one magnitude because we want to be as accurate as possible

Practice � 3. 2 cm � 2. 35 cm � 36. 3 m. L

Scientific Notation � Written as the product of two numbers: a coefficient and 10 raised to a power � Therefore: 602, 000, 000, 000 � Equals: 6. 02 x 1023 � Or: 0. 00000775 � Equals: 7. 75 x 10 -10

Significant Figures � Includes all the digits that are known PLUS a last digit that is estimated when measuring � Calculations figures!!! � Significant are based on significant figures are based on a set of rules

Significant Figure Rules 1. 2. 3. 4. Every nonzero digit in a reported measurement is assumed to be significant Zeros appearing between nonzero digits are significant Left most zeros appearing in front of nonzero digits are not significant Zeros at the end of a number and to the right of a decimal point are ALWAYS significant

Significant Figure Rules 5. Zeros at the right most end of a measurement that lie to the left of an understood decimal point are not significant if they serve as place holders to show the magnitude of the number, if zeros are at the right of a decimal point, they are significant 6. Exact quantities have an unlimited amount of significant figures

Starting Number Does number have a decimal? NO Is number counted? YES Infinite sig figs S YE NO Are zeroes YES All digits except leading at the front? Are there zeroes trailing? zeroes O N YES All digits except trailers NO All numbers are sig figs

Examples / Practice � 123 m � 9. 8000 x 104 m � 0. 07080 m � 40506 mm � 22 meter sticks � 98000 m � 3 (Rule 1) � 5 (Rule 4) � 4 (Rule 2, 3, 4) � 5 (Rule 2) � Unlimited (Rule 6) � 2 (Rule 5)

On Your Own! � 0. 05730 m � 4 � 143 � 0. 00073 � 8. 750 x 10 -2 m � � 8765 m 40. 007 m 0. 074 m 1. 072 m � 2 � 4 � 5 � 2 � 4

Adding and Subtracting � The answer to an addition or subtraction calculation should be rounded to the same number of decimal places (not including sig figs) as the measurement with the least number of decimal places � Ex. 12. 52 m + 349. 0 m + 8. 24 m = 369. 76 � Therefore: 369. 76 369. 8

Practice � 8. 3 m + 2. 22 m � 8432 m - 12. 5 m � 35. 2 sec + 2547 sec � 52 m – 0. 0042 m � 2. 4526 m + 8. 4 m � 2. 10 m - 0. 070 m � 1780 m + 0. 08 m � 53. 6 g - 0. 00056 g � 10. 5 m � 8420 m � 2582 sec � 52 m � 10. 9 m � 2. 03 m � 1780 m � 53. 6 g

Multiplying and Dividing � Round the answer to the same number of sig figs as the measurement with the least amount of sig figs � Ex. 7. 55 m x 0. 34 m = 2. 567 m 2 � Therefore: 2. 567 m 2 2. 6 m 2

Practice � 8. 3 m x 2. 22 m � 8432 m / 12. 5 � 35. 2 sec x 2547 � 0. 0042 m x 52 m � 2. 4526 m / 8. 4 � 2. 10 m x 0. 070 m � 1780 m / 0. 08 � 53. 6 g / 0. 00056 � 18 m 2 � 675 m � 89700 �. 22 m 2 sec �. 29 �. 15 m 2 � 20000 m or 2 x 104 m � 96000 m or 9. 6 x 104 m

Conversions � Units can be converted from one to another using a conversion factor or a simple equation � Chemistry using conversions for mass, volume, and parts

Conversion Factors 1 mole = molar mass = 6. 022 x 1023

Conversion Steps Starting Unit Conversion Factors

Conversion Practice 1. 2. 5 atm k. Pa 1. 250 k. Pa (253. 35) 2. 400 Cal J 1. 2000 J (1672) 3. 75 °F °K 2. 3. 0 x 102°K (296) 4. 356 g lbs 3. . 784 g