Notes One Unit Three Define Chemistry Mass and Volume Density Weight versus Mass Atom Versus Element Atoms, Elements, Molecules Reading Scales Pages

What is Chemistry? Chemistry is the study of matter and the changes it undergoes

Chemistry is……Cooking !

Chemistry is......Forensics

Chemistry Is......Industry

Chemistry is……Art

Chemistry is everything!!!!!!

There are three states of matter. What are they? Solid Liquid gas

What are chemical Reactions?

Mass and Volume

Density Amount of matter per unit volume. Is this a solid, liquid or gas? Density=Mass/volume Water: 1.0g/mL. Aluminum: 2.73g/mL. Air: g/mL

Why is density important?

Weight versus Mass Mass VS WeightMassWeight mass  mattermatter weight  force force 1 lb feathers and 1 lb lead? more weight? more mass?

Mass versus Weight

Reading Scales Read Digit(s)Estimated Digit

Size of Scales Read each scale

Reading Scales 600 epp Decimal? 1. Evaluate one digit at a time. 3. Final answer and alternates! NO!  and Place Holder(s)!

Reading Scales 1 r Decimal? 1. Evaluate one digit at a time. 3. Final answer and alternates! Yes!  No and Place Holder(s) 0 e.

Reading Scales re Decimal? 1. Evaluate one digit at a time. 3. Final answer and alternates! No!  and NO Place Holder(s) 7 3

Reading Scales 10 re Decimal? 1. Evaluate one digit at a time. 3. Final answer and alternates! YES!.  No Place Holder(s)!

Reading Scales 10 6 pre Decimal? 1. Evaluate one digit at a time. 3. Final answer and alternates! Yes!  and Place Holder(s) 0 p 0 p.

End of Try One

Reading Scales 100 rep 1.0x Decimal? 1. Evaluate one digit at a time. 3. Final answer and alternates! NO!  and Place Holder(s)!

Reading Scales 10 0 pre Decimal? 1. Evaluate one digit at a time. 3. Final answer and alternates! Yes!  and Place Holder(s) 0 p 0 p.

Reading Scales 1 6 re Decimal? 1. Evaluate one digit at a time. 3. Final answer and alternates! Yes!  and Place Holder(s) 0 p 0 p.

Reading Scales 8 e Decimal? 1. Evaluate one digit at a time. 3. Final answer and alternates! Yes!  and Place Holder(s) 0 p 0 p.

Reading Scales 80 pe Decimal? 1. Evaluate one digit at a time. 3. Final answer and alternates! Yes!  and Place Holder(s) 0 p 0 p.

Notes Two Unit Three Quiz Reading Scales/Review Check The Importance of Measurement Accuracy and Precision Scientific Notation Significant Digit Rules Addition and Subtraction Computer Assignment Number Two Pages 56-64

Reading Scales 100 rre Decimal? 1. Evaluate one digit at a time. 3. Final answer and alternates! YES!.  No Place Holder(s)!

Reading Scales 1 0 re Decimal? 1. Evaluate one digit at a time. 3. Final answer and alternates! Yes!  and Place Holder(s) 0 p.

Reading Scales 10 rr Decimal? 1. Evaluate one digit at a time. 3. Final answer and alternates! YES!.0 e  No Place Holder(s)!

Eight Rows Seven Rows

The Importance of Measurement Qualitative measurements (OBSERVATIONS) Quantitative measurements (SCALES) red 12.0 g/mol liquid 2 eggs 1 dozen 4 legs 1.0 g/mL 25 years old 250 pounds Qualitative Quantitative Qualitative Quantitative Qualitative Quantitative

Accuracy and Precision Accuracy closeness to the actual answer. Precision how well measurements compare. Good Precision Good Accuracy Good Precision Poor Accuracy Poor Precision Poor Accuracy

Scientific Notation is… 4.12x is… 4.00x is… 3.01x is… 5.60x E E E E-3

Identifying Significant Digits X

Identifying Significant Digits X

Identifying Significant Digits X

Identifying The Estimated Digit X

Identifying The Estimated Digit X

Identifying The Estimated Digit X

+ and – of Sig Dig 1.Identify Estimated Digits. 2.Round all measurements to the left most Estimated Digit.

Addition and Subtraction Problem # ID estimated digit. 2. Round to left most Estimated Digit.

Addition and Subtraction Problem # ID estimated digit. 2. Round to left most Estimated Digit.

Addition and Subtraction Problem # x ID estimated digit. 2. Round to left most Estimated Digit.

Addition and Subtraction Problem # ID estimated digit. 2. Round to left most Estimated Digit.

Explanation of SD’s and Add. or Sub. Read the two cylinders: Add the readings. a) ID estimated digits. b) Round to left most c)Add Pour 1 st into 2 nd

Notes Three Unit Three Return Quiz Reading Scales For Corrections Review Addition and Subtraction of Significant Digits Quiz Addition and Subtraction of Significant Digits Explain Multiplication and Division of Significant Digits Computer Assignment Multiplication and Division of Significant Digits Pages 56-64

Addition and Subtraction Problem # ID estimated digit. 2. Round to left most Estimated Digit.

Addition and Subtraction Problem # ID estimated digit. 2. Round to left most Estimated Digit.

Eight Rows Seven Rows

X and ÷ of Sig Dig 1.Identify the number significant digits in each value. 2.Do the indicated math operation. 3.Round to the least number of significant digits.

Multiplication and Division Problem #1 1.ID the SD. 2.Do the math. 3.Round to least x 2=? x 2= 51.8 has 50 shows 1 SD SD 1 SD

Multiplication and Division Problem #2 1.ID the SD. 2.Do the math. 3.Round to least # x 325=? x 325= 3.25 has 3.3 shows 2 SD 2 SD 3 SD SD

Multiplication and Division Problem #3 1.ID the SD. 2.Do the math. 3.Round to least # / 2.0=? / 2.0= 600 has 6.0x10 +2 shows 2 SD 4 SD 2 SD SD

Multiplication and Division Problem #4 1.ID the SD. 2.Do the math. 3.Round to least #. 1.0 / 100.0=? / 100.0= 0.01 has shows 2 SD 2 SD 4 SD SD

Final Quiz Review Lab B results Review For Quiz Quiz Cross Word

Chemistry Lab B Results LengthWidthAreaMassVolumeThickness 13.00cm10.95cm0.65g 12.19cm10.32cm0.61g 11.01cm12.33cm0.62g Data Table 142.4cm cm cm cm cm cm

Calculating Thickness of a Gold Sheet 1. Measure the length and width. 2. Calculate the area. 3. Mass the sheet. 4. Divide mass by density to find volume. 5. Divide volume by area to find thickness.

1.Find width and length cm Calculate area cm x10.21 cm 4SD SD? 102.5cm 2 has 4SD

Reading Scales 3 3 re 0.33g 0.32g 0.34g 2. Decimal? 1. Evaluate one digit at a time. 3. Final answer and alternates! Yes!  and Place Holder(s) 0 p.

1.Calclulate Volume. 2. Calculate thickness. D= m ___ V D m V= ÷ D x V 19.3g/cm g ________ V= D=19.3g/cm 3 V= cm 3 V=0.0017cm 3 ___ T= V A _________ T= cm cm 2 T= x10 -5 T= 1.7x10 -5 cm

Multiplication and Division Problem #1 1.ID the SD. 2.Do the math. 3.Round to least x 2.00=? x 2.00= has 52.0 shows 3 SD SD 3 SD

Multiplication and Division Problem #1 1.ID the SD. 2.Do the math. 3.Round to least. 25 x 2.00=? x 2.00= 50 has 50. shows 2 SD 50 2 SD 3 SD 2 SD

Addition and Subtraction Problem # ID estimated digit. 2. Round to left most Estimated Digit.

Addition and Subtraction Problem # ID estimated digit. 2. Round to left most Estimated Digit.

Chemistry Reading Assignment Two 1.What two properties characterize matter? Mass and Volume 2. What SI units are used to express the density of liquids? Grams/Cubic Centimeters(=mL) 3. How does mass differ from weight? Mass is matter. Weight is the result of gravity acting on mass. 4. Classify the following as either physical or chemical property of matter: area P color P temperature P mass P flammability C odor P oxygen changing to ozone C 5. How does an atom differ from an element? Atoms that have the same proton number are all the same element. 6. How is an atom related to a molecule? Atoms make up molecules: Atoms of hydrogen and oxygen combine to form water. 7. Define each: Mixture- Two or more substances stirred together. Homogeneous- Substances mix so well that they appear as one. Heterogeneous- Substances will not mix. One can see the parts. Solution- A homogeneous mixture.

Chemistry Reading Assignment Three 1. What is energy? The Capacity to do work. 2. State the law of conservation of energy? Energy can neither be created nor destroyed. 3. What is the difference between the potential NRG and kinetic NRG? PE is stored NRG. KE is NRG of motion. Demo????? 4. What is the difference between heat and energy? Energy is KE and PE. Heat is KE. 5. What NRG changes are considered to be chemical NRG? burning candle, dynamite exploding, warmth of working muscles 6. Convert the following Celsius temperatures to Kelvin temperatures. Add 273 to Celsius temperatures. a. 95 o C 368K b. 685 o C 958K c. 0 o C 273K d. -27 o C 246K 7. Convert the following Kelvin temperatures to Celsius temperatures. a. 273K 0 o C b. 756K 483 o C c. 0K -273 o C d. 50K -223 o C

Reading Assignment Four 1. Why are significant digits important when reporting measurements? They give the most reliable answers. 2. What digits are always significant? The digits read or estimated. 3. How does accuracy differ from precision? Accuracy is how close two readings are: and Precision has the most significant digits (Read and Estimated): compared to Why is a graduated cylinder, rather than a beaker, used to precisely measure liquid? A cylinder is more precise and accurate. 5. Underline the significant digits in each of the following values. a. 70. Km b. 70 Km c m d L e g f g g. 100 g/L h. 10.0x10 +2 g/L 6. Express the following quantities in scientific notation. a Km b c d. 200 e ________ ___________ _ ___ x x x x

Reading Scales In order to produce reliable data…density, volume, mass….we need to be able to read the scales on measuring devices. 1.Place Water in the Erlenmeyer flask…Record the reading. 2. Pour the water into the smaller cylinder…Record the reading. 3. Pour the water to the larger cylinder…Record the reading. 4. Measure the mass of the piece of metal using the balance Record the reading. Pages 56-64

SIGNIFICANT DIGIT RULES 1. All non zero digits are significant. 2. Any digit, including zero, read or estimated from a scale is significant. 3. Leading zeroes in numbers are never significant: the three first zeroes in are leading zeroes; therefore, they are not significant. They are, also, never read or estimated form a scale. Leading zeroes show place value. 4. Trailing zeroes are significant if a decimal is present. The zeroes in and 400. are identified as significant by the decimal. Leading zeroes cannot be made significant by a decimal. 5. Only significant digits can be expressed in scientific notation

Reading Scales 10 rr Decimal? 1. Evaluate one digit at a time. 3. Final answer and alternates! YES!.0 e  No Place Holder(s)!