ACS ChemCom 6e Image PPTS - Unit 1A

Created by Kathleen Teel

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Look at book intro.

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More practice with chemical and physical properties

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MatterMatter is anything that has mass and takes up space.

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matter is anything that has mass and takes up space.
The mass of an object is a measure of the amount of matter the object contains.

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Which is more massive

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or

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Units of measureBasic units of measure in the metric
mass- grams or kilograms
volume -milliliter, cubic centimeters or liters
length-cm or meters

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Conversions1000 grams (g) = kilogram (kg)
1000 milliliters(mL) or cm3 = 1 liter
100 centimeters (cm) = 1 meter (m)

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Scientific NotationIn chemistry, you will often encounter very large or very small numbers.

A single gram of hydrogen, for example, contains approximately 602,000,000,000,000,000,000,000 hydrogen atoms.
Try typing this number into your calculator

You can work more easily with very large or very small numbers by writing them in scientific notation.

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In scientific notation, a given number is written as the product of two numbers: a coefficient and 10 raised to a power.

For example, the number 602,000,000,000,000,000,000,000 can be written in scientific notation as 6.02 x 1023.

The coefficient in this number is 6.02. The power of 10, or exponent, is 23.

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975402 in scientific notation?

9.75402 x 105
not 97.5 x 10 4 or anything else

Why would we want to use scientific notation instead of standard notation?

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Numbers less than one have a negative exponent when written in scientific notation. The value of the exponent equals the number of places the decimal has been moved to the right.
0.000 008 = 8 x 10–6


0.00736 = 7.36 x 10–3

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When writing numbers greater than ten in scientific notation, the exponent is positive and equals the number of places that the original decimal point has been moved to the left.

6,300,000. = 6.3 x 106


94,700. = 9.47 x 104

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Are these two numbers equal?

5086 5.086 x 103 why

0.000692 6.92 x 10-4 why

0.002 2 x 10 3 why

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Using your calculator convert the following numbers into scientific notation

234567
.00002345

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Convert the following number into standard notation.

2.65 x 10-2
3.2 x 104
6.716 x 10 -12

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Using Scientific Notation
Solve each problem and express the answer in scientific notation.
a. (8.0 x 10–2) x (7.0 x 10–5)
b. (7.1 x 10–2) + (5 x 10–3)
c. (5.2 x 103) / ( 1.6 x 10-5)

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4.0 x 10-3/2.0x 10-5

6.0 x 105/3.0x10-3

8.0x104/2.0x108

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Qualitative data-descriptive, non-numerical.
What are some data we could observe about this____

Quantitative data or measurements- numbers with units.
What are some data we might want to measure for this ________

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