Follow document for instructions, only Experiment 1. Math Assignment needs to be done, then assignment starts on Part A

Math Assignment

Name Matthew Ramirez CHM100 Section 029LS

1. Solve the following: a) 256 × 0.05 =

b) 2.5 × 100 =

c) d) e)

2. Express the following exponentially: a) 10,000 c) 0.0015

b) 150 d) 0.023

3. Express the following as whole numbers:

a) c)

b) d)

4. If

a) Write an equation for c in terms of a and b

b) Write an equation for b in terms of a and c

5. Given that

a) Find

b) Find

6. Given the following data, fine the average

35.3 35.6 34.9 35.0

7. 2.5 centimeters = 1.00 inches

a) How many centimeters are there in 5.0 inches?

100

b) How many inches are there in 21.0 centimeters?

8. The density is defined as the mass of a substance divided by its volume. Determine the density of

9.0 mL of a liquid with a mass of 13.4 grams.

9. The density of mercury is 13.5 g/mL. Determine the number of grams found in 30.0 mL of mercury?

10. A sample weighing 30.0 grams contains 1.5 grams of salt. Determine the percent salt found in the sample.

11. A sample contains 25% water and weighs 201 grams. Determine the grams of water in thesample.

Experiment 1. Metric System and Measurements

OBJECTIVES:

(a) You will become familiar with the metric system of measurements.

(b) You will make measurements of mass, length, temperature and report you answer to the correct number of significant digits (significant figures). You will become familiar with rules for reporting the correct number of significant digits when adding, multiplying, dividing and subtracting measurements.

(c) You will become familiar with using measuring devices (balances) and different types of glassware.

INTRODUCTION

In chemistry, you will use two types of numbers:

a. Exact numbers and

b. Numbers that result from measurements

Exact numbers

An exact number is a number that arises when you count items or sometimes when you define a unit. For example, there are 20 students in a class. 20 is an exact number because there are exactly 20 students not 20.00001 or 19.9999. Exact numbers have an infinite number of significant digits. or

1 dozen = 12. Twelve in this definition is an exact number, because a dozen is exactly 12, not 11.99999 or 12.00000001 etc. but exactly 12.

Measured Numbers

A measurement is a quantity with a unit.

2 is just an exact number.

2 cm is a measurement of length. It has a number followed by a unit

In this experiment, you will make measurements using the metric system of units. The metric system is a system of units of measurement established from its beginnings in 1874 by diplomatic treaty, to the more modern General Conference on Weights and Measures – CGPM (Conferérence Générale des Poids et Measures). The modern system is actually called the International System of Units or SI. SI is abbreviated from the French Le Système International d’Unités and grew from the original metric system. Today, most people use the name metric and SI interchangeably, with SI being the more correct title.

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Pigments in Our Lives

Whenever you paint a picture or a room, or use inks or cosmetics, you use pigments. A pigment

is a substance that gives a color to another material. Most pigments are a mixture of a powder

and a colorless solvent.

On the front cover of this book, you can see examples of inorganic pigments that are

obtained from powdered minerals of different chemical elements. Cadmium in cadmium orange,

chromium in chrome yellow, cobalt in cobalt violet, iron in red ocher, manganese in manganese

purple. However, the elements chromium and cadmium are toxic and have been replaced by

nontoxic pigments.

Organic pigments containing chains of the element carbon are obtained from plants and

animals. Indigo dye from the plant Indigofera tinctoria is an organic compound with a deep,

blue color used to color blue jeans and fabrics. Carbon black is a powdered form of the element

carbon used to color plastics, tires, inks, and paints.

Color is seen when a pigment absorbs certain wavelengths of visible light and reflects

the remaining wavelengths as a color. For

example, a pigment that absorbs red and

green light, and reflects the blue wavelengths,

has a blue color. If a substance absorbs green

light but relects red and blue wavelengths,

it appears to have a violet color. A leaf

with chlorophyll pigment is green because

all wavelengths in sunlight are absorbed

except green.

Mastering™ Chemistry is a learning platform designed with you

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videos, interactive self-assessments, and more—all accessible on any device

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Timberlake

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Sixth Edition

ISBN-13: 978-0-13-487811-9

ISBN-10: 0-13-487811-6

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