Living By Chemistry Unit 1: ALCHEMY Matter, Atomic Structure, and Bonding.
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Transcript of Living By Chemistry Unit 1: ALCHEMY Matter, Atomic Structure, and Bonding.
In this unit you will learn:
• what matter is composed of• to use the language of chemistry• to decode information contained in
the periodic table• how new substances with new
properties are made• what holds substances together
Section I: Defining Matter
Lesson 1 Tools of the TradeLesson 2 A Penny for Your ThoughtsLesson 3 What’s the Matter?Lesson 4 Mass CommunicationLesson 5 All That Glitters
ChemCatalyst
List at least four tools or pieces of equipment you think a chemist might use in a chemistry lab.
You will be able to:
• recognize common chemistry tools and equipment that you will be using in the course
• find all the safety equipment in the laboratory and understand its use
• understand the rules of safety in the chemistry laboratory
Discussion Notes
Safety Equipment:
fire blanket first aid kit
fire extinguisher aprons/lab coats
eye wash shower
safety goggles hood
Wrap Up
What tools and equipment do chemists use?• Chemists have a set of tools that are
useful for studying matter.• Chemistry laboratories have a number of
potential hazards.• Chemists know the safety rules and how to
use the safety equipment.
Check-in
1. Sketch or describe these items.
2. Where are these items located in your classroom?
graduated cylinder
test tube rack
Erlenmeyer flask balance or scale
eye wash fire extinguisher
ChemCatalyst
Long ago, early scientists tried to turn ordinary things into gold. This pursuit was called alchemy, and the people who engaged in alchemy were called alchemists.Do you think these early scientists were successful in turning things into gold? Explain your thinking.
You will be able to:
• observe a procedure and write observations
• define and formulate a hypothesis to explain observed phenomena
• define chemistry and begin to describe what chemists study
Discussion Notes
To determine whether the new penny is gold, you need to study its properties.
Property: A characteristic of a substance.
Physical Properties: color, hardness, size, weight
Chemical Properties: how a substance reacts
Discussion Notes (cont.)
Chemistry: The study of substances, their properties, and how they can be transformed. The study of matter and how matter can be changed.
Discussion Notes (cont.)
Scientists use a systematic approach to solve problems in science.
Hypothesis: A testable explanation for an observation.
Wrap Up
What is chemistry?• Chemistry is the study of what substances
are made of, how they behave, and how they can be transformed. It is the study of matter and how matter can be changed.
• A hypothesis is a testable explanation for an observation.
• Scientists use a systematic approach to solving problems in science.
ChemCatalyst
Modern chemistry is defined as the study of matter.1. What do you think matter is?2. Name two things that are matter and
two things that are not matter.
Discussion Notes
The items that are clearly matter are all objects, or things, that are tangible.
Energy and ideas are not matter, but they involve matter.
Matter has some sort of dimension and substance to it.
Discussion Notes (cont.)
A good definition should work 100% of the time.Here are some textbook definitions of matter:
Matter: Anything that has substance and takes up space.
Matter: Anything that has mass and volume.
Wrap Up
What is matter?• Matter is everything that has substance and
takes up space, or that has mass and volume.
• Ideas and energy are examples of things that are not matter.
• Chemists study all kinds of matter.
Check-in
Which of the following can be classified as matter?
a. a beam of sunlight b. an automobilec. an idea d. your breathe. rain f. sadness
ChemCatalyst
1. Which has more mass and weighs more, 5 kilograms of bricks or 5 kilograms of feathers? Explain your thinking.
2. Would it hurt more to be hit with 5 pounds of feathers or 5 pounds of bricks? Explain your thinking.
You will be able to:
• measure mass using a balance• measure the volume of regularly and
irregularly shaped objects
Prepare for the Lab (cont.)
In this lab, you will be measuring volume with a graduated cylinder.
To the nearest hundredth of a milliliter, the volume of liquid is 5.52 mL.
Discussion Notes (cont.)
Volume is a measure of the amount of space occupied by something.
1000 mL = 1 L
Mass: A measure of the quantity of matter in an object.
Volume: The amount of space a sample of matter occupies.
1 mL = 1 cm3
Wrap Up
How do you determine the masses and volumes of substances?• Mass is a measure of the amount of
substance. Mass can be measured using an electronic or triple beam balance.
• Volume is the amount of space occupied by an object. The volume of a liquid can be measured in a graduated cylinder.
• Objects with similar volumes can have different masses, and vice versa.
Check-in
A penny has a mass of 2.498 g.a. What is the mass to the nearest tenth of a gram?b. How would you determine the volume of a penny?c. What is the difference between mass and
volume?d. Suppose you find that the golden penny has a mass of 2.6 g. If you compare it with the mass of this penny, what can you conclude?
ChemCatalyst
In the year 250 B.C.E., King Hiero commissioned a goldsmith to make him a crown out of pure gold. However, when he received the crown, he suspected that the goldsmith had taken some of the gold and replaced it with a cheaper metal, even though it still weighed the same. He asked Archimedes to determine whether the crown was solid gold.How do you think Archimedes determined whether the crown was solid gold?
You will be able to:
• define density as the amount of mass in a certain space, or mass per unit volume
• solve problems for density, mass, or volume using the equation D = m/V
• explain how and why density can be used to identify a substance.
Discussion Notes
Extensive property: A characteristic that is specific to the amount of matter.
Intensive property: A characteristic that does not depend on the size or the amount of matter.
Density: The mass of a substance per unit volume. D = m/V, where D is density, m is mass, and V is volume. Density is usually reported in g/cm3 or g/mL.
Discussion Notes (cont.)
Common materials and their densities.
Material Density Material Density
zinc 7.1 g/cm3 gold19.3 g/cm3
paper 0.9 g/cm3 brass 8.4 g/cm3
water 1.0 g/mL copper 9.0 g/cm3
aluminum
2.7 g/cm3 lead11.4 g/cm3
Wrap Up
How can you use mass and volume to determine the identity of a substance?• One substance can be distinguished from
another by examining its intensive physical properties, such as density.
• Density is a measure of the mass per unit volume of a substance.
• The density of any given substance is always the same (as long as the temperature remains constant).