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    Painless Chemistry
    Painless Chemistry
    Painless Chemistry
    Ebook348 pages3 hours

    Painless Chemistry

    By Barron's Educational Series and Loris Chen

    ()

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    About this ebook

    Barron's makes learning Chemistry fun and PAINLESS!

    Learning at home is now the new normal. Need a quick and painless refresher? Barron’s Painless books make learning easier while you balance home and school. 

    Painless Chemistry provides lighthearted, step-by-step learning and includes:
    • Complex topics broken down with examples and illustrations, including atomic theory, chemical bonding, the structure of molecules, and more
    • The Periodic Table of Elements and how it offers the key to understanding Chemistry
    • Painless tips, instructive tables,“Brain Tickler” quizzes and answers throughout each chapter, and more.
    LanguageEnglish
    PublisherBarrons Educational Services
    Release dateAug 26, 2020
    ISBN9781506268095
    Painless Chemistry

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      Book preview

      Painless Chemistry - Barron's Educational Series

      Chapter 1

      Matter

      Energy or Matter

      Chemistry is the division of physical science that studies the composition, properties, and reactions of substances. The nature of matter and energy have been investigated and debated from ancient times.

      Our universe is composed of energy and matter. Energy is the ability to do work. In chemical reactions, chemical energy is interconverted with other types of energy, such as light, heat, and electricity.

      Matter has mass and inertia. Matter also takes up space (volume). The amount of matter in a specified space is density. For pure substances, density at a specific pressure and temperature is an identifying characteristic of the substance.

      Mass

      Mass is the amount of matter in an object. The basic unit of mass is the kilogram. One gram is the approximate mass of a 5-cm (2-inch) steel paper clip. A kilogram is 1,000 grams (2.2 pounds). One liter of water has a mass of 1 kilogram.

      Common tools for measuring mass are the double pan balance, triple beam balance, and electronic balance. The double pan balance compares the mass of a substance to a known standard mass (a metric weight). The triple beam balance has an arm with sliding mass units that are adjusted to balance the mass of a substance. The electronic balance provides a digital measurement of the mass of a substance.

      Mass versus weight

      Weight is a measure of the pull or acceleration of gravity on an object’s mass (w = mg, or weight equals mass times the acceleration of gravity). The acceleration of gravity near Earth’s surface is 9.8 m/sec². The weight of an object can change if gravity changes. The amount of matter in an object does not change even if the pull of gravity changes. Therefore, the mass of an object does not change even if the pull of gravity changes.

      In many countries, the kilogram (kg) is commonly used to express weight. In science, kilogram is a metric unit of mass. The newton is a metric unit of weight, and is defined as the force needed to accelerate 1 kilogram of mass at a rate of 1 meter per second per second. One newton equals 1 kg · m/sec². Another unit of force is the pound. One pound of force is about 4 newtons.

      Sometimes in chemistry the term weight is used when mass is meant. Be careful to pay attention to units of measure.

      PAINLESS TIP

      Mass and Weight

      Mass is the amount of matter in a substance.

      The basic metric unit of mass is the kilogram.

      Weight is the pull of gravity on an object.

      The basic metric unit of weight is the newton.

      On Earth 1 kilogram exerts a force of 9.8 newtons.

      BRAIN TICKLERSSet # 1

      1.What is the total mass of the marbles shown in the illustration?

      2.If each of the 10 glass marbles on the scale has the same mass, what is the average mass of a single marble? Show your calculation.

      3.A brass plate has a mass of 2 kilograms on Earth. The gravity of the moon is one-sixth that of Earth’s gravity. What is the mass of the brass plate on the moon? Explain your answer.

      (Answers are on page 16.)

      Volume

      Volume is the space that matter occupies or takes up. Volume is measured in three dimensions: length, width, and height. A common tool for measuring the volume of a regularly shaped solid is the metric ruler or meter stick. Common units of measure for solids are cubic centimeters (cm³) and cubic meters (m³).

      A common tool for measuring liquid volume is the graduated cylinder. The volume is measured at the bottom of the meniscus, or curve of the liquid in the cylinder. Common measures of liquid volume are the milliliter (ml) and liter (l). One milliliter is equal to 1 cubic centimeter (cm³). A liter is 0.26 gallons, or a little more than a quart.

      Figure 1–1. Measuring tools

      VOLUME

      Figure 1–2. Cube

      Volume is the space that a substance occupies.

      Volume of a Regular Object

      The volume of a regular object can be calculated by multiplying the length by the width by the height of the object.

      Rectangular Objects

      Volume = L × H × W

      Spherical Objects

      Volume = 43 π r³

      Cylindrical Objects

      Volume = π r²h

      Volume of an Irregular Object

      The volume of an irregular object can be measured using a graduated cylinder containing a known amount of water. When the object is lowered into the cylinder, it will displace a volume of water equal to the volume of the object. This is called the water displacement method of measuring the volume of an irregular object.

      BRAIN TICKLERS Set # 2

      1.An irregularly shaped chunk of granite was lowered into a graduated cylinder containing 30 milliliters of water. The volume increased to 34 milliliters. What is the volume of the granite chunk?

      2.What is the volume of the box? Include the unit of measure in your answer.

      3.What tool would you use to measure the length, width, and height of the box?

      4.The radius of a metal ball is 2 cm. What is the volume of the ball? Describe two ways to find the volume of the ball.

      (Answers are on page 16.)

      Density

      The amount of matter in a given space is the density of the matter. Density is a calculated physical property of matter that is derived from measurements of mass and volume. Density is mass divided by volume.

      Figure 1–3. Density diagram

      Substance A and substance B have the same volume, 1 cm³.

      Substance A has a mass of 24 grams. Substance B has a mass of 12 grams. The density of substance A is 24 g/cm³ and the density of substance B is 12 g/cm³.

      Figure 1–4. Density of A and B

      This means that substance A is denser than substance B. In other words, there is more matter in the same amount of space.

      Under normal conditions, a sample of a solid or liquid has a definite mass and volume. Because density is a ratio of mass to volume, the density of a pure solid or liquid substance is constant regardless of the size of the sample.

      Density can be used to identify a pure solid or liquid substance. All samples of substance A will have a density of 24 g/cm³ regardless of the volume of the sample. All samples of substance B will have a density of 12 g/cm³ regardless of the volume of the sample.

      Gases can be compressed. A sample of a gas has a definite mass, but the volume can vary, depending on temperature and pressure. For density to be an identifying property of a gas, the pressure and temperature need to be specified.

      PAINLESS TIP

      Figure 1–5. Density formula

      BRAIN TICKLERS Set # 3

      1.A sample of metal has a mass of 5.4 grams and a volume of 2.0 cm³. What is the density of the sample?

      a.10.8 g/cm³

      b.2.7 g/cm³

      c.3.4 g/cm³

      d.7.4 g/cm³

      2.If the density of a post-1982 penny is approximately 6.94 g/cm³ and the mass is 2.5 g, what is the volume of the penny?

      3.The density of pure copper is 8.96 g/cm³. Is the penny described in #2 made of pure copper? Explain your answer.

      (Answers are on pages 16–17.)

      Metric Units of Measure

      The metric system is based on multiples of 10. This makes conversions between small units and larger units easy. It can be done by sliding the decimal point to the left or right. Common prefixes are shown in the table.

      PAINLESS TIP

      To go from a small unit to a larger unit, move the decimal to the left.

      1 meter = 0.001 kilometers

      To go from a large unit to a smaller unit, move the decimal to the right.

      1.000 kilogram = 1000 grams

      Common units of metric measure

      BRAIN TICKLERSSet # 4

      1.A drink bottle contains 250 ml of water. How many liters of water does the bottle contain?

      a.2.50 liters

      b.25.0 liters

      c.0.025 liters

      d.0.250 liters

      2.If the volume of a quarter is 808.93 mm³, what is the volume in cubic centimeters (cm³)?

      a.0.080893 cm³

      b.0.80893 cm³

      c.8.0893 cm³

      d.80.893 cm³

      3.If a metric mass is labeled 1.5 kg and a post-1982 penny has a mass of 2.5 g, approximately how many pennies would it take to balance the metric mass?

      (Answers are on page 17.)

      Modern Atomic Theory

      In the early 1800s, John Dalton reviewed the major discoveries of other scientists and proposed a theory that matter was composed of indivisible particles called atoms. Since that time, research has added to our understanding of the structure of the atom. Although the atom is now known to be composed of smaller subunits, it is still considered to be the fundamental complete building block of matter.

      Characteristics of atoms

      1.Atoms are composed of electrons, protons, and neutrons. Protons and neutrons, in turn, are composed of quarks.

      2.In any element, all the atoms have the same number of protons but can have a different number of neutrons. Atoms of an element with a different number of neutrons are called isotopes.

      3.Atoms of different elements have a different number of protons.

      4.Atoms of two or more elements can combine to form compounds.

      5.The atomic mass of an element is the average mass of all its isotopes.

      6.In a compound, atoms are combined in a constant ratio.

      Parts of the atom

      In 1897, English physicist Joseph John (J. J.) Thomson (1856–1940) discovered the electron. The electron has a negative charge and an extremely tiny mass. The motion of the electron generates both an electric and a magnetic field. Thomson proposed the plum pudding model of the atom in which negatively charged particles were randomly distributed within a pudding of positively charged particles. Thomson’s graduate student Ernest Rutherford later disproved this model.

      In 1909, Rutherford conducted a series of experiments in which he bombarded a thin sheet of gold foil with alpha particles. Most particles passed through the foil, whereas a few were scattered back. Because most particles passed through the foil, Rutherford concluded that the volume of the atom was mostly empty space, and that negative electrons circled around a dense positive core.

      In 1919, Rutherford discovered the proton, a positively charged particle with a mass approximately 1836 times greater than the mass of an electron. The proton is at the center of a cloud of electrons.

      In 1932, English physicist James Chadwick discovered the neutron, a neutrally charged particle that has a mass slightly greater than that of the proton. Chadwick suggested that there was a strong force that held neutrons and protons together in the nucleus, or center, of the atom.

      Figure 1–6. Proton, neutron, electron

      In 1915, Danish physicist Niels Bohr (1885–1962) developed an atomic model in which electrons are organized in energy shells around a nucleus of protons and neutrons. His planetary atomic model is not entirely correct, but it simplifies atomic structure for the beginning chemistry student.

      Figure 1–7. Atomic structure

      Protons and neutrons are in the core of the atom. They form the nucleus. Electrons are organized into energy shells that surround the nucleus. Each shell contains orbitals in which the electrons reside. Electron arrangment is sometimes described as an electron cloud. The outermost energy shell that contains electrons is called the valence shell.

      All particles of the atom vibrate. The frequency of vibrations can be used to identify specific atoms and to study the molecular spectra, heat capacity, and heat conduction of materials made from a combination of atoms.

      In 1935, Japanese physicist Hideki Yukawa (1907–1981) proposed that protons and neutrons are composed of smaller particles. In 1973, Murray Gell-Mann (1929– 2019) led the development of the quark theory. There are six types of quarks. Up and down quarks are the fundamental building blocks of protons and neutrons. The sum of the quark charges explains the charges of the proton and neutron.

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