Section 1: Classifying Matter
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1 Section 1: Classifying Matter Preview Key Ideas Bellringer What is Matter? Elements Elements in the Human Body Compounds Pure Substances and Mixtures Types of Mixtures
2 Key Ideas How can matter be classified? Why are carbon and copper classified as elements? How are elements related to compounds? What is the difference between a pure substance and a mixture?
3 Bellringer Chemists and other scientists write the element names so often that they have developed a system of short symbols. Most of the symbols are one or two letters taken from the element s name. Some of the elements have symbols that derive from their Latin names. What is important about knowing the symbols is that scientists from all over the world are able to communicate, no matter what language they speak.
4 Bellringer, continued 1. Complete the right column of the table below, using the following names: boron, bromine, calcium, magnesium, neon, nitrogen, silicon, sulfur, zinc.
5 Bellringer, continued 2. Today, there are rules for how a newly discovered element is to be named. However, in earlier times, elements were named for people, places, and foreign words, among other things. Match each element to how it was named. You may also use an element s symbol as a clue. Write the correct letter in the space provided. Berkelium (Bk) Curium (Cm) Einsteinium (Es) Gold (Au) Krypton (Kr) Iron (Fe) Iodine (I) Titanium a. Noble Prize winner who studied relativity b. Latin name (ferrum) c. powerful mythological beings d. home of the university in California where the element was first made e. Greek word for violet (iodes) f. Nobel Prize winner who studied radioactive elements g. Greek word for hidden (kryptos) h. Latin name (aurum)
6 What is Matter? How can matter be classified? Every sample of matter is either an element, a compound, or a mixture. matter: anything that has mass and takes up space
7 Visual Concept: Matter
8 Elements Why are carbon and copper classified as elements? Each element is made of one kind of atom. element: a substance that cannot be separated or broken down into simpler substances by chemical means atom: the smallest unit of an element that maintains the properties of that element
9 Elements in the Human Body
10 Elements, continued Elements are represented by symbols. Atoms that make up a molecule act as a unit. molecule: a group of atoms that are held together by chemical forces; a molecule is the smallest unit of matter that can exist by itself and retain all of a substance s chemical properties.
11 Visual Concept: Elements
12 Compounds How are elements related to compounds? Each molecule of a compound contains two or more elements that are chemically combined. Elements combine chemically to form a compound. compound: a substance made up of atoms of two or more different elements joined by chemical bonds
13 Visual Concept: Compounds
14 Compounds, continued Compounds have unique properties. Chemical formulas represent compounds. The following chemical formula represents the compound The following chemical formula represents the compound for indigo:
15 Visual Concept: Chemical Formula
16 Pure Substances and Mixtures What is the difference between a pure substance and a mixture? Elements and compounds are pure substances, but mixtures are not. pure substance: a sample of matter, either a single element or a single compound, that has definite chemical and physical properties mixture: a combination of two or more substances that are not chemically combined
17 Pure Substances and Mixtures, continued Mixtures are classified by how thoroughly the substances mix. heterogeneous mixture: substances aren t mixed uniformly and are not evenly distributed homogeneous mixture: substances are evenly distributed, and the mixture is the same throughout miscible: substances that can be mixed immiscible: substances that cannot be mixed Gases can mix with liquids.
18 Types of Mixtures
19 Visual Concept: Comparing Miscible and Immiscible Liquids
A pure substance that cannot be broken down into simpler substances Elements are made up of identical atoms
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