2 Quick ReviewThose itty bitty particles of matter? Do you remember their name?The basic building block of all matter?ATOM
3 Matter EVERYTHING! All matter is made of atoms If it has mass and occupies space then it is matter and made of atomsYou, the air, your desk, your book, your pencil, your dog, your cat, your food, your teacher, your school, the trees, your house, the dirt, rocks, and even the vacuum cleaner that you are supposed to use to clean your room – but never do!EVERYTHING!(Except Energy)
4 Classifying Matter ELEMENT COMPOUND Just like the letters of the alphabet are the building blocks of words – atoms are the building blocks of matterAtoms are put together to form different types of matter, just like letters are put together to form different types of wordsIf the matter is made of the same type of atom, it is called anELEMENTIf the matter is made of 2 or more kinds of atoms joined chemically, it is called aCOMPOUND
5 Models of Atoms Since we cannot see an atom, we can use models. For instance:You will notice that each container only has one type of particle, or atomSome atoms always have a buddy, some are loners.These containers contain elementsHow can you tell?
6 Models of CompoundsThese containers illustrate compounds – 2 or more different atoms, or elementsAtoms aren’t really different colors, but it makes the models easier to understand.Can you figure out how many different elements are in each container?
7 Check Understanding Can you figure out what is in each container? Look closely. Do you see elements, compounds, or both?
8 ElementsThere are 90 naturally occurring kinds of atoms. These are called elementsScientists in the lab have been able to make about 25 more (not naturally occurring)Is there a list or a chart or a table?OF COURSE
9 ElementsElements are represented by a symbol of 1 or 2 letters. The 1st letter is always upper case, the 2nd is always lower caseSome symbols are easy to rememberOthers not so easy
10 Compounds Compounds are represented by 2 or more elements Which box would represent H2O? CO2?
11 Pb O2 HCl H2SO4 Element or Compound? How can you tell if a substance is an element or a compound when written in letters?Count the number of capital letters!If there is only one – it is an elementIf there is more than one – it is a compoundLet’s try some…..PbO2HClH2SO4
12 Chemical Change EQUATION How do elements become compounds and how do compounds become elements?Remember: in a chemical change, new substances are formed with different properties.Scientists have a special way of explaining chemical changes. It is called anEQUATION
13 Chemical Equations Are Easy! The reactants are the elements or compounds you begin withThe products are the elements or compounds you end withThe before and after are separated by an arrow.For instance:Sodium combines with chlorine to produce sodium chloride, or saltIn scientific shorthand it isNa Cl NaCl
14 Your Turn Write a Chemical Equation Write a chemical equation for each of these. Indicate which are elements and which are compounds.Hydrogen (H2) reacts chemically with oxygen (O2) to produce water (H2O)When the reactants, carbon (C) and oxygen, undergo a chemical change, carbon dioxide (CO2) is producedSugar (C6H12O6), with the help of oxygen, is broken down by the body to produce carbon dioxide and water.
15 This equation illustrates a chemical reaction or chemical change. Your Turn Again!This equation illustrates a chemical reaction or chemical change.Write this equation in words. Indicate what substances reactants, products, elements and compounds.
16 RememberElements and compounds can be represented by symbols or formulasElements are only one kind of atom, and compounds are one or more elements or kinds of atoms.Chemical equations are a scientists’ shorthand for explaining a chemical reaction/change.When matter undergoes a chemical change, new substances are formed with different properties.
17 Output Page IdeaLike using the letters of the alphabet to make words, can you use the symbols for the elements to make words?Use yourTry toThis can beOOOHH! If have one: