2. 10-1 Classifying Matter

3. 1. The atoms in all objects are the same. 2. You cannot always tell by an object’s appearance whether it is made of more than one type of atom. Do you agree or disagree?

4. What is a substance? How do atoms of different elements differ? How do mixtures differ from substances? How can you classify matter? Key Concepts

5.  Matter is anything that has mass and takes up space. Matter  Everything you can see is matter, but some things you cannot see, like air, are also matter.  An atom is a small particle that is a building block of matter. atom

6. Atoms At the center of an atom is the nucleus. Protons, which have a positive charge, and neutrons, which have no charge (or a neutral charge), make up the nucleus.

7.  Atoms  Electrons are negatively charged particles that move quickly throughout the area around the nucleus called the electron cloud.  Not all atoms have the same number of protons, neutrons, and electrons.  Atoms that have different numbers of protons have different properties.

8.  Cut out the subatomic particles foldable  Fold on the dotted line so that you can see the words protons, neutrons, and electrons  Using a glue stick, place glue on the back and place onto page 7 In your Interactive Science Notebook:

9.  Draw where you would find protons on the proton flap and do the same for the neutrons and electrons  Underneath write and complete  Charge:  Location:

10.  There are two main classifications of matter: -Substances  Mixtures A substance is matter with a composition that is always the same. Substances are always made up of one or more atoms in the same combinations. Two types of substances are elements and compounds

11.  Make a list of 10 substances

12.  Element: substance that consists of just one type of atom  Because there are about 115 known elements, there are about 115 different types of atoms.  Each type of atom contains a different number of protons in its nucleus. The number of protons in an atom is the atomic number of the element

13. Periodic Table of Elements

14.   Element Name   Atomic # (# of protons)   Element Symbol   Atomic Mass

15.  Atomic Number = # of protons and electrons  # of Neutrons= Atomic Mass - Atomic Number Periodic Table

16.  Cutout, fold the flap over and glue the flap of the Periodic Table onto pg. 8.  Repeat for APE and MAN, Glue flap onto flap of Periodic Table  Repeat for Element Box, glue flap onto APE and MAN In your Interactive Science Notebooks

17.  The atoms of most elements exist as individual atoms.  For example a roll of pure aluminum foil consists trillions of individual aluminum atoms  But the atoms of some elements exist in groups  Oxygen atoms in the air naturally exist in pairs  Whether the atoms of an element exist individually or in groups, each element contains only one type of atom. Therefore, its composition is always the same.

18. Each element on the periodic table consists of just one type of atom.

19.  Compound: type of substance containing atoms of two or more different elements chemically bonded together.  The combination of symbols and numbers that represents a compound is called a chemical formula. Compounds

20. The combination of symbols and numbers that represents a compound is called a chemical formula.

21.  Chemical formulas show the different atoms that make up a compound, using their element symbols.  Chemical formulas also help explain how the atoms combine.  A compound often has different properties from the individual elements that compose it.

22.  A mixture is matter that can vary in composition. mixture  Mixtures are combinations of two or more substances that are physically blended together.  The amounts of the substances can vary in different parts of a mixture and from mixture to mixture. Mixtures

23.  A heterogeneous mixture is a type of mixture in which the individual substances are not evenly mixed. heterogeneous mixture  Because the substances in a heterogeneous mixture are not evenly mixed, two sample of the same mixture can have different amounts of the substances. Types of Mixtures

24.  A homogeneous mixture is a type of mixture in which the individual substances are evenly mixed homogeneous mixture  In a homogeneous mixture, the particles of individual substances are so small and well-mixed that they are not visible, even with most high-powered microscopes. Types of Mixtures

25.  Make a list of 5 heterogeneous mixtures, and a list of 5 homogeneous mixtures In your ISN

26.  To dissolve means to form a solution by mixing evenly. dissolve  A homogeneous mixture is also known as a solution. Mixtures

27. How do mixtures differ from substances? In your ISN

28.  The composition in a compound does not vary. Therefore, a chemical formula can be used to describe the compound.  Because composition in a mixture can vary, a chemical formula cannot be used to describe mixtures. Compounds vs. Solutions

30.  A substance has the same composition throughout.  A substance is either an element or a compound. Summary

31.  An atom is the smallest part of an element that has its properties. Atoms contain protons, neutrons, and electrons.  The substances in a mixture are not chemically combined. Mixtures can be either heterogeneous or homogeneous. Summary

32. A.atom B.element C.mixture D.substance Which term describes matter that can vary in composition?

33. Lesson 1 – LR2 A.atomic number B.chemical formula C.mixture D.substance What is the combination of symbols and numbers that represent a compound?

34. A.homogeneous mixture B.heterogeneous mixture C.chemical formula D.compound Which term refers to a type of substance containing atoms of two or more different elements chemically bonded together?

35.  The atoms in all objects are the same.  You cannot always tell by an object’s appearance whether it is made of more than one type of atom. What do you think now?