Earth’s Chemistry Chapter 4. Matter Matter = the substances of which an object is made. Matter = the substances of which an object is made. Matter is.

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Presentation transcript:

Earth’s Chemistry Chapter 4

Matter Matter = the substances of which an object is made. Matter = the substances of which an object is made. Matter is anything that takes up space and has mass. Matter has 2 distinguishing properties: Physical --- can be observed without changing the substance. (Ex. Density, boiling point, etc.) Physical --- can be observed without changing the substance. (Ex. Density, boiling point, etc.) Chemical --- how a substance interacts with other substances to produce different kinds of matter. (Ex. Iron interacts with oxygen to form rust) Chemical --- how a substance interacts with other substances to produce different kinds of matter. (Ex. Iron interacts with oxygen to form rust)

Atomic Structure Smallest particle or unit of an element Atoms are made of smaller parts ---- protons, neutrons, and electrons Protons positively charged Neutrons ---- no charge (neutral) Electrons ---- negatively charged Protons and Neutrons found in the nucleus --- NOT ELECTRONS --- found outside in electron clouds

Atomic number = equals the number of protons in the atom. An uncharged atom has the same amount of protons & electrons so there’s no charge. It’s said to be neutral Example --- Oxygen has an atomic number of 8 so it has 8 protons & 8 electrons Atomic mass number = protons + neutrons Protons & neutrons have an atomic mass of 1

Isotopes Some atoms don’t have the same number of neutrons Each additional neutron increases the mass number. Isotopes = atoms of the same element that differ from each other by mass number.

Examples of Isotopes

Elements All matter is made up of elements. Element = any substance that can’t break down any further (Ex. oxygen, iron, nitrogen, etc.). Periodic table --- made up of elements. Universal symbol for elements --- consists of either one letter or two (Note how it’s written) Over 90 elements occur naturally; others have been created.

Elements in Earth’s Crust

Solids, Liquids, & Gases Solids = particles that make this up are packed tightly together in fixed positions Solids have definite shape & volume Liquids = have definite volume but not shape Liquids take the shape of the container Particles tightly packed, but move freely in relation to each other Gases = No definite shape or volume Particles farther apart & move more freely & faster

Combinations of Atoms Compound or more elements bonded together. Example of a compound--- Water Water is made up of the elements hydrogen and oxygen. Molecule --- smallest unit of a compound.

Chemical Bonds Chemical bonds = forces that hold atoms together to make compounds Ionic bonds = electrons are transferred from one atom to another Ion = an atom or group of atoms that carry an electrical charge ( positive or negative) Covalent bond = share electrons Chemical formulas = a representation of a compound (Ex. H 2 O)

Mixture vs. Solution Mixture = a material that contains 2 or more substances that are not chemically combined Solutions = a mixture in which one substance is uniformly dispersed in another substance.