Describing Chemical Reactions Chemical Formulae:.

Slides:

Advertisements

Similar presentations

COUNTING ATOMS.

Advertisements

CHEMICAL COMPOUNDS AND FORMULAS

Page 30: Counting Elements and Atoms Practice Page 31: Review of Elements and Compounds.

CHEMICAL EQUATIONS. Chemical equations  You are expected to know these names and formula: NameFormulaNameFormula WaterH2OH2OHydrchloric Acid HCl Carbon.

Chemical Symbols, Formulas & Equations. Chemical Symbols A symbol represents one element (1-3 letters) Symbol Writing Rules 1 st letter is always capitalized.

Building Skills 3 pp Practice Problems. For each formula, name the elements present and give the number of atoms of each element. BaF 2.

Writing Ionic Formulas

COMPOUNDS. Compounds Pure substances that are made of more than one element are called compounds (molecules) Compounds are two or more elements chemically.

Ionic and Covalent Bonds Science 10 Ms. Lowrie. Using Lewis Diagrams to Show: Covalent Bonding Steps: 1. Draw a Lewis diagram for both elements 2. Determine.

Common Elements of the Earth and Livings Things

Chemical Formulas and Counting Atoms

Compounds Chemistry Lecture #3 Elements Entangled Element – the simplest type of pure substance Pure substances that are made of more than one element.

Counting Atoms and Balancing Chemical Equations. Identifying Compounds Each new element is identified by a capital letter Each new element is identified.

Percent Composition (Section 11.4) Helps determine identity of unknown compound –Think CSI—they use a mass spectrometer Percent by mass of each element.

WHAT ARE THEY AND WHERE ARE THEY FOUND? COMMON COMPOUNDS.

Chemical Reactions & Review Problems. 2KClO 3 2KCl + 3O 2 Element Symbol Element NameElement Subscript Times X Coefficient Number Total # of atoms K potassium.

18 Bohr Models Lesson 3.1 Extension. Element Name: _______________________ Chemical Symbol: _______Atomic Number: _______ Diagram the Bohr atom which.

Chemical Formulas. Molecules and Compounds 4 A molecule is two or more atoms that are bonded together. –H 2, O 2, N 2, H 2 O, CO 2 4 A compound is two.

Percent Composition (Section 11.4) Helps determine identity of unknown compound –Think CSI—they use a mass spectrometer Percent by mass of each element.

BELLRINGER 1. What is the chemical formula for water? 2. How many hydrogen atoms are in a water molecule? 3. How many oxygen atoms are in a water molecule?

Periodic Table of the Elements. Select an element = Internet link ()

Using ion models to determine chemical formulas

Rules For Writing Chemical Formulas and Naming Compounds IPC 2007.

Writing Ionic Formulas Calcium Chloride Locate the metal on the periodic table and write the element symbol with its oxidation number. Ca +2.

Bromine Calcium Carbon Chlorine Cobalt Copper Gold Hydrogen Iodine Iron Lead Nitrogen Nickel Mercury Magnesium Aluminum Oxygen Phosphorus Silver Sodium.

Chemical Formulas and Moles. Example: 1.water (C) – every molecule of water contains 2 atoms of hydrogen & one atom of oxygen - 2 molecules of H 2 O would.

BALANCING CHEMICAL EQUATIONS Chapter 6.5 DAY 1 & 2.

Slide 1 Section 3.2 Atoms & Compounds Objectives  To learn about Dalton’s Theory of atoms  To understand and illustrate the Law of constant composition.

Compounds. Compound: a substance made up of atoms of different elements joined together (involves a chemical change) a substance made up of atoms of different.

Review of Elements #1-20 Good Luck!! FabulousFunFriskyDr. Evil

How to Count Atoms Review

Two Men walk into a Bar The first guy says, “I’ll have some H 2 0.” The second guy says, “I’ll have some H 2 O too.” The second guy dies.

Lecture: Molecules and Compounds. Compounds and Molecules: A chemical structure that is made of two or more atoms that are bonded together.

Name as many elements as you can that you encounter in your everyday life. Where are they found?

Warm Up Name all of the major elements that make up the earth, the living matter, the oceans, and the atmosphere. Objective: I will be able to recognize.

(2.3)Conservation of Mass

Big Idea: Given a chemical formula be able to count the number of atoms for each element in the compound or molecule. Counting Atoms in Compounds or Molecules.

Intro to Names and Formulas for Ionic Compounds November 2, 2015.

What is a chemical reaction? chemical reaction- when one or more substances changes into one or more new substances Two important key terms in a chemical.

Balancing Chemical Equations. Balanced Equation Atoms can’t be created or destroyed Atoms can’t be created or destroyed Law of Conservation of Mass Law.

Do Now Identify if the following is a physical change or chemical change. 1)Cookie dough was put into the oven and the cookies are baking and rising in.

Bell Ringer The Law of conservation of Mass says what? Name 6 possible ways you can tell if a chemical reaction has taken place. What is a subscript? What.

How to count atoms 1.The symbol of an element represents one atom of that element. Ex: Ba, Cl, ….etc. 2.A subscript is a number written at the lower right.

How do we make larger particles than atoms?. SYMBOL- shorthand for one atom of an element SUBSCRIPT- Lower right corner (behind the symbol) Tells you.

COUNTING ATOMS. RULES FOR COUNTING ATOMS 1.SUBSCRIPTS only refer to the atom that they are BEHIND. For example… H 2 S There are TWO atoms of HYDROGEN.

What is the chemical symbol of Hydrogen? H. What is the chemical symbol of Carbon? C.

Balancing Equations. Chemical Reactions   All chemical reactions can be represented by an equation.   The arrow means that a reaction has taken place.

Now try this! Compounds. Which of these are chemical reactions? Melting Ice Boiling water Burning Carbon Lighting Fireworks Baking bread.

Chemical Formulas and Equations. Parts of a formula Coefficient: the number in front of the symbol, which tells you how many molecules there are. Subscript:

Balancing Chemical Equations

COUNTING ATOMS.

Writing Chemical Formulas

Balancing Chemical Equations notes for p. 8-10

Balancing Chemical Equations

How to Count Atoms.

CHEMICAL EQUATIONS.

COUNTING ATOMS Assignment #2

Counting Atoms Every chemical formula tells you how many atoms of each element there are in a compound. Important because if you can count atoms, you can.

Monday September 17th, 2012 List 2 examples of a Compound Element.

Modelling Chemical Reactions

COUNTING ATOMS.

COUNTING ATOMS school. judsonisd

COUNTING ATOMS.

COUNTING ATOMS.

COUNTING ATOMS.

COUNTING ATOMS.

COUNTING ATOMS.

COUNTING ATOMS.

Counting Atoms COUNTING ATOMS

Presentation transcript:

Describing Chemical Reactions Chemical Formulae:

Describing Chemical Reactions Chemical Formulae: 1. suffix indicates the # of atoms e.g. H 2 O

Describing Chemical Reactions Chemical Formulae: 1. suffix indicates the # of atoms e.g. H 2 O2 hydrogen 1 oxygen

Describing Chemical Reactions Chemical Formulae: 1. suffix indicates the # of atoms e.g. H 2 O2 hydrogen 1 oxygen *if no suffix, only one atom is present

Describing Chemical Reactions Chemical Formulae: 1. suffix indicates the # of atoms 2. suffix after brackets multiplies every atom within the brackets e.g. Ca(ClO 3 ) 2

Describing Chemical Reactions Chemical Formulae: 1. suffix indicates the # of atoms 2. suffix after brackets multiplies every atom within the brackets e.g. Ca(ClO 3 ) 2 1 calcium

Describing Chemical Reactions Chemical Formulae: 1. suffix indicates the # of atoms 2. suffix after brackets multiplies every atom within the brackets e.g. Ca(ClO 3 ) 2 1 calcium 2 chlorine

Describing Chemical Reactions Chemical Formulae: 1. suffix indicates the # of atoms 2. suffix after brackets multiplies every atom within the brackets e.g. Ca(ClO 3 ) 2 1 calcium 2 chlorine 6 oxygen

Describing Chemical Reactions Chemical Formulae: 1. suffix indicates the # of atoms 2. suffix after brackets multiplies every atom within the brackets 3. prefix indicates the # of molecules e.g. H 2 O vs 3H 2 O

Describing Chemical Reactions Chemical Formulae: 1. suffix indicates the # of atoms 2. suffix after brackets multiplies every atom within the brackets 3. prefix indicates the # of molecules e.g. H 2 O vs 3H 2 O # hydrogen: 26 # oxygen: 13

Describing Chemical Reactions try these: MoleculeElements in the molecule # atoms of each element MgCl 2 NH 4 OH Al 2 (SO 4 ) 3 3 Ca 2 C 2 (NH 4 ) 3 PO 4

Describing Chemical Reactions try these: MoleculeElements in the molecule # atoms of each element MgCl 2 magnesium1 chlorine2

Describing Chemical Reactions try these: MoleculeElements in the molecule # atoms of each element NH 4 OHnitrogen1 hydrogen5 oxygen1

Describing Chemical Reactions try these: MoleculeElements in the molecule # atoms of each element Al 2 (SO 4 ) 3 aluminum2 sulfur3 oxygen12

Describing Chemical Reactions try these: MoleculeElements in the molecule # atoms of each element 3 Ca 2 Ccalcium6 carbon3

Describing Chemical Reactions try these: MoleculeElements in the molecule # atoms of each element 2 (NH 4 ) 3 PO 4 nitrogen6 hydrogen24 phosphorus2 oxgyen8