Monday, May 2 nd : “A” Day Tuesday, May 3 rd : “B” Day Agenda  Check lab write-ups  Pre-lab Discussion  Lab: “Percent Composition of Hydrates” Lab.

Slides:

Advertisements

Similar presentations

Hydrates (11.5) Hydrate- compound with a specific amount of water molecules bound to it.

Advertisements

1. The bond in fluorine has a length of 133pm. a. Draw the Lewis Structure. b. Convert to meters. c. Convert to nm. d. What is the shape and bond angle?

Monday, May 16 th : “A” Day Tuesday, May 17 th : “B” Day Agenda  Chapter 7 Review – go over  Chapter 7 Jeopardy Review  Homework: Chapter 7 Crossword.

Empirical Formula of a Hydrate In addition to this presentation, before coming to lab or attempting the prelab quiz you must also:  Read the following.

Lab # 2 The Formula Of Hydrates. Hydrates Hydrates are ionic compounds that have a specific number of water molecules attached to them. Examples: Calcium.

Determination of a Chemical Formula

It’s just like finding out your test score!!! 97 correct out of 100 questions = 97 x 100 = 97% 100 Total of “something” x 100 = % TOTAL.

Monday, Dec. 9 th : “A” Day Tuesday, Dec. 10 th : “B” Day Agenda  Homework questions/Collect  Sec. 4.3 quiz: “Trends in the Periodic Table”  Check.

Agenda: Feb 25 th Monday Turn in Entry task sheets (If you were gone Friday) Pick up/Fill out/Turn in “I can” Sign up for a clicker.

Mass Relationships in Chemical Reactions Chapter 3.

ChemistryName________________ Experiment # _____Section_____Date_____ Percent of Water in Copper II Name(s) of Lab Partner(s) Sulfate Pentahydrate.

Wednesday, May 4 th : “A” Day Thursday, May 5 th : “B” Day Agenda  Lab Calculations: “Percent Composition of Hydrates”  Collect Lab  Movie: “Strong.

Vocabulary Hydrate - chemically, a salt with water molecule(s) attached MN. xH2O e.g. CaSO4 . ½ H2O Anhydrous - without water MN. xH2O.

Copyright Sautter 2003 HOW ARE THE CHEMICAL FORMULAS FOR COMPOUNDS DETERMINED? THEY CONTAIN WATER !! WE ARE GOING TO CARRY OUT AN EXPERIMENT TO FIND.

Topic: Percentage Composition Do Now:. Percent Composition use chemical formula & assume 1 mole use chemical formula & assume 1 mole Calculate formula.

Bring your calculators to class. Remember the mole? (not just a furry animal that digs holes in the yard.) unit used by chemist to measure things. 1 mole.

PROPERTIES ASSOCIATED WITH WATER

 What is the molar mass of water?  What % of the mass comes from hydrogen?  What % of the mass comes from oxygen?

Experiment 6 hydrate Operation of bunsen burner and crucible heating When ready, attach the bunsen burner to the gas jet(blue cap). Turn the burner tube.

Mathematics of Chemistry The Mole. Mole = a specific Quantity like 1 dozen = L of any gas x1023 molecules 3. GFM gram formula mass H.

Topic 4.  Reactants chemically change into products  must be balanced  use symbols to indicate states  on AP exam, all equations are written as net.

Simplest Formula for a Compound Experiment 9

Mass Relationships in Chemical Reactions Chapter 3.

Section 10-1 Counting Particles Chemists need a convenient method for accurately counting the number of atoms, molecules, or formula units of a substance.

CHEMISTRY Matter and Change

Percentage Composition of Hydrates Purpose: Determine the percent of water in a hydrate. Hydrates are ionic compounds that have a definite amount of water.

Sec. 10.5: The Formula for a Hydrate

Oxford Area High School Science Department

Hydrates Water molecules can adhere to ions as the solid forms The water becomes trapped and is part of the crystal Opals and other gems are common hydrates.

Monday, May 6 th : “A” Day Tuesday, May 7 th : “B” Day Agenda  Homework Questions/Collect: Pg. 248: #1-7  Sec. 7.3 quiz  Lab write-up: “Quantitative.

Pre-Lab Hydrated Compounds. Answer the following. Where appropriate answer in complete sentences. If a calculation is required show all your work. 1.

Tuesday, April 26 th : “A” Day Friday, April 29 th : “B” Day Agenda  Section 7.3 Work Day! Concept Review Quiz  Lab Write-Up: “Percent Composition of.

Hydrates (11.5) Hydrate- compound with a specific amount of water molecules bound to it.

Determining the Percent of Water in a Hydrated Salt Questions and Calculations Help.

Hydrates Hydrates are compounds that have a specific number of water molecules attached to them. An anhydrous compound is one that has no water A dehydrated.

Using chemical formulas. Formula Mass and Molar Mass  formula mass - mass in grams (amu) of all of the atoms of ea element in a compound  add up all.

The Formula for a Hydrate Objectives: 6.0 Solve stoichiometric problems involving relationships among the number of particles, moles, and masses of reactants.

CHEMICAL COMPOUNDS AND THE MOLE Chapter 7. Formula Mass  Mass of H 2 O?  Formula Mass: mass of molecule, formula unit, or ion is sum of masses of all.

Two cartoons in honor of my husband’s birthday….

Water of crystallisation

Lecture 59 Formulas of Hydrates Ozgur Unal 1.  What is the difference between the two fruits? 2  Can you find how much water was removed from the fruit?

Warmup 11/19/15 Tell me a story about something that can soak up water Objective Tonight’s Homework To learn how chemicals can absorb and hold water pp.

Composition Stoichiometry Chapter 7. Percent Composition by Mass What is a percent? A percent is part of a whole quantity. When using percents, we assume.

Empirical and Molecular Formulas. Chemistry Joke Q: What happens to rock that has been heated to 6.02 X degrees? A: It becomes molten!

Aim: How to calculate Percent Composition  DO NOW: 1. What is the number of moles of potassium chloride present in 148 g? 2. What is the molar mass of.

CHEMICAL QUANTITIES Composition Stoichiometry Calculating Molar Mass Avogadro’s Number and the Mole Percentage Composition and Empirical Formulas Molecular.

Empirical Formula and Molecular Formula. Empirical Formula  Empirical formula is the simplest whole number ratio of atoms in a formula  Empirical information.

Hydrates Percent Composition Empirical Formula Naming Chapter 8.

Chapter Menu The Mole Section 10.1Section 10.1Measuring Matter Section 10.2Section 10.2 Mass and the Mole Section 10.3Section 10.3 Moles of Compounds.

PG. 77 Hydrates. Hydrates are compounds that have water molecules attached to them. When determining the molar mass, you must account for the water. Ex.

THE MOLE. STANDARDS Use the mole concept to determine the number of particles and mass in a chemical compound. (includes gram to mole to atom conversions)

Chapter Menu The Mole Section 10.1Section 10.1Measuring Matter Section 10.2Section 10.2 Mass and the Mole Section 10.3Section 10.3 Moles of Compounds.

Exp 5 – Percent Water in a Hydrated Salt

Unit 1 Lecture 7: Percent Composition, Empirical and Molecular Formulas The student can justify the observation that the ratio of the masses of the constituent.

PERCENT OF WATER IN COPPER II SULFATE PENTAHYDRATE

Composition Stoichiometry

DO NOW Turn in Molar Quantities lab. Pick up Notes

Percent Composition, Empirical Formulas, and Molecular Formulas

Section 3.2 Stoichiometry and Compound Formulas

Bell Work 1 / Mole Map 1. Draw the Mole Map and include the relationships that exist between each section.

PROPERTIES ASSOCIATED WITH WATER

Hydrates Unit 6 Lesson 3.

BR 1/17 A hydrate is a compound with water added. When naming them we use the prefixes we used for covalent compounds. For example: CuSO4 · 5H2O is.

Chapter 10: The Mole.

Chemical Composition Mole (mol) – The number equal to the number of carbon atoms in grams of carbon. Avogadro’s number – The number of atoms in exactly.

Empirical and Molecular Formulas

Using Chemical Formulas

Hydrates Unit 6 Lesson 3.

Chemical Formulas Tell type & number atoms in compound

Presentation transcript:

Monday, May 2 nd : “A” Day Tuesday, May 3 rd : “B” Day Agenda  Check lab write-ups  Pre-lab Discussion  Lab: “Percent Composition of Hydrates” Lab will be due next time… Looking Ahead Next time: Lab Calculations/Movie

Lab Write-Up “Percent Composition of Hydrates”  Many ionic compounds include individual water molecules as part of their crystalline structure.  If heated, the water molecules are driven off, leaving the pure anhydrous form of the compound.  The number of moles of water driven off per mole of anhydrous compound should be a simple whole-number ratio.  This information can be used to determine the formula of the hydrate.

Lab Write-Up “Percent Composition of Hydrates”  In this lab, you will determine the following: 1.The empirical formula of the hydrate, including its water of crystallization. 2.If the compound is useful as an indicator when it changes from the hydrated to the anhydrous form. 3.The mass of water absorbed by 25g of the anhydrous compound.

Lab: “Percent Composition of Hydrates” 1. What chemical is being used in this lab? Copper (II) Sulfate, CuSO 4 Hydrated crystals 2.How much of it do you use? 5 grams

Lab: “Percent Composition of Hydrates” 3.What is a hydrate? A compound that has individual water molecules as part of its crystalline structure. 4.Why is the copper sulfate heated? To drive off the water.

Lab: “Percent Composition of Hydrates” 5.Why do you heat the copper sulfate more than once? To make sure that all of the water is gone. 6.What does anhydrous mean? “With all water removed”, especially water of crystallization.

Lab: “Percent Composition of Hydrates” 7. What do you need to do with the crucible before placing it on the balance? Cool it in the desiccator. 8.Why is a desiccator used to cool the sample? The hot sample will absorb water from the air if not placed in the desiccator.

Safety Guidelines 1.We are using bunsen burners: your hair must be tied back! 2.Be careful with the crucible/cover. They are extremely hot and tipsy. If you drop it…DO NOT try to catch it…let it fall. It’s easier to clean up a spill than to treat a burn or a cut. 3.Be sure to cool the crucible/cover before placing it on the balance…hot crucibles WILL damage the balances!

Lab: “Percent Composition of Hydrates”  Make sure your data has the correct units.  Using complete sentences, complete the “observations” section on page 79 and answer Analysis questions #1 and #2 on page 80.  We’ll do the rest of the calculations together next time. Be careful and have fun!

Lab Partners 2B  Brandon, Colin  Lexi, Calvin  Alisha, Alyssa  Stephanie, Casey  Andrew, Aaron  Tabitha, Hannah  Taylor, Avery  Meghan, Kate  Mark, Erin  Rowdy, Janae  Hallah, Brock  Sean, Bill

Lab Partners 3B  Cassie W., Alyssa  Reid, Kyle  Maddi, Olivia  Terry, Madi  Billie, Devon  Mirissa, Victoria  Alex F., Scott  Kelcie, Sam  Savannah, Greg  Brian, Alex V.  Caitlynn, Cassie M.

Lab Partners 4B  Michaela, Olivia  Morgan A., Travis  Bobby, Connor  Elyce, DJ  Nolan, Nathan  Maddie, Maui  Kaitlyn, Hailey  Jenelle, Danial  Morgan D., Jessica  Sherri, Julia  Hannah, Jacob  Erika, Samantha