Group 2 Elements & Compounds

Slides:

Advertisements

Similar presentations

Balancing Chemical Equations

Advertisements

UNIT 5 Aqueous Reactions and Solution Stoichiometry Acid-Base Neutralization.

Precipitate Reactions L.O. I can state which are spectator ions in a precipitation reaction. I can make a clean dry precipitate and write the ionic equation.

Notes on Total and Net Ionic Equations. Ionic Compounds (Metal and Nonmetal) (Cation and Anion) If soluble these compounds will DISSOLVE and DISSOCIATE.

Topic 9 ReactionsofAcids. Acids and Alkalis When an acid reacts with an alkali the general equation is: Acid + Alkali  Salt + Water.

CH.3 Balancing Reactions Reaction Types

Chemical Equations Preparation for College Chemistry

Calderglen High School

CHEMISTRY DEPARTMENT WAID ACADEMY Standard Grade Topic 9.

Acids, Alkalis and Indicators Prepared by Mdm RY Leow The Chinese High School.

METAL OXIDES & HYDROXIDES.  These are mostly insoluble (can’t be dissolved in water) EXCEPT! -Those containing Sodium (Na+) -Those containing Potassium.

Making Salts Soluble salt Insoluble salt Acid + excess insoluble solid

C4 Lesson 16 – Testing Water. After studying this topic, you should be able to: recall the tests for sulfate ions and halide ions in water write word.

Ions In Solution.

Predicting Products of Chemical Reactions Honors Chemistry Ch 10 (Still)

MAKING SALTS 27/08/2015. Making Soluble Salts There are 3 types of reaction that can be used to make soluble salts. All 3 involve: An Acid A metal or.

Acids and Alkalis Learning Objectives To know that solutions can be sorted by whether they are: acid, alkali or neutral. To understand that an alkali reacts.

12.6 – How can we use ions in solutions?

Acids & Bases  What is an acid? (It is defined by its behavior in water.)  What is a base?  What does neutralization mean?  What are the products of.

C2- Chemistry Analysing substances, making salts, acids and bases

CHAPTER 8 REACTIONS IN AQUEOUS SOLUTIONS. PREDICTING PRODUCTS WITH AQUEOUS REACTANTS Driving Force for reactants to form certain products Most common:formation.

Calculating Yield L.O: To be able to calculate yield for chemical reactions.

Salts By Amy Badger.

GROUP II Alkaline earths CONTENTS ©HOPTON General properties

Trends in chemical properties of group 2. Reactivity Group 2 are less reactive than group 1. Na vigorously reacts with water. But Ca reacts very slowly.

Double Displacement Reactions. Reactants: Zn + I 2 Product: Zn I 2.

CCBAB Compound ABCompound CD AD Compound ADCompound CB D ++ Magnesium Chloride MgCl 2 Calcium Hydroxide Ca(OH) 2 Magnesium Hydroxide Mg(OH) 2 Calcium Chloride.

Chemical Changes – Part Deux

Reactions in Aqueous Solutions. 7.1 Predicting Whether a Reaction Will Occur? Driving Forces Formation of solid Formation of water Transfer of electrons.

Revision Quiz Acids 1 1.What is the pH scale? 2.What numbers on the pH scale show an acid? 3.What is an indicator? 4.What number is neutral? 5.What colour.

Ionic equations A chemical equation shows the number of atoms and molecules of the reactants and products. Also shows physical state of reactants and products.

Unit 7 Reactions in Solution Chem II Objectives  Describe the driving force for a chemical reaction.  Use generalizations to predict the products of.

Acids and Alkalis Year 11. CONTENTS Acidity and alkalinity Indicators pH Acids General methods for making salts Making salts from metal oxides Making.

Colour changes for simple indicators IndicatorColour in acidColour in alkali litmusredblue methyl orangeredyellow phenolphthaleincolourlessred.

SALTS When you hear the word salt, what do you think of?

Reaction Predictions Precipitation Reactions. Precipitation Prediction 1)Write the reactants in ionic from o breakdown into ionic form if compounds are.

Neutralization and Conductivity

Aqueous Solutions.

Unit 7 Reactions in Solution Upon completion of this unit, you should be able to do the following: Describe the driving forces for a chemical reaction.

3.2.2 Group 2, the Alkaline Earth Metals

Double Displacement Complete and Ionic Equations.

GROUP 2 (ALKALI EARTH METALS) REACTIONS. How would you represent the first, second and third ionisation energies of a general metal? What does the first.

Properties of Group 2 The alkaline earth metals. Electronic configurations All the alkaline earth metals have two electrons in their outer shell; Be =

Chemical Reactions GPS 10. Indicators of a chemical reaction: 1.Precipitation of a Solid 2.A distinct color change 3.Formation of a gas (bubbling or fizzing)

Chemical Changes and Equations An Investigation of Four Types of Chemical Reactions.

C2 7.3 Making salts from solutions (aq) (l) The indicator shows when the acid and alkali have completely reacted …... L/O How we * make salts from acids.

Atoms of different elements combine to form compounds by the formation of new chemical bonds Describe how the transfer of electrons produces cations and.

Starter Quiz What ions are produced by acids and alkalis?

Chemical Changes and Structure

Universal Indicator can be used to find the pH of a solution

Universal Indicator can be used to find the pH of a solution

Acids and Alkalis Grade 10.

Mini test – write the formulae for

Sulphate Anion Tests.

Learning objective: WALT:

Chemsheets AS006 (Electron arrangement)

12.6 – How can we use ions in solutions?

Qualitative Analysis Reactions that produce an INSOLUBLE SALT.

8.3 Preparation of salts Demonstrate knowledge and understanding of preparation, separation and purification of salts as examples of some of the techniques.

Chapter 20 Predicting the Products of a Chemical Reaction

Writing Equations Saturday, 24 November 2018.

Chemsheets AS006 (Electron arrangement)

MAKING SALTS 21/06/2019.

Presentation transcript:

Group 2 Elements & Compounds Trends in Chemical Properties

Reactivity increases down the group Reaction with Water Be Does not react Mg Slowly with cold water Reacts readily with steam Mg(s) + H2O(g) → MgO(S) + H2(g) Ca All react with cold water Increasing reactivity Ca(s) + 2H2O(l) → Ca(OH)2(aq) + H2(g) Sr Sr(s) + 2H2O(l) → Sr(OH)2(aq) + H2(g) Ba Ba(s) + 2H2O(l) → Ba(OH)2(aq) + H2(g) Reactivity increases down the group No of energy levels increases down group Outer “s” e- further from nucleus More easily lost

Metal Hydroxides Mg(OH)2 Sparingly Soluble (only a v small amount dissolves) Milk of Magnesia Ca(OH)2 Slightly soluble Limewater Sr(OH)2 Soluble Ba(OH)2 Milk of Magnesia suspension of Mg(OH)2 in water taken to neutralise acid indigestion . Very weak alkali Excess doesn’t disturb digestion (sparingly soluble)

Solubility increases down the group Metal Hydroxides Mg(OH)2 Sparingly Soluble (only a v small amount dissolves) Solubility increases down the group Ca(OH)2 Slightly soluble Sr(OH)2 Soluble Ba(OH)2 MgCl2(aq) + 2NaOH(aq) → Mg(OH)2(s) + 2NaCl(aq) white precipitate BaCl2(aq) + 2NaOH(aq) → Ba(OH)2(aq) + 2NaCl(aq) no precipitate

Metal Sulphates MgSO4 Very Soluble Epsom Salts (laxative) CaSO4 Sparingly soluble SrSO4 Insoluble BaSO4 Very Insoluble Barium Meal Barium Sulphate – extremely insoluble in water BaSO4 is opaque to X rays Suspension of BaSO4 given to patients with digestive problems X-ray will highlight problems

Solubility increases up the group Metal Sulphates MgSO4 Very Soluble Solubility increases up the group CaSO4 Sparingly soluble SrSO4 Insoluble BaSO4 Very Insoluble MgCl2 (aq) + Na2SO4(aq) → MgSO4(aq) + 2NaCl(aq) no precipitate BaCl2(aq) + 2NaSO4(aq) → BaSO4(s) + 2NaCl(aq) white precipitate

Test for Sulphate ions Add dilute nitric acid (this prevents the formation of unwanted precipitates) Add few drops of Barium nitrate Or Add dilute hydrochloric acid Add few drops of Barium chloride

Test for Sulphate ions BaCl2(aq) + Na2SO4(aq) → BaSO4(s) + 2NaCl(aq) white precipitate If sulphate ions are present in solution a white ppt of barium sulphate will form. Ba(NO3)2(aq) + 2KSO4(aq) → BaSO4(s) + 2KNO3(aq)