"Ion Reaction" PPT

Description

"Ion Reaction" PPT

Part One: Goals and Competencies:

1. Understand ionic reactions and the conditions under which they occur through experimental facts. (Scientific inquiry and innovation consciousness)

2. Be able to write and judge ionic equations correctly and understand the meaning of ionic equations. (Macroscopic identification and microscopic analysis)

3. Based on the conditions under which ion reactions occur, determine whether common ions can coexist. (Changing concepts)

Ion reaction PPT, part 2: independent preview and exploration of new knowledge

1. Ionic reactions and ionic equations

1. ionic reaction

(1) Experimental study on the reaction of electrolytes in solutions

(2) Ionic reaction: The reaction of electrolytes in solution is essentially a reaction between ions.

2. Ionic reaction equation

(1) Ionic equation: Use the __________ that actually participates in the reaction to express the formula of the reaction.

(2) Steps for writing ionic equations (taking the reaction between Na2SO4 solution and BaCl2 solution as an example)

①Write: chemical equation (must be based on experimental facts).

Na2SO4＋BaCl2===____________________

②Disassemble: Write substances that are easily soluble in water and easily ionized (such as ____, ____ and most _______ salts) into ionic form.

2Na＋＋SO2－4＋Ba2＋＋2Cl－===BaSO4↓＋2Na＋＋2Cl－

③Delete: Delete the ions that do not participate in the reaction on both sides of the equation.

SO2－4＋Ba2+===BaSO4↓

④Check: Check whether the number of atoms and the total number of charges of each element on both sides of the equation are equal, reaction conditions, precipitation symbols, gas symbols, etc.

3. What does the ionic equation mean?

2. Conditions for metathesis ion reaction to occur

1. Reaction conditions

2. Ion coexistence

(1) Whether several ions can coexist in large quantities in a solution depends on whether reactions occur between them.

(2) If there is no reaction between ions in the solution, they can coexist in large quantities; otherwise, they cannot coexist in large quantities.

Ion reaction PPT, the third part: core breakthroughs and difficult problems

Writing and correctness of ionic equations

1. Things to note when writing ionic equations

(1) There are three ways to deal with slightly soluble matter.

① Write the chemical formula when it appears in the product.

②Write the ion symbol when the reactant is in solution.

③Write the chemical formula when the reactants are in turbid liquid or solid state.

(2) The ammonium salt in the solution reacts with the alkali to release NH3 when heated. If not heated, it writes NH3·H2O.

(3) Write the ion symbol in the ionic equation for concentrated hydrochloric acid and concentrated nitric acid, and keep the chemical formula for concentrated sulfuric acid.

(4) The acidic acid ions of HCO-3, HS-, HSO-3 and other weak acids cannot be written separately.

(5) Elemental substances and oxides retain chemical formulas.

2. Determining whether the ionic equation is correct or incorrect

(1) Check whether it is consistent with objective facts.

(2) Check whether the split is correct.

(3) Check whether it is consistent with atomic conservation and charge conservation.

(4) Check whether there is any missing ion reaction.

Ion reaction PPT, the fourth part: meeting standards in class and improving quality

1. Which of the following ionic reactions cannot occur ()

A. KCl＋NaOH===NaCl＋KOH

B． AgNO3＋NaCl===AgCl↓＋NaNO3

C． Na2CO3＋Ca(OH)2===CaCO3↓＋2NaOH

D． CaCO3＋H2O＋CO2===Ca(HCO3)2

A: Since KCl solution and NaOH solution exchange components with each other, no water, gas, or precipitation is generated, and the substances cannot undergo chemical reactions. ]

2. Among the reactions between the following groups of substances, the ones that are not ionic reactions are ()

A. Reaction of Zn and H2SO4 (dilute)

B． Reaction of NaCl solution and AgNO3 solution

C． C and O2 reaction

D． Reaction of Fe and CuSO4 solution

C: The reactions in options A, B, and D are all reactions carried out in solution, and each group has ions removed to participate in the reaction, so they are all ionic reactions; the reaction between C and O2 regardless of the product Whether it is CO or CO2, neither reaction occurs in solution, so it is not an ionic reaction. ]

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Update Time: 2024-11-02

This template belongs to Chemistry courseware People's Education Press High School Chemistry Compulsory Course I industry PPT template

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