| Category | Format | Size |
|---|---|---|
| Zhejiang Education Edition Ninth Grade Science Volume 1 | pptx | 6 MB |
"Common Bases" PPT courseware
Description
"Common Bases" PPT courseware
Part One: Understanding Bases
1. Write the chemical formulas of the following bases:
Sodium hydroxide Calcium hydroxide
Copper hydroxide Iron hydroxide
2. What is an alkali?
3. Add litmus to the alkali solution to change color _____;
Add phenolphthalein solution to develop _____ color.
The pH of the solution is _____7.
Common bases PPT, part 2: What are the properties of bases?
1. Functioning with indicators
2. Reaction with acid:
(1) Take a small amount of sodium hydroxide solution in a test tube,
Add 1 drop of phenolphthalein and the solution will appear ______ color.
(2) Add dilute hydrochloric acid dropwise with a dropper until the solution is just right
When it becomes colorless, the pH of the solution______.
(3) Pour the reacted solution into the evaporating dish,
Heating, there is ______ in the evaporating dish.
(4) The chemical reaction equation is:
NaOH + HCl == NaCl + H2O
3. Reaction of alkali with some non-metal oxides:
When carbon dioxide is introduced into lime water, the phenomenon that occurs is ______, and the chemical reaction equation is ____________.
Common alkali PPT, part 3: experiment
1. Read the sodium hydroxide reagent bottle label.
2. Use a medicine spoon to take a small piece of sodium hydroxide solid, place it on a watch glass, and observe its color, state, etc. Observe the piece of sodium hydroxide a few minutes later. What do you notice? ______________
3. Put a small amount of sodium hydroxide into a test tube containing 3 ml of water, shake the test tube, and observe any changes. How does it feel when you touch the wall of a test tube with your hand? ___________________
4. Put a handful of rabbit fur or full plush thread into the test tube, stir with a glass rod and heat and boil for 2-3 minutes. What changes will occur in the test tube? _____________
Common bases PPT, part 4 content: thinking
1. How should laboratory sodium hydroxide be stored? Why?
Laboratory sodium hydroxide solids must be sealed and stored, because when sodium hydroxide is exposed to the air, it not only easily absorbs moisture in the air and deliquesces, but also reacts with carbon dioxide in the air and deteriorates.
2. Sodium hydroxide solid is easily deliquescent. What use do you think it should be used for? And what should you pay attention to when using it?
In laboratories, sodium hydroxide is commonly used as a desiccant due to its easy deliquescing properties. But it cannot dry acidic gases, such as CO2, SO2, H2S, HCl. However, the above gases can be absorbed with sodium hydroxide solution.
Keywords: Zhejiang Education Edition ninth grade science PPT courseware free download, common alkali PPT download, .PPT format;
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"Common Bases" PPT (second lesson):
"Common Bases" PPT courseware Part One: Learning objectives: 1. Know the personality of common bases; 2. Know the uses of common bases and explain related life phenomena. ... ... ... Common alkali PPT, part 2: Personality and use of alkali Hydrogen...
"Common Bases" PPT (first lesson):
"Common Bases" PPT Part One Content: Learning Objectives: 1. Deduce the common properties of bases through the physical and chemical properties of sodium hydroxide and calcium hydroxide. 2. Learn to use the relevant properties of alkali to explain relevant life phenomena. What are the properties of bases? Tip: For a class of objects...
"Several Common Bases" Acids and Bases PPT Courseware 4:
"Several Common Bases" Acids and Bases PPT Courseware 4 Knowledge Review Knowledge Point 1 Physical properties of sodium hydroxide and calcium hydroxide Sodium hydroxide: white solid, ____ dissolves in water and releases a lot of heat. Easily absorbs moisture and is highly corrosive. Calcium hydroxide: white...
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Update Time: 2024-07-11
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