中学化学实验室-中考必备 1.17

Shanghai Niwei Digital Technology Co., Ltd. ❘ Freeware ❘
iOS
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Based on the chemistry practical experiments for junior high school students announced by the Ministry of Education:
<ol>
<li>Assembling apparatus for producing oxygen using potassium permanganate in the laboratory</li>
<li>Experiment of producing oxygen using hydrogen peroxide in the laboratory</li>
<li>Exploration of solute in the waste solution of carbon dioxide produced in the laboratory</li>
<li>Investigation of conditions for substance combustion</li>
<li>Investigation of the metallic activity of zinc, copper, and magnesium</li>
<li>Assembling a filtration device and filtering crude saltwater</li>
<li>Heating and evaporating a salt solution</li>
<li>Weighing 6.5 grams of sodium chloride using a tray balance</li>
<li>Preparation of a sodium chloride solution with a specific mass fraction</li>
<li>Differentiation of hydrochloric acid, sodium hydroxide solution, and distilled water</li>
<li>Determining the acidity or alkalinity of a solution using pH paper</li>
<li>Reaction between acidic copper sulfate solution and sodium hydroxide solution</li>
<li>Neutralizing hydrochloric acid with sodium hydroxide solution</li>
<li>Removing rust with dilute hydrochloric acid</li>
<li>Distinguishing between sodium hydroxide and calcium hydroxide solutions</li>
<li>Laboratory production and collection of carbon dioxide</li>
<li>Investigation of the reaction between carbon dioxide and water</li>
<li>Exploration of the metamorphosis of calcium hydroxide</li>
<li>Investigation of reactions between soluble bases and certain salts</li>
<li>Differentiation between sodium carbonate solution with added sodium sulfate</li>
</ol>

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<ol>
<li>Subscription: VIP subscription includes monthly (1 month) and annual (12 months) options.</li>
<li>Pricing: Monthly VIP subscription costs 15 CNY/month, while the annual subscription costs 38 CNY/year.</li>
<li>Payment: After confirming a purchase, payment will be charged to your iTunes account.</li>
<li>Auto-Renewal: Your Apple iTunes account will be charged 24 hours before expiration, extending the subscription for another period upon successful payment.</li>
<li>Cancellation: You can manage auto-renewal subscriptions by going to "Settings" on your Apple device, accessing "iTunes & App Store," clicking on your "Apple ID," selecting "View Apple ID," entering "Account Settings," clicking on "Subscriptions," and managing auto-renewal preferences. To cancel, turn off auto-renewal at least 24 hours before the end of each billing cycle. No charges will be made within 24 hours of expiration.</li>
<li>If you reinstall the app during a subscription period, click on the "Retrieve" button to restore your VIP privileges.</li>

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Website: <a href="https://www.niiway.com">https://www.niiway.com</a>

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