Valence & Formula Practice2026 is an education app developed by Nanjing Yunxiaochuang Technology Co., Ltd.
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App Information
Valence & Formula Practice2026 costs $0.29. The app size is 1.57 MB. The latest version available is 1.1. The last update was on August 4, 2026.
Technical Requirements
The app has a content rating of Everyone. The app has been available on the App Store since June 2026.
Valence & Formula Practice2026 is made and published by
Nanjing Yunxiaochuang Technology Co., Ltd.
AppBrain is an independent app data site and isn't affiliated with Nanjing Yunxiaochuang Technology Co., Ltd.
The app name, icon, screenshots and description belong to Nanjing Yunxiaochuang Technology Co., Ltd and are shown as published on the App Store.
Description by Nanjing Yunxiaochuang Technology Co., Ltd(from the App Store)
Valence & Formula Practice is an offline study tool for junior chemistry learners, useful for previewing lessons, correcting homework, and preparing for exams.
The app focuses on the common challenge of writing chemical formulas. It provides quick lookup for common element valences, polyatomic ion cards, crisscross method practice, true or false checks, and mistake review. All content stays on the device. No login, no internet connection, and no personal data collection are required.
Key features: 1. Quick lookup for common element and ion group valences by name, symbol, and category. 2. Chemical formula writing practice covering oxides, acids, bases, salts, and other common question types. 3. Crisscross method step hints to explain subscript reduction and positive-negative valence balancing. 4. Mistake notebook and mastery statistics that track weak elements and error-prone topics. 5. Offline question bank and focused practice templates for daily drills and exam review.
Each subscription will automatically renew 3 days before the expiration date for
the same time period. Subscriptions can be cancelled at any time before the renewal.
