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Adding rational numbers: Exercises
BookWidgets exercises on adding and subtracting rational numbers in fraction form and as a decimal number.
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Setting up reaction equations: Guided practice
Do you have difficulties drawing up chemical reaction equations? These guided exercises will help you arrive at the correct reaction equation quickly and easily.
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Drawing up a reaction equation: Tips
Difficulties with formulating reaction equations? These tips will help you or your students to prepare reaction equations easily and correctly. A separate video has been developed for the exercises.
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Reaction patterns between inorganic substance classes: In-depth
Here you will get an overview of the different reactions that can take place between the inorganic substance classes. In this lesson we will cover the extended reactions, so it is recommended that you first review reaction patterns between inorganic …
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Reaction patterns between inorganic substance classes
Reaction patterns or coherence between the inorganic substance classes: an overview of the different reactions that can take place between the inorganic substance classes. In this lesson we will discuss the five basic reactions:
- metal + oxygen gas …
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Precipitation reactions: Theory and detailed exercises
A video about the basic chemical principles behind precipitation reactions and explanations of exercises with precipitation reactions.
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Tim Cook, Apple CEO: Documentary
The video is about Apple, but most importantly; it's about Tim Cook. His journey and how he took a legacy to greater heights than anyone thought possible. Apple would completely and utterly not exist without Steve Jobs; and while his gifts to the …
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Astronomy: Speed of Light
This digital exercise will help you learn more about astronomy. While completing the multiple choice questions and fill-in exercises you will learn more about:
- measure the speed of light;
- Lorentz transformation;
- arcsecond;
- light-year sunrise; …
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Astronomy: Calendar
This digital exercise will help you learn more about astronomy. While completing the multiple choice questions and fill-in exercises you will learn more about:
- calculation day of the week;
- modular arithmetic;
- perpetual calendar;
- week number; …
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Similar Triangles: Exercises
These BookWidgets cover exercises on similar figures, the similarity factor and calculating a missing side.
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Astronomy: Theory of Relativity
This digital exercise will help you learn more about astronomy. While completing the multiple choice questions and fill-in exercises you will learn more about:
- general relativity;
- special relativity.
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Astronomy: Concepts 4
This digital exercise will help you learn more about astronomy. While completing the multiple choice questions and fill-in exercises you will learn more about:
- ebb,
- emission line,
- photosphere,
- epicycles,
- gray nights,
- white nights,
- GZK limit,
- halo.
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