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  NaiveAbafar3712

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  Secondary I • 3yr.

  What is the difference between a helical motion and a rotational motion?

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  1 answer
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  NaiveAbafar3712

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  Secondary I • 3yr.

  How do you choose the correct mixture separation technique?

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  1 answer
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  QuietDragon2728

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  Secondary II • 3yr.

  Hello,

  I don't understand the difference between each of these terms: atom, molecule, element and compound.

  Can you help me ?

  Thanks

  Science

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  1 answer
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  QuietDragon2728

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  Secondary II • 3yr.

  Why do chemical changes in chemistry respect Lavoisier's law (nothing is lost, nothing is created, everything is transformed)? It seems to me that we destroy something in order to create when there is a chemical change...

  Science

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  1 answer
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  QuietDragon2728

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  Secondary II • 3yr.

  What does the phrase "nothing is created, nothing is lost, everything is transformed" mean ?

  thank you!

  Science

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  1 answer
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  PeacefulEarth1054

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  Secondary I • 3yr.

  What is the hydrosphere and what is it useful for? Thank you!

  Science

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  1 answer
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  PingouinChouette2685

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  Secondary III • 3yr.

  Hi,

  I'd also like to know what is a constraint?

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  PingouinChouette2685

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  Secondary III • 3yr.

  What are the 4 characteristics of links?

  Thanks for your help :)

  Science

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  1 answer
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  DeltaPotassium727

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  Secondary I • 3yr.

  Hello! I was wondering if all gases were invisible? Thanks!

  Science

  1

  1 answer
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  AdorableMoose4991

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  Secondary I • 3yr.

  Hi! How do we do the litmus paper test? Thanks a lot!

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  AdorableMoose4991

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  Secondary I • 3yr.

  Hi,

  My teacher is asking me to measure the volume of a rock. How do I do that? The sides are not straight ... I cannot measure them!

  Science

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  KindTyrannosaurus332

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  Secondary II • 3yr.

  Hello again! :)

  Why is water not an element but a compound? In fact, I don't quite understand the difference. Do you have a tip?

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  1 answer
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  AdorableMoose4991

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  Secondary I • 3yr.

  How do you calibrate a flail scale? Anyway, I don't understand why this is important.

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  1 answer