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  AdorableMoose4991

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  Secondary I • 3yr.

  Hello, 

  
  

  I know that a doorknob has a bi-directional rotational motion, but I don't know how to draw this type of movement. Can you help me please ?

  Science

  0

  1 answer
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  SkillfulGrasshopper3789

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  Secondary II • 3yr.

  Hello,

  I am having a hard time with the motion transformation mechanisms. Could you explain them to me please?

  Thanks a lot!

  Science

  0

  1 answer
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  SkillfulGrasshopper3789

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  Secondary II • 3yr.

  Hello,

  I had a genetics class today, but I didn't really get it. Can you explain it to me again?

  Thanks a lot!

  Science

  0

  1 answer
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  SkillfulGrasshopper3789

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  Secondary II • 3yr.

  Hello,

  What's the difference between prokaryotic and eukaryotic cells? 

  Thank you

  Science

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  1 answer
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  SkillfulGrasshopper3789

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  Secondary II • 3yr.

  Hi,

  
  

  Why do the leaves change color in the fall? Why does the green disappear?

  Good evening

  Science

  0

  1 answer
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  SkillfulGrasshopper3789

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  Secondary II • 3yr.

  Hello! Can humans and plants do both photosynthesis and cellular respiration?

  Thank you :)

  Science

  0

  1 answer
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  SkillfulGrasshopper3789

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  Secondary II • 3yr.

  Hello,

  I can't seem to understand how energy can manifest naturally. Can you explain to me how it manifests please?

  Thanks a lot!

  Science

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  1 answer
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  SkillfulGrasshopper3789

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  Secondary II • 3yr.

  Hello,

  I can't understand the difference between renewable and non-renewable natural resources. Can you explain it to me please?

  Thanks a lot!

  Science

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  1 answer
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  NaiveAbafar3712

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  Secondary I • 3yr.

  How does temperature vary with the atmosphere’s altitude? Thank you

  Science

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  2 answers
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  NaiveAbafar3712

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  Secondary I • 3yr.

  Can an object guide and link at the same time?

  Science

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  1 answer
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  NaiveAbafar3712

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  Secondary I • 3yr.

  What is the difference between rotational guiding, translational guiding, and helical guiding?

  Science

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  1 answer
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  NaiveAbafar3712

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  Secondary I • 3yr.

  Hello, what is the difference between a direct and indirect link and a rigid and elastic link?

  Science

  0

  1 answer
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  NaiveAbafar3712

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  Secondary I • 3yr.

  What is the difference between twist and tension? Thank you :)

  Science

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  1 answer
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  NaiveAbafar3712

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  Secondary I • 3yr.

  Hi! 

  Can you explain to me what the deformation is, please? 

  Thank you

  Science

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  1 answer
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  NaiveAbafar3712

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  Secondary I • 3yr.

  Hi! I don't fully understand the difference between movement, force, effects, and consequences ... Can you enlighten me, please?

  
  

  Thank you 🙂

  Science

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  1 answer
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  NaiveAbafar3712

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  Secondary I • 3yr.

  Hello, 

  Can you tell me what are the phases of matter present during laboratory distillation?

  Science

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  1 answer
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  NaiveAbafar3712

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  Secondary I • 3yr.

  Hello,

  Can we do a filtration to separate all the heterogeneous mixtures?

  Science

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  1 answer
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  NaiveAbafar3712

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  Secondary I • 3yr.

  Hello, 

  Soon, I'll have an exam on all the labs that we did this year, but I was absent during the lab in which we did decantation. Could you tell me how to proceed?

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  1 answer
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  NaiveAbafar3712

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  Secondary I • 3yr.

  Hello,

  I have to separate mixtures in my laboratory, but I no longer recall techniques. Could you please remind me?

  Thanks a lot!

  Science

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  1 answer
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  NaiveAbafar3712

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  Secondary I • 3yr.

  Hello.

  I learned about separating mixtures methods in class (evaporation, decantation, filtration, distillation, sieving, centrifugation, paper chromatography, and chemical techniques), but I'm not sure that I use the right technique in the right situation. 

  Can you explain to me, please?

  Science

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  1 answer
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  NaiveAbafar3712

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  Secondary I • 3yr.

  How do I find the state of the matter if I have pictures like this without description:

  

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  Ce contenu est protégé par le droit d'auteur. Toute reproduction à l'extérieur des forums Alloprof est interdite et pourra être considérée comme une violation du droit d'auteur.

  

  

  Ce contenu est protégé par le droit d'auteur. Toute reproduction à l'extérieur des forums Alloprof est interdite et pourra être considérée comme une violation du droit d'auteur.

  

  Science

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  1 answer
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  FastFox1311

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  Secondary III • 3yr.

  Hello! In my homework I need to find the molar concentration of 0.874 kg of H3PO4 in 3L of water, how do I find it?

  Science

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  1 answer
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  FastFox1311

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  Secondary III • 3yr.

  Hello! I do not understand the link between solvent, solute and solution.

  Can someone help me please?

  Science

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  1 answer
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  FastFox1311

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  Secondary III • 3yr.

  How can we tell the order in which substances float on top of each other (in what order they overlap)?

  Thanks!

  Science

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  1 answer
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  ZenZombie9054

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  Secondary II • 3yr.

  Hello,

  I can't figure out what chemical changes are and how to recognize them. Could you explain me what they are please?

  Thanks a lot!

  Science

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  1 answer
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  ZenZombie9054

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  Secondary II • 3yr.

  How do you distinguish between physical changes and chemical changes? What is the difference?

  Science

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  1 answer
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  ZenZombie9054

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  Secondary II • 3yr.

  Hello,

  I have a hard time understanding how physical changes work. Can you explain to me how they work please?

  Thanks a lot!

  Science

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  1 answer
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  ZenZombie9054

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  Secondary II • 3yr.

  Hello alloprof

  How can conservation of matter be experimentally verified?

  thank you

  Science

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  1 answer
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  ZenZombie9054

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  Secondary II • 3yr.

  Hello,

  I can't quite understand how the law of conservation of matter works. Can it be applied for both physical and chemical changes?

  Thanks a lot!

  Science

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  1 answer
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  QuietDragon2728

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  Secondary II • 3yr.

  A chemical reaction between gases takes place and their volume suddenly doubles. True or false: matter was created.

  I need help!!

  Science

  0

  1 answer