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  • Verified by Alloprof
    NaiveAbafar3712avatar
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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
    1 answer
  • Verified by Alloprof
    NaiveAbafar3712avatar
    Verified by Alloprof
    Secondary I • 3yr.

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

    client (1).jpeg

    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.

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    client (2).jpeg

    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.

    i-icon
    client.jpeg

    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.

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    Science
    1 answer
  • Verified by Alloprof
    FastFox1311avatar
    Verified by Alloprof
    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
    1 answer
  • Verified by Alloprof
    FastFox1311avatar
    Verified by Alloprof
    Secondary III • 3yr.

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

    Can someone help me please?

    Science
    1 answer
  • Verified by Alloprof
    FastFox1311avatar
    Verified by Alloprof
    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
    1 answer
  • Verified by Alloprof
    ZenZombie9054avatar
    Verified by Alloprof
    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
    1 answer
  • Verified by Alloprof
    ZenZombie9054avatar
    Verified by Alloprof
    Secondary II • 3yr.

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

    Science
    1 answer
  • Verified by Alloprof
    ZenZombie9054avatar
    Verified by Alloprof
    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
    1 answer
  • Verified by Alloprof
    ZenZombie9054avatar
    Verified by Alloprof
    Secondary II • 3yr.

    Hello alloprof

    How can conservation of matter be experimentally verified?

    thank you

    Science
    1 answer
  • Verified by Alloprof
    ZenZombie9054avatar
    Verified by Alloprof
    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
    1 answer
  • Verified by Alloprof
    QuietDragon2728avatar
    Verified by Alloprof
    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
    1 answer
  • Verified by Alloprof
    QuietDragon2728avatar
    Verified by Alloprof
    Secondary II • 3yr.

    Hi, I know this is a bit of an easy question, but I'm having a hard time distinguishing between energy and matter.

    Can you help me?

    Science
    1 answer
  • Verified by Alloprof
    QuietDragon2728avatar
    Verified by Alloprof
    Secondary II • 3yr.

    What is the difference between photosynthesis and cellular respiration and how to remember it?

    Science
    1 answer
  • Verified by Alloprof
    QuietDragon2728avatar
    Verified by Alloprof
    Secondary II • 3yr.

    Good afternoon,

    I don’t really understand the difference between gene, chromosome, DNA and genome?

    Can you help me?

    Thank you!

    Science
    1 answer
  • Verified by Alloprof
    QuietDragon2728avatar
    Verified by Alloprof
    Secondary II • 3yr.

    What is the difference between the mechanisms of transformation and transmission of movement? I don’t understand.

    Science
    1 answer
  • Verified by Alloprof
    DeltaPotassium727avatar
    Verified by Alloprof
    Secondary I • 3yr.

    At the molecular level, what explains the phase changes?

    Thanks!

    Science
    1 answer
  • Verified by Alloprof
    DeltaPotassium727avatar
    Verified by Alloprof
    Secondary I • 3yr.

    Hello, can you help me with one of my homework numbers? It says:

    "Determine the phase of the substance with the statements below:

    a) I am an incompressible substance, my particles are ordered, brought together and linked together, and only vibrate.

    B) I am a compressible substance, my particles can vibrate and make rotational and translational movements

    c) I am an incompressible substance, with undefined volume and my particles are disordered and loosely bound together. ”

    Thank you for your help!

    Science
    1 answer
  • Verified by Alloprof
    DeltaPotassium727avatar
    Verified by Alloprof
    Secondary I • 3yr.

    Hello! Let's say I do a pH test with litmus paper and my two papers turned red, what does it mean about my solution?

    Thank you!!!

    Science
    1 answer
  • Verified by Alloprof
    DeltaPotassium727avatar
    Verified by Alloprof
    Secondary I • 3yr.

    Hi! How do we conduct the litmus paper test?

    Science
    1 answer
  • Verified by Alloprof
    DeltaPotassium727avatar
    Verified by Alloprof
    Secondary I • 3yr.

    I don't understand the difference between temperature and heat, can someone help me?

    Science
    1 answer
  • Verified by Alloprof
    AdorableMoose4991avatar
    Verified by Alloprof
    Secondary I • 3yr.

    Why does a hot object change the temperature of a cold object?

    Science
    1 answer
  • Verified by Alloprof
    AdorableMoose4991avatar
    Verified by Alloprof
    Secondary I • 3yr.

    Hello,

    I have a hard time using a thermometer in the laboratory. Could you please explain how to use it?

    Thanks a lot!

    Science
    1 answer
  • Verified by Alloprof
    AdorableMoose4991avatar
    Verified by Alloprof
    Secondary I • 3yr.

    I do not understand the difference between temperature and heat. Could you explain it to me please?

    Science
    1 answer
  • Verified by Alloprof
    QuietDragon2728avatar
    Verified by Alloprof
    Secondary II • 3yr.

    Hello,

    I can't tell the energy source from the energy form. Can you explain to me how it works?

    Thank you for helping me!

    Science
    1 answer
  • Verified by Alloprof
    AdorableMoose4991avatar
    Verified by Alloprof
    Secondary I • 3yr.

    Hi, I am having trouble reading a graduated cylinder. Could you help me?

    Science
    1 answer
  • Verified by Alloprof
    AdorableMoose4991avatar
    Verified by Alloprof
    Secondary I • 3yr.

    Hi,

    How do you convert between units of volume (cubic meter, cubic millimeter, cubic decimeter, cubic centimeter, etc.)?

    I do not understand!?! 

    Thank you

    Science
    1 answer
  • Verified by Alloprof
    AdorableMoose4991avatar
    Verified by Alloprof
    Secondary I • 3yr.

    Hello,

    I have to measure the volume of a solid in my lab, but I don't know how. Could you explain the techniques to me please?

    Thanks a lot!

    Science
    1 answer
  • Verified by Alloprof
    AdorableMoose4991avatar
    Verified by Alloprof
    Secondary I • 3yr.

    Hi, how do you go from mL to cubic meters (m^3)? Thanks in advance!!

    Science
    1 answer
  • Verified by Alloprof
    LionSolidaire8599avatar
    Verified by Alloprof
    Secondary I • 3yr.

    Hello,

    Could you explain to me how volume works? I don't really understand what it is.

    Thanks a lot!

    Science
    1 answer
  • Verified by Alloprof
    LionSolidaire8599avatar
    Verified by Alloprof
    Secondary I • 3yr.

    Hello, 

    My teacher told us that our weight is not the same on Earth and on the Moon, I don't understand why, can you help me please?

    Science
    1 answer
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