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Discussion List

Verified by AlloprofSecondary IV • 1yr.
Hi! What is a lubricant used for in a mechanism? Can you give me an example? Thank youuu

Verified by AlloprofGrade 2 • 1yr.
Hello, I have difficulty with the units in cm, dm and m. Do you have any tips for not mixing them up please

Verified by AlloprofGrade 2 • 1yr.
Hello, I have difficulty passing the measure exercises in class. Sometimes we have measure time (we have to say about how long some activities take) and sometimes we have to measure objects. I would like to have some tips to improve myself please !!

Verified by AlloprofGrade 2 • 1yr.
Hi ! In school I have to compare solids but I don’t understand how to compare them with faces and apex. Thanks for your help.

Verified by AlloprofGrade 2 • 1yr.
Hello, we are working on the comparison of figures at the moment but I am having difficulty understanding how to do this properly. Can you help me please?

Verified by AlloprofGrade 2 • 1yr.
Hello, I have difficulty distinguishing between diamonds and squares. I need to know all of the following shapes: square, diamond, rectangle, circle and triangle. It's difficult ... Thank you !!

Verified by AlloprofGrade 2 • 1yr.
Hello, I do not understand what the equality between two numbers is. Can you explain this to me please? Thank you.

Verified by AlloprofGrade 2 • 1yr.
Hello, I don't understand this math problem. My teacher says 5 = 1 + 4, but they are not the same numbers ... Can you help me please?

Verified by AlloprofGrade 2 • 1yr.
Hello,
I am having difficulty counting numbers. I have to do this in several ways, but I don't understand how.
One last question, how do I write the numbers? I find it difficult. Thanks a lot!!

Verified by AlloprofGrade 2 • 1yr.
Hello, I would like to improve my counting because this is what we are seeing right now, but my teacher has no exercises for me. Do you have any ideas for how I can practice myself please? Thank you!!

Verified by AlloprofSecondary IV • 1yr.
How do you distinguish between metals, nonmetals and metalloids in the periodic table?

Verified by AlloprofSecondary IV • 1yr.
Hi!
I have an exercise that asks me to determine the mass of sodium hydroxide (NaOH) in a basic solution by titrating it with a 1.8 mol / L acidic solution. The titration shows a neutralization volume of 30 mL for the acid and an initial volume of 20 mL for the base. I am not sure how to find the mass.

Verified by AlloprofSecondary IV • 1yr.
Hi!
I'm not sure if I understand how a titration can help us to know the concentration of a solution ... Can someone explain it to me please?
Thank you very much in advance!

Verified by AlloprofSecondary IV • 1yr.
Hi! I'm not sure I understand how pH works.
Is the higher, the more acidic?
And if for example I have a solution with a pH of 4 and another with a pH of 8, is the second solution twice as acidic as the first?
Thank you for your help!!

Verified by AlloprofSecondary IV • 1yr.
I have a hard time understanding how why ° C is used in the thermal energy equation Q = m * c * delta T. In many chemistry exercises, we have to use Kelvin. Thank you

Verified by AlloprofSecondary III • 1yr.
Hello, what's the difference between malleability, elasticity and ductility?

Verified by AlloprofSecondary III • 1yr.
Hello,
Could you explain to me how forces operate on objects and the consequences they can have on them?
Thank you so much!

Verified by AlloprofSecondary III • 1yr.
Hello,
I am having difficulty with the guidings, could you explain to me how it works please?
Thank you so much!

Verified by AlloprofSecondary III • 1yr.
Hello :)
I have trouble understanding the characteristics of the links and understanding what is what (elastic or not, indirect or not, removable, etc.). Can you help me?
Thanks :)))

Verified by AlloprofSecondary III • 1yr.
What is dimensional tolerance and what is the ± (+/) symbol in technical drawings?
thankss

Verified by AlloprofSecondary III • 1yr.
Hello!
I have a lab tomorrow and I have to write a protocol for the dissolution that I have to do, where I have to use a 50 ml volumetric flask and I have to make a concentrated solution of 0.08 g / ml of NaCl. First, how do I calculate the mass of NaCl? Then, can you give me some tips for writing my protocol ??
Thank you !!!

Verified by AlloprofSecondary III • 1yr.
Hello,
Could you explain to me what a dissolution is? I am not sure I understand.
Thank you so much!

Verified by AlloprofSecondary III • 1yr.
Hi!
How do we know if we have a homogeneous or heterogeneous mixture? Also, in which of these 2 categories does a colloid fit?
Thanks already!

Verified by AlloprofSecondary V • 1yr.
What is the difference between weight and mass? Thank you for helping me; I do not understand!!

Verified by AlloprofSecondary V • 1yr.
How is the phenomenon of dispersion explained?

Verified by AlloprofSecondary V • 1yr.
Hi!
How come when I have writing on my sweater and I look at myself in the mirror, I see the writing backwards?
Thank you for your time: D

Verified by AlloprofSecondary V • 1yr.
Hi! Could someone explain to me how white light can scatter in full color when it passes through a prism?

Verified by AlloprofSecondary V • 1yr.
Hi! I’m confusing refraction and reflection. When I look at myself in a mirror, which of the two concepts is it? And what about when I see my straw strangely when it's in my glass of water? Thank you for your help!

Verified by AlloprofSecondary IV • 1yr.
What is the difference between friction and grip?

Verified by AlloprofSecondary V • 1yr.
How do you distinguish different types of forces (I am in the ATS program)?