Help Zone

RobotLibre9516

Hey !

What's the difference between an animal cell and a plant cell.

Thanks in advance!

DeltaPotassium727

Hello! Is the movement of a hand on a clock helical or a rotation? I don’t understand these two movements, can I have examples of the 2 please?

Thank you!

DeltaPotassium727

Hello!

What does it mean when litmus paper does not change color? Thank you!

DeltaPotassium727

Hi,

In my homework, I have to find an example of something acidic and something basic, can you give me some examples?

Thank you !!

LionSolidaire8599

What is the atmosphere composed of and how do humans affect its composition? Thanks a lot!

NaiveAbafar3712

I don't understand the logic of the periodic table. Why does it have this weird shape? Why not just a rectangle? How come the items are classified like this?

NaiveAbafar3712

Hello,

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

Can you help me ?

Thanks

FastFox1311

Hello, what's the difference between malleability, elasticity and ductility?

FastFox1311

Hello,

Could you explain to me how forces operate on objects and the consequences they can have on them?

Thank you so much!

FastFox1311

Hello,

I am having difficulty with the guidings, could you explain to me how it works please?

Thank you so much!

FastFox1311

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 :)))

FastFox1311

What is dimensional tolerance and what is the ± (+/-) symbol in technical drawings?

thankss

FastFox1311

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 !!!

FastFox1311

Hello,

Could you explain to me what a dissolution is? I am not sure I understand.

Thank you so much!

FastFox1311

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!

HumbleArmadillo3023

Hello,

I'm having a hard time figuring out what a cut and section are when it comes to technical drawings. Could you please explain it to me?

Thank you so much!

HumbleArmadillo3023

Hi!

In my science homework, I am asked to reproduce a drawing at 2:1 scale, but what does that mean?

Thanks :))

HumbleArmadillo3023

Hi,

How do I find the best possible orientation for a cut-through view?

HumbleArmadillo3023

Do you always have to put all views of an object in a multiple view projection? I find it long!

HumbleArmadillo3023

What is isometric projection used for and what is the difference with an oblique projection? Thanks for the help

SkillfulGrasshopper3789

Hi

I am having difficulty differentiating endothermic and exothermic reactions when using the enthalpy and not using it.

Can you help me? Thank you

TomateSupra7536

Hydrogen has a valence electron. True or false: it is part of the alkali metal group?

SkillfulGrasshopper3789

Hi!! Can someone explain to me the difference between temperature and heat? Thank you times a thousand !!

TomateSupra7536

In a periodic table, how do the electronegativity, atomic mass, ionization energy, and atomic radius of the elements vary?

TomateSupra7536

Hello,

I am having difficulty distinguishing the characteristics of metals, nonmetals and metalloids. Also, where can they be found in the periodic table?

Thank you so much!

TomateSupra7536

Does the way the periods are arranged in the periodic table mean anything? thank you

SkillfulGrasshopper3789

Hi!

I came across a difficult question:

Balance the following equation. Then, find the rate (in mol/s) of the reaction when 20 mL of HCl takes 30 seconds before reacting and form products. *The reaction takes place at constant temperature and pressure (25 ° C. and 101.3 kPa).

SXW7eVI3bCQf_iXiLZIXjl7H6Op784wtkwLySf-5RDbgjNq8944_hJcyTtTlTS2Cv4pTEYs7fYADlwb5eZV4Foy-blphn3niTMxdf5YzjKD8-ydVhwNzjOLU_mIBt-ElqFK8D7IU=s0

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.

TomateSupra7536

Hello! I'm not sure I understand why isotopes change the atomic mass of an atom ... Can you help me? Thank you very much in advance!

SkillfulGrasshopper3789

In one of my exercises, we must find out the quantity of product of a photosynthesis reaction such as this one:

CO2 + H2O → C6H12O6 + O2

The initial concentration of Carbon Dioxide is 62 mol / L, and the oxygen's concentration is 84 mol / L.

SkillfulGrasshopper3789

Can we add molecules and atoms to chemical equations when we balance them?

Help Zone

Science

Science

Filters

Help Zone

Science

Science

Discussion List