Discover Top Posts Tagged with #melchemistry

Popular Recent

Link for Stories: https://melscience.com/sBGv/ Link for bio: https://melscience.com/sBGu/ CAPTION AD | The most fun these two had while learning some science! Moms (and dads ;)), bookmark @melscience subscription : it’s a must-have for everyone! There are 18 STEM DIY projects that are included in a subscription plan with new science topics delivered monthly to your door. They also offer free online lessons with professional science teachers, AR science lessons within MEL science app, learning through storytelling and so much more. I would definitely recommend MelScience for homeschoolers or those on distance learning, but more than anything, it’s such a great way to spend time together away from tablets and gadgets! Just look at kids' faces - this was the first time they were playing, and every emotion is as pure as it gets! They had SO much fun. I only wish I had pictures of Nikola’s face when he was helping Evyianne. It was hard to tell who enjoyed it more :) I also have a special offer for you: 60% off the first month on ANY subscription. Use my promo code: NOTES60 (It is only valid for one month though, so make sure to take advantage of it!) (choose from Chemistry, STEM, Physics, Coding, Med, Professions. ALL are worth every penny!) Just use the link in my Stories! . 📷: @theframed.photography . #melscience #kids #melchemistry #melphysics #melkids #melmed #science #stem (at Venice Beach) https://www.instagram.com/p/CdeBMMHOJmu/?igshid=NGJjMDIxMWI=

#melscience #kids #melchemistry #melphysics #melkids #melmed #science #stem

View this post on Instagram

Where are all the cool mums here 🙌🏾 I’m not just a mum, I’m a cool science mum 😃. This @melscience Kit has been keeping me and my girls very busy and active during this holiday period. We’re loving every bit of it. Which mum doesn’t like a learning kit that also seem like fun for the kids! @melscience kit does not feel like studying, but they’re actually doing a science experiment while having so much fun all at the same time. Even I’m learning so much as well. The kit is so handy you can take it on holiday so the kids have some extra fun learning. Alice and Gabriella kept on going about how cool the experiment safety goggles are. Head to my stories to see some photos of the girls really getting into this science project. Gaby built the Tin Dentrite all by herself while talking Alice through. @melscience kit is definitely a must have for parents. It’s been tried and tested, and I sure approve. #ad #melscience #melchemistry # melkids #melphysics #melsciencepartner https://www.instagram.com/p/CSG_xE6IkrA/?utm_medium=tumblr

#ad #melscience #melchemistry #melphysics #melsciencepartner

View this post on Instagram

#Wow😳😲 from @melscience - How was your May? Let's look back on the most spectacular experiments of this month😄 #melscience #melchemistry #coolexperiments #AluminumCan #Cans #Wow #Amazing #Science #bestexperiments #thebest #scienceisfun #IAm_MsJohnson 💞 - #regrann https://www.instagram.com/p/BzhK8YrhC95/?igshid=6glqcnws9w29

#wow😳😲#melscience #melchemistry #coolexperiments #aluminumcan #cans #wow #amazing #science #bestexperiments #thebest #scienceisfun #iam_msjohnson #regrann

View this post on Instagram

from @melscience - Even easier, but just as effective! ⠀ Wrap the charcoal in a napkin and pulverize it with the hammer. Make some holes in the bottom of the plastic bottle. Insert some cotton balls, then add some charcoal. Cover with another layer of cotton balls. Your makeshift filter is ready! As the dirty water passes through the filter, the cotton ball layers trap the largest particles of dirt. Meanwhile, charcoal, with its myriad pores and crevices, traps the smaller pollutant molecules in a process called adsorption. The relatively large pollutant molecules “stick” to the charcoal’s surface, while the water molecules, minuscule in comparison, pass easily through the filter. This filter can cleanse water of large particles and some organic compounds but is powerless against microorganisms and heavy metals. Boil any filtered water to make it suitable to drink. #melscience #melchemistry #coolexperiments #diy #lifehack #waterfilter #purewater #surviving #IAm_MsJohnson 💞 - #regrann https://www.instagram.com/p/BzhJMjrBEut/?igshid=yr409dzk881p

#melscience #melchemistry #coolexperiments #diy #lifehack #waterfilter #purewater #surviving #iam_msjohnson #regrann

Metal contest 2: copper dendrites

This experiment is another example of a single displacement reaction where a more active metal displaces the less active one from its solution. This time performed on a filter paper to reveal the beautiful copper crystals in a shape of a tree and thus called dendrites.

For this experiment you’ll need a 10% solution of a copper sulfate, a filter paper in a dish (like a Petri dish) and some pieces of metals. A zinc pellet or a piece of iron is good (both metals are more active than copper). It’s also possible to use different metals and compare the result. There intensity of dendrite growth will depend on the metal activity.

If you have a MEL Science subscription, you might already have a dish and a zinc pellet from the “Tin” set and a copper sulfate from the “Metal contest” set. To make a solution, dissolve a half of a big measuring spoon of copper sulfate in 10 ml water. As for filter paper, you can take any paper that absorbs water. A coffee filter or even a paper kitchen towel. As for the pieces of metals, try a paperclip, a nail, a pin or even a hedgehog from the “Tin hedgehog” experiment. Just take into account, that paperclips may be made of different metals, not only iron. And steel (mostly iron) nails, pins and paperclips may be covered with a thin layer of zinc. It is not a problem for this experiment. Make sure that the metallic object has a flat side to make good contact with a filter paper.

The instructions are easy. Place the filter paper into a dish and moisten it with the 10% copper sulfate solution. Not too much, just make it all wet. Place the pieces of metal on the filter paper. Make sure they touch the paper. Cover the dish and wait for some hours (or leave it for the night). Observe the brownish dendrites of metallic coppers grown around the piece of metal.

In case of several pieces of different metals, the result will reflect the metal’s reactivity to some extent.

In general, the more active metal (see the reactivity series), the more dendrites should grow and the farther they reach. But even there is a correlation between the metal’s reactivity and the amount of dendrites, there are still other factors to consider. Like the size of the pellet, its purity, its ability to form a protective layer of oxides (which prevents the reaction), contact between the metal surface and the solution on the filter paper etc.

You may also like to watch the MEL Science version of this experiment (see instructions in the video description on YouTube):

Metal contest

MEL Science suggests to look at the single displacement reaction as a sport competition where the metals are athletes. In this contest the more active metal replaces the less active one in a solution. And the “strength” or reactivity is pre-determined and arranged in a reactivity series.

In their experiment from the “Metal contest” set they suggest to observe how more active zinc replaces copper from copper (II) sulfate solution and tin from tin (II) chloride. You can find the detailed instructions and explanation on their webpage.

An easy way to observe a single displacement reaction. There is not much to add, so here is what I got:

The reactivity series gives a lot of combinations to experiment with, so there is more to come. And at risk of preempting myself, let me tell you that not all of them will go as expected.

Like on this video you can clearly observe gas bubbles as a result of a secondary process. Both copper (II) sulfate and tin (II) chloride tend to hydrolyse in a solution and form acidic environment (sulfuric or hydrochloric acid):

Cu2+ + SO42- + HOH ⇄ CuOH+ + SO42- + H+

Sn2+ + 2Cl- + HOH ⇄ SnOH+ + Cl- + H+

Zinc reacts with either sulfuric or hydrochloric acid and replaces hydrogen which forms gas bubbles and escapes.

#Repost @melscience (@get_repost) ・・・ Once you try it, you can't resist it 😉 Which trick is your favorite? ⠀ Rub the balloon vigorously on your hair to electrify it. Hold it a small distance away from your hair and observe how your hair is pulled to the balloon. Try the oatmeal experiment, and “pull” the balloon to your hand! All the objects surrounding us can be described as matter. Matter consists of atoms, and atoms consist of charged particles: protons and electrons (and electrically-neutral neutrons). Electrons carry a negative charge, while protons are positively charged. Usually, they balance each other out, keeping objects neutrally charged. When frictional forces arise between two objects, the surface-layer atoms of one object can give some of their electrons to the other object. The object that gives up its electrons becomes positively charged, and the one that accepts electrons acquires a negative charge. In our experiment, the balloon’s surface accepts some electrons and becomes negatively charged. An electric field appears around it, and attractive forces appear between the balloon and the positively- and neutrally-charged surrounding objects. Consequently, lightweight hair and oatmeal flakes are attracted to the balloon, and heavy objects, such as a hand, attract the balloon to themselves. #melscience #melchemistry #coolexperiments #safeexperiments #diy #balloons #tricks #fun #scienceathome https://www.instagram.com/p/BxKVq-BAHuy/?utm_source=ig_tumblr_share&igshid=1nnaofkg7gpyo

#repost #melscience #melchemistry #coolexperiments #safeexperiments #diy #balloons #tricks #fun #scienceathome

Tin crystals as a hedgehog

This is an example of a displacement reaction. A more active element displaces a less active one from its salts. In case of metals there is a reactivity series where all metals are arranged by their activity from the highest to the lowest (vertically or horizontally).

A short example of reactivity series looks like:

K→Ca→Na→Mg→Al→Zn→Fe→Co→Ni→Sn→Pb→H→Cu→Ag

Potassium is the most active in this particular example and silver is the least one.

For a full version, please, visit a Wikipedia article on reactivity series.

In this experiment zinc as a more active metal displaces tin from a solution of tin chloride. Metallic tin is disposed on a zinc pellet and forms beautiful crystals. A tin covered zinc pallet might remind you of a hedgehog. Or a lovely frosted pine tree (with help of a macro lens).

The reaction can be written as:

SnCl2 + Zn → Sn + ZnCl2

Addiction of acid to tin chloride solution is needed to suppress its hydrolysis in water. Normally a hydrochloric acid is used for a chloride salt, but other strong acids will do too. Even an acidic salt like sodium hydrogen sulphate (which is safer to work with than an acid).