Chemical cold. Fun chemistry experience at home

ENTERTAINING EXPERIENCES AT HOME
Directory / Entertaining experiences / Experiments in chemistry

Chemical cold. Chemical experiments

Entertaining experiments in chemistry

Entertaining experiences at home / Chemistry experiments for children

Mix 100 g of snow or ice with 33 g of rock salt - the temperature of the resulting mixture will drop to -20 ° C. If you mix 100 g of snow or ice with 100 g of potassium nitrate, the temperature of the mixture will drop to -30 ° C. The temperature of the cooling mixture, consisting of 100 g of snow (or ice) and 150 g of potassium chloride hydrate reaches -45 ° C. And what about in summer, when there is no snow and ice? In the warm season, you can use such chemical compounds that, when dissolved in water, absorb heat, thereby helping to reduce the water temperature to - 35 ° C. Of course, the water must be cold, and the following compounds must be taken in the following proportion (by weight ) in relation to water:

ammonium chloride 3
sodium nitrate 5
ammonium nitrate 10
sodium sulfide + hydrochloric acid 40
ammonium thiocyanate or potassium 15

In order to avoid large losses of cold, it is advisable to prepare the solution in a thermos.

When finished, pour the solution into a cup and remove water from it by evaporating. The substance remaining after evaporation can be reused for experiments.

Author: Shkurko D.I.

We recommend interesting experiments in physics:

▪ Completely black body

▪ Weak spot of ice

▪ Little mouse with big relatives

We recommend interesting experiments in chemistry:

▪ Experiments with enzymes: amylases

▪ When breathing, prints appear on the glass

▪ Plants pump water from roots to leaves

See other articles Section Entertaining experiences at home.

Read and write useful comments on this article.

<< Back

Latest news of science and technology, new electronics:

Artificial leather for touch emulation 15.04.2024

In a modern technology world where distance is becoming increasingly commonplace, maintaining connection and a sense of closeness is important. Recent developments in artificial skin by German scientists from Saarland University represent a new era in virtual interactions. German researchers from Saarland University have developed ultra-thin films that can transmit the sensation of touch over a distance. This cutting-edge technology provides new opportunities for virtual communication, especially for those who find themselves far from their loved ones. The ultra-thin films developed by the researchers, just 50 micrometers thick, can be integrated into textiles and worn like a second skin. These films act as sensors that recognize tactile signals from mom or dad, and as actuators that transmit these movements to the baby. Parents' touch to the fabric activates sensors that react to pressure and deform the ultra-thin film. This ... >>

Petgugu Global cat litter 15.04.2024

Taking care of pets can often be a challenge, especially when it comes to keeping your home clean. A new interesting solution from the Petgugu Global startup has been presented, which will make life easier for cat owners and help them keep their home perfectly clean and tidy. Startup Petgugu Global has unveiled a unique cat toilet that can automatically flush feces, keeping your home clean and fresh. This innovative device is equipped with various smart sensors that monitor your pet's toilet activity and activate to automatically clean after use. The device connects to the sewer system and ensures efficient waste removal without the need for intervention from the owner. Additionally, the toilet has a large flushable storage capacity, making it ideal for multi-cat households. The Petgugu cat litter bowl is designed for use with water-soluble litters and offers a range of additional ... >>

The attractiveness of caring men 14.04.2024

The stereotype that women prefer "bad boys" has long been widespread. However, recent research conducted by British scientists from Monash University offers a new perspective on this issue. They looked at how women responded to men's emotional responsibility and willingness to help others. The study's findings could change our understanding of what makes men attractive to women. A study conducted by scientists from Monash University leads to new findings about men's attractiveness to women. In the experiment, women were shown photographs of men with brief stories about their behavior in various situations, including their reaction to an encounter with a homeless person. Some of the men ignored the homeless man, while others helped him, such as buying him food. A study found that men who showed empathy and kindness were more attractive to women compared to men who showed empathy and kindness. ... >>

Random news from the Archive

Photon from a nanotube 13.07.2016

A carbon nanotube in a silicon dioxide shell has become a reliable emitter of single photons.

The level of technology that physicists have at their disposal makes it possible to work with single smallest particles of matter. Suspending one electron in an electromagnetic trap or creating a lattice of single atoms in optical molasses is no longer a miracle. The next task is to learn how to work not with any, but with a certain particle. Here, for example, is a photon. To ensure the security of quantum communication systems, it is required to emit a single quantum of light per emission event - having encoded information with it, you can not worry that an attacker will read it imperceptibly, the trace will always remain in the form of a disappeared photon.

However, communication systems require infrared photons with a wavelength of 1,3-1,5 microns - they travel best through light guides. And the existing generators - quantum dots or vacancy centers in diamond - cannot cope with this work. Nanotubes seem to be an ideal source, but they emit only at low temperatures and, in addition, are subject to fluctuations. Convinced of this, the materials scientists gave up on these carbon cylinders.

However, not all. Han Htun and Stephen Durn and colleagues from the US Department of Energy's Center for Integrated Technologies deposited a layer of silicon dioxide on the surface of a carbon nanotube. The interaction of carbon with oxygen dramatically changed the properties of the tube: fluctuations disappeared from it, and the photon acquired the desired wavelength. Since silicon dioxide is constantly used in microelectronics, the technology of its application is well developed, and a nanotube in SiO2 clothes can be perfectly integrated into various electronic devices.

Other interesting news:

▪ Who is good at being alone

▪ Large underwater bike park built in Amsterdam

▪ Mean Well HLG-600H - super power supply for LED lighting

▪ Drawing of veins on the hands for bank scanners

▪ Diamond stretching for microelectronics

News feed of science and technology, new electronics

Interesting materials of the Free Technical Library:

▪ section of the site Sites of amateur radio equipment. Article selection

▪ article by David Hume. Famous aphorisms

▪ article How do oil rigs work? Detailed answer

▪ article Conveyor of a crushing and screening plant. Standard instruction on labor protection