Shared Knowledge/Projects/Wikiexperiments

Wikiexperiments (Викиексперименти) is a project by Shared Knowledge aimed at recording high-quality videos of systematically selected experiments for the purposes of illustrating important scientific concepts and phenomena in various sciences. This is an ongoing project that started in September 2015.

Physics videos from the Institute of Physics, Skopje

In December 2015 Shared Knowledge uploaded the first round of high-definition videos of experiments conducted to demonstrate various laws and principles of physics. These 25 demonstrations were performed by Prof. Oliver Zajkov at the Physics Institute at the Ss. Cyril and Methodius University of Skopje, as part of a WikiExperiments project by Shared Knowledge.

The experiments are described in Macedonian and English, and added to articles on the Macedonian and English Wikipedia. Some of them also found their way in other language editions too.

On October 26 and 27 2020, the second season of filming physics experiments has started. Again in collaboration with the professor Oliver Zajkov from the Institute of Physics at the Faculty of Natural Science and Mathematics at the University "Ss. Cyril and Methodius", 12 experiments were recorded. Then on December 14, the third time was realized with the 11 new experiments, with a total result of 23 experiments. This engagement was supported by the "Gothe-Institut" which is a abroad cultural institution of Federal Republic of Germany that operates in learning the German language and nursing the international cultural cooperation. That's why most of the covered experiments were discovered by German scientists such as Julius Plücker, Johann Wilmhelm Hittorf, Eugen Goldstein, Gustav Kirchhoff, Georg Ohm, Johann Christian Poggendorff, Heinrich Geißler...

In 2021, 15 experiments were able to be covered, again with the help of professor Oliver Zajkov from the Institute of Physics, FNSM, Skopje.

Physics gallery

These are the videos of the physics experiments uploaded to Wikimedia Commons. They are described in Macedonian and English, but we would dearly appreciate if the descriptions can be translated in as many languages as possible and placed in their relevant articles on various Wikipedias. The thumbnail descriptions below each video here are short, and merely give an idea about their meaning. Each has a detailed description on its file page.

Note: Clicking on each description under the thumbnail will lead you to the file page with proper full description of the video.

• Suspended weight showing inertia.

• "Pistol Test Tube" experiment

• Reaction force of the Arhimedes's law

• Galileo's Ball

• Floating and sinking test tube

• Glass funnel vacuum action

• Paper sticking in differential pressure

• Angular kinetic energy paper roll

• Viscosity of liquids

• Evaporation cooling with ethanol

• Temperature-pressure dependence in boiling

• Glow discharge in low-pressure tube

• Electrostatic induction

• Electric field force lines

• Demonstration of Ohm's law

• Magnetic field force lines

• Ørsted's law with compass needle and wire

• Ampère's force law

• Lenz's law with electromagnet

• Waltenhofen’s pendulum for eddy current

• Lenz's law with bar magnet and two rings

• Tesla coil wirelessly lighting a neon tube

• Acoustic resonance with tuning forks

• Light radiation pressure with Crookes radiometer

• Moment of inertia with rotating chair

• Spherical aberration

• Dependence of the focal length on the refractive index

• Laser spherical aberration

• Photoeffect

• Ohm's law for part of a circuit

• Ohm's law of electrical resistance

• Figure in a flat mirror

• Refraction of light

• Refraction of light

• Fracture through planar parallel plate

• Boiling under reduced pressure

• Free rotation of a rigid body

• Rotation of a chain

• Rotation of a ring

• Cathode rays

• Geisler's tubes

• Electromagnetic induction

• Acoustic resonance with tuning forks

• Digital acoustic resonance

• Resonance of mathematical pendulums

• Absolute black body radiation

• Kirchhoff's law

• Acoustic resonance with tuning forks

• Polarization at reflection of a pyramid

• Polarization at reflection of a flat glass

• Diffraction mesh

• Diffraction of a CD and DVD

• Lorentz Force with an oscilloscope

• Magnetic field of а straight conductor

• Poggendorff weigh

• Optical lens

• Archimedes' law in an air

• Influence of an atmospheric pressure

• Sound resonance of an air column

• Magnetic field of а solenoid

• Net force

• Net force

• Standing waves

Translation to other languages

Shared Knowledge would be very grateful to the wider Wikimedia community if the descriptions of these scientific videos can be translated from English to as many languages as possible and inserted into the relevant articles on those Wikipedias.

№	Article	en	az	ba	be	be -t	bs	bg	crh	de	el	et	hr	hu	hy	hyw	ka	kk	lt	lv	mk	mt	myv	pl	ro	roa-rup	ru	sh	sk	sl	sq	sr	tr	tt	uk	vro	Σ	Wikidata	st.
1	inertia	+	+	–	+	–	+	+	–	+	+	+	+	+	+	–	+	+	+	+	+	–	–	+	+	–	+	+	+	+	+	+	+	–	+	–	26	Q122508	5	+
2	vapor pressure	+	–	–	+	–	–	+	–	+	+	+	–	+	+	–	–	–	–	–	+	–	–	+	+	–	+	+	–	+	–	+	+	–	+	–	17	Q2661322	8	+
3	Archimedes (287 BCE–212 BCE)	+	+	+	+	+	+	+	–	+	+	+	+	+	+	–	+	+	+	+	+	+	+	+	+	–	+	+	+	+	+	+	+	+	+	+	32	Q8739	27	+
4	buoyancy	+	+	–	+	–	+	+	–	+	+	+	+	+	–	–	–	–	–	–	–	–	–	+	+	–	+	+	–	+	–	+	+	–	+	–	18	Q6497624	7	+
5	suction	+	–	–	–	–	–	–	–	+	–	–	–	–	–	–	–	–	–	–	–	–	–	–	–	–	+	–	–	–	–	–	–	–	+	–	4	Q1790295	4	+
6	Bernoulli's principle	+	+	–	+	–	+	+	–	+	+	+	+	+	+	–	–	+	+	+	+	–	–	+	+	–	+	+	+	+	–	+	+	–	+	–	24	Q181328	12	+
7	rotational energy	+	–	–	–	–	–	–	–	+	–	–	–	–	–	–	–	–	–	+	–	–	–	–	–	–	+	–	–	–	–	–	–	–	–	–	4	Q2140940	7	+
8	Magnus effect	+	–	–	+	+	–	+	–	+	+	–	–	+	–	–	–	+	–	+	–	–	–	+	+	–	+	–	+	–	–	+	+	–	+	–	16	Q622975	5	+
9	viscosity	+	+	–	+	–	+	+	–	+	+	+	+	+	+	–	+	+	+	+	+	–	+	+	+	–	+	+	+	+	–	+	+	–	+	–	26	Q128709	12	+
10	evaporation	+	+	–	+	–	+	+	–	+	+	+	+	+	+	–	–	+	+	+	+	–	–	+	+	–	+	+	+	+	–	+	+	–	+	–	24	Q132814	10	+
11	boiling point	+	+	–	+	+	+	+	–	+	+	+	+	+	+	–	+	+	+	+	+	–	–	+	+	–	+	+	+	+	–	+	+	–	+	–	26	Q1003183	11	+
12	cathode ray	+	–	–	+	–	–	+	–	+	–	+	+	+	–	–	–	–	–	–	–	–	–	–	+	–	+	+	–	+	–	+	+	–	+	–	14	Q207340	3
13	electric glow discharge	+	–	–	–	–	–	+	–	+	–	+	–	–	–	–	–	+	–	+	–	–	–	+	–	–	+	–	–	–	–	–	+	+	+	–	11	Q1427934	4	+
14	electroscope	+	–	–	+	+	–	–	–	+	+	+	+	–	–	–	–	+	+	–	+	–	–	+	–	–	+	+	–	+	–	+	+	+	+	–	18	Q130962	3	+
15	electrostatic induction	+	+	–	–	–	–	+	–	+	–	+	+	–	–	–	–	+	–	+	+	–	–	+	–	–	+	+	–	–	–	+	+	–	+	–	15	Q841249	4	+
16	electric field	+	+	–	+	+	+	+	–	+	+	+	+	+	+	–	+	+	+	+	+	–	–	+	+	–	+	+	+	+	+	+	+	+	+	–	28	Q46221	6	+
17	Ohm's law	+	+	–	+	–	+	+	–	+	+	+	+	+	+	–	–	+	+	+	+	–	–	+	+	–	+	+	+	+	+	+	+	+	+	–	26	Q41591	9	+
18	field line	+	–	–	–	–	–	+	–	+	–	+	+	–	+	–	–	+	–	–	+	–	–	–	–	–	+	+	–	–	–	+	–	–	+	–	12	Q1810738	4	+
19	Oersted's law	+	–	–	–	–	–	–	–	–	–	+	+	+	–	–	–	–	–	–	–	–	–	+	–	–	+	–	–	–	–	–	–	–	+	–	7	Q3733130	6	+
20	Ampère's force law	+	+	–	+	–	–	–	–	+	–	+	–	–	+	–	–	–	–	+	+	–	–	+	–	–	+	–	–	–	–	–	–	+	+	–	12	Q2359410	7	+
21	Lenz's law	+	–	–	+	–	–	+	–	+	+	+	+	+	+	–	+	–	–	–	+	–	–	+	+	–	+	+	+	+	–	+	+	–	+	–	20	Q192288	4	+
22	eddy current	+	–	–	–	–	–	+	–	+	–	+	+	+	+	–	–	–	–	+	+	–	–	+	+	–	+	+	+	–	–	+	+	–	+	–	17	Q208598	4	+
23	alternating current	+	+	–	+	+	+	+	–	+	+	+	+	+	+	–	–	+	+	+	+	–	–	+	+	–	+	+	+	+	–	+	+	–	+	–	25	Q124164	15	+
24	Tesla coil	+	+	–	–	–	–	–	–	+	+	+	+	+	–	–	–	–	–	–	–	–	–	+	+	–	+	+	+	–	–	+	+	–	+	–	15	Q622424	7	+
25	Nikola Tesla (1856–1943)	+	+	+	+	+	+	+	+	+	+	+	+	+	+	+	+	+	+	+	+	–	–	+	+	–	+	+	+	+	+	+	+	+	+	–	31	Q9036	41	+
26	sound	+	+	+	+	+	+	+	–	+	+	+	+	+	+	+	+	+	+	+	+	–	+	+	+	–	+	+	+	+	+	+	+	–	+	+	31	Q11461	11	+
27	resonance	+	+	–	+	+	+	+	–	+	+	+	+	+	+	–	+	+	+	–	+	–	+	+	+	–	+	+	–	+	–	+	+	–	+	–	25	Q172858	6	+
28	acoustic resonance	+	–	–	–	–	–	–	–	–	–	+	+	–	–	–	–	–	–	–	+	–	–	+	–	–	–	+	–	–	–	–	+	–	+	–	8	Q2558427	3	+
29	Crookes radiometer	+	–	–	–	–	–	–	–	+	–	–	–	–	–	–	–	–	–	–	–	–	–	+	–	–	+	–	+	–	–	–	–	–	+	–	6	Q1334758	6	+
30	moment of inertia	+	–	–	+	+	+	+	–	+	+	+	+	+	+	–	+	+	+	–	+	–	–	+	+	–	+	+	+	+	+	+	+	+	+	–	26	Q165618	9	+
31	lens	+	+	–	+	+	+	+	–	+	+	+	+	+	+	–	–	+	+	+	+	–	–	+	+	–	+	+	+	+	+	+	+	+	+	–	27	Q768575	14	+
32	spherical aberration	+	–	–	–	–	–	+	–	–	+	–	+	+	–	–	+	+	–	–	–	–	–	+	+	–	+	–	+	+	–	+	+	–	+	–	15	Q2913798	1
33	refractive index	+	+	–	+	–	+	+	–	+	+	+	+	+	+	–	–	–	+	+	+	–	–	+	+	–	+	+	+	+	–	+	+	–	+	–	23	Q174102	12	+
34	focus	+	–	–	+	–	+	+	–	+	–	+	+	–	+	–	–	+	–	+	+	–	–	+	+	–	+	+	+	+	–	+	+	–	+	–	20	Q190909	4	+
35	focal length	+	–	–	–	–	–	+	–	+	+	+	+	+	–	–	–	–	+	–	–	–	–	+	+	–	+	+	+	+	–	+	+	–	+	–	17	Q193540	9	+
36	laser	+	+	+	+	+	+	+	–	+	+	+	+	+	+	–	+	+	+	+	+	–	–	+	+	–	+	+	+	+	+	+	+	+	+	+	30	Q38867	9	+
37	photoelectric effect	+	+	+	+	–	+	+	–	+	+	+	+	+	+	–	+	+	+	+	+	–	–	+	+	–	+	+	+	+	+	+	+	–	+	–	27	Q83213	5	+
38	electrical network	+	–	–	+	–	+	+	–	+	+	+	+	+	–	–	–	–	+	+	+	–	–	+	+	–	+	+	+	+	+	+	+	–	+	–	22	Q132629	9	+
39	electrical resistance	+	+	–	+	+	+	+	–	+	+	+	+	+	+	–	+	+	+	+	+	–	–	+	+	–	+	–	+	+	+	+	–	+	+	–	26	Q25358	15	+
40	plane mirror	+	–	–	–	–	–	–	–	+	–	+	+	–	–	–	–	–	–	–	–	–	–	–	–	–	–	–	–	–	–	+	+	–	–	–	6	Q964338	1
41	refraction	+	+	–	+	–	–	+	–	+	+	+	+	+	+	–	–	+	+	+	+	–	–	+	+	–	+	+	–	+	–	+	+	–	+	–	22	Q72277	6	+
42	light	+	+	+	+	+	+	+	–	+	+	+	+	+	+	+	+	+	+	+	+	–	–	+	+	–	+	+	+	+	+	+	+	+	+	+	31	Q9128	14	+
43	wave	+	+	–	+	+	+	+	–	+	+	+	+	+	+	–	+	+	+	+	+	–	–	+	+	–	+	+	+	+	+	+	+	–	+	–	27	Q37172	7	+
44	birefringence	+	–	–	+	–	+	+	–	+	–	+	+	–	–	–	–	–	–	–	+	–	–	+	+	–	+	+	+	+	–	–	+	–	+	–	16	Q108779	2	+
45	boiling point	+	+	–	+	+	+	+	–	+	+	+	+	+	+	–	+	+	+	+	+	–	–	+	+	–	+	+	+	+	–	+	+	–	+	–	26	Q1003183	11	+
46	pressure	+	+	–	+	+	+	+	–	+	+	+	+	+	+	–	+	+	+	+	+	–	+	+	+	–	+	+	+	+	+	+	+	+	+	–	29	Q39552	13	+
47	rotation	+	–	–	–	–	+	+	–	+	+	+	+	+	–	–	–	+	–	–	+	–	–	+	+	–	+	+	–	+	–	+	+	–	+	–	18	Q107617	7	+
48	cathode ray	+	–	–	+	–	–	+	–	+	–	+	+	+	–	–	–	–	–	–	–	–	–	–	+	–	+	+	–	+	–	+	+	–	+	–	14	Q207340	3
49	cathode ray tube	+	+	–	–	–	–	+	–	+	+	+	+	+	–	–	–	–	+	+	–	–	–	+	+	–	+	+	+	+	–	+	+	–	+	–	19	Q83913	10	+
50	Geissler tube	+	–	–	–	–	–	–	–	+	–	–	+	–	–	–	–	–	–	–	–	–	–	+	+	–	–	+	–	+	–	–	–	–	+	–	8	Q537792	3	+
51	electromagnetism	+	–	–	–	–	+	+	–	+	–	+	+	+	+	–	+	–	–	+	+	–	–	+	+	–	+	+	+	+	+	+	+	+	+	–	22	Q11406	8	+
52	electromagnetic induction	+	+	–	+	+	+	+	–	+	+	+	+	+	+	–	–	+	+	+	+	–	–	+	+	–	+	+	+	+	–	+	+	–	+	–	25	Q988780	9	+
53	beat	+	–	–	–	–	–	+	–	+	–	+	–	+	–	–	–	–	–	–	–	–	–	+	–	–	+	–	–	–	–	–	–	–	+	–	8	Q829522	5	+
54	pendulum	+	–	–	+	–	–	–	–	+	–	+	–	+	+	–	–	+	+	+	–	–	–	+	–	–	+	+	+	+	–	+	–	–	+	–	16	Q829360	2	+
55	radiation	+	+	–	+	+	+	+	–	+	+	+	+	–	+	–	+	+	+	+	–	–	–	+	+	–	+	+	+	+	–	+	+	–	+	+	25	Q18335	7	+
56	electromagnetic radiation	+	+	+	+	+	+	+	–	+	+	+	+	+	+	–	+	–	+	+	+	–	–	+	+	–	+	+	+	+	+	+	+	–	+	+	28	Q12969754	10	+
57	black-body radiation	+	–	–	–	–	–	–	–	+	–	+	+	+	–	–	–	–	–	–	–	–	–	–	–	–	–	+	–	–	–	+	+	–	–	–	8	Q900097	4	+
58	black body	+	+	–	+	–	+	+	–	+	+	+	+	–	+	–	+	+	+	+	+	–	–	+	+	–	+	+	+	+	–	+	+	–	+	–	24	Q161424	6	+
59	Gustav Kirchhoff (1824–1887)	+	+	–	+	+	+	+	–	+	+	+	+	+	+	–	+	+	+	+	+	–	–	+	+	–	+	+	+	+	+	+	+	+	+	–	28	Q60052	24	+
60	Kirchhoff's circuit laws	+	+	–	+	–	–	+	–	+	+	+	+	+	+	–	–	+	–	+	+	–	–	+	+	–	+	+	+	+	+	+	+	+	+	–	24	Q187672	5	+
61	polarization	+	–	–	+	–	–	+	–	+	+	+	+	+	+	–	–	–	+	–	+	–	–	+	+	–	+	+	–	+	–	+	+	+	+	–	20	Q193760	3	+
62	diffraction	+	+	–	+	–	–	+	–	+	+	+	+	+	+	–	–	+	+	+	+	–	–	+	+	–	+	+	+	+	–	+	+	–	+	–	23	Q133900	4	+
63	diffraction grating	+	–	–	+	–	–	+	–	+	–	+	+	–	+	–	–	+	+	–	–	–	–	+	–	–	+	–	+	+	–	+	+	–	+	–	16	Q653294	5	+
64	Lorentz force	+	+	–	+	+	–	+	–	+	+	+	+	+	+	–	+	+	–	+	+	–	–	+	+	–	+	+	+	+	+	+	+	+	+	–	26	Q172137	9	+
65	oscilloscope	+	+	–	+	+	+	+	–	+	–	+	+	+	–	–	–	+	+	+	–	–	–	+	+	–	+	+	+	+	+	+	+	–	+	–	23	Q174320	8	+
66	Johann Christian Poggendorff (1796–1877)	+	–	–	–	–	–	+	–	+	–	–	–	+	–	–	–	–	–	–	–	–	–	+	–	–	+	–	–	–	+	–	–	–	+	–	8	Q61197	23	+
67	Archimedes' principle	+	+	–	+	–	–	+	–	+	+	+	+	+	+	–	+	+	+	+	+	–	–	+	+	–	+	+	+	+	+	+	+	+	+	–	26	Q181404	7	+
68	vacuum	+	+	+	+	+	+	+	–	+	+	+	+	+	+	–	+	+	+	+	+	–	–	+	+	–	+	+	+	+	+	+	+	+	+	–	29	Q11475	10	+
69	net force	+	–	–	+	–	–	–	–	+	+	+	–	–	–	–	–	–	–	–	–	–	–	+	–	–	–	–	–	–	–	–	+	–	+	–	8	Q868425	3
70	vector	+	+	–	–	–	–	–	–	–	+	–	–	–	+	–	–	–	–	–	–	–	–	–	+	–	+	–	–	–	–	–	–	–	+	–	7	Q13471665	5	+
71	vector notation	+	–	–	–	–	–	–	–	–	–	–	–	–	–	–	–	–	–	–	–	–	–	–	–	–	–	–	–	–	–	–	–	–	–	–	1	Q7917835	1
72	standing wave	+	–	–	+	–	–	+	–	+	+	+	+	+	+	–	+	+	+	+	–	–	–	+	+	–	+	+	+	–	–	–	+	+	+	–	21	Q123300	6	+
73	interference	+	+	–	+	–	+	+	–	+	+	+	+	+	+	–	–	–	+	+	+	–	–	+	+	–	+	+	+	+	–	+	+	+	+	–	24	Q136980	5	+
74	solenoid	+	–	–	–	–	–	+	–	+	+	+	–	–	+	–	–	+	+	–	–	–	–	+	–	–	+	+	–	–	+	+	+	–	+	–	15	Q245739	4	+
75	magnetic field	+	+	+	+	+	+	+	–	+	+	+	+	+	+	–	+	+	+	+	+	–	–	+	+	–	+	+	+	+	+	+	+	+	+	–	29	Q11408	7	+
76	coil	+	–	–	–	–	–	–	–	+	–	–	–	–	–	–	–	–	+	–	–	–	–	+	–	–	+	–	–	–	–	–	+	–	+	–	7	Q2981904	8	+
77	electromagnet	+	+	–	+	–	–	+	–	+	+	+	+	+	–	–	–	–	+	+	+	–	–	+	+	–	+	+	+	+	+	+	+	–	+	–	22	Q178032	7	+
Σ	→ Autolist→ gallery→ timeline	77	42	9	53	25	37	61	1	72	52	67	62	56	48	3	28	45	45	47	49	1	5	68	57	0	71	60	50	55	27	61	64	23	73	6	1,500	avg: 19\43\56%	610

Chemistry videos from the Institute of Chemistry, Skopje

The experiments are described in Macedonian and English, and added to articles on the Macedonian and English Wikipedia. Some of them also found their way in other language editions too.

In June 2016 Shared Knowledge uploaded the first round of high-definition videos of experiments conducted to demonstrate various reactions in chemistry. These 20 demonstrations and experiments were performed by Prof. Vladimir Petruševski at the Institute of Chemistry at the Ss. Cyril and Methodius University of Skopje, as part of a WikiExperiments project by Shared Knowledge.

On January 22 2020, in collaboration with Professors Vladimir Petruševski, Marina Stojanovska and Miha Bukleski from the Institute of Chemistry at the Faculty of Natural Sciences and Mathematics at the University "Ss. Cyril and Methodius", have 22 recorded experiments of chemistry.

Filming videos within the Wikiexperiments project has continued on July 6, 2021. That day, at the Institute of Chemistry, with the help and demonstration of two professors - Vladimir Petruševski, Marina Stojanovska; and one associate professor/docent - Miha Bukleski, we managed to cover 18 chemistry in span of four hours. On 25th of October, Shared Knowledge again collaborated these chemistry professors at Faculty of Natural Sciences and Mathematics. In this occasion, we were able to record 5 chemistry experiments. The last date of filming experiments in 2021 was on November 9, by recording 5 videos with the help of now retired professor Vladimir Petruševski and Marina Stojanovska.

On June 1, 2022, from 10 AM to 12 PM, at the Institute of Chemistry were recorded 8 chemistry experiments that were =performed by Vladimir Petruševski and Marina Stojanovska.

On February 13, from 10 am to 1:30 pm, we were again at the Institute of Chemistry where we recorded 18 chemical experiments. The experiments were planned and performed by the retired Prof. PhD- Vladimir Petrushevski, the Prof. PhD Miha Bukleski, and the students Mihail Trajkov and Darko Stojčev.

Chemistry gallery

These are the videos of the chemistry experiments uploaded to Wikimedia Commons. They are described in Macedonian and English, but we would dearly appreciate if the descriptions can be translated in as many languages as possible and placed in their relevant articles on various Wikipedias. The thumbnail descriptions below each video here are short, and merely give an idea about their meaning. Each has a detailed description on its file page.

Note: Clicking on each description under the thumbnail will lead you to the file page with proper full description of the video.

• Direct synthesis of aluminum bromide

• Reaction of the product Al2Br6 with water

• Burning of sulfur in oxygen

• Preparation of amorphous silicon and magnesium silicide

• Magnesium silicide is added to 10% hydrochloric acid

• Direct synthesis of aluminum iodide

• Dehydration properties of concentrated sulfuric acid

• Direct synthesis of ammonium chloride

• Slaking of quicklime as a strongly exoenergetic reaction

• Oxidation of a piece of charcoal in molten potassium nitrate

• Synthesis of a basic oxide

• Disproportionation reaction

• Catalytic decomposition of hydrogen peroxide

• 'Elephant toothpaste'

• Large amount of energy released upon combustion of ethanol

• Reaction between a strong oxidizing and a reducing agent

• Explosive properties of three different explosives

• Leidenfrost effect

• Explosion of a hydrogen–air mixture

• Phenomenon of discontinuous thermochromism

• Does water always put out fire?

• Endothermic reaction

• Artificial snow with Natrium polyacrylate

• Carbon dioxide with lime water

• Döbereiner's lighter

• Burning of Zn, Fe, Mg, Al, Cu, Se, Ni

• Simple titration

• Extrusion reaction

• 'Magic drinks'

• Reaction of Copper (II) oxide with sulfuric acid

• Implosion of a soda can

• Crystallization of sodium acetate

• Silver mirror