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Water is a compound made up of hydrogen and oxygen, so pure water would be water that contains nothing but hydrogen and oxygen. However, pure water of this sort does not normally exist except in the controlled environment of a laboratory. Even in a laboratory pure water is hard to come by.If you want to know if your home's drinking water contains unsafe levels of lead, have your water tested. Testing is the only way to confirm if lead is present or absent. Some faucet and pitcher filters can remove lead from drinking water.A physical test for pure water is testing the boiling or freezing point. Pure water will boil at 100 degrees Celsius and freeze at 0 degrees Celsius. One chemical test is to use cobalt chloride paper - the paper will turn from blue to pink in the presence of water.There are some basic water tests that don't have anything to do with chemical testing: conductivity, odor, sediment, and turbidityAlthough its formula (H2O) seems simple, water exhibits very complex chemical and physical properties. For example, its melting point, 0 ?C (32 ?F), and boiling point, 100 ?C (212 ?F), are much higher than would be expected by comparison with analogous compounds, such as hydrogen sulfide and ammonia.Pure copper(II) sulfate is white. It is also known as anhydrous copper(II) sulfate because it has no water in it. When water is present in a sample of copper(II) sulfate it turns blue.The formula of?water is H2O.?This clearly shows that?water is made up of?hydrogen and oxygen.?Carbon dioxide (CO2) is a molecule that contains one carbon atom?and two?oxygen atoms.The carboxyl group contains the C=O. of the carbonyl group, with the carbon atom also being bonded to a hydroxyl (?OH) group. A carboxylic acid is an organic compound that contains the carboxyl functional groupA ninja (??, Japanese pronunciation: [?i??d?a]) or shinobi (??, [?inobi]) was a covert agent or mercenary in feudal Japan. The functions of a ninja included espionage, deception, and surprise attacks. Their covert methods of waging irregular warfare were deemed dishonorable and beneath the honor of the samurai.A ninja (??, Japanese pronunciation: [?i??d?a]) or shinobi (??, [?inobi]) was?a covert agent or mercenary in feudal Japan. The functions of a ninja included espionage, deception, and surprise attacks. ... Following the unification of Japan under the Tokugawa shogunate in the 17th century, the ninja faded into obscurity.X+12*5=95
X+12=95/5 (transpose 5 on other side)
X+12= 19
X= 19-12 (transpose 12 on other side)
X= 7

Verification:-
7+12* 5=95
19?5= 95 ( first add then multiply)
95=95
So, x= 7
Hence, RHS = LHSTo obtain a real image the light source and the screen must be placed on the same plane. Real images are obtained using a converging lens or a?concave mirror. The size of the real image depends upon the placement of the object.

A virtual image is an upright image that is achieved where the rays seem to diverge. A virtual image is produced with the help of a diverging lens or a?convex mirror. A virtual image is found by tracing real rays that emerge from an optical device backward to perceived or apparent origins of ray divergences. Because the rays never really converge, a virtual image cannot be projected onto a screen.

A real image and a virtual image are different forms of image. The main difference between real and virtual images lies in the way in which they are produced. A real image is formed when rays converge,?whereas a?virtual image?occurs where rays only appear to diverge. Let us look at more differences between real images and virtual images in this article.