This depends on the gas and concentration; many tests exist based on the reaction of gas with a specific reagent.
To test an unknown substance at home, you can use simple methods like observing its physical properties (such as color, texture, and smell), conducting a solubility test, performing a flame test, using pH strips for acidity/basicity, and conducting a simple chemical reaction test. Remember to handle unknown substances with caution and always wear appropriate safety gear.
It is not an ideal test but it is sometimes useful in qualitative analytical chemistry; also is simple and cheaper.
by using a litmus paper
New research suggests that a simple blood test may identify people at risk of colorectal cancer. The blood test detects a genetic alteration that may identify people who are likely to develop the disease
There are many different tests that can be used to identify different metals. Using a magnet is a popular test to distinguish metals.
You could test for the production of carbon dioxide.
The only way to pass a drug test is to stop using drugs. Simple as that.
New research suggests that a simple blood test may identify people at risk of colorectal cancer. The blood test detects a genetic alteration that may identify people who are likely to develop the disease
Blot, dip, wipe
One common procedure to identify metals is through a flame test, where the metal sample is heated in a flame and the characteristic color of the flame produced can help identify the metal. Other methods include using reactivity with acids or other chemicals, measuring density, conducting an electrical conductivity test, or using spectroscopic techniques to analyze the metal's atomic structure.
One can detect methanol in alcoholic drinks by using a simple chemical test called the chromic acid test. This test involves mixing a small amount of the drink with a solution of chromic acid and sulfuric acid. If methanol is present, the solution will change color from orange to green. This test can help identify potentially harmful levels of methanol in alcoholic beverages.
Who knows? You need to test the circuit with a test light or digital multimeter. It could be as simple as a blown fuse, or it could be a defective car stereo.