The branch of chemistry involved in determining the amount of nitrogen in a sample of air is called analytical chemistry. This field focuses on the qualitative and quantitative analysis of substances, using various techniques to identify and measure chemical components. Methods such as gas chromatography or mass spectrometry may be employed to analyze the composition of air samples.
An air freshener is a mixture of many chemical substances, so there is no definitive chemical structure for an air freshener.
A stain is the result of an interaction between substances.
A characteristic property is a chemical or physical property that helps identify and classify substances. The characteristic properties of a substance are always the same whether the sample you are observing is large or small.
In a one liter sample of dry air, there are approximately 780 mL of nitrogen and 210 mL of oxygen. Nitrogen makes up about 78% of dry air while oxygen makes up about 21%.
Feathers are lightweight and have a large surface area, which can trap air and make them appear heavier compared to denser substances with the same weight. This is due to the buoyancy of air and the presence of trapped air pockets within the feathers, which can add to their overall apparent weight.
chemical change
- place a sample in a refrigerator- place a sample in liquid nitrogen
chemical properties can be observed only when the substances in a sample of matter are changing into different substances
The branch of chemistry involved in determining the amount of nitrogen in a sample of air is called analytical chemistry. This field focuses on the qualitative and quantitative analysis of substances, using various techniques to identify and measure chemical components. Methods such as gas chromatography or mass spectrometry may be employed to analyze the composition of air samples.
air
Chemical Properties can be observed only when substances in a sample of matter are changing into different substances.
An air freshener is a mixture of many chemical substances, so there is no definitive chemical structure for an air freshener.
A stain is the result of an interaction between substances.
Pure standard air contain nitrogen, oxygen, noble gases, carbon dioxide, water; the true, normal air contain many other impurities.
Plasma.
A characteristic property is a chemical or physical property that helps identify and classify substances. The characteristic properties of a substance are always the same whether the sample you are observing is large or small.