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What is the chemical structure of an air fresher?
An air freshener is a mixture of many chemical substances, so there is no definitive chemical structure for an air freshener.
How do you think the stain changes the sample?
A stain is the result of an interaction between substances.
What substance physical properties depend on the composition?
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.
How many milliliters of nitrogen and oxygen are in a one liter sample of dry air?
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%.
Why is it not recommended to leave an oven-dried sample in the open air for a long time before measuring its dry weight?
Leaving an oven-dried sample in the open air for a long time can lead to reabsorption of moisture from the environment, leading to an increase in the sample's weight. This can result in inaccurate measurements of the sample's dry weight and affect the validity of the experiment's results.
How does a sample of feathers weigh more than a sample of other substances?
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.
What can be observed only when the substances in a sample of matter are changing into different substances?
chemical change
What are the two methods to cool down substances?
- place a sample in a refrigerator- place a sample in liquid nitrogen
When can chemical properties be observe?
chemical properties can be observed only when the substances in a sample of matter are changing into different substances
Sample of a hydrosphere?
air
What condition can chemical properties be observed?
Chemical Properties can be observed only when substances in a sample of matter are changing into different substances.
What is the chemical structure of an air fresher?
An air freshener is a mixture of many chemical substances, so there is no definitive chemical structure for an air freshener.
How do you think the stain changes the sample?
A stain is the result of an interaction between substances.
How many substances are present in air?
Pure standard air contain nitrogen, oxygen, noble gases, carbon dioxide, water; the true, normal air contain many other impurities.
What substances is less dense than air?
Plasma.
How does an air pump work?
An air sampling pump measures contaminants such as biological and environmental present in a sample of air. The sample of air is drawn into a tube which is attached to the pump. The air is vaporized and the particular contaminants presence is measured.
What substance physical properties depend on the composition?
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.
