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It is a Physical Change.
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Mothballs disappear over time is it a chemical change?
No, mothballs disappearing over time is a physical change, not a chemical change. The mothballs are still the same substance, just dispersed or evaporated into the air.
Why do the mothballs in a clothes closet gradually disappear over time?
That is how they work: the insecticidal balls are made of para-dichlorobenzene (PDB, C6H4Cl2), an aromatic which will turn to vapor (sublime) at room temperature. The chemical is also used in urinal deodorizing cakes. Previously, mothballs had been made from the related chemical naphthalene, which has been identified as likely to be carcinogenic in humans.
Why do mothballs disappear EXPLAIN?
Mothballs contain a substance called naphthalene or paradichlorobenzene, which slowly evaporates when exposed to air. This process is known as sublimation, where a solid transforms directly into a gas without passing through the liquid phase. As the mothballs evaporate, they gradually disappear, leaving behind no residue or physical remnants.
Why do mothball disappear after a few weeks?
Mothballs contain a volatile chemical, typically naphthalene or paradichlorobenzene, which sublimates, turning from solid to gas. Over time, the concentration of these chemicals decreases as they evaporate into the air, leading to the mothballs disappearing. Additionally, environmental factors like temperature and airflow can accelerate this process. As the chemicals dissipate, their effectiveness in repelling pests diminishes.
Why mothballs turn small?
Mothballs turn small because they are made of a volatile chemical compound, such as naphthalene or paradichlorobenzene, that sublimes into a gas at room temperature. As the compound sublimes, it changes from a solid state directly to a gas, causing the mothballs to shrink over time.
Why do mothballs get smaller?
Mothballs get smaller over time primarily due to the sublimation of their active chemical compounds, such as naphthalene or paradichlorobenzene. These substances transition from a solid state directly into gas without becoming liquid, causing the mothballs to gradually shrink. Additionally, exposure to air and humidity can accelerate this process. As the mothballs evaporate, their effectiveness as a pest repellent diminishes.
What is an example of a chemical change that disappears?
One example of a chemical change that disappears is the formation of a complex between iron and cyanide ions to produce a deep blue color. However, over time, the complex can decompose and revert back to its original forms, causing the color to fade and the chemical change to disappear.
Is roasting meat over a campfire a physical or chemical change?
its an chemical change because roasting over a campfire the meat will be roasted so its chemical
Is a scab forming over a wound a physical or chemical change?
chemical
Is being resistant to corrosion a physical or chemical change?
Being resistant to corrosion is a physical property of a material, not a physical or chemical change. It means that the material does not undergo chemical reactions with its environment that would cause it to deteriorate over time.
The ability of a pond to freeze over in the winter is a?
chemical change
The ability of a pond to freeze over in winter is a?
chemical change
