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Lowering the temperature using a fridge slows down chemical reactions by reducing the kinetic energy of the molecules. This decreases the rate of reaction, making it take longer to reach completion. In some cases, extreme cooling can even stop the reaction altogether.
Bananas turn black in the refrigerator mainly because of the chemical reactions in their peel.
A non-ripe green banana peel contains a plant hormone called ethylene. This gaseous chemical is responsible for helping ripen the banana to yellow color. At the same time, some natural acids are also being produced which regulate the ripening process and make the banana sweet (inside the banana, the large number of enzymes of Kreb's cycle convert citric acid, mallic acid and oxalic acid into glucose, which turn the banana sweet during the process of ripening).
When someone puts a banana in the fridge, the production of these natural acids slows down as consequence of the cold temperature and, as a result, the ripening process of its interior slows down.
However, in cold temperatures, the physical state of cell membranes in the banana peel changes causing leakage of the enzyme polyphenoloxidase which oxidize phenolic compounds that leak from the vacuoles of the cells ( this enzyme polymerises them into polyphenols similar in structure to the melanin formed in suntanned human skin), and hence producing the dark colour.
Nonetheless, bananas can be stored in the refrigerator for few days. Despite the peel of banana becoming dark, its content will remain firm and delicious. Coating the banana with organic wax to prevent contact with the oxygen of the air can also slow down the blackening of the skin.
Another solution is to peel the bananas beforehand, put them in a sealed freezer bag and then storing them in the fridge. Coating them with little bit of fresh lemon juice can help to reduce its darkening process even more.
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Is a fridge door going rusty a chemical or physical change?
The rusting of a fridge door is a chemical change because it involves a reaction between the iron in the door and oxygen in the air to form iron oxide (rust). This process is irreversible and alters the chemical composition of the metal.
What happens to a balloon's pressure when put into the fridge?
it dies
Why store DNA in refrigerator until testing?
Storing DNA in a refrigerator helps to preserve its integrity and prevent degradation. Keeping DNA samples at a lower temperature can slow down enzymatic reactions and minimize the risk of contamination, ensuring the accuracy of any subsequent testing.
Why controlling reaction rates are important to your daily life?
Rate of reactions are used in many things in daily life. For example; - Enzymes: Enzymes are biological catalysts (substances with increase the rate of reactions). They quicken the rate at which food is broken down. - Washing Clothes: Temperature affects the rate of reactions. The higher the temperature the quicker the particles move. If they move quicker there is a bigger chance that they will collide (search the collision theory). This is why the temperature at which clothes are washed is important. There are enzymes in washing powder. They work well at a certain temperature, but when the temperature gets too hot, they do not work. The proteins that make up the enzyme are "denatured". (search how enzymes work) - Fridges Again, at a lower temperature the rate of reaction is less. So in a fridge reactions happen slower so foods rot slower (as rotting is also a chemical reaction) Hope this helps! I looked on the internet for this question too, but it doesn't help. I found these answers in the Chemistry for You book by Lawrie Ryan. They're really useful.
What happens when a sample of water turns into ice?
it will froze and if you leave i like that and if you don't put in in the fridge it will melt
Can you have an allergic reaction to eating water chestnuts stored in can in fridge?
If it's really an allergic reaction, it wouldn't matter if they were stored in the fridge. Just the food would cause the reaction. It's not a good idea to store anything in an opened can. The metal in the can causes reactions with some foods when air is introduced and it's possible that some of the reactions are toxic. If you have left over food from a can, transfer it to glass or plastic for storage.
Would putting epoxy resin in the refrigerator affect it's rate of curing?
Yes, indeed. Epoxy resin cures by chemical reaction. Any chemical reaction is speeded up when you heat it, but when you cool it in the fridge, the reaction slows way down!
What are real life examples of enthalpy?
Burning of natural gas, evaporation of water, and formation of bonds in chemical reactions are all examples of processes that involve enthalpy changes.
Is a fridge door going rusty a chemical or physical change?
The rusting of a fridge door is a chemical change because it involves a reaction between the iron in the door and oxygen in the air to form iron oxide (rust). This process is irreversible and alters the chemical composition of the metal.
What happens if you put your xbox in the fridge?
It will kill it.
What happens to refrigerated crusha?
What happens if I drink CRUSHA without putting it in the fridge
When does a chemical reaction take place?
A chemical reaction occurs when the conditions for a chemical reaction exist. Which is a really lame answer, so let's play with it. You want to make some water and carbon dioxide. You have some hexane, which is C6H14. If you set the hexane on fire, it will react with the oxygen in the air to produce carbon dioxide and water.
What happens when we left thermometer in the fridge?
Nothing will happen, except the thermometer will show the fridge's interior temperature.
What happens to a balloon's pressure when put into the fridge?
it dies
When a fridge door goes rusty you can tell it is a chemical change because?
The fridge reacts with oxygen in the air, therefore creating rust. An example of a chemical property is ability to react with oxygen.
Why store DNA in refrigerator until testing?
Storing DNA in a refrigerator helps to preserve its integrity and prevent degradation. Keeping DNA samples at a lower temperature can slow down enzymatic reactions and minimize the risk of contamination, ensuring the accuracy of any subsequent testing.
Why controlling reaction rates are important to your daily life?
Rate of reactions are used in many things in daily life. For example; - Enzymes: Enzymes are biological catalysts (substances with increase the rate of reactions). They quicken the rate at which food is broken down. - Washing Clothes: Temperature affects the rate of reactions. The higher the temperature the quicker the particles move. If they move quicker there is a bigger chance that they will collide (search the collision theory). This is why the temperature at which clothes are washed is important. There are enzymes in washing powder. They work well at a certain temperature, but when the temperature gets too hot, they do not work. The proteins that make up the enzyme are "denatured". (search how enzymes work) - Fridges Again, at a lower temperature the rate of reaction is less. So in a fridge reactions happen slower so foods rot slower (as rotting is also a chemical reaction) Hope this helps! I looked on the internet for this question too, but it doesn't help. I found these answers in the Chemistry for You book by Lawrie Ryan. They're really useful.
