Do substances have to be cold to freeze?

2 answers:

6 0

No because anything can freeze but the warmer it is the longer it will take to be fully frozen. If you want the substance to freeze faster have it be cold by putting it in the fridge or something.

Zinaida [17]3 years ago

4 0

Answer:

No.

Explanation:

90% of the time when someone hears the word "freeze", they think cold.

However, at its core, to freeze, is to become solid, and there are many solid materials that aren't necessarily cold, for instance Lava is hot, and once it cools it becomes a form of rock that is not necessarily cold, however it has frozen into a solidified form.

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Elements are pure substances made up of _____.

mel-nik [20]

Elements are pure substances made up of molecules

3 0

3 years ago

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Americium-241 is an alpha emitter used in household smoke detectors and K-40 is a positron emitter used to date rock samples. Th

VMariaS [17]

Answer:

Np-237, Ar-40.

Explanation:

Alpha particle is positively charged particle having a mass of 4 unit. Hence,when alpha is removed from any isotope it produces a element having mass 4 units less than original isotope that was before emission. Americium 241 isotopes used in the smoke detector which emit an alpha particle to produce neptunium-237.

Potassium-40 emits positron which is having negative charge to lower one proton and increase one neutron number in the particle and in such way it will produce $^{40}Ar_{18}$ not $^{40}Ca_{20}$