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Why can?t snowballs be made in very cold weather ?
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Answer / guest
Due to regelation. To ?round? snowballs the hands apply
pressure which lowers the freezing point. Some of the snows
turns into water which refreezes as the pressure is
released. This makes a hard outercrust of ice to bind the
snowball together. In very cold weather, the hands cannot
apply sufficient pressure to do very cold weather, the hands
cannot apply sufficient pressure to do this.
| Is This Answer Correct ? | 33 Yes | 5 No |
Answer / lucy
Phenomenon in which water refreezes to ice after it has
been melted by pressure at a temperature below the normal
freezing point of water.
| Is This Answer Correct ? | 4 Yes | 14 No |
What is positive testing in relation to chemistry? For example, the sentence reads "Sample solutions are solutions known to contain one of each of the following ions, silver ion, Ag+(aq), barium ion, Ba2+(aq), and iron (III) ion, Fe3+(aq). Testing solutions are the solutions containing a polyatomic ion that can react with one of the metal ions to give a positive test." I am then asked to define what a "positive test" is. I am currently a student who is pretty new to chemistry, please try and make your answer as simply as possible. Thanks for the help.
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