Question

you take an ice cream out of the freezer, kept at -18°C. outside it is 32°C after one minute, the ice cream has warmed to -8°C what is the temperature of the ice cream after 5 minutes

Answer 1

15.6°C

Explanation:

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Answer 2

Answer:

An acid will react with a metal to form a salt and hydrogen gas. The general word equation for the reaction between an acid and a metal is as follows:

acid + metal → salt + hydrogen.

The reaction of an acid with a metal:-

diatomic

density

characteristic

presence

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Reaction of hydrogen and oxygen:-

The reaction between a tiny amount of hydrogen and oxygen in the air produces a characteristic 'pop' sound and this serves as test for the presence of hydrogen. You can watch the short video clip in the visit box in the margin to see this 'pop'.