Name the gas released when group 1 elements react with water.

Hydrogen

Explanation:

HYDROGEN GAS

Explanation:

#All the alkali metals react vigorously with cold water.

#In each reaction, hydrogen gas is given off and the metal hydroxide is produced.

#The speed and violence of the reaction increases as you go down the group.

#This shows that the reactivity of the alkali metals increases as you go down Group 1.

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which statement about this sum is true? −245+2.7

hello, i am papaguy.

i have found an answer to your question but use it as information.

information: because weak acids/bases have low concentration of hydrogen ions, the addition of water has a large impact on the ph. 2. a difference in 1 unit is a 10x difference in concentration for example; a liquid with ph of 3 is 10x more acidic than a liquid with a ph of 4. therefore, a liquid with a ph of 3 is stronger.

best of luck!