0.5 g of zinc dissolved In dilute sulphuric acid gives 183cc of moist hydrogen at 9°C and 748mm . what would be the volume of gas at NTP? Calculate the weight of zinc required to liberate 22 .4 litres of dry hydrogen at NTP? (aqueous tension at 9°C =8.6 mm) [ans= 0.172 w 659)

in chemistry, adhesion and cohesion are attractive forces that exist between molecules. they hold the molecules together from each other. they are different in that adhesive force exists between molecules of different substance while cohesive force happens between molecules of same substance.

adhesion between water and glass causes water molecules at the edge of water and glass interface to climb up the wall in a narrow glass tube. this is called capillary action. cohesion is what gives glass its shape and causes water to form a droplet.

1. a)c-14 has two more protons

2. d)they have different numbers of protons, neutrons, and valence electrons; they are all gases at room temperature.

3. c) iron and nickel.

4d^55s^1 ( third choice)