Caesium, lithium potassium and sodium are all in Group of
the Periodic Table
(a) Place these metals in order of reactivity starting with the
most reactive.
(b) All Group 1 elements react in the same manner with
water.
(i) Name the chemical products of the reaction
between caesium and water.
(ii) Write a balanced chemical equation for the
reaction of caesium with water. Include state
symbols.
(iii) What three things would you expect to see if small
pieces of caesium were dropped in water in a glass
trough?
(C) What is the other name for Group 1 elements.

What is avogadro’s number, and why is it useful

Silver tarnishes as silver metal reacts with hydrogen sulfide, h2s, in the air. in this reaction, dark silver sulfide, au2s, covers the surface of silver. when silver is polished, this coating of silver sulfide can be removed from the surface. this makes the silver shiny again. enter the coefficients that balance the tarnishing reaction equation. (type 1 for no coefficient.)

Match the following vocabulary terms to their definitions. 1. amount of energy required to change 1 gram of material from the solid to the liquid state at its melting point 2. a measure of the kinetic energy of the particles of a substance 3. the amount of heat energy required to raise the temperature of 1 gram of liquid water from 14.5°c to 15.5°c 4. amount of energy required to change 1 gram of material from the liquid to the gaseous state at its boiling point 5. the amount of energy required to change 1 gram of a substance 1°c a. temperature b. latent heat of vaporization c. latent heat of fusion d. calorie e. specific heat