Write true or false next to each of these statements. 2.
a All metals are magnetic.
b Solid non-metals are brittle.
(All metals are solids.
d Metals conduct heat energy.
..
e Non-metals are good conductors of electricity.
mata

a) False ( all metals are not magnetic for ex - gold is not magnetic )

b) false ( Diamond is a solid non metal still it shine)

c ) False ( mercury metal is liquid at room temperature)

d) True

e) False (Non metals are bad conductor of heat and electricity )

the old alchemists made significant contributions to science even though there starting premises were off a bit. their conclusions after failure would steer them into better directions for investigation. science is no more than close observation and the initial mistakes result in rethinking and retrying experiments.

1. for the first question, we must find the mass of the anhydrous salt, mgso₄. the molar mass for mgso₄·7h₂o is 246.47 g/mol, while that of mgso₄ is 120.37 g/mol.7.834 g mgso₄·7h₂o * 1 mol mgso₄·7h₂o/246.47 g * 1 mol mgso₄/1 mol mgso₄·7h₂o * 20.37 g mgso₄/mol = 0.647 g mgso₄

2. mass of water = mass of sample - mass of anhydrous salemass of water = 7.834 - 0.647 = 7.19 gpercent water in hydrate = 7.19/7.834 * 100 = 91.74%