1) consider the following separation of materials. state weather a physical proc

ID: 2845623 • Letter: 1

Question

1) consider the following separation of materials. state weather a physical process or chemical reaction is involved in each separation?

a. sodium metal is obtained from the substance sodium chloride.

b.iron filings are separated from sand by using a magnet.

c.sugar crystals are separated from sugar syrub by evaporation of water.

d.iron is produced from iron ore that contains the substance iron (III) oxide.

e.copper is produced when zinc metal is placed in a solution of copper(ll) sulphate, a compound.

2) liquid nitrogen can be used for quick freezing of foods. the liquid boils at -196C.what is the temperature in degrees fahrenheit?

3) what is the mass of a 22.7ml sample of gasoline, which has a density of 0.70 g/cm^3?

4)give the condensed electronic configuration and the number of unpaired electrons for

a. cu^2+ b. co^3+

a) chemical process

b) physical process

c)physical process

d) chemical process

e)chemical process

2. degree Fahrenhiet = (degree celcius * 1.8) + 32

so, (-196 * 1.8) + 32 = -320.8 degree Fahrenhiet

3. mass = density * volume = 0.70 * 22.7= 15.89 g

4. a) Cu(2+): 1s2 2s2 2p6 3s2 3p6 4s2 3d7 Unpaired electron= 3
b)Co(3+): 1s2 2s2 2p6 3s2 3p6 4s2 3d1 Unpaired electron= 1

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