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musickatia [10]
3 years ago
8

Helppppp I need it ASAP

Chemistry
1 answer:
tino4ka555 [31]3 years ago
3 0
Question 6
a) B
b) A

Question 7
a) Iron
b) oxygen, water
c) i) Galvanizing
ii) Painting
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you are given mixtures containin gthe following compounds. Which compound in each pair could be separated by stirring the solid
ExtremeBDS [4]

Answer:

(A) NaOH and Ca(OH)2: Ca(OH)2

(B) MgCl2 and MgF2: MgF2

(C) Agl and KI: AgI

(D) NH4Cl and PbCl2: PbCl2

Explanation:

We need to see the solubility in water, at similar temperatures, for each compound and see which one is less soluble than the other:

NaOH: 1000 g/L (25 °C)

Ca(OH)2: 1.73 g/L (20 °C)

MgCl2: 54.3 g/100 mL (20 °C)

MgF2: 0.013 g/100 mL (20 °C)

Agl: 3×10−7g/100mL (20 °C)

KI: 140 g/100mL (20 °C)

NH4Cl: 383.0 g/L (25 °C)

PbCl2: 10.8 g/L (20 °C)

After the comparison made we can conclude that the less soluble, after saturation of water, will precipitate first.

3 0
4 years ago
So i like this guy and don't know if he will like me i'm the one who has brown hair
Rasek [7]

Answer:

GUUUUUUUUURLLLLLL HAVE CONFIDENCE YOU GO QUEEN PERIODT

Explanation:

3 0
3 years ago
Why is hydrogen placed in group one of the<br> periodic table?
Mice21 [21]

Answer:

Hydrogen has only 1 valence electron in its outermost shell.

Explanation:

6 0
4 years ago
An iron nail rusts when exposed to oxygen. According to the following reaction, how many moles of iron(III) oxide will be formed
Zigmanuir [339]

Answer:

0.453 moles

Explanation:

The balanced equation for the reaction is:

2Fe(s) + 3O2(g)  ==>  2Fe2O3

From the equation,  mass of O2 involved = 16 x 2 x 3 = 96g

                                 mass of Fe2O3 involved = [(2x26) + 3 x 16] x 2

                                                                            = 100g

                Therefore 96g of O2 produced 100g of Fe2O3

                                  32.2g of O2 Will produce   100x32.2/96

                                                   = 33.54g of Fe2O3

Converting it to mole using   number of mole = mass/molar mass

but molar mass of Fe2O3 = 26 + (16 X 3)

                                           = 74g/mole

Therefore number of mole of 33.54g of Fe2O3 = 33.54/74

                                                                           = 0.453 moles

5 0
3 years ago
Ocean's, glaciers, lakes, and rivers are part of earth's
AVprozaik [17]
<span>Ocean's, glaciers, lakes, and rivers are part of earth's hemisphere</span>
7 0
3 years ago
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