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3 years ago

5

suppose you find a website that describes rusting of a nail as a change to only the physical properties of iron. would it be acc

urate

1 answer:

Kaylis [27]3 years ago

5 0

Answer:

The website is inaccurate.

Explanation:

Remember, a chemical change is characterized by many things, but most commonly:

A change in color, temperature or state.
An irreversible change
One or more new substances are formed

Rusting (Iron oxide) is a redox reaction (Oxidation-Reduction Reaction) where iron molecules come in contact with water and oxygen molecules. The iron molecules lose electrons, becoming oxidized, while oxygen gains electrons, becoming reduced.

Is rust reversable? (No)

Did the colour of the iron on the surface change? (Yes)

Did a new substance form? (Yes, Read above).

Hope I helped! Have a good day!

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Which of the following DOES NOT belong to the group?

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Answer:

eyes

Explanation:

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A solution is prepared by dissolving 318.6 g sucrose (C12H22O11) in 4905 g of water. Determine the molarity of the solution

alexandr1967 [171]

The molarity of sucrose solution is 0.19 M.

The molarity of HCl is 12.8 M.

<u>Explanation:</u>

a. Molarity can be found by finding its moles and volume of water in L and then dividing both(moles divided by volume in Litres).

Mass of sucrose = 318. 6 g

Molar mass of sucrose = 342.3 g/mol

Moles = $$\frac{mass}{molar mass}$

= $$\frac{318.6 g}{342.3 g/mol}$

= 0.93 moles

Mass of water = 4905 g

Density of water = 1000 g/L

Volume = $$\frac{mass}{density}$

= $$\frac{4905 g }{1000 g/L}$

= 4.905 L

Now we can find the molarity = $$\frac{moles}{Volume(L)}$

= $$\frac{0.93 moles}{4.905 L}$

= 0.19 M

So the molarity of sucrose solution is 0.19 M.

b. The molarity of HCl can be found as follows.

It is given that 39% HCl that means it contains 39 g of acid in 100 g of water.

Density of the solution is 1.20 g/mL, from this mass can be found as,

$$\frac{1 L \times 1000 mL \times 1.20 g}{1 L \times 1 mL}$

= 1200 g

Now we have to find out the amount of HCl in grams as,

$$\frac{1200g \times 39 g HCl }{100 g solution}$

= 468 g HCl

Now we have to find the number of moles,

moles = $$\frac{468 g}{36.46 g/mol}$

= 12.8 moles

Molarity of HCl = $$\frac{12.8 moles}{1 L }$

= 12.8 M

So the molarity of HCl is 12.8 M.

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3 years ago

When 0.1M HCl is added to the following system at equilibrium: AgCl(s) Ag+ (aq)+ Cl– (aq) the point of equilibrium will shift to

hichkok12 [17]

Le Chatelier's Principle says that when something disrupts the equilibrium, the system adjusts to minimize the effect of that disturbance. If 0.1 M HCl solution is added, this dissociates into H+ and Cl- ions, so there will be more Cl- ions in the system. This causes the reaction to go in the reverse direction (equilibrium shifts to the left) to reduce the amount of Cl-.
Since this also consumes Ag+ ions, the concentration of Ag+ (aq) will decrease.
The answer is the second choice.

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1. Metallic strontium crystallizes in a face-centered cubic lattice, with one Sr atom per lattice point. If the edge length of t

Zarrin [17]

Answer:

$r=215pm$

$N_{Mn}=20$

Explanation:

From the question we are told that:

Edge length of the unit cell $l=608pm$

a)

Generally the equation for The relationship between edge length and radius is mathematically given by

$4r=\sqrt{2a}$

Therefore

$4r=\sqrt{2*608}$

$r=\frac{\sqrt{2*608}}{4}$

$r=215pm$

b)

From the question we are told that:

Density $\rho=7.297$

Edge length of $l=630.0 pm=>630*10^-{10}$

Therefore Volume is given as

$V=l^3$

$V=630*10^-{10}^3$

$V=2.50047*10^{−22}$

Generally the equation for Mass is mathematically given by

$m=Volume*density$

$m=V*\rho$

$m=2.50047*10^{−22}*7.297$

$m=1.83*10^{-21}g$

Therefore Molarity is given as

$n=\frac{M}{Molar M}$

$n=\frac{1.83*10^{-21}g}{55}$

$n=3.32*10^{-23}$

Finally The atoms in a unit cell is

$N_{Mn}=Moles*Avogadro\ constant$

$N_{Mn}=3.32*10^{-23}*6.023*10^{23}$

$N_{Mn}=20$

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