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hammer [34]
3 years ago
15

Sliver tarnishes physical or chemical change ?

Chemistry
2 answers:
elena55 [62]3 years ago
5 0

silver tarnishes is a chemical change

statuscvo [17]3 years ago
4 0
Chemical changes must involve a reaction. A hint that this is a chemical change is that there is a color change involved (from silver to black), and the tarnish can be removed without removing the unreacted silver.

Therefore, silver tarnishing would be a chemical change.

hope this helps!

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Suggest why some metals will react with hot water but not with cold water. Explain with one example. Draw figure.
Lelechka [254]

The difference in the reactivity of metals accounts for why some metals will react with hot water but not with cold water. For example, aluminum is less reactive than sodium and will only react with hot water but not cold water.

<h3>What is reactivity of metals?</h3>

The reactivity of metals is the ability of a metals to lose electrons.

The reactivity of metals generally decreases from left to right across the periodic table but increases on going down a group.

Due to the differences in reactivity of metals, some metals are more reactive than others.

For example, the reactive metals sodium, potassium and calcium react with cold water to with differing degree of spontaneity to liberate hydrogen.

Some other metal like aluminum, zinc, and  iron can only react with hot water or steam to liberate hydrogen.

Therefore, the reactivity of a metal will determine if it will react with cold water or hot water.

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5 0
1 year ago
What amount in moles does 242 L of carbon dioxide occupy at 1.32 atm and 20 degrees C
Gelneren [198K]

Answer:

13.28 mol.

Explanation:

  • We can use the general law of ideal gas:<em> PV = nRT.</em>

where, P is the pressure of the gas in atm (P = 1.32 atm).

V is the volume of the gas in L (V = 242.0 L).

n is the no. of moles of the gas in mol (n = ??? mol).

R is the general gas constant (R = 0.0821 L.atm/mol.K).

T is the temperature of the gas in K (T = 20.0° + 273 = 293.0 K).

∴ n = PV/RT = (1.32 atm)(242.0 L)/(0.0821 L.atm/mol.K)(293.0 K) = 13.28 mol.

7 0
4 years ago
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