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dimulka [17.4K]
3 years ago
12

What is an example of a physical change involving iron and a chemical change involving iron?

Chemistry
2 answers:
Vikentia [17]3 years ago
6 0
Chemical change: is any change the results formation of new chemical substances Physical changes: rearranged molecules but affect internal structures
Sunny_sXe [5.5K]3 years ago
6 0
The chemical change of iron would be iron rusting because it a chemical change. Explain it ahah i gotcha its chemical because iron will react to oxygen and for rust which is a new substance.
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Answer:

A

Explanation:

Iron has the ground state electronic configuration [Ar]3d64s2

Fe2+ has the electronic configuration [Ar]3d6.

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Which electromagnet would have the most strength?
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The one with 20 coils as it can generate more electricity. 
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Answer:

<h2><em>B</em></h2>

Explanation:

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Which of the following characteristics could an animal possess?
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7. How many moles of argon are there in 20.0 L, at 25 degrees Celsius and 96.8 kPa?
suter [353]
<h3>Answer:</h3>

              0.8133 mol

<h3>Solution:</h3>

Data Given:

                 Moles  =  n  =  ??

                 Temperature  =  T  =  25 °C + 273.15  =  298.15 K

                  Pressure  =  P  =  96.8 kPa  =  0.955 atm

                  Volume  =  V  =  20.0 L

Formula Used:

Let's assume that the Argon gas is acting as an Ideal gas, then according to Ideal Gas Equation,

                  P V  =  n R T

where;  R  =  Universal Gas Constant  =  0.082057 atm.L.mol⁻¹.K⁻¹

Solving Equation for n,

                  n  =  P V / R T

Putting Values,

                  n  =  (0.955 atm × 20.0 L) ÷ (0.082057 atm.L.mol⁻¹.K⁻¹ × 298.15 K)

                 n  =  0.8133 mol

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3 years ago
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