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elixir [45]
3 years ago
6

A student conducts an experiment with a steel wool pad, which is comprised of iron. The student washes the steel wool in vinegar

and then leaves the wool out in the open air for 15 minutes. The student notices that the wool is changing color (turning brownish-orange) and when the student touches the steel wool, it feels warm to the touch.
Which of the follow changes occured during this experiment?
A. A physical changed occured and energy was given off
B. A chemical change occured and energy was given off
C. A chemical change occured and energy was absorbed.
D. A physical change occured and energy was absorbed
Chemistry
1 answer:
Ksju [112]3 years ago
3 0
B. A chemical change has occurred and energy was given off
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Answer:

1

Explanation:

For an ideal gas, the average kinetic energy is given by:

Ek = (3/2)*n*R*T

Where n is the number of moles, R is the gas constant (8.31 J/mol*K), and T the temperature. The gases have the same number of moles, and the same temperature, so they will have the same average kinetic energy:

Ek = (3/2)*1*8.31*300

Ek =3739.5 J

So, the ratio between then is 1.

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Answer:

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2 years ago
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coldgirl [10]
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3 years ago
The volume of 0.05 M H2SO4 is needed to completely neutralise 15ml of 0.1 M NaOH solution is
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V(NaOH)=15 mL =0.015 L
C(NaOH)=0.1 mol/L
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n(NaOH)=V(NaOH)C(NaOH)=2n(H₂SO₄)
n(H₂SO₄)=V(H₂SO₄)C(H₂SO₄)

V(NaOH)C(NaOH)=2V(H₂SO₄)C(H₂SO₄)

V(H₂SO₄)=V(NaOH)C(NaOH)/{2C(H₂SO₄)}

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5 0
3 years ago
Please help i need this as soon as possible
UNO [17]

Answer:

1. 1, 3, 2

2. 2, 2, 3

3. 2, 1, 2, 1

4. 2, 1, 2

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