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Hatshy [7]
3 years ago
15

The buildings in this old mine are made of metal. You can see over 100 years, the silver color of the buildings has changed. The

red-brown color is rust. What does this color change tell us about the metal? A) The metal is malleable. B) The metal reacts in the presence of air and water. C) Acid rain has damaged the building over the years. D) The metal is a good conductor of heat and electricity.
Chemistry
2 answers:
Anna11 [10]3 years ago
8 0

Answer:

The correct answer is option B.

Explanation:

4Fe(s)+3O_2(g)\rightarrow 2Fe_2O_3(s)

Iron in presence of moisture reacts with oxygen gas to from iron(III) oxide of red brown color often termed as rust.

Building material used up in min building is metal which which span of time changed its color to rust formation. Therefore this means rust or change in color is due to the iron metal which reacts with oxygen and water present in the air.

vladimir2022 [97]3 years ago
5 0
The correct answer is:  [<span>B]:  "The metal reacts in the presence of air and water." 
____________________________________________________________</span>
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3 years ago
What is an example of kinetic energy at work,1 a ball lodge in the tree, 1 a frisbee flaying in the air, 3 a car in the garage
AfilCa [17]

Answer:

a frisbee flaying in the air

Explanation:

Kinetic energy can be defined as an energy possessed by an object or body due to its motion.

Mathematically, kinetic energy is given by the formula;

K.E = \frac{1}{2}MV^{2}

Where;

  • K.E represents kinetic energy measured in Joules.
  • M represents mass measured in kilograms.
  • V represents velocity measured in metres per seconds square.

Hence, an example of kinetic energy at work is a frisbee flaying in the air because it would possess energy due to its motion in the air.

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2 years ago
The density of benzene at 15 °c is 0.8787 g/ml. Calculate the mass of 0.1500 l of benzene at this temperature. Enter your answer
Otrada [13]

Answer:

131.8 g.

Explanation:

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<u><em>d = m / V.</em></u>

d = 0.8787 g/ml.

V = 0.15 L x 1000 = 150 ml.

  • ∴ the mass of 0.15 L of benzene = d x V = (0.8787 g/ml) (150 ml) = 131.8 g.
5 0
3 years ago
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ludmilkaskok [199]
<h2>Answer:  # of neutrons = 9</h2>

<h3>Explanation:</h3>

# of neutrons = mass number - atomic number

                      = 17 - 8

                      = 9

<h3>∴ number of neutrons in an atom of oxygen of mass number 17, is 9.</h3>
3 0
2 years ago
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Natalija [7]

Hi the answer is 1/6, because 1/6 of 3,600 is 600, so it's 1/6. Have a great day!


7 0
3 years ago
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