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Olenka [21]
3 years ago
12

An area has experienced weathering and erosion for many years. Over time, some rock formations have been left behind forming pea

ks and columns. What is a reasonable conclusion to draw?
A. The rock that has been carried away over time is very hard and resistant to weathering and erosion.
B. The peaks and columns are made of rock that are very easily weathered and eroded.
C. Humans have protected the peaks and columns over time.
D. The peaks and columns are made of rock that are resistant to weathering and erosion.
Chemistry
1 answer:
Anni [7]3 years ago
6 0

Answer:

D.

Explanation:

The rock that is left behind is there because it has resisted the forces of erosion.

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If you throw a ball into the air, the force of ________ makes the ball fall back toward Earth.
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Each chemical element has an atomic number and a mass number. the atomic number refers to the number of ___________________the e
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5 0
3 years ago
A mixture of C3H8 and C2H2 has a mass of 2.8 g. It is burned in excess O2 to form a mixture of water and carbon dioxide that con
astraxan [27]

Answer:

The mass of C2H2 in the mixture is 0.56gram using the ratio of carbon in the products contributed by the C2H2.

Explanation:

The balanced equation for the reaction is: C3H8 + 2C2H2 + 10O2 >> 7CO2 + 6H2O.

From the reaction, we know that the oxygen was in excess, this will make the Carbon sources the limiting agents in the reaction. The details of the reaction showed that the ratio of water to the carbon dioxide is 1.6:1. This also means that the expected mole of carbon dioxide will be 7/1.6, which is 3.75moles.

The individual balanced equation of reaction is:

C3H3 +5O2 >> 3CO2 + 4H2O

and 2C2H2 + 5O2 >>4CO2 + 2H2O. From this one can quickly tell that the propane is in sufficient supply as it produces 3 moles of CO2 out of the expected 3.75 moles obtained above. Leaving 0.75moles of CO2 to the ethyne.

The mass of ethyne in the mixture will therefore be: 0.75/3.75 X 2.8 = 0.56g.

4 0
3 years ago
What is the difference between a quantity and a unit?
Irina-Kira [14]

Question

What is the difference between a quantity and a unit?

Answer:

Physical quantities are a characteristic or property of an object that can be measured or calculated from other measurements. Units are standards for expressing and comparing the measurement of physical quantities. All units can be expressed as combinations of four fundamental units.

Hope this helps!!!

xXxAnimexXx

4 0
3 years ago
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