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Dmitrij [34]
3 years ago
7

Pure cement can be used as a building material in theory, but the most common application of cement is as a binder that holds ot

her materials together. Concrete is made by adding water to a mixture of cement (the binder) and sand, pebbles, and gravel (the aggregate), which cures to form a solid structure. Which reasons could explain why concrete is used to make structures rather than pure cement?
Chemistry
1 answer:
IrinaVladis [17]3 years ago
7 0
Concrete is used to make structure rather than cement, because

It is cheaper
It produces a more durable structure
It cures more quickly
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Several constructive processes helped build mountains on Earth. All BUT one of these is a way mountains can be built. That is
ValentinkaMS [17]

C) landslides.

Explanation:

Landslides is not a way in which mountains are built on earth. It is a destructive process in nature that causes the slumping and wasting of land masses.

Landslide is a form of mass wasting and does no build masses.

Volcanoes helps to build mountains on the crust and this way, igneous rocks are formed.

Deposition process upbuilds to form sedimentary rocks.

Faulting is a can also be a constructive process that builds a mountain in the case of horsts and graben

learn more:

Sedimentary rocks brainly.com/question/9131992

#learnwithBrainly

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3 years ago
Hello how are u guys today?
Lyrx [107]

Answer:

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Explanation:

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3 years ago
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Valentin [98]

A) deposition is the processes where particles of rock or laid down in sections with heavier sediments building up first

5 0
3 years ago
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An atom of lead has a radius of and the average orbital speed of the electrons in it is about . Calculate the least possible unc
victus00 [196]

The question is incomplete. Here is the complete question.

An atom of lead has a radius of 154 pm and the average orbitalspeed of the electron in it is about 1.8x10^{8} m/s. Calculate the least possible uncertainty in a measurement of the speed of an electron in an atom of lead. Write your answer as a percentage of the average speed, and round it to significant 2 digits.

Answer: v% = 0.21 m/s

Explanation: To calculate the uncertainty, use <u>Heisenberg's Uncertainty Principle</u>, which states that:  ΔpΔx≥\frac{h}{4\pi }

where h is <u>Planck's constant</u> and it is equal to 6.626.10^{-34}m²kg/s.

Since p (momentum) is p = m.v:

mΔv.Δx ≥ \frac{h}{4\pi }

Δv = \frac{h}{4\pi.x.m }

Given that: r = x = 1.54.10^{-10}m and mass of an electron is m=9.1.10^{-31}kg

Δv = \frac{6.626.10^{-34} }{4.3.14.1.54.10^{-10}.9.1.10^{-31}}

Δv = 0.0376.10^{7}

As percentage of average speed:

Δv.\frac{1}{v}.100% = \frac{0.0376.10^{7} }{1.8.10^{8} }.10² = 0.021.10 = 0.21%

The least possible uncertainty in a speed of an electron is 0.21%.

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4 years ago
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