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zysi [14]
3 years ago
9

Which of the following mountain ranges is the result of a continent-continent orogeny?

Chemistry
1 answer:
bija089 [108]3 years ago
5 0

Which of the following mountain ranges is the result of a continent-continent orogeny?

A) Andes Mountains

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A major component of gasoline is octane (C8H18). When octane is burned in air, it chemically reacts with oxygen gas (O2) to prod
Olin [163]

Answer:

The answer is 6.25g.

Explanation:

First create your balanced equation. This will give you the stoich ratios needed to answer the question:

2C8H18 + 25O2 → 16CO2 + 18H2O

Remember, we need to work in terms of NUMBERS, but the question gives us MASS. Therefore the next step is to convert the mass of O2 into moles of O2 by dividing by the molar mass:

7.72 g / 16 g/mol = 0.482 mol

Now we can use the stoich ratio from the equation to determine how many moles of H2O are produced:

x mol H2O / 0.482 mol O2 = 18 H2O / 25 O2

x = 0.347 mol H2O

The question wants the mass of water, so convert moles back into mass by multiplying by the molar mass of water:

0.347 mol x 18 g/mol = 6.25g

8 0
3 years ago
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Look closely at the valence electrons in all eight columns of your table from part C. Which element's location does not
maw [93]

Answer: helium(He)

Explanation: Helium has only 2 electrons in the outermost energy level, but all of the other elements in its column have eight.

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2 years ago
19) The nuclear symbol of helium,
Amiraneli [1.4K]

Answer:

Alpha particle

Explanation:

The helium symbol is also used to represent he alpha particles.

For example:

The americium with atomic wight  224 undergo alpha decay and produce

₉₃Np²³⁷ . The alpha particle emitted is also called helium nuclei. During this decay some gamma radiations also produce as a byproduct.

₉₅Am²²⁴   →    ₉₃Np²³⁷ + ₂He⁴

Properties of alpha radiation:

Alpha radiations are emitted as a result of radioactive decay. The atom emit the alpha particles consist of two proton and two neutrons. Which is also called helium nuclei. When atom undergoes the alpha emission the original atom convert into the atom having mass number 4 less than and atomic number 2 less than the starting atom.

Alpha radiations can travel in a short distance.

These radiations can not penetrate into the skin or clothes.

These radiations can be harmful for the human if these are inhaled.

These radiations can be stopped by a piece of paper.

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3 years ago
Why aren't ALL farms hydroponic?
marusya05 [52]

Answer:

Because all farms cant afford it... im not sure if this is the answer your lookin for but if it aint lmk and ill delete my answer

Explanation:

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Summary If you were a conservation scientist, what would you like most about your job?
hodyreva [135]

Explanation:

A conservationist is someone who advocates and champions the cause to protect the environment and use earth's resource in a sustainable way.

One of the interesting perks of being a conservationist is the ability to preserve pristine nature.

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