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satela [25.4K]
3 years ago
8

Can anyone explain why the mongols invaded russia?

Chemistry
2 answers:
Gelneren [198K]3 years ago
7 0

Answer:

It all started when Genghis Khan (1155-1227), the founder of the Mongol Empire, sent his son Jochi (1182-1227) to conquer the lands of what is now Siberia, Central Russia, and Eastern Europe. Giant armies of Mongol warriors (clearly over 100,000, an enormous number in the 13th century) easily defeated the weak and ill-numbered forces of the Russian princes, who were at war with each other before the invasion.

In 1237, the Mongols, led by Batu Khan, invaded Rus’. They took, ravaged and burned Ryazan’, Kolomna, Moscow, Vladimir, Tver – all the main Russian cities. The invasion continued until 1242 and was a terrible blow for the Russian lands – it took almost 100 years to fully recover from the damage the Mongol army did. Also, the lands and cities of the South – Kiev, Chernigov, Halych were burned to the ground. The North-Eastern lands, most notably Tver, Moscow, Vladimir, and Suzdal became the main cities after the invasion.

However, the Mongols didn’t want to conquer the land fully – they just wanted stable tributes. And they knew how to get what they wanted.

Explanation:

Svetach [21]3 years ago
5 0

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When cream mixes with coffee, is this a chemical or physical change?
svlad2 [7]

It is a physical change when cream mixes with coffee, it changes the color of the coffee. When you add more or less cream there is a color change depending on the consistency of cream. The properties are not changes and a no new compound is formed as in chemical change with a reaction of two compounds, a new compound is formed with different properties. So it is a physical change.

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3 years ago
Calculate the number of grams of CO that can react with 0.400 kg of Fe2O3.
aleksandr82 [10.1K]

Answer:

mass of CO = 210.42 g

mass in three significant figures = 210. g

Explanation:

Given data:

mass of Fe2O3 = 0.400 Kg

mass of CO= ?

Solution:

chemical equation:

Fe2O3 + 3CO → 2Fe + 3CO2

Now we will calculate the molar mass of  Fe2O3 and CO.

Molar mass of  Fe2O3 = (55.845 × 2) + (16 × 3) = 159.69 g/mol

Molar mass of CO = 12+ 16 = 28 g/mol

now we will convert the kg of Fe2O3 in g.

mass of Fe2O3 = 0.400 kg × 1000 = 400 g

number of moles of Fe2O3  = 400 g/ 159.69 g/mol = 2.505 mol

mass of CO = moles of Fe2O3 × 3( molar mass of CO)

mass of CO = 2.505 mol × 84 g/mol

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5 0
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When you are done using the glassware from a kit, what should you do?
lakkis [162]

Answer:

A. Wipe down the glassware to remove any cleaning solvent.

Explanation:

· Remove stoppers and stopcocks when they are not in use. Otherwise, they may "freeze" in place. You can de-grease ground glass joints by wiping them with a lint-free towel soaked with ether or acetone. Wear gloves and avoid breathing the fumes. The deionized water rinse should form a smooth sheet when poured through clean glassware.

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umka21 [38]

Answer:

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Explanation:

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The condensed electronic configuration is given as;

[Ar] 4s²

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3 years ago
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