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kkurt [141]
3 years ago
14

Can someone help I’ll give s you BRAINLIST !!! I just need help in these question btw it’s science and 6th grade work plzz help

meeee

Chemistry
1 answer:
morpeh [17]3 years ago
3 0

Answer:

     More than 2,000 Years Ago, the Greek philosopher Aristotle suggested a model of the solar system. Aristotle's model was geocentric, or Earth-centered. In the model. the sun, stars, planets revolved around the Earth. In 150 AD an astrologer named Ptolemy began to support Aristotle's geocentric model.

    In 1543 AD, an astronomer named Copernicus proposed a heliocentric model of the solar system. In this model, the planets revolve around the sun. Due to the invention of the telescope, the solar system could be explored in more detail. Galileo used the telescope to support Copernicus's theory of the sun being the center of the universe.

    In the late 1500's, Kepler developed a law that explained planetary motion. Kepler's law is so accurate we still use them today.

Explanation:

Can you show me the rest of the question? I can not see it. Also, I know this is multiple choice fill in the blanks so I might be wrong. I hope that this helped though. This took a lot of research. The websites I used are commented down below. |

                                           \|/

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Romashka [77]

<u>Answer:</u> The nuclear fission reaction of U-234.043 is written below.

<u>Explanation:</u>

In a nuclear reaction, the total mass and total atomic number remains the same.

For the given fission reaction:

^{234.043}_{92}\textrm{U}\rightarrow ^{137.159}_{54}\textrm{Xe}+^{A}_{38}\textrm{Sr}+3^{1.0087}_0\textrm{n}+180MeV

<u>To calculate A:</u>

Total mass on reactant side = total mass on product side

234.043 = 137.159 + A + 3(1.0087)

A = 93.858

Now, the chemical equation becomes:

^{234.043}_{92}\textrm{U}\rightarrow ^{137.159}_{54}\textrm{Xe}+^{93.858}_{38}\textrm{Sr}+3^{1.0087}_0\textrm{n}+180MeV

Hence, the nuclear fission reaction of U-234.043 is written above.

7 0
3 years ago
A 23.7 g piece of iron at 54.9 C is cooled and releases 338 J of heat. The specific heat of iron is 0.450 J/gC. What is the fina
KonstantinChe [14]

Answer:

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Explanation:

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6 0
2 years ago
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A solution of ammonia and water contains 2.60×1025 water molecules and 6.90×1024 ammonia molecules. how many total hydrogen atom
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1 molecule of NH3 has 3 atoms of H.
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1 molecule H2O of has 2 atoms of H.
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2.07*10²⁵ + 5.20 *10²⁵ =7.27*10²⁵ atoms of H altogether.
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73 m is equal to 730 dm.

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The third reaction will form a gaseous product, CO₂
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3 years ago
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