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Savatey [412]
3 years ago
10

Summarize the main contributions of copernicus, brahe,kepler,galileo,and newton

Chemistry
1 answer:
Ilia_Sergeevich [38]3 years ago
3 0
Copernicus- developed heliocentric model, discovered the chemical element Copernicum has the symbol Cn and atomic number 112, started the scientific revolution.

Brahe- known for his precise and comprehensive astronomical and planetary observations, which heavily influenced future discoveries; built the maps of Hven that helps in accurate determinations of latitude and longitude.

Kepler - solved the mystery of the planets; believed the Solar System's planets orbited the sun in circular path that determined by an arrangement of the five platonic solids.

Galileo - Father of Modern Science; discovered the first moons ever known to orbit a planet other than Earth; first person to study the sky with a telescope; discovered the rings of Saturn; our moon has mountains; Milky Way is made up of stars; established that everything falls to the ground at the same rate regardless of weight; identified the parabola; proposed theory of relativity; discovered pendulums; tried to measure the speed of light; showed the set of perfect squares.

Newton- generalized the binomial theorem; showed sunlight is made up of all the colors of the rainbow; discovered the law of gravitation; Laws of motion and calculus.
       


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What is the total number of electrons in the valence shell of an atom of aluminum in the ground state?
artcher [175]
The answer is (3) 3. The outer shell of an atom is called valence shell. And the ground state is the lowest energy state of an atom. Aluminum has a electron distribution of 2, 8, 3. So the outer shell has 3 electrons.
5 0
3 years ago
Read 2 more answers
What is the mole fraction of NaOH in an aqueous solution that
astraxan [27]

Answer:

The mole fraction of NaOH in an aqueous solution that contain 22.9% NaOH by mass=0.882

Explanation:

We are given that

Aqueous solution that contains 22.9% NaOH by mass means

22.9 g NaOH in 100 g solution.

Mass of NaOH(WB)=22.9 g

Mass of water =100-22.9=77.1

Na=23

O=16

H=1.01

Molar mass of NaOH(MB)=23+16+1.01=40.01

Number of moles =\frac{Given\;mass}{Molar\;mass}

Using the formula

Number of moles of  NaOH(n_B)=\frac{W_B}{M_B}=\frac{22.9}{40.01}

n_B=0.572moles

Molar mass of water=16+2(1.01)=18.02g

Number of moles of water(n_A)=\frac{77.1}{18.02}

n_A=4.279 moles

Now, mole fraction of NaOH

=\frac{n_B}{n_B+n_A}

=\frac{4.279}{0.572+4.279}

=0.882

Hence, the mole fraction of NaOH in an aqueous solution that contain 22.9% NaOH by mass=0.882

4 0
3 years ago
A 1.0-L buffer solution is 0.10 M in HF and 0.050 M in NaF. Which action destroys the buffer? (a) adding 0.050 mol of HCl (b) ad
Volgvan

Answer:

(a) adding 0.050 mol of HCl

Explanation:

A buffer is defined as the mixture of a weak acid and its conjugate base -or vice versa-.

In the buffer:

1.0L × (0.10 mol / L) = 0.10 moles of HF -<em>Weak acid-</em>

1.0L × (0.050 mol / L) = 0.050 moles of NaF -<em>Conjugate base-</em>

-The weak acid reacts with bases as NaOH and the conjugate base reacts with acids as HCl-

Thus:

<em>(a) adding 0.050 mol of HCl:</em> The addition of 0.050moles of HCl produce the reaction of 0.050 moles of NaF producing HF. That means after the reaction, all NaF is consumed and you will have in solution just the weak acid <em>destroying the buffer</em>.

(b) adding 0.050 mol of NaOH: The NaOH reacts with HF producing more NaF. Would be consumed just 0.050 moles of HF -remaining 0.050 moles of HF-. Thus, the buffer <em>wouldn't be destroyed</em>.

(c) adding 0.050 mol of NaF: The addition of conjugate base <em>doesn't destroy the buffer</em>

3 0
3 years ago
Ve. In what layer do weather balloons fly?<br><br> Earth layers
galben [10]

Answer:

stratosphere

Explanation:

6 0
2 years ago
7m-11=10 como se acomoda pls ayuda​
Reptile [31]

Answer:

3

Explanation:

7m-11=10

quitar 11 de ambos lados

7m -11+11 = 10+11

7m=21

7/7m=21/7

m=3

3 0
3 years ago
Read 2 more answers
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