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3 years ago

Fractional crystallization recrystallizes mineral rocks in the reverse order they melted.

Chemistry

2 answers:

maksim [4K]3 years ago

7 0

False because it is not true at all

schepotkina [342]3 years ago

3 0

Answer: B

Explanation:

I think this is false. I really don't know the explination, but due to me just finishing this class. I'm going to go with B.

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Complete the table with the mass number, number of protons, number of neutrons, and number of electrons for the elements shown.

Alex

Answer:

Explanation:

The Proton number for flourine will be 9

Then the mass number which will be protons+ neutrons will be 19

Argon which has a mass number of 40

to find the proton number of argon it will be 40-22=18

then the electron number will just be the same as proton number

then calcium the proton will be the same as electron so it will be 20

then neutrons will be mass number -proton number

which is 21

hope this helped

and pretty cool you use a mac

6 0

3 years ago

¡que es el vitalismo ?

Brrunno [24]

<h2>Answer:</h2><h3>Vitalism-</h3>

A theory that an organic molecule cannot be produced from inorganic molecules, but instead can only be produced from a living organism or some part of a living organism. The theory was disproved in the early part of the 19th century<em>.</em>

<em>Translated</em><em>~</em>

Teoría de que una molécula orgánica no se puede producir a partir de moléculas inorgánicas, sino que solo se puede producir a partir de un organismo vivo o de alguna parte de un organismo vivo. La teoría fue refutada a principios del siglo XIX.

3 0

3 years ago

Describe one way in which advances in space technology have improved our understanding of objects in space.

Anika [276]

Answer:

Technology helps us in many ways.

Explanation:

We can now research the world even more effectively and at a higher level of sophistication thanks to technological advancements. Telescopes, on the other hand, enable us to peer into the far corners of the universe and detect very large objects such as stars. Electron microscope enable us to see smaller objects such as cells and organisms.

7 0

3 years ago

Predict the gravitational and electrostatic forces between molecules of gases? Provide evidence for your prediction.

zmey [24]

the electrostatic forces are $10^{36}$ larger than the gravitational force

Explanation:

Let's do the calculation by using two molecules of hydrogen, each containing 2 atoms of hydrogen.

The gravitational force between the two molecules is given by:

$F=\frac{G m_1 m_2}{r^2}$

where

$G=6.67\cdot 10^{-11} m^3 kg^{-1}s^{-2}$ is the gravitational constant

m1 and m2 are the masses of the two molecules: since they are identical,

$m_1 = m_2 = 2m_p = 1.67\cdot 10^{-27} kg$ , twice the mass of the proton

r is the distance between the two molecules

The force can be rewritten as

$F_G=\frac{Gm_p^2}{r^2}$

We can assume instead that electrostatic force between the two molecules is given by the interaction between the positively charged nuclei and the neatively charged electrons. Therefore,

$F_E=\frac{kq_1 q_2}{r^2}$