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umka21 [38]
3 years ago
7

Which of these defines a volcano?

Chemistry
2 answers:
dalvyx [7]3 years ago
7 0
The answer is b!!! !!!
Svetlanka [38]3 years ago
3 0

Answer:

B

Explanation:

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An atom of fluorine has an atomic number of 9 and an atomic mass of 19. The atom contains
muminat
The number of neutrons is the difference between the mass number and the number of protons. 

You get the element by looking at the atomic number which is the number of protons. In this case, it is 9 and yes, it is F. 

<span>However it is not an atom because it has 10 electrons so you have a fluoride ion F-. </span>

<span>The number of neutrons = 19 - 9 = 10

Therefore, the answer is D.

I hope my answer has come to your help. Thank you for posting your question here in Brainly. We hope to answer more of your questions and inquiries soon. Have a nice day ahead!
</span>
8 0
2 years ago
Which of the following is a physical model of the Sun? A. an equation that describes the Sun’s motion B. a chart that lists the
Bezzdna [24]

Answer:

It would be E. A small yellow ball that represents the Sun Reset Next i got the answer from somebody else

Explanation:

hope this helps :)

4 0
2 years ago
The concentration of copper(II) sulfate in one brand of soluble plant fertilizer is 0.070% by weight. If a 21.5 g sample of this
Semmy [17]

Answer:

The molar concentration of Cu^{2+} ions in the given amount of sample is 4.73\times 10^{-5}M

Explanation:

Given that,

Mass of sample = 21.5 g

0.07 % (m/m) of copper (II) sulfate in plant fertilizer

This means that, in 100 g of plant fertilizer, 0.07 g of copper (II) sulfate is present

So, in 20 g of plant fertilizer

,=\frac{0.07}{100}\times 21.5}\\=0.0151g of copper (II) sulfate is present.

To calculate the molarity of solution, we use the equation:

\text{Molarity of the solution}=\frac{\text{Mass of solute}}{\text{Molar mass of solute}\times \text{Volume of solution (in L)}}

Mass of solute (copper (II) sulfate) = 0.0151 g

Molar mass of copper (II) sulfate = 159.6 g/mol

Volume of solution = 2.0 L

\text{Molarity of solution}=\frac{0.0151g}{159.6g/mol\times 2.0L}\\\\\text{Molarity of solution}=4.73\times 10^{-5}M

The chemical equation for the ionization of copper (II) sulfate follows:

CuSO_4\rightarrow Cu^{2+}+SO_4^{2-}

1 mole of copper (II) sulfate produces 1 mole of copper (II) ions and sulfate ions

Molarity of copper (II) ions = 4.73\times 10^{-5}M

Hence, the molar concentration of Cu^{2+} ions in the given amount of sample is 4.73\times 10^{-5}M

4 0
3 years ago
Which substance is a homogeneous mixture?
AlladinOne [14]
An example of the substnce would be steel
8 0
3 years ago
Definition of chemical change
yuradex [85]

Answer:

Chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. These processes are called chemical reactions and, in general, are not reversible except by further chemical reactions.

Explanation:

8 0
2 years ago
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