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Levart [38]
3 years ago
9

Why are scientists interested in exploring Mars? A. possible existence of sulfur vents B. possibility of mining minerals C. poss

ible discovery of a cure for disease D. possible evidence of life
Chemistry
2 answers:
Marina CMI [18]3 years ago
5 0
<span> B. possibility of mining minerals</span>
Troyanec [42]3 years ago
4 0
D to find existence of life
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If an atom of an element has a mass number of 45 and it has 20 neutrons in its nucleus, what is the atomic number of the
HACTEHA [7]

Answer:

Explanation:

uestion

If an atom of an element has a mass number of 45 and it has 20 neutrons in its nucleus, what is the atomic number of the

element?

3 0
4 years ago
PLEASE HELP FOR THIS ASSIGNMENT
mars1129 [50]
<h2>Steps:</h2>
  • Remember that Density = mass/volume, or D = m/v

So firstly, we have to find the volume of the rock. To do this, we need to subtract the volume of water A from the volume of the water B. In this case:

  • Water A = 30 mL
  • Water B = 40 mL
  • 40 mL - 30 mL = 10 mL

<u>The volume of the rock is 10 mL.</u>

Now that we have the volume, we can plug that and the density of the rock into the density equation to solve for the mass.

3.678=\frac{m}{10}

For this, multiply both sides by 10:

36.78=m

<h2>Answer:</h2>

<u>Rounding to the tenths place, the mass of the rock is 36.8 g, or C.</u>

6 0
4 years ago
How many grams are there in 9.4x10^25 molecules of H2
Arisa [49]

Answer:

You start with 9.4 x 1025 molecules of H2.

You know that an Avogadro's number of molecules of H2 has a mass of 2.0 g.

To solve, 9.4 x 1025 molecules H2 x (2.0 g H2 / 6.023 x 1023 molecules H2) = 312. g H2

Explanation:

7 0
3 years ago
The characteristics of metallic bonds fit nicley into a predictable pattern. True or False?​
Nataly_w [17]

Answer:

True

Explanation:

DON'T GIVE BRAINLIEST TO THE FILE EXPLOITER!!!!

7 0
3 years ago
in the structure of an atom why are protons present in the centre and are not pulled outside by the electrons as both are positi
Maurinko [17]

Answer:

Electrons and protons are not positively charged

Explanation:

Neutrons are the only ones positively charged in the structure of an atom.... Also like charges repel which means a -ive and a - ive will repel when together

8 0
3 years ago
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