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Reika [66]
3 years ago
5

Select the correct answer

Chemistry
1 answer:
amm18123 years ago
8 0

Answer:

  C  The experiment shows that the red substance experienced a chemical change.

Explanation:

Apparently, adding heat caused the red substance to decompose into a gas and a metallic liquid. If it were simply a phase change, the original red substance could be expected to return when the temperature cooled. Because the substance apparently decomposed, it is clearly not an element. At no point in the experiment is there any evidence of a plasma being formed.

The observed decomposition is a chemical change.

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Write a hypothesis that answers the lesson
steposvetlana [31]

Answer:

the reaction will come to a halt and the other reactant will still be present.

7 0
3 years ago
If an element has 11 protons and 11 neutrons in its nucleus it must be ?
Juliette [100K]

Answer:

the answer is 11

Explanation:

Ok, let us understand what is an atomic number, an atomic number is simply the proton number, the atomic number is always seen at the bottom left corner in a element of a periodic table, it is the number of proton in a atom of a certain element.

7 0
3 years ago
In the lab there is a vile of mercury and it has a mass of 43.0 grams. If the density of mercury is 13.6 g/mL, what is the volum
Vitek1552 [10]

Answer:

<h2>The answer is 3.16 mL</h2>

Explanation:

The volume of a substance when given the density and mass can be found by using the formula

volume =  \frac{mass}{density}

From the question

mass = 43 g

density = 13.6 g/mL

The volume is

volume =  \frac{43}{13.6}  \\   = 3.161764

We have the final answer as

<h3>3.16 mL</h3>

Hope this helps you

8 0
3 years ago
How many protons and electrons are there in a neutral atom of lithium<br> Np=Ne
pantera1 [17]

Answer:

3 protons and also 3 electrons

Explanation:

z=p=e

3 0
3 years ago
Is blowing up a balloon a chemical change
Anarel [89]

Answer:

Yes

Explanation:

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4 0
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