Elements are the chemical species which cannot be damaged down and have very same number of proloads.




You are watching: Which of the following definitions characterizes an element?



A student obtains a sample of liquid bromine at 20 levels Celsius. She steps the volume to be 25.0cm³ and she looks up the d

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0.485 moles of Br₂ are in the sample

Explanation:

Density is a physic continuous. It is particular to each substance or compound and also as an extensive building, it varies via temperature

Density = Mass / Volume

Density of Br₂ = Mass of Br₂ / Volume of Br₂

Therefore, Mass of Br₂ = Density of Br₂ . Volume of Br₂

Mass of Br₂ = 3.1 g/cm³ . 25cm³ = 77.5 g

Let"s transform the mass to moles → 77.5 g / 159.8 g/mol = 0.485 moles



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I woke up, checked out NASA, stole their spaceship and also went into outerarea. The following thing I kbrand-new was that I was flying around while Donvital was driving the ship to sarotate and then checked out jupiter and also then we experienced asteroids flying approximately and also then saw countless stars

Explanation:


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The correct jiyuushikan.org is the second option; sodium (Na) and also potassium (K.)Both sodium and also potassium have the very same variety of valence electrons. 
Natural gas or methane is a fossil fuel. In a abundant supply of air, it burns to give carbon dioxide and water. Write a balanc

jiyuushikan.org:

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CO_2 + 2H_2O" alt="CH_4 + 2O_2 --> CO_2 + 2H_2O" align="absmiddle" class="latex-formula">

Explanation:

The chemical formula for methane is

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The chemical formula for oxygen is

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The chemical formula for carbon dioxide is

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The chemical formula for water is

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Methane burns in oxygen to give carbon dioxide and water:

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CO_2 + H_2O" alt="CH_4 + O_2 --> CO_2 + H_2O" align="absmiddle" class="latex-formula">

The well balanced equation that will encertain an equal number of each atom on the left and right-hand also sides of the equation would certainly be:

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CO_2 + 2H_2O" alt="CH_4 + 2O_2 --> CO_2 + 2H_2O" align="absmiddle" class="latex-formula">


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6 months ago
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