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Grace [21]
3 years ago
5

Which of the following is not a way an atom can achieve stability?

Chemistry
1 answer:
Dmitrij [34]3 years ago
6 0
Answer:
<span>D. Remove electrons from its full outer energy level
</span>
Explanation:
The atom achieves its stable state when its outermost shell is completely full with 8 electrons (based on the octet rule)
Any atom whose outer shell is not completely full tends to lose gain or share electrons in order to complete this shell and become stable
Therefore, it is pointless for an atom with an outer shell having 8 electrons to lose electrons, because by this it convert from being stable to being unstable.

Hope this helps :)
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This long unit of measurement can be used to measure great distances. It *
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Kilometer.

Kilo=1,000
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1 year ago
GIIVNG BRAINLYY!!!! Universal indicator is an acid/base indicator that can be added to a solution to determine its pH. Universal
Slav-nsk [51]

Answer:

When universal indicator is added to a solution, the color change can indicate the approximate pH of the solution. Acids cause universal indicator solution to change from green toward red. Bases cause universal indicator to change from green toward purple.

Explanation:

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3 years ago
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During chemistry, Dan mixes two clear, colorless solution and mixing them produces a yellow precipitate in a clear, colorless fi
Andrei [34K]

Answer: Formation of precipitate indicates that there has been a chemical reaction.

Explanation:

Chemical reaction:  It is defined as change in arrangement of the atoms so as to form a new substance.

Mixing of two clear solutions that is lead nitrate and potassium iodide gives out yellow solid precipitate of lead iodide with aqueous solution of potassium nitrate.

Pb(NO_3)_2(aq)+2KI(aq)\rightarrow PbI_2(s)+2KNO_3(aq)

The physical evidence which indicates that chemical reaction has been taken place is formation of yellow solid precipitate of lead iodide ,(PbI_2).


6 0
4 years ago
What is the most appropriate way to present the data below?
Arada [10]

Answer:

I think <em><u>bar graph</u></em> is the appropriate way to present the data.

4 0
4 years ago
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The following is the balanced equation of the combustion of methane gas with oxygen gas:
tangare [24]

Answer:

The correct option is: C. 1.1 L

Explanation:

Given: Temperature: T = 25°C = 25 +273 = 298K      (∵ 1°C = 273K)

Pressure: P = 1 atm, Given mass of- CH₄: m₁ = 1g; O₂: m₂ = 3g

Volume: V= ?

Molar mass of CH₄: M₁ = 16g; O₂: M₂ = 32g

As <em>Number of moles</em>: n = \frac{given\: mass (m)}{molar\: mass (M)}

∴ Number of moles of CH₄: n_{1} = \frac{m_{1}}{M_{1}} = \frac{1 g}{16 g} = 0.0625 mol

Number of moles of O₂: n_{2} =\frac {m_{2}}{M_{2}} = \frac{3 g}{32 g} = 0.0937 mol

In the given reaction: CH₄(g) + 2O₂(g) → CO₂(g) + 2H₂O(l)

1 mole of methane (CH₄) reacts with 2 moles oxygen (O₂) to give 1 mole of CO₂.

So 0.0625 mol of CH₄ reacts with \frac{2 \times 0.0625}{1} = 0.125 mol \: O_{2}.

<u><em>Thus the limiting reagent is O₂</em></u><u>.</u>

Now, 2 moles O₂ gives 1 mole of CO₂

So 0.0937 mol O₂ gives \frac{1 \times 0.0937}{2} = 0.0468 mol \:CO_{2}

<u><em>Therefore, the total number of moles of gas after the completion of the reaction: </em></u><em>n = number of moles of CO₂: n₃ = 0.0468 mol</em>

Now to calculate the volume of the balloon, we use the ideal gas law: PV =nRT

\Rightarrow V = \frac{nRT}{P}

Here, R is the gas constant = 0.08206 L·atm/(mol·K)

T is Temperature,

P is Pressure,

n is Total number of moles of gas

and, V is Volume

<u>Therefore, the volume of the balloon after the completion of the reaction</u>:

V = \frac{n_{3}RT}{P}

V = \frac{0.0468 mol \times 0.08206 L.atm/(mol.K) \times 298K}{ 1atm}

\Rightarrow V = 1.14 L

<u>Therefore, the total volume of the balloon after the completion of the reaction: V = 1.14 L </u>

5 0
4 years ago
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