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olchik [2.2K]
3 years ago
9

Which of the following chemical formulas could represent a stable compound formed with an element "X" from group 1A and Oxygen?

Chemistry
1 answer:
vaieri [72.5K]3 years ago
6 0

Answer:

2. X₂O

Explanation:

  • Elements in group 1A are known as alkali metal. Examples include lithium, sodium, and potassium among others.
  • These elements have one valence electron in the outermost energy level and therefore form cations with a charge of +1.
  • They have a valency of 2.
  • Oxygen, on the other hand,has a valency of 2.
  • Therefore, a chemical formula of a compound formed when an element in group 1A say X reacts with oxygen will be X₂O.
  • To write the formula, we identify the symbol of the elements and their valence.
  • Then the atoms of the two elements exchange their valencies which are written as a subscript on each symbol of an element.
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If 45.0 mL of ethanol (density=0.789 g/mL) initially at 9.0 C is mixed with 45.0 mL of water (density=1.0 g/mL) initially at 28.
Klio2033 [76]

Answer : The final temperature of the mixture is 22.7^oC

Explanation :

In this problem we assumed that heat given by the hot body is equal to the heat taken by the cold body.

q_1=-q_2

m_1\times c_1\times (T_f-T_1)=-m_2\times c_2\times (T_f-T_2)

And as we know that,

Mass = Density × Volume

Thus, the formula becomes,

(\rho_1\times V_1)\times c_1\times (T_f-T_1)=-(\rho_2\times V_2)\times c_2\times (T_f-T_2)

where,

c_1 = specific heat of ethanol = 2.3J/g^oC

c_2 = specific heat of water = 4.18J/g^oC

m_1 = mass of ethanol

m_2 = mass of water

\rho_1 = density of ethanol = 0.789 g/mL

\rho_2 = density of water = 1.0 g/mL

V_1 = volume of ethanol = 45.0 mL

V_2 = volume of water = 45.0 mL

T_f = final temperature of mixture = ?

T_1 = initial temperature of ethanol = 9.0^oC

T_2 = initial temperature of water = 28.6^oC

Now put all the given values in the above formula, we get

(0.789g/mL\times 45.0mL)\times (2.3J/g^oC)\times (T_f-9.0)^oC=-(1.0g/mL\times 45.0mL)\times 4.18J/g^oC\times (T_f-28.6)^oC

T_f=22.7^oC

Therefore, the final temperature of the mixture is 22.7^oC

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Boyle's Law represents the relationship of volume as pressure changes. The constants of Boyle's Law are:
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Let's examine the words.

"… volume…is inversely proportional to the pressure …" This means that volume and pressure are the <em>variables</em>.

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a, c, and e are <em>wrong</em>, because pressure is a variable.

b is <em>wrong</em>, because volume is a variable.

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