CHEMISTRY HIGH SCHOOL

Determine how many moles of O2 are required to react completely with 6.7 moles C6H14.

Answers

Answer 1
Answer: I think *extra stress on the word think lol* it's 6.7 moles of O₂.
unless you have the full formula, giving me the amount of moles in C₆H₁₄ and O₂.

hopefully this helps. :/

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The making of ice cubes is an endothermic reaction

Answers

Answer:

no

Explanation:

it is not endothermic reaction

At a particular temperature, K = 4.1 ✕ 10−6 for the following reaction. 2 CO2(g) 2 CO(g) + O2(g) If 2.3 moles of CO2 is initially placed into a 4.9-L vessel, calculate the equilibrium concentrations of all species.

Answers

Answer:

concentration of [O_2] = 0.0124 = 12.4 ×10⁻³ M

concentration of [CO] = 0.0248 = 2.48 ×10⁻² M

concentration of [CO_2] = 0.4442 M

Explanation:

Equation for the reaction:

2CO_2_{(g)                ⇄          2CO_{(g)       +       O_2_{(g)

Concentration of   CO_2_{(g) = (2.3)/(4.9)  = 0.469

For our ICE Table; we have:

                       2CO_2_{(g)                ⇄          2CO_{(g)       +       O_2_{(g)

Initial                 0.469                              0                           0

Change              - 2x                                +2x                      +x

Equilibrium       (0.469-2x)                       2x                         x

K = ([CO]^2[O])/([CO_2]^2)

K = ([2x]^2[x])/([0.469-2x]^2)

4.1*10^(-6)=(2x^3)/((0.469-2x)^2)

Since the value pf K is very small, only little small of  reactant goes into product; so (0.469-2x)² = (0.469)²

4.1*10^(-6) = (2x^3)/((0.938))

2x^3 =3.8458*10^{-6

x^3 =(3.8458*10^(-6))/(2)

x^3=1.9229*10^{-6

x=\sqrt[3]{1.9929*10^(-6)}

x = 0.0124

∴ at equilibrium; concentration of  [O_2] = 0.0124 = 12.4 ×10⁻³ M

concentration of [CO] = 2x  = 2 ( 0.0124)

= 0.0248

= 2.48 ×10⁻² M

concentration of [CO_2] = 0.469-2x

= 0.469-2(0.0124)

= 0.469 - 0.0248

= 0.4442 M

What would happen if you play a note in a cold day on a flute?

Answers

I don't know if this is the answer you are looking for but it would be flat unless the player pushed the tuning slide in.

Why do the elements at the bottom of the periodic table have lower ionization energies than their group/family partners at the top of the periodic table?

Answers

Ionization energy is the energy required to remove the losely bounded electron from an isolated gaseous atom of an element, so if an electron is more attracted towards nucleus it will require higher energy. On increasing size of an atom the electrons fall distant from the nucleus and will observe less effective nuclear energy hence less amount of energy will be required to remove them.

On moving down the group, the size of elements increases hence effective nuclear charge will decrease thus ionization energy will decrease.

Elements at the bottom of the periodic table have lower ionization energies compared to their group or family partners at the top of the periodic table because, they have more energy levels.  

Ionization energy decreases down the group as less energy is required to remove outer most electrons as energy levels increases.

Further Explanation

Ionization energy

  • Ionization energy is the energy required to remove outermost electrons from the outermost energy level. Energy is required to remove an electron from an atom.
  • The closer an electron is to the nucleus the more energy is required, since the electron is more tightly bound to the atom thus making it more difficult to remove, hence higher ionization energy.
  • Ionization energy increases across the periods and decreases down the group from top to bottom.  
  • Additionally, the ionization energy increases with subsequent removal of a second or a third electron.

First ionization energy  

  • This is the energy required to remove the first electron from the outermost energy level of an atom.
  • Energy needed to remove the second electron to form a divalent cation is called the second ionization energy.

Trend in ionization energy  

1. Down the group (top to bottom)

  • Ionization energy decreases down the groups in the periodic table from top to bottom.
  • It is because as you move down the group the number of energy levels increases making the outermost electrons get further from the nucleus reducing the strength of attraction to the nucleus.
  • This means less energy will be required compared to an atoms of elements at the top of the groups.

2. Across the period  (left to right)

  • Ionization energy increases across the period from left to right.
  • This can be explained by an increase in nuclear energy as extra protons are added to the nucleus across the period increasing the strength of attraction of electrons to the nucleus.
  • Consequently, more energy is needed to remove electrons from the nucleus.

Keywords: Ionization energy, periodic table, energy levels, electrons

Learn more about

Level: High school  

Subject: Chemistry  

Topic: Periodic table and chemical families  

Sub-topic: Ionization energy

What is observed when an iron bar is dipped into a solution of silver nitrate​

Answers

Answer:

I think it will start to have a greenish color and get lighter

Explanation:

How does water help cells keep an even temperature despite temperature changes inthe environment?

Answers

Water has high specific heat. So its temperature will not easy to change. Then can help cells keep an even temperature despite temperature changes in the environment.

Final answer:

Water helps in maintaining temperature in cells due to its high heat capacity. This property allows water to absorb or release a large amount of heat without significantly changing its own temperature. As such, cells can keep a stable temperature despite environmental changes.

Explanation:

Water has a high heat capacity, which is the amount of heat it takes to change its temperature. Due to this high heat capacity, it can absorb or release a large amount of heat without a significant change in its own temperature. This helps cells maintain a relatively stable temperature and protect biological processes. For instance, when the external environment is hot, cells can avoid getting overheated as the water in them absorbs and distributes the heat evenly. Similarly, if the environment is cold, the water in the cells releases heat which helps to keep them warm. Hence, regardless of the temperature changes in the environment, the high heat capacity of water aids cells in preserving a relatively even temperature.

Learn more about Water in Cells here:

brainly.com/question/32862677

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