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KiRa [710]
4 years ago
9

Select the correct electron configurations from the list below. You can refer to the periodic table for atomic numbers. Check al

l that apply.
A) The electron configuration of O2− is [He]2s22p6.
B) The electron configuration of Cs is [Xe]6s05d1.
C) The electron configuration of Ag+ is [Kr]5s14d9.
D) The electron configuration of Si is [Ne]3s23p2.
E) The electron configuration of Ni is [Ar]4s23d8.
Chemistry
1 answer:
Diano4ka-milaya [45]4 years ago
3 0

Answer:

Corrects answer are Option A and Option D

Explanation:

[He]2s22p4 → This is the electron configuration for O, but if you have the anion, oxide it means that it gain 2 electrons. That's why you have 2 more e- in last cape.

[Ne]3s23p2 → The correct electron configuration for Si.

Si is an element from group 14. Its oxidation state is 4-´,

with a tendency to lose 4 electrons, the 2 of level 3s and level 3p. 4 electrons are being necessary to reach the gas noble configuration.

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A reaction occurs in a calorimeter, resulting in the starting and final temperatures shown below. What can you say about the rea
ELEN [110]

"The reaction is exothermic and ΔH is negative" can be understood about the reaction and the enthalpy change (ΔH) during the reaction.

<u>Option: D</u>

<u>Explanation:</u>

When the reaction is positive, the process becomes endothermic, i.e. heat appears to be consumed by the system because the reaction products are more enthalpic than the reactants. When the reaction is negative, on the other hand, the process is exothermic, which is the total decrease in enthalpy is caused by heat production. Here the initial temperature is 21.0 C but increase in final temperature to 38.8 C, because if some processes require heat, others must give off heat when they take place.

4 0
4 years ago
You are on the Titanic and want to find something that will float because you didn't
damaskus [11]

Find volume of pillow

L=78cm

B=55cm

H=25cm

\\ \bull\tt\longrightarrow V=LBH

\\ \bull\tt\longrightarrow V=25(78)(55)

\\ \bull\tt\longrightarrow V=107250cm^3

\\ \bull\tt\longrightarrow V=10.72m^3

Now

Mass=5.5kg

\\ \bull\tt\longrightarrow Density=\dfrac{Mass}{Volume}

\\ \bull\tt\longrightarrow Density=\dfrac{5.5}{10.72}

\\ \bull\tt\longrightarrow Density=0.5kg/m^3

Density of water=1000kg/m^3

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8 0
3 years ago
A shiny chunk of metal is found to have a mass of 37.28g. The metal is dropped into a graduated cylinder which contains 20.0 mL
Amanda [17]

Answer: The density of the material is 2.66 g/mL and it is likely this  is made of Aluminum

Explanation:

The first step to know the material of the chunk of metal is to calculate its density. The general formula for density is P (density) = \frac{m (mass)}{ v (volume)}. Moreover, in this case, it is known the mass is 37.28 g, but the volume is not directly provided. However, we know the water in the graduated cylinder had a volume of 20.0 mL and this increased to 34.0 mL when the chunk of metal is added, this means the volume of the metal is 14 mL (34.0 mL - 20.0 mL = 14 mL). Now let's calculate the density:

P = \frac{37.28g}{14.0mL}

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6 0
4 years ago
How many atoms are there in 5.10 moles of sulfur?
Alexxx [7]
1 mole ------------- 6.02 x 10²³ atoms
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hope this helps!
3 0
3 years ago
Read 2 more answers
Give an example of a chemical reaction during which a single substance breaks<br> down. *
RoseWind [281]

Answer:

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O - Oxides of Metals => 2Fe₂O₃(s) => 4Fe°(s) + 3O₂(g)

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H - Hydroxides => Ca(OH)₂(s) => CaO(s) + H₂O(l)

E - Electrolysis => see above electrolysis of NaCl(l)

6 0
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