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3 years ago

Based on the information in the table, which elements are most likely in the same periods of the periodic table?

Chemistry

2 answers:

daser333 [38]3 years ago

3 0

The answer is A.<span>Boron and carbon are likely together in one period because they have very close atomic numbers, while gallium and germanium are likely together in another period because they have very close atomic numbers.
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Stells [14]3 years ago

3 0

The element that are most likely in the same period of periodic table is

<em> Boron and carbon are likely together in one period because they have very close atomic number, while gallium and germanium are likely together in another period because they have very close atomic numbers ( answer A)</em>

<u>Explanation</u>

Element in same period have the close atomic number .
The atomic number of an element is determined by number of protons the element have.
The number of proton are equal to number of electrons

Therefore boron is in atomic number 5 with 2.3 electronic configuration while carbon is in atomic number 6 with 2.4 electron configuration

since both boron and carbon have two energy level they are in period 2.

Gallium is in atomic number 31 with 2.8.8.8.5 electron configuration while Germanium (Ge) is in atomic number 32 with 2.8.8.8.6 electron configuration.

Since both gallium and germanium has 5 energy level they are in same period (period 5)

for example Aluminum,boron and gallium are in group (iii) since they have 3 valence electrons.

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What is Behavioral Adaption!!!!!!!<br> I need a definition quick!!!!

tia_tia [17]

Behavioral Adaptation is something that is natural in animals that are used for survival. Example: Birds Migrating north during the winter.

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3 years ago

A serving of Cheez-Its releases 130 kcal (1 kcal = 4.18 kJ) when digested by your body. If this same amount of energy were trans

Brut [27]

The final temperature : 78.925°C

<h3>Further explanation </h3>

Heat can be calculated using the formula:

Q = mc∆T

Q = heat, J

m = mass, g

c = specific heat, joules / g ° C

∆T = temperature difference, ° C / K

Energy releases = 130 kcal = 130 x 4.18 kJ=543.4 kJ

The final temperature :

$\tt \Delta T=\dfrac{Q}{m.c}\\\\\Delta T=\dfrac{543.4}{2.5\times 4.186~kJ/kg^oC}\\\\\Delta T=51.925^oC$

Final temperature :

ΔT=final-initial

51.925°c=final-27°c

final = 51.925+27=78.925°C

7 0

2 years ago

For alkyl halides used in SN1 and SN2 mechanisms, rank the leaving groups in order of reaction rate. You are currently in a rank

Alex777 [14]

Answer:

Iodide> Bromide > chloride > flouride

Explanation:

During a nucleophilic substitution reaction, a nucleophilie replaces another in a molecule.

This process may occur via an ionic mechanism (SN1) or via a concerted mechanism (SN2).

In either case, the ease of departure of the leaving group is determined by the nature of the C-X bond. The stronger the C-X bond, the worse the leaving group will be in nucleophilic substitution. The order of strength of C-X bond is F>Cl>Br>I.

Hence, iodine displays the weakest C-X bond strength and it is thus, a very good leaving group in nucleophillic substitution while fluorine displays a very high C-X bond strength hence it is a bad leaving group in nucleophilic substitution.

Therefore, the ease of the use of halide ions as leaving groups follows the trend; Iodide> Bromide > chloride > flouride

4 0

3 years ago

A person who is + for the rh factor has what antigen

Marina CMI [18]

Answer:

Explanation:

Most blood types are determined by red cell antigens that differ by one or two amino acids, the Rh positive blood group contains the D antigen

I hope this was helpful, please mark as brainliest

8 0

3 years ago

Salicylic acid (C7H6O3) reacts with acetic anhydride (C4H6O3) to form acetylsalicylic acid (C9H8O4).

zavuch27 [327]

Answer : The correct option is, (B) Salicylic acid

Solution :

First we have to calculate the moles of salicylic acid and acetic anhydride.

$\text{Moles of }C_7H_6O_3=\frac{\text{Mass of }C_7H_6O_3}{\text{Molar mass of }C_7H_6O_3}=\frac{70g}{138.121g/mole}=0.507moles$

$\text{Moles of }C_4H_6O_3=\frac{\text{Mass of }C_4H_6O_3}{\text{Molar mass of }C_4H_6O_3}=\frac{80g}{102.09g/mole}=0.783moles$

Now we have to calculate the limiting and excess reagent.

The balanced chemical reaction is,

$2C_7H_6O_3(aq)+C_4H_6O_3(aq)\rightarrow 2C_9H_8O_4(aq)+H_2O(l)$

From the balanced reaction we conclude that

As, 2 moles of salicylic acid react with 1 mole of acetic anhydride

So, 0.507 moles of salicylic acid react with $\frac{0.507}{2}=0.2535$ mole of acetic anhydride

The excess of acetic anhydride = 0.783 - 0.2535 = 0.5295 moles

That means the in the given balanced reaction, salicylic acid is a limiting reagent because it limits the formation of products and acetic anhydride is an excess reagent.

Hence, the limiting reagent is, salicylic acid.

7 0

3 years ago