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1 year ago

Which of the following concerning second ionization energies is true?

Chemistry

1 answer:

Dennis_Churaev [7]1 year ago

5 0

Answer:

Explanation:

The fact is that the both elements belong to different groups in the periodic table. Mg is in group 12 while Al is in group 13. The outer most electron configuration for Mg2+=[Ne]3s0

Al+= [Ne]3s13p0

It is evident that in Al+, the second electron is to be removed from a filled 3s subshell which is energetically unfavourable. Unlike In Mg2+ where the two electrons are removed. There is always a tendency towards a quick loss of all the valence electrons in the valence shell. It will be more difficult to remove an electron from a filled shell.

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What is the number of moles in 0.025 g (NH4)2Cr2O7?

Free_Kalibri [48]

We are asked to calculate the number of moles in a given mass of a substance. To be able to calculate it, we need the molar mass of the substance. For (NH4)2Cr2O7, the molar mass would be 252.07 g/mol. We calculate as follows:

0.025 g (NH4)2Cr2O7 ( 1 mol / 252.07 g ) = 0.0001 mol (NH4)2Cr2O7

Hope this answers the question. Have a nice day.

4 0

2 years ago

If element x forms the oxides xo and x2o3 the oxidation numbers of element x are

Deffense [45]

Answer:

b) +2 and +3.

Explanation:

Hello,

In this case, given the molecular formulas:

$XO$

And:

$X_2O_3$

We can relate the subscripts with the oxidation states by knowing that they are crossed when the compound is formed, for that reason, we notice that oxygen oxidation state should be -2 for both cases and the oxidation state of X in the first formula must be +2 since both X and O has one as their subscript as they were simplified:

$X^{+2}O^{-2}$

Moreover, for the second case the oxidation state of X should be +3 in order to obtain 3 as the subscript of oxygen:

$X_2^{+3}O_3^{-2}$

Thus, answer is b)+2 and +3

Best regards.

3 0

1 year ago

Calculate the mass (in grams) of 250mL of ether at 25 oC. The density of

leonid [27]

Volume=250mL
Density=0.71g/ml

$\boxed{\sf Density=\dfrac{Mass}{Volume}}$

$\\ \sf{:}\implies Mass=Density(Volume)$

$\\ \sf{:}\implies Mass=0.71(250)$

$\\ \sf{:}\implies Mass=177.5g$

6 0

1 year ago

When food spoils, it is a chemical reaction. For example, rancid butter is produced when the fat molecules in the butter undergo

Sergio039 [100]

Answer: Decreases the rate of reaction

Remove water from food by dehydration.
Transport food in a refrigerated truck.
Store food in airtight containers.
Store food in a refrigerator after opening.

Does not decrease the rate of reaction

Store food in the open air.
Place food on a warm surface.

Explanation: Dehydration of food excludes water from food which is one of the factor needed by microorganisms for growth, so it decreaese the rate of reaction.

Transporting food in refrigerated trucks lowers the temperature of food and not many microorganisms are active at very low temperatures, so it decreases the rate of reaction.

Storing food in airtight containers excludes air which is one of the factors required for microbial activity, so it decreases reaction rate.

Storing food in refrigerators after opening also lowers the temperature of food and hence the the rate of microbial activity.

Storing food in the open air does not decrease microbial activity instead it provides microorganisms with the favorable conditions for their activity such as air and water from water vapor in the air.

Placing food on a warm surface does not decrease rate of reaction because microorganisms are very active in warm and humid environments.

4 0

1 year ago

In the figure shown, AD, CE, and FB intersect at point F.

EleoNora [17]

Answer:

you need to send us the figure

Explanation:

7 0

1 year ago