All categories

3 years ago

PLEASE HELP I AM FAILING SCIENCE!!!

Chemistry

1 answer:

kherson [118]3 years ago

8 0

Answer: B. Mg

Explanation:

Ionization energy is the energy required for the removal of valence electron from an isolated gaseous atom.

Ionization energy increases as we move across the period as the atomic size decreases as the electrons are being added to the same energy level.

Ionization energy decreases as we move down the group as the atomic size increases due to the addition of shells.

As magnesium (Mg) lies to the right of Sodium (Na) and Poatssium (K) and Calcium (Ca) lies below Magnesium (Mg), Mg has the highest ionization energy.

You might be interested in

Using standard heats of formation, calculate the standard enthalpy change for the following reaction. 2H2S(g) 3O2(g)2H2O(l) 2SO2

Marizza181 [45]

Answer:

$\Delta _rH=-1124.14kJ/mol$

Explanation:

Hello!

In this case, since the standard enthalpy change for a chemical reaction is stood for the enthalpy of reaction, for the given reaction:

$2H_2S(g) +3O_2(g)\rightarrow 2H_2O(l) +2SO_2(g)$

We set up the enthalpy of reaction considering the enthalpy of formation of each species in the reaction at the specified phase and the stoichiometric coefficient:

$\Delta _rH=2\Delta _fH_{H_2O,liq}+2\Delta _fH_{SO_2,gas}-2\Delta _fH_{H_2S,gas}-3\Delta _fH_{O_2,gas}$

In such a way, by using the NIST database, we find that:

$\Delta _fH_{H_2O, liq}=-285.83kJ/mol\\\\\Delta _fH_{SO_2, gas}=-296.84kJ/mol\\\\\Delta _fH_{O_2,gas}=0kJ/mol\\\\\Delta _fH_{H_2S,gas}=-20.50kJ/mol$

Thus, we plug in the enthalpies of formation to obtain:

$\Delta _rH=2(-285.73kJ/mol)+2(-296.84kJ/mol)-2(-20.50kJ/mol)-3(0kJ/mol)\\\\\Delta _rH=-1124.14kJ/mol$

Best regards!

8 0

2 years ago

HURRY PLEASE HELP

Dahasolnce [82]

Answer:

Explanation:

its A

facts o.o

7 0

3 years ago

Why is coal non renewable

sweet-ann [11.9K]

Answer:

Coal is classified as a nonrenewable energy source because it takes millions of years to form. Coal contains the energy stored by plants that lived hundreds of millions of years ago in swampy forests.

8 0

3 years ago

Read 2 more answers

what do you think caused the changes in the finch population and average beak size during the drought

Free_Kalibri [48]

Would it be lack of water and food?

8 0

3 years ago

14. What characteristics of Earth's surface can be determined by using a topographic map?

Leno4ka [110]

The answer is letter a. Hill terrain, hill slope, and hill elevation

6 0

3 years ago