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3 years ago

Use the periodic table to answer the questions below.

Chemistry

2 answers:

MrRa [10]3 years ago

4 0

Answer:

Second option.

Explanation:

Nitrogen is the first element of group 15, and its number atomic is 7, so, in its neutral state, it has 7 electrons.

By Linus Pauling diagram (see figure), the electronic distribution will be:

$1s^{2} 2s^{2} 2p^{3}$

The distribution follows the arrows, from the less energetic subshell for the most energetic one. The subshell s has an only magnetic number, so only one orbital to put electrons. Subshell p has 3 magnetic numbers, so 3 orbitals to put electrons.

To put the electrons, we have to follow Hund's Rule: fulfill the orbitals which only one spin, until all orbitals have this spin, so continue, with the other spin, until finishing the electrons on that subshell. Spin is the rotation of the electron, and it can be +1/2 or -1/2.

So, for subshell 2p, how there are only 3 electrons, all three will be put with the same spin (+1/2, up arrow). If there was one more electron, it would be filled in the first orbital with the spin -1/2, down arrow.

Romashka-Z-Leto [24]3 years ago

3 0

B ............ is the answer,

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Is chlorine malleable or brittle?

Oksana_A [137]

Chlorine is not malleable or ductile. This is so because nonmetals, like chlorine, are brittle.

<h3>What is a chlorine physical characteristic?</h3>

The odor of chlorine is distinctively intrusive and upsetting. The liquid is pure amber, while the gas is a greenish yellow tint. The information on the physical characteristics of chlorine as discovered by various researchers reveals some variances.

<h3>What is brittle versus ductile or malleable?</h3>

In essence, metals that are malleable or ductile can both deform in some ways through plastic deformation in response to stress. Brittle metals are those that fracture without significant plastic deformation. Brittle is the antithesis of ductile and malleable in this context.

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1 year ago

Suppose the half-life is 9.0 s for a first order reaction and the reactant concentration is 0.0741 M 50.7 s after the reaction s

bazaltina [42]

Answer: The time taken by the reaction is 84.5 seconds

Explanation:

The equation used to calculate half life for first order kinetics:

$k=\frac{0.693}{t_{1/2}}$

where,

$t_{1/2}$ = half-life of the reaction = 9.0 s

k = rate constant = ?

Putting values in above equation, we get:

$k=\frac{0.693}{9}=0.077s^{-1}$

Rate law expression for first order kinetics is given by the equation:

$k=\frac{2.303}{t}\log\frac{[A_o]}{[A]}$ ......(1)

where,

k = rate constant = $0.077s^{-1}$

t = time taken for decay process = 50.7 sec

$[A_o]$ = initial amount of the reactant = ?

[A] = amount left after decay process = 0.0741 M

Putting values in equation 1, we get:

$0.077=\frac{2.303}{50.7}\log\frac{[A_o]}{0.0741}$

$[A_o]=3.67M$

Now, calculating the time taken by using equation 1:

$[A]=0.0055M$

$k=0.077s^{-1}$

$[A_o]=3.67M$

Putting values in equation 1, we get:

$0.077=\frac{2.303}{t}\log\frac{3.67}{0.0055}\\\\t=84.5s$

Hence, the time taken by the reaction is 84.5 seconds

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3 years ago

What type of plants contain tubes that help transport water and nutrients into their other parts?

cricket20 [7]

Answer:

Explanation:

6 0

3 years ago

Cómo se denomina el calor que ponen en juego los sistemas materiales cuando cambian su temperatura? Seleccione una: a. Calor cin

Law Incorporation [45]

Answer:

La respuesta correcta es: b. Calor sensible

Explanation:

Al absorber calor, un sistema puede: aumentar su temperatura o cambiar de fase (es decir, pasar de un estado de agregación a otro). Los cambios de fase se producen a temperatura constante, por lo que el calor involucrado se denomina calor latente. Por ejemplo, cuando el agua líquida pasa a vapor por calentamiento a la temperatura de ebullición, esta temperatura se mantiene constante hasta que toda la masa de agua pasa al estado vapor. En cambio, cuando el sistema absorbe calor cambiando su temperatura pero permaneciendo en el mismo estado de agregación (por ejemplo, cuando calentamos agua líquida por debajo de la temperatura de ebullición), el calor involucrado se denomina calor sensible.

6 0

3 years ago

Use the ideal gas law to calculate the concentrations of nitrogen and oxygen present in air at a pressure of 1.0 atm and a tempe

zhannawk [14.2K]

Answer:

The concentration of nitrogen per liter of air is 3.189 × 10⁻² moles

while the concentration of oxygen per liter of air is 8.59 × 10⁻³ moles

Explanation:

From Dalton's law of partial pressure, we have the pressure of the air is due to the partial pressures of the constituent gases

Therefore from the ideal gas law we have

PV = nRT, or P = nRT/V which for nitrogen is with volume = 78 % of the total volume giving us

Pressure of nitrogen = nRT/(0.78V) and oxygen gives

nRT/(0.21V) while the remaining contituent 1 % is

nRT/(0.01V)

Therefore we have nRT/(0.78V) + nRT/(0.21V) + nRT/(0.01V) = Ptotal

however by Avogadro's law, equal volume of all gases at the same temperature and pressure contain equal number of molecules

and the partial pressure of a gas =mole fraction × total pressure

From which we have the mole fraction of nitrogen given as

nRT/(0.78V) + nRT/(0.21V) + nRT/(0.01V) = nRT/V

cancelling like terms gives

n(nitrogen)/0.78 +n(oxygen)/0.21 +n(others)/0.01 =n/1

therefore the mole fraction of nitrogen = 0.78

and the mole fraction of oxygen = 0.21

or n = PV/RT = 1 * 0.78/(0.082057* 298) = 3.189 × 10⁻² moles per liter

Also we have for oxygen =1*0.21/(0.082057* 298) = 8.59 × 10⁻³ moles per liter

7 0

4 years ago