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Sphinxa [80]
3 years ago
7

A. ¿Que es la radiactividad?

Chemistry
1 answer:
galben [10]3 years ago
6 0

A: Fenómeno físico que presentan ciertos cuerpos, consistente en la emisión de partículas o radiaciones, o de ambas a la vez, procedentes de la desintegración espontánea del átomo.

B: El conocimiento del átomo, como todo conocimiento científico, nace  de la curiosidad del hombre por comprender lo que le rodea en su naturaleza y en su funcionamiento. Por explicarse los fenómenos naturales.

C: Las radiografías, generalmente llamadas rayos X, producen imágenes como sombras de huesos y ciertos órganos y tejidos. Las radiografías son muy buenas para detectar problemas óseos. Pueden mostrar algunos órganos y tejidos blandos; sin embargo, la MRI y la CT suelen crear mejores imágenes de los mismos. Aun así, las radiografías son rápidas, fáciles de obtener y menos costosas que los otros estudios, por lo que se pueden usar para obtener información rápidamente.

D:La denominación rayos X designa a una radiación electromagnética, invisible para el ojo humano, capaz de atravesar cuerpos opacos y de imprimir las películas fotográficas. Los actuales sistemas digitales permiten la obtención y visualización de la imagen radiográfica directamente en una computadora (ordenador) sin necesidad de imprimirla. La longitud de onda está entre 10 a 0,01 nanómetros, correspondiendo a frecuencias en el rango de 30 a 30000 PHz (de 50 a 50000 veces la frecuencia de la luz visible).

E: Es inferior, con una carga de trabajo típica. La información publicada actualmente indica que la dosis de radiación a un gastroenterólogo puede ser sustancialmente inferior a la de un cardiólogo intervencionista. Por lo general los tiempos de fluoroscopia en los procedimientos gastroenterológicos son mucho más cortos que en intervencionismo cardiológico.

F: La posibilidad de que una radiografía durante el embarazo cause daños al feto es mínima. En general, los beneficios de la información de diagnóstico que se obtiene mediante radiografías superan los posibles riesgos para el bebé.

G:--------------------------------------------------

SIN RESPUESTA :), ESPERO QUE TE HAYA AYUDADO A PESAR DE QUE NO HUBO UNA RESPUESTA G

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What would be the interactions between side chains of aspartate and arginine at a neutral ph?
weeeeeb [17]

The answer is asparagine interactions between aspartate and arginine side chains at neutral pH

<h3>What side chain does arginine have?</h3>
  • The amino acid arginine has the formula (H2N)(HN)CN(H)(CH2)3CH(NH2)CO2H.
  • A guanidino group is attached to a typical amino acid framework in the molecule.
  • The carboxylic acid is deprotonated (CO2) and both the amino and guanidino groups are protonated, resulting in a cation at physiological pH.
  •  The guanidine group in arginine is the precursor for nitric oxide production. it is a white, water-soluble solid, like all amino acids.

learn more about arginine refer

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8 0
2 years ago
A reaction that occurs in the internal combustion engine is
Anna35 [415]

Answer:

Explanation:1) ΔrH = 2mol·ΔfH(NO) - (ΔfH(O₂) + ΔfH(N₂)).

ΔrH = 2 mol · 90.3 kJ/mol - (0 kJ/mol + 0 kJ/mol).

ΔrH = 180.6 kJ.

2) ΔS = 2mol·ΔS(NO) - (ΔS(O₂) + ΔS(N₂)).

ΔS = 2mol · 210.65 J/mol·K - (1mol · 205 J/mol·K + 1 mol · 191.5 J/K·mol).

ΔS = 24.8 J/K.

3) ΔG = ΔH - TΔS.

55°C: ΔG = 180.6 kJ - 328.15 K · 24.8 J/K = 172.46 kJ.

2570°C: ΔG = 180.6 kJ - 2843.15 K · 24.8 J/K = 110.09 kJ.

3610°C: ΔG = 180.6 kJ - 3883.15 K · 24.8 J/K = 84.29 kJ.

7 0
3 years ago
A block of aluminum occupies a volume of 15.0 cm and weighs 40.5 g. What is its density?
mafiozo [28]

Answer:

2.7 g/cm^3

Explanation:

D = m/V

D = 40.5 g / 15 cm^3

D =  2.7 g/cm^3

7 0
3 years ago
Which equation represents a change that results in an increase in disorder?(1 ) I2(s)=&gt;I2(g)
ankoles [38]

Answer : The correct option is, (1) I_2(s)\rightarrow I_2(g)

Explanation :

Entropy : It measures the disorderedness or randomness of the molecule.

That means higher the disorderedness, higher will be the entropy.

As we are going from solid state to liquid state, liquid state to gaseous state, the disorderedness increases due to the less inter-molecular interaction between the molecules.

And, as we are going from gaseous state to liquid state, liquid state to solid state, the disorderedness decreases due to the more inter-molecular interaction between the molecules.

(1) I_2(s)\rightarrow I_2(g)

In this reaction, the disorderedness increases because the state changes from solid to liquid.

(2) CO_2(g)\rightarrow CO_2(s)

In this reaction, the disorderedness decreases because the state changes from gaseous to solid.

(3) 2Na(s)+Cl_2(g)\rightarrow 2NaCl(s)

In this reaction, the disorderedness decreases because the state changes from gaseous to solid.

(4) 2H_2(g)+O_2(g)\rightarrow 2H_2O(l)

In this reaction, the disorderedness decreases because the state changes from gaseous to liquid.

Hence, the correct option is, (1) I_2(s)\rightarrow I_2(g)

8 0
3 years ago
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These ions are disjoint by the charge on the ion into four dissimilar tables and listed alphabetically within each table. Each polyatomic ion, has it called, chemical, formula, two dimensional drawing, and three dimensional representation are given.
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4 years ago
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