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Vinvika [58]
2 years ago
10

Explain how information from stimuli becomes a memory

Chemistry
1 answer:
Soloha48 [4]2 years ago
6 0

Answer: A stimulus is something which can bring change in the physiology of the organism and can generate an immune response.

Explanation:

The information from stimuli is passed from the sensory memory to the short duration memory through the process of cognitive process. In the cognitive process the one aspect of the environment is concentrated and the other aspects are ignored. This helps in registering the effect of stimulus on the brain and its retention in the memory and also filters the unwanted stimuli.

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500 gramos de un mineral con una riqueza en cinc del 65 % se hacen reaccionar con una disolucion de acido sulfurico de riqueza 9
ryzh [129]

Answer:

Ver explicación abajo

Explanation:

LA pregunta esta incompleta, pero logré conseguir un ejercicio muy parecido a este con datos similares, y la pregunta que falta como tal son estas:

<em>"a) La cantidad de sal producida. </em>

<em>b)  Moléculas de hidrógeno obtenidas a 25 ºC y 740 mm Hg. </em>

<em>c)  El volumen de la disolución de ácido necesario para la reacción."</em>

Asumiendo que estos son los datos faltantes, hay que ver como resolver por parte:

<u>a) Cantidad de sal producida.</u>

En este caso debemos plantear la reacción que se lleva a cabo. Es un mineral que tiene Zinc y reacciona con acido sulfurico, por tanto la reacción que se lleva a cabo en teoría es:

Zn + H₂SO₄ -----------> ZnSO₄ + H₂

Entonces, queremos saber la cantidad de ZnSO₄ que se formó.

Para eso, debemos calcular primero cuantos gramos de zinc hay originalmente en la muestra, que son los que reaccionaron para formar esta sal, y luego los moles para que por medio de estequiometría, calculemos los moles de la sal.

Para la masa de Zinc, sabemos que el mineral contiene 65% de zinc o 0,65 entonces:

mZn = 0,65 * 500 = 325 g

Calculamos los moles usando la masa molecular de Zinc que es 65,37 g/mol:

moles = 325 / 65,37 = 4.97 moles

Ahora bien, como la reacción de arriba está bien balanceada, podemos asuimr por estequiometría que la relación Zn / ZnSO₄ es 1:1, asi que los moles de Zn serán los mismos de la sal por tanto:

moles Zn = moles ZnSO₄ = 4,97 moles

Calculando la masa molecular de ZnSO₄:

MM ZnSO₄ = 65,37 + 32 + (16 * 4) = 161,37 g/mol

Finalmente la masa de la sal es:

m ZnSO₄ = 4,97 * 161,37

<h2>mZnSO₄ = 802,01 g</h2>

b) Moléculas de hidrógeno obtenidas

PAra este caso, ya tenemos los moles de Zn, y por estequiometría, todas las especies presentes están en relación 1:1, así que los moles de hidrógeno son los mismos de zinc. No es necesario el dato de temperatura y presión acá pues ya tenemos los moles.

Para conocer el número de moléculas, necesitamos el número de abogadro que es 6.02x10²³ por lo tanto las moléculas de hidrógeno:

Moléculas de hidrógeno = 6,02x10²³ * 4,97

<h2>Moléculas de hidrógeno = 2.99x10²⁴ moléculas de H₂</h2>

<u>c) Volúmen de ácido empleado</u>

Finalmente para el ácido, como ya conocemos los moles empleados, podemos calcular la masa del ácido usando su peso molecular:

MM H₂SO₄ = (2*1) + 32 + (4*16) = 98 g/mol

m H₂SO₄ = 4,97 * 98 = 487,06 g

Ahora que ya sabemos su masa, solo calculamos la masa realmente usada (pues su %p/p es 96%) y con la densidad calculamos el volumen:

d = m/v

v = m/d

m H₂SO₄ (puro) = 487,96 * 0,96 = 467,58 g

El volumen será:

V = 467,58 g / 1,823

<h2>V = 256,49 mL</h2>

Espero que esto te sirva, o te ayude como impulso a tu ejercicio real.

5 0
3 years ago
Graph the circle which is centered at (4,4)(4,4)left parenthesis, 4, comma, 4, right parenthesis and has a radius of 3 units.
OleMash [197]

Answer:

i dont know the answer sorry

7 0
2 years ago
Determining Density and Using Density to Determine Volume or Mass
Shalnov [3]

corrected question:

Determining Density and Using Density to Determine Volume or Mass

(a) Calculate the density of mercury if 1.00 × 10 g occupies a volume of 7.36 cm³

(b) Calculate the volume of 65.0 g of liquid methanol (wood alcohol) if its density is 0.791 g/mL.

(c) What is the mass in grams of a cube of gold (density = 19.32 g/cm) if the length of the cube is 2.00 cm?

(d) Calculate the density of a 374.5-g sample of copper if it has a volume of 41.8 cm³ A student needs 15.0 g of ethanol for an experiment. If the density of ethanol is 0.789 g/mL, how many milliliters of ethanol are needed? What is the mass, in grams, of 25.0 mL of mercury (density = 13.6 g/mL)?

Answer:

density = \frac{mass}{volume}

ρ=m/v ,m=ρv,    v=m/ρ

(a)m=1*10g  , v=7.36cm³

    ρ=10/7.36 =1.36g/cm³

(b) m=65g, ρ=0.791 g/mL.

   v= 65/0.791 =82.17g/mL

(c) ρ=19.32g/cm³, l=2cm, v=l³=8cm³

    m=19..32*8=154.56g/cm³

(d) mass of copper=374.5g , v=41.8cm³

   ρ=374.5/41.8 =8.96g/cm³

 mass of ethanol=15g,  density of ethanol=0.789g/mL

v=15/0.789 =19.01mL

volume of mecury=25mL, density of mercury=13.6g/mL

m=25*13.6=340g

4 0
3 years ago
Why might Marie Curie have been motivated to teach the children of beet workers?
pav-90 [236]

Marie curie worked as a governess and she was awarded noble prize for her discoveries.

Explanation:

When Marie curie worked as a governess for three years her employer allowed her to teach reading to the children of peasant workers at his beet sugar factory. This was banned under Russian rule. During that time she studied chemistry lessons from her father by mail.

Marie curie was awarded the Noble prize in chemistry for her discoveries and studies of elements radium and polonium. She is the only women who is awarded the Noble prize twice.

She made her first research into the treatment of tumors with radiation and founded a Curie institutes, that are important medical research centers.

6 0
3 years ago
A 100.00 ml of volume of 0.500 M HCl was mixed with 100.00 ml of 0.500 M KOH in a constant pressure calorimeter. The initial tem
Virty [35]

Answer:

The heat of the reaction = -1985 J = -1.985 kJ

The enthalpy of the reaction is -39.7 kJ/ mol

Explanation:

<u>Step 1: </u>Data given

Volume of HCl = 100 mL the heat of the reaction = 0.1 L

Molarity of HCl solution = 0.500 M

Volume of KOH = 100 mL = 0.1 L

Molarity of KOH solution = 0.500 M

Initial temperature = 23.0 °C

Final temperature = 25.5 °C

Specific heat of the solution = 3.97 J/°C *g

Density of the solution = 1g/ mL

<u>Step 2: </u>Calculate heat

Q = m*c*ΔT

with m = the mass of both solution : 100g + 100 g ( since density = 1g/mL) = 200 g

c = the specific heat = 3.97 J/°C*g

ΔT  = T2 -T1 = 25.5 = 23 = 2.5 °C

Q = 200g *3.97 J/°C*g * 2.5°C = 1985 J  (= -1985 J because it's exothermic)

<u />

<u>Step 3:</u> Calculate the number of moles

Number of moles = Molarity * Volume

Number of moles = 0.5 * 0.1 L = 0.05 moles

(Moles of the acid are equal to the moles of water produced.

Moles of solution = 0.05 moles)

<u>Step 4: </u>Calculate the enthalpy of the reaction

ΔH = heat change /Number of moles

    = -1.985 kJ/ 0.05 moles

   =- 39700 J/mol = -39.7 kJ/ mol

The enthalpy of the reaction is -39.7 kJ/ mol

The enthalpy of the reaction is negative, this means the reaction is exothermic ( which means the final temperature is higher than the initial temperature.)

7 0
3 years ago
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