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3 years ago

Por qué los alimentos se dañan con mayor facilidad a temperatura ambiente que cuando están en la nevera?

Chemistry

1 answer:

ella [17]3 years ago

4 0

Answer:

Esto se debe a que la heladera tiene mucha menor temperatura que la temperatura ambiente.

Esta menor temperatura ayuda a luchar contra los microorganismos que están en los alimentos (bacterias, hongos, etc) pues detiene en gran medida su repreduccion, la cual se ve maximizada en los rangos entre 5°C y 60°C, tal que la temperatura ambiente suele estar en el rango donde los microorganismos prosperan y se reproducen, es por ello que los alimentos se conservan mucho mejor en ambientes fríos (como la nevera) que en temperatura ambiente.

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A sample of nitrogen occupies 10.0 liters at 25°c and 98.7 kpa. What would be the volume at 20°c and 102.7 kpa?

Fynjy0 [20]

Answer:

9.4 liter

Explanation:

1) Data:

V₁ = 10.0 L

T₁ = 25°C = 25 + 273.15 K = 298.15 K

P₁ = 98.7 Kpa

T₂ = 20°C = 20 + 273.15 K = 293.15 K

P₂ = 102.7 KPa

V₂ = ?

2) Formula:

Used combined law of gases:

PV / T = constant

P₁V₁ / T₁ = P₂V₂ / T₂

3) Solution:

Solve the equation for V₂:

V₂ = P₁V₁ T₂ / (P₂ T₁)

Substitute and compuite:

V₂ = P₁V₁ T₂ / (P₂ T₁)

V₂ = 98.7 KPa × 10.0 L × 293.15 K / (102.7 KPa × 298.15 K)

V₂ = 9.4 liter ← answer

You can learn more about gas law problems reading this other answer on Brainly: brainly.com/question/12732788.

5 0

3 years ago

Identify the arrows that represent the process of cooling

GuDViN [60]

When Gas Becomes a Liquid.

When Gas Becomes a Solid.

When Liquid Becomes a Solid.

(Works for Plato Users) .

5 0

3 years ago

Read 3 more answers

The empirical formula of pyrogallol is C2H2O. Its molar mass is 126 g mol-1. What is the molecular formula?C4H4O2C2H6O3C6H6O3C2H

VARVARA [1.3K]

Answer:

The molecular formula of pyrogallol is: C6H6O3

Explanation:

Step 1: Data given

Empirical formula of pyrogallol is C2H2O

Molar mass of pyrogallol = 126 g/mol

Molar mass of Carbon (C) = 12 g/mol

Molar mass of hydrogen (H) = 1.01 g/mol

Molar mass of oxygen (O) = 16 g/mol

Step 2: Calculate molar mass of the empirical formula

2*12 + 2*1+ 16 = 42 g/mol

Step 3: Calculate the molecular formula

To find the molecular formule , we should multiply the empirical formula by n

n can be found by dividing molar mass of pyrogallol by the molar mass of the empirical formula

n = 126 g/mol / 42 g/mol ≈ 3

We should mulitply the empirica lformula by 3

3*(C2H2O) gives C6H6O3

if we calculate the molar mass now:

6*12 +6*1 + 3*16 = 126 g/mol

The molecular formula of pyrogallol is: C6H6O3

6 0

3 years ago

What amount of ice must be added to 250 g of water at 15°c to cool the water to 0°c and have no ice left

Juliette [100K]

Answer:

$\mathbf{m= 47 \ g}$

Explanation:

The heat needed to melt ice $(q_1)$ + heat needed to cool water $(q_2)$ = 0

$m\Delta H_{fusion} + mc \Delta T = 0$

$m \times 333.55 J g^{-1} + 250 \ g \times 4.184 \ Jg^{-1 \ 0 } \times (-15.0 \ ^0 C) = 0$

$m \times 333.55 J g^{-1} =15690$

$m=\dfrac{15690 \ J }{333.55 J g^{-1} }$

$\mathbf{m= 47 \ g}$

7 0

3 years ago

A substance which contains various elements or compounds without bonding or in fixed proportions is a(n) _____.

julia-pushkina [17]

The correct answer that would best complete the given statement above would be the word MIXTURE. A substance which contains various elements or compounds without bonding or in fixed proportions is a mixture. When a chemical union occurs, this is when a compound is being formed. Hope this answer helps.

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3 years ago