Answer:
lo siento pero no entiendo
Explanation:
Iron radiates energy faster than lead. Iron has higher heat conductivity than lead.
Answer:
a. Endothermic
b. 6586J are absorbed.
Explanation:
a. When the reaction occurs, the temperature is decreasing from 20.0°C to 15.0°C, that means the reaction is absorbing heat and is <em>endothermic.</em>
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b. To find the heat absorbed we must use:
Q = -m*ΔT*C
<em>Where Q is change in heat, </em>
<em>m is the mass of solution (300g + 14.8g = 314.8g)</em>
<em>ΔT is change in temperature (15.0°C - 20.0° = -5.0°C)</em>
<em>And C is specific heat of the solution (4.184J/g°C assuming is the same heat than the heat of pure water).</em>
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Replacing:
Q = -314.8g*-5.0°C*4.184J/g°C
Q =
<h3>6586J are absorbed</h3>
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Answer:
Exposure of a red blood cell to a hypotonic solution causes swelling and eventual bursting of the cell membrane upon prolonged exposure.
Exposure of a gram positive bacterial cell causes the flow of water into the cell however, its rigid cell wall protects it from bursting.
Explanation:
A red blood cell has a cell membrane but no rigid cell wall. The inside of a red blood cell is <em>hypertonic</em> (contains more solutes like DNA, proteins) therefore, an exposure to a <em>hypotonic</em> solution ( solution with less solutes and more water), causes water to flow into the cell membrane by osmosis.
Osmosis is the movement of fluids from a region of higher concentration to a region of lower concentration. This creates a balance in fluid contents across both environments.
After prolonged exposure to the<em> hypotonic</em> solution, the flexible cell membrane swells and eventually bursts.
A gram positive bacterial cell has a rigid cell wall and a cell membrane. When exposed to a <em>hypotonic</em> solution, water flows from the outside environment to the interior of the cell by osmosis through the cell wall and membrane. The rigid cell wall of the bacterial cell however, contains the swelling and prevents the cell from bursting.
Energy needed : 1955.03 J
<h3>Further explanation</h3>
Heat can be formulated:
Q=m.c.Δt
Q=heat,J
m=mass,g
c=specific heat,J/g °C
Δt=temperature, °C
m=87.3 g
Δt= 47.3-22.5=24.8 °C
c=0.903 J/g °C
