Answer:
A
Explanation:
When a reaction happens some of the reactants mass is released as energy so the mass of the product would be less
Answer:
Fortunately, Earth retains heat fairly well, so humans wouldn't freeze instantly. Without the Sun's rays, all photosynthesis on Earth would stop. All plants would die and, eventually, all animals that rely on plants for food — including humans — would die, too.
Answer:
4.61 x 10ˉ⁴ mole H₂(g)
Explanation:
Given electric current for 2 min. => 12.4ml of wet H₂(g) at 25⁰C & 715Torr => ? moles H₂(g)
PV = nRT => n = PV/RT
• P = P(H₂) + P(H₂O) = 715Torr = 715mm = P(H₂) + 23.8mm
=> P(H₂) = (715 – 23.8)mm = 619.2mm = 619.2mm/760mm/Atm = 0.815Atm
• V = 12.8ml = 0.0128L
• R = 0.08206 L∙Atm/mol∙K
• T = 25⁰C = 298K
Substituting … n = PV/RT
=> n = (0.815Atm)(0.0128L)/(0.08206 L∙Atm/mol∙K)(298K) = 4.61 x 10ˉ⁴ mole H₂(g)
Answer: The correct option is - The reaction container is cold.
Explanation: Endothermic reaction is a reaction in which the system absorbs energy from the surroundings, generally in the form of heat.
In this process, the surrounding becomes cold after loosing energy.
And here, the surrounding is reaction container and hence, will become cold by loosing its energy to the reaction mixture.
One method that may be used to replace traditional damming is the use of sub-surface dams to prevent the environmental consequences of dams while still harnessing the flowing water.
<h3>What is a sub-surface dam?</h3>
- Just as it sounds, it is a dam that is built underneath the surface.
- The aim is to harness the energy of flowing groundwater.
- This results in less water becoming stagnant, as with traditional dams.
- They also reduce the risk of floods and the rate of evaporation of the water.
- This all results in many positive environmental and ecosystem benefits.
Therefore, we can confirm that the building of a sub-surface dam would result in less water being lost to evaporation, as well as the ecosystem benefits of not completely stopping the flow of water the way a traditional dam does.
To learn more about dams visit:
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