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taurus [48]
3 years ago
14

How does heavy water in a nuclear reactor help to keep the chain reaction going?

Chemistry
1 answer:
yarga [219]3 years ago
4 0
<span>Heavy water acts as a neutron moderator. The neutrons formed by fission come off at high velocity, but U-235 absorbs neutrons much more strongly when they are slowed down, so all so-called thermal reactors use a moderator to slow them down until they achieve the average velocity appropriate to the atoms of the moderator which is at approx 300 deg C in a water reactor. Other moderators can be light water or graphite. Heavy water has the advantage over light water that it absorbs fewer neutrons so natural uranium can be used, whilst light water requires enriched uranium fuel. Graphite in a very pure form is also a good moderator but requires a gas coolant, carbon dioxide has been used in magnox and agr reactors, but there is a time limit on the life of the reactor due to graphite corrosion, and these are now obsolete as far as new builds are concerned. The Soviet RBMK reactors used graphite but with a water coolant inside pressure tubes, but after Chernobyl there will certainly be no more of these built
</span>
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Silver had a density of 10.5 grams per cubic centimeter. What is the mass of 4.0 mL of silver?
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Explanation:

Given parameters:

Density of silver = 10.5g/cm³

Volume of silver given = 4mL

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Mass of silver = ?

Solution:

Density of a substance can be expressed as its mass per unit volume

 Density = \frac{mass}{volume}

 we need to convert our volume to cm³ from mL;

   1cm³ = 1mL

So 4mL = 4cm³

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Darya [45]

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3 0
3 years ago
Question 6(Multiple Choice Worth 5 points)
frez [133]
<span>
1. Which of the following is a part of a land-based carbon cycle?
Trees

Whales, crab shells, and coral reefs would be part of the ocean-based carbon cycle. Trees roles in the carbon cycle are to catch carbon in the atmosphere (in carbon dioxide forms) and do photosynthesize to create carbohydrate. 
Shells are reefs hard skeleton is consist of inorganic carbon that mostly made by CaCO3(calcium carbonate) compound. 


2. X represents a substance in a plant involved in photosynthesis. What is its role?
</span><span>It traps light energy and converts it into chemical energy.
</span>
6CO2 + 6H2O + light energy = C6H12O6 + 6O2.
The main product of photosynthesis is a carbohydrate, which is the main energy source for living organism. From the equation, you can see that A is water and B is carbohydrate.
To produce carbohydrate, photosynthesis needs energy that was provided by the sunlight. The plant has a substance that could convert light into chemical energy called chlorophyll that was stored inside chloroplasts cells. The X above the arrow is chlorophyll<span>.
</span><span>
3. What type of energy transformation takes place when carbon is cycled in a gasoline-based car?
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</span><span>
5. Which of the following processes does not take place during cellular respiration?
Hydrogen of water is separated from oxygen.
</span>
In cellular respiration, the cells using the carbohydrate to produce energy. 
The reaction is similar with photosynthesis with reversed product and reactant.
C6H12O6 + 6O2 --> 6H2O + 6CO2 + ATP.
As you can see in the equation, cellular respiration is not using water but produce it instead. It doesn't produce hydrogen either. <span>



6. Using the above equation, how would you prove the law of conservation of mass?
By showing that the numbers of atoms of the same type are equal on both sides.

</span>The law of conservation of mass state that mass can't be produced. That means the reactant and product mass should be same.
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7. During which of the following processes would carbon most likely be required?
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Glucose is carbohydrate that was made of carbon, hydrogen, and oxygen. Since glucose contains carbon, it is most likely to require carbon to make glucose. 
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Breaking of rocks, generation of electricity, and running of cars need energy that can be gained from various ways.</span>
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