Which of the following elements is often used as a reactant in a nuclear fission reactor?

A. Hydrogen
B. Uranium
C. Carbon
D. Boron

Answer:

To produce 1 mole of N2O required 1 mole of NH4NO3 . Hence, 60 grams of NH4NO3 are required to produce 33.0 g N2O

Explanation:

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Answer:

keep it from being washed away by water

The enthalpy change of the given reaction is negative, so the reaction is an exothermic reaction.

Enthalpy change of a reaction is the energy changes that occur when reactant molecules form products.

Enthalpy is the heat content of a substance.

When enthalpy change is positive, the heat content of the product is greater than that of the reactant and the reaction is an endothermic reaction.

Whereas, when enthalpy change is negative, the heat content of the reactant is greater than that of the product and the reaction is an exothermic reaction.

Therefore, since the enthalpy change of the given reaction is negative, the reaction is an exothermic reaction.

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Answer:

Cause why not?

Explanation:

There are a lot you want to know about heat transfer.

If u understand the mode of heat transfer well, then heat transfer is easy to continue.

Answer:

1: They give to the body Vitamin  D 2: they give solar energy and that is what gives us revaluation around the sun (Drag) 3: it gives plants energy for photosynthesis (or dont know)

4:solar panels gives energy by the sun radio controlled area that gives us the battery's, lights etc...

Explanation:

EXPLAIN IT

Answer:

A. O, S, Se

Explanation:

They are all considered "other nonmetals," found in row 16 of the periodic table, and are chalcogens. The other options don't have as much in common.

The statement about the number of moles of acid and base being the same is true in the neutralisation reaction between the acid HCl and base NaOH.

A neutralisation reaction is the type of chemical reaction whereby an acid reacts with a base to form salt and water.

HCl + NaOH --------> NaCl + H2O

In the neutralisation reaction, between the acid HCl and base NaOH above, the balanced chemical equation showed that the initial number of moles of acid is equal to the final amount of the number of moles of known base which is NaOH.

Therefore, the statement about the number of moles of acid and base being the same is possible in the neutralisation reaction between the acid HCl and base NaOH.

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https://brainly.com/question/11158730

Explanation:

1. Reduce your carbon footprint

Carbon emissions also increase ocean acidity, which can impact corals and the species that depend on them.

Walking, biking, riding public transportation and carpooling are all ways you can reduce your carbon footprint

2. Conserve water to reduce pollution

All water winds up in the ocean, and pollution drives much of the damage to reefs. And runoff is what carries nutrients and contaminants into the sea.

Using less water can help minimize these impacts.

3. Get engaged

Through civic and political engagement, you can help shape your community in ways that reduce negative impacts on coral reefs. Volunteering, voting and running for public office are all ways you can become more engaged and magnify your impact on a wide range of issues.

4. Support sustainable fishing

Overfishing has a dramatic impact on coral reefs. By making informed choices about the fish you purchase and eat, you can contribute greatly to ocean health.

5. Support sustainable development and tourism

By doing research, speaking out and making informed choices when you visit tropical reefs, you can make a big impact

6. Help inform the public

Educating others about the crisis facing coral reefs is a vital part of building support, engagement and the political will to fight the human-caused pressures that are devastating reef ecosystems.

Answer:

1.23 moles

Explanation:

Ideal gas law

PV = n RT                 R = .082057 L-atm/mol-K

25 C = 298.15 K

12 (2.5) = n (.082057) (298.15)      n = 1.23 moles

Answer:

D.) 2,200 kJ

Explanation:

To find the energy needed to vaporize aluminum, you need to multiply the given mass (2 kg) by the latent heat of vaporization conversion (via table). You know your answer is correct if the units cancel out.

2 kg aluminum                1,100 kJ
-------------------------  x  ------------------------  = 2,200 kJ
                                   1 kg aluminum

**I apologize if there was another way using the equation **

From the calcuation, the percent ionic character of the bond is  70%

The term percent ionic character has to do with the degree of ionic bonding that is contained in a compound. It can be estimated from the electronegativity of each element.

We can use the formula; 100(1 - e^(-ΔEN² / 4))

EN = χB − χA * 100/1

EN = 3.5 - 1.5 = 1

100(1 - e^(-1)^2/4)

= 70%

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Answer: 25

Explanation:

The electronegativity of a  C

 atom is 2.5, and the electronegativity of an  O

 atom is 3.5. The absolute value of the electronegativity difference is

electronegativity difference= |2.5−3.5|
                                               = 1.0 = 25%

Note the trend between the points in the bottom left region of the chart. According to this trend, the percent ionic character of a bond with a dipole moment 1.0 is approximately 25 %

Answer:

the phenotype of TT is the right answer

Answer:

Explanation:

No density does not change when the volume changes unless something is added to the 5 cm^3.

The answer is False

Answer:

Explanation:

Use context clues to write your own definition for each meaning of the word matter.

Example sentence

What is this gooey matter on the table?

Matter:

__________

Example sentence

Please vote! Your opinions matter.

Matter:

__________

Winds and ocean currents are evidence for the process of regulating and stabilizing the climate patterns.

Ocean current is the flow or movement of water in a direction by gravity, wind, and difference in density of the water.

Wind currents pull water and create ocean currents. The current flow to westwards, which is called Coriolis effect.

Thus, Winds and ocean currents are evidence for the process of regulating and stabilizing the climate patterns.

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Answer:

Six step guide to help you solve problems

Step 1: Identify and define the problem. State the problem as clearly as possible. ...

Step 2: Generate possible solutions. ...

Step 3: Evaluate alternatives. ...

Step 4: Decide on a solution. ...

Step 5: Implement the solution. ...

Step 6: Evaluate the outcome

Answer:

1.94 Moles H2O

Explanation:

1 grams Water to mol = 0.05551 mol

so 35 x 0.05551 = 1.9427952271627198, which rounds to 1.94 moles

Answer:

All living cells release energy from food  molecules through cellular breathing and/or fermentation. Some cells make food molecules using light energy through the process of (making food from light).

Making food from light- Photosynthesis

Breathing- Respiration

All living units give out power for a given time from food small complex units through formed of small units breathing and or fermentation. Some units make food small complex units using light power for a given time through the process of (making food from light).

Answer:

smoke from a fire Is not an example of energy

The molarity of a solution that contains 4.9 g of [tex]H_2SO_4[/tex] in 400 ml of solution would be 0.12465 M

Define molarity of a solution.

Molarity (M) is the amount of a substance in a certain volume of solution. Molarity is defined as the moles of a solute per litres of a solution. Molarity is also known as the molar concentration of a solution.

Mathematically,

[tex]Molality = \frac{Moles \;solute}{olume \;of \;solution \;in \;litre}[/tex]

Mole of 4.9 g [tex]H_2SO_4[/tex]

= [tex]\frac{mass}{molar \;mass}[/tex]

= [tex]\frac{4.9 g}{98.08}[/tex]

= 0.0499

[tex]Molality = \frac{Moles \;solute}{ olume \;of \;solution \;in \;litre}[/tex]

[tex]Molality = \frac{ 0.0499}{0.4}[/tex]

= 0.12465 M

Hence, the molarity of a solution that contains 4.9 g of [tex]H_2SO_4[/tex] in 400 ml of solution would be 0.12465 M.

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Answer:

0.1M

Explanation:

Using Neutralisation formula,

MaVa=MbVb

>>(0.25)(40)=Mb(100)

Mb=0.1M

Some processes that shape the Earth are happening so slowly they cannot be easily detected in a human's lifetime.

This is the third planet from the Sun and is characterized by its plants and animal life.

This planet have some processes which occur slowly and aren't easily detected unlike the rapid ones.

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Answer:

pV= nRT

Explanation:

(p1 × V1)/ T1/ (p2 × V2)/ T2