4. What mass of urea is produced from 9.0 liters of ammonia?
The reaction is 2NH3(g) + CO2(g) → H2NCONH2(g) + H2Og)

Answer:

D.  Food poisoning, Bacteria Vomiting, loose stools

Answer:

2Na + K₂S → 2K + Na₂S. "replacement reaction"

Explanation:

To balance the equation, you should apply the law of conservation of mass for the equations.

The law of conservation of mass states that the no. of each atom is equal in both sides (reactants and products).

So, the given equation is balanced as:

2Na + K₂S → 2K + Na₂S.

It is a replacement reaction that Na replace K in K₂S.

That 2.0 moles of Na react with 1.0 mole K₂S to produce 2.0 of K and 1.0 mole of Na₂S.

Na (2), K (2), and S (1).

8820 and 0.0882 have three sig figs

When a number has zeros in it I struggled a lot to determine if it what a sig fig or not. This is how I remember it:

If a zero is a sandwich between normal numbers it IS a sig fig

Zero's after the decimal ARE sig figs

***IMPORTANT! There is an exception to this one which I'll talk about next :)

Leading zeros (I believe that is what they are called) are NOT sig figs. This would be like the zeros in the following numbers:

0.2

0.03

0.000000000000000000006

If there are zeros after normal numbers and there is NO DECIMAL it is NOT a sig fig.  This would be like the zeros in the following numbers:

630

3, 000

536, 329,600,000

Take a look at the other numbers:

0.8820 <<<This has 4 sig. figs.

882.0 <<<This has 4 sig. figs.

***Remember that if there is a pure decimal the zero in front of the decimal is NOT a sig fig and just a place holder. It isn't necessary and can always be taken away

Hope this made sense and helped!!!

The 8820 m and 0.0882 m have three significant figures

There are rules are to be applied to determine the significant figures in a suitable quantity.

Example : 23 cm ,2.3 cm , and 0. 23 cm all have two significant figures.

Example: 0.033 has two significant figures and 0.00172 has three significant figures.

Example: 6601 has four significant figures.

Example: 8.00 has three significant figures and 0.070 has two significant figures.

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we have

work done (W)= force(F) × displacemen(s)

or, 80= F× 8

or, F= 10 N

therefore, 10 N force is required to lift the rock.

Final answer:

To calculate the force needed to lift a rock 8 m when 80 J of work is done, use the formula W = F × d, resulting in a force requirement of 10 N.

Explanation:

To find out how much force is required to lift a rock a vertical distance of 8 m when 80 J of work were done, we can use the relationship between work done, force, and distance. The work done when lifting an object is defined by the formula W = F × d, where W is the work, F is the force, and d is the distance. In this case, W = 80 J and d = 8 m. By rearranging the formula to solve for F, we get F = W/d. Therefore, the force required to lift the rock is F = 80 J / 8 m = 10 N.

Answer:

50.0 g.

Explanation:

Thus, the amount of radioactive isotope is 50.0 g.

We want to find how much of a radioactive isotope we will have after a given time, given that we know the half life of the isotope.

After 10 years, there will be 50 grams of the isotope.

The half life of a given quantity is defined as the time such that the quantity is reduced ot its half.

So if we initially have a quantity A with a half time T, after the time T our quantity will be A/2.

Now we have 100 g of a radioactive isotope with a half life of 10 years. Then after that time, 10 years, we will have half that mass of isotopes.

This is 100g/2 = 50g

After 10 years we will have 50 grams of isotopes.

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Answer:

153.8 g/mol.

Explanation:

The molar mass of a compound = ∑ atomic masses of atoms.

∴ The molar mass of CCl₄ = 1(atomic masss of C) + 4 (atomic mass of Cl) = (12.0 g/mol) + 4 (35.45 g/mol) = 153.8 g/mol.

Answer:

c

Explanation:

because the fire gives off radiation

The atmosphere is a bunch of air/gases that protect the Earth. Nothing living is included in the atmosphere. Therefore the answers are...

Protects Earth's surface

Contains a mixture of gases and particles

Hope this helped!

Answer: protects Earth’s surface

contains a mixture of gases and particles

includes organisms in the air, on land, and in water

Explanation:

An atmosphere is the layer of gases that surrounds the earth. It is composed of air masses that consists of variety of gases like water vapor, oxygen, nitrogen, and carbon dioxide. It also consists of particles of dust and pollutants.

The function of the atmosphere is to protect the earth surface from the incident infrared rays and ultraviolet rays coming from the sun. The atmosphere covers the land and water region. Therefore, the lives of organisms that survive in air, land and water depends on the atmosphere.

The major concern for the Union government offices during the war was that the Confederate states managed to win a battle in very close proximity to their capital Washington. The fact that the Confederate forces were so close to Washington, and the defenses of the capital were very strong at the moment, while the majority of the soldiers were at other locations and needed time to get back to defend it. This was bringing a big concern because if Washington was captured by the Confederate forces then the Union would have been in big trouble and suffer badly because of it.

Answer:

Moving battles farther up the Northeast coast

Explanation:

There are numerous types of storms, each of them having their own unique characteristics, and unfortunately all of them being able to cause a lot of damage. Some of them are:

- Derecho storms

These are series of storms that stretch for over 240 mph. They have winds of over 58 mph, and they are very unpredictable.

- Flooding

The flooding occurs when there's excessive rainfall that over-saturates the water bodies and the soil with water, causing floods.

- Hail storm

They occur in the warm periods, coming in the shape of circular-shaped ice stones. This type of storm causes lot of damage through the power of the ice stones.

- Snow storm

The snow storms occur in the cold periods. They are excessive snowfalls, often accompanied with strong winds, managing to pile up enormous amounts of snow in a short period of time.

- Hurricanes

They are one of the most dangerous storms. They bring in lot of rainfall, but also very strong winds that manage to pull out trees, vehicles, and damage houses.

Answer:

7.4.

Explanation:

∵ pH = -log[H₃O⁺].

∴ pH = -log(2.5 x 10⁻⁷) = 6.6.

∵ pH + pOH = 14.

∴ pOH = 14.0 - pH = 14.0 - 6.6 = 7.4.

Q, R, S, P is the order of apparent magnitude of the stars, starting from the least to the greatest.

Answer: Q, R, S, P

Explanation:

The apparent magnitudes of the star is the brightness calculated by an observer at a particular distance from the Earth. The smaller the distance between the star and the Earth, the greater the apparent brightness.

So , from the given distance (in light years), Q,R,S,P is the answer (least to the greatest apparent magnitude) (distance is greatest to least).

Answer:

Q, R, S, P is the order of apparent magnitude of the stars, starting from the least to the greatest.

Answer: Q, R, S, P

Explanation:

Answer:

The gold sample will experience a greater increase in temperature.

Explanation:

Q = m.c.ΔT,

where, Q is the amount of heat absorbed by substance.

m is the mass of the substance.

c is the specific heat of the substance.

ΔT is the difference between the initial and final temperature.

∴ ΔT = Q /(m.c)

It is clear that ΔT is inversely proportional to the specific heat capacity of the object.

So, the object with the smallest specific heat capacity (gold) will have the greater increase in temperature.

For gold:

ΔT = Q /(m.c) = (25 cal)/(5.0 g)(0.03 cal/g°C) = 166.7°C.

For iron:

ΔT = Q /(m.c) = (25 cal)/(5.0 g)(0.11 cal/g°C) = 45.45°C.

The gold sample will experience a greater increase in temperature.

Answer:

The gold sample will experience a greater increase in temperature.

Explanation:

Answer:

1.282 M.

Explanation:

M = (no. of moles of solute) / (V of solution (L))

M = (mass/molar mass)of NaCl / (V of solution (L))

mass of NaCl = 41.2 g, molar mass of NaCl = 58.44 g/mol, V of solution = 550 mL = 0.55 L.

∴ M = (mass/molar mass)of NaCl / (V of solution (L)) = (41.2 g / 58.44 g/mol) / (0.55 L) = 1.282 M.

Answer:

Dead fish, birds, dolphins, and many other animals often wind up on beaches, killed by pollutants in their habitat.

Answer:

sun

Explanation:

Final answer:

A moon orbits a planet, and a planet orbits the Sun, completing the analogy and indicating 'Sun' is the correct answer to fill in the blank.

Explanation:

The question requires drawing an analogy between celestial bodies based on their relationships within the solar system. A moon orbits a planet, and similarly, a planet orbits something else. The best answer to what a planet orbits is the Sun, which is at the center of our solar system.

We know that all the planets in our solar system, including Earth, revolve around the Sun. This is due to the Sun's gravitational pull, which keeps the planets in their respective orbits. Likewise, moons, including Earth’s moon, orbit their respective planets due to the gravitational pull of these planets.

Therefore, the analogy completes as follows: Moon is to planet as planet is to Sun. The correct choice is B. Sun.

Answer:

Scientific laws aka the laws of science are statements that are based off of repeated experimentation and/or observations.

Explanation:

Hooke's Law of Elasticity is the principle of physics that states that the force needed to extend or compress a spring by some distance is proportional to that distance.

Answer :

C - The oldest layers of rock lie below newer layers of rock on Earth.

Answer:

C) 10,500 years.

Explanation:

The integration law of a first order reaction is:

kt = ln [A₀]/[A]

k is the rate constant = 1.314 x 10⁻⁴ year⁻¹.

t is the time = ??? years.

[A₀] is the initial percentage of cobalt-60 = 25.0 g.

[A] is the remaining percentage of cobalt-60 = 6.25 g.

∵ kt = ln [Ao]/[A]

∴ (1.314 x 10⁻⁴ year⁻¹)(t) = ln (25.0 g)/(6.25 g)

(1.314 x 10⁻⁴ year⁻¹)(t) = 1.386.

∴ t = 1.386/(1.314 x 10⁻⁴ year⁻¹) =  10,550 years ≅ 10,500 years.

Answer:

answer is c

Explanation:

Answer:

1.3 L.

Explanation:

M = (no. of moles of CaSO₄)/(Volume of the solution (L))

M = 0.352 M.

no. of moles of CaSO₄ = mass/molar mass = (62.1 g / 136.14 g/mol) = 0.456 mol,

Volume of the solution = ??? L.

∴ (0.352 M) = (0.456 mol)/(Volume of the solution (L))

∴ (Volume of the solution (L) = (0.456 mol)/(0.352 M) = 1.296 L ≅ 1.3 L.

Answer:

2KClO₃ → 2KCl + 3O₂. "decomposition reaction"

Explanation:

2KClO₃ → 2KCl + 3O₂.

It is a decomposition reaction that 1.0 reactant is decomposed to 2 products.

That 2.0 mole of KClO₃ are decomposed to produce 2.0 moles of KCl and 3.0 moles of O₂.

K (2), Cl (2), and O (6).

The answer is:

The percent yield of the reaction is 32.45%

To calculate the percent yield, we have to consider the theoretical yield and the actual yield. The theoretical yield as its name says is the yield expected, however, many times the difference between the theoretical yield and the actual yield is notorious.

We are given that:

[tex]ActualYield=37.6g\\TheoreticalYield=112.8g[/tex]

Now, to calculate the percent yield, we need to divide the actual yield by the theoretical and multiply it by 100.

So, calculating we have:

[tex]PercentYield=\frac{ActualYield}{TheoreticalYield}*100\\\\PercentYield=\frac{37.6g}{112.8g}*100=0.3245*100=32.45(percent)[/tex]

Hence, we have that the percent yield of the reaction is 32.45%.

Have a nice day!

We need to find what percent 37.6 is out of 112.8 .

First find what fraction of 112.8 it is:  (37.6/112.8) = 1/3

Change the number to a percentage:  (1/3 x 100) = (33 and 1/3) %

Answer: The molarity of the solution comes out to be 19.19 M.

Explanation:

We are given:

99% m/m . This means that 99 grams of sulfuric acid is present in 100 grams of solution.

Density of solution = 1.9 g/mL

To calculate the volume of the solution, we use the equation:

Density of solution = 1.9 g/mL

Mass of solution = 100 g

Putting values in above equation, we get:

To calculate the molarity of a solution, we use the equation:

Given mass of sulfuric acid = 99 g

Molar mass of sulfuric acid = 98g/mol

Volume of solution = 52.63 mL

Putting values in above equation, we get:

Hence, the molarity of the solution comes out to be 19.19 M.

Answer:

Keq = [H₂]⁴[CSe₂]/[CH₄][H₂Se]².

Explanation:

CH₄(g) + 2H₂Se(g) ⇄ 4H₂(g) + CSe₂(g).

∴ Keq = [products]/[reactants] = [H₂]⁴[CSe₂]/[CH₄][H₂Se]².

Answer: 6.25 L (6L if sig figs)

Explanation:

The relationship between pressure and volume is inverse when temperature is constant, where P1V1=P2V2

P1 = 100

P2 = 40

V1 = 2.5

Plug in to get 100(2.5) = 40v2

Solve for v2 = 250/40 = 6.25 L

This makes sense because if the pressure decreases the volume increases.

if your teacher has you do sig figs and you kept the sig figs from the problem, then there should be 1 sig fig (from 40 kPa) so the answer would be 6 L.

The volume of the gas when temperature is constant is 6.25 L.

Relation between the pressure and volume of the gas by using the ideal gas equation will be represented as:

P₁V₁ = P₂V₂, where

P₁ & V₁ are the initial pressure and volume.

P₂ & V₂ are the final pressure and volume.

On putting values from the question, we get

V₂ = (100)(2.5) / (40) = 6.25 L

Hence required volume is 6.25 L.

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Explanation:

Plato (This message is here to bypass the word limit thingy)

Answer:

I believe the answer is 0.100.

Explanation:

Hope my answer has helped you!

Final answer:

To find the number of moles in 200 ml of a 0.500 M solution, convert the volume to liters (0.200 L) and multiply by the molarity to get 0.100 moles of solute.

Explanation:

To calculate the number of moles of solute in a 200 ml solution with a molarity of 0.500 M, you would use the formula:

Number of moles (mol) = Molarity (M)× Volume (L)

First, it is critical to convert the volume from milliliters to liters, knowing that there are 1000 ml in a liter:

Next, you would use the given molarity of the solution to determine the moles of solute:

So, the solution contains 0.100 mol of solute.

Answer:rubidium is the second most reactive metal so it is more reactive than hydrogen

Explanation:

Final answer:

Rubidium is more reactive than hydrogen, especially when reacting with water. It is part of the alkali metals that are highly reactive due to their position in the periodic table, while hydrogen, despite its reactivity, is less reactive with water and forms covalent compounds.

Explanation:

Between rubidium and hydrogen, rubidium is more reactive when it comes into contact with water. This is demonstrated by the vigorous and instantaneous reaction that occurs when rubidium solid is added to water, often resulting in an explosion. This reactivity is due to its position in the periodic table as an alkali metal, which are known for their high reactivity with water. In contrast, hydrogen, although reactive with some elements, has a lower reactivity towards water and forms covalent compounds with various elements.

The chemical equation 2 Rb(s) + 2 H₂O(l) → 2 RbOH(aq) + H₂ (g) depicts this reaction more accurately than a reaction in equilibrium with a low concentration of hydronium ions, as it conveys the fast and vigorous nature of the interaction between rubidium and water. The alkali metals, which include lithium, sodium, potassium, rubidium, cesium, and francium are part of Group 1 of the periodic table and are known for their reactivity, especially with water.

Answer:

3CaCl₂ + 2Na₃PO₄ → Ca₃(PO₄)₂ + 6NaCl.

Explanation:

3CaCl₂ + 2Na₃PO₄ → Ca₃(PO₄)₂ + 6NaCl.

Ca replaces Na in (Na₃PO₄ ) and forming Ca₃(PO₄)₂.

Na replaces Ca in CaCl₂ and forming NaCl.

So, the products of this reaction are Ca₃(PO₄)₂ and NaCl.

This is often argued over, but most people agree it is somewhere within the 200s. So I think 250 is your best bet.

Yes I agree, the answer is C) 250 grams since the average human body contains around 200 grams.

Answer:

Heat flows from the coffee to the spoon through conduction

Explanation: I took did the lab assignment

Heat flows from the coffee to the spoon through conduction. Therefore, option C is correct.

Conduction is one of the three main modes of heat transfer, alongside convection and radiation. It refers to the transfer of heat energy through direct contact between objects or substances that are at different temperatures.

Conduction occurs more efficiently in materials that are good conductors of heat, such as metals, which have closely packed atoms and free electrons that can easily transfer thermal energy. Materials with poor conductivity, such as insulators like wood or plastic, impede the transfer of heat by conduction.

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Your question is incomplete, most probably the full question is this:

Which statement describes how heat flows from the coffee to the part of the spoon in the coffee?

A. Heat flows from the coffee to the spoon through radiation.

B. Heat flows from the coffee to the spoon through convection.

C. Heat flows from the coffee to the spoon through conduction.

D. Heat flows from the coffee to the spoon through radiation, convection, and conduction.