Find the distance travelled by a train travelling at 140 km/h for 6 hours

Answer:

because of their chemical defenses. (more info below)

Explanation:

Skunks have relatively few natural predators of their species. This is a testament to the effectiveness of their chemical defenses. Unfortunately, several skunks are killed when they cross busy roads at night. Deterrence is also not effective against a predator with a poor sense of smell like a Great Horned Owl.

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Answer:

6.97 atm is the osmotic pressure.

Answer:

Please mark me brainliest

Explanation:

The answer is false.

opaque materials do not reflect any light because they absorb or trap all light that comes in contact with them. No light is able to return from within an opaque material or reflect off its inner surface. Opaqueness is defined by a lack of light reflection, transmission or scattering. Light either disappears or is converted into other forms of energy within opaque substances.

Please let me know if this helps explain why opaque materials do not reflect light or if any part of the description is unclear. I can also provide any additional examples or details if needed.

Answer: 19) False. A totally opaque material does not let any light pass through it.

Answer: A saturated solution.

Explanation:

Well, you've definitely made coffee that is too sweet!

But, chemically speaking, a saturated solution is one in which the solution contains the maximum amount of solute that can be dissolved. Any further addition of solute will not be able to dissolve in the solution.

This is exactly what is happening with our cup of coffee. The coffee solution already contains the maximum amount of sugar that can be dissolved, and no amount of stirring will allow the excess sugar to dissolve.

Answer:

C. Fluorine (F) is most likely to form a molecule with sodium that includes one ionic bond. Fluorine is a highly reactive nonmetal, and it tends to gain one electron to form a fluoride ion (F-). Sodium is a highly reactive metal that tends to lose one electron to form a sodium ion (Na+). When these two elements react, they form an ionic compound, sodium fluoride (NaF), which includes one ionic bond between Na+ and F-.

Explanation:

Answer:

To find the volume of the thallium, we can use the formula:

density = mass/volume

Rearranging this formula, we get:

volume = mass/density

Plugging in the given values, we get:

Volume = 3.85g / 11.9 cm^-3

Using a calculator, we can solve for the volume:

Volume = 0.3235 cm^3

Therefore, the volume of the thallium is 0.3235 cm^3.

Explanation:

According to the Foliated Metamorphic Rock Chart slate, phyllite, schist, and gneiss can all have the same parent rock (shale) is a true statement.

Slate, phyllite, schist, and gneiss are all types of metamorphic rocks that can be formed from shale, which is a sedimentary rock composed of clay and other fine-grained minerals. The specific type of metamorphic rock that is formed from shale depends on the conditions under which the shale undergoes metamorphism, including the temperature, pressure, and presence of fluids.

Slate is a fine-grained metamorphic rock with a uniform, flat surface and a layered structure. It is formed when shale undergoes low-grade metamorphism, which occurs at relatively low temperatures and pressures.

Therefore, Gneiss, on the other hand, is a medium- to coarse-grained metamorphic rock with a banded or wavy texture. It is formed when shale undergoes high-grade metamorphism, which occurs at higher temperatures and pressures.

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Answer:2

Explanation:

He

Answer:

Less than 7 ph value are acidic. Greater than 7 ph value are basic.

The position of this equilibrium will be well to the left because ethanolic acid is a weak acid: This gets a lot more ethanoate ions when sodium ethanoate is added to it.

The position of this equilibrium will be well to the left because ethanolic acid is a weak acid: Much more ethanoate ions are added when sodium ethanoate is added. That will shift the equilibrium's position even more to the left, in accordance with Le Chatelier's Principle.

Being a weaker acid or base, buffers act by neutralising any additional base (OH- ions) or acid (H+ ions) to preserve the moderate pH.

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Answer:

In my opinion, 3d is the correct answer.

Answer:

4f

Explanation:

it looks like 4f

Paper used as a writing material is made of pulp (wood).

Paper is a sheet material used for writing on or printing on (or as a non-waterproof container), usually made by draining cellulose fibres from a suspension in water.

Paper is made from cellulose found in trees, which are the main source of cellulose fibre (or woodpulp). Besides woodpulp, paper can be made from other materials such as cotton, flax, esparto, straw, hemp, manilla and jute.

Wood pulp is usually a softwood, used for pulping to make paper.

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Answer:HNO3 + NaOH = NaNO3 + H2O is a neutralization reaction (also a double displacement reaction). The strong acid (HNO3) and strong base react to produce a salt (NaNO3) and water (H2O).Type of Chemical Reaction: For this reaction we have a neutralization reaction. Balancing Strategies: Here is a neutralization reaction. The HNO3 and NaOH combined and form a salt and water.

hope this helps have a nice night ❤️

Explanation:

This exercise is related to the subject of Structured Thinking. See the definition of structured thinking below.

The process of developing a structured framework to address an unstructured situation is known as structured thinking.

Structured thinking is a strategy of problem-solving that entails breaking a huge problem into smaller ones in order to tackle the larger problem more quickly and effectively.

Categorizing things and identifying themes are two subjects under structured thinking.

To categorize anything requires:

Identifying themes entails:

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Answer:

A small amount of chemical splashes in Frank's eye. What should happen next? Frank should go to the eyewash station while his lab partner tells the teacher what happened.

Explanation:

Brainlist

The formula to find the mass in grams is =  number of moles × Molecular mass

A mole is defined as 6.02214076 × 1023 of the chemical unit, be it atoms, molecules, ions, or others as well. The mole is a convenient unit to use because of the great number of atoms, molecules, or others that are present in any substance.

To find number of moles we use the formula that is weight divided by molecular mass

From this we can find out the mass as well;

Mass = Number of moles × Molecular mass

Mass = 3.6 × 98.070 ⇒ 353.08 grams

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Answer:

CaS + 2H2O is the balanced equation

Answer:

\(m_{MgO}=0.239gMgO\)

Explanation:

Hello,

In this case, the chemical reaction between magnesium and oxygen to yield magnesium oxide is:

\(2Mg+O_2\rightarrow 2MgO\)

In such a way, for 0.144 g of magnesium reacting with sufficient oxygen, the mass of magnesium oxide, whose molar mass is 40.3 g/mol (2:2 mole ratio) turns out:

\(m_{MgO}=0.144gMg*\frac{1molMg}{24.3gMg} *\frac{2molMgO}{2molMg}* \frac{40.3gMgO}{1molMgO} \\\\m_{MgO}=0.239gMgO\)

Best regards.

The amount of time of contact, the area of contact, and the specific heats of the substances. Hence, option A is correct.

The heat in calories is required to raise the temperature of one gram of a substance one degree Celsius.

Factors that affect the rate of heat flow include the conductivity of the material, the temperature difference across the material, the thickness of the material, and the area of the material.

Different materials have greater or lesser resistance to heat transfer, making them better insulators or better conductors.

The amount of time of contact, the area of contact, and the specific heats of the substances.

Hence, option A is correct.

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Answer: The answer is C and D

B: If a substance undergoes a physical change, then it will retain most of its original properties because no new substance is formed.

C: If a substance undergoes a chemical change, then it will not retain its original properties because a new substance is formed.

Explanation: I took the test on edg

Answer:

The methane gas burns

Explanation:

The burning of methane gas is a combustion reaction. Combustion is an exothermic process. For all exothermic processes, ∆H is negative.

Combustion reaction involves the evolution of heat. The energy of reactants is greater than the energy of products hence the excess energy is given off in the form of heat leading to a negative value of the enthalpy of reaction, hence the answer.

It is clear from the balanced chemical  equation, that two  moles of ammonia decompose to give one mole of nitrogen gas. Then, 4.52 moles will give 2.26 moles of nitrogen gas.

Ammonia is an inorganic gas formed by the combination of nitrogen gas and hydrogen gas. It is a reversible reaction and the ammonia gas can be decomposed to given the hydrogen and nitrogen gases as written below:

\(\rm 2NH_{3}\rightarrow 3H_{2} + N_{2}\)

As per the balanced chemical equation of the decomposition of ammonia gas, it is clear that, 2 moles of ammonia gives on mole of N₂.

Then 4.52 moles of ammonia will give,

4.52 / 2 = 2.26 moles of N₂.

Therefore, 2.26 moles of N₂ is produced from 4.52 moles of NH₃.

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Answer:

0.5 g

Explanation:

Given data:

Half life of radioactive material = 30 days

Total mass = 4 gram

Mass left after 90 days = ?

Solution:

Number of half lives passed:

Number of half lives = Time elapsed / half life

Number of half lives = 90 days / 30 days

Number of half lives = 3

At time zero = 4 g

At first half life = 4g/2 = 2 g

At 2nd half life = 2g/ 2= 1 g

At 3rd half life = 1 g/2 = 0.5 g

The mass of water produced by the reaction of the 23 g of \(SiO_2\)  is 13.8 g.

The given chemical reaction;

\(4Hf (g) \ + \ SiO_2 (s) \ --> \ SiF_4(g) \ + \ 2H_2O(l)\)

In the given compound above, we can deduce the following;

60 g of \(SiO_2\)  --------- 36 g of water

23 g of \(SiO_2\)  ------------- ? of water

\(mass \ of \ water = \frac{23 \times 36}{60} = 13.8 \ g \ of \ water\)

Thus, the mass of water produced by the reaction of the 23 g of \(SiO_2\)  is 13.8 g.

In the reaction of the given compound, \(4Hf (g) \ + \ SiO_2 (s) \ --> \ SiF_4(g) \ + \ 2H_2O(l)\), what mass of water (in grams) is produced by the reaction of 23.0 g of SiO2?

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Answer:

God will help you and has a plan for you. Please don't cheat or look up answers. I used to be like you but I stopped. God always has a plan for you! Just remember this. He loves you. Share the message

Explanation:

Answer:well your in collage so figure it and suck to be you

Explanation:

XD

Ratio of moles of NH₃ produced to moles of N₂ used: 2 moles of NH₃ / 1 mole of N₂

Ratio of moles of NH₃ produced to moles of H₂ used: 2 moles of NH₃ / 3 moles of H₂

From the balanced chemical equation:

N₂ + 3 H₂ ⟶ 2 NH₃

We can determine the ratio of moles of products to the moles of each reactant.

Ratio of moles of NH₃ produced to moles of N₂ used:

From the balanced equation, we can see that 1 mole of N₂ reacts to produce 2 moles of NH₃. Therefore, the ratio is:

2 moles of NH₃ / 1 mole of N₂

Ratio of moles of NH₃ produced to moles of H₂ used:

From the balanced equation, we can see that 3 moles of H₂ react to produce 2 moles of NH₃. Therefore, the ratio is:

2 moles of NH₃ / 3 moles of H₂

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Given the equation of reaction;

N₂ + 3 H₂ ---> 2 NH₃

Calculate the ratio of the moles of produced to the moles of each of the reactants used. (Write two separate ratios.)

Answer:

3.2877204

Explanation:

Answer:

0.409 mol

Explanation:

The formula to find he number of moles is:

No. of moles = \(\frac{mass}{Mr}\)

Mr of MgBr₂ = 24.3 + (79.9 × 2) = 184.1

Mass = 75.25g

So, no. of moles = \(\frac{75.24}{184.1}\)

No. of moles = 0.409 mol [to 3 significant figures]