Sea water is classified as a
a) Alloy.
b) Solution.
c) Mechanical mixture.
There should be D, though if the answer is not on here please let me know. I really need this. Thank you!

The mass of SnCl₂ in a solution with a volume of 100 mL and a concentration of 0.500 M is 47.6 grams (to 3 significant figures).

To calculate the mass in grams of SnCl₂ in a solution, we will use the formula:

Mass = volume x concentration x molar mass

We are given the volume of the solution as 100 mL and the concentration as 0.500 M. To calculate the molar mass of SnCl₂ , we add the atomic masses of tin (Sn) and chlorine (2 x Cl):

Molar mass of SnCl₂ = 119.01 g/mol (Sn = 118.71 g/mol; Cl = 35.45 g/mol)

Now we can substitute the values we have into the formula:

Mass = volume x concentration x molar mass

= 100 mL x 0.500 M x 119.01 g/mol

= 5950.5 g/mol

This answer is in grams per mole, so we need to convert it to grams by dividing by the Avogadro constant (6.022 x 10^23):

Mass = 5950.5 g/mol ÷ (6.022 x 10^23 mol^-1)

= 9.897 x 10^-21 g

Finally, we can express our answer in a more useful form by rounding to 3 significant figures:

Mass = 47.6 g.

Therefore, the mass of SnCl₂ in a solution with a volume of 100 mL and a concentration of 0.500 M is 47.6 grams (to 3 significant figures).

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Answer:

C

Explanation:

science is basically must base on the

evidence and experiment which

alchemy usually don't do these things

Alchemy was unscientific in its practices as It was not based on evidence and experiment. Hence , Option (C) is correct

A medieval chemical science and speculative philosophy aiming to achieve the transmutation of the base metals into gold, the discovery of a universal cure for disease, and the discovery of a means of indefinitely prolonging life.

Therefore , Alchemy was unscientific in its practices as It was not based on evidence and experiment. Hence , Option (C) is correct

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Elements from place theory and geoheritage can be used in the conservation of a natural resource. Place theory emphasizes the cultural and emotional connections between people and places, while geoheritage focuses on the geological and ecological values of an area. Incorporating these elements in conservation efforts can help raise awareness, foster a sense of belonging, and highlight the intrinsic value of the natural resource, leading to better stewardship and preservation.

Place theory recognizes that people develop a connection with specific places due to their cultural significance, history, and personal experiences. By incorporating place-based approaches in the conservation of a natural resource, such as highlighting the cultural and historical importance of the area, it can foster a sense of attachment and pride among local communities. This can lead to increased support and engagement in conservation initiatives.

Geoheritage, on the other hand, focuses on the geological and ecological values of a specific area. Understanding the geological processes, unique landforms, biodiversity, and ecological significance of a natural resource can provide a strong scientific foundation for its conservation. By emphasizing the geoheritage values, such as rare geological formations or endangered species habitats, conservation efforts can be targeted towards preserving these specific features.

By combining elements from place theory and geoheritage, conservation efforts can encompass both the cultural and scientific aspects of a natural resource. This holistic approach not only enhances the understanding and appreciation of the resource but also promotes sustainable management practices for its long-term conservation.

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Answer:

the activity of radioactive isotopes decreases the more days increased

Explanation:

Answer:

According to the activity series of metals, a metal can replace another metal in a compound if it is more reactive than that metal. The more reactive metal will form a compound, while the less reactive metal will be displaced as a free element. So, the reaction that will not take place is the one in which the metal is less reactive than the one in the compound.

Looking at the given reactions, the reaction that will not take place is 2NaCl + Ca → CaCl2 + 2Na. This is because calcium (Ca) is more reactive than sodium (Na) on the activity series of metals, which means that it can replace sodium in a compound. Therefore, calcium will react with sodium chloride (NaCl) to form calcium chloride (CaCl2) and sodium (Na) as a free element. However, the given reaction shows sodium (Na) displacing calcium (Ca), which is not possible according to the activity series of metals.

Answer: Reactions 1 and 3 will not take place

Zn + MgCl2 → Mg + ZnCl2 - Reaction 1

Li + AgNO3 → Ag + LiNO3 - Reaction 2

2NaCl + Ca → CaCl2 + 2Na - Reaction 3

Pb(NO3)2 + Ni → Ni(NO3)2 + Pb - Reaction 4

Explanation: In the Reactivity Series, Magnesim(Mg) has a higher reactivity tha Zinc so it should be that there is no reaction whereas in reaction 3, Sodium has a higher reactivity than Calcium so no reaction happens

Answer:

a one rotation of the planet on its axis

Explanation:

The two types of motion that planets undergo are;

1) rotation of the planet about its axis

2) revolution of the planet around the sun.

In every planet there are days as shown in the image attached to the question. However, the length of day in each planet is determined by the time required for the planet to complete one rotation on its axis.

It takes the earth 1 earth day (24 hours) to complete rotation on its axis.

Answer:

3

Explanation:

Number of Energy Levels: 3

First Energy Level: 2

Second Energy Level: 8

Third Energy Level: 7

* Please do not just copy my answer it was meant to help you not just give you anything to put down!!

* if you think my answer is good or will get you A please give me brainiest or five stars.

*love yourself. You’re beautiful, :) I promise

*Please treat people with kindness, wear a mask, and have a lovely day.

All statements given in the question are incorrect except for 1 statement. The correct statement is:1 s = 10^3 ms.

In the question, we have been provided with 5 statements. We are asked to select all the correct statements from those 5 statements. Given below are for each statement:1 g = 10^3 mg:This is incorrect. 1 g is equal to 1000 mg.10^-3 g = 10^12 ng:This is incorrect. 10^-3 g is equal to 1 mg.1 km = 10^5 mm:This is incorrect. 1 km is equal to 1,000,000 mm.1 s = 10^6 μs:This is incorrect. 1 s is equal to 1,000,000 μs.1 s = 10^3 ms:This is correct. 1 s is equal to 1000 ms.Therefore, the main answer to this question is that only 1 statement is correct, which is:1 s = 10^3 ms.

Metric units are based on the power of ten. The base units of the International System of Units (SI) are the meter, kilogram, second, kelvin, ampere, mole, and candela. All other metric units can be derived from these basic units.The first unit in each conversion is in grams, seconds, or kilometers. The metric units for millimeters, microseconds, and nanograms are derived from these basic units. One gram is equal to 1000 milligrams (mg), 1 second is equal to 1000 milliseconds (ms), and 1 kilometer is equal to 1000000 millimeters (mm). 10^-3 g is equal to 1 milligram (mg), 10^6 μs is equal to 1 second (s), and 10^12 ng is equal to 1 gram (g).

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Take 23mols and multiply it by the atomic mass of Li:

23mol  * 6.94g/mol = 159.62g

Answer: Psilocybin (4-phosphoryloxy-N, N-dimethyltryptamine) is the active chemical in certain mushrooms that causes hallucinogenic effects.

Explanation:

An active chemical in certain mushrooms that causes hallucinogenic effects is psilocybin.

Some types of mushrooms, referred to as "magic mushrooms," contain psilocybin.

This chemical molecule, when consumed, is changed into psilocin, which causes the hallucinogenic experiences seen by users.

Mushrooms provide protein, vitamins, minerals, and antioxidants. These might offer several health benefits.

For instance, antioxidants are chemicals that help the body eliminate free radicals.

Free radicals are unfavourable byproducts of metabolism and other biological processes. If they accumulate, oxidative stress could start to appear in the body. This can harm the body's cells and result in a variety of diseases.

Some of the antioxidants found in mushrooms include the following:

Choline, selenium, and vitamin C.

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As a result, oxygen exerts a pressure of 0.5 atm.

1013.25 mbar is the atmospheric pressure at sea level (under normal atmospheric circumstances). Here, nitrogen (78.08% vol), oxygen (20.95% vol), argon (0.93% vol), and carbon dioxide (0.040% vol) make up the majority of the dry air.

If nitrogen is responsible for 90% of the total pressure, oxygen is responsible for the remaining 10%.

First, let's calculate the pressure that nitrogen exerts:

Pressure of nitrogen = 90% of total pressure

= 0.9 * 5.0 atm

= 4.5 atm

Now, we can find the pressure exerted by oxygen:

Pressure of oxygen = 10% of total pressure

= 0.1 * 5.0 atm

= 0.5 atm.

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Answer:

PbO = lead oxide G

FeO2 Iron (iv) oxide T

Fe(OH)3 iron(iii) hydroxide H

Pb(OH)3 lead(iii) hydroxide A

FeOH iron(i) hydroxide N

Fe2O3 iron (iii) oxide S

Pb(OH)3 lead(iii) hydroxide A

FeO iron(ii) oxide R

Pb(OH)2 lead(ii) hydroxide O

Fe2O iron (i) oxide U

FeOH iron (i) hydroxide N

PbO2 lead(iv) oxide D

Explanation:

During hydroboration-oxidation of (Z)-3-methyl-3-hexene, two isomeric products are formed: 3-methyl-2-hexanol and 3-methylhexanal. The structures are shown as follows

3-methyl-2-hexanol:

H H

| |

C C

| |

C C

| |

H H

\ |

C C

| |

C C

| |

H H

| |

C C

| |

H H

| |

C C

| |

H H

| |

C C

| |

H H

3-methylhexanal:

H H

| |

C C

| |

C C

| |

H H

\ |

C C

| |

C C

| |

H H

| |

C C

| |

H H

| |

C C

| |

H H

| |

C C

| |

H H

The chiral carbon atoms in these two compounds are labeled as follows:

3-methyl-2-hexanol:

H H

| |

C C

| |

C C

| |

H H

\ |

C C

| |

C(R) C(S)

| |

H H

| |

C C

| |

H H

| |

C C

| |

H H

3-methylhexanal:

H H

| |

C C

| |

C C

| |

H H

\ |

C C

| |

C(S) C(R)

| |

H H

| |

C C

| |

H H

| |

C C

| |

H H

C C

| |

H H

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Answer:

The combustion of 59.7 grams of methane releases 3320.81 kilojoules of energy

Explanation:

Given;

CH₄ + 2O₂ → CO₂ + 2H₂O, ΔH = -890 kJ/mol

From the combustion reaction above, it can be observed that;

1 mole of methane (CH₄) released 890 kilojoules of energy.

Now, we convert 59.7 grams of methane to moles

CH₄ = 12 + (1x4) = 16 g/mol

59.7 g of CH₄ \(= \frac{59.7}{16} = 3.73125 \ moles\)

1 mole of methane (CH₄) released 890 kilojoules of energy

3.73125 moles of methane (CH₄) will release ?

= 3.73125 moles x  -890 kJ/mol

= -3320.81 kJ

Therefore, the combustion of 59.7 grams of methane releases 3320.81 kilojoules of energy

Answer:

The combustion will release -3,321 KJ/mol of energy

Explanation:

Avogadro's Number:

Avogadro's number, which is equal to 6.02214076 x \(10^{23}\), is the quantity of units in one mole of any material. Hence, 1 mole of HBrO3 will contain

6.02214076 x \(10^{23}\) atoms.

Then, 0.009567 mole of HBrO3 will contain

= 0.009567 moles x 6.02214076 x \(10^{23}\) atoms

=  0.0576138 x    \(10^{23}\)  atoms = 5.761 x \(10^{21}\) atoms.

Hence, 0.009567 mole of HBrO3 will contain 5.761 x \(10^{21}\) atoms.

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To neutralize a given volume of household bleach, you would need a similar volume of a solution containing a reducing agent.

Household bleach is typically a solution of sodium hypochlorite (NaClO), which is an oxidizing agent.

To neutralize its oxidizing properties, a reducing agent is required. A reducing agent is a substance that can donate electrons and counteract the oxidizing effects.

Common examples of reducing agents that can be used to neutralize bleach include sodium bisulfite (NaHSO3), sodium thiosulfate (Na2S2O3), or ascorbic acid (vitamin C).

These reducing agents react with the hypochlorite ions in bleach, converting them into harmless compounds.

When neutralizing bleach, it is important to carefully follow safety guidelines and use appropriate protective measures, as bleach and its reactions can release harmful gases or generate heat.

It is advisable to consult professional advice or refer to specific instructions for the safe neutralization of household bleach.

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To Find :

How many moles are in \(7.12 \times 10^{21}\) atoms of iron.

Given :

We know, 1 mole of any element or compound contains exactly \(N_A\) ( Avogadro's Number ) atoms/compound .

Now, \(N_A = 6.022 \times 10^{23}\)

So, number of moles in given number of atoms are :

\(n = \dfrac{6.022 \times 10^{23}}{7.12 \times 10^{21}}\\\\n = 1.18 \times 10^{-2} \ mol\)

Hence, this is the required solution.

Answer:

A. Food

Explanation:

Water alone does not give energy, Carbon Dioxide cannot be consumed healthily, and photosynthesis is for plants.

Answer:

The answer is...C

Explanation:

10 meters... because you won't just say your answer is ten or neither can just put meter.

The correct way to write this scientific measurements is 10 meters

3 step diagram for the preparation of 0.08330233 M CuCl₂ solution is attached below.

A stock solution can best be described as a concentrated solution of known exact concentration that is diluted for future use in the laboratory. You can choose not to prepare a stock solution, but doing so can streamline your operations while saving significant time and resources in the process.

Now, following are the steps for the preparation of CuCl₂ solution:

1. Weigh out 33.6 g of CuCl₂ precisely.

2. Dissolve the weighed out CuCl₂ in some amount of distilled water and transfer it to a volumetric flask.

3. Calculate the volume of solution and add the required amount of water to make up the volume.

Molarity = moles/volume

0.08330233 = 0.249907/Volume

Volume = 0.249907/0.08330233

Volume = 2.99 L

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Answer:

ligma

Explanation:

Answer:

Oxygen group element, also called chalcogen, any of the six chemical elements making up Group 16 (VIa) of the periodic classification—namely, oxygen (O), sulfur (S), selenium (Se), tellurium (Te), polonium (Po), and livermorium (Lv). ... Modern version of the periodic table of the elements (printable).

The OH- concentration in the aqueous solution is 5.3 x 10^-6 M (option b).

Explanation: In water, the concentration of H3O+ (hydronium ion) and OH- (hydroxide ion) are related by the equation [H3O+][OH-] = Kw, where Kw is the ion product of water and is equal to 1.0 x 10^-14 at 25°C.

Given that [H3O+] = 1.9 x 10^-9 M, we can use the equation above to find the OH- concentration:

[H3O+][OH-] = Kw

(1.9 x 10^-9)(OH-) = 1.0 x 10^-14

OH- = (1.0 x 10^-14) / (1.9 x 10^-9)

OH- ≈ 5.3 x 10^-6 M

Therefore, the OH- concentration in the aqueous solution is approximately 5.3 x 10^-6 M, which corresponds to option b.

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The reaction between AgNO₃ and NaCl forms AgCl and NaNO₃. The balanced chemical equation for the above reaction is given as:

AgNO₃ (aq) + NaCl (aq) → AgCl (s) + NaNO₃ (aq)

The reaction between AgNO₃ and NaCl is both precipitation and double-displacement reaction. The balanced chemical equation is given as:

AgNO₃ (aq) + NaCl (aq) → AgCl (s) + NaNO₃ (aq)

                                          (ppt)

In a double displacement reaction the anions are exchanged and the more reactive element displaces the less reactive element. And in a precipitation reaction, a precipitate is formed in the end of the reaction. In this reaction, AgCl is formed as precipitate.

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Answer:

56 protons and 74 neutrons

Explanation:

There are 56 protons and 74 neutrons in an atom of barium-130.

I am pretty sure it's correct, I checked it over a couple of times. If I'm wrong, feel free to correct me!

Answer:

1.To discover new things.

2.To improve accuracy of existing experiment.

3.To prove or disprove theories.

4.To find anomalies in experiment.

The time it take to dissolve the salt in hot water is faster in warm it is normal but in cold it takes a lot of time or maybe the salt will not get dissolved.

Boiling water (70 degrees) - completely dissolved in 2 minutes.

Water at room temperature (16 degrees) dissolved only 1/4 of the salt in 2 minutes.

Ice cold water (3 degrees) decreased the salt crystals to half their original size but did not dissolve them.

I discovered that cold water does not dissolve crystals; rather, it causes them to change from foggy to clear. I also discovered that when salt is added to boiling water, it causes the water to become foggy for around 5 seconds.

In conclusion, hot water dissolved the salt the fastest, proving my premise right.

Increase the temperature of the water.

Increase the time span

My experiment's goal is to determine how long it takes salt to dissolve in different temperatures of water.

My hypothesis is that the boiling water will totally dissolve in 2 minutes.

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The energy required to ionize a muonic hydrogen atom compare to that required to ionize a regular hydrogen atom:

Muonic hydrogen is an exotic hydrogen atom, where a muon (instead of an electron) orbits proton. Because muon is 200 times heavier than the electron, the muon's orbit is 200 times closer to the proton in muonic hydrogen than that of the electron in regular hydrogen.

The extremely precise extraction of proton radius obtained by Pohl et al. from measured energy difference between the 2P and 2S states of muonic hydrogen disagrees significantly with that extracted from electronic hydrogen or elastic–proton scattering. This discrepancy is proton radius puzzle.

In muonic hydrogen electron is replaced by muon, μ which is 200 times heavier than electron

ΔE= En - Ei

for hydrogen like atom,

ΔE= 13.6(Z square /n square) - (-13.6Z square/1 square)

For, Z=1 and n=x (for ionization)

I.E.=13.6eV for electron

I.E.∝ mass (as binding energy proportional to mass)

I.E.=13.6eV*200

    =2720eV

    =2.720keV

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Answer:

it is becuse the students used wrong apparatus

The biggest error in this investigation is the use of inappropriate types of equipment.

The types of equipment used in the given setup are inappropriate. Suggested improvements in the apparatus to increase the accuracy are given below:

1. The use of a polystyrene cup in the laboratory for any reaction is inappropriate. As a slight increase in temperature causes the decomposition of the chemicals in the cup as well.

2. The use of a thermometer stand is a must. Without using the stand, the tip of the thermometer touches the lid of the container, which causes inaccuracies in the result.

Hence, all the suggestions are listed above.

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