complete and balance the molecular equation for the reaction between aqueous solutions of lithium fluoride and potassium chloride, and use the states of matter to show if a precipitate
2CH3COONH4(aq) +K2S(aq)→ 2CH3COOK (aq) + (NH4)2S(aq)

We can now calculate the energy in Joules contained in a single photon of green signal with a wavelength of 535 nm. E=hv=h⋅cλ.

The wavelength, which will also apply to troughs, is the separation between two wave crests. The frequency is expressed as cycles a second (Hz), which is the quantity of vibrations that cross a specific area inside a second (Hertz).

A waveforms signals that is carried in space via down a wire has a wavelength, which is the separation between two identical places (adjacent crests) inside the consecutive cycles. This length is typically defined in wireless communication systems in metres (m), centimetres (cm), and millimetres (mm) (mm).

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Answer: The temperature would increase assuming it is 30 degree water causing a change in the temperature and assuming it is a seismic groundwater source you are using the earths core to heat the school so it would likely be a stable energy source. There are very few places on the planet where that warm of water is accessible without drilling really deep into the core but if it is there and is a stable fault then the energy would be consistent and stable.

The groundwater system can heat the air in the school by transferring the heat in the ambient atmosphere of school.

Groundwater heating system:

Although the temperature of the ground water is not much but the amount of groundwater is too much.

This large amount water slowly releases heat energy which is transferred in the ambient atmosphere of school.

Therefore, the groundwater system can heat the air in the school by transferring the heat in the ambient atmosphere of school.

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Answer:

c. 2

Explanation:

The alkaline earth family is the second most reactive group, and it's elements can't be found free in nature. They are called "alkaline" earth metals because they form "alkaline" solutions, hydroxides, when they react with water

The specific heat of copper is calculated to be 5.02 J/g oC.

To calculate the specific heat of copper, we can use the following equation:

qwater = (mwater × Cwater × ΔT)

Where:

qwater = amount of heat absorbed by water

mwater = mass of water = 75.0 g

Cwater = specific heat capacity of water = 4.184 J/g oC

ΔT = change in temperature of water = (21.8 - 19.6) = 2.2 oC

Substituting the given values into the equation gives:

qwater = (75.0 g) × (4.184 J/g oC) × (2.2 oC)

= 691.5 J

Next, we can calculate the amount of heat lost by the copper sample using the equation:

qcu = (mcu × Ccu × ΔT)

Where:

qcu = amount of heat lost by copper

mcu = mass of copper sample = 46.2 g

Ccu = specific heat capacity of copper

ΔT = change in temperature of copper = (95.4 - 21.8) = 73.6 oC

Substituting the given values into the equation gives:

qcu = (46.2 g) × (Ccu) × (73.6 oC)

= (3391.92 g oC) × (Ccu)

To find Ccu, we need to divide both sides of the equation above by the product of the mass of the copper sample and the change in temperature of copper:

Ccu = qcu / (mcu × ΔT)

= [(691.5 J) / (46.2 g × 2.2 oC)]

= 5.02 J/g oC

Therefore, the specific heat of copper is calculated to be 5.02 J/g oC.

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Answer:

108 grams

Explanation:

Answer: To determine the correct subscripts in a chemical formula, you have to solve how many atoms you need to balance the charge.

For example if I had the compound Calcium Fluoride I would look at the periodic table and see that Calcium's ionic formula is

C

a

2

+

. How do I know this? Well all elements want to have 8 valance electrons so they can be stable(happy). Seeing that Calcium has 2 valance electrons it is going to give away 2 electrons because that is easier than gaining 6 to be happy. Since Calcium has given away 2 electrons it has two more protons than electrons. We know that Protons have a Positive charge, Electrons have Negative charge, and the number of electrons is equal to the atomic number of an element in its pure non-ionic state. (Meaning it doesn't have a positive or negative charge; it is balanced.)

So if calcium gave away two electrons, it will have two more protons than an electron giving it a (2+) charge. The same process can be applied to Fluoride. Since fluoride is one to the left of the noble gases(group 18 or 8A) on the periodic table we know that it has 7 valance electrons because it is in group 7A or 17.

Knowing that we have 7 electrons the fluoride atom will gain an extra electron. Since the fluoride atom gained an extra electron it will have one more negative charge than a positive making it a

^

(

−

)

ion.

So you know that Calcium has a 2+ charge and that fluoride has a 1- charge, you then need these ions to balance out. So you need two fluorine atoms with a 1- ions to balance out the 2+ ion of calcium. Your final answer would be

C

a

F

2

because you need two fluorine atoms to balance out the 2+ charge of the calcium.

Final Tip: Determine the charges then inverse the charges, remove the positive and negative superscipts, and write the charge numbers as a sub script. Ie. Calcium Fluoride

C

a

2

+

and

F

−

inversing and removing the charge signs would give you

C

a

F

2

Explanation:

Answer:

5 atoms

Explanation:

there is 1 carbon atom and 4 hydrogen atoms

Answer:

lpg and oxygen are two gases which are supplied in compressed form in homes and hospitals

Explanation:

if the observed rotation (α) was –37° for compound b when measured in a 1-dm sample tube containing 0.5 g of b in 2.0 ml of water, the specific rotation ([α]) of compound b is -370,000 g⁻¹ L⁻¹.

To calculate the specific rotation ([α]) of a compound, you need to know the observed rotation (α), the sample length (l), and the sample concentration (c). The formula for specific rotation is:

[α] = α / (l * c)

In this case, you are given the observed rotation (α) as -37°, the sample length (l) as 1 dm (which is equivalent to 10 cm), and the sample concentration (c) as 0.5 g in 2.0 mL.

First, convert the sample length to meters:

l = 10 cm = 0.1 m

Next, convert the sample concentration to g/mL:

c = 0.5 g / 2.0 mL

Now we can calculate the specific rotation ([α]):

[α] = -37° / (0.1 m * c)

Substitute the value of c:

[α] = -37° / (0.1 m * (0.5 g / 2.0 mL))

To simplify the calculation, we can convert mL to liters:

[α] = -37° / (0.1 m * (0.5 g / 0.002 L))

Simplify further:

[α] = -37° / (0.1 m * 0.5 g / 0.002 L)

[α] = -37° / (0.05 g * 0.002 L)

[α] = -37° / 0.0001 g L⁻¹

Perform the division to get the specific rotation:

[α] = -370,000 g⁻¹ L⁻¹

Therefore, the specific rotation ([α]) of compound b is -370,000 g⁻¹ L⁻¹.

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The molar concentration of the weak acid solution is 0.09308 M.

To determine the molar concentration of the weak acid solution, we need to use the balanced chemical equation for the reaction between the weak acid and the strong base NaOH:

HA + NaOH → NaA + H2O

where HA is the weak monoprotic acid and NaA is its corresponding sodium salt.

At the stoichiometric point of the titration, all of the weak acid has reacted with the strong base, and the number of moles of NaOH used is equal to the number of moles of weak acid present in the original solution:

n(HA) = n(NaOH)

We can use the molarity and volume of NaOH used to calculate the number of moles of NaOH used:

n(NaOH) = M(NaOH) × V(NaOH)

= 0.0981 mol/L × 23.74 mL / 1000 mL/L

= 0.002327 moles

Since the molar ratio of HA to NaOH in the balanced equation is 1:1, the number of moles of HA in the original solution is also 0.002327 moles.

To calculate the molar concentration of the weak acid solution, we divide the number of moles of HA by the volume of the original solution used in the titration:

M(HA) = n(HA) / V(HA)

= 0.002327 moles / 25.0 mL / 1000 mL/L

= 0.09308 mol/L

Therefore, the molar concentration of the weak acid solution is 0.09308 M.

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The purpose of this experiment is to observe the effects of chemical bonding on a simulated environment.

Observations from the simulation include the movement of atoms in the simulation indicated an attraction between them, the molecules formed clusters, suggesting an attraction between molecules, and molecules and atoms moved further apart, indicating a repulsive force between them.

A lonic bond is a type of chemical bond that forms when electrons are transferred between two atoms with different electronegativities, creating ions of opposite charges. While a covalent bond is a type of chemical bond that forms when two atoms share a pair of electrons, creating a bond between them.

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Answer:

133.333333333 cm^3

Explanation:

Volume = Mass/Density

The empirical formula : C₁₁O₁₄O₃

The assumption of the compound consists of C, H, and O

mass of C in CO₂ =

\(\tt \dfrac{12}{44}\times 2.492=0.680~g\)

mass of H in H₂O =

\(\tt \dfrac{2.1}{18}\times 0.6495=0.072~g\)

mass of O :

mass sample-(mass C + mass H)

\(\tt 1-(0.68+0.072)=0.248`g\)

mol of  C :

\(\tt \dfrac{0.68}{12}=0.056\)

mol of H :

\(\tt \dfrac{0.072}{1}=0.072\)

mol of O :

\(\tt \dfrac{0.248}{16}=0.0155\)

divide by 0.0155(the lowest ratio)

C : H : O ⇒

\(\tt \dfrac{0.056}{0.0155}\div \dfrac{0.072}{0.0155}\div \dfrac{0.0155}{0.0155}=3.6\div 4.6\div 1\\\\\dfrac{11}{3}\div \dfrac{14}{3}\div \dfrac{3}{3}=11:14:3\)

Answer:

Group 2, Period 6

Barium (Ba)

Explanation:

In a conversation between myself and a friend about a job agency and its reliability, we would discuss the following points:

1. Friend: "Hey, have you heard about the XYZ Job Agency? I'm considering using their services to find a new job."

2. Me: "Yes, I have heard of them. They are known for connecting job seekers with potential employers. They specialize in various industries, which is a plus. However, it's essential to research their success rate and client feedback to determine their reliability."

3. Friend: "That's a good idea. I'll look into their reviews and testimonials to see what others have experienced with their services."

4. Me: "Another important aspect to consider is the type of positions they primarily offer. Are they mainly temporary roles or long-term positions? Depending on your career goals, this information could be crucial in your decision-making process."

5. Friend: "True, I'll make sure to check the job types they provide. I'm looking for something stable and long-term."

6. Me: "Lastly, you might want to inquire about any fees or charges associated with using their services. Some job agencies charge the job seeker, while others receive their payment from the employer. This could impact your overall experience with the agency."

7. Friend: "Thanks for the advice. I'll definitely consider all these factors before deciding whether to use the XYZ Job Agency. I appreciate your input!"

By following this conversation, we covered the key aspects of a job agency's reliability, such as their success rate, client feedback, job types offered, and fees associated.

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Answer:

Wildlife biologists are important to the safety and preservation of animal species, but they also benefit society as a whole. They observe animals in their natural habitats and conduct experimental studies to test for environmental hazards, diseases and unusual movement patterns

Explanation:

Answer:

The required volume of water the student needs is 4.9 litres of water

Explanation:

From the diagram related to the question, we have;

The dimensions of the tank are;

Length of tank = 24.0 cm = 0.24 m

Width of tank = 21.0 cm = 0.21 m

Depth of tank = 13.0 cm. = 0.13 m

Allowance provided between the top of the tank and the top of the water = 2.0 cm

Diameter of the round bottom flask, D = 10.5 cm = 0.105 m

Therefore, the radius of the round bottom flask, r = 0.105/2 = 0.0525 m

Therefore we have;

Depth of water in the tank = Depth of tank - Allowance provided between the top of the tank and the top of the water

∴ Depth of water in the tank = 13.0 - 2.0 = 11.0 cm = 0.11 m

Given that the flask is immersed in the water contained in the tank to raise the tank water level, we have;

Volume of water + Volume of flask in the tank = Length of tank × Width of tank × Depth of water in the tank

Volume of water + Volume of flask in the tank =  0.24 × 0.21 × 0.11 = 0.005544 m³ = 0.005544 m³× 1000 l/m³ = 5.544 l

The volume of the spherical flask = 4/3·π·r³ = 4/3·π·0.0525³ = 6.06×10⁻⁴ m³ = 6.06×10⁻⁴ m³ × 1000 l/m³ = 0.606 l

The required volume of water the student needs , V = Volume of water + Volume of flask in the tank - The volume of the spherical flask = 5.544 l - 0.606 l = 4.9 l.

Explanation:

leading zeros do not count as significant figures, Hence, this number correct to four significant figures should be written as in option E.

Answer:Explanation:

The Roman numeral must have the same value as the charge of the ion. In our example, the transition metal ion Fe2+ would have the name iron(II). Add the name of the anion to the transition metal ion. In our example, FeCl2 would have the name iron(II) chloride since the anion is Cl-, which has the name chloride.

Answer:

Explanation:

My guess is option c

The ratio of the final speed of the electron to the final speed of the hydrogen ion is approximately 0.214.

The ratio of the final speed of the electron to the final speed of the hydrogen ion can be found using the conservation of energy principle.

The potential energy gained by an electron or a hydrogen ion when accelerated through a potential difference V is given by qV, where q is the charge on the particle.

The kinetic energy gained by a particle is given by (1/2)mv\(^2\), where m is the mass of the particle and v is its final velocity.

For an electron, q = -1.6 x 10\(^-19\) C and m = 9.1 x 10\(^-31\) kg.

For a negative hydrogen ion, q = -1.6 x 10\(^-19\) C and m = 3.34 x 10\(^-27\) kg.

The potential energy gained by both the electron and the negative hydrogen ion when accelerated through the same voltage is the same, i.e., qV.

For the electron, the final kinetic energy gained is (1/2)mv\(^2\) = qV.

Solving for v, we get v = sqrt((2qV)/m) = sqrt((2x(-1.6 x 10\(^-19\))*V)/(9.1 x 10\(^-31\))).

For the negative hydrogen ion, the final kinetic energy gained is (1/2)mv\(^2\) = qV.

Solving for v, we get v = sqrt((2qV)/m) = sqrt((2x(-1.6 x 10\(^-19\))*V)/(3.34 x 10\(^-27\))).

Taking the ratio of the final speeds of the electron and the negative hydrogen ion, we get:

v(electron)/v(H-) = sqrt((2x(-1.6 x 10\(^-19\))xV)/(9.1 x 10\(^-31\))) / sqrt((2x(-1.6 x 10\(^-19\))xV)/(3.34 x 10\(^-27\)))

Simplifying this expression, we get:

v(electron)/v(H-) = sqrt((3.34/9.1) x 10\(^-3\)) = 0.214

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Answer:

False

Explanation:

Answer:

element

Explanation:

an element is something made up of only one type of atom

double-replacement reaction has the generic formula AB + CD AD + CB, where A and C are positively charged cations while B and D are negatively charged anions. one of the results of a twofold replacement reaction is a precipitate, a gas, or a molecular molecule.

A double displacement reaction is one in which portion of one reactant is replaced by part of another. The double displacement reaction is written as AB + CD AD + CB. Example: AgNO3+NaClAgNO3+NaClAgNO3+NaNO3.

Double replacement reactions, also known as double displacement, exchange, or metathesis reactions, occur when components of two ionic compounds exchange, resulting in the formation of two new compounds.

When components of two ionic compounds are transferred, two new compounds are formed (also known as double displacement, exchange, or metathesis processes).

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Answer:

141 ml

Explanation:

To determine the concentration of the aqueous solution of iron(II) chloride (FeCl2), we need to calculate the number of moles of FeCl2 and then divide it by the volume of the solution.

First, let's calculate the number of moles of FeCl2:

Given mass of FeCl2 = 200 grams

Molar mass of FeCl2 = atomic mass of Fe + 2 * atomic mass of Cl

= (55.85 g/mol) + 2 * (35.45 g/mol)

= 55.85 g/mol + 70.90 g/mol

= 126.75 g/mol

Number of moles of FeCl2 = Mass / Molar mass

= 200 g / 126.75 g/mol

= 1.578 mol

Next, we can calculate the concentration (molarity) of the solution:

Concentration (molarity) = Number of moles / Volume

= 1.578 mol / 0.5 L

= 3.156 M

Therefore, the concentration of the aqueous solution of FeCl2 is 3.156 M.

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Answer:

If the earth had on Axis, there will be no seasons.

When something about the size of mars clashed with Earth about 4.5 billion years ago, it hit off a piece that became the moon.

I HOPE IT WILL HELP YOU.

Thank you.

^ - ^

A decomposition reaction is a reaction in which the compound is broken up into its constituents.

A decomposition reaction is a reaction in which the compound is broken up into its constituents. When the decomposition is brought about by a catalyst, it is called catalytic decomposition.

Let us look at the catalytic decomposition of the compound potassium trioxochlorate V. in the presence of the catalysts manganese dioxide. The reaction occurs as follows;

2KClO3 -----> 2KCl + 3O2

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0.75 moles of potassium bromide is produced.

What is Moles?

A mole is a unit of measurement used in chemistry to express amounts of a chemical substance. It is defined as the amount of a substance that contains the same number of particles (such as atoms, molecules, or ions) as there are in exactly 12 grams of carbon-12. This number of particles is known as Avogadro's number.

The balanced chemical equation for the reaction between hydrobromic acid (HBr) and potassium hydroxide (KOH) is:

HBr + KOH → KBr + H2O

The coefficients indicate a 1:1 mole ratio between HBr and KBr. Therefore, if 0.75 moles of HBr reacts with 1.2 moles of KOH, then KOH is in excess and will react completely, and the number of moles of KBr produced will be equal to the number of moles of HBr:

0.75 moles HBr → 0.75 moles KBr

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a) The percentage abundance determines the relative atomic mass.

b) The relative atomic mass for the element X is122.5 amu

c) The Rutherford's model explained showed the movement of the electrons.

The isotopes are the kinds of atoms of an element that we can see. We know that all the element that we have in the periodic table are composed of the isotopes and the isotopes of the elements are important in the determination of the relative atomic mass of the element that we may be considering here called X

We can now be able to see from the forgoing that we have here that;

Relative atomic mass = Weighted average of all the isotopes

As such we have;

(121 * 0.432) + (123 * 0.531) + (129 * 0.0370)

52.27 + 65.31 + 4.773

=122.35 amu

The Rutherford model of the atom can also be called the planetary model of the atom and this is the model that can be able to explain to us the way that the electrons move round the nucleus.

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