When ammonium chloride is dissolved in water, the beaker gets cold. Which type of reaction does this describe
O exothermic
O endothermic
O both exothermic and endothermic
O neither exothermic nor endothermic

Answer: a)Complete ionic equation:

2NH₄⁺ + S²⁻ + Fe²⁺ + SO₄²⁻ → 2NH₄⁺ + SO₄²⁻ + FeS

Net ionic equation:

Fe²⁺ + S²⁻ → FeS

b) Complete ionic equation:

2Na⁺ + SO₃²⁻ + Ca²⁺ + 2Cl⁻ → 2Na⁺ + 2Cl⁻ + CaSO₃

Net ionic equation:

SO₃²⁻ + Ca²⁺ → CaSO₃

c) Complete ionic equation:

Cu²⁺ + SO₄²⁻ + Ba²⁺ + 2Cl⁻ → Cu²⁺ + 2Cl⁻ + BaSO₄

Net ionic equation:

Ba²⁺ + SO₄²⁻ → BaSO₄

Explanation:

(a) Balanced formula equation:

(NH₄)₂S + FeSO₄ → (NH₄)₂SO₄ + FeS

Complete ionic equation:

2NH₄⁺ + S²⁻ + Fe²⁺ + SO₄²⁻ → 2NH₄⁺ + SO₄²⁻ + FeS

Net ionic equation:

Fe²⁺ + S²⁻ → FeS

(b) Balanced formula equation:

Na₂SO₃ + CaCl₂ → NaCl + CaSO₃

Complete ionic equation:

2Na⁺ + SO₃²⁻ + Ca²⁺ + 2Cl⁻ → 2Na⁺ + 2Cl⁻ + CaSO₃

Net ionic equation:

SO₃²⁻ + Ca²⁺ → CaSO₃

(c) Balanced formula equation:

CuSO₄ + BaCl₂ → CuCl₂ + BaSO₄

Complete ionic equation:

Cu²⁺ + SO₄²⁻ + Ba²⁺ + 2Cl⁻ → Cu²⁺ + 2Cl⁻ + BaSO₄

Net ionic equation:

Ba²⁺ + SO₄²⁻ → BaSO₄

Therefore, the volume of the irregularly-shaped piece of aluminum is 32.7 cm³

To find the volume of the irregularly-shaped piece of aluminum, we can use the formula:

Density = Mass / Volume
Rearranging the formula to solve for volume, we get:

Volume = Mass / Density

Plugging in the given values:

Volume = 88.3 g / 2.70 g/cm³

Simplifying the equation:

Volume = 32.7 cm³

Therefore, the volume of the irregularly-shaped piece of aluminum is 32.7 cm³.

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Answer:

D. Evaporation of sea water

Explanation:

Explanation:

this answer is a substance has large MS and small volume that are recover Council cute about his sister and brother it has a low distinguish inside incensed a substance is thick and warm

To calculate the heat transferred, we can use the formula:

Q = m * c * ΔT

Where:

Q is the heat transferred

m is the mass of the water

c is the  specific heat capacity of water

ΔT is the change in temperature

Given:

Mass of water (m) = 160 grams

Specific heat capacity of water (c) = 4.18 J/g°C

Change in temperature (ΔT) = 27°C - 18°C = 9°C

Substituting the values into the formula:

Q = 160 g * 4.18 J/g°C * 9°C

Calculating the expression:

Q = 6028.8 J

Therefore, the heat transferred is 6028.8 Joules.

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When H2CO3 dissociates into H and HCO3- the pH of water increases to an extent but not much.

       H2CO3-->H+ + HCO3-

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The two chlorine atoms have a total charge of -2 hence the total charge in the compound is zero. Three oxygen atoms each having a charge of -2 making a total charge of -6 hence the total charge in the compound is zero.

In magnesium chloride, magnesium has a charge of +2. Chlorine has a charge of +1. However, in the compound, there are two chlorine atoms and one magnesium atom. As such, the two chlorine atoms have a total charge of -2 hence the total charge in the compound is zero.

In Aluminium oxide (Al2O3), there are two aluminium atoms having a total charge of +6. There are three oxygen atoms each having a charge of -2 making a total charge of -6 hence the total charge in the compound is zero.

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Answer:

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we use a separating funnel to separate oil from water , we are using funnel because both water and oil both are immiscible liquids.

the process of separation of oil from water is called filtration ✔️

no copied answer :)

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Answer:

When students like the class they are more likely to achieve good grades?

They found that on average, children who enjoyed school at 6 years old were 64% more likely to get 5 or more A*-C grades (equivalent to 9-4 in the new grading system). One reason for this could be that when students enjoy school more, they are more likely to work harder and engage more with their learning.

Explanation:

Answer:

b and In a primitive unit cell, particles or points are present only at the corners while in a centred unit cell, the particles or points are also present at other positions in addition to the corner

Explanation:

The missing question is:

What is the percent efficiency of the laser in converting electrical power to light?

The percent efficiency of the laser that consumes 130.0 Watt of electrical power and produces a stream of 2.67 × 10¹⁹ 1017 nm photons per second, is 1.34%.

A particular laser consumes 130.0 Watt (P) of electrical power. The energy input (Ei) in 1 second (t) is:

\(Ei = P \times t = 130.0 J/s \times 1 s = 130.0 J\)

The laser produced photons with a wavelength (λ) of 1017 nm. We can calculate the energy (E) of each photon using the Planck-Einstein's relation.

\(E = \frac{h \times c }{\lambda }\)

where,

\(E = \frac{h \times c }{\lambda } = \frac{6.63 \times 10^{-34}J.s \times 3.00 \times 10^{8} m/s }{1017 \times 10^{-9} m }= 6.52 \times 10^{-20} J\)

The energy of 1 photon is 6.52 × 10⁻²⁰ J. The energy of 2.67 × 10¹⁹ photons (Energy output = Eo) is:

\(\frac{6.52 \times 10^{-20} J}{photon} \times 2.67 \times 10^{19} photon = 1.74 J\)

The percent efficiency of the laser is the ratio of the energy output to the energy input, times 100.

\(Ef = \frac{Eo}{Ei} \times 100\% = \frac{1.74J}{130.0J} \times 100\% = 1.34\%\)

The percent efficiency of the laser that consumes 130.0 Watt of electrical power and produces a stream of 2.67 × 10¹⁹ 1017 nm photons per second, is 1.34%.

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Answer:

When an atom gains/loses an electron, the atom becomes charged, and is called an ion. Gaining an electron results in a negative charge, so the atom is an anion. Losing an electron results in a positive charge, so atom ion is a cation

Explanation:

Answerd the question : ion

Answer:

nonmetel

Explanation:

Answer:

Its a non-metal

Explanation:

Elements that tend to gain electrons to form anions during chemical reactions are called non-metals. These are electronegative elements. They are non-lustrous, brittle and poor conductors of heat and electricity (except graphite). Non-metals can be gaseous, liquids or solids.

Answer:

b

Explanation:

Ar's particle volume is larger than Ne's, Ar(g) deviates from ideal behavior at extremely high pressures more than Ne(g).

The volume of the gas is insignificant compared to the container when thinking about a gas ideal behavior. The forces of attraction between the particles are insignificant. At very high pressures, Ar(g) deviates from ideal behavior more than Ne(g).

Because Ar has a larger particle volume than Ne, Ar(g) deviates from ideal behavior at extremely high pressures more than Ne(g).

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The quantity of deer is a dependent variable, whereas time is an independent variable.

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Halogenated hydrocarbons are compounds containing one or more halogen atoms, such as:

That have replaced a hydrogen atom in a hydrocarbon.

Substituting a hydrogen atom with a halogen in a hydrocarbon will result in the formation of a halogenated hydrocarbon. Depending on the type of halogen used, the properties of the hydrocarbon can be drastically altered.

For example, replacing a hydrogen atom with a chlorine atom will increase the compound’s reactivity, while replacing it with a bromine atom will make the compound more stable and insoluble in water.

In addition, it can also affect the physical properties of the compound, such as boiling and melting points.

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Answer:

69g

Explanation:

Given reaction expression:

             2NO  +  O₂ →2 NO₂

Unknown:

Mass of NO₂ produced  = ?

Solution:

To solve this problem, let us use the mole concept. We solve from the known to the unknown

In this regard, find the number of moles of O₂ given;

  Number of moles  = \(\frac{mass}{molar mass}\)  

Molar mass of O₂  = 2(16g/mol)  = 32g/mol

  Number of moles  = \(\frac{12}{16}\)   = 0.75mole

From the balanced reaction equation;

    1 mole of O₂ will produce 2mole of NO₂;

   0.75 mole of O₂ will produce 1.5mole of NO₂

Therefore, mass of NO₂;

  Mass of NO₂ = number of moles x molar mass

  Molar mass of NO₂ = 14 + 2(16) = 46g/mol

  Molar mass of NO₂ = 1.5 x 46  = 69g

Answer:

applied force .....I'm pretty sure

Answer:

A. Applied forces aka Contact forces

Explanation:

Thos force is created when you apply forces to an object as in a push/pull or other physical ways.

I hope it helps! Have a great day!

Anygays-

Answer: 5 atm

Explanation: The total pressure of a mixture of gases is given by the Ideal Gas Law: PV = nRT, where P is the total pressure, V is the volume, n is the number of moles of gas, R is the ideal gas constant, and T is the temperature in kelvins.

In a constant temperature scenario, where the volume and the number of moles of the gases are kept constant, the total pressure of the mixture is simply the sum of the individual pressures of the gases. So in this case, the total pressure will be 2 atm + 3 atm = 5 atm.

To prepare 400 ml of a 3 mmol solution of EDTA, you will need approximately 0.447 grams of EDTA.

To prepare a 400 ml solution of EDTA with a concentration of 3 mmol/L, we need to calculate the amount of EDTA required in grams.

First, we need to convert the concentration from mmol/L to mol/L. Since 1 mmol is equal to 0.001 mol, the concentration becomes 0.003 mol/L.

Next, we multiply the concentration by the volume of the solution in liters to find the number of moles required. The volume is given as 400 ml, which is equivalent to 0.4 L.

Thus, the number of moles needed can be calculated as follows: 0.003 mol/L * 0.4 L = 0.0012 mol.

To convert moles to grams, we use the molecular weight of EDTA, which is given as 372.24 g/mol. Multiplying the number of moles by the molecular weight gives us the mass of EDTA required:

0.0012 mol * 372.24 g/mol = 0.446688 g.

Therefore, to prepare 400 ml of a 3 mmol solution of EDTA, you will need approximately 0.447 grams of EDTA.

In conclusion, you need approximately 0.447 grams of EDTA to prepare a 400 ml solution with a concentration of 3 mmol/L.

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The percent yield of this reaction is 53.05 %.

From the question, we have

Moles of carbon = 5.25/12.011 = 0.437

Mass of carbon dioxide formed = mole*molar mass

= 0.437 mol*44g/mol = 19.228 g.

Percent yield = 10.2/19.228*100%

=53.05%

The percent yield of this reaction is 53.05 %.

mass in physics, quantitative measure of inertia, a fundamental property of all matter. It is, in effect, the resistance that a body of matter offers to a change in its speed or position upon the application of a force.

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Answer:

37

Explanation:

( 98.6 - 32 ) × 5(100c) ÷ 9(180f) = 37

Answer:

134.397 Joules

Explanation:

Using the formula:

E = C × m × Δθ (where E is Energy, C is specific heat capacity and Δθ is change in temperature)

So E = 0.45×5.45×(79.8-25)

So E = 134.397 Joules

The heat required to raise the temperature of 5.45g of iron is equal to 134.4 J.

The specific heat capacity is described as the quantity of heat required to raise the temperature of one unit of substance by one-degree Celsius. The specific heat capacity of the substance depends upon the nature of the substance, not its quantity.

The mathematical formula can be used to determine the specific heat is equal to:

Q = m×C×ΔT

Given, the mass of the sample of iron, m = 5.45 g

The initial temperature of the sample, T₁ = 25°C

The final temperature of the sample, T₂ = 79.8°C

The specific heat capacity of iron, C =  0.450 J/g.°C

The heat required for the sample of iron will be:

Q = 5.45 × (0.450) × (79.8 -25)

Q = 134.4 J

Therefore, the heat required to raise the temperature of a 5.45g sample of iron is 134.4 J.

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To calculate the concentration of the iron sample by using a spectrophotometric method, it is necessary to dilute the sample. The volume to which the sample should be diluted is a crucial question in achieving the most accurate result.

The process involves diluting the sample, and the concentration must be calculated to determine the precise result of the dilution. This question can be answered by calculating the uncertainty and identifying the value of the uncertainty. The value with the lowest uncertainty will be the best value to choose. The volume with the lowest uncertainty will be the ideal volume to dilute the 5 ml aliquot of the iron sample to achieve a result with the minimum level of uncertainty.
To determine the optimal volume for dilution, the uncertainty should be calculated.
This can be done by using the equation for propagation of uncertainty, which states that the uncertainty of the result is equal to the square root of the sum of the squares of the uncertainties of the individual components. When calculating the uncertainty of the diluted sample, the uncertainty of the initial sample and the uncertainty of the diluent must be considered. The uncertainty of the initial sample can be calculated using the calibration curve. As the expected iron content is 40-60%, the concentration of the sample is expected to be 8-12 ppm. The uncertainty of the calibration curve is given by the standard deviation of the calibration standards.
The diluent has a negligible uncertainty. The uncertainty of the diluted sample will be lower if a larger volume is used for dilution because the relative contribution of the uncertainty of the initial sample will decrease. However, the uncertainty of the measurement will increase if the sample is diluted too much because the concentration of the analyte will be too low to be detected accurately. A 100 mL volume is a good choice because it balances the need for sufficient dilution to reduce the uncertainty of the initial sample with the need for sufficient concentration to allow for accurate detection of the analyte.

The volume of the sample that should be diluted is 5 ml. The minimum level of uncertainty is obtained at a dilution of 100 ml. When the volume of the diluent is greater than 100 ml, the uncertainty of the measurement increases, and when the volume of the diluent is less than 100 ml, the uncertainty of the measurement also increases. Thus, a 100 ml volume of diluent is the ideal volume to minimize the uncertainty in the analysis of iron.

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hope this is correct

Answer:

D

Explanation:

Iron is the fourth most abundant element, by mass, in the Earth's crust. The core of the Earth is thought to be largely composed of iron with nickel and sulfur. The most common iron-containing ore is haematite, but iron is found widely distributed in other minerals such as magnetite and taconite.

Constipation is commonly treated with fiber supplements. Wheat bran, for example, is an insoluble fiber supplement that helps stimulate the mucosal membrane of your colon. They soften your stool and reduce the time it takes for feces to pass through your colon by doing so.

Incontinence or diarrhea advice:

Foods that irritate the stomach and induce loose stools should be avoided (especially caffeine, dairy, and alcohol).

Stay hydrated by drinking plenty of water or electrolyte-containing drinks.

To bulk up your stool, increase your fiber intake.

Constipation remedies

At least 25 to 31 grams of fiber Trusted Source should be consumed each day.

Increase your degree of physical exercise.

When you have the desire to go, go to the restroom instead of trying to hold it in.

Answer:

122 gm

Explanation:

54 days is 2 half lives :    ( 27 * 2 = 54)

  1/2   * 1/2 = 1/4 will be left

      1/4 * 488 = 122 gm