3.
Balance the following reactions.
i)
Mg +
HCI →
MgCl2 +
H2
ii)
Mg(OH)2 +_
HCI →
MgCl2 +
H20
AgNO3 +
K3PO4 →
Ag3PO4 +
KNO3
iv)
H2SO4 +
Pb(OH)4 →
Pb(SO4)2 +
H2O
v)
Ca (OH)2 +
H3PO4 →
Ca3(PO4)2 +
H20​

Answer:

pH = 3.12

Explanation:

C7H7NH2   + HCl ---> C7H7NH3+Cl-

moles of C7H7NH2 = 0.027 x 0.063 = 1.7 x 10^-3  mol

moles of C7H7NH2 = moles of HCl at equivalence point

1.7 x 10^-3  = 0.048 x V

V = 0.035 L

volume of HCl = 0.035 L

so C7H7NH3+Cl- salt formed = 1.7 x 10^-3 moles

salt concentration = moles / total volume

= 1.7 x 10^-3 / (0.027 + 0.035)  = 0.027M

this salt formed from weak base strong acid . so pH <7

pH = 7 - 1/2 [pKb + logC]

pH = 7 -1/2 [9.33 + logC]

pH = 3.12

The statement that best represents the velocity is the speed of an object in a specific direction.

Kinematics is the branch of mechanics concerned with the motion of objects without reference to the forces which cause the motion.

Given is a term used widely in kinematics. The term is velocity.

Assume that the motion is one - dimensional. Velocity is a vector quantity. This means, it has both magnitude and direction. Velocity is defined as the rate of change of displacement with respect to time. Mathematically -

v = Δx/Δt

Now, option [a] and [b] cannot be correct as they involve the measurement of speed. Option [d] gives the measurement of distance travelled. Displacement and distance for a one dimensional motion (either in forward or backward and not involving both) are same in magnitude. In this case, you can say that the speed of an object in specific direction is velocity.

Therefore, the statement that best represents the velocity is the speed of an object in a specific direction.

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441 g CaCO₃ would have to be decomposed to produce 247 g of CaO

Reaction

Decomposition of CaCO₃

CaCO₃ ⇒ CaO + CO₂

mass CaO = 247 g

mol of CaO(MW=56 g/mol) :

\(\tt mol=\dfrac{mass}{MW}\\\\mol=\dfrac{247}{56}\\\\mol=4.41\)

From equation, mol ratio CaCO₃ : CaO = 1 : 1, so mol CaO :

\(\tt \dfrac{1}{1}\times 4.41=4.41\)

mass CaCO₃(MW=100 g/mol) :

\(\tt mass=mol\times MW\\\\mass=4.41\times 100\\\\mass=441~g\)

Answer:

the answer is D  

:)

:D

Explanation:

Answer:

1080 meters.

Explanation:

The aquarium has 0.35 g of dissolved oxygen in it.

The quantity of matter in an object is expressed in terms of mass. It is a scalar number, and units like grams, kilograms, and pounds are used to measure it. Weight, the force of gravity acting on an object, is not the same as mass. An object's mass is a fundamental characteristic that exists regardless of where it is or the gravitational environment it is in.

Henry's law, which connects the concentration of a gas in a solution to its partial pressure, can be used to determine the mass of oxygen (O2) that would be dissolved in a 40 L aquarium:

C = kH x P

where P is the partial pressure of the gas, kH is the Henry's law constant, and C is the concentration of the gas in the solution.

To solve the concentration by rearranging the equation, we obtain:

C = (kH x P) 

Using the above values for kH and P, we obtain:

C = (1.3 10^-3 M/atm) x (0.21 atm) = 2.73 10^-4 M.

This indicates that the aquarium's dissolved oxygen concentration is 2.73 x 10^-4 M.

We can use the following equation to determine the mass of O2 dissolved in the aquarium:

Mass = concentration x volume x molar mass.

where O2 has a molar mass of 32 g/mol.

Inputting the values provided yields:

mass = (2.73 x 10^-4 M) x 40 L x 32 g/mol = 0.35 g

As a result, the aquarium has 0.35 g of dissolved oxygen in it.

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The amount of Amoxicillin dose given to the 85.4 lb child daily is determined as 1,743.3 mg.

The amount of  Amoxicillin  dose given to the child is calculated as follows;

amount of Amoxicillin dose = weight of the child x dosage prescribed

The weight of the child in pounds (lb) is calculated as follows;

1 lb = 0.453592 kg

85.4 lb = ?

= 85.4 x 0.453592 kg

= 38.74 kg

amount of Amoxicillin dose = 38.74 kg x 45 mg/kg

amount of Amoxicillin dose = 1,743.3 mg

Thus, the amount of Amoxicillin dose given to the 85.4 lb child daily is determined as 1,743.3 mg.

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The complete question is below:

A 85.4 lb child has a Streptococcus infection. Amoxicillin is prescribed at a dosage of 45 mg per kg of body weight per day given b.i.d. Calculate the daily dose of the child.

Answer:

Why does a beaker disappear in oil?

If you submerge regular glass in vegetable oil, the light is refracted between the oil and the glass surface, allowing you to see the glass through the oil. ... The Pyrex® glass has the same angle of refraction as the vegetable oil, so the light bends at the same angle. As a result, the Pyrex® glass seems invisible.

Explanation:

Answer: Topical Anesthesia.

Explanation:

Topical anesthetics are used to treat ailments including small burns, insect bites, poison ivy, poison oak, poison sumac, and minor cuts and scratches that cause discomfort and irritation.

The nerve terminals in the skin are numbed by topical anesthesia. They don't render patients unconscious like general anesthetics used during surgery do. The majority of topical anesthetics are accessible over-the-counter, but your doctor may have specific recommendations for their usage and dosage given your particular medical condition.

Answer:

Prueba con tus argumentos quienes sufren mas con la violencia?

Answer:

Sure! The complete balanced chemical equation for the reaction you provided is: `2A + BC3 -> AC2 + 3B`.

There are 3.44 x 10^{22} particles in 0.057 moles of lithium bromide.

The lithium bromide formula also known as the lithium monobromide formula or Bromo lithium formula is explored. It is a counterion bromide-based salt of lithium.

we have to use Avogadro's constant,

Avogadro's constant, is approximately equal to 6.022 x 10^{22} particles per mole.

we can use the following formula:

number of particles = moles x Avogadro's constant

Substitute the values,

number of particles = 0.057 moles x 6.022 x 10^{23} particles/mol

Simplifying the equation

number of particles = 3.44 x 10^{22} particles

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Answer:

B. They are clones of the parent plant

Explanation:

Hard water contains higher levels of minerals such as calcium and magnesium, while soft water has low levels of these minerals. While both hard and soft water can be safe for drinking, hard water is generally considered safer due to the minerals it contains.

The minerals in hard water can actually be beneficial to human health, as they are important for strong bones and teeth. In addition, the minerals in hard water can help to balance the body's electrolytes and may have other health benefits.

Soft water, on the other hand, may contain higher levels of sodium or other chemicals used in the softening process. While these levels are generally considered safe, some people with certain health conditions may need to avoid drinking water with higher sodium levels.

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With the compounds sample mass at  150g, and we are left to decipher the proportion of Carbon, Hydrogen, and Oxygen amount, The compound's empirical formula is mathematically given as

Ep=C5H12O4

Question Parameters:

A 150 g sample of a compound is comprised of 44.07% C, 8.98% H and the remainder is O by mass

Generally, the equation for the compound  is mathematically given as

CxHyOz

Where

Therefore

O percentage is

Po100-(44.07+8.98)

Po=46.95

For Cx we determine the minimum value

hence

x=1.25*4

x=5

For Hy

y=3.0*4

For  Oz

y= 1*4

y=4

In conclusion, the empirical formula is

C5H12O4

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Answer:

i dont care to you

Explanation:

cause you are tuyo

solution is 9°5

Stars form in large, dense regions of gas and dust known as molecular clouds. These clouds are located primarily in the spiral arms of galaxies, where they are exposed to intense radiation from nearby stars. As the gas and dust in these clouds are subjected to this radiation, they begin to collapse under their own gravity. As the collapse continues, the cloud becomes denser and denser, and eventually a protostar forms at its center. Over time, this protostar continues to contract and heat up, eventually reaching the point where nuclear fusion can begin in its core. At this point, the protostar becomes a fully-fledged star, and the process of star formation is complete.

TL;DR: Within the clouds of dust and scattered throughout most galaxies.

The molar concentration of alkane C₂₀H₂₄ is 3.6731 x 10 ⁻⁵ M

A chemical species' concentration in a solution, specifically the amount of a solute per unit volume of solution, is measured by its molar concentration. The most used molarity unit in chemistry is the number of moles per liter, denoted by the unit symbol mol/L or mol/dm3 in SI units.

The Concentration of alkane C₂₀H₂₄ = 0.13 ppb

since 1 ppb =10⁻³ mg/L concentration of C₂₀H₂₄ is 1.3 x10⁻⁴ mg/L

Density of water = 1.00 g/mL

Molar concentration = mass / (molar mass x Volume)

Formula weight of C₂₀H₂₄= 282.55

Mass C₂₀H₂₄ = 1.3 x10⁻⁴ mg/L =1.3 x10⁻⁷g/L

Molar concentration = mass / (molar mass x Volume)

Molar concentration  C₂₀H₂₄ = 1.3 x10⁻⁷g/L / 282.55 g / moles

Molar concentration  C₂₀H₂₄ = 3.6731 x 10 ⁻⁵ M

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If all the pumped water had remained in the cave system, approximately 71.43% of the cave would have been filled with water.

To calculate the percentage of the Thanksgiving Luang cave system that would have been filled with water if all the pumped water had remained, we need to find the ratio of the volume of water to the total volume of the cave system.Given that the cave system is estimated to be 35 million cubic meters large and 250 million liters of water were pumped out, we need to convert liters to cubic meters. Since 1 liter is equal to 0.001 cubic meters, the pumped water volume in cubic meters is 250 million multiplied by 0.001, which is 250,000 cubic meters.To find the percentage, we divide the volume of water (250,000 cubic meters) by the total volume of the cave system (35 million cubic meters) and multiply by 100.

Percentage = (Volume of water / Total volume of cave system) x 100

          = (250,000 / 35,000,000) x 100

          ≈ 0.7143 x 100

          ≈ 71.43%

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in solid matter, atoms or molecules pack close to each other in fixed locations; in gases, atoms or molecules pack about as closely as they do in solid matter, but they are free to move;

Liquid butane C4H10 is likely to be miscible with D.) pentane.

Liquid butane, C4H10 is a nonpolar molecule, and it is likely to be miscible with other nonpolar substances. Among the given options, substance that is nonpolar and has similar polarity to butane is (d) CH3CH2CH2CH2CH3, which is pentane. Therefore, liquid butane is likely to be miscible with pentane.

On the other hand, options (a) CH3NH2 and (b) H2O are polar substances and are unlikely to be miscible with butane. Option (c) CH3OH is polar, but it has a lower molecular weight than that of butane and has some polar character, so it is also unlikely to be miscible with butane.

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Answer:

3.5hrs

Explanation:

Using the formula Speed = Distance/Time

Given

Speed = 8mi/hr

Distance = 28miles

Get the time

Time = Distance/Speed

Time = 28/8

Tme = 3.5hrs

Hence it will take 3.5hrs to travel

Answer:

Both protons and neutrons have the same mass, 1.67*10^-24 grams. This is one Dalton.

Explanation:

An atom is composed of protons, electrons and neutrons. The nucleus contains protons and neutrons and they are collectively called nucleons. The mass of one proton is 1.67 × 10⁻²⁷ kg.

The particles which are smaller in size than the size of an atom are called the subatomic particles. An atom contains three sub - atomic particles. They are protons, neutrons and electrons. The positively charged sub atomic particles are called the protons.

In an atom the number of protons and electrons are equal. So the atom is electrically neutral in nature. The mass of one proton is 1.67 × 10⁻²⁷ kg.

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Answer:

lungs

Explanation:

Hello. You forgot to say that this question is about the possibility of using some type of product that prevents cut apples from becoming darker.

Answer and Explanation:

1. The problem with this activity is "What can you put on an apple slice to keep it from turning brown?" The problem in a scientific experiment is the element that provides a question about what is being observed.

2. Hypotheses are assumptions made about what was observed, in addition, hypotheses can answer the question shown in the problem. In the case of apples, the hypotheses can be: "Lemon juice is the most efficient product in delaying the blackening of cut apples." "Water is inefficient in preventing blackened cut apples." "Milk accelerates the blackness of cut apples."

3. The dependent viable is one that needs to be influenced by another element to bring about a result. In the case of the experiment with apples, the dependent variable is the blackening rate of the apple slices.

4. The independent variable, on the other hand, refers to the element that does not need any influence to cause a result, on the contrary, this variable acts on the dependent variable, influencing it. In the case of this experiment, the independent variable is the types of liquid tested to delay the blackening of cut apples.

5. Lemon was the most efficient liquid. Probably this efficiency is related to the lemon's ability to decrease the strength of antioxidants, due to its very low pH.

Answer:

Cardiac muscle cells are located in the walls of the heart, appear striated, and are under involuntary control. Smooth muscle fibers are located in walls of hollow visceral organs, except the heart, appear spindle-shaped, and are also under involuntary control.

Explanation:

6 moles of water will be produced. after analyzing the stoichiometry of the equation, where the number of water molecules is divided by the molecular mass of water which is 18 grams.

What are Moles?

Standard scientific unit for calculating the number of atoms, molecules, or other specific particles in vast amounts. The mole designates 6.02214076 × \(10^{23}\) units, which is a very large number.

What is Stoichiometry?

To calculate the appropriate quantitative data, a chemistry concept known as stoichiometry uses relationships between the reactants and/or products of a chemical reaction. Understanding the relationships that exist between products and reactants and why they exist, which necessitates understanding how to balance reactions, is crucial before using stoichiometry to perform calculations regarding chemical reactions.

6 moles of water will be produced.

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Answer:

P6S9

Explanation:

Firstly, let's write the numbers in Latin

1 = mono

2 = di

3 = tri

4 = tetra

5 = penta

6 = hexa

7 = hepta

8 = octa

9 = nona

Secondly, write the symboles of the given elements:

Phosphorus is P

Sulfide is S

Finally, connect the numbers and symbols.

Rule of pronunciation: Number of first element + symbol of first element + number of second element + symbol of second element

P6S9

Please upvote.

The electronegativity increases across the period and decreases down the group. Thus, option B is correct.

Electronegativity can be defined as the tendency of an atom to gain or attract an electron. The electronegativity has been dependent on the size of the atom, as well as the atomic number and valence electrons.

The atom with the requirement of a less number of atoms to complete its octet can easily gain the electron and thereby have high electronegativity. The atomic size also plays a role in the electronegativity of the atom.

The atom with a bigger size has the lesser force of attraction from the nucleus and thus has difficulty attracting the electron, however, the smaller size atom can easily attract the electron with the attraction force from the nucleus.

Thus, the elements with smaller sizes and a high number of valence electrons are more electronegative. In the periodic table, on moving from left to right the valence electrons increase, thus the electronegativity increases.

On moving down the group, the element size increase, thus the electronegativity decreases down the group.

The electronegativity increases across the period and decreases down the group. Thus, option B is correct.

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The best way to measure the pH of a natural solution while out in a forest is to use a portable pH meter or pH test strips specifically designed for field use. These instruments provide accurate and reliable pH measurements and are convenient for outdoor applications.

1. Prepare the necessary equipment: Before heading out to the forest, gather the required tools. You will need a portable pH meter or pH test strips, as well as the necessary reagents or calibration solutions if using a pH meter.

2. Collect the sample: Locate the natural solution you want to measure the pH of, such as a stream, pond, or soil. Use a clean container to collect a representative sample of the solution.

3. Calibrate the pH meter (if applicable): If you are using a portable pH meter, it is essential to calibrate it before taking measurements. Follow the manufacturer's instructions to calibrate the meter using the provided calibration solutions.

4. Conduct the measurement: For pH meters, immerse the electrode into the collected sample. Allow some time for the reading to stabilize, and then record the pH value indicated on the meter's display.

5. Using pH test strips: If you are using pH test strips, dip the strip into the collected sample for the recommended amount of time. Remove the strip and compare the color change with the provided color chart. Determine the corresponding pH value from the chart.

6. Repeat for accuracy: To ensure reliability, repeat the measurement process at least once and compare the results. This step helps confirm the accuracy of your measurements.

7. Record and analyze the data: Note down the pH values obtained and any relevant observations. Analyze the data as needed for your research or monitoring purposes.

By following these steps and using the appropriate equipment, you can effectively measure the pH of a natural solution while in a forest setting.

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