? + HCl -> FeCl2 + ?
CaO + ? -> Ca(NO3)2 + ?
? + Cu(OH)2 -> CuCl2 + ?

Measles is a communicable disease that requires immunization to prevent illness when exposed to it.

Measles is a communicable disease and highly contagious. It  is usually very serious in children. The disease can be contacted through droplets in the air, physical contact and through mother-to-child transmission.

It is a very serious disease as it is caused by a virus which replicates very fast in the throat and nose thereby creating symptoms such as runny nose, coughing, sneezing and is usually accompanied with a rash.

The severity and death rates is what gave rise to the creating of a measles vaccine which is usually given to babies after birth to make them immune to the potential exposure to the virus.

Diabetes, bronchitis and strep throat have no vaccine as they can always be treated or managed with over-the-counter drugs.

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Answer:

That means that mixture is HeteroGeneous.

Explanation:

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Two preparations of radioactively labeled phage were necessary to distinguish between the transmission of DNA and protein, allowing for a conclusive determination of DNA as the genetic material.

The Hershey and Chase experiments were pivotal in confirming that DNA, not protein, is the genetic material responsible for transmitting hereditary information in bacteriophages. These experiments involved the preparation of two different types of radioactively labeled phage, one with radioactive sulfur (S-35) and the other with radioactive phosphorus (P-32).

The reason two preparations were required is because sulfur is predominantly found in proteins, while phosphorus is predominantly found in DNA. By using radioactive sulfur to label the proteins and radioactive phosphorus to label the DNA, the researchers aimed to track the transmission of genetic material from the phage to the host bacterium.

By comparing the amount of radioactivity in the bacterium after infection with the labeled phages, the researchers could determine whether DNA or protein was the material being transferred. If the labeled DNA was found in the bacterium, it would support the conclusion that DNA is the genetic material.

Therefore, two preparations of radioactively labeled phage were necessary to distinguish between the transmission of DNA and protein, allowing for a conclusive determination of DNA as the genetic material.

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"To insure proper operation of an oxygen cylinder regulator, make sure no oil residue is present" is true because oil residue can compromise the functioning of an oxygen cylinder regulator.

Explanation: It is true that to ensure proper operation of an oxygen cylinder regulator, it is important to make sure that no oil residue is present. Oxygen cylinders contain highly concentrated oxygen that can react violently with oil or grease, leading to combustion or explosions. Oil residue can contaminate the regulator and pose a significant safety risk.

Therefore, it is crucial to keep oxygen cylinders and their regulators free from any oil or grease to maintain safe and proper functioning.

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Answer:

0.74 atm.

Explanation:

From the question given above, the following data were obtained:

Pressure of Ne (Pₙₑ) = 1.52 atm

Pressure of He (Pₕₑ) = 766 mmHg

Total pressure (Pₜ) = 3.27 atm

Pressure of Ar (Pₐᵣ) =?

Next, we shall convert the pressure of He from mmHg to atm. This can be obtained as follow:

760 mmHg = 1 atm

Therefore,

766 mmHg = 766 mmHg × 1 atm / 760 mmHg

766 mmHg = 1.01 atm

Finally, we shall determine the partial pressure of Ar. This can be obtained as follow:

Pressure of Ne (Pₙₑ) = 1.52 atm

Pressure of He (Pₕₑ) = 1.01 atm

Total pressure (Pₜ) = 3.27 atm

Pressure of Ar (Pₐᵣ) =?

Pₜ = Pₙₑ + Pₕₑ + Pₐᵣ

3.27 = 1.52 + 1.01 + Pₐᵣ

3.27 = 2.53 + Pₐᵣ

Collect like terms

3.27 – 2.53 = Pₐᵣ

Pₐᵣ = 0.74 atm

Thus the partial pressure of Ar is 0.74 atm.

A student bends a paperclip rapidly back and forth when he touches the point where he was bending the paperclip, he finds that its temperature has increased because temprature goes up at the point of the bending

Temprature is the degree of hotness and coldness and here when student  bends a paperclip rapidly back and forth he touches the point where he was bending the paperclip then the temprature is increases because of temprature goes up at the point of the bending and molecule of clip start moving slower

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Answer:

All living things are organized into groups by scientists as they are identified. Living things organized into particular groups have common characteristics. Overall, the reason scientists classify living things is to understand the relationships between different organisms

Explanation: Naruto

Answer:

C

Explanation:

look at the attachment

Answer:

"The number of air molecules above a surface determines air pressure. As the number of molecules increases, they exert more pressure on a surface, and the total atmospheric pressure increases. By contrast, if the number of molecules decreases, so too does the air pressure."

Answer:

D. It is supported by adequate data

Explanation:

A theory is a well-substantiated explanation

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Answer: an iceberg

Explanation: the reason for this is because it has much more mass then a hot cup of coffee even the the temputure of coffee is much warmer

Answer:

Plugging in the numbers we find the average force to be Favg=18,436 N, which is equivalent to 4124 lbs of force. The impulse delivered by this force is the product of the average force the the contact time, resulting in an impulse of 12.91 Ns.

Answer:

the force multiplied by the time the objects are in contact

Explanation:

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The empirical formula represents the simplest, most reduced ratio of elements in a compound, while the molecular formula provides the actual number of atoms of each element in a molecule.

The empirical formula gives a simplified representation of the elemental composition, while the molecular formula provides the precise number of atoms in a molecule.

The empirical formula is useful for comparing the relative ratios of elements, while the molecular formula provides more detailed information about the compound's structure and composition.

The empirical formula gives the relative ratio of atoms of each element in a compound. It represents the simplest whole-number ratio of the elements present.

For example, the empirical formula of glucose is CH2O, indicating that the ratio of carbon to hydrogen to oxygen atoms is 1:2:1.

On the other hand, the molecular formula provides the actual number of atoms of each element in a molecule. It gives the specific arrangement and composition of atoms in a compound.

Using the example of glucose, the molecular formula is C6H12O6, showing that each molecule of glucose consists of six carbon atoms, twelve hydrogen atoms, and six oxygen atoms.

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Answer:

Explanation:

what are the statments i can't help till i have the posable answers

The specific heat capacity of the nickel metal is 0.45.

Let us recall that the specific heat capacity is used to describe the amount of the quantity of heat that is able to cause the temperature of a unit mass of a substance to increase by 1 kelvin.

Now we know that the heat that is lost by the metal is equal to the heat that is gained by the water as such we have;

mcwdT = -mcmdT

cm = mcwdT/mdT

cm = Heat capacity of the metal

cw = Heat capacity of the water

m = mass of the metal and the water

dT = temperature change

To obtain the heat capacity;

cm = 150 * 4.2 * (25 - 23.5)/-28.2 * (25.0 - 99.8)

cm = 945/2109.4

cm = 0.45

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concept employed

According to the Bohr model, electrons orbit the nucleus at constant energies. Higher energy levels are present in orbits that are farther from the nucleus. Light is released as energy when electrons drop to a lower energy level.

1) With electron energy levels specified by the formula -k/n2, where k is a constant and n is the primary quantum number of the specific level the electron is occupying (usually, ground state, unless perturbed).

2) Assume that the electron in this problem is being moved between the three numbered energy levels; otherwise, you would need to use the additional data that E1 = -13.6 eV. However, since you were unaware of this, the energy levels of the electron must have been clearly defined.

3) The variations in the energies of those energy levels are represented by the wavelengths of the absorbed and emitted light. The n1 level has energy 1/n12, and the n2 level has energy 1/n22, assuming the ground state has reference energy of 1/12 (omit the minus sign for convenience throughout).

4) Now, simply translate the two energy changes into ratios: The ratio is reversed in relation to the corresponding energy level differences for 388.8/94.57nm since the energies are reciprocal to the wavelengths = 3.87142 = (1-1/n1^2)/(1/n1^2 - 1/n2^2 ) . All that remains is more algebraic labor; first, create the common denominators, and then eliminate all of the (n1 + n2) common denominators. Thus, n22*(n12 -1) / (n22 - n12) = 3.87142 is obtained.

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The pH of the hydrochloric acid solution, made by dissolving 0.45 g of HCl in 6.0 L of water, is approximately 2.68. This is determined by calculating the molarity of HCl.

To calculate the pH of the hydrochloric acid (HCl) solution, we need to consider the dissociation of HCl in water. HCl dissociates completely into H+ ions and Cl- ions. The concentration of H+ ions will determine the pH of the solution.

First, we need to calculate the number of moles of HCl in the solution. The molar mass of HCl is 36.46 g/mol. Therefore, the number of moles can be calculated as:

moles = mass / molar mass = 0.45 g / 36.46 g/mol ≈ 0.0124 mol

Next, we calculate the molarity of the HCl solution:

Molarity = moles / volume = 0.0124 mol / 6.0 L = 0.00207 M

Since HCl is a strong acid, it dissociates completely in water, meaning that the concentration of H+ ions is equal to the molarity of the HCl solution. Therefore, the concentration of H+ ions is 0.00207 M.

Finally, we can calculate the pH using the formula:

pH = -log[H+]

pH = -log(0.00207) ≈ 2.68

Therefore, the pH of the hydrochloric acid solution is approximately 2.68.

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Answer:

The molecular formula tell us what elements the atoms are, and how many moles and atoms are attributed toward each element. For example, molecular formula of glucose is . That means one molecule of glucose has 6 molecules of C, 12 molecules of hydrogen and 6 molecules of oxygen.  

The structural formula of a chemical compound is a graphic representation of the molecular structure.

Electron dot diagram or a Lewis diagram or a Lewis structure.

Explanation:

Chefs sauté garlic and onions in butter before using them in recipes primarily because their flavors and/or odors are fat-soluble. This process helps to enhance the taste and aroma of the dish.

Garlic and onions contain volatile compounds that contribute to their distinct flavours and aromas. These compounds are soluble in fats and oils rather than in water. By sautéing them in butter, which is a fat, these compounds are released and dissolved, allowing their flavours to infuse into the dish. The fat-soluble nature of these compounds enables them to disperse more evenly and intensify the overall taste profile of the recipe. Additionally, sautéing garlic and onions in butter also helps to soften their texture and mellow their flavours. The gentle cooking process allows the natural sugars in onions to caramelize, resulting in a sweeter taste. It also helps to reduce the pungency and sharpness of garlic, making it more palatable.

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The reaction that is occurring in this question is:

H2 + I2 -> 2 HI

As we can see, the molar ratio for H2 and I2 is 1:1, one mole of H2 for each mole of I2, and the molar ratio between any reactant and HI is 1:2, which means the number of moles of product will be two times more than the number of moles of the reactants

We have:

3.0 moles of H2

2.0 moles of I2

1.0 moles of HI

According to the molar ratio, we should have the name number of moles of I2 and H2, which means that H2 is in excess and I2 is the limiting reactant with 2 moles

If we have 2 moles of I2, and the molar ratio of I2 and HI is 1:2, we should have 4 moles of HI being produced

Therefore the theoretical number of moles is 4.0 moles of HI from 2.0 moles of I2

Answer:

\(\boxed {\boxed {\sf 232.9 \textdegree C}}\)

Explanation:

This question asks us to find the temperature change given a volume change. We will use Charles's Law, which states the volume of a gas is directly proportional to the temperature. The formula is:

\(\frac {V_1}{T_1}= \frac{V_2}{T_2}\)

The volume of the gas starts at 250 milliliters and the temperature is 137 °C.

\(\frac{250 \ mL}{137 \textdegree C}= \frac{V_2}{T_2}\)

The volume of the gas is increased to 425 milliliters, but the temperature is unknown.

\(\frac{250 \ mL}{137 \textdegree C}= \frac{425 \ mL}{T_2}\)

We are solving for the new temperature, so we must isolate the variable T₂. First, cross multiply. Multiply the first numerator and second denominator, then multiply the first denominator and second numerator.

\(250 \ mL * T_2 = 137 \textdegree C * 425 \ mL\)

Now the variable is being multiplied by 250 milliliters. The inverse of multiplication is division. Divide both sides of the equation by 250 mL.

\(\frac{250 \ mL * T_2}{250 \ mL}=\frac{ 137 \textdegree C * 425 \ mL}{250 \ mL}\)

\(T_2=\frac{ 137 \textdegree C * 425 \ mL}{250 \ mL}\)

The units of milliliters (mL) cancel.

\(T_2=\frac{ 137 \textdegree C * 425 }{250 }\)

\(T_2= \frac{58225}{250} \textdegree C\)

\(T_2=232.9 \textdegree C\)

The temperature changes to 232.9 degrees Celsius.

Lavoisier believed in the caloric theory.

Caloric was a self-repelling fragment that adhered to matter. The heat was a mysterious fluid stored in the matter and liberate during burning and chemical reactions. Heat walk to cold. Hot objects had caloric and cold had little caloric.

The caloric theory is a disused scientific theory that heat consists of a self-resistant fluid called caloric that flows from hotter bodies to colder bodies. Caloric was also the notion of a weightless gas that could pass in and out of pores in solids and liquids.

So we can conclude that Caloric theory The caloric theory is an outworn scientific theory that heat consists of a fluid called caloric.

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The rate of a chemical reaction computed as the ratio of a measured change in amount or concentration of a substance to the time interval over which the change occurred is known as reaction rate.

Reaction rate refers to how quickly a chemical reaction takes place. It is determined by measuring the change in the amount or concentration of a substance involved in the reaction over a specific time period. The reaction rate is calculated by dividing the measured change by the time interval in which the change occurred. This ratio provides a quantitative measure of the speed at which the reaction is proceeding.

Reaction rates are essential in understanding and studying chemical reactions. They provide insight into the kinetics of a reaction, including the factors that affect its speed. By measuring the rate of a reaction under different conditions, scientists can determine the effect of variables such as temperature, concentration, and catalysts on the reaction rate.

Understanding reaction rates is crucial in various fields, including chemistry, biology, and environmental science. It allows scientists to optimize reaction conditions, design efficient chemical processes, and develop new materials or drugs. Additionally, reaction rates play a significant role in industrial applications, where controlling the speed of reactions is essential for achieving desired outcomes.

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The carbon and nitrogen cycles are related to one another because:

d.  All of these choices are correct.

Chemically, carbon is an element with the symbol C and atomic number 6. Carbon, which is categorized as a nonmetal, is a solid at ambient temperature.

Since it makes up around 78% of the air humans breathe, nitrogen is not poisonous. It does not have a smell, yet it is not safe. chemical that can suffocate a person to death or render them unconscious. Oxygen in the air is replaced by simple aphyxiants like nitrogen.

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Answer:

22

Explanation:

22

A buffer solution is made by mixing 375 ml of 0.25 m hf and 225 ml of 0.50 m naf. The ph of:

the original buffer solution is: 3.24,

the solution after adding 0.018 mol of KOH to the original buffer solution is: 9.85,

the solution after adding 12.5 ml of 1.25 m HI to the original buffer solution is 0.88.

A buffer solution is created by combining a weak acid and its conjugate base, which together maintain a relatively constant pH despite the addition of small amounts of acid or base. In this question, 375 mL of 0.25 M HF and 225 mL of 0.50 M NaF are mixed together to form the buffer solution.

The pH of the original buffer solution can be calculated using the Henderson-Hasselbalch equation, which states that \(pH = pKa + log([A-]/[HA]).\)

In this case, [A-] is the concentration of the conjugate base (NaF) and [HA] is the concentration of the weak acid (HF). Plugging in the values given, the pH of the original buffer solution is 3.24.

After adding 0.018 moles of KOH to the original buffer solution, the pH can be calculated using the same Henderson-Hasselbalch equation. Since KOH is a strong base, the concentration of the conjugate base (NaF) increases and the concentration of the weak acid (HF) decreases. Plugging in the values, the pH of the solution after the addition of KOH is 9.85.

After adding 12.5 mL of 1.25 M HI to the original buffer solution, the pH can be calculated using the Henderson-Hasselbalch equation. Since HI is a strong acid, the concentration of the conjugate base (NaF) decreases and the concentration of the weak acid (HF) increases. Plugging in the values, the pH of the solution after the addition of HI is 0.88.

In conclusion, the original buffer solution had a pH of 3.24, the solution after the addition of 0.018 moles of KOH had a pH of 9.85, and the solution after the addition of 12.5 mL of 1.25 M HI had a pH of 0.88.

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Answer:

A. 7

(assuming the water is neutral)

Answer:

It should be "B"

Explanation:

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