lead crystallizes in a face-centered cubic structure. what is the edge length of the unit cell if the atomic radius of lead is 175

According to the package insert, before reconstitution, varivax should be stored in the freezer. Based on this information, the suitable temperature range for varivax should in between -18 °C (0 °F) and -20 °C (-4 °F).

Based on the information provided, Varivax should be stored in the freezer. Typically, the temperature range for freezer storage is between -18 °C (0 °F) and -20 °C (-4 °F). Therefore, Varivax should be stored within this temperature range until it is ready for reconstitution. It is important to follow the specific storage instructions provided in the package insert to ensure the stability and efficacy of the product.

Hence, Varivax should be stored in the freezer with a temperature range in between -18 °C (0 °F) and -20 °C (-4 °F).

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Answer:

The Big Bang Theory is the leading explanation about how the universe began. At its simplest, it says the universe as we know it started with a small singularity, then inflated over the next 13.8 billion years to the cosmos that we know today.

Explanation:

The concentration of the \(H_2SO_4\) solution is 0.1789 (rounded to 4 decimals).

To calculate the concentration of the \(H_2SO_4\)  solution, we will use the concept of moles and the balanced chemical equation:
\(H_2SO_4\) (aq) + 2 NaOH (aq) → \(Na_2SO_4\) (aq) + \(2H_2O\) (l)
First, find the moles of NaOH:
moles of NaOH = volume (L) × molarity
moles of NaOH = 0.01525 L × 0.5866 M = 0.0089459 moles
Since the stoichiometry in the balanced equation is 1:2 (\(H_2SO_4\):NaOH), divide the moles of NaOH by 2 to find the moles of \(H_2SO_4\):
moles of \(H_2SO_4\) = 0.0089459 moles / 2 = 0.00447295 moles
Now, calculate the molarity of \(H_2SO_4\):
molarity = moles of \(H_2SO_4\) / volume of \(H_2SO_4\) (L)
molarity = 0.00447295 moles / 0.025 L = 0.1789 M
The concentration of the \(H_2SO_4\) solution is 0.1789 (rounded to 4 decimals).

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Answer:

B. Water vapor transfers back to water droplets or ice crystals.

Explanation:

Its What I know ehe sorry in advance if its wrong :))

A triple bond may consist of one sigma bond and two pi bonds.

Sigma bonds are the most powerful kind of covalent chemical bond. they're fashioned by way of head-on overlapping among atomic orbitals. Sigma bonding is most surely described for diatomic molecules the usage of the language and equipment of symmetry businesses

Sigma bond is a covalent bond formed by overlap of atomic orbitals and hybrid orbitals along the bond axis. The sigma bond in the a hydrogen molecule is formed by overlap of a pair of 1s orbitals, one from each hydrogen atom.

The pi bond is the same as that of the p orbital when seen down the bond axis.

A pi bond is a weaker chemical covalent bond than a sigma bond.

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Answer: PLease see answer in explanation column

Explanation:

FIRST STEP

We  find the grams ( mass ) of solute required to prepare the solution by using  the formula

grams ( mass ) of solute, g(CaCl2)= Molar mass x Molarity of the solution x Volume of the solution

Therefore Preparing 750 mL of 1.5 M calcium chloride solution, we have that Molar mass of Calcium chloride =110.98 g/mol

g(CaCl2) =110.98 g/mol X 1.5mol/L X 0.75L

g(CaCl2) =124.8525g CaCl2

SECOND STEP

Now Dissolve 124.8525g CaCl2 in about 350ml of distilled water then add more water until the final volume be comes 750ml

d. The polymorphic form of fat crystals is in a glassy state is NOT true.

The statement that the polymorphic form of fat crystals is in a glassy state is not true. Polymorphism refers to the ability of a substance to exist in multiple crystal structures or forms. Lipids, including fats, can exhibit polymorphism, meaning they can crystallize in different arrangements or crystal forms.

When it comes to the texture of foods containing lipids, the polymorphic form of fat crystals does play a significant role. The specific crystal form and arrangement of the lipids can affect the texture of the food, influencing factors such as mouthfeel, creaminess, and stability.

The solid fat content versus temperature profile is an essential factor in determining texture, as stated in option a. The morphology of the crystals formed, as mentioned in option b, also plays a crucial role in texture. Option c is true as well, as foods containing partially crystalline lipids can exhibit a "plastic" texture.

However, option d is not accurate because the polymorphic form of fat crystals can exist in various states, including crystalline and semi-crystalline states, but not in a glassy state. Glassy states are typically associated with amorphous materials rather than crystalline structures.

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Answer:

In the atmosphere, water particles mix with carbon dioxide sulphur dioxide and nitrogen oxides, this forms a weak acid. Air pollution means that water vapor absorbs more of these gases and becomes even more acidic.

Explanation:

Answer:

A and D

Explanation:

Answer:

A & D

Explanation:

Answer:

String a piece of twine between the cups. Use a long piece of string to help the sound travel farther. Tie a knot in the end of the string to keep it in the cup. Decorate the cups if desired. One person can hold the phone up to their ear and the other person can talk into the other cup. Keep the string tight or the sound waves won’t travel.

Explanation:

NaOH (sodium hydroxide) is a strong base that readily dissociates in water to produce hydroxide ions (OH-) and sodium ions (Na+). In aqueous solutions, NaOH dissociates completely, making it a strong base with a high pH.

NaOH can neutralize acids, such as hydrochloric acid (HCl), sulfuric acid (H2SO4), and nitric acid (HNO3), by reacting with them to produce water (H2O) and a salt. This reaction is called an acid-base neutralization reaction, and it occurs when the hydroxide ions from the NaOH react with the hydrogen ions (H+) from the acid.

In summary, NaOH is a strong base that produces hydroxide ions when dissolved in water. It can neutralize acids by reacting with them to produce water and a salt.

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The pressure in the aluminum scuba tank, containing compressed air at 2.899 x 103 psi, expressed in inches of mercury is approximately 5,908 inHg.

To convert the pressure from psi to inches of mercury, you can use the following conversion factor: 1 psi = 2.036 inches of mercury. Given that the aluminum scuba tank contains compressed air at 2.899 x 10³ psi, you can calculate the pressure in inches of mercury by multiplying the pressure in psi by the conversion factor:

Pressure in inches of mercury = (2.899 x 10³ psi) * (2.036 inHg/psi)

Pressure in inches of mercury ≈ 5,908 inHg

So, the pressure in the aluminum scuba tank expressed in inches of mercury is approximately 5,908 inHg.

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Answer:

D. Thermal

Thermal is another energy the match gives off

The theoretical yield of Fe₂O₃ is 0.0059 moles and the percent Yield is 44.2%

Using stoichiometry to calculate the theoretical yield of Fe₂O₃:

From the balanced chemical equation, 4 moles of Fe react with 3 moles of O₂ to produce 2 moles of Fe₂O₃. Therefore, set up the following proportion:

3.4 g O₂ / 32 g/mol O₂ = x mol Fe₂O₃ / (2 mol Fe / 4 mol O₂ x 55.85 g/mol Fe)

Solving for x:

x = 3.4/32 x 4/3 x 1/55.85 x 2 = 0.0059 moles Fe₂O₃

Therefore, the theoretical yield of Fe₂O₃ is 0.0059 moles.

From the balanced chemical equation, 4 moles of Fe react with 3 moles of O₂ to produce 2 moles of Fe₂O₃. Therefore, for every 4 moles of Fe that react, expect to produce 2 moles of Fe₂O₃.

Using this information, set up the following proportion:

4 mol Fe / 55.85 g/mol Fe = 0.0059 mol Fe₂O₃ / x

Solving for x:

x = 55.85 x 0.0059 / 4 = 0.082 g Fe

Therefore, the theoretical yield of Fe is 0.082 g.

To calculate the percent yield, use the following formula:

Percent Yield = (Actual Yield / Theoretical Yield) x 100%

Substituting the values calculated:

Percent Yield = (0.0059 mol Fe₂O₃ / 0.082 g Fe) x 100% x (1.5 moles H₂O / 2 moles Fe₂O₃)

Percent Yield = 44.2%

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When an object of mass mo is released from rest above the spring, it falls and then makes contact with the top of the spring with a speed v0. The spring then compresses such that the object reaches a position x0 below the spring’s equilibrium position, where the object comes to rest. The object is then directed upward by the spring until it is no longer in contact with the spring. The object then continues upward. The object-spring-earth system has zero gravitational potential energy at the instant shown in figure 2. All frictional forces are considered to be negligible.

According to the law of conservation of mechanical energy, the sum of kinetic and potential energies in the system should be constant. Thus, when the object falls, it loses gravitational potential energy and gains kinetic energy. The kinetic energy gained is given as1/2 mo v0^2Where mo is the mass of the object, and v0 is the speed with which the object comes in contact with the spring. When the spring is compressed to x0 below its equilibrium position, the kinetic energy is converted into the spring potential energy, which is given as1/2 k0 x0^2Where k0 is the spring constant, and x0 is the displacement of the spring from its equilibrium position. The spring potential energy is at its maximum value when the spring is fully compressed and the object comes to rest.At this point, all the kinetic energy has been converted into spring potential energy. The object then starts moving upward. At the point where the spring has been fully extended, the object's potential energy is at its maximum value. However, since all the kinetic energy has been converted into spring potential energy, the object's potential energy is equal to the spring potential energy at the point where the spring is fully compressed and the object comes to rest.The object's potential energy is given bymghWhere m is the mass of the object, g is the acceleration due to gravity, and h is the height above some arbitrary reference level.

Thus, the spring potential energy when the spring is fully compressed is equal to the object's potential energy when it reaches its maximum height above the equilibrium position. The initial kinetic energy of the object is equal to the sum of the maximum potential energy of the spring and the maximum potential energy of the object.

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Answer:

The answer is Iron phosphide (Fe2P)

The wavelength of an infrared photon that has a frequency of 2.13 x 10⁹

Hz is 0.14 m.

What is infrared radiation?

          c = ν λ

where

 c = speed of light ⇒ 3×10⁸ m/s

 ν = frequency ( Hz or s⁻¹ ) ⇒ 2.13 x 10⁹ Hz

 λ = wavelength ( m ) ⇒ ?

    substituting the values

    c = ν λ

   λ = c / ν

      = (3×10⁸ m/s) / 2.13  x 10⁹

      = 1.4 x 10⁻¹ m or 0.14 m

Thus we can conclude that the wavelength of an infrared photon that has a frequency of 2.13 x 10⁹Hz is  0.14 m.

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The variable that is unknown until the experiment is performed is the dependent variable.

In a scientific experiment, variables are classified into two main categories: independent variables and dependent variables. The independent variable is the variable that is intentionally manipulated or changed by the experimenter. It is under the control of the experimenter and is deliberately altered to observe its effect on the dependent variable.

On the other hand, the dependent variable is the variable that is measured or observed as the outcome or response in the experiment. It is the variable that is expected to change in response to the manipulation of the independent variable. The value or behavior of the dependent variable depends on the value or behavior of the independent variable.

Typically, before conducting an experiment, researchers have a hypothesis or an expectation about how the independent variable will affect the dependent variable. However, the actual outcome or result of the experiment, which is observed through the measurement of the dependent variable, remains unknown until the experiment is performed.

The purpose of conducting the experiment is to gather empirical data and observe the changes in the dependent variable to analyze the relationship between the independent and dependent variables.

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The molarity of the iodine in the solution prepared by dissolving 5.15 g of iodine to make a 225 mL solution is 0.178 M

First, we shall obtain the mole in 5.15 g of iodine

Mole = mass / molar mass

Mole of iodine = 5.15 / 126.9

Mole of iodine = 0.04 mole

Now, we shall determine the molarity of the iodine in the solution. Details below:

Molarity of solution = mole / volume

Molarity of iodine = 0.04 / 0.225

Molarity of iodine = 0.178 M

Thus, we can conclude that the molarity of the iodine in the solution is 0.178 M

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Given the symbol Cl-37, the element is Cl, but there is no information about its charge. When this is like that, it is implicit it is an atom, that is, it is neutral, its charge is 0.

The number indicates is the mass number, so its mass is 37.

So, mass is 37 and charge is 0.

Answer:

The electronic configuration of ions formed are:

Li+ (2) => 1s2

Cl- (18) => 1s2 2s2 2p6 3s2 3p6

Explanation:

Lithium metal, Li will lose 1 electron to lithium ion Li+. Chlorine atom, Cl will receive the 1 electron to form the chloride ion Cl- as shown by the following equation below:

Li —> Li+ + e

Cl+ e —> Cl-

Combine both equation

Li + Cl + e —> Li+ + Cl- + e

Cancel out 'e'

Li + Cl —> Li+ Cl-

Thus, we can write the electronic configuration for the reaction as follow:

Before reaction:

Li (3) => 1s2 2s1

Cl (17) => 1s2 2s2 2p6 3s2 3p5

After reaction

Li+ (2) => 1s2

Cl- (18) => 1s2 2s2 2p6 3s2 3p6

Therefore, the electronic configuration of the ions formed are:

Li+ (2) => 1s2

Cl- (18) => 1s2 2s2 2p6 3s2 3p6

Answer:

Chemical Changes are also called Chemical Reactions. Chemical reactions involve combining different substances. The chemical reaction produces a new substance with new and different physical and chemical properties. Matter is never destroyed or created in chemical reactions.

Explanation:

Answer: +6 to +3

Explanation:

      If something gains an electron, the charge will decrease by -1 because electrons have a negative charge. If it loses an electron, its charge will increase by +1.

             +6 to +3 ➜ Gained 3

             +3 to +7 ➜ Lost 4

             0 to +4 ➜ Lost 4

             +1 to 0 ➜ Gained 1

      Using this information, the species with the charge change of +6 to +3 gained the most electrons in a redox reaction.

Answer:

Due to presence of a triple bond between the two N−atoms, the bond dissociation enthalpy (941.4 kJ mol  

−1

) is very high. Hence, N  

2

​

 is the least reactive.

Magnesium chloride crystals can be formed by reacting an insoluble base with an acid. The reaction can be represented by the following equation:

In this reaction, magnesium hydroxide (Mg(OH)₂) is the insoluble base and hydrochloric acid (HCl) is the acid. When these two substances react, they produce magnesium chloride (MgCl₂) and water (H₂O).

The magnesium chloride formed in this reaction is in the form of crystals. The crystals form because the reaction produces an excess of ions, which then attract to each other and form a lattice-like structure. This is known as crystallization. The magnesium chloride crystals are colorless and have a salty taste.

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Answer:  -2m/s2

Explanation:

Using the following equation ; acceleration = Change in velocity / time

i.e  a =  v - u / t

where  'a'  = acceleration

              v  = final velocity

              u  =  initial velocity

              t   =  time

Therefore;  from the graph we have acceleration to be, 0 - 6m/s / 3s  = -2m/s2

Answer:

Truck crashes into a car

Explanation:

Mass number is the sum of the numbers of protons and neutrons present in the nucleus of an atom.