A vessel containing the following gases is analyzed by a scientist:He, Ne, Ar, KrWhich of the following gases would be moving the slowest?A) NeB) ArC) KrD) He

The pH of the solutions are as follows:

a. pH = 4.4

b. pH = 0.2

The pH of a solution is a measure of the acidity or basicity of a solution.

The pH is defined as the negative logarithm of the hydrogen ion concentration of a substance.

pH = -log [H⁺]

where [H⁺] is the hydrogen ion concentration

The pH of the solutions are as follows:

a.  150.0 ml of a 3.5 x 10⁻⁵ M HNO3.

pH = -log (3.5 x 10⁻⁵)

pH = 4.4

b. 250.0 ml of a 0.63 M solution of HNO2

pH = -log (0.63)

pH = 0.2

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134.3 liters of oxygen gas at STP could be produced from 500.0 g of potassium chlorate.

We can use the ideal gas law to find the volume of hydrogen at STP (standard temperature and pressure, 0°C and 1 atm) that would contain 58.7 moles: PV = nRT

(1 atm) V = (58.7 mol) (0.08206 L atm/mol K) (273.15 K), V = 1,275 L

Finally, we can use the ideal gas law to calculate the volume of O2 produced at STP (standard temperature and pressure, which is 0°C and 1 atm):

PV = nRT

V = nRT / P

V = (6.12 mol)(0.0821 L•atm/mol•K)(273 K) / 1 atm

V = 134.3 L

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The density of the solid block is 3.79 * 10⁻³ g/cm³.

The density of a substance is defined as the ratio of mass and volume of a substance.

Density measure how close together the particles of a given mass of a substance is. Substances with high density have greater masses compared to the volume of those substances whereas substances with low densities have greater volume compared to their masses.

The volume of the solid block = 78 * 55 * 35 = 150150 cm³

mass of solid block = 569 g

Density of the solid block = 569 g/150150 cm³

Density of the solid block = 3.79 * 10⁻³ g/cm³

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Answer:

limiting reagent is 02

mass of CO2 is 11g

Explanation:

the limiting reagent is the reagent which is consumed completely

no of mole of CH2 = m in g / molar mass

= 46.0/(12+2)

= 3.285 moles.

no of mole of O2 = 32/32

= 1 mole

from the reaction

1 mole of CH2 ==> 2 mol of O2

3.285 mol ==> 1/2 mol

3.285 mol ==> 0.5 mol

:. since O2 has the lowest mol , it's the limiting reagent

the limiting reagent mol will be used to find the no of mole of CH2

2 mol of O2==> 1 mol of CO2

0.5 mol ==> 0.5/2

0.25 mole of CO2

mass = 0.25 * ( 12+32)

= 11g

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A 7.99 g sample of sodium bromide contains 1.786 g of sodium.

Since the percentage of sodium in NaBr is given, we can calculate the mass of sodium and bromide in the 14.47 g sample as follows:

Mass of sodium = 22.34% × 14.47 g = 3.23 g

Mass of bromide = 14.47 g - 3.23 g = 11.24 g

Now, we need to find the mass of sodium in a 7.99 g sample of sodium bromide. We can use the proportion:

Mass of sodium / Mass of NaBr = Mass of sodium in 7.99 g NaBr / 7.99 g

Rearranging and substituting the values, we get:

3.23 g / 14.47 g = x / 7.99 g

Solving for x, we get:

x = 3.23 g × 7.99 g / 14.47 g = 1.786 g

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The mass percentage of C in morphine would be 4.21%.

The mass percentage of a composition in a compound is the mass of the composition relative to the mass of the entire compound. This can be mathematically expressed as:

Mass percentage = mass of component/mass of substance x 100%

In this case, we are looking for the mass percentage of C in \(C_{17}H_{19}NO_3\).

Molar weight of C = 12 g/mol

Molar mass of  \(C_{17}H_{19}NO_3\) = (12x17) + (1x19) + (14x1) + (16x3)

                                             = 285 g/mol

Mass percentage of C = 12/285

                                     = 4.21% to 2 decimal places.

In other words, the mass percentage of C in morphine is 4.21%.

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In a  voltaic cell, if we attach the negative terminal of a dry cell (1.5 V) to the cell cathode and the positive terminal to the cell anode, there will be oxidation of the Cd and reduction of Cr

What is meant by voltaic cells?

A voltaic cell is an electrochemical cell that produces electrical energy using a chemical reaction. The reactions to oxidation and reduction are divided into half-cell compartments.

The oxidation occurs in the Cd electrode, which is the anode, and it gets oxidized to Cd²⁺ (aq). Hence, the Cd electrode loses mass as the cell reaction moves forward.  

A voltaic cell is an electrochemical cell that uses a chemical response to produce electric energy. The crucial components of a voltaic mobile: The anode is an electrode where oxidation occurs. The cathode is an electrode where a discount occurs. A galvanic cell or voltaic cellular, named after the scientists Luigi Galvani and Alessandro Volta, respectively, is an electrochemical cellular wherein an electric-powered modern is generated from spontaneous Oxidation-reduction reactions.

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The mass of oxygen required is 17.06 g; the mass of carbon dioxide produced is 300 g; the mass of copper (ii) nitrate produced is 16.7 g.

The equation of the synthesis of water from hydrogen and oxygen is given as follows:

The grams of oxygen required is given below:

\(19.2 g\:of H_{2} \times\frac{1\:mol H_{2}}{18 g\:H_{2}} \times\frac{1mol\:O_{2}}{2 mol\:H_{2}}\times\frac{32g\:O_{2}}{1 mol\:O_{2}} = 17.06 g\: O_{2}\)

The equation of the combustion of propane is given as follows:

\(C_{3}H_{8} + 5\:O_{2}\rightarrow3\:CO_{2}+4\:H_{2}O\)

The mass of carbon dioxide produced is given below:

\(100 g\:of\:C_{3}H_{8} \times\frac{1\:mol\:C_{3}H_{8}}{44 g\:C_{3}H_{8}} \times\frac{3\:mol\:CO_{2}}{1\:mol\:C_{3}H_{8}}\times\frac{44g\:CO_{2}}{1 mol\:CO_{2}} = 300 g\:CO_{2}\)

The equation of the reaction of copper and silver nitrate is given as follows:

\(Cu + 2\:AgNO_{3}\rightarrow Cu(NO_{3})_{2} + 2\:Ag\)

\(5.7 g\:Cu \times\frac{1\:mol\:Cu}{64 g\:Cu} \times\frac{1mol\:Cu(NO_{3})_{2}}{1mol\:Cu}\times\frac{188g\:Cu(NO_{3})_{2}}{1 mol\:Cu(NO_{3})_{2}} = 16.7 g\:Cu(NO_{3})_{2}\)

Therefore, the mass of oxygen required is 17.06 g; the mass of carbon dioxide produced is 300 g; the mass of copper (ii) nitrate produced is 16.7 g.

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Answer:

density

Explanation:

Density is an important measurement. It has an unit: g/mL or kg/L, ...

Evaporation, freezing, melting are the processes in which the substances change their states. Other processes are: condensation, sublimation, deposition.

...

Hope this answer can help you. Have a nice day!

The general method/rule/formula for calculating where a ball will land depends on various factors such as the initial velocity, angle of projection, air resistance, and gravity.

In general, the most common method to calculate the landing position of a projectile is to use the kinematic equations of motion, which relate the position, velocity, and acceleration of an object. These equations can be used to determine the time it takes for the ball to hit the ground and the horizontal distance it travels during that time.

However, the calculation can become more complex when considering factors like air resistance and varying conditions, and may require more advanced mathematical models.

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In redox reactions, an oxidation half reaction shows the oxusetoon occurring while the reduction half reaction shows the reduction occurring in the overall reaction.

Redox reactions are reactions in which oxidation and reduction reactions occur together to the same extent.

A redox reaction can be split into two half oxidation and reduction reactions.

The half reactions of the given reactions are shown below:

Overall reaction;

\(A. Mg(s) + CoBr_2(aq) ⟶ MgBr_2(aq) + Co(s) \\ \)

Oxidation half reaction:

\(Mg (s) ---> Mg ^{2+}(aq)\)

Reduction half reaction:

\(Co^{2+} (aq) ---> Co (s)\)

B. Overall reaction

\(Cu(s) + 2AuCl(aq) ⟶ CuCl_2(aq) + 2Au(s) \\ \)

Oxidation half reaction:

\(Cu(s) ---> Cu^{2+}(aq)\)

Reduction half reaction:

\(2Au^{+}(aq) ---> 2 Au (s)\)

Therefore, redox equations can be spilt into oxidation and reduction half reactions.

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The sequence of events used to process film in film photography s:

The practice of shooting pictures on the thin, clear plastic strips we refer to as film is known as film photography. The contrast and resolution of a photograph are determined by the gelatin emulsion that is coated on one side of the film strip. This emulsion contains tiny silver halide crystals.

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Answer:

Processing film starts with you loading a film reel and putting it in a light tight tank.

You will then do these steps in order for set times: water presoak, developer, stop bath, fixer, first wash, fixer remover, final wash, wetting agent, and then finally drying your film.

Explanation:

Took the test.

The value of the rate constant at 9.30×102 K is 2.03×102 s–1.

To solve this problem, we can use the Arrhenius equation:

k = A * exp(-Ea/RT)

where:

k = rate constant

A = pre-exponential factor or frequency factor

Ea = activation energy

R = gas constant (8.314 J/mol·K)

T = temperature in Kelvin

We can rearrange this equation to solve for the rate constant at the new temperature:

k2 = A * exp(-Ea/RT2)

where k2 is the rate constant at the new temperature T2.

We are given k1 = 3.241×10-5 s–1 at T1 = 800 K, and Ea = 255 kJ/mol. We need to find k2 at T2 = 9.30×102 K.

To find A, we can rearrange the Arrhenius equation to solve for A:

A = k / exp(-Ea/RT)

Using k1 and T1, we get:

A = 3.241×10-5 s–1 / exp(-255000 J/mol / (8.314 J/mol·K * 800 K))

A = 7.07×1013 s–1

Now we can use A, Ea, k1, and T2 to find k2:

k2 = A * exp(-Ea/RT2)

k2 = 7.07×1013 s–1 * exp(-255000 J/mol / (8.314 J/mol·K * 930 K))

k2 = 2.03×102 s–1

Therefore, the value of the rate constant at 9.30×102 K is 2.03×102 s–1. using Arrhenius equation.

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Answer:

10

Explanation:

no explanation need thats the right answer i gotchu g

Answer:10

Explanation:

no explanation need thats the right answer

A balanced equation may be used to describe this reaction:

HC=C(aq) + H2O(l) ⇌ H3C+C-(aq) + OH-(aq)

The Brnsted-Lowry hypothesis is an acid-base reaction theory that was separately proposed in 1923 by Johannes Nicolaus Brnsted and Thomas Martin Lowry. In a chemistry, a Brnsted-Lowry base is a molecule or ion that accepts a hydrogen ion. Because a hydrogen ion is often referred to as a proton, acids and bases are proton donors and acceptors, according to the Brnsted-Lowry definition.

Here,

The acetylide ion (HC=C) acts as a Brønsted-Lowry base in water, accepting a proton from water to form an acetylene cation (H3C+C-):

HC=C + H2O ⇌ H3C+C- + OH-

This reaction can be written as a balanced equation:

HC=C(aq) + H2O(l) ⇌ H3C+C-(aq) + OH-(aq)

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The volume of hydrogen gas produced is 19.8 L.

The balanced chemical equation is given as;

Zn + 2HCl → ZnCl₂ + H₂

from the reaction above;

1 mole of Zn = 1 mole of H₂

number of mole of 48.5 g Zn  is calculated as

48.5 g  /65.4 g/mol

= 0.74 mol Zn  = 0.74 mol H₂

The volume of hydrogen gas produced is calculated as follows;

PV = nRT

where;

T = 27°C + 273 = 300 K

V = nRT/P

V = (0.74 x 0.08206 x 300) / (0.921)

V = 19.8 L

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The arrow in a chemical equation represents the direction of the reaction. It indicates the conversion of reactants into products. The arrow points from the reactant side to the product side, symbolizing the flow of the reaction.

The purpose of the arrow is to visually represent the chemical transformation occurring in the reaction. It shows the relationship between the reactants and products and the direction in which the reaction proceeds. The arrow implies that the reactant molecules are being rearranged and transformed into new substances with different properties.

Chemical equations are used to describe the stoichiometry and balance of reactions. The arrow helps convey this information by illustrating the overall process taking place. It serves as a crucial element in understanding the reaction's composition, reaction conditions, and the substances involved.

Furthermore, the arrow also implies that the reaction can occur in both directions. In reversible reactions, the arrow can be represented as a double-headed arrow, indicating that the reaction can proceed in either direction depending on the conditions.

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Answer:

lack of sunlight, overcrowded region for shelter of the plants, no nutrients and water supply, etc.

Explanation:

The plants needs favorable climatic conditions and nutrient to grow. Plants need air, sunlight, water, proper temperature, nutrients, etc. grow and make their food. They make their food with the help of sunlight and carbon dioxide by a process called as photosynthesis.

Now in the context, Amy is setting up an experiment where she will study the growth of plants in two models. One in the normal growing conditions and the other in a drought condition.

Drought is considered the most important abiotic factor that limits the growth and adversely affects the growth and the crop. The factor that is important for Amy to change the model into a drought conditions is the lack of water and carbon dioxide in the atmosphere. Also scarcity of sunlight and nutrients. The drought stress is considered as one of the crop performance limiting factors.

The mass per volume concentration is obtained as 30%.

We know that the concentration has to do with the amount of substance that can be found in the solution. In this case, the concentration here has been expressed as the mass per volume concentration.

If 30 g of the solid dissolves in 100 mL of the water

x g dissolves in 106.4 mL of the solution

x = 30 * 106.4/100

x = 31.92 g

The mass per volume concentration now becomes;

31.92 g/106.4 mL * 100/1

= 30%

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Answer:

[Ne]3s²

Explanation:

Mg

1s2 2s2 2p6 3s2   or [Ne]3s²

Abbreviated electronic configuration of magnesium is [Ne]3 s² and in complete form it is 1 s² 2 s² 2 p⁶ 3 s².

Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.

Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.

Elements undergo chemical reactions in order to achieve stability. Main group elements obey the octet rule in their electronic configuration while the transition elements follow the 18 electron rule. Noble elements have valence shell complete in ground state and hence are said to be stable.

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Answer:

C.) It is the functional group that distinguishes one amino acid from another.

Explanation:

An R group is also known as a random group and is one of the key components of an amino acid. It contributes to their wide variety.

The role of an R group in an amino acid as It is the functional group that distinguishes one amino acid from another. Option C is correct.

The functional groups are the some groups of chemicals oh hydrogen and notrgen and oxygen or carbon combination like carboxylic acid they are combination of carbon and amines as they are amnio groups etc.

The R attached at the end represents the different functional gropus of amino acids in the chain of hydrocarbon compound or orgamic compounds as they are primay and secondry and tertiary amines.

Therefore, Option C is correct.The role of an R group in an amino acid as It is the functional group that distinguishes one amino acid from another.

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The mass, in grams of 1.16 mole of water, H₂O is 20.88 g

The mole of a substance is related to it's mass and molar mass according to the following equation

Mole = mass / molar mass

With the above formula, we can obtain the mass of H₂O

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

The mass of 1.16 mole of water can be obtained as illustrated below:

Mole = mass / molar mass

Cross multiply

Mass = mole × molar mass

Mass of H₂O = 1.16 × 18

Mass of H₂O = 20.88 g

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Answer:

I believe it is Mass of marbles this may be wrong

Explanation:

Answer:

b

Explanation:

Mangrove trees' robust roots aid in stabilizing the soil and preventing soil erosion. This is especially crucial in swampy coastal locations, where the soil is frequently loose and prone to wind and wave erosion. Mangrove trees work to stabilize the coastline and stop land erosion by securing the soil in place.

Mangrove trees also aid in removing contaminants from the water, enhancing the quality of the water in coastal areas while serving as an essential home for a variety of wildlife species. Mangrove trees contribute significantly to environmental protection and are an essential component of coastal ecosystems.

Mangrove trees are crucial for environmental preservation because they hold the soil in place and stop erosion in marshy coastal areas. They also provide crucial habitats for numerous wildlife species, stabilize the coastline, and stop the land from being lost to erosion while enhancing water quality by filtering pollutants from the ocean.

Mangrove trees are an essential part of coastal ecosystems overall, and preserving them is essential for preserving a healthy and sustainable environment.

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Answer: The best option to answer this question is the first one, "T"

Explanation:

The question requires us to choose, among the options given, the appropriate variable for the value "250 K".

Considering that 250 K corresponds to the value 250 Kelvin degrees, and assuming that the letters given in the options correspond to Temperature (for T), Pressure (for P), number of moles (for n), and Volume (for V), we can say that the variable temperature (T) is the most appropriate for the value given, as Kelvin degrees (or simply K) corresponds to a unit to measure temperature.

Therefore, the best option to answer this question is the first one, "T".

Answer: The mass of water produced is 180.02 g

Explanation:

The number of moles is defined as the ratio of the mass of a substance to its molar mass.

The equation used is:

\(\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}\) ......(1)

Given mass of HF = 600.0 g

Molar mass of HF = 20.01 g/mol

Plugging values in equation 1:

\(\text{Moles of HF}=\frac{600.0g}{20.01g/mol}=29.98 mol\)

The given chemical equation follows:

\(SiO_2+6HF\rightarrow H_2SiF_6+2H_2O\)

By the stoichiometry of the reaction:

If 6 moles of HF produces 2 moles of water

So, 29.98 moles of HF will produce = \(\frac{2}{6}\times 29.98=9.99mol\) of water

Molar mass of water = 18.02 g/mol

Plugging values in equation 1:

\(\text{Mass of water}=(9.99mol\times 18.02g/mol)=180.02g\)

Hence, the mass of water produced is 180.02 g

Answer:

metamorphic

Explanation:

igneous is when the magma is cooling down, sedimentary is when the are formed by cementing underground. that is why the answer is metamophic

The rock that is most likely to form because of high heat and pressure is known as metamorphic rock. Thus, the correct option for this question is D.

The rock cycle may be defined as a type of cycle that involves the continuous process through which rocks are constructed, altered from one form to another, destroyed, and then formed again by the action of numerous external factors.

If a rock is exposed to great heat and extreme pressure, it undergoes metamorphism. Due to this, the rock does not melt all the way but it changes to a metamorphic rock that may significantly possess new mineral composition and texture.

Metamorphic rocks are rocks that have been altered from their original structure and properties to another due to immense heat and pressure effects.

Therefore, the rock that is most likely to form because of high heat and pressure is known as metamorphic rock. Thus, the correct option for this question is D.

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6.02 x \(10^{20\) formula units of MgCl₂ is equal to 0.1 moles of MgCl₂.

To convert formula units of MgCl₂ to moles of MgCl₂, we need to use Avogadro's number, which relates the number of formula units to the number of moles.

Avogadro's number (NA) is approximately 6.022 x 10^23 formula units per mole.

Given that we have 6.02 x 10^20 formula units of MgCl₂, we can set up a conversion factor to convert to moles:

(6.02 x 10^20 formula units MgCl₂) * (1 mol MgCl₂ / (6.022 x 10^23 formula units MgCl₂))

The formula units of MgCl₂ cancel out, and we are left with moles of MgCl₂:

(6.02 x 10^20) * (1 mol / 6.022 x 10^23) = 0.1 mol

Therefore, 6.02 x 10^20 formula units of MgCl₂ is equal to 0.1 moles of MgCl₂.

It's important to note that this conversion assumes that each formula unit of MgCl₂ represents one mole of MgCl₂. This is based on the stoichiometry of the compound, where there is one mole of MgCl₂ for every one formula unit.

Additionally, this conversion is valid for any substance, not just MgCl₂, as long as you know the value of Avogadro's number and the number of formula units or particles you have.

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