copper, x-rays of frequency 2.74 × 10^19 Hz
are emitted. What is the wavelength of these
x-rays?
Answer in units of pm.

Answer:

B

Explanation:

Answer: The final temperature is \(38.0^0C\)

Explanation:

The quantity of heat required to raise the temperature of a substance by one degree Celsius is called the specific heat capacity.

\(heat_{released}=heat_{absorbed}\)

\(Q=m\times c\times \Delta T=m\times c\times (T_{final}-T_{initial})\)

\(-[m_1\times c_1\times (T_{final}-T_1)]=[m_2\times c_2\times (T_{final}-T_2)]\)

\(-[m_1\times (T_{final}-T_1)]=[m_2\times (T_{final}-T_2)]\)   (as \(c_1=c_2\))

Q = heat absorbed or released

\(m_1\) = mass of water at \(85.0^0C\) = \(volume\times density=41.0ml\times 1g/ml=41.0g\)

\(m_2\) = mass of water at \(26.0^0C\) = \(volume\times density=161.0ml\times 1g/ml=161.0g\)

\(T_{final}\)  = final temperature = ?

\(T_1\)   = temperature of 41.0 ml of water = \(85.0^0C\)

\(T_2\)   = temperature of 161.0 ml of water = \(26.0^0C\)

Now put all the given values, we get

\(-[41.0\times (T_f-85.0)^0C]=161.0\times (T_f-26.0)^0C\)

\(T_f=38.0^0C\)

Thus the final temperature is \(38.0^0C\)

According to the forces of attraction and data collected,particles in substance Z  has greatest amount of kinetic energy.

Forces of attraction  is a force by which atoms in a molecule  combine. it is basically an attractive force in nature.  It can act between an ion  and an atom as well.It varies for different states  of matter that is solids, liquids and gases.

The forces of attraction are maximum in solids as  the molecules present in solid are tightly held while it is minimum in gases as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.

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Your question is incomplete, but most probably your full question was,Sayid recorded the temperatures of four substances in a chart.

Which conclusion is best supported by the data?

The particles in substance W have a greater average kinetic energy than the particles in substance Z.

The particles in substance X have a greater average kinetic energy than the particles in substance Z.

The particles in substance W have a lower average kinetic energy than the particles in substance X.

The particles in substance Z have a lower average kinetic energy than the particles in substance Y

Answer: Molar heat capacity C = 136.09 JK-1mole-1

Explanation:

Heat capacity,  C = Q/ ΔT

where C = heat capacity

Q =heat energy=  Q = 330 J

ΔT is temperature difference =Change in temp =

ΔT = (28.7  +273)-( 21 + 273)= 7.7 K

But

No. of moles of benzene= mass / molar mass

  = 24.6g / 78.11g/mol

     = 0.3149 moles

Molar heat capacity C = Q/ nΔT

                             = 330 / ( 0.3149 x 7.7 )

                             = 136.09 JK-1mole-1

Answer:

ok, here is your answer

Explanation:

AI-generated answer

To find the mass of oxygen that reacted, we need to use the Law of Conservation of Mass, which states that in a chemical reaction, the mass of the reactants equals the mass of the products.

First, we need to find the number of moles of hydrogen that reacted:

Molar mass of hydrogen (H₂) = 2.016 g/mol

Number of moles of H₂ = mass/molar mass = 46.2 g/2.016 g/mol = 22.92 mol

Next, we need to use the balanced chemical equation to find the number of moles of water produced:

hydrogen + oxygen → water

2H₂ + O₂ → 2H₂O

From the equation, we can see that for every 2 moles of H₂, 1 mole of O₂ is required to produce 2 moles of H₂O. Therefore, the number of moles of O₂ required to produce 22.92 moles of H₂O is:

Number of moles of O₂ = 1/2 x 22.92 mol = 11.46 mol

Finally, we can find the mass of oxygen that reacted by using its molar mass:

Molar mass of oxygen (O₂) = 32.00 g/mol

Mass of oxygen = number of moles x molar mass = 11.46 mol x 32.00 g/mol = 366.72 g

Therefore, the mass of oxygen that reacted is 366.72 g.

Answer:

i think thats correcr!

Explanation:

Answer:

Ba>Sn>Pb>As>S

Explanation:

Hello,

In this case, we can write the atomic radius for the given elements:

\(r_{Ba}=268pm\\r_{Sn}=225pm\\r_{S}=100pm\\r_{Pb}=202pm\\r_{As}=185pm\)

In such a way, the required order is:

Ba>Sn>Pb>As>S

This is also in agreement as a periodic trend which states that the higher the period, the higher the radius.

Regards.

2. The pH is 4.22 × 10⁸. 3. pH is 7, 4. pOH is 9.7, 5. diprotic is explained below, 6. Amphoteric is explained below, 7. pH meter, 8. A buffer solution is explained below, 9. Titration is explained below, 10. Difference between strong and weak acids is explained below.

2. pH = -log[H⁺]

pH = -log(4.22 x 10⁻⁸)

pH ≈ 7.375

3. pH + pOH = 14

pH + 7 = 14

pH = 14 - 7

pH = 7

4. pH + pOH = 14

pOH = 14 - pH

pOH = 14 - 4.3

pOH ≈ 9.7

Now,

[H⁺] × [OH⁻] = 1.0 x 10⁻¹⁴

[OH⁻] = 1.0 x 10⁻¹⁴ / [H⁺]

[OH⁻] = 1.0 x 10¹⁴ / 10^(-pOH)

[OH⁻] = 1.0 x 10⁻¹⁴ / 10^(-9.7)

[OH⁻] ≈ 1.99 x 10⁻⁶ M

5. Being diprotic means that a molecule or ion can donate or release two protons (H⁺ ions) in an acid-base reaction.

6. Amphoteric refers to a substance that can act as both an acid and a base.

7. The pH can be measured using a pH meter or a pH indicator.

8. A buffer solution is a solution that can resist changes in pH when small amounts of acid or base are added to it.

9. Titration is a laboratory technique used to determine the concentration of a solution by reacting it with a solution of known concentration (titrant) of another substance.

10. A strong acid is an acid that completely ionizes in water, releasing all of its hydrogen ions. A weak acid is an acid that does not completely dissociate into ions when dissolved in water.

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Step 1

Charles' law states that the volume of an ideal gas is directly proportional to the absolute temperature at constant pressure.

Mathematically:

V1/T1 = V2/T2 (1)

V = volume in L

T = temperature in K

----------------

Step 2

Data provided:

V1 = 8.7 L

T1 = 29.0 °C + 273 = 302 K

-----

V2 = unknown

T2 = 133 °C + 273 = 406 K

----------------

Step 3

V2 is cleared from (1):

V1/T1 x T2 = V2 = 8.7 L/302 K x 406 K = 11.7 L approx.

Answer: V2 = 11.7 L

The difference between the energy needed to break the bonds in the reactants and the energy released when new bonds are created in the products is what essentially determines the enthalpy change.

In general, a bond must be broken by a positive change in enthalpy, whereas a bond must be formed by a negative change in enthalpy. In other words, the process of breaking a bond is endothermic, whereas the process of forming a bond is exothermic.

The energy needed to break the links between the reactants less the energy released during the formation of new bonds in the products is the enthalpy of reaction.

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In terms of bonds breaking and forming, what's responsible for the enthalpy change?

Answer:

B. equal numbers of molecules

Explanation:

To solve this problem, I'll need some additional information related to the molar mass of butane (C4H10). Please provide the molar mass of butane so that I can proceed with the calculations.

Answer:

the scrubby plants in the chaparral biome fix CO2 from the atmosphere through photosynthesis and store carbon as starch. The energy from these carbohydrates is passed on to animals and insects that consume the plants. These primary consumers will pass on the carbon’s energy to other animals that prey on them. When plants or animals die and decompose, the carbon in their bodies returns to the earth. Fossil fuels, which are made from ancient decomposed matter, release carbon back into the atmosphere as CO2 when they are burned

Answer:

\(\frac{1}{24}\)

Explanation:

Given:

For a school event, 1/6 of the athletic field is reserved for the fifth -grade classes and the reserved part of the field is divided equally among the 4 fifth grade classes in the school.

To find: fraction of the whole athletic field reserved for each fifth class

Solution:

Fraction of the whole athletic field reserved for four fifth classes = \(\frac{1}{6}\)

So, fraction of the whole athletic field reserved for each fifth class = \(\frac{1}{4}(\frac{1}{6})=\frac{1}{24}\)

True, when one bombarded beryllium with alpha particle , a carbon-12 nucleus was formed and a neutron was emitted.

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The mass of krypton tetrachloride that can be produced assuming 100% yield is mathematically given as

molar mass=33.29g

Generally, the equation for ideal gas is mathematically given as

PV=nRT

Therefore

n=(0.50)(15.)/0.082*623

n=0.147mol

Hence for clorine

n=0.441mol

Given the reaction

Kr+2cl2---->KrCL4

Hence

molar mass=225.60*0.147

molar mass=33.29g

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Answer: 19

Explanation:

2C6H14 + 19O2 —> 12CO2 + 14H2O

The answer is: The electronic configuration of Nitrogen is \(1s^22s^22p^3\).

Electronic configuration: The electronic configuration is defined as the distribution of electrons of an atom in the atomic or molecular orbitals and is written using the labels for the subshell.

How to decide which orbital is filled first?

(Shown in image)

         \(1s^22s^22p^3\)

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Nitrogen's complete electron configuration is 12s2s22p3.

The shorthand electron configuration for noble gases is [He] 2s22p3. Nitrogen has an atomic number of 7. The nitrogen atoms' nucleus contain this many protons. An atom that is neutral has an equal number of protons and electrons. Thus, the ground state electron configuration will consist of 7 electrons in the suitable s and p orbitals (state of lowest energy). For nitrogen, the entire electron configuration is 1s22s22p. Scientists may easily express and explain how the electrons are organized around the nitrogen atom's nucleus by using the configuration notation for nitrogen (N). As a result, it is simpler to comprehend and forecast how atoms will cooperate to form chemical bonds.

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Answer:

71g

Explanation:

i think thats right?

One mole of chlorine would be 71 g unless they said "1 mole of chlorine ATOMS".

The value of the constant R in L*atm/(mol*K) is approximately 0.082057 L*atm/(mol*K). The units are a little complex so it is easier for us to viasualize it as a fraction:

To get the constant value in terms of bar, that is, L*bar/(mol*K), we can use the convertion of atm-bar:

So, we have:

So, the value of the constant R is approximately 0.083144 L*bar / (mol*K).

To research some substances pH 0 to less than 7 is acidic, 7 is neutral and more than 7 is neutral.

baking soda - base

Vinegar - acid

Distilled water - neutral

Pure rain - neutral

Ammonia -  nasic

Lemon juice -  acid

Hair and skin - acidic

An acid is a molecule or ion capable of both donating a proton, referred to as a Brønsted–Lowry acid, or forming a covalent bond with an electron pair, known as a Lewis acid. the first class of acids are the proton donors, or Brønsted–Lowry acids.

An acid is any substance that in water answer tastes sour, adjusts blue litmus paper to red, reacts with a few metals to liberate hydrogen, reacts with bases to form salts, and promotes chemical reactions (acid catalysis). An acid is a substance that produces hydrogen (H+) ions when it's far delivered to water. A hydrogen ion is simply the proton and no electron

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A leather jacket and printer paper are examples of items that can be made from renewable resources, while plastic forks, metal cans, and electronics are not considered renewable due to their reliance on non-renewable materials and processes. Option  C, E

The two correct answers that are made from renewable resources are:

C) Leather jacket: Leather is derived from animal hides, which are a byproduct of the meat industry. As long as there is a sustainable and responsible approach to animal farming, the production of leather can be considered renewable. The hides are obtained from animals that are raised for meat consumption, and their use in leather production helps reduce waste.

E) Printer paper: Printer paper can be made from various sources, including trees, bamboo, and recycled paper fibers. If the paper is sourced from sustainably managed forests or from fast-growing plants like bamboo, it can be considered renewable. Additionally, the use of recycled paper fibers reduces the demand for materials and promotes a more circular economy.

The other options, A) plastic fork, B) metal can, and D) electronics, are not made from renewable resources:

A) Plastic fork: Plastics are typically derived from fossil fuels, which are non-renewable resources. The production of plastic involves the extraction and processing of petroleum or natural gas, both of which are finite resources.

B) Metal can: Metal cans are predominantly made from aluminum or steel. While these metals can be recycled, their initial production requires the extraction of raw materials from the Earth, which is not a renewable process.

D) Electronics: Electronics are made from a wide range of materials, including metals, plastics, and various chemical compounds. The production of electronics involves the extraction of raw materials, many of which are non-renewable resources.

Option C and E.

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Answer:

1. saturated

2. fatty acids

3. fatty acids

Explanation:

Answer:

option 2 is correct

Explanation:

Answer: 25.1195 L

Explanation:

Given:

There are 0.5860 mol of Iron powder (Fe)

The volume of oxygen gas at STP is 31.5 L

The volume filled by a gas at STP is approximately 22.71 L

Therefore, the moles of oxygen gas at STP = Volume of oxygen gas at STP/ 22.71

= 35.1/22.71

= 1.5456 mol

The balanced chemical equation given for this reaction is:

4Fe(s) + 3O2 (g) ----> 2Fe2O3 (s)

Dividing the above equation by 2, yields:

2Fe(s) + 3/2O2(g) -------> Fe2O3 (s)

From the equation we see:

2 moles of Fe reacts with 3/2 mole of O2 to give one mole of Fe2O3

Thus, let x moles of O2 react with 0.5860 moles of Fe

0.5860/2=x/3/2

0.5860*3=4*x

x = 1.758/4

x =0.4395 mol

So the remaining moles of oxygen gas = 1.5456 - 0.4395

= 1.1061 mol

Therefore, the amount of oxygen gas, in litres, remaining is = 1.1061*22.71

= 25.1195 L

Answer:

n = 3, l = 2, ml =-2

Explanation:

Quantum numbers are a set of values which can be used to describe the energy and position of an electron in space.

There are four sets of quantum numbers;

1) principal quantum number

2) orbital quantum number

3) spin quantum number

4) magnetic quantum number.

The values of orbital quantum number include; -l to +l;

The set of quantum numbers without error is ; n = 3, l = 2, ml =-2

Answer: The compound is \(Fe_2(SO_4)_3\)

Explanation:

Molar mass is defined as the mass in grams of 1 mole of a substance.

S.I Unit of Molar mass is gram per mole and it is represented as g/mol.

A. 1 mole of \(Al(NO_3)_3\) weighs = 26.98(1)+14.01(3)+15.99(9) =212.99 g/mol

B. 1 mole of \(C_3H_8\) weighs = 12.01(3)+1.007(8) = 44.1 g/mol

C. 1 mole of \(Fe_2(SO_4)_3\) weighs = 55.84(2)+32.06(3)+15.99(12) = 399.91 g/mol

D. 1 mole of \(CaCl_2\) weighs = 40.07(1)+35.5(2)= 110.98 g/mol

Thus the compound is \(Fe_2(SO_4)_3\)

The concentration of the hydrogen carbonate ion ([HCO₃⁻]) is approximately 3.15 x 10⁷ and the concentration of the carbonic acid ([H₂CO₃]) is approximately 2.52 x 10⁷.

The carbonate buffer system plays a crucial role in maintaining the pH balance of the extracellular environment. In this system, carbonic acid (H₂CO₃) and hydrogen carbonate (HCO₃⁻) act as a conjugate acid-base pair. Given that the ratio of carbonic acid to hydrogen carbonate is 1.25:1, we can assume that the initial concentration of carbonic acid is higher. Let's denote the initial concentration of carbonic acid as [H₂CO₃] and the concentration of hydrogen carbonate as [HCO₃⁻]. The dissociation of carbonic acid can be represented by the equation: H₂CO₃ ⇌ H⁺ + HCO₃⁻. The equilibrium constant (Ka) for this reaction is given as 4.5 x 10⁻⁷. At physiological pH (7.35), the concentration of H⁺ is determined by the dissociation of carbonic acid and is tightly regulated. To calculate the concentration of hydrogen carbonate ion ([HCO₃⁻]), we need to make use of the Henderson-Hasselbalch equation:

pH = pKa + log([HCO₃⁻]/[H₂CO₃])

Substituting the given values, we have:

7.35 = -log(4.5 x 10⁻⁷) + log([HCO₃⁻]/[H₂CO₃])

Rearranging the equation, we find:

log([HCO₃⁻]/[H₂CO₃]) = 7.35 + log(4.5 x 10⁻⁷)

Taking antilog of both sides, we get:

[HCO₃⁻]/[H₂CO₃] = 10^(7.35 + log(4.5 x 10⁻⁷))

Simplifying the right-hand side, we have:

[HCO₃⁻]/[H₂CO₃] ≈ 3.15 x 10⁷

Since the initial ratio of H₂CO₃ to HCO₃⁻ is 1.25:1, we can set up the equation:

[HCO₃⁻] = 1.25 x [H₂CO₃]

Substituting the value of [HCO₃⁻]/[H₂CO₃] from above, we find:

1.25 x [H₂CO₃] = 3.15 x 10⁷

Solving for [H₂CO₃], we get:

[H₂CO₃] ≈ 2.52 x 10⁷

Therefore, the concentration of the hydrogen carbonate ion ([HCO₃⁻]) is approximately 3.15 x 10⁷ and the concentration of the carbonic acid ([H₂CO₃]) is approximately 2.52 x 10⁷.

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Answer:

So we are given with the mass while we are asked for the amount of volume. So this means, we must need an information on the density. From literature, the density of human fat is 0.918 g/cm³. Convert grams to lb by the conversion that 1,000 g = 2.2 lbs.

Density = 0.918 g/cm³ * (2.2 lbs/1,000 g) = 0.0020196 lb/cm³

Volume = Mass/Density = 12.2 lb / 0.0020196 lb/cm³

Volume = 6,040.8 cm³