Which quantity in each of the following pairs is smaller?

a) 154 pm or 7.7 x 10^-9 cm

b) 1.86 x 10^11 μm or 2.02 x 10² km

c) 2.9 GA or 3.1 10^15 μA ​

Answer: 64.7 [tex]*10^2[/tex]

Explanation:

Significant figures are the number of digits in a value that correlate with the accuracy of that value.

First lets solve the equation:

(1.7x10^6)/(2.63x10^2) + 7.33 = ?

(1,700,000)/(263) + 7.33

(6,463.8783) + 7.33 = 6,471.2083

We have to simplify the answer to the correct amount of significant digits.

6,471.2083 -> 64.7 [tex]*10^2[/tex]

Answer:

In X2​O3​,. Percentage of oxygen by weight = 31.58. Percentage of X by weight = 68.42. Let the atomic weight of X = x. 2x+482x​×100 = 68.42. ∴ x = 51.99.

Explanation/solution in image

The mass in grams of water that are produced when 80. g of NaOH react with 73 g of HCl to form 117 g of NaCl and water is 36.0 g.

The equation of the reactions of sodium hydroxide and hydrochloric acid is given below:

NaOH + HCl ---> NaCl + H₂O

The mole ratio is 1 : 1 : 1 : 1

Moles of NaOH that reacted = 80/40

Moles of NaOH that reacted = 2 moles

Moles of HCl that reacted = 73/36.5

Moles of HCl that reacted = 2 moles

Moles of water produced will be 2 moles

Mass of water = 2 * 18 g/mol

Mass of water produced = 36.0 grams.

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Saturation concentration refers to the highest concentration of a substance that can exist in a solution in equilibrium with its solid or gaseous form. A saturation concentration less than 5 but greater than 2 is a relatively broad range, and many different chemicals could fall within this range depending on the conditions of the solution.

Examples of chemicals with saturation concentration less than 5 but greater than 2 include:

Calcium carbonate, which has a saturation concentration of around 3.5 g/L at room temperature and normal pressure

Iron(III) hydroxide, which has a saturation concentration of around 3.5 g/L at room temperature and normal pressure

Potassium chloride, which has a saturation concentration of around 3.5 g/L at room temperature and normal pressure

Ammonium chloride, which has a saturation concentration of around 2.5 g/L at room temperature and normal pressure

Sodium sulfate, which has a saturation concentration of around 3.5 g/L at room temperature and normal pressure

It's important to note that these are just examples, the saturation concentration of a chemical can vary depending on temperature, pressure, and other factors.

If 8.2 moles of Mg are burned, the number of moles of O₂ consumed is 4.1 moles.

Stoichiometry refers to the quantitative relationship between the reactants and products of a specific reaction or equation.

According to this question, magnesium reacts with oxygen to produce magnesium oxide as follows:

2Mg + O₂ → 2MgO

Based on the above equation, 2 moles of magnesium reacts with 1 mole of oxygen gas

This means that 8.2 moles of magnesium will react with 8.2 × ½ = 4.1 moles of oxygen gas.

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Answer:

A measure of an element's identity is determined by its atomic number, and its weight is determined by its atomic mass.

Explanation:

The amount of protons in the nucleus of an element's atom is known as the element's atomic number. It serves to identify and categorize the elements in the periodic table and is particular to each element. The chemical characteristics of an element are determined by its atomic number.

An element's atomic mass is its average atom's mass, which is typically expressed in atomic mass units (amu). It is the total number of protons and neutrons in the nucleus of an atom. The atomic mass can be a decimal and is not always a  number.

A measure of an element's identity is determined by its atomic number, and its weight is determined by its atomic mass.

Answer:

_4

Explanation:

according to how the ph scale is arranged ,you will notice that when tou move from ph 10 to ph 6 the form changes to negative and it will give the answer as _4

Answer:

The molar mass of an unknown gas can be determined using the concept of effusion. Effusion is the process of a gas passing through a small hole or porous partition. The rate of effusion of a gas is inversely proportional to the square root of its molar mass. This relationship is described by the Graham's law of effusion.

Explanation:

Graham's law of effusion states that the rate of effusion of a gas is inversely proportional to the square root of its molar mass.

R = k √M

Where R is the rate of effusion, k is a constant, and M is the molar mass of the gas.

If we know the rate of effusion of COCl2 and the rate of effusion of an unknown gas and we know that the unknown gas effuses at a rate 1.5 times the rate of COCl2.

R unknown = 1.5 * R COCl2

We can use this information to find the molar mass of the unknown gas.

M = (R COCl2 / (1.5 * R unknown) )²

If we know the molar mass of COCl2, we can substitute it in the equation and solve for the molar mass of the unknown gas.

It's worth noting that this problem requires you to know the molar mass of COCl2 which is not provided in the question. And also it's important to know that the values of the constant k in the equation for the different gases are not the same, so you need to use the same gas as reference.

We should be using natural materials because they are safer for our environment.

Claims: We should be using natural materials as opposed to synthetic materials. This is because natural materials are organic and 100% biodegradable. Synthetic materials, on the other hand, are not all naturally biodegradable. Many of them persist in the environment and hurt the environment and living organisms in the process.

Evidence: Most nylons and plastics are good examples of synthetic materials. Both are not biodegradable and persist in the environment. Our oceans are filled with nondegradable plastics. This plastic pollution is a threat to water transportation, aquatic biodiversity and food sustainability of humans.

Reasoning: Most synthetic materials affect the environment and we humans as compared to natural materials who are easily removed from the environment. Thus, our preference should be natural materials.

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The pressure of a gas is directly proportional to its temperature and inversely proportional to its volume.

PV/T = PV/T

(1.00atm * 3.5 L)/ 273k = (P * 0.50L)/(39.1 + 273k)
Do some simple algebra and you will get
P = 8.0 (Note that there should be 2 sigfigs)

Accidental cosmic background radiation, remarkably uniform, billions of years ago.

what is radiation ?

Radiation is a form of energy that is emitted in the form of waves or particles. It is an invisible form of energy that travels through space. Radiation is present everywhere in the environment and is emitted from many sources, both natural and man-made.

Natural sources of radiation include the sun, rocks, soil, and the air. Man-made sources include nuclear power plants, medical devices, and X-ray machines. There are several forms of radiation including alpha, beta, and gamma radiation. Alpha radiation is made up of particles, while beta and gamma radiation consists of electromagnetic waves. Different types of radiation have different properties that make them useful in various applications. For example, gamma radiation is used in medical imaging.

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Order from the weakest attraction to the strongest attraction is SrCl₂ > RbCl > YCl₃.

The London dispersion forces are the least powerful intermolecular forces. London's dispersion forces are also referred to as induced-dipole-induced-dipole because they are transiently attractive forces that cause temporary dipoles to form.

The non-polar, monatomic gas exhibits London dispersion.Ionic bonds > Hydrogen bonding > Van der Waals dipole-dipole interactions > Van der Waals dispersion forces.

The attraction of hydrogen bond is strongest, because they have permanent dipole-dipole forces, Van der Waal's forces is the weakest bond of attraction.

Thus, the order from the weakest attraction to the strongest attraction is SrCl₂ > RbCl > YCl₃.

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IUPAC named for the compound shown here is 1- hydroxyl, 3- ethyl, hexane.

The International Union of Pure and Applied Chemistry is full form of IUPAC. It is important because it creates a standardized way to name chemical compounds in organic chemistry.

The International Union of Pure and Applied Chemistry recommends using the IUPAC nomenclature of organic chemistry to name organic chemical substances.

The rule of the first point of difference states that the series that includes the lowest number when the first difference occurs is the "lowest."

Thus, IUPAC named for the compound shown here is 1- hydroxyl, 3- ethyl, hexane.

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The mass percentage of C is 7.8 %

The method for expressing a concentration is known as mass percent. The solution components of a given solution can be defined by the mass percentage.

The molar mass of CCL4 is carbon 12.0107g + 4*chlorine 35.453g = 153.823g.

The number of moles of carbon in CCL4 can be found by dividing the mass of carbon (12.0107g) by the molar mass of carbon (12.0107g/mol).

The mass percentage of carbon in CCL4 can be found by multiplying the number of moles of carbon by the molar mass of CCL4 and dividing by the total mass of CCL4, then multiplying by 100.

So, mass percentage of C = (12.0107g / 153.823g) * 100 = 7.8 %

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Answer:

Explanation:

5.342 x 10 the power of 7

The pressure on a cold winter day would be 16.03 psi.

The pressure law state that the pressure of a gas at constant volume is directly proportional to its temperature. This law can be mathematically expressed as follows:

[tex]P_1/T_1 = P_2/T_2[/tex]

Where [tex]P_1[/tex] = initial pressure of the gas, [tex]T_1[/tex] = initial temperature, [tex]P_2[/tex] = final pressure, and [tex]T_2[/tex] = final temperature.

In this case, [tex]P_1[/tex] = 33 psi, [tex]T_1[/tex] = 35 [tex]^oC[/tex] and [tex]T_2[/tex] = -17 [tex]^oC[/tex]. What we are looking for is [tex]P_2[/tex].

[tex]P_2[/tex] = [tex]P_1.T_2/T_1[/tex]

    = 33 x -17/35

     = 16.03 psi

In other words, at constant volume and without leakage, the pressure in the tire on a cold winter day when the temperature is -17 [tex]^oC[/tex] would be 16.03 psi.

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The molecular formula of the compound is C₂Cl₂.

The empirical formula of a chemical compound is the smallest ratio of elements present in the compound. From the analysis

Calculate the number of moles of the compound using the ideal gas equation P × V = n × R × T

P × V = n × R × T

1.10 × 0.01 = n × 0.0821 × 291.0

0.011 = n × 23.8911

n = 0.011 ÷ 23.8911

n = 4.6 × 10⁻⁴ mol

Calculate the molecular mass using Stoichiometry n = m ÷ M

M = m ÷ n

M = 0.04373 ÷ (4.6 × 10⁻⁴)

M = 95.0 g/mol

The molecular mass for the compound equals the molecular mass from the empirical formula times n.

M = M ((CCl)ₙ)

95.0 = (12 + 35.5) × n

95.0 = 47.5 × n

n = 95.0 ÷ 47.5

n = 2.1

n ≈ 2

The molecular formula times 2 from the empirical formula C₂Cl₂

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The Cr-incorporated Ni catalyst shows optimized OH-binding as well as H-binding energies for facilitating water dissociation and improving HER activity in alkaline media.

Developing efficient and inexpensive electro catalysts for the hydrogen evolution reaction (HER) in alkaline water electrolysis plays a key role in renewable hydrogen energy technology.

The trends in HER activity with respect to the binding energies of Ni-based thin film catalysts by incorporating a series of oxophilic transition metal atoms. It was found that the doping of oxophilic atoms enables the modulation of binding abilities of hydrogen and hydroxyl ions on the Ni surfaces, leading to the first establishment of a volcano relation between OH-binding energies and alkaline HER activities.

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The beaker of orthoxylene was put inside a sealed tank containing orthoxylene gas at 142. degree C and 893. torr will have the same amount of liquid inside it after ten minutes because the system is a closed system as none of the liquid's vapor escapes.

The correct option is the same amount.

A closed system allows energy to enter and exit but not matter to enter or exit. About a closed system is a covered pot on the burner. Both matter and energy cannot enter or leave an isolated system. A thermos or cooler is about as isolated a system as there is.

The beaker of orthoxylene that was put inside a sealed tank containing orthoxylene gas at 142 degrees C and 893 torr is a closed system.

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Answer:

Explanation:

1. Identify the elements present in the compound. The compound N2O3 contains two elements: nitrogen (N) and oxygen (O).

2. Determine the type of compound. N2O3 is an ionic compound, as it contains two different elements.

3. Write out the full name of the compound. The full name of the compound is dinitrogen trioxide.

4. Identify the subscripts. The subscripts indicate the number of atoms of each element in the compound. In this case, there are two nitrogen atoms (N2) and three oxygen atoms (O3).

5. Assign the proper name. The proper name for N2O3 is dinitrogen trioxide.

Explanation:

The volume of O2 at 988 is 0.1634°C

Answer:In (a). 1st blank will be 1

2nd blank will be 4

3rd blank will be 3

(b).1-1

2-3

3-1

4-2

(c).1-1

2-12

3-12

4-11

(d).1-2

2-3

3-2

4-4

Explanation:

Answer:

the density of 10.002 g of water at 20°C in the units of g/mL is 0.998 g/mL

Explanation:

Density of 10.002g of water at 20°C in g/mL = 0.998 g/mL

Given that:

density of water at 20°C = 0.9982 g/mL

Density = mass / volume ---- ( 1 )

Where :  mass = 10.002 g

              Volume = ?

              Density = 0.9982 g/mL

∴ Volume = 10.002 / 0.9982   = 10.02 mL

back to equation ( 1 )

Density = 10.002 / 10.02 = 0.9982 g/mL ≈ 0.998 g/mL

The statements about substances X and Y are true are Y is the solvent in this solution, The presence of Y in the solution lowers the vapor pressure of X and if Y were not present, there would be more X particles in the gas above the liquid solution. Therefore, option A, B and C are correct.

A mixture in which one substance dissolves in the other is called a solution. The solute is the substance that dissolves. The solvent is the substance that does not dissolve. Salt water is an example of a solution.

In a mixture called a solution, every component is well combined. Solutions can contain solids, liquids, and gases and are regarded as homogenous mixes. A solute and a solvent makeup a solution. Any substance that dissolves in a solvent is referred to as a solute.

Thus, option A, B and C are correct.

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Answer:

11000

Explanation:

85.3 has 3 significant figures

21.489 has 5 significant figures

0.0059 has 2 significant figures ( as zeros on the left are not significant)

The answer is always rounded off to the least number of decimal places given in the question. Here the least number is two significant figures.

Therefore;

(85.3 - 21.489)/0.0059

= (63.811)/0.0059

= 10815.42

As we have to round off the answer to two significant figures:

= 11000

Answer:

isolation, loneliness or psychological distress

Explanation:

In addition, older people are more likely to experience events such as bereavement, or a drop in socioeconomic status with retirement. Sadly these stressors can result in isolation, loneliness or psychological distress in older people. Mental health has an impact on physical health and vice versa.

Two moles or 78 g of potassium metal reacts with water to give one mole or 2 grams of hydrogen gas. Then 20 g of K will give 0.51 g of hydrogen gas.

Metals especially alkali metals and alkaline earth metals are highly reactive towards air and water. By reacting with water these metals produces their corresponding hydroxides.

Potassium reacts with water forms KOH as written below:

[tex]\rm 2K + 2H_{2}O \rightarrow 2 KOH + H_{2}[/tex]

As per this reaction, 2 moles of K produces 1 mole of hydrogen

atomic mass of K = 39 g/mol

mass of 2 K = 78 g

mass of H₂ = 2g

Then mass of H₂ produced from 20 g of K is:

mass of H₂ = (20 × 2) /78 = 0.51 g

Therefore, 0.51 g of hydrogen gas is produced by 20 grams of potassium metal.

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The mole fraction of oxygen in the cylinder, given that the cylinder contains 8.2 moles of oxygen and 8.22 moles of lead is 0.499

Mole fraction is simply defined as:

Mole fraction of subtance = Mole of sunstance / total mole

Next, we shall determine the total mole in the cylinder. Details below:

Total mole = Mole of oxygen + mole of lead

Total mole = 8.2 + 8.22

Total mole = 16.42 moles

Finally, we shall determine the mole fraction of oxygen in the cylinder. Details below:

Mole fraction of oxygen = mole of oxygen / Total mole

Mole fraction of oxygen = 8.2 / 16.42

Mole fraction of oxygen = 0.499

Thus, we can conclude from the calcultions made above that the mole fraction of oxygen is 0.499

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Complete question:

A cylinder contains 8.2 mol of oxygen and 8.22 mol of lead. What is the mole fraction of oxygen in the cylinder?

The vapor pressure at 85.0°C of a solution prepared by dissolving 0.300 mol of liquid dibromoethane the vapor pressure at 85.0°C of a solution prepared by dissolving 0.300 mol of liquid dibromoethane is 164.83 torr.

The term vapor pressure is defined as the tendency of a material to change into the vapour state, and it increases with temperature.

For calculating mole fraction of C₂H₄Br₂ as follows

X C₂H₄Br₂ = moles of C₂H₄Br₂ / moles of C₂H₄Br₂ + moles of C₃H₆Br₂

= 0.3 / 0.3 + 1.80

= 0.14

For calculating mole fraction of C₃H₆Br₂ as follows:

XC₃H₆Br₂ =  moles of C₃H₆Br₂ / moles of C₂H₄Br₂ + moles of C₃H₆Br₂

= 1.80 / 2.1

= 0.85

For calculating total vapor pressure as follows:

P total = [ ( 0.14 × 127) + (0.85 × 173) ]

= 17.78 + 147.05

= 164.83 torr

Thus, The vapor pressure at 85.0°C of a solution prepared by dissolving 0.300 mol of liquid dibromoethane the vapor pressure at 85.0°C of a solution prepared by dissolving 0.300 mol of liquid dibromoethane is 164.83 torr.

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The wavelength  you get for an angle of incidence of 30 degrees and reflection angle of 7 degrees is

2.3633166* 10^{-4}mm

Generally, To calculate the wavelength, you would need to use the equation for diffraction grating:

mλ = d(sin θi - sin θr)

Where

Plugging in the given values:

1λ = (1/1600 mm)(sin 30° - sin 7°)

Solving for λ:

λ = (1/1600 mm)(sin 30° - sin 7°)

λ = 2.3633166* 10^{-4}mm

This equation gives you the wavelength in the first-order diffraction

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