a photon with energy 2.92 ev is absorbed by a hydrogen atom. (a) find the minimum n for a hydrogen atom that can be ionized by such a photon. 3 correct: your answer is correct. (b) find the speed of the electron released from the state in part (a) when it is far from the nucleus. incorrect: your answer is incorrect.

From the calculations and the principles of radioactivity, the age of the parent isotope is 144 years

The term radioactivity has to do with the spontaneous decay of a substance.

We know that we have about 25% parent isotope still remaining hence;

\(0.693/t1/2 =2.303/t log No/N\\When N =0.25 No and t1/2 = 72 years\\0.693/72 =2.303/t log No/0.25No\\0.0096 = 2.303/t *0.60206\\0.0096 = 1.3865/t\\t = 1.3865/0.0096\\t =144 years\)

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Answer:

A. 144 years old

Explanation:

Answer:

7.8 g/cm³

Explanation:

The density of an object can be defined as the object's mass divided by its volume:

We are given both the mass and volume by the problem, so we compute the data in the equation:

This means the density of the object is 7.8 g/cm³.

The pots and other articles made from clay hardened by heat is called ceramics..

HOPE IT'S HELPFUL FOR U MATE!!!!

Answer:

105m

Explanation:

u=20m/s

g=10m/s^2

t=3s

s=ut+1/2gt^2at

s=20*3+1/2*10*3*3

s=105m

The number of phases that exist in equilibrium in a system depends upon the variables like temperature, pressure and composition. Here at 1 atm pressure water is in solid phase. The correct option is D.

The phase equilibria studies are made simpler by the use of plots which show how the various equilibria depend on the temperature, pressure and composition variables. These diagrams are called phase diagrams.

Here the pressure 1 atm on y-axis coincides with the temperature -5°C on x-axis. The water system is a one component system. So the water is in solid phase.

Thus the correct option is D.

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Answer:

1.1 for 3d, 0.76 for 16d.

Explanation:

You divide the mass of one nail by the nail size.... I think

To deploy configuration profiles for computers from Jamf Pro, the Apple Push Notification service (APNs) must be available.

APNs is a cloud-based service provided by Apple that enables the secure transfer of data between Apple devices and servers. It is essential for communication between Jamf Pro and Apple devices during the deployment of configuration profiles.

APNs is used to initiate the connection between the devices and Jamf Pro, allowing for the transfer of the configuration profiles. Without APNs, it would be impossible to deploy configuration profiles to Apple devices using Jamf Pro.

Therefore, it is critical to ensure that APNs is available and functioning correctly before attempting to deploy configuration profiles using Jamf Pro.

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Answer:

People may seem and act normally during the fugue, or they may appear moderately bewildered and draw no notice. When the fugue is over, however, people are thrown into a new scenario with no recall of how they got there or what they were doing.

Explanation:

Answer:

the process of carrying light

When electricity is passed through sodium sulfate solution, it separates the water molecules. Oxygen gas is produced at one electrode called the anode. At the other electrode called the cathode, hydrogen gas is produced. So, during electrolysis, oxygen gas is made at the anode and hydrogen gas is made at the cathode.

Answer:

The answer to this question is integumentary.

Explanation:

The answer is that because that is your skin area and so if you have a rash then if will affect that part.

It's b. integumentary

I got the test right

Carbon dioxide and particulates are emitted by volcanoes. Particulates form stratospheric aerosols that reflect sunlight The impact of atmospheric carbon dioxide and stratospheric aerosols can be briefly described below.

Carbon dioxide (CO₂): Carbon dioxide is a greenhouse gas that contributes to the greenhouse effect and global warming. It is released into the atmosphere through various human activities, such as the burning of fossil fuels and deforestation. The increasing concentration of CO₂ in the atmosphere is a significant driver of climate change.

Stratospheric aerosols: Stratospheric aerosols, formed by the release of particulates from volcanic eruptions or human activities, can have a cooling effect on the Earth's climate. These aerosols reflect sunlight back into space, reducing the amount of solar radiation that reaches the Earth's surface. As a result, they can temporarily offset some of the warming caused by greenhouse gases like CO2.

It's important to note that while stratospheric aerosols can have a cooling effect, they are relatively short-lived in the atmosphere compared to CO₂. Carbon dioxide, on the other hand, has a long residence time and accumulates over time, leading to long-term warming.

Therefore, the overall impact of increasing atmospheric CO₂ concentrations outweighs the cooling effect of stratospheric aerosols.

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H2O is covalent so A is false.

Water is in clouds so B is false.

Water is polar so C is false.

D is correct H2O has an imbalance of e- so it is polar. \(+H-O(-)-H+\)

An unusual property of water is a polar molecule. Therefore, option D is correct.

When two atoms form a covalent bond but do not share their electrons equally, polar molecules are created. A dipole is created when a portion of the molecule has a slight positive charge and a slight negative charge.

Because the electrons of the hydrogen atoms are "drawn" toward the electrons of the oxygen atom, water (H2O) is a polar molecule. As a result, the hydrogen atoms have a positive charge, whereas the opposite end of the molecule has a negative charge.

Polarity is one of the special characteristics of water because it is composed of polar molecules. Each water molecule has one oxygen atom and two hydrogen atoms (H2O). Polar covalent bonds are created by these compounds. The atoms of hydrogen are positively charged.

Thus, option D is correct.

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Answer:

mushroom

mold

spore cases

hyphae

fungus

The term used to denote the concentration of electrolytes in a given volume is "molarity".

Molarity-

Molarity is the number of moles of solute dissolved in one liter of the solution. Molarity is the most widely used concentration metric in chemistry, and it is frequently denoted by "M." It denotes the amount of solute in moles per liter of solution.

A solution's molarity can be calculated using the following formula:

Molarity = moles of solute / liters of solution

Molarity is often used to express the concentration of a solution's electrolytes because electrolytes break into ions when dissolved in a solvent, allowing for electrical conductivity.

Molarity can be used in other applications, such as stoichiometry, which involves determining how much of one compound is required to react completely with another.

Molarity is a useful tool for solving problems that involve chemical reactions since the number of moles of a substance is frequently used to establish reaction ratios, limit reactants, and determine the theoretical yield.

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Answer:

D

Explanation:

its just right

Answer:Reactants combine to form Products. Hope this helped! ;)

Explanation:

Answer:

The answer in this question is show you made Sodium Hydroxide and Hydrogen Gas.In order to do the products of the reaction relate to the phenol red test and the splint test you need to show that you made Sodium Hydroxide and Hydrogen Gas. Show that you made Sodium Hydroxide and Hydrogen Gas so that the products of the reaction relate to the phenol red test and the splint test.

The identity of element E in the nuclear reaction 238/92U → 234/90E + 4/2He is thorium (Th). The main ans for balancing nuclear reactions is to ensure that the total mass and atomic numbers are conserved on both sides of the reaction.

In this case, the total mass on the left side (238) is equal to the sum of the masses on the right side (234 + 4). Similarly, the total atomic number on the left side (92) is equal to the sum of the atomic numbers on the right side (90 + 2). Therefore, the only element that satisfies these conditions and has an atomic number of 90 is thorium (Th). This explanation confirms that the identity of element E in the nuclear reaction is thorium (Th).

In the nuclear reaction 238/92U → 234/90E + 4/2He, the identity of element E is Thorium (Th). To find the identity of element E, you need to look at the atomic number provided (90). Element 90 on the periodic table is Thorium (Th). In this reaction, Uranium (238/92U) decays into Thorium (234/90Th) and an alpha particle (4/2He).

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A possible mistake the student might have made is not using a proper solvent system for their sample on the TLC plate. If the sample components are too polar or nonpolar compared to the solvent, they might not move effectively on the plate, making it difficult to observe under UV light.

Additionally, the student could have applied too little sample, causing the spots to be too faint to see under UV light. It is important for the student to optimize the solvent system and sample application to achieve proper separation and visualization of components on the TLC plate under UV light. The wavelength of UV light, also known as ultraviolet light, is shorter than that of visible light but longer than that of X-rays. According to its wavelength, UV light may be classified as UV-A (320–400 nm), UV-B (280–320 nm), and UV-C (200–280 nm). The least dangerous UV-A radiation causes tanning and skin ageing. Sunburn is brought on by UV-B, which, when exposed in excess, can also result in skin cancer.

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Answer:Melting can create steam, kind of like a nukeular plant exept no nukulear rods

Answer:

a. 0.0105

b. 1.570

c. 0.00000354

d. 35,000,000

e. 1200

f. 0.000358

g. 548.6

The complete conversion of the given examples are as follows:

a. 10.5g =  0.00105  kg

b. 1.57 km = 1570 m

c. 3.54 ug = 3.54 × 10⁻⁵ g

d. 3.5 mol = 3.5 × 10⁶ umol

e. 1.2 L = 1200 mL

f. 358 cm = 3.58 × 10⁻⁴ m³

g. 548.6 ml = 548.6 cm

Conversion is a multi-stage procedure, which requires a numerical factor to multiply or divide and the appropriate selection of a number of important digits.

Using the International System Units for Conversions Factors.

(a)

If 1 g = 0.001 kg

∴

10.5 g will be:

\(\mathsf{= \dfrac{10.5 \ g \times 0.0001 \ kg}{1 \ g}}\)

= 0.00105  kg

(b)

If 1 km = 1000 m

1.57 km will be:

\(\mathsf{= \dfrac{1.57 \ km \times 1000\ m}{1 \ km} }\)

= 1570 m

(c)

If 1 ug = 1 × 10⁻⁵ g

∴

3.54 ug will be:

\(\mathsf{= \dfrac{3.54 \mu g \times 1 \times 10^{-5} \ g }{1 \ \mu g}}\)

= 3.54 × 10⁻⁵ g

(d)

If 1 mol = 10⁶ umol

∴

3.5 mol will be:

\(\mathsf{= \dfrac{3.5 \ mol \times 10^6 \ u \ mol}{1 \ mol} }\)

= 3.5 × 10⁶ umol

(e)

If 1 L = 1000 mL

∴

1.2 L will be:

\(\mathsf{=\dfrac{1.2 \ L \times 1000 \ mL}{1 \ L}}}\)

= 1200 mL

(f)

If 1 cm = 0.000001 m³

∴

358 cm will be:

\(\mathsf{= \dfrac{358\ cm \times 0.000001 m^3}{1 \ cm}}\)

= 3.58 × 10⁻⁴ m³

(g)

If 1 mL = 1 cm

∴

548.6 mL will also be equivalent to 548.6 cm

Therefore, from the above explanation, we've seen how to convert from one unit to another.

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To calculate the volume of ethyl alcohol that evaporated, we need to know the volume of ethyl alcohol that was present initially, the volume of ethyl alcohol after the evaporation, and the molar mass of ethyl alcohol.

Let's assume that the initial volume of ethyl alcohol is V_0 mL and the final volume is V_f mL. The volume of ethyl alcohol that evaporated is then V_e = V_0 - V_f mL.

We can use the ideal gas law to relate the volume of a gas to the number of moles of the gas present. The ideal gas law is given by:

PV = nRT

where P is the pressure, V is the volume, n is the number of moles of gas, R is the ideal gas constant, and T is the temperature.

Since the volume of a gas is directly proportional to the number of moles of the gas, we can write:

V/n = k

where k is a proportionality constant.

If we know the value of k for a given gas at a particular temperature and pressure, we can use this relationship to calculate the number of moles of the gas present.

In this case, we are told that 1 mole of any gas at STP (standard temperature and pressure) occupies a volume of 22.4 L, which is equivalent to 22,400 mL. Therefore, the value of k for any gas at STP is 22,400 mL/mol.

We can use this value of k to calculate the number of moles of ethyl alcohol that evaporated:

n = V_e/(22,400 mL/mol)

Substituting in the known values for V_e and k, we can calculate the number of moles of ethyl alcohol that evaporated.

For example, if the initial volume of ethyl alcohol was 1,000 mL and the final volume was 900 mL, the volume of ethyl alcohol that evaporated would be V_e = 1,000 mL - 900 mL = 100 mL. The number of moles of ethyl alcohol that evaporated would be:

n = 100 mL/(22,400 mL/mol) = 0.0044 moles

I hope this helps! Let me know if you have any questions.

Potassium atom is weakly electronegative and would be more stable if it gave up a valence electron.

The propensity of an element to draw a pair of bonding electrons is measured by its electronegativity. The Pauling measure is most frequently employed. The number ranges from 4.0 for fluorine, the most electronegative element, to 0.7 for cesium and francium, the least electronegative elements.

What happens if two elements with equivalent electronegativity combine?

Think about the connection between elements A and B. Since both atoms have the same propensity to attract the bonding pair of electrons if they are equally electronegative, it will typically be located halfway between the two atoms.

Normally, A and B would have to be the same atom to form a connection like this. This kind of bond can be found in compounds like H2 or Cl2, for instance. It's essential to keep in mind that this is a typical image. Actually, the electrons are in a molecule orbital, where they are constantly revolving. The electrons in this type of connection are distributed equally between the two atoms, making it a "pure" covalent bond.

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Answer:

60 mph (miles per hour)

Explanation:

0.5 hours is 1/2 of an hour, so to get the number of miles for a whole hour you multiply the miles ran by 2.

30 times 2 is 60.

After calculation and analyzing the molar mass of the unknown protein is

103.92g/mol.

the formula for the molar mass is

Π = i x M x R x T

here,

Π = osmotic pressure

i = van't Hoff factor

M = molarity

R = constant

T =  temperature

therefore, staging the given values into the formula we get

2.45 = 1 x M x 62.3637

M = 0.000104mol/L

now the molar mass of the protein is

molar mass = mass/ moles

given

15.87 gm of protein in 10ml

then,

0.01587 g of protein in 10 ml

restructuring the formula concerning moles

moles = mass/molar mass

0.01587 / 0.000104

= 0.153 mol/L

hence, the molar mass of the unknown protein is

molar mass = 0.01587/0.153

molar mass = 103.92 g/mol

After calculation and analyzing the molar mass of the unknown protein is

103.92g/mol.

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