Plz Plz Plz help!!!!!
Which list of elements contains a metal, a metalloid, and a nonmetal?
1) Ag, Si, I2
2) Ge, As, Ne
3) K, Cu Br2
4) S, Ci2, Ar

Answer:

Chlorine (Cl)

Explanation:

1.ca

2.H

3.O

.................

The sample will degrade at a rate of 151.74 decays per minute in 1000 years and 10.24 decays per minute in 50000 years, respectively.

To calculate the decay rate of the carbon sample in Part A and Part B, we need to consider the half-life of carbon-14. The half-life of carbon-14 is approximately 5730 years.

Part A:

To find the decay rate of the sample in 1000 years, we need to determine the number of half-lives that have passed in 1000 years. We can do this by dividing the time elapsed (1000 years) by the half-life of carbon-14 (5730 years):

Number of half-lives = 1000 years / 5730 years ≈ 0.1748

Since each half-life halves the initial quantity, we can calculate the remaining fraction of the sample after 0.1748 half-lives:

Remaining fraction = (1/2)^(0.1748) ≈ 0.9391

The decay rate is given as 161.5 decays/minute, so we can calculate the decay rate of the sample in 1000 years:

Decay rate in 1000 years = Remaining fraction * Initial decay rate

= 0.9391 * 161.5 decays/minute

≈ 151.74 decays/minute

Therefore, the decay rate of the sample in 1000 years is approximately 151.74 decays/minute.

Part B:

To find the decay rate of the sample in 50000 years, we need to determine the number of half-lives that have passed in 50000 years:

Number of half-lives = 50000 years / 5730 years ≈ 8.7257

Using the same logic as in Part A, the remaining fraction after 8.7257 half-lives is:

Remaining fraction = (1/2)^(8.7257) ≈ 0.0632

Now we can calculate the decay rate in 50000 years:

Decay rate in 50000 years = Remaining fraction * Initial decay rate

= 0.0632 * 161.5 decays/minute

≈ 10.24 decays/minute

Therefore, the decay rate of the sample in 50000 years is approximately 10.24 decays/minute.

To know more about decay rate click on below link :

https://brainly.com/question/30068164#

#SPJ11

Answer:

Atomic number

Explanation:

Because atomic number is unique for each element and never changes

The power output of the turbine is 45.7 kW (approx).

The adiabatic turbine is operating with steam that has a flow rate of 1.2 kg/s, inlet pressure (Pi) of 3 MPa and inlet temperature (Ti) of 400°C.

After going through the adiabatic turbine, the pressure (P2) drops to 30 kPa.

The isentropic efficiency (ηi) of the turbine is 0.92.

We have to calculate the power output by the turbine.

Power output of the turbine can be calculated using the formula,

Power Output (W) = (m * h1 - m * h2) / ηi

Where, m = Mass flow rate of the steam

h1 = Enthalpy of steam at the inlet to the turbine

h2 = Enthalpy of steam at the outlet from the turbine

h1 is determined from the steam table at 3 MPa and 400°C.

Similarly, h2 is determined from the steam table at 30 kPa (P2).

h1 = 3249.9 kJ/kg (from steam table)

h2 = 2445.3 kJ/kg (from steam table)

Substitute these values in the formula,

Power Output (W) = (1.2 * 3249.9 - 1.2 * 2445.3) / 0.92

Power Output (W) = 45684.35 watts ≈ 45.7 kW

The power output of the turbine is 45.7 kW (approx).

To know more about turbine, visit:

https://brainly.com/question/31783293

#SPJ11

The power output of the turbine is `W = -127.92 kW` (negative sign indicates that work is done by the system).

Given,

Mass flow rate of water, `m = 1.2 kg/s`

Inlet conditions of water,

`P1 = 3 MPa` and

`T1 = 400°C`Exit pressure of water,

`P2 = 30 kPa`

Isentropic efficiency of the turbine,

`η = 0.92`

First, we need to determine the exit state of water using the given inlet and exit conditions.

The inlet state of water can be determined using the steam tables.

Using steam tables,

h1 = 3496.6 kJ/kg` (Enthalpy of saturated water at 3 MPa)

Using the same steam tables, the entropy of water at 3 MPa and 400°C is

`s1 = 6.8466 kJ/kgK`.At 30 kPa,

the entropy of water is

`s2s = 7.0305 kJ/kgK`.

The isentropic enthalpy of exit state can be determined using the inlet entropy and exit pressure.

`s2s = s1 = 6.8466 kJ/kgK`

`h2s = 249.5 kJ/kg` (enthalpy of water at 30 kPa and 400°C using steam tables).

Now, we can determine the actual exit state of water using the given isentropic efficiency.

`η = (h1 - h2)/(h1 - h2s)`

where,

`h2` = actual exit enthalpy of water.

Substituting the values,`0.92 = (3496.6 - h2)/(3496.6 - 249.5)

`Solving for `h2`, we get `h2 = 3600.8 kJ/kg

`The power output of the turbine is given by the expression:

Power output = Mass flow rate * (Enthalpy drop across the turbine)

W = m * (h1 - h2)`W = 1.2 kg/s * (3496.6 - 3600.8) kJ/kg

`Therefore, the power output of the turbine is `W = -127.92 kW` (negative sign indicates that work is done by the system).

To know more about Mass flow rate, visit:

https://brainly.com/question/30763861

#SPJ11

According to Maslow, humans devote all their efforts to satisfying lower-level needs until they are met. Only when these needs are met can people focus their attention on satisfying the next level of needs.

Maslow refers to Abraham Maslow, an influential psychologist known for his theory of human motivation and the hierarchy of needs. Maslow's hierarchy of needs is a psychological theory that explains human motivation and the progression of needs from basic survival to higher-level psychological fulfillment.

According to Maslow, human needs can be organized into a hierarchical structure, with lower-level needs needing to be satisfied before higher-level needs become motivating factors. The hierarchy consists of five levels:

Physiological Needs: These are the most basic needs necessary for survival, such as food, water, shelter, and sleep. These needs must be fulfilled before higher-level needs become relevant.

According to Maslow, humans devote all their efforts to satisfying lower-level needs until they are met. Only when these needs are met can people focus their attention on satisfying the next level of needs. These lower-level needs include physiological needs such as food, water, and shelter, as well as safety needs such as feeling secure and free from harm. Once these needs are satisfied, individuals can then focus on satisfying higher-level needs such as social belonging, self-esteem, and ultimately self-actualization.

To know more about devote visit:

https://brainly.com/question/11212628

#SPJ11

Answer:

No, because oxygen wants two electrons to become stable and lithium will only give up 1 electron.

The sample here is a compound. The correct option is c.

A chemical compound is a substance made up of many identical molecules that contain atoms from more than one chemical element and are held together by chemical bonds.

A molecule made up of only one element's atoms is thus not a compound.

The anode undergoes oxidation, while the cathode undergoes reduction. The species being oxidized provides the electrons.

An electrode in an electrochemical cell is referred to as an anode or a cathode depending on the direction of electron flow.

The electrode reacts with the electrolyte at the anode, producing electrons.

These electrons build up at the anode. Meanwhile, another chemical reaction occurs at the cathode, allowing that electrode to accept electrons.

Thus, the correct option is c.

For more details regarding compound, visit:

https://brainly.com/question/13516179

#SPJ2

The frequency of a red laser that has a wavelength of 676 nm would be 4.43 x \(10^{14\) hertz.

The frequency and wavelength of a wave are related by the following equation:

λf = c

Where λ is the wavelength of the wave in meters, f is the frequency in Hertz, and c is the speed of light in a vacuum.

in this case, λ = 676 nm = 6.76 x \(10^{-7\) m

c = 299,792,458 m/s

Making f the subject of the formula:

f = c/λ

  = 299,792,458/6.76 x \(10^{-7\)

  = 4.43 x \(10^{14\) hertz

In other words, the frequency of a red laser that has a wavelength of 676 nm would be 4.43 x \(10^{14\) hertz.

More on waves can be found here: https://brainly.com/question/29334933

#SPJ1

Answer:

A mixture of molecules is a group of molecules in which there are multiple different elements and atoms, that are in either fixed proportions or random. There are heterogeneous and homogenous mixtures.

Explanation:

After an organic reaction involving an aqueous solution, the organic solution might be washed with a saturated sodium chloride aqueous solution to reduce the amount of water in the organic solution.

Brine (saturated NaCl), the purpose of brine wash is to remove large amounts of water than may be dissolved in the organic layer. Washes can be considered to wash away impurities by moving the impurities into a different layer while the desired compound stays in its first layer.

Let us now see, how do you make brine? (for example)

It's simple soaking food in a salt water solution. Sometimes for extra flavor, you might add other ingredients, like sugar, herbs, or spices. But all you really need for a brine is salt and water, once the food that you're soaking absorb the brine, making the food more moist and fluffy, food loses its liquid during cooking, but since brined it starts out with more.

To learn more about Brine wash, head here

brainly.com/question/4762654

#SPJ4

Answer: A

Explanation:

i just took the quiz and it was right!

The scientist who proposed a model of the atom in which the individual atoms were thought of as tiny solids like balls or marbles is John Dalton.

Dalton's atomic theory, developed in the early 19th century, was based on the concept that atoms are indivisible and indestructible particles. He suggested that atoms combine to form compounds in fixed ratios and that chemical reactions involve the rearrangement of atoms.

Dalton's model of the atom as tiny solid spheres laid the foundation for our understanding of atomic structure. It was later refined by other scientists, such as J.J. Thomson and Ernest Rutherford, who discovered the existence of subatomic particles and the presence of a nucleus within the atom. Nonetheless, Dalton's model was significant in shaping our understanding of the atom as a fundamental building block of matter.

To know more about  atoms visit:-

https://brainly.com/question/1566330
#SPJ11

The number of seconds in a 40-hour work week can be  c. 40 h x

You work a regular 40-hour workweek (eight hours a day).

That persisted up until 1926, when Henry Ford let his workers off the hook for one day of obligatory labour. Eight-hour days and six-day weeks totaled 48 hours of labour each week for Ford employees. The 40-hour workweek, as it is currently known, was created by eliminating one day and replacing it with five days of eight-hour shifts.

Four nine-hour days followed by an eight-hour Friday is the most typical pattern for doing this. The next week consists of four nine-hour days and a Friday off.

A full-time employee is one who works an average of at least 30 hours per week for the duration of a calendar month in order to qualify under the employer shared responsibility laws.

learn more about  40-hour workweek refer

https://brainly.com/question/14241463

#SPJ4

Molar expansion accounts for the changes in the number of moles of a component within a reactor and can have a significant impact on the volume of a plug flow reactor, particularly in cases where the reactor volume is not constant.

(iii) "ei" is commonly used to represent the molar expansion term in chemical reaction engineering equations. It refers to the change in molar flow rate of a particular component i per unit time, per unit volume. The molar expansion term accounts for the variation in the number of moles of a component within a reactor due to chemical reactions or phase changes.

In a plug flow reactor, molar expansion can have different impacts on the reactor volume depending on the specific case. In part (i), where there is a constant volume, the molar expansion does not affect the reactor volume. The molar flow rates of reactants and products may change due to reactions, but the overall volume remains constant.

In part (ii), where the reactor is a semi-batch reactor with a varying volume, the molar expansion can significantly influence the volume of the reactor. As the reaction proceeds, the molar flow rates of reactants and products change, which can lead to changes in the total number of moles and, consequently, impact the reactor volume. The volume may increase or decrease depending on the molar expansion and the specific reaction taking place.

to learn more about Molar click here:

brainly.com/question/16587536

#SPJ11

The correct option among the following is (c) it includes the balanced chemical reaction and the change in enthalpy value is true of a thermochemical equation.

A thermochemical equation is a chemical equation that depicts the complete thermochemical reaction. It contains the balanced equation and a written interpretation of the net energy change.

The term "enthalpy of reaction" refers to the heat energy released or absorbed in a chemical reaction at a constant pressure.

Thermochemical equations are written in the same way as chemical equations, with the exception that they also include the change in enthalpy value (ΔH) for the reaction.

The change in enthalpy value reflects the energy absorbed or released by the reaction in the form of heat.

To know more about enthalpy, refer here:

https://brainly.com/question/13996238#

#SPJ11

Answer:

A. The largest value is 7 and the smallest value is 1. Find the difference. 7 - 1 = 6.

Explanation:

Answer:

Quito is the one..

The evaporation of water and dissolution of CO2 can affect the results of the experiment in several ways:

Concentration changes: As water evaporates, the concentration of the solute in the remaining solution increases. This can affect the rate of reaction, as the concentration of the reactants is a key factor in determining the rate. Similarly, as CO2 dissolves in the water, the concentration of dissolved CO2 increases, which can affect the pH of the solution.

Mass changes: As water evaporates, the mass of the solution decreases. This can affect the accuracy of the results, as the mass is often used to calculate the amount of product formed.

Temperature changes: Evaporation is an endothermic process, meaning that it requires energy in the form of heat. As a result, the temperature of the solution may decrease during the reaction, which can affect the rate of the reaction.

Overall, the effects of water evaporation and CO2 dissolution will depend on the specific conditions of the experiment, including the starting concentrations of the reactants and the rate of evaporation. In general, these factors can affect the accuracy and precision of the results, and must be carefully controlled or accounted for in order to obtain reliable data.

To know more about evaporation refer to-

https://brainly.com/question/5019199

#SPJ11

Answer:

To calculate the total volume of soil, we add the volume of solids plus the volume of water plus the volume of air

Explanation:

Answer:

Improvised health has been one of the main benefits of development. As humans, we need the primary aspects of life to keep us going. (food, water, oxygen) But scientificly we need health that will improve health. and Improved Health has been one of the main benefits of development. This benefit results partly from an increase in income and partly from scientific progress in the fight against disease and disability.

Answer:

m&ms, cus you can tell they're different but they can also be separated. salad because you can pick pieces of it out and it's made from different things, chocolate chip cookies cus you can take the chocolate chips out (or oatmeal raisin cookies)

Answer:

Distance cover = 8 km

Explanation:

Given:

Speed of runner = 4 km/h

Time taken = 2 hour

Find:

Distance cover

Computation:

Distance = Speed x Time

Distance cover = Speed of runner x Time taken

Distance cover = 4 x 2

Distance cover = 8 km

Character may try so hard to keep the work station clean but leave a single hair strand on the comb because they might not have noticed the hair strand. Alternatively, the hair strand may not have been visible due to its color or size, or it could have fallen on the comb after the main character finished cleaning.

It is possible that the main character takes pride in their work station and wants to maintain a clean and organized environment to provide the best service to their clients. However, it is also possible that they are simply forgetful or may not have noticed the hair strand. Hair strands can be difficult to spot, especially if they are of a similar color to the comb or if they are small in size.

Additionally, it is important to note that even though the main character left a single hair strand on the comb, it does not necessarily mean that their efforts to keep the work station clean were in vain. It is possible that they cleaned other areas thoroughly, but missed the hair strand accidentally.

To know more about hair strand visit:

https://brainly.com/question/11125292

#SPJ11

Answer:

strong nuclear force

Explanation:

1, a force that acts on charged particles

2, a force that holds atomic nuclei together

3, gravity, weak nuclear, electromagnetic, strong nuclear

4, strong nuclear force

5, Gravity and the electromagnetic force have infinite ranges while the nuclear forces have very small ranges.

100% :)

Answer:

310.53 g of Cu.

Explanation:

The balanced equation for the reaction is given below:

CuSO₄ + Zn —> ZnSO₄ + Cu

Next, we shall determine the mass of CuSO₄ that reacted and the mass Cu produced from the balanced equation. This can be obtained as follow:

Molar mass of CuSO₄ = 63.5 + 32 + (16×4)

= 63.5 + 32 + 64

= 159.5 g/mol

Mass of CuSO₄ from the balanced equation = 1 × 159.5 = 159.5 g

Molar mass of Cu = 63.5 g/mol

Mass of Cu from the balanced equation = 1 × 63.5 = 63.5 g

Summary:

From the balanced equation above,

159.5 g of CuSO₄ reacted to produce 63.5 g of Cu.

Finally, we shall determine the mass of Cu produced by the reaction of 780 g of CuSO₄. This can be obtained as follow:

From the balanced equation above,

159.5 g of CuSO₄ reacted to produce 63.5 g of Cu.

Therefore, 780 g of CuSO₄ will react to produce = (780 × 63.5)/159.5 = 310.53 g of Cu.

Thus, 310.53 g of Cu were obtained from the reaction.

By referring only to the periodic table, select the least electronegative element in the group is Al.

The ability of an atom to draw shared electrons in a covalent connection is referred to as electronegativity. The stronger an element attracts the shared electrons, the higher its degree of electronegativity.

Therefore, As we change position from boron to aluminum, the atomic size grows significantly. As a result, the nucleus's attraction to the electron weakens, which in turn lowers electronegativity.

Learn more about electronegative element  from

https://brainly.com/question/2596747
#SPJ1

Answer

ΔT = 3.78x10^-3 °C

Explanation

Given:

Energy (Q) = 12.0275 J

Mass of water = 760.6 g

We know the specific heat capacity of water = 4.182 J/g °C

Required: The change in temperature

Solution

Q = m x Cp x ΔT

ΔT = Q/m x Cp

ΔT = 12.0275 J/(760.0 g x 4.182 J/g °C)

ΔT = 3.78x10^-3 °C (or 0.00378 °C)

Since the exact values of the service times are not provided, it is not possible to calculate the 3-sigma control limits. Therefore, the correct answer is "None of the other options."

The 3-sigma control limits are used in statistical process control to determine the acceptable range of variation in a process. To calculate the 3-sigma control limits, we need to first find the mean and standard deviation of the service times for the 20 randomly selected customers.

Step 1: Find the mean (average) of the service times.
Add up all the service times and divide by the total number of customers (20).

Step 2: Find the standard deviation of the service times.
Calculate the difference between each service time and the mean, square each difference, sum up all the squared differences, divide by the total number of customers (20), and then take the square root of the result.

Step 3: Calculate the 3-sigma control limits.
Multiply the standard deviation by 3 and add/subtract the result to/from the mean. This will give you the upper and lower control limits.

Since the exact values of the service times are not provided, it is not possible to calculate the 3-sigma control limits. Therefore, the correct answer is "None of the other options."

Learn more about 3-sigma control limits from given link: https://brainly.com/question/17063477

#SPJ11