Xander claims that since the model of the atom has been changed so many times, that means it is a weak model. Willow claims that the more a model has been examined and adjusted, the stronger it is. Who is correct and why?

Answer:

20.(45)L or about 20.4545L

Explanation:

PV = nRT

Where:

P - pressure

V - volume

n - number of particle moles

R - a constant

T - temperature in K

We can assume the P and n (and definitely R) stay the same, so we infer that

\(V_1 = \frac{nRT_1}{P} = 15L\\V_2 = \frac{nRT_2}{P}\\V_1 / V_2 = \frac{nRT_1}{P} / \frac{nRT_2}{P} = \frac{T_1}{T_2}\\\\15L / V_2 = \frac{330K}{450K} = \frac{11}{15}\\\\V_2 = 15L \cdot \frac{15}{11} = 20.(45)L\)

Answer:

it's describes the velocity. since a direction was specifically given, that means it is displacement, and displacement is to velocity while distance is to speed

Answer:

since a direction was specifically given, that means it is displacement, and displacement is to velocity while distance is to speed

Explanation:

Answer:

carbon monoxide

I think its correct but I am not sure

Answer: when carbon is heated in air carbon dioxide is formed, so is incomplete combustion which results in carbon monoxide.

Explanation: but when carbon dioxide reacts with more oxygen carbon monoxide is formed i guess.

I AM A BIT SURE BUT HOPE THIS HELPSSSS!!!!

Answer:

see explanation

Explanation:

number of moles = mass ÷ relative formula mass

e.g.

Calculate the number of moles of carbon dioxide molecules in 22 g of CO2.

Ar (relative atomic mass) of C = 12, Ar of O = 16

Mr (relative formula mass) of carbon dioxide = 12 + 16 + 16 = 44

number of moles = 22 ÷ 44 = 0.5 mol

The percentage yield of bromoethane is 82.45%.

The percentage yield of a reaction can be calculated using the following formula:

Percentage Yield = (Actual Yield / Theoretical Yield) x 100

For this reaction, the theoretical yield of bromomethane is calculated by multiplying the moles of methanol by the moles of bromomethane and its molar mass.

Theoretical Yield = 5.00 g/32.04 g/mol x 1mol x 95g = 14.834 g bromomethane
where 95g is the molar mass of bromomethane.

The actual yield is given as 12.23 g, so the percentage yield is calculated as:

Percentage Yield = (12.23 g/14.834 g) x 100 = 82.45%

Therefore, the percentage yield of bromoethane in the reaction is 82.45%.

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Answer:

Answer: Neutral substance is a substance that shows no acid or base properties, has an equal number of hydrogen and hydroxyl ions and does not change the colour of litmus-paper. Water, sugar and table salt are common examples of neutral substances.

Acids found in kitchen are present in vinegar and in butter which can be identified their sour taste and bases present are baking soda and milk of magnesia and identified by their soapy touch.

Acids are defined as substances which on dissociation yield H+ ions , and these substances are sour in taste. Compounds  such as HCl, H₂SO₄ and HNO₃ are acids as they yield H+ ions on dissociation.

According to the number of H+ ions which are generated on dissociation acids are classified as mono-protic , di-protic ,tri-protic and polyprotic  acids  depending on the number of protons which are liberated on dissociation.

Acids are widely used in industries  for  production of fertilizers, detergents  batteries and dyes.They are used in chemical industries for production of chemical compounds like salts which are produced by neutralization reactions.

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Answer:

No it mostly likely would not because the first element(Neon) is already stable as it's outermost shell is completely filled

Explanation:

I'm not 100% sure about this because I know that some weird bonds do form in real life especially with the dative covalent

The amount of concentrated solution needed is (0.286 M)(65 mL) / C M, and the amount of water needed is 65 mL minus the volume of the concentrated solution.

To calculate the molarity of Kool Aid desired, we need to determine the number of moles of Kool Aid powder and sugar in the package. Since the molecular formula for sugar is C12H22O11, we can calculate its molar mass as follows:

Molar mass of C12H22O11 = (12 * 12.01) + (22 * 1.01) + (11 * 16.00)

= 144.12 + 22.22 + 176.00

= 342.34 g/mol

Given that the package contains 4.25 grams of Kool Aid powder, we can calculate the number of moles of Kool Aid powder using its molar mass:

Number of moles of Kool Aid powder = Mass / Molar mass

= 4.25 g / 342.34 g/mol

≈ 0.0124 mol

Similarly, for the sugar, which has a molar mass of 342.34 g/mol, we can calculate the number of moles of sugar using its mass:

Number of moles of sugar = Mass / Molar mass

= 192.00 g / 342.34 g/mol

≈ 0.5612 mol

Now, to calculate the molarity of the desired Kool Aid solution, we need to determine the volume of water. Given that 1.06 quarts is equal to 1 liter, and we have 2.00 quarts of water, we can convert it to liters as follows:

Volume of water = 2.00 quarts * (1.06 liters / 1 quart)

= 2.12 liters

To find the molarity, we use the formula:

Molarity (M) = Number of moles / Volume (in liters)

Molarity of Kool Aid desired = (0.0124 mol + 0.5612 mol) / 2.12 L

≈ 0.286 M

To prepare 65 mL of the desired molarity, we can use dilution calculations. We need to determine the volume of concentrated solution and the volume of water needed.

Let's assume the concentration of the concentrated Kool Aid solution is C M. Using the dilution formula:

(C1)(V1) = (C2)(V2)where C1 is the initial concentration, V1 is the initial volume, C2 is the final concentration, and V2 is the final volume.

Given that C1 = C M and V1 = V mL, and we want to prepare a final volume of 65 mL (V2 = 65 mL) with a final concentration of 0.286 M (C2 = 0.286 M), we can rearrange the formula to solve for the volume of the concentrated solution:

(C M)(V mL) = (0.286 M)(65 mL)

V mL = (0.286 M)(65 mL) / C M

So, the amount of concentrated solution needed is (0.286 M)(65 mL) / C M, and the amount of water needed is 65 mL minus the volume of the concentrated solution.

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The thalidomide catastrophe led to stricter rules for medication approval in numerous nations. Thalidomide is a racemic combination of the (R)- and (S)-enantiomers and exists in two mirror-image forms. The (S)-isomer is teratogenic, whereas the (R)-enantiomer has sedative properties.

Enantiomer theory enters the picture at this point. The thalidomide molecule can be found in two different forms in nature, (R)-thalidomide and (S)-thalidomide, which are enantiomers, or molecules that are mirror images of one another.

While the (S)-form is a teratogen, an agent that can result in birth abnormalities, the (R)-form possesses therapeutic qualities.

Therefore, It is extremely difficult and dangerous to isolate pure (R)- thalidomide because the two enantiomers of the drug regularly interconvert in the body to create a mixture that contains both enantiomers.

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Answer:

The answer is 7

Explanation:

Guessed it

Answer: Hydroelectricity, or hydroelectric power, is electricity produced from hydropower. In 2015, hydropower generated 16.6% of the world's total electricity and 70% of all renewable electricity, and was expected to increase by about 3.1% each year for the next 25 years

Explanation: An ecosystem is a community of living organisms in conjunction with the nonliving components of their environment, interacting as a system. These biotic and abiotic components are linked together through nutrient cycles and energy flows.

Answer:

hyd-  electricity produced from hydropower. in 2015, hydropower generated 16,6 % of the worlds total electricity and 70% of all renewable electricity, and was expected to increase by about 3.1% each year for the next 25 years.

Explanation:

eco- a biological community of interacting organism and their physical environment.

Explanation:

1. Measure your waste

It is easier to manage and track your improvement on something that is measured. Start by recording the types and quantities of waste materials generated within your business.

This could just be a quick visual assessment and estimation of amount and types of waste per week. As you change how you manage your waste, you can compare and see what difference your changes make to the amount of waste disposed to landfill.

2. Reduce

To reduce the amount of waste going to landfill, consider:

can waste be avoided or reduced by the way you procure goods and services or by changing your business operations?

does another local business have a use for the waste materials produced by your business?

what materials can be targeted for recycling?

3. Recycle

Find out what options are available locally for business recycling.

4. Collection services

It is a good idea to find out how levy fees will be managed by your waste service provider, and find out more about your waste collection services—how it impacts your ability to recycle and what options are available to you.

5. Separating waste

It’s important to ensure that waste is correctly separated for recycling. Putting the wrong waste in contaminates the recycling. Check out the free-to-download recycling signage to help businesses communicate correct recycling and waste separation behaviours.

Answer:

during the fermentation of glucose carbon dioxide and alcohol are produced

I hope this helps

Answer:

Explanation:

In order to find the volume be at 101.3 kPa we use Boyle's law which is

\(P_1V_1 = P_2V_2\)

where

P1 is the initial pressure

P2 is the final pressure

V1 is the initial volume

V2 is the final volume

Since we are finding the final volume

\(V_2 = \frac{P_1V_1}{P_2} \\ \)

From the question

P1 = 112 kPa = 112000 Pa

V1 = 259 cm³

P2 = 101.3 kPa = 101300 Pa

We have

\(V_2 = \frac{112000 \times 259}{101300} = \frac{29008000}{101300} \\ = 286.3573543...\)

We have the final answer as

Hope this helps you

The statement 'whether people should take medicine or if they should seek alternative treatments' describes an ethical dilemma that drug designers face.

Drug development refers to all the processes from target drug identification to drug validation and commercialization.

Drug development involves different stages of development including preclinical and clinical trials.

Ethical dilemmas in drug development include the release of a drug that is ineffective when compared to parallel treatments.

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Answer:

A drug for blood pressure is absorbed in the colon. It is effective, but occasionally it can erode the colon walls.

Explanation:

i just took the test and got it right.... i hope this helps :)

Answer:

Galileo: "Father of Modern Science."

Aristotle: Geocentric theory." (The planests revolves around the earth.)

Torricelli: Invented the barometer. (An instrument which measures pressure.)

Copernicus: Heliocentric theory. (Aka, the planets revolves around the sun.)

Vesalius: Examined the inner workings of the human body

Newton: Developed law of universal gravitation.

Nightingale: Founded nursing profession.

Celsius: Developed metric temperature scale

I hope this helps! Thanks:)

There are 3.98 × 10^23 atoms of oxygen in the sample.

Given that;

1 mole of Mo(NO3)6 contains 6.02 × 10^23 atoms of Nitrogen

x moles of Mo(NO3)6 contains 2.22 x 10^22 atoms of nitrogen

x = 1 mole × 2.22 x 10^22 atoms/6.02 × 10^23 atoms

x = 0.0368 moles

The number of oxygen atoms in the sample is given by; 0.0368 × 6.02 × 10^23 × 18

Therefore, there are 3.98 × 10^23 atoms of oxygen in the sample.

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The heat change of water is 5230 J.

To determine the heat transfer of the water,q, we use the heat transfer equation, which is expressed as:

q = m×c×ΔT

where,

m = 250.0 g which is the mass of water

c = 4.184 J/g°C which is the specific heat

ΔT = 25.00 - 20.0 = 5.0° c is the change in temperature

Now,

q = m×c×ΔT

  = 250.0 g × 4.184 J/g°C × 5.0°C

  = 5230 J

Hence, the heat change of water is 5230 J.

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Answer:

A liquid changes to gas

Explanation:

"Evaporation is the process by which water changes from a liquid to a gas or vapor. Evaporation is the primary pathway that water moves from the liquid state back into the water cycle as atmospheric water vapor."

Answer:

B

Explanation:

Giving the answer

The amount of heat gained by the water is 500 calories. Thus, option D is correct.

Given:

Mass of water (m) = 100 g

Change in temperature (ΔT) = 30°C - 25°C = 5°C

The specific heat capacity of water (c) is approximately 1 calorie/gram°C.

Now, the amount of heat gained by the water,

Q = mcΔT

Where:

Q is the heat gained or lost by the substance

m is the mass of the substance

c is the specific heat capacity of the substance

ΔT is the change in temperature

Plugging in the values into the formula:

Q = 100 × 1 × 5

Q = 500 calories

Therefore, the amount of heat gained by the water is 500 calories.

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Assuming the temperature and amount of gas are held constant, a plot of volume vs. pressure will result in a hyperbola. This is based on Boyle's law, which states that at a constant temperature, the volume of a gas is inversely proportional to its pressure.

Mathematically, this relationship can be expressed as PV=k, where P is the pressure, V is the volume, and k is a constant. Rearranging this equation, we get V=k/P, which shows that as pressure increases, volume decreases proportionally. However, this relationship is not linear, but rather a hyperbolic curve. This is because as the volume decreases, the remaining gas molecules occupy a smaller space, leading to more collisions and increased pressure. Thus, a hyperbolic curve results, with the volume decreasing more rapidly at higher pressures. Therefore, the correct answer to the question is c. hyperbola.

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Answer:

12 moles of CO

Explanation:

According to Avogadro, one mole of a substance, contains the same number of elementary entities as 12g of carbon-12. Now the number of elementary entities (atoms, molecules, ions, particles etc) in any substance is given by the Avogadro's constant.

Now since 1 mole of a substance contains Avogadro's number of atoms, it means that the substance with the highest number of moles will have the highest number of atoms.

With this in mind we can see that 12 moles of CO is expected to contain 72.24 ×10^23 atoms of CO. Hence the answer.

Answer:

c. 11 moles of N2O.

Explanation:

Hello,

In this case, for each substance, we use the Avogadro's number to compute the number of atoms in the given sample:

a.

\(atoms \ C=9molCO_2*\frac{1molC}{1molCO_2} *\frac{6.022x10^{23}atoms\ C}{1molC} =5.4x10^{24}atoms\ C\)

\(atoms \ O=9molCO_2*\frac{2molO}{1molCO_2} *\frac{6.022x10^{23}atoms\ O}{1molO} =1.1x10^{25}atoms\ O\)

\(Total\ atoms=1.1x10^{25}+5.4x10^{24}=1.64x10^{25}atoms\)

b.

\(atoms \ Xe=10molXe *\frac{6.022x10^{23}atoms\ Xe}{1molXe} =6.022x10^{24}atoms\)

c.

\(atoms \ N=11molN_2O*\frac{2molN}{1molN_2O} *\frac{6.022x10^{23}atoms\ N}{1molN} =1.3x10^{25}atoms\ N\)

\(atoms \ O=11molN_2O*\frac{1molO}{1molN_2O} *\frac{6.022x10^{23}atoms\ O}{1molO} =6.6x10^{24}atoms\ O\)

\(Total\ atoms=1.3x10^{25}+6.6x10^{24}=2.0x10^{25}atoms\)

d.

\(atoms \ C=12molCO_2*\frac{1molC}{1molCO_2} *\frac{6.022x10^{23}atoms\ C}{1molC} =7.2x10^{24}atoms\ C\)

\(atoms \ O=12molCO_2*\frac{1molO}{1molCO_2} *\frac{6.022x10^{23}atoms\ O}{1molO} =7.2x10^{24}atoms\ O\)

\(Total\ atoms=7.2x10^{24}+7.2x10^{24}=1.44x10^{25}atoms\)

Thus, we notice 11 moles of N2O have the greatest number of atoms.

Best regards.

Answer:

B

Explanation:

Because when you go to the doctors they say, "You need to get your x-rays done" not microwave

The concentration of a solution that is prepared by dissolving 15 mg of NaCl in 200 mL water is 75 ppm. So, the correct option is a.

To calculate the concentration in parts per million (ppm), we need to determine the amount of NaCl dissolved in the solution and then convert it to ppm.

Mass of NaCl = 15 mg

Volume of solution = 200 mL

First, we need to convert the volume from milliliters (mL) to liters (L):

Volume of solution = 200 mL = 200/1000 L = 0.2 L

Next, we can calculate the concentration of NaCl in mg/L:

Concentration (mg/L) = (mass of solute in mg) / (volume of solution in L)

Concentration (mg/L) = 15 mg / 0.2 L = 75 mg/L

Finally, we can convert the concentration from mg/L to ppm:

Concentration (ppm) = Concentration (mg/L) = 75 ppm

Therefore, the concentration of the NaCl solution is 75 ppm, which corresponds to option (a).

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Answer:

See explanation

Explanation:

An intrinsic property is a property that is internal, that is, it characterizes the substance under study. The possession of an intrinsic property depends on the nature of the substance. An intrinsic property does not depend on amount of substance but on the nature of the substance.

Examples of intrinsic properties include; Density. Solubility, Melting Point, Freezing Point, Boiling Point, Conductivity etc.

Intrinsic properties really represent the matter that is being studied. For instance, the boiling point of water will always be 100°c. No other liquid can boil exactly at that temperature. Hence, this intrinsic property can always be used to identify an unknown liquid as water.

The students were right, studying intrinsic properties accurately represent the matter that is being studied.

Answer:

C

Explanation:

Because i just had to do this on my assignment and got 100

Answer:

hey , its option c because in chemical reaction colour + evolution of gas takes place + temp. + precipitation. but also light can come in the case of chemical reaction.

If 100 mL of a gas at 27°C is cooled to -3°C at constant pressure, thus the new pressure of the gas comes out to be  89.94 cm³. The combined gas law, which connects the starting and end states of a gas under constant pressure, can be used to resolve this issue.

The combined gas law can be expressed as follows: P₁ * V₁/ T₁ equals P₂ * V₂ / T₂. Where: The initial and final pressures (assumed to be constant) are P₁ and P₂, respectively. The first volume is V₁.The initial temperature, T₁, is given in Kelvin.

The second volume is the one we're looking for, or V₂. The final temperature, T₂, is given in Kelvin.Let's use the information provided to solve for V₂: Volume at the start: V₁ = 100 mL = 100 cm³. Temperature at initialization: T₁= 27°C = 27 + 273.15 K = 300.15 K

T₂ = -3°C = -3 + 273.15 K = 270.15 K Final temperature. Inputting the values into the equation for the combined gas law: P₁ * V₁ / T₁ equals P₂ * V₂ / T₂. We can eliminate the pressure (P) because it is constant:(V₁ / T₁) = (V₂ / T₂)

To find V₂ by rearranging the equation: V₂ = (V₁ * T₂) / T₁, replacing the specified values: V₂ = (100 cm³ * 270.15 K) / 300.15 K. Calculating: V₂ ≈ 89.94 cm³. As a result, the gas's new volume will be roughly 89.94 cm3 when it is cooled from 100 mL at 27°C to -3°C at constant pressure.

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Answer:

Electromagnet

Explanation: