g a student used the water displacement method to obtain the density of silver. the experimental density of silver the student obtained is 9.9 g/cm3. the known value of the density of silver is 10.5 g/cm3. what is the percent error of the density of silver obtained by the student?

Answer:

A cell membrane. A cell structure that controls which substances can enter or leave the cell. (found in all cells) In cells with cell walls, the cell membrane is located just inside the cell wall. In other cells, the cell membrane forms the outside boundary that separates the cell from its environment.

Hope this helps!

Explanation and Answers:

If we compare the properties of the sample #4 with the sample #2 we will find that:

a) What two piece of evidence support her claim?:

- The color of sample #4 is silver, it is the same color as the color of aluminum.

- Sample #4 conducts the electricity, the same as aluminum.

b) What one piece of evidence refutes her claim?:

- The density of sample #4 is different from the density of aluminum.

c) Why does this evidence refute her claim?

Because the density is a property that is characteristic of each metal, if the sample #4 has a density different from aluminum it can't be aluminum.

Answer: the Aufbau principle.

Explanation:

Answer:

astronots there already up there so they might as well do it.

Answer:

C-14 is radioactive because it contains 6 protons and 8 neutrons instead of 6 and 6 found in ordinary carbon. This imbalance causes the atom to be radioactive.

Being radioactive causes the C-14 to decay. It decays using a process called beta decay.

Beta decay makes the atom of C-14 decay into an atom of 14N during which one of the neutrons in the carbon atom turns into a proton.

Explanation:

The two emissions scenarios that most closely represent the current trend in CO2 emissions are the Representative Concentration Pathway (RCP) 4.5 and RCP 6.0 scenarios. RCP 4.5 assumes moderate emission reduction efforts, while RCP 6.0 represents a higher emission trajectory, reflecting the current trend where emissions reductions are not keeping pace with necessary targets.

The Representative Concentration Pathways (RCPs) are scenarios used to assess the potential impacts of greenhouse gas emissions on the climate system. RCP 4.5 assumes a moderate emission reduction pathway, with emissions peaking around 2040 and declining gradually. On the other hand, RCP 6.0 represents a higher emission trajectory, with emissions peaking later and declining more slowly compared to RCP 4.5. This scenario aligns with the current trend of rising CO2 emissions, indicating that global efforts to reduce emissions have not been sufficient. The current trend is closer to RCP 6.0, highlighting the challenges of achieving widespread emission reductions in various sectors of the global economy.

Learn more about CO2 here ; brainly.com/question/11382755

#SPJ11

The volume of carbon dioxide produced at STP when 30.0 g of calcium carbonate is combined with 30.0 mL of 6.0 M HCl is 4.032 L.

To determine the volume of carbon dioxide produced at STP (standard temperature and pressure), we need to calculate the number of moles of carbon dioxide first using the stoichiometry of the balanced equation between calcium carbonate (CaCO3) and hydrochloric acid (HCl).

The balanced equation for the reaction is:

CaCO3 + 2HCl -> CO2 + H2O + CaCl2

1 mole of CaCO3 reacts with 2 moles of HCl to produce 1 mole of CO2.

Step 1: Calculate the number of moles of HCl used:

Volume of HCl = 30.0 ml

Molarity of HCl = 6.0 M

Moles of HCl = (Volume in liters) x (Molarity) = 0.030 L x 6.0 mol/L = 0.180 mol

Step 2: Use the stoichiometric ratio to determine the number of moles of CO2 produced.

From the balanced equation, we know that 1 mole of CaCO3 produces 1 mole of CO2.

Therefore, 0.180 mol of HCl will produce 0.180 mol of CO2.

Step 3: Calculate the volume of CO2 at STP.

1 mole of any ideal gas at STP occupies 22.4 L.

Therefore, 0.180 mol of CO2 will occupy (0.180 mol) x (22.4 L/mol) = 4.032 L.

Know more about carbon dioxide here:

https://brainly.com/question/3049557

#SPJ11

solvation

Explanation:

Gaseous solutes already have their constituent particles separated, but the concept of being surrounded by solvent particles still applies.)

Answer:

The "control" is a group that continues under normal conditions in an experiment.

Explanation:

The control group regulates the experiment and serves as a reference point for changing variables.

A 14-year-old adolescent girl, Alice, has been diagnosed with anorexia nervosa. In the assessment of Alice, the findings that are more commonly associated with anorexia nervosa are Dysmenorrhea, decreased body temperature, and Heat intolerance.

Dysmenorrhea: Anorexia nervosa can lead to hormonal imbalances and disruptions in the menstrual cycle, which can cause irregular or absent periods (amenorrhea) and sometimes dysmenorrhea (painful periods).

Decreased body temperature: Anorexia nervosa can lead to lower body weight and reduced body fat, which can result in a lower body temperature. This is a physiological response to conserve energy and maintain the body's functions.

Heat intolerance: Anorexia nervosa can affect the body's ability to regulate temperature properly, leading to increased sensitivity to heat or cold. Individuals with anorexia may feel more discomfort or intolerance in extreme temperatures.

Hence,  the findings that are more commonly associated with anorexia nervosa are explained above.

Learn more about anorexia nervosa here:

https://brainly.com/question/32013975

#SPj 4

Answer:

C.

Explanation:

Physicists main field of study is physics. This includes everything from force, matter, energy, and even time among other things. Therefore, from the questions provided the one that would most likely be studied by a physicist would be How can the forces on a space probe be controlled so it will land on Mars? This is because this question deals with forces acting on an object, regardless of what the object is Force is a huge part of physics and therefore studied by Physicists.

Since the half-life of Iridium-192 is 73.83 days, we need to calculate how many half-lives it would take for the sample to reach 1% of its original amount. it would take approximately 516.81 days .

In radioactive decay, the amount of a radioactive substance decreases by half during each half-life. To find the number of half-lives required for the sample to decay to 1% of its original amount, we can use the formula:

Number of half-lives = (log(1%)) / (log(1/2))

First, we convert 1% to its decimal form, which is 0.01. Taking the logarithm base 10 (log) of 0.01 gives us -2. Next, taking the logarithm base 10 (log) of 1/2 gives us -0.301.

Substituting these values into the formula, we find:

Number of half-lives = (-2) / (-0.301) ≈ 6.64

Since we cannot have a fraction of a half-life, we round up to the nearest whole number. Therefore, it would take approximately 7 half-lives for a sample of Iridium-192 to decay to 1% of its original amount.

To determine the number of days, we multiply the number of half-lives by the half-life duration:

Number of days = 7 half-lives * 73.83 days per half-life ≈ 516.81 days

Therefore, it would take approximately 516.81 days for a sample of Iridium-192 to decay to 1% of its original amount.

To know more about radioactive , click here-

brainly.com/question/25750315

#SPJ11

Answer:

D. beaker on edge

Explanation:

The molecular weight of gas X would be 23.36 g/mol.

According to Graham, the rate of effusion of gases is inversely proportional to the square root of their molecular weights.

Graham's law can be mathematically expressed as:

\(r_1/r_2\) = \(\sqrt{\frac{m_2}{m_1} }\)

Where \(r_1\) and \(r_2\) are rates of diffusion or effusion of gases 1 and 2, and \(m_1\) and \(m_2\) are their molecular weights respectively.

In this case, \(r_x\) = \(2.5r_{SF6}\) and the molecular weight of Sf6 is given as 146 g/mol. Thus:

2.5 = \(\sqrt{\frac{146}{m_x} }\)

6.25 = 146/\(m_x\)

\(m_x\) = 146/6.25

      = 23.36 g/mol

In other words, the molecular weight of gas X would be 23.36 g/mol.

More on Graham's law can be found here: https://brainly.com/question/12415336

#SPJ1

Answer:

geosphere.

Explanation:

It is earth. rocks are not in the air, living things, or water mostly.

Answer:  baseball after being hit by a bat planet in orbit around a starExplanation:

Crystallization of sugar in a syrup can be avoided by adding inverted sugar. Invert sugar is a mixture of glucose and fructose, produced from sucrose. It is produced by hydrolysis of sucrose by heating with water and an acid such as lemon juice, vinegar or cream of tartar.

By adding invert sugar to a syrup, it reduces the amount of sucrose present in the solution and promotes the formation of glucose and fructose. This causes the solution to become more saturated and the syrup less likely to crystallize. Invert sugar is often used in the production of confectionery, ice cream, and other sweets.Inverted sugar can also be used to improve the texture and quality of baked goods. It is often used in cake recipes to enhance the flavor and increase the shelf life. It can also be used as a substitute for honey or corn syrup in recipes that require a liquid sweetener.In conclusion, the addition of invert sugar helps to prevent crystallization of sugar in syrup. Invert sugar is a mixture of glucose and fructose produced from sucrose by hydrolysis.

To know more about Crystallization visit :

brainly.com/question/32130991

#SPJ11

The land that supplies water to a river system is called a watershed, while pollution from a single, identifiable source is known as point source pollution. On the other hand, pollution that is difficult to link to a specific origin is referred to as non-point source pollution.

a) The land that supplies water to a river system is called a watershed. It is an area of land where all the water that falls or flows into it drains to a common point, such as a river, lake, or ocean. Watersheds play a crucial role in maintaining the health and quality of water resources by regulating the flow of water and filtering out pollutants.

b) Pollution from a single, identifiable source is known as point source pollution. This type of pollution can be traced back to a specific location, such as a factory, sewage treatment plant, or oil spill. Point source pollution can be easier to identify, monitor, and regulate compared to other forms of pollution.

c) Pollution that is difficult to link to a particular origin is called non-point source pollution. This type of pollution is caused by the cumulative effect of numerous, often dispersed activities, making it challenging to pinpoint a single source. Non-point source pollution includes contaminants carried by runoff from urban areas, agricultural fields, and chemical factories. It poses a significant challenge in terms of management and mitigation due to its diffuse nature.

Learn more about chemical here:

https://brainly.com/question/29240183

#SPJ11

Answer:

Explanation:es porque las especies con nichos idénticos tienen las mismas necesidades, lo que significa que competirían exactamente por los mismos recursos.

The neutrons are sub atomic particles. The particles which are smaller in size than an atom is known as sub atomic particles. The isotope of beryllium with mass number 9, i.e., ⁹Be has 5 neutrons.

The isotopes are defined as the chemical elements which have the same atomic numbers but different mass numbers. In isotopes, the number of neutrons differ from the number of protons. The physical properties of the elements are different.

'Be' has 3 isotopes, they are ⁷Be, ⁹Be and ¹⁰Be. Among these isotopes, ⁹Be is found to have 5 neutrons and 4 protons or electrons.

Thus ⁹Be is the most common isotope with 5 neutrons.

To know more about isotopes, visit;

https://brainly.com/question/13662697

#SPJ1

The decay constant for the radioactive isotope in this problem is approximately 0.069\(h^-^1\).

The activity of a radioactive isotope is the rate at which it decays, and is measured in becquerels (Bq). The activity of a sample of radioactive material decreases over time as the number of radioactive nuclei in the sample decreases due to radioactive decay.

The rate of radioactive decay is described by the first-order rate law, which relates the rate of decay to the number of radioactive nuclei present in the sample. The rate constant (λ) for radioactive decay is a characteristic property of the isotope and is related to its half-life (t1/2) by the equation:

t1/2 = ln(2)/λ

where ln(2) is the natural logarithm of 2, which is approximately 0.693.

To find the decay constant for the radioactive isotope in the given problem, we can use the following equation:

A = A0 e^(-λt)

where A is the activity at time t, A0 is the initial activity, and t is the time elapsed since the initial measurement.

Substituting the given values into this equation, we get:

80.2 Bq = 114 Bq e^(-λ(3 h 50 min))

Converting the time elapsed to hours, we get:

t = 3.833 h

Substituting this value, we get:

80.2 Bq = 114 Bq e^(-λ(3.833 h))

Dividing both sides by 114 Bq, we get:

0.704 = e^(-λ(3.833 h))

Taking the natural logarithm of both sides, we get:

ln(0.704) = -λ(3.833 h)

Solving for λ, we get:

λ = -ln(0.704)/3.833 h

λ ≈ 0.069 h^-1

for more such questions on radioactive

https://brainly.com/question/18640165

#SPJ11

Answer:

All elements are neutral

Explanation:

The plum pudding model of the atom indicated that all elements are neutral. The model was proposed by J.J Thomson after he conducted his experiment on the gas discharge tube.

From the experiment he discovered electrons which he called cathode rays.

Therefore, he suggested the plum pudding model of the atom.

The model describes negatively charge sphere surrounded by positive charges to balance them.

Answer: neutralization reactions

If we mix equal amounts of an acid and a base then the two chemicals essentially cancel out each other and produce salt and water. Mixing equal amounts of a strong acid with strong base results in a neutral solution whose pH value remains 7 and this type of reactions are known as neutralization reactions

Explanation:

Hope this helped you! :D

Brainliest if possible.

And I also answered first! :D

When the change in system entropy contributes to an increase in reaction spontaneity, the sign of the Gibbs free energy change (ΔG) is negative.

The Gibbs free energy change is given by the equation ΔG = ΔH - TΔS, where ΔH is the change in enthalpy, T is the temperature, and ΔS is the change in entropy. For a reaction to be spontaneous, the Gibbs free energy change must be negative (ΔG < 0).

If the change in system entropy (ΔS) is positive, it means that the system has become more disordered or more random, which usually indicates an increase in the number of available states for the system. This increase in entropy tends to contribute to a decrease in the Gibbs free energy, making the reaction more spontaneous.

Therefore, when the change in system entropy contributes to an increase in reaction spontaneity, ΔS is positive, and the sign of ΔG is negative.

You can learn more about entropy at

https://brainly.com/question/6364271

#SPJ11

Answer:

D. 108g of water

Explanation:

16g CH4 produces 2(18)g of H20

1g CH4 produces \(\frac{36}{16}\)g of H2O

48g CH4 produces \(\frac{36}{16}\)×48

                                108g of H20

Answer:

D. 108g of water

Explanation:

Answer:

As the car starts to slide down the ramp, it is kinetic energy and when it's on the top of the ramp,  it is potential energy. We can see that the energy is now being transferred through the car and ramp.

Two possible sources of systematic (determinate) error in the experiment are; Incorrect calibration of volumetric glasswareIncorrect mass of NaCl

To calculate the concentration of NaCl in the resulting solution in mg/L NaCl, we can use the formula; Concentration (mg/L) = (Mass of solute ÷ Volume of solution in L) × 1000 g / 1 mg NaCl is present in the stock solution of 25 mL. So, the mass of NaCl in the solution would be;0.0842 g ÷ 25 mL = 0.00337 g/mL. Now, in the resulting solution, a 1.00 mL aliquot of the stock solution is transferred to a 50.00 mL volumetric flask and diluted to volume. Therefore, the volume of the resulting solution is 50.00 mL. We will substitute these values in the formula, Concentration (mg/L) = (0.00337 g/mL ÷ 50 mL) × 1000 g / 1 mg concentration (mg/L) = 67.4 mg/L. Therefore, the concentration of NaCl in the resulting solution in mg/L NaCl is 67.4 mg/L.7.  Concentration = 67.4 mg/LTolerance = 4.28 mg/LTotal concentration = 67.4 + 4.28 mg/L = 71.68 mg/LWe round off this value to one decimal place; Total concentration = 71.7 mg/LTherefore, the concentration of NaCl in the resulting solution using propagation of error through the calculation is 67.4+0.4 mg/L.8. Two possible sources of random (indeterminate) error in the experiment are; Errors in temperature measurement. Errors in measurement of water volume. Two possible sources of systematic (determinate) error in the experiment are; Incorrect calibration of volumetric glasswareIncorrect mass of NaCl.

Learn more about NaCl

https://brainly.com/question/32275922?

#SPJ11

Answer:

The following is the correct match:  

1. Luster refers to how the reflection of the light takes place from a mineral.  

2. Cleavage signifies a manner in which the dissociation of a mineral occurs at the time of stress.  

3. Streak helps in the identification of a true and natural color of a mineral.  

4. Color is the least reliable characteristic of determination.  

5. Hardness is determined with the application of the Mohs scale.  

Answer:

I am pretty sure Danny Duncan told me 69

Explanation:

niice