What will happen to a piece of stone if you place it in water?
A. The stone will sink in water.

B. The stone will float in water.

C. The stone will decay in water.

D. The stone will soften in water

Millerite has a relatively simple structure compared to other the nickel sulfide family, making it a good example for crystal lattice drawing.

Millerite is a mineral with a hexagonal crystal structure that belongs to the nickel sulfide family. The crystal lattice structure can be drawn by following these steps:Step 1: Draw a six-sided figure to represent the hexagonal crystal structure.Step 2: Draw parallel horizontal lines inside the six-sided figure, with the distance between them equal to the c-axis spacing.Step 3: Draw vertical lines that cross the horizontal lines at a 60-degree angle, forming a hexagonal lattice.Step 4: On each horizontal line, draw circles that represent the nickel sulfide ions, with the distance between them equal to the a-axis spacing.Step 5: Draw circles on the vertical lines that represent sulfur ions, with the distance between them equal to the c-axis spacing.Step 6: Connect the circles with lines to complete the crystal lattice structure of millerite.Some additional points that could be kept in mind are- The hexagonal prism is defined by the crystal lattice constants "a" and "c," which are the distances between the nickel sulfide ions in the hexagonal lattice.- The sulfur ions fill the interstitial sites between the nickel sulfide ions in the lattice.

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You can use the half-life of a substance to find the time when 3/4 of the substance has decomposed by using the formula t = (ln(N/N₀)/(-λ)), where t is the time, N is the amount of substance remaining, N₀ is the initial amount of substance, and λ is the decay constant.

To find the time when 3/4 of the substance has decomposed, you can plug in the values for N and N₀. For example, if you start with 100 grams of a substance and want to find the time when 25 grams are remaining (meaning 75 grams, or 3/4, have decomposed), you would plug in 25 for N and 100 for N₀.

You can then use the decay constant, λ, which is related to the half-life of the substance by the equation λ = ln(2)/t₁/₂, where t₁/₂ is the half-life. Once you have the value for λ, you can plug it into the equation t = (ln(N/N₀)/(-λ)) and solve for t to find the time when 3/4 of the substance has decomposed.

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By the use of the Boyle's law as we can see in the solution below, the pressure is  51.5 units.

Boyle's law is a principle in physics that describes the relationship between the pressure and volume of a gas at a constant temperature.

It states that the pressure of a gas is inversely proportional to its volume, meaning that if the volume of a gas is decreased, the pressure will increase proportionally, and if the volume is increased, the pressure will decrease proportionally.

Using the Boyles law;

P1V1 = P2V2

P2 = P1V1/V2

P2 = 12.8 * 40.2/10

P2 = 51.5

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The solution created by dissolving 10.0 g of sodium hydroxide in a solution with a final volume of 150.0 mL has a 1.67 M concentration of hydroxide ions.

Dilution is the process in question. M1V1 = M2V2, where M1 and V1 are the volume and molarity of the initial concentrated solution, respectively, and M2 and V2 are those of the final diluted solution. This equation can be used to compare concentrations and volumes before and after a dilution.

Calculate the number of moles of sodium hydroxide (NaOH) using its molar mass.

Molar mass of NaOH = 23.0 g/mol + 16.0 g/mol + 1.0 g/mol = 40.0 g/mol

Number of moles of NaOH = mass / molar mass = 10.0 g / 40.0 g/mol = 0.250 mol

Calculate the concentration of hydroxide ions (OH-) in moles per liter (M).

Since the final volume of the solution is 150.0 mL, we need to convert it to liters by dividing by 1000:

Final volume = 150.0 mL / 1000 = 0.150 L

Concentration of hydroxide ions = moles of NaOH / final volume

Concentration of OH- ions = 0.250 mol / 0.150 L = 1.67 M

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Answer:

C

Explanation:

plum- pudding atomic model is an atom that had a positively charged medium, or space, with negatively charged electrons inside the medium.

The correct answer is (A) A description of atoms being balls of positive charge with electrons scattered outside.

Option (A) is correct because the atom was a sphere of positive charge with negatively charged electrons scattered around the atom like plums in a pudding.

So , Rest  options that are B , C and D are incorrect.

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Answer:

Explanation:

given amount of salt at time t is A(t)

initial amount of salt =300 gm =0.3kg

=>A(0)=0.3

rate of salt inflow =5*0.4= 2 kg/min

rate of salt out flow =5*A/(200)=A/40

rate of change of salt at time t , dA/dt= rate of salt inflow- ratew of salt outflow

\(dA/dt=2-(A/40)\\\\dA=2dt-(A/40)dt\\\\dA+(A/40)dt=2dt\)

integrating factor

\(=e^{\int\limits (1/40) \, dt}\)

integrating factor \(=e^{(1/40)t}\)

multiply on both sides by  \(=e^{(1/40)t}\)

\(dAe^{(1/40)t}+(A/40)e^{(1/40)t} dt =2e^{(1/40)t}t\\\\(Ae^{(1/40)t})=2e^{(1/40)t}t\)

integrate on both sides

\(\int\limits(Ae^{(1/40)t})=\int\limits2e^{(1/40)t}dt\\\\(Ae^{(1/40)t})=2*40e^{(1/40)t}+C\\\\A=80+(C/e^{(1/40)t})\\\\A(0)=0.3\\\\0.3=80+(C/e^{(1/40)t}^*^0)\\\\0.3=80+(C/1)\\\\C=0.3-80\\\\C=-79.7\\\\A(t)=80-(79.7/e^{(1/40)t})\)

b)

after long period of time means t - > ∞

\({t \to \infty}\\\\ \lim_{t \to \infty} A_t \\\\ \lim_{t \to \infty} (80)-(79/{e^{(1/40)t}}\\\\=80-(0)\\\\=80\)

The Answer is LEAD ......................

The sodium-potassium pump would make a potassium solution injection lethal as chloride is a potassium salt, which increases the blood and cardiac awareness of potassium to forestall the heart via an odd heartbeat and for that reason purpose demise by means of cardiac arrest.

Potassium chloride is the drug that reasons loss of lifestyle in execution below contemporary-day deadly injection protocols and is used in capital punishment and euthanasia, till 2009, maximum states used a three-drug aggregate for lethal injections, an anesthetic (normally sodium thiopental, until pentobarbital emerge as added at the prevent of 2010), pancuronium bromide (a paralytic agent, additionally known as Pavulon), and potassium chloride (stops the coronary heart )

The sodium-potassium pump is a protein pump that's critically critical to the function of neurons. It permits stabilizing membrane functionality, and for that reason is important in developing the situations essential for the firing of motion potentials.

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A student measures the molar solubility of nickel(II) cyanide in a water solution to be 2. 00×10-8 M. The Ksp of nickel(II) cyanide is \(8 \times10^{-24}\)

The solubility product constant, Ksp, serves as the equilibrium constant for solids that dissolve in water. The level of solute dissolution in solution is what it stands for. The more soluble a material is, the higher its Ksp value.

The following equation may be used to get the solubility product constant (Ksp) for nickel(II) cyanide from the molar solubility:

\(Ni(CN)_2(s)\) ⇌ \(Ni_2+(aq) + 2CN^-(aq)\)

\(Ksp = [Ni_2^+][CN^-]^2\)

As per the given information,  

the molar solubility of nickel(II) cyanide is given as \(2.00\times 10^{-8}\)M, the concentrations of \(Ni_2^+\) and \(CN^-\) ions are also \(2.00 \times 10^{-8}\) M.

We have to find the Ksp of nickel(II) cyanide.

Hence, the Ksp can be calculated as:

Ksp = \((2.00\times10^{-8})(2.00\times10^{-8})^{2}\)

Ksp =\(8.00\times10^{-24}\)

Hence, the Ksp of nickel(II) cyanide is \(8.00\times10^{-24}\)

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The theoretical molality of the sodium chloride solution is 0.926 mol/kg.

Steps are:

1. Convert the mass of sodium chloride to moles.
The molar mass of sodium chloride (NaCl) is 58.44 g/mol.
moles of NaCl = (mass of NaCl) / (molar mass of NaCl)
moles of NaCl = 1.18 g / 58.44 g/mol = 0.0202 mol

2. Convert the volume of water to mass.
Assume that the density of water is 1 g/mL.
mass of water = (volume of water) × (density of water)
mass of water = 21.8 mL × 1 g/mL = 21.8 g

3. Convert the mass of water to kilograms.
mass of water in kg = mass of water in g / 1000
mass of water in kg = 21.8 g / 1000 = 0.0218 kg

4. Calculate the molality.
molality = moles of solute / mass of solvent (in kg)
molality = 0.0202 mol / 0.0218 kg = 0.926 mol/kg

The theoretical molality of the sodium chloride solution is 0.926 mol/kg.

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The function of Y would be to keep oxygen-rich blood and oxygen-poor blood separate. The last option is the correct one.

Y is the septum

The septum is a structure of the heart that separates the left atrium from the right atrium as well as the two ventricles.

Thus, the structure prevents oxygenated blood from mixing with deoxygenated blood.

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The balanced chemical equation is:

0.5C7H16 + O2 → 0.5CO2 + H2O

For balancing the chemical equation C7H16 + O2 → CO2 + H2O, we can use linear algebraic techniques. We need to determine the coefficients that balance the number of atoms on both sides of the equation.

Let's denote the coefficients for C7H16, O2, CO2, and H2O as a, b, c, and d, respectively.

The balanced chemical equation can be written as:

aC7H16 + bO2 → cCO2 + dH2O

To balance the carbon (C) atoms, we have:

7a = c (Equation 1)

To balance the hydrogen (H) atoms, we have:

16a = 2d (Equation 2)

To balance the oxygen (O) atoms, we have:

2b = 2c + d (Equation 3)

We have three equations (Equations 1, 2, and 3) and four unknowns (a, b, c, d). To solve this system of equations, we can write it in matrix form and find the solution using linear algebraic techniques.

The augmented matrix for the system of equations is:

[ 7 0 -1 0 | 0 ]

[ 0 0 0 -2 | 0 ]

[ 0 -2 2 -1 | 0 ]

By performing row operations to row-reduce the augmented matrix, we can obtain the solution:

[ 1 0 -0.5 0 ]

[ 0 1 -1 -0.5 ]

[ 0 0 0 0 ]

The solution to the system of equations is:

a = 0.5

b = 1

c = 0.5

d = 1

Putting the values of a,b,c, and d we get the balanced chemical equation as:

0.5C7H16 + O2 → 0.5CO2 + H2O

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Answer:

Repetition

Explanation:

In the world of science, experiments are regularly conducted to test out hypotheses. These experiments are however, not conducted by scientist once to derive a result. They are rather conducted multiple times (repeated) to ascertain the accuracy i.e not as a result of random occurrence. The experiments that undergo multiple trials are said to undergo REPETITION.

This is the case of the scientist in this question, who is conducting an experiment to test what temperature causes the fastest growth rate in sunflower plants. He conducted the experiment multiple times, making it an example of REPETITION.

N.B: Replication is when the experiment is re-conducted by another scientist to see if same result is derived.

The marginal density function of X and Y is 1 and thus they are probability density functions and the probability of the conditions in (c) and (d) is 0.2 and 0.8 respectively.

A probability is a number that expresses the likelihood or chance that a given event will occur. Probabilities can be stated as proportions ranging from 0 to 1, as well as percentages ranging from 0% to 100%.

A probability density function, also known as the density of a continuous random variable in probability theory, is a function whose value at each given sample in the sample space may be read as offering a relative likelihood that the random variable's value will be near to that sample. Probability density functions are statistical measures that are used to predict the outcome of a discrete value. The probability density function is nonnegative all the way through, and the area under the entire curve is equal to one.

a) The marginal density of X is

\(f_X (x) = \int\limits^x_0 {f_{X,Y} (x,y)} \, dx = \int\limits^x_0 {2} \, dx = 2x\)

If it is a pdf, then

\(\int\limits^1_0 {f_X(x)} \, dx = 1\)

\(\int\limits^1_0 {2x} \, dx = x^2 |_0^1 = 1\)

Since integral is 1, marginal density function of X is pdf.

b) The marginal density of Y is

\(f_Y (y) = \int\limits^y0 {f_{X,Y} (x,y)} \, dy = \int\limits^y_0 {2} \, dy = 2y\)

If it is a pdf, then

\(\int\limits^1_0 {f_Y(y)} \, dy = 1\)

\(\int\limits^1_0 {2y} \, dy = y^2 |_0^1 = 1\)

Since integral is 1, marginal density function of Y is pdf.

c)

       \(P (x < 0.2,y > 0.5) = \int\limits^1_{0.5}\int\limits^{0.2}_0 {f_{X,Y} (x,y) \, dx \, dy = \int\limits^1_{0.5}\int\limits^{0.2}_0 2dxdy\)

       \(= \int\limits^1_{0.5} [2x]_0^{0.2}dy = 0.4[y]_{0.5}^1 = 0.4 (1 - 0.5) = 0.2\)

d)

      \(P (x < 0.8,y > 0.5) = \int\limits^1_{0.5}\int\limits^{0.8}_0 {f_{X,Y} (x,y) \, dx \, dy = \int\limits^1_{0.5}\int\limits^{0.8}_0 2dxdy\)

      \(= \int\limits^1_{0.5} [2x]_0^{0.8}dy = 1.6[y]_{0.5}^1 = 1.6 (1 - 0.5) = 0.8\)

The complete question is:

A chemical system that results from a chemical reaction has two important components in a blend among others. The joint distribution that describes the proportion X and Y of these two components is given by f(x,y) = 2 for 0 < x < y < 1 and f(x,y) = 0 otherwise. (a) Find the marginal density function of X and verify if it is a pdf. (b) Find the marginal density function of Y and verify if it is a pdf. (c) Find the probability that the component proportions produce results X < 0.2, Y > 0.5. (d) Find the probability that the component proportions produce results X < 0.8, Y > 0.5.

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Answer:

0.694 cents per second

Explanation:

25x100=2500 cents per hour, 2500/60 = 41.67 per minute and 41.67/60=0.694 cents per second

Depending on the chemical, these longer-term health effects might include:

Answer:

The correct option is;

Cathode rays are deflected towards a positively charged rod

Explanation:

Cathode rays are  beam of electrons emitted from the cathode in a vacuum tube and moving towards the anode, due to the difference in the voltage between the electrodes

The discovery of the electrons was through the proof by Thomson that cathode rays were a negatively charged, previously unknown particle, which was to become known as the electron.

Answer:

Cathode rays are deflected towards a positively charged rod

Explanation:

i took the exam this is correct

The helicopter's velocity is 12.8 m/s

We can determine how quickly or slowly an object is traveling by using the phrases velocity and speed. We frequently encounter circumstances when we must determine which of two or more things is traveling quicker. If the two are traveling in the same direction on the same road, it is simple to determine which is quicker. It is challenging to identify who is moving the fastest when their motion is in the opposite direction. The idea of velocity is useful in these circumstances. Learn more about velocity in this article, including its definition, how it is measured, examples, and the distinction it makes from speed.

distance =352 meters

Time = 27.5 seconds

velocity =?

v= d/t

where;

V= velocity

D= distance

T=time

applying formula:-

v=352 /27.5

 =12.8 m/s

The helicopter's velocity is 12.8 m/s

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Answer:

They move freely between the clouds of several atoms, si the correcto Answer is D

Explanation:

Hope this helps.

A chemical change occurs when there is a bond breaking or bond making. A phase change, change in phase and or change in shape does not make a chemical change. A chemical change can be indicated by the heat given off by a reaction or change. Thus, option a is correct.

There are broadly two types of change occurs for a substance namely chemical change or physical change. A physical change is a change in state or phase involves no formation products or breaking of bonds. For example melting of a solid to liquid and boiling of liquid to gas etc.

In a chemical change there makes a bond breaking or making to form a new product. All chemical reactions such as combination reactions, decomposition, displacements etc. are chemical changes.

Every chemical change is associated with an enthalpy of heat energy that is absorbed or released by the system. Thus heat given off is an indication of a chemical change. Hence, option A is correct.

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Answer:

Kc = 50.5

Explanation:

We determine the reaction:

H₂  +  I₂   ⇄   2HI

Initially we have 0.001 molesof H₂

and 0.002 moles of I₂

If we have produced 0.00187 moles of HI in the equilibrium we have to know, how many moles of I₂ and H₂, have reacted.

           H₂     +      I₂      ⇄   2HI

In:     0.001       0.002           -

R:       x                 x                2x

Eq:  0.001-x    0.002-x      0.00187  

x = 0.00187/2 = 9.35×10⁻⁴ moles that have reacted

So in the equilibrium we have:

0.001 - 9.35×10⁻⁴ = 6.5×10⁻⁵  moles of H₂

0.002 - 9.35×10⁻⁴ = 1.065×10⁻³ moles of I₂

Expression for Kc is =  (HI)² / (H₂) . (I₂)

0.00187 ² /  6.5×10⁻⁵ . 1.065×10⁻³ = 50.5

Answer:

The curve that separates the solid and liquid phases on a phase diagram is called the melting curve or fusion curve. This curve indicates the melting point of a substance at various temperatures and pressures. The point where the melting curve intersects with the vaporization curve (the curve that separates the liquid and gas phases) is called the triple point. At the triple point, all three phases of the substance (solid, liquid, and gas) can coexist in equilibrium.

The curve on a phase diagram that indicates the melting point at various temperatures and pressures is called the "melting curve" or "solid-liquid equilibrium curve." This curve separates the solid phase region from the liquid phase region on the diagram.

The melting curve represents the set of conditions (temperature and pressure) under which a substance can simultaneously exist in both solid and liquid phases, indicating its melting point. As you move along the curve, the melting point changes according to the pressure variation. At higher pressures, the melting point typically increases, while at lower pressures, it decreases. This relationship can be attributed to the fact that increased pressure favors the more densely packed phase, which is usually the solid state.

The phase diagram also includes other important points and curves, such as the sublimation curve (separating solid and gas phases), vaporization curve (separating liquid and gas phases), and the triple point (where all three phases coexist in equilibrium). These elements help to understand the behavior of a substance under varying temperature and pressure conditions.

In summary, the melting curve on a phase diagram indicates the melting points of a substance at different pressures and temperatures. It allows for a comprehensive understanding of the phase transitions and equilibria that a substance may undergo under various conditions.

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Answer:

Base is 715 and top is 850.

Explanation:

715 meters above sea level is the base of my landform and 850 meters above sea level is the top of my platform. Base of landform from a sea level is a starting point of a city or region having same topography. This region has a specific height where it spreads we called it top of the platform. The starting point of my location is 715 meters above sea level spreads up to 850 meters of elevation.

When 4340 alloy steel is first completely transformed to austenite, it undergoes a process called homogenization.

This process involves heating the steel to a high temperature, typically around 1700°F, for a specific amount of time to ensure that the carbon and other alloying elements are evenly distributed throughout the material. Once the homogenization process is complete, the steel is cooled rapidly to room temperature.

The microstructural products that are formed during this process include a uniform distribution of fine pearlite, martensite, and austenite grains. The fine pearlite and martensite grains result from the rapid cooling of the steel, while the austenite grains are formed during the homogenization process. These microstructures provide the steel with excellent strength, toughness, and wear resistance, making it ideal for use in high-stress applications such as aircraft landing gear, crankshafts, and gears. Overall, the homogenization process plays a critical role in ensuring that 4340 alloy steel possesses the desired microstructural properties.

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ANSWER:

It is about 92.2 moles of magnesium.

Answer:

Acid

Explanation:

Species CH3ONa and CH3MgBr are less basic than acetylide. The correct option is (d) both a and c.

Acetylide anion is a strong base due to the presence of a highly electronegative sp carbon adjacent to a very electropositive lithium or sodium. The lone pair of electrons on the carbon atom is highly delocalized and can easily abstract a proton from a suitable acid.

On the other hand, both CH3Li and CH3MgBr are weak bases. Although they have negative charges, the carbon atoms are not highly electronegative and they do not stabilize negative charge as effectively as the sp carbon in acetylide anion. Hence, they are less basic than acetylide anion.

CH3ONa is a stronger base than acetylide anion because the oxygen atom in CH3ONa is more electronegative than carbon, and can stabilize negative charge more effectively. The negative charge is localized on the oxygen atom and is not delocalized over a larger region, making it a weaker base than acetylide.

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Answer: is factor that change in a controlled experiment

Explanation: