6. the molecular weight of potassium chloride (kcl) is 74.55 g/mol. how many grams would you need for 650 ml of a 35 mm solution?

Answer:

cholera and salmonella

Explanation:

i believe so

15. To counter the effects of gravity and allow the universe to remain static.

16. The Steady State Theory.

17. Edwin Hubble.

18. No, the galaxies expand away from each other at different rates depending on their distances.

15. Einstein created the cosmological constant in an effort to counteract the forces of gravity, preventing the cosmos from growing or contracting but keeping it static at the same size.

16. The Steady State Theory, which was put forth in the 1920s, claimed that the world is motionless and limitless, and that new stuff is constantly being produced as the universe expands.

17. American astronomer Edwin Hubble observed that galaxies were moving apart from one another, and that the farther they were from one another, the quicker they were travelling, which led him to conclude that the universe was expanding in 1929.

18. Depending on how far apart they are from one another, galaxies separate from one another at varying rates. The greater the distance between any two galaxies

To learn more about gravity visit:

https://brainly.com/question/2230829

#SPJ1

The order of ionic radii from largest to smallest among the following series of isoelectronic ions (Mg²⁺, N³⁻, F⁻, Si⁴⁺) is F⁻ > O²⁻ > Mg²⁺ > Na⁺.

What is isoelectronic ions?

Isoelectronic ions are ions that have the same number of electrons. While they may belong to different elements, they have identical electron configurations. Isoelectronic ions are typically formed when atoms gain or lose electrons to achieve a stable electron configuration similar to a noble gas.

What is Ionic Radius?

Ionic radius refers to the size of an ion. It is defined as the distance between the nucleus of an ion and the outermost shell of its electron cloud. The ionic radius can vary depending on the type of ion and its charge. When atoms lose or gain electrons to form ions, the resulting ions can have different sizes compared to their parent atoms.

For isoelectronic ions, the number of electrons is the same.

Therefore, ionic radii depend only on the nuclear charge.

Nuclear charge increases across a period and down a group, thus decreasing ionic radius.

Learn more about ionic radii:

https://brainly.com/question/8137711

#SPJ11

Answer:

Hydration occurs when minerals are dissolved in water. This means that minerals absorb water and expand. Hence, the correct answer is dissolved into water.

Hydration is the procedure of blending an element with water. It's a chemical reaction that takes place between a chemical compound and water molecules, which helps to break down and dissolve the substance being hydrated.

The hydration process in chemistry entails taking a substance and breaking it down into its component parts. This occurs when a compound or molecule takes in water, which results in the separation of the bonds between the atoms or ions.

The newly-formed ions interact with the water molecules, resulting in a new, hydrated compound.

Hydration can also occur naturally in the body. This is why it is essential to drink enough water throughout the day to remain hydrated. Therefore the correct answer is dissolved into water.

Learn more about the Hydration process here:

brainly.com/question/30464975

#SPJ11

Answer:

₈₈Ra²²⁶  →   ₈₆Rn²²²  + ₂He⁴  + energy

Explanation:

Alpha beta and gamma radiations are the examples of ionizing radiations.

Alpha radiations are emitted as a result of radioactive decay. The atom emit the alpha particles having  two proton and two neutrons. It is also called helium nuclei. When atom undergoes the alpha emission the original atom convert into the atom having mass number less than 4  and atomic number less than 2 as compared to parent atom.

For example:

₈₈Ra²²⁶  →   ₈₆Rn²²²  + ₂He⁴  + energy

Properties of alpha radiation:

Alpha radiations can travel in a short distance.

These radiations can not penetrate into the skin or clothes.

These radiations can be harmful for the human if these are inhaled.

These radiations can be stopped by a piece of paper.

Another example:

₉₂U²³⁸   →   ₉₀Th²³⁴  + ₂He⁴  + energy

The given chemical equation is:

MgCl + Na(OH)₃ → Mg₃(OH)₂ + NaCl

        MgCl + Na(OH)₃ → Mg₃(OH)₂ + NaCl

        3 MgCl + Na(OH)₃ → Mg₃(OH)₂ + NaCl

        3 MgCl + Na(OH)₃ → Mg₃(OH)₂ + 3 NaCl

        3 MgCl + 3 Na(OH)₃ → Mg₃(OH)₂ + 3 NaCl

        3 MgCl + 3 Na(OH)₃ → Mg₃(OH)₂ + 3 NaCl + 6 H₂O

        3 MgCl + 3 Na(OH)₃ → 3 Mg₃(OH)₂ + 3 NaCl + 6 H₂O

For such more questions on Balancing equations

https://brainly.com/question/26694427

#SPJ8

ANSWER

The initial volume of the acid is 260mL

EXPLANATION

Given that;

The final volume of the ethanoic acid is 4.5L

The final concentration of the ethanoic acid is 1.0 mol/L

The initial concentration of the ethanoic acid is 17.4 mol/L

Follow the steps below to find the volume of the ethanoic acid

Step 1; Apply the dilution formula

Step 2; Substitute the given data into the formula

Therefore, the initial volume of the acid is 260mL

Therefore, the pH and the equilibrium concentration of S²⁻ in a 6.89x10⁻² M hydrosulfuric acid solution are pH = 7.78 and [S²⁻] = 2.31x10⁻¹¹ M.

Hydrosulfuric acid (H₂S) is a weak acid that dissociates in water to produce hydrogen ions (H⁺) and bisulfide ions (HS⁻). H₂S(aq) + H₂O(l) ⇌ H₃O⁺(aq) + HS⁻(aq)

The bisulfide ions (HS⁻) in turn reacts with water to produce hydronium ions (H₃O⁺) and sulfide ions (S²⁻).

HS⁻(aq) + H₂O(l) ⇌ H₃O⁺(aq) + S²⁻(aq) Ka1

= 1.0x10⁻⁷,

Ka2 = 1.0x10⁻¹⁹

To calculate the pH and the equilibrium concentration of S²⁻ in a 6.89x10⁻² M H₂S(aq) solution, we must first determine if H₂S(aq) is a strong or weak acid.

It has Ka1 = 1.0x10⁻⁷, which is a very small value; thus, we can conclude that H₂S(aq) is a weak acid.

To calculate the equilibrium concentration of S²⁻ in a 6.89x10⁻² M H₂S(aq) solution, we need to use the Ka2 value (Ka2 = 1.0x10⁻¹⁹) and a chemical equilibrium table.

[H₂S] = 6.89x10⁻² M[H₃O⁺] [HS⁻] [S²⁻]

Initial 0 0 0Change -x +x +x

Equilibrium (6.89x10⁻² - x) x xKa2 = [H₃O⁺][S²⁻]/[HS⁻]1.0x10⁻¹⁹

= x² / (6.89x10⁻² - x)

Simplifying: 1.0x10⁻¹⁹ = x² / (6.89x10⁻²)

Thus: x = √[(1.0x10⁻¹⁹)(6.89x10⁻²)]

x = 2.31x10⁻¹¹ M

Thus, [S²⁻] = 2.31x10⁻¹¹ M

To calculate the pH of the solution, we can use the Ka1 value and the following chemical equilibrium table.

[H₂S] = 6.89x10⁻² M[H₃O⁺] [HS⁻] [S²⁻]

Initial 0 0 0

Change -x +x +x

Equilibrium (6.89x10⁻² - x) x x

Ka1 = [H₃O⁺][HS⁻]/[H₂S]1.0x10⁻⁷

= x(6.89x10⁻² - x) / (6.89x10⁻²)

Simplifying: 1.0x10⁻⁷ = x(6.89x10⁻² - x) / (6.89x10⁻²)

Thus: x = 1.66x10⁻⁸ M[H₃O⁺]

= 1.66x10⁻⁸ M

Then, pH = -log[H₃O⁺]

= -log(1.66x10⁻⁸)

= 7.78 (rounded to two decimal places)

To know more about concentration visit:

https://brainly.com/question/30862855

#SPJ11

The following compounds have integer i values:KClNa2CO3

The following compounds have integer i values: KCl and Na2CO3.

i stands for van't Hoff factor and is the number of particles formed from one solute molecule in a solution.

An i value of 1 means that no particles are produced upon solvation or that the solute molecule exists independently in the solvent.

Conversely, an i value greater than one indicates that one molecule of solute produces more than one particle in the solvent. This includes molecules that dissociate into ions, form complexes, or exist in a solvent as aggregates.

It is worth noting that the i value is an experimentally derived value and may not necessarily be an integer.

According to the question, the following compounds have integer i values:KClNa2CO3

Learn more about molecule

brainly.com/question/32298217

#SPJ11

A) CH3NH2

This is because CH3NH2 recieved H from CH3COOH

Answer:

HCl → H+ + Cl-

pH = -log[H+] = 1.469

Explanation:

Strong acid doesn't establish equilibrium. To determine the pH of a strong acid, the concentration of the acid is equal to the concentration of the hydrogen ion, so take the -log[H+], which will give you the pH. And you can see that it is a small number, and that's because HCl is a strong acid.

The pH of a solution can be calculated using the equation: pH = -log[H+]

pH is a measure of the acidity or alkalinity of a solution. It is a scale that ranges from 0 to 14, with 7 being considered neutral. A pH value below 7 indicates acidity, while a pH value above 7 indicates alkalinity.

In this case, the HCl solution has a concentration of 0.0340 M, which represents the concentration of H+ ions. Since HCl is a strong acid, it completely dissociates in water, yielding one H+ ion for every HCl molecule.

Therefore, the concentration of H+ ions is equal to the concentration of the HCl solution, which is 0.0340 M.

Taking the negative logarithm of 0.0340, we have:

pH = -log(0.0340)

Using a calculator, we find that the pH of the 0.0340 M HCl solution is approximately 1.47.

Learn more about HCl solution at:

https://brainly.com/question/31019516

#SPJ2

Answer:

The best soil for most plants to ensure optimum growth is a rich, sandy loam.

Answer:

Because both the zones have different compositions.

Explanation:

The continental crust is composed of mainly graphite whereas the oceanic crust is made up of basalt. The oceanic plates are thinner than the continental plates. Also the oceanic plates are much denser as compared to the continental plates. Now the continental plates at the convergent boundary gained thickness as they are pushed upward. These plates or zones are of different composition an densities and so when they collide different features can be seen at the two conversion zones.

Answer:

Its the thin lining around the cell the moniters what gets in and out of the cell.

Explanation:

In 1911, astronomers Hertzsprung and Russell independently plotted the spectral class (temperature) against the luminosity (energy emited) for known stars. They discovered that the stars were grouped together in different regions on the graph. This graph is now known as the Hertzsprung- Russell Diagram (see attached image).

The HR diagram shows us that there are different types of stars and that stars evolve in different ways depending on their initial mass. This can tell us what reactions are occurring in the stars' cores.

Stars follow a distinct path as seen on the diagram, and evolve in the following ways:

- Main Sequence > red giant > planetary nebula > white dwarf

- Main Sequence > supergiant > supernova > blackhole/neutron star

- Main Sequence > white dwarf

Temperature: surface temperature of stars

Absolute magnitude: measure of the luminosity or brightness of a star

Luminosity: the relative magnitude, relative to the magnitude of our sun

Spectral Class: temperature group of stars. categorised into OBAFGKM. Stars on the left the the hottest.

Main Sequence: Majority of stars lie in the main sequence, including our sun. These stars are fusing hydrogen to helium in their cores.

Red giants/Super giants: consists of a small minority of stars found at the top right of the HR diagram. These are very large and luminous, but have a much cooler temperature.

White Dwarfs: consists of a majority of stars, found at the bottom left of the HR diagram. These have very low luminosity, despite relatively high surface temp. and undergo fusion. These will not evolve anymore and will continue until all energy is used up in its core, and die out.

Blue Giants: rare, short-lived stars, and very luminous, hot, bright, and massive. These are found in the top left of HR diagrams, and are fusing heavier elements in their cores. They don't last long and will quickly evolve into white dwarfs.

To learn more about Hertzsprung-Russell Diagrams:

https://brainly.com/question/14857582

The molarity of the calcium hydroxide solution is 0.0696 M

These are essentially 4-step problems.

1. Write and balance the equation. If we call potassium hydrogen phthalate just KHP, then

Ca(OH)2 + 2KHP ==> 2H2O + CaP + K2P

2. Convert grams to moles. moles KHP = 0.990/molar mass KHC8H4O4 = 0.990/179 = approximately 0.0055

3. Using the coefficients in the balanced equation, convert moles KHP to moles Ca(OH)2

0.0055moles KHP x (1 mole Ca(OH)2/2 moles KHP) = 0.0055 x (1/2) = 0.00275 moles Ca(OH)2.

4. M Ca(OH)2 = moles Ca(OH)2/L Ca(OH)2

 M Ca(OH)2 = 0.00275/0.0395 = approximately 0.0696 M

Part B is done the same way. Now that you have the Ca(OH)2 standardized, use that, with the same process, to determine the molarity of the HI.

Remember that moles = M x L.

Learn more about Molarity:

brainly.com/question/26873446

#SPJ4

Answer:

both bonding electrons come from the oxygen atom

Explanation:

A coordinate covalent bond is said to be formed when an electron pair is donated into a empty orbital of an atom from a filled orbital of another atom.

In this type of covalent bond, the shared electron pair is furnished by only one of the bonding species.

The bonding between H^+ and H2O to form H3O^+ involves donation of a lone pair of electrons on oxygen into the empty 1s orbital of  H^+ hence the two bonding electrons come from oxygen. This is why the bond is called a coordinate covalent bond.

Answer:

hope it helps you

Explanation:

Once one shell is full, the next electron that is added has to move to the next shell. So... for the element of NEON, you already know that the atomic number tells you the number of electrons. That means there are 10 electrons in a neon atom.

Answer: i think 250ML

Explanation:

Answer:

9.90

Explanation:

Given [H+] = 1.25 x 10^-10 M, we can calculate the pH using the formula:

pH = -log10([H+])

pH = -log10(1.25 x 10^-10)

Using logarithmic properties:

pH = -log10(1.25) - log10(10^-10)

Since log10(10^-10) is equal to -10:

pH = -log10(1.25) - (-10)

pH = -log10(1.25) + 10

Now, evaluating the logarithm using a calculator:

pH = -0.0969 + 10

pH = 9.9031

Therefore, the pH of the solution with [H+] = 1.25 x 10^-10 M is approximately 9.9031. Rounding it to two decimal places, the pH is approximately 9.90.

The value of the resistor R that will produce a force of 9.00×10⁻⁵ N between the two parallel wires separated by 5.0 mm and each having a length of 10 cm is approximately 1.8 Ω.

To calculate the value of the resistor R, we can use the formula for the magnetic force between two parallel wires:

\[ F = \frac{{\mu_0 \cdot I_1 \cdot I_2 \cdot \ell}}{{2 \pi \cdot d}} \]

where F is the force, μ₀ is the permeability of free space, I₁ and I₂ are the currents in the wires, ℓ is the length of the wires, and d is the separation between the wires.

In this case, the force F is given as 9.00×10⁻⁵ N, the length of each wire ℓ is 10 cm (or 0.10 m), and the separation between the wires d is 5.0 mm (or 0.005 m).

By rearranging the formula, we can solve for R:

\[ R = \frac{{2 \pi \cdot d \cdot F}}{{\mu_0 \cdot \ell}} \]

Substituting the given values into the equation, we get:

\[ R = \frac{{2 \cdot 3.1416 \cdot 0.005 \cdot 9.00×10⁻⁵}}{{4\pi × 10^{-7} \cdot 0.10}} \approx 1.8 \, \Omega \]

Learn more about value

brainly.com/question/30145972

#SPJ11

Answer:

0.2moles

Explanation:

 1 grams Cu(NO3)2 to mol = 0.159952398166305

10 grams Cu(NO3)2 to mol = 0.159952398166305

if we round that up the only valid answers are either 0.1 or 0.2

Answer:

Soluble

Explanation:

hope this helps

Answer: First Scientific method

Second: question

Third: research

Fourth: hypothesis

Fifth: experiment

Sixth: procedure

Seventh: variable

Eighth: observe

Ninth: interpret

Tenth: record

Eleventh: ethical

Twelfth: conclusion

Explanation: That is the order that the words in the box go in. Hope this helps!

The mass density of NaCl is (23 + 35.5)/175.6 g/Å^3 = 0.391 g/cm^3.

(a) In a (100) plane, the Na and Cl atoms form a square lattice with Na atoms at the corners and Cl atoms at the center of each side of the square.

(b) The lattice constant is the distance between adjacent Na or Cl atoms. In a simple cubic lattice, this is equal to the diameter of the sphere (2 x radius) plus the distance between the centers of adjacent spheres. For NaCl, this gives a lattice constant of 5.6 Å.

(c) The volume density of Na atoms is the number of Na atoms per unit volume, which is equal to the inverse of the volume of the unit cell. For NaCl, the unit cell has a volume of (5.6 Å)^3 = 175.6 Å^3, so the volume density of Na atoms is 1/175.6 Å^3 = 0.0057 Å^-3. Similarly, the volume density of Cl atoms is also 0.0057 Å^-3.

(d) The mass density of NaCl is the sum of the masses of the Na and Cl atoms in the unit cell divided by the volume of the unit cell. The mass of an Na atom is 23 g/mol and the mass of a Cl atom is 35.5 g/mol. The number of Na atoms in the unit cell is 1 and the number of Cl atoms is also 1.

Therefore, the mass density of NaCl is (23 + 35.5)/175.6 g/Å^3 = 0.391 g/cm^3.

To know about mass :

https://brainly.com/question/11954533

#SPJ11

Answer:

The Machine exerts a force of 9N.

Explanation:

Initial velocity (u) = 0 m/s

Final velocity (v) = 30 m/s

Time (t) = 0.5 s

Acceleration (a) = (v-u)/t

= (30-0)/0.5 m/s²

= 30/0.5 m/s²

= 60 m/s²

Mass = 0.15 kg

Force = Mass*Acceleration

= 0.15*60 N

= 9 N

Answer:

The Machine exerts a force of 9N.

Explanation:

Plato

Answer:

they are only efficient in certain areas

Explanation:

Wind turbine are efficient only in certain areas it is a problem with using wind turbines to produce energy.

Wind turbine convert the wind energy into the electricity. It is a power generating device that converts the kinetic energy in to electrical energy.

Now lets check all option one by one:

Option (A): Wind turbines are efficient only in certain areas it is a problem with using wind turbines to produce energy because the flow of air from areas of high pressure towards the lower pressure.

So, it is correct option.

Option (B): Wind turbines occupy a lot of space to work.

So, it is incorrect option.

Option (C): Wind turbines produce a large amount of energy is not a problem.

So, it is incorrect option.

Option (D): Wind turbines does not create a pollution or it does not pollute the air or water.

So, it is incorrect option.

Thus, we can say that Wind turbines are efficient only in certain areas it is a problem with using wind turbines to produce energy because the flow of air from areas of high pressure towards the lower pressure.

Learn more about the Wind turbines here: https://brainly.com/question/883099
#SPJ2