a. what mass of chromium would be produced from the reaction of 57.0 g of potassium with 199 g of chromium (ii) bromide according to the following reaction?
b. which reactant is in excess and how many grams of this reactant are left over ?
2k + CrBr2 -> 2kbr + cr

Answer:

d

Explanation:

its artist school kills artists

Answer:

Hello There!!

Explanation:

The answer is D.artists because they trigger colors.

hope this helps,have a great day!!

~Pinky~

Sedimentation, filtration, and coagulation are the treatments that will help remove contaminants from minerals or from the pipes carrying water from a source.

Sedimentation is a process in which suspended particles settle out of water. It is one of the most basic techniques for removing particles from water. As particles settle, they become trapped in the bottom of a container or settle to the ground in an outdoor setting

Filtration is a method of removing particles from a fluid. It is a physical or chemical separation method that separates solids from fluids (liquids or gases) by adding a medium through which only the fluid can pass.

Coagulation is the process of using chemicals to remove contaminants from water. By creating a chemical reaction, coagulation destabilizes particles and causes them to clump together. This helps to remove the contaminants from the water.

Disinfection is the process of eliminating or destroying pathogens that cause infection. Disinfection eliminates harmful microorganisms by destroying or inactivating them. The disinfectant is a chemical or physical agent that is used to destroy or inactivate harmful microorganisms.

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Answer:

KI

Explanation:

K is 1+  & I is 1- so we need 1 of each to balance out the compound.

If the MDS (Minimum Data Set) is successfully implemented, several positive outcomes can be expected. The MDS is a standardized assessment tool used in healthcare settings to evaluate the physical, mental, and psychosocial well-being of patients.

Its successful implementation can lead to improved patient care, more efficient resource allocation, and enhanced data analysis.With the MDS in place, healthcare providers can gather consistent and comprehensive data about patients, enabling better understanding of their needs and tailoring of individualized care plans.

This can result in improved treatment outcomes and patient satisfaction. Additionally, the MDS facilitates effective communication and information sharing among healthcare professionals, leading to coordinated care and reduced errors.From a broader perspective, successful implementation of the MDS allows for accurate and reliable data collection, enabling robust research and evidence-based decision-making.

This can contribute to advancements in healthcare practices, policy development, and quality improvement initiatives. Ultimately, the successful implementation of the MDS can enhance patient outcomes, improve healthcare delivery, and drive positive changes in the healthcare system as a whole.

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The conclusion that can be drawn from the observation is that a glow stick glows longer at lower temperatures than at room temperature . The test variables are temperature and duration of reaction.

In this reaction, we observe that a glow stick kept in the freezer glows for a longer duration than a glow stick kept at room temperature. This means that temperature influences the duration of the reaction.

The simplest interpretation of this observation is that a glow stick glows longer at lower temperatures than at room temperature hence the glow stick in the freezer is found to glows for a longer duration than a glow stick kept at room temperature.

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Answer:

lemme slurp them juices out of that p*ssy. You must taste sweet.

Explanation:

Answer:

if you meant the Earth's revolving orbit. It is an elliptical orbit.

will you mark me the BRAINLIEST please

Answer:

See attached picture.

Explanation:

Hello,

In this case, on the attached picture you will find the required line structures for the cis and trans configurations of the given compound (2-pentene). Take into account for the cis that the adjacent carbons to those having the double bond remain in the same plane, whereas for the trans one, the adjacent carbons remain in a different plane.

Regards-

Answer:

entire, increasing, decreasing

Explanation:

The EM Spectrum is the entire range of EM waves in order of increasing frequency and decreasing wavelength.

The frequency of the electromagnetic radiation is 2.94 * 10^15 Hz and it belongs to the visible portion of the spectrum.

We know that according to the Bohr model of the atom, electrons are able to move from a lower to a higher energy level and then the electron could return to the lower energy level and by so doing they can give up the energy that they took in when they moved to the higher energy level.

Let us know that;

Final energy level = 1

Initial level = 3

Rydberg constant = RH

Wavelength = λ

Now we have;

1/λ = RH(1/\(n_{2} ^{2}\) - 1/\(n_{1} ^{2}\))

We have;

1/λ = 1.097 * 10^7(1/1^2 - 1/3^2)

1/λ = 1.097 * 10^7(1 - 0.11)

λ = 1.02 * 10^-7 m

The frequency can be gotten from;

f = c/λ

f = 3 * 10^8/1.02 * 10^-7

f = 2.94 * 10^15 Hz

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This technique has been used to identify the presence of gases such as oxygen, methane, and carbon dioxide in the atmospheres of exoplanets.  

i) To estimate the frequency of the violet (leftmost) emission, we can use the equation v = c/λ, where v is frequency, c is the speed of light (3.00 x 10^8 m/s), and λ is the wavelength of the emission in meters. The wavelength of the violet emission is 400 nm or 400 x 10^-9 m, so the frequency can be calculated as v = (3.00 x 10^8 m/s) / (400 x 10^-9 m) = 7.50 x 10^14 Hz.

ii) To estimate the energy of the violet emission, we can use the equation E = hv, where E is energy, h is Planck's constant (6.63 x 10^-34 Js), and v is frequency in Hz. Substituting the frequency calculated in part (i), we get E = (6.63 x 10^-34 Js) x (7.50 x 10^14 Hz) = 4.97 x 10^-19 J.

b. The spectral lines are produced by the electrons within the atoms of this element, which can absorb or emit specific amounts of energy to move between different energy levels. These energy transitions result in the emission or absorption of photons with specific wavelengths and frequencies, giving rise to the observed emission spectrum.

c. The violet emission line represents the photon with the most energy since it has the shortest wavelength (400 nm) and highest frequency (7.50 x 10^14 Hz) among the lines shown. This highest energy does not necessarily represent the energy of the valence electrons, but rather corresponds to the specific energy transitions occurring within the atoms of the element.

d. Emission spectra can be used to determine the gases present in the atmosphere of a far-away planet by analyzing the specific wavelengths of the emitted or absorbed light from the planet. Each gas has a unique emission or absorption spectrum, allowing scientists to identify the gases present in the planet's atmosphere.

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Answer:

A landform is a feature on the Earth's surface that is part of the terrain. Mountains, hills, plateaus, and plains are the four major types of landforms. Minor landforms include buttes, canyons, valleys, and basins. Tectonic plate movement under the Earth can create landforms by pushing up mountains and hills.

Explanation:

"Waterways" are the other large features that cover the surface of the earth.

A canal would be any body of water throughout which boats may move. Waterways, on the other hand, comprise waterways that seem to be expansive as well as shallow enough already to allow freight-carrying watercraft just to travel through.

Some bodies of water are usually regularly dredged to maintain an appropriately deep course throughout all circumstances. Dams change the depth of other rivers in particular parts.

Thus the response above i.e., "Option B" is correct.

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Answer:

C.) protons and neutrons

Explanation:

Most atoms contain proton(s), neutron(s), and electron(s). Within the nucleus of an atom, there are protons and neutrons. Electrons are located outside of the nucleus.

The correct conversion factor when converting from moles to liters is the molar volume at a given temperature and pressure.

This value is dependent on the ideal gas law and can be determined using the ideal gas equation PV = nRT, where P represents pressure, V represents volume, n represents the number of moles, R is the ideal gas constant, and T is the temperature in Kelvin.

The molar volume of an ideal gas at standard temperature and pressure (STP), which is 0 degrees Celsius (273.15 Kelvin) and 1 atmosphere (101.3 kilopascals), is approximately 22.4 liters per mole.

Therefore, to convert moles to liters, you can multiply the number of moles by the molar volume at STP, which gives you the volume in liters.

It's important to note that the molar volume is an approximation and assumes ideal gas behavior.

Additionally, if you are working with gases at different temperatures and pressures, you would need to use the appropriate molar volume value corresponding to the given conditions.

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Answer:

3.0 mL is the volume of the ruby. The volume of a container is commonly believed to be its capacity.

Volume is a three-dimensional spatial measurement. It is frequently mathematically quantified using SI-derived units or different imperial or The us customary units. Volume is connected to the notion of length (cubed).

The volume of a container is commonly believed to be its capacity; that is, the quantity of fluid (gas or liquid) that perhaps the container can hold, instead of the amount of space that the container occupies.

volume of water = 4.1 mL

volume of water + the volume of the ruby gemstone = 7.1 mL

volume of the ruby gemstone can be calculated as:

7.1 mL - 4.1 mL = 3.0 mL

Therefore, 3.0 mL is the volume of the ruby.

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Answer:

6.573

Explanation:

2.7500 x 1cal/4.184kj x 1Cal/1000cal = 6.573

Answer:

266Lr

Thirteen isotopes of lawrencium are currently known; the most stable is 266Lr with a half-life of 11 hours, but the shorter-lived 260Lr (half-life 2.7 minutes) is most commonly used in chemistry because it can be produced on a larger scale.

Explanation:

hopefully that helps you

Concentration of calcium = 0.075 moles.

Mass of precipitate = 16.98g.

The molarity of a solution is the number of moles of solute in a volume of 1000 mL.

A substance's molar mass is equal to 1 mole of any substance.

A sample's mass is determined by multiplying its molar mass by the number of its moles.

MAgCl = 143.32 g/mol

Balanced chemical equation:

2 AgNO3 (aq) + CaCl2 (aq) → Ca(NO3)2 (aq) + 2 AgCl (s)

Molar ratio of AgNO3, CaCl2, Ca(NO3)2, AgCl are 2 : 1 : 1 : 2 respectively.

Net ionic equation:

2 Ag+ (aq)  +  2 Cl- (aq)  →  2 AgCl (s)

or,  Ag+ (aq)  +  Cl- (aq)  →  AgCl (s)

So, the number of moles of moles of Ca+2 will not change after the completion of reacton,

as it acts as a spectetor ion, i.e. do not take part in effective reaction.

only the volume increases.

Hence, total volume of the solution has become = 75 + 75 = 150 mL

Now, 2.1 M CaCl2

= There are 2.1 moles of CaCl2  in 1000 mL of the solution.

So, in 75 mL of the solution, there are [ (2.1/1000) x 75 ]

= 0.1575 mole of CaCl2

= 0.1575 mole of Ca+2 (aq)

After completion of the reaction, there are 0.1575 mole of Ca+2 (aq) ion in the 150 mL of solution.

In 1000 mL of solution there will be [(0.1575/150) x 1000] = 1.05 mol/L

New molarity of Ca+2 (aq) ion = 1.05 M

Again,

1.5 M AgNO3

= There are 1.5 moles of AgNO3 in 1000 mL of the sample.

So, in 79 mL of the solution, there are [ (1.5/1000) x 79 ] = 0.1185 mole of AgNO3  

1.0 M CaCl2

= There are 1.0 moles of CaCl2  in 1000 mL of the sample.

So, in 75 mL of the solution, there are [ (1.0/1000) x 75 ] = 0.075 mole of CaCl2

Balanced chemical equation:

2 AgNO3 (aq) + CaCl2 (aq) → Ca(NO3)2 (aq) + 2 AgCl (s)

Molar ratio of AgNO3, CaCl2, Ca(NO3)2, AgCl are 2 : 1 : 1 : 2 respectively.

According to the molar ratio, 2 moles of AgNO3 consumes 1 mole of CaCl2

and produce 1 mole of Ca(NO3)2 and 2 moles of AgCl (s).

In this case, the limiting reagent is AgNO3

Hence, 0.1185 moles of  CaCl2 will be consumed by (0.1185/2) = 0.05925 mole of  AgNO3

Which will produce 0.1185 moles of AgCl (s).

We know, 1 mole of AgCl = 143.32 g of AgCl ( as MAgCl = 143.32 g/mol.)

So, 0.1185 mole of AgCl = 143.32 x 0.1185

= 16.9834 g of AgCl.

~16.98 gm of AgCl.

Therefore

Concentration calcium = 0.075 moles

Mass of precipitate = 16.98g

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Answer:

251 CrS3 x 1 moles Cr2S3/200 g Cr2S3 x 1 moles Cr2O3/1 moles Cr2S3 = 1.25 moles Cr2O3

Explanation:

Cr = 2x 52 = 104 g

S = 3 x 32 = 96 g

total 200

Answer:

Percent yield = 66.7%

Explanation:

Percent yield is a way to determine the efficiency of a reaction. Is widely used in organic chemistry. The formula is:

Percent yield = Actual yield / Theoretical yield * 100

In the problem, the actual yield obtained was 60g and theoretical yield is 90g. Replacing:

Percent yield = 60g / 90g * 100

Answer:

c. H2(g) + CuO(s) → Cu(s) + H2O(l)

e. H2(g) + Cl2(g) → 2HCl(g)

Explanation:

A redox reaction is a reaction that involves a changes in oxidation number of the species involved in the reaction.

The oxidizing agent experiences a decrease in oxidation number while the reducing agent experiences an increase in oxidation number.

For H2(g) + CuO(s) → Cu(s) + H2O(l)

Copper is reduced from +2 to 0 while hydrogen is oxidized from 0 to +2 Hence hydrogen is the reducing agent while copper is the oxidizing agent.

For H2(g) + Cl2(g) → 2HCl(g)

Chlorine is reduced from 0 to -1 while hydrogen is oxidized from 0 to +1. Hence chlorine is the oxidizing agent while hydrogen is the reducing agent.

Answer:

a. 497g H2SO4.

b. 124g HNO3

Explanation:

Molality, m, is an unit of concentration defined as the moles of solute per kg of solvent.

a. The moles of solute, H2SO4 are:

1.16kg * (4.37mol / kg) = 5.07 moles H2SO4

Mass -Molar mass H2SO4: 98g/mol-

5.07 moles H2SO4 * (98g / mol) = 497g H2SO4

b. The moles of solute, HNO3 are:

1.97kg * (1.00mol / kg) = 1.97 moles HNO3

Mass -Molar mass HNO3: 63.01g/mol-

1.97 moles HNO3 * (63.01g / mol) = 124g HNO3

The formula you provided calculates the percent change in pH based on the difference between the pH at 5 drops and the pH at 0 drops. Here's how you can use the formula:

1. Determine the pH at 5 drops and the pH at 0 drops.

Let's say the pH at 5 drops is 4 and the pH at 0 drops is 7.

2. Plug the values into the formula:

Percent Change of pH = 100% × (pH at 5 drops - pH at 0 drops) / pH at 0 drops

Percent Change of pH = 100% × (4 - 7) / 7

3. Calculate the numerator:

4 - 7 = -3

4. Calculate the denominator:

Percent Change of pH = 100% × (-3) / 7

5. Calculate the percent change:

Percent Change of pH = -300% / 7

Therefore, the percent change in pH from 0 drops to 5 drops is approximately -42.86%.

Answer: I want to say A. False

Explanation:

It's less likely for high energy Bremsstrahlung x-rays to be produced than lower energy x-rays due to the fact that most do not get close enough to the nucleus.

Answer:

Example 1

palladium(II) nitrate,

Example 2

Metal catalysts such as Fe, Ni, Mo, and Co are routinely used in the manufacture of CNMs.

Explanation

The three metals used in catalytic converters — rhodium, platinum and palladium — are part of a category known as platinum group metals, or PGMs, which are known for their catalytic properties.

The value of the solubility product constant (Ksp) for the salt AB at 25°C is 2.60 x 10⁻³.

The solubility product constant (Ksp) is the equilibrium constant for the dissolution of a sparingly soluble salt in water. It is given by the expression Ksp = [A⁺][B⁻] where [A⁺] and [B⁻] are the molar concentrations of the cations and anions in solution, respectively.

In this case, the balanced equation for the dissolution of the salt AB is: AB(s) ⇌ A⁺(aq) + B⁻(aq) We know that at 25°C, only 0.0510 mol of the salt AB is soluble in 1.00 L of water. This corresponds to a molar solubility of

s = 0.0510 mol / 1.00 L = 0.0510 M

At equilibrium, the molar concentration of A⁺ and B⁻ will also be 0.0510 M. Therefore, the value of Ksp for the salt AB at 25°C can be calculated as: Ksp = [A⁺][B⁻] = (0.0510 M) * (0.0510 M) = 2.60 x 10⁻³.

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In order to answer this question we will use the molar mass of Chromium, which is 52 g/mol, that means that in every 1 mol of Cr, we will have 52 grams of it:

52 g = 1 mol

260 g = x moles

52x = 260

x = 5 moles of Chromium

Answer & Explanation:

Orbitals are made up of subshells- s, p, d, f.

Each subshell can only accommodate a certain number of electrons:

s- 2 electrons

p- 6 electrons

d- 10 electrons

f- 14 electrons.

The subshells are used to denote the element by spelling out its electronic configuration.

Hope this was helpful!

Answer:

B. 7 protons, 10 electrons

Explanation:

hope this helps :)