a 100.0 ml sample of 0.10 m nh3 is reacted with 50.0 ml of 0.10 m hno3. determine the ph of the final solution. the kb of nh3 is 1.8 × 10−5. a) 4.74 b) 7.78 c) 10.34 d) 9.26 e) 7.05

Answer:

They move freely in all directions.

Explanation:

Answer:

1.59

Explanation:

14=pOH+pH

pOH=14-12.41

pOH=1.59

Answer:

I would say voting. I hope that helped or just report my comment.

Explanation:

Answer:

Because Environmental Risks

Explanation:

Medicines poured down the drain can enter the environment and your community’s drinking water supplies. And it can cause a lot of diseases!

Answer:

B: It depends on how a substance was formed.

Explanation:

took the test

Intensive property is the same for every sample of a single substance.

INTENSIVE AND EXTENSIVE PROPERTIES:

Hence, intensive property is the same for every sample of a single substance.

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The names of the cation in each of the following compounds CaO, Na2SO4, KClO4, Fe (NO3) 2, Cr (OH) 3 are as the cation in CaO is Ca2+, in Na2SO4 it is Na+, in KClO4 it is K+, in Fe(NO3)2 it is Fe2+, and in Cr(OH)3 it is Cr3+.

In a chemical compound, cations are positively charged ions that are formed by the loss of one or more electrons from an atom.

The cation is named after the name of the element from which it is derived, followed by the word "ion". For example, the cation in CaO is Ca2+, which is derived from the element calcium.

So, the name of the cation in CaO is "calcium ion".

Similarly, the cation in Na2SO4 is Na+, which is derived from the element sodium. So, the name of the cation in Na2SO4 is "sodium ion".

The names of the cations in the remaining compounds can be determined in the same way.

The cations in these compounds are Calcium (Ca), Sodium (Na), Potassium (K), Iron(II) (Fe), and Chromium(III) (Cr), respectively.

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The wavelength of the indigo light can be calculated using the formula:

wavelength = speed of light / frequency

The speed of light is approximately 3.00 x 10^8 m/s.

So, substituting the given frequency into the formula:

wavelength = (3.00 x 10^8 m/s) / (7.08 x 10^14 Hz)

wavelength = 4.23 x 10^-7 meters or approximately 423 nanometers (nm).

Therefore, the wavelength of indigo light with a frequency of 7.08 x 10^14 Hz is approximately 423 nm.

Answer:

covalent bond

Explanation:

Answer:

The covalent bond is the chemical bond formed when two atoms share electrons.

The volume, in milliliters, of the krypton gas is 523ml.

The Ideal gas law is the equation of state of a hypothetical ideal gas. It is a good approximation to the behaviour of many gases under many conditions, although it has several limitations. The ideal gas equation can be written as

                                    PV = nRT

where,

P = Pressure

V = Volume

T = Temperature

n = number of moles

Given,

Mass = 10g

Pressure = 563 mm Hg

Temperature = 298 K

moles of Kr =mass / atomic mass

= 10 / 84

= 0.119 moles

PV = nRT

563 × V = 0.119 × 8.314 × 298

V = 0.523L = 523ml

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A

Explanation:

no proof just to know I'm internet gal

Answer:

Calcium Carbonate base and Sulphuric acid.

CaCO3 and H2SO4

Answer:

Skeletal equation : Ca(OH)2 + H2SO4 ----> CaSO4 + H2O

Balanced equation : Ca(OH)2 + H2SO4 ---> CaSO4 + 2H2O

Hope it helps

In the reaction, NH4HS(s)⇌NH3(g)+H2S(g), more of the solid will form.

In a chemical reaction, equilibrium is the state where both the reactants and products are present in concentrations which have no further tendency to change with time, so there is also no observable change in the properties of the system. This state results when forward reaction proceeds at the same rate as reverse reaction.

If Q= K then equilibrium

Q>k, then reversed direction shift

Q<k, then forward direction shift

Given, Kc=8.5×10−3

Given [NH3]=0.166  and M [H2S]=0.166 M

Here Q= 0.166 M (given)

It shows Q> k that is 0.166 > 8.5×10−3

Therefore, more of the solid will form.

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The ignition occurs when a mixture of fuel & oxygen encounter an external heat source with sufficient heat Piloted ignition.

When a volatile fuel is close to a nearby local energy source (pilot) and reaches its lower limit of flammability in air, piloted ignition may be possible. The flame that originates in the premixed system spreads outward from the pilot. The first law of thermodynamics for systems with fixed mass only describes the energetics of this process.

The science of thermodynamics examines how heat, work, temperature, and energy are related. The general topic of thermodynamics is the transfer of energy from one location or form to another. The fundamental idea is that heat is a type of energy that is equivalent to a specific quantity of mechanical labor.

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Answer:

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

From the question

volume = 55.10 cm³

Density = 6.720 g/cm³

The mass is

mass = 55.10 × 6.720 = 370.272

We have the final answer as

Hope this helps you

According to the question the five number are Tetrahedral,Trigonal Planar, Trigonal Bipyramidal,Octahedral,Linear.

Linear is a type of mathematical model or function which can be used to describe a relationship between two or more variables. A linear model takes the form of a line when plotted on a graph, and can be used to represent various types of relationships, from simple linear functions to more complex ones. In linear models, the variables are assumed to have a linear relationship, meaning that a change in one variable causes a proportional change in the other. Linear models are often used in data analysis, forecasting, and optimization, and are a cornerstone of many statistical methods.

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The decay of crystal violet is a first-order reaction, so it does not matter when data collection starts after mixing with sodium hydroxide.

In a first-order reaction, the rate of decay is directly proportional to the concentration of the reactant. The reaction rate is determined by the concentration of the crystal violet, and it decreases exponentially over time. Therefore, regardless of when data collection begins after mixing with sodium hydroxide, the rate of decay remains consistent as long as the concentration of crystal violet is within the measurable range.

This is because the reaction follows a mathematical relationship that allows for accurate determination of the reaction rate and half-life based on the concentration at any given time.

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The complete question-

based on  the decay of crystal violet, explain why it did not matter when you started collecting data after you mixed the crystal violet with the sodium hydroxide?

The empitical formula shows the simplest ratio of elements in a compound (not the total number of atoms in the molecule).

So to find the empirical formula we need to calculate how many moles of each atom we have in this sample. Then we will see the ratio of each element.

We are given the mass, so to convert it to moles we use the molar mass. For this we go to the periodic table and see that the values for each element are:

Na (sodium): 22,99 g/mol

H (hydrogen): 1 g/mol

P (phosphorus): 25,81 g/mol

So we calculate the moles of each element as follows:

And as we see, for every 0.833 moles of Na we have the same number of moles of P, so the ratio of these elements in the molecule is 1 to 1.

As for the hydrogen:

So the ratio Na to H is 1 to 2.

Now we can write the empirical formula as follows=

A calorimeter is an insulated container filled with a liquid, usually water. When a hot object is placed in the calorimeter, heat energy is transferred from the object to the water, and the water heats up. Calorimeters can be used to find a substance's specific heat capacity. Using the given data, we need to find the final temperature of copper and water. Let's look at the given data:

Mass of copper = 200 g

Mass of water = 200 g

Initial temperature of water = 30°C

Initial temperature of copper = 90°C

Now, we will use the energy conservation principle to find the final temperature of copper and water. According to the principle of energy conservation, the heat lost by the hot body equals the heat gained by the cold body.

Heat lost by copper = heat gained by water

Here, we know that water's specific heat capacity is greater than copper's. Hence, the heat water gains will be greater than copper's.

Let the final temperature of copper and water be Tc and Tw, respectively.

∆Tc = Tc - 90°C (Temperature change in copper)

∆Tw = Tw - 30°C (Temperature change in water)

Heat lost by copper = heat gained by water

mc∆Tc = mw∆Tw

Where mc = mass of copper, mw = mass of water, and c = specific heat capacity of the substance.

Mass of copper = 200 g

Mass of water = 200 g

Specific heat capacity of copper = 0.385 J/g °C

Specific heat capacity of water = 4.18 J/g °C∴ mc = 200 g, c = 0.385 J/g °C, mw = 200 g, and cw = 4.18 J/g °C

mc∆Tc = mw∆Tw

0.385 × 200 × (∆Tc) = 4.18 × 200 × (∆Tw)

0.385 (∆Tc) = 4.18 (∆Tw)

∆Tw = ∆Tc/0.0962...

Putting the value of ∆Tw in the above equation, we get:

0.385 (∆Tc) = 4.18 (∆Tc/0.0962...)0.385 (∆Tc) = 43.43 (∆Tc)∆Tc = 43.43/0.385 = 113.02°C∆Tw = ∆Tc/0.0962...= 113.02/0.0962...= 1173.81°C

We know that temperature cannot be negative. Hence, the final temperature of copper and water will be:

Final temperature of copper = 90 + ∆Tc= 90 + 113.02= 203.02°C

Final temperature of water = 30 + ∆Tw= 30 + 1173.81= 1203.81°C

Temperature change in copper = ∆Tc= 113.02°C

Temperature change in water = ∆Tw= 1173.81°C

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Answer:

Mesosphere

Stratosphere

Thermosphere

Troposphere

Exosphere

Explanation:

The exosphere refers to the farthest region of the atmosphere that gradually fades into space.

The troposphere is the lowest layer of atmosphere. It is the layer where weather changes occur.

The thermosphere is right above the mesosphere but just below the exosphere. It is the layer where photoionization/photodissociation of molecules occurs thereby creating ions. This largely owes to interaction of molecules in this layer with ultraviolet radiation.

The stratosphere is composed of gases. Prominent among them is ozone which serves as a blanket against the sun's ionizing radiation.

The mesosphere lies above the stratosphere but just below the thermosphere. Temperature decreases steadily with height in the mesosphere.

The 5 layers of the atmosphere are the troposphere, stratosphere, mesosphere, thermosphere, and exosphere.

The atmosphere has been consisted of the 5 layers that protect the earth. The layers have been present at the height that and each layer has consisted of different constituents.

The layers of the atmosphere can be described as:

The 5 layers of the atmosphere are the troposphere, stratosphere, mesosphere, thermosphere, and exosphere.

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When salt is dissolved in water, it dissociates into its constituent ions: positively charged sodium cations (Na+) and negatively charged chloride anions (Cl-).

The Na+ ions are surrounded by the negative side of encircling water molecules, which are polar molecules with a partial negative charge on the oxygen atom and a partial positive charge on the hydrogen atoms. This is because the Na+ ion is positively charged and is attracted to the negative side of the water molecules. On the other hand, the Cl- ions are surrounded by the positive side of encircling water molecules, as they are negatively charged and are attracted to the positive side of the water molecules.

Thus, both ions are fully hydrated in solution. This phenomenon is called solvation, where ions are surrounded by solvent molecules. Overall, the dissolution of salt in water results in the formation of a homogeneous solution due to the strong ion-dipole interactions between the ions and water molecules.

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The equivalents of h are present in a 0.25 m solution of hcl is 0.25 eq.

HCl is a strong electrolyte, which means it completely dissociates into its ions when dissolved in water. In this case, it dissociates into H⁺ and Cl⁻ ions. The term "equivalent" is used to express the amount of an ion in a solution. One equivalent of an ion is equal to the number of moles of that ion that can combine with or displace one mole of hydrogen ions (H⁺).

To determine the number of equivalents of H⁺ ions present in a 0.25 M solution of HCl, we first need to calculate the number of moles of HCl present in 1 liter of the solution:

0.25 M HCl = 0.25 moles of HCl per liter of solution

Since HCl dissociates into one H⁺ ion and one Cl⁻ ion, there are also 0.25 moles of H⁺ ions per liter of solution. To convert this to equivalents, we need to divide by the number of moles of H⁺ ions that can combine with or displace one mole of H⁺ ions, which is 1:

0.25 moles H⁺ ions / 1 mole H⁺ ions per equivalent = 0.25 equivalents of H⁺ ions per liter of solution

Therefore, by concluding we can say that the answer to the question is 0.25 eq.

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Above the line, the air is colder than 0°C. ... The freezing level is the height where the air is 0 degrees Celsius (0 °C) or 32 degrees Fahrenheit (32 °F). Higher than the freezing level, the air is colder. Lower than the freezing level, the air is warmer.

Answer:

ethylene(ethane) + oxygen → carbon dioxide + water

the type of reaction is COMBUSTION.

a) A control variable would be the same species of the rat that were used in the entire experiment.

b) A control group is the group of rat that do not have lymphoma.

What is control variable?

The control variable is a group which is unchanged or constant throughout the experiment. They may include temperature, humidity, pressure, experimental techniques, sample volume etc.

In an experiment control variable is the variable which must be kept constant throughout the experiment to keep the outcome of the experiment unaltered. The control group is the one that don't receive the treatment while being tested in an experiment.

Therefore, a control variable would be the same species of the rat used in the entire experiment and control variables are the one which do not have a lymphoma.

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Answer:

Pic attached of structures

Explanation:

a) Propanal       (R-CHO; Carbonyl grp structure)

b) Dimethyl ether or methoxymethane     (R-O-R)

Answer:

\(\boxed {\boxed {\sf 0.0014 \ mol \ Cu}}\)

Explanation:

We are asked to convert particles to moles.

1 mole of any substance contains the same number of particles (atoms, molecules, formula units). This is Avogadro's Number or 6.022*10²³.

In this problem, the particles are atoms of copper. So, 1 mole of copper contains 6.022*10²³ atoms of copper

Use Avogadro's Number to make a ratio.

\(\frac{ 1 \ mol \ Cu}{ 6.022*10^{23} \ atoms \ Cu}\)

We are trying to convert 8.3*10²⁰ atoms of copper to moles, so we multiply that value by the ratio.

\(8.3*10^{20} \ atoms \ Cu*\frac{ 1 \ mol \ Cu}{ 6.022*10^{23} \ atoms \ Cu}\)

The units of "atoms Cu" will cancel.

\(8.3*10^{20}\frac{ 1 \ mol \ Cu}{ 6.022*10^{23} }\)

Condense the expression into 1 fraction.

\(\frac{8.3 *10^{20}}{ 6.022*10^{23} } \ mol \ Cu\)

\(0.001378279641 \ mol \ Cu\)

The original measurement of atoms has 2 significant figures, so our answer must have the same. For the number we calculated that is the ten-thousandths place.

The 7 in the hundredth thousandth place tells us to round the 3 up to a 4.

\(0.0014 \ mol \ Cu\)

8.3*10²⁰ atoms of copper are equal to 0.0014 moles of copper.

Answer:

(1) Acid -------------------------------------> (G) When dissolved in water, its solution has a pH value less than 7. Acids are proton (H⁺ ion) donors.

(2) Alkali -----------------------------------> (E) The oxide, hydroxide, or carbonate of a metal that will react with an acid, forming a salt as one of the products (if a base dissolves in water it is called an alkali. Bases are proton (H⁺ ion) acceptors.

(3) Base ------------------------------------> (I) Its solution has a pH value of more than 7.

(4) Blast furnace ------------------------> (C) The huge reaction vessels used in industry to extract iron from its ore.

(5) Displacement reaction ----------> (R) A reaction in which a more reactive element takes the place of a less reactive element in one of its compounds or in solution.

(6) Mole -----------------------------------> (A) A very large number that is the amount of substance in the relative atomic or formula mass of a substance.

(7) Neutral -------------------------------> (J) A solution with a pH value of 7 which is neither acidic nor alkaline. Alternatively, something that carries no overall charge.

(8) Neutralization ----------------------> (F) The chemical reaction of an acid with a base in which a salt and water are formed. If the base is a carbonate of hydrogen carbonate, carbon dioxide is also produced in the reaction.

(9) Ore -------------------------------------> (P) Ore is rock which contains enough metal to make it economically worthwhile to extract the metal.

(10) Oxidation --------------------------> (B) A reaction where oxygen is added to a substance / or when electrons are lost from a substance.

(11) pH -------------------------------------> (O) A number which shows how strongly acidic or alkaline a solution is.

(12) Pipette ------------------------------> (N) A glass tube used to measure accurate volumes of liquids.

(13) Precipitate -------------------------> (K) An insoluble solid formed by a reaction taking place in solution.

(14) Reactant ---------------------------> (M) A substance we start with before a chemical reaction takes place.

(15) Reduction -------------------------> (S) A reaction in which oxygen is removed or electrons are gained.

(16) Salt ----------------------------------> (Q) A salt is a compound formed when some or all of the hydrogen in an acid is replaced by a metal.

(17) Strong acids ---------------------> (L) These acids completely ionize in solution and have a high concentration of H⁺ (aq) ions in solution.

(18) Universal indicator ------------> (H) A mixture of indicators that can change through a range of colors to show how strongly acidic or alkaline liquids and solutions are.

(19) Weak acids ---------------------->  (D) Acids that do not ionize completely in aqueous solutions.

The right response is d. Both enzymes will have the same ΔG for catalysis.

The reaction rate and equilibrium constant have an impact on the Gibbs free energy (ΔG). No matter the source of the enzyme, such as E. coli or a thermophilic microbe, the ΔG for a reaction is the same. As a result, both enzymes will have the same ΔG for sucrose hydrolysis.

The ΔG may be written mathematically as:

ΔG = -RT ln (K)

T is the temperature, K is the equilibrium constant, and R is the gas constant..

As both enzymes have the same reaction rate (K) and temperature (T), the reaction's ΔG  value will likewise be the same.

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