What is the value of the rydberg constant for hydrogen, in units of joules?.

Answer:

22.5 mg

Explanation:

36 hrs / 9 hr/half life = 4 half lives

(1/2)^4   * 360 = 22.5 mg

Answer:

A chemical bond formed when two atoms share two pairs of electrons is a double bond; it is best described as a covalent bond.

Explanation:

A chemical bond in which two pairs of electrons are shared has to be defined as covalent since ionic bonds don't involve electron sharing. They consist only of electrostatic attraction between ions.

The number of moles of oxygen in 7.2 moles of H₂S0₄ is 28.8 moles of oxygen. The amount of substance that contain total elementary entities is called as mole.

The International System of Units uses the mole as the unit of material quantity. How many elementary entities of a certain substance are present in an item or sample is determined by the quantity of that material.

The term "mole" refers to the volume of a material containing the same number of atoms, molecules, or ions as there are in 12 grams of the carbon-12 isotope. A group of identical or dissimilar atoms that are capable of existing independently is referred to as a molecule.

In sulfuric acid, there are 4 molecules of oxygen present,

7.2 × 4 = 28.8 moles.

Thus, The number of moles of oxygen in 7.2 moles of H₂S0₄ is 28.8 moles of oxygen.

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Answer:

I would say you are correct.

Explanation:

Answer:

I believe it'll be A (even though you chose it already).

Explanation:

Lanthanides may block the opening of stretch-activated ion channels, which can have significant effects on various physiological processes. Further research is needed to fully understand the mechanism of action and potential implications for human health.

Lanthanides are a group of metallic elements in the periodic table that are commonly referred to as rare earth elements. These elements have unique chemical and physical properties that make them useful in a variety of applications, including electronics, magnets, and catalysts.

Recent studies have suggested that lanthanides may also have an effect on stretch-activated ion channels, which are important in regulating the flow of ions across cell membranes. These channels are involved in a variety of physiological processes, including muscle contraction, nerve signaling, and the regulation of blood pressure.

When a stretch-activated ion channel is activated, it opens to allow the flow of ions across the cell membrane. This influx of ions can trigger a variety of downstream effects, including changes in cell shape, gene expression, and signaling pathways. However, if the channel is blocked, it cannot open, and the flow of ions is prevented.

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Answer:

the day where the daylight and night are equal in the Spring

The temperature of the filament, in degrees Celsius  when the bulb is on the filament is made of tungsten is 2500 °C - 3000 °C.

The material used as filament is tungsten . the limit of working temperature of tungsten is 2500 °C - 3000 °C. The tungsten used as a filament in blub because it is an alloy. tungsten have high melting point. tungsten does not burn at room temperature because of high resistivity , it glows the bulb at high temperature.

Thus, The temperature of the filament, in degrees Celsius  when the bulb is on the filament is made of tungsten is 2500 °C  - The3000 °C.

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The bonding in HNNH is Sp² orbitals on each nitrogen overlap and form a sigma bond

To verify the accuracy of any chemical structure, we use the octet rule, which states that all atoms in a compound are expected to abide by. In the model of carbon IV oxide, every atom precisely satisfies the octet rule. Each atom in the molecule has eight electrons surrounding its valence shell. Given the total number of bonds and electrons, as well as the fact that CO2 has sixteen valence electrons, we can therefore conclude that this structure is correct.

It has a negative charge that is comparable to its negative charge, which is 1.602176634 coulombs, the fundamental unit of electric charge. Only 1/1,836 the mass of a proton, or 9.1093837015 10-31 kg, makes up the rest mass of an electron.

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The Concentration is 0.19 mol/L i.e., also known as molarity which is calculated below.

Step 1: Calculation of molarity

Molarity is  defined to be the number of moles of solute divided by volume of solution in liters

i.e.,    Molarity(M)= number of moles of solute / volume of solution ( in L )

Step 2: Calculate the moles  of KMnO4

Given,

Mass = 5.9 g

Molar mass of KMnO4 = 158.034 g/mol

we know,  moles = mass / molar mass

moles of KMnO4  = 5.9 g / 158.034 g/mol = 0.037334 mol

Step 3: Calculation of molarity

Volume of solution = 200 mL = 0.200 L  

[ because 1 L=1000 mL   so, 200 mL = ( 200 mL  ×  ( 1 L / 1000 mL) = 0.200 L ]

Since we know ,

molarity = moles of solute / volume of solution in L

molarity = 0.037334 mol /0.200 L = 0.19 mol/L        

Hence, the Concentration is 0.19 mol/L    

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Complete question:          

A Chemist Prepares A Solution Of Potassium Permanganate (KMnO4) By Measuring Out 5.9 G Of Potassium Permanganate Into A 200 ML Volumetric Flask And Filling The Flask To The Mark With Water. Calculate The Concentration In Mol/L Of The Chemist's Potassium Permanganate Solution. Round Your Answer To 2 Significant Digits.

option (B) KOH is the correct answer

KOH is the substance that, when added to the solution, is most likely to raise the pH .

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Answer:

if its 5X 10^3 mm=5m and if its 5X 10^-3 mm=5X 10^-6m

Explanation:

we know,

1m= 1000mm

as given 5X 10^3 mm we have to convert to meter

now  5X 10^3 mm= 5X 10^3/1000=5m

but if its  5X 10^-3 mm= 5X 10^-3/1000= 5X 10^-6m

thank u,

Answer:

Mixing chemicals can be dangerous because you are handling chemicals that are often hazardous.*

Always wear the correct personal protective clothing and equipment when mixing chemicals.

Follow these steps to mix chemicals safely:

Choose a suitable mixing area. The site should be away from plants, people, animals and waterways. It needs to have good lighting and must be well ventilated. There should be first aid equipment and materials to clean up any spills that may occur. Make sure you have lots of clean, fresh water available. The water that you are using in your mixture should be as clean as possible.

Check the product label for the chemical to find out how to mix a solution, including the proportions or volumes needed. If you are unsure, contact the manufacturer or retailer for instructions. I hope it helps. Be safe.

Answer:

I can't get you what you are telling

The reaction order (m) is 1, and the rate constant (k) is approximately 1.34 for the decomposition of N₂O₅ in carbon tetrachloride at the specified temperature.

To determine the reaction order and rate constant for the decomposition of dinitrogen pentoxide (N₂O₅) in carbon tetrachloride solvent at a certain temperature, we need to use the given data points.

The general rate equation for a reaction can be written as:

Rate = k[N₂O₅]^m

Where:

Rate is the rate of the reaction,

k is the rate constant,

[N₂O₅] is the concentration of N₂O₅, and

m is the reaction order with respect to N₂O₅.

The given data points to determine the reaction order and rate constant:

[N₂O₅] Rate

0.92 1.23

1.23 1.79

1.79 2.00

2.00 2.21

2.21

To determine the reaction order (m), we can examine the ratio of rate values for two different concentrations of N₂O₅:

(1.79/1.23) = (2.00/1.79) = (2.21/2.00) = 1.46

Since the ratio of rate values is approximately constant at 1.46, it indicates that the reaction is first-order with respect to N₂O₅. Therefore, m = 1.

Now, we can use any of the data points to calculate the rate constant (k). Let's use the first data point ([N₂O₅] = 0.92 and Rate = 1.23) and plug the values into the rate equation:

1.23 = k(0.92^1)

Simplifying:

k = 1.23 / 0.92

k ≈ 1.34

Therefore, the reaction order (m) is 1, and the rate constant (k) is approximately 1.34 for the decomposition of N₂O₅ in carbon tetrachloride at the specified temperature.

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Answer:

80.07 g/mol

Explanation:

Sulfur's g/mol = 32.07

Oxygen's g/mol = 16.00

32.07 + 16.00(3) = 80.07 g/mol

Answer:

80.07 g/mol

Explanation:

The concentration of the new solution after adding water to the solution until it reaches 1 L, is 0.1701 M.

A solution is a homogenous mixture of two or more compounds in chemistry. The substance that is present in the largest amount is called the solvent, and the substances that are dissolved in the solvent are called solutes. The solutes can be solids, liquids, or gases, and they can be in different physical states from the solvent.

When we add water to a solution, the amount of solute (in moles) remains the same, but the volume of the solution increases. Consequently, the following formula can be used to determine the new concentration of the solution:

C1V1 = C2V2

where C1 and V1 represent the solution's starting concentration and volume, and C2 and V2 represent the solution's final concentration and volume.

Substituting the values we know, we get:

(0.27 M)(630 mL) = C2(1000 mL)

Solving for C2, we get:

C2 = (0.27 M)(630 mL) / (1000 mL) = 0.1701 M

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Explanation:

I don't think a decomposer and detritvore would compete with each other because decomposers job is to break down dead, organic materials and detritvores feed on dead organisms

The density of a piece of wood measures 4. 5 cm X 9. 5 cm X 8. 0 cm, and it has a mass of 154 grams is 0.45 g/cm³.

density is the mass of a material substance per unit volume. d = M/V, where d is density, M is mass, and V is volume, is the formula for density. Grams per cubic centimetre are a typical unit of measurement for density.

For instance, whereas Earth has a density of 5.51 grammes per cubic centimetre, water has a density of 1 grammes per cubic centimetre.

Particle density is most commonly represented as n and refers to the quantity of particles per unit volume rather than the density of a single particle.

We have the density formula as,

density = mass/volume

where m is mass and v is volume,

Here we do not have the volume given, however we can calculate volume by multiplying given dimensions:

V = 4.5 x 9.5 x 8.0 = 342 cm³.

Density = 154/342

= 0.45 g/cm³.

Therefore, the density is  0.45 g/cm³.

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Answer:

pH = 12.6

Explanation:

The HF reacts with LiOH as follows:

HF + LiOH → LiF + H₂O

To solve this question we need to find the moles of each reactant:

Moles HF:

0.1500L * (0.20mol / L) = 0.030 moles HF

Moles LiOH:

0.600L * (0.10mol / L) = 0.060 moles LiOH

That means there is an amount of LiOH in excess, that is:

0.060 mol - 0.030 mol = 0.030 moles LiOH

In 600.0mL + 150.0mL = 750.0mL = 0.750L

The molarity of LiOH is:

0.030 moles LiOH / 0.750L =

0.040M LiOH = [OH⁻]

As:

Kw = 1x10⁻¹⁴ = [H⁺] [OH⁻]

1x10⁻¹⁴ = [H⁺] [0.040M]

2.5x10⁻¹³M = [H⁺]

As pH = -log [H⁺]

A temperature of -280°C is impossible because it is below absolute zero which is the lowest possible temperature that can be reached.

Absolute zero is defined as -273.15°C or 0 Kelvin.

Answer:

c. object y is made of a different substance than x and z

Explanation:

why well i did the study island and it told me the answer why so don't ask

Answer:

Ionic bonding happens when an atom of an element gives one or more of its electrons to the other element's atom..it usually takes place between metal and non metal atoms...like in NaCl, Na gives its valence electron to chlorine and completes its own octet. Chlorine accepts the electron and completes its own octet too...but now both the atoms have an opposing charge and hence they attract each other to form an IONIC bond.

Ionic bonds are the strongest of the bonds...here complete transfer of electrons takes place unlike covalent bonds.

HOPE IT HELPED..

:)

Answer:

The electrostatic interaction between an anion and cation

The final temperature of solid sodium hydroxide dissolves in water is 355.88 kelvin.

A given amount of matter's heat capacity is the amount of energy needed to raise its temperature by one degree Celsius. While the heat capacity of 1 mole of a substance is known as its molar heat capacity, the heat capacity of 1 gram of a substance is referred to as its specific heat capacity (or specific heat). The equation q = mcT, where m is the mass of the sample, c is the specific heat, and T is the temperature change, can be used to determine how much heat is gained or lost by a sample (q).

Given

Mass of NaOH = 13.9 g

Mass of water = 250 gram

Specific heat of the solution = 4.18 j/g·k

Initial temperature  = 23.0 °c or 296 kelvin

Heat evolved in process = −44.4 kj/mol

Q = mc (T₂ - T₁)

−44400 j/mol = 263.9 x 4.18 j/g·k x (T₂ - 296k)

T₂ = 355.88 k

Hence, final temperature of NaOH solution is 355.88 kelvin.

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Answer:

9.34 g Ag

Explanation:

Answer:

c20 will be there ok

Explanation:

okbbbbbbbbbbyyyyyyyy

A solution is defined as a mixture of two or more substances, usually, a solute and a solvent, and the difference between these two are in quantity, solute represents the smallest amount and solvent will represent the highest amount, and while you can have more than one solute, you can only have one solvent for a solution. Therefore the statement is true

Answer:

Ammonium nitrate is NH4NO3

iron(II) sulfate is FeSO4

magnesium hydroxide is MG(OH)2

titanium(II) chloride is TiCI2

cobalt(III) oxide is Co2O3

potassium sulfide is K2S

Barium acetate is C4H6BaO4

magnesium bromide is MgBr2

lithium carbonate is Li2CO3

potassium permanganate is KMnO4

Answer:

an atom

Explanation:

atoms make up everything in the universe!