Which of the following pairs will form an ionic bond?
o and o
Sr ans Se
N and F
As and Br
Ar and P​

The correct choice is A) −5Δ[Br−]/Δt. The rate expressed as Δ[Br2]/Δt is proportional to -5 times the rate of change of Br−.

In the given reaction 5Br−(aq) + BrO3−(aq) + 6H+(aq) → 3Br2(aq) + 3H2O(aq), the stoichiometric coefficients provide information about the relationship between the reactants and products. To determine the rate expressed as Δ[Br2]/Δt, we need to compare it with the rate of change of the other species.

Based on the balanced equation, for every 5 moles of Br− consumed, 3 moles of Br2 are produced. Therefore, the rate of change of Br−, Δ[Br−]/Δt, is related to the rate of change of Br2, Δ[Br2]/Δt, by a factor of -5/3.

The other choices, B) −0.6Δ[Br−]/Δt, C) 3Δ[BrO3−]/Δt, and D) −Δ[H2O]/Δt, do not correspond to the correct relationship based on the stoichiometric coefficients of the reaction. Therefore, the correct answer is A) −5Δ[Br−]/Δt.

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Answer:

Nitrogen gas (N2) should have the lowest boiling point among the given options. This is because N2 is a nonpolar molecule with weak London dispersion forces between its molecules, which results in a relatively low boiling point. Sodium sulfide (Na2S) is an ionic compound, so it has a very high boiling point due to strong electrostatic forces between its ions. Ammonia (NH3) and hydrogen fluoride (HF) are polar molecules that can form hydrogen bonds between their molecules, which results in higher boiling points than N2.

Explanation:

Nitrogen gas (N2) should have the lowest boiling point among the given options. This is because N2 is a nonpolar molecule with weak London dispersion forces between its molecules, which results in a relatively low boiling point. Sodium sulfide (Na2S) is an ionic compound, so it has a very high boiling point due to strong electrostatic forces between its ions. Ammonia (NH3) and hydrogen fluoride (HF) are polar molecules that can form hydrogen bonds between their molecules, which results in higher boiling points than N2.

Answer:

Yes

Explanation:

You can have 2s and have part of the 2p of the row in the p section.

Answer:

The correct option is (d).

Explanation:

It is given that,

1$ = 1500 pesos

We need to convert 360 pesos into dimes

We can convert 360 pesos to dollars as follows:

\(360\ \text{pesos}=\$\dfrac{1}{1500}\times 360\\\\=$0.24\)

360 pesos is equal to $0.24

Also, 1 dollar = 10 dimes

We can covert 0.24 dollar to dimes as follows :

0.24 dollar = 10 × 0.24 dimes

0.24 dollar = 2.4 dimes

or

360 pesos = 2.4 dimes

There must have been 0.10mol of \(C_{2} H_{2} O\) in the container at the beginning.

 \(C_{2} H_{2} O\) + \(2O_{2}\) = \(2CO_{2}\) + \(H_{2} O\)

The above reaction makes it quite evident that 1 mol of \(C_{2} H_{2} O\) combines to create 2 mol of \(CO_{2}\) and \(O_{2}\) is given in excess that \(C_{2} H_{2} O\) alone controls a product's formation. Therefore, here, O is an excess reactant and \(C_{2} H_{2} O\) is a limiting reactant.

It takes 6 times as much \(C_{2} H_{2} O\) to produce 1 mol of \(CO_{2}\) from 0.05 mol of \(C_{2} H_{2} O\).

Now, 0.6 divided by 6 mol of reactant is required for 0.60 moles of \(CO_{2}\)to produce, which translates to

moles of \(C_{2} H_{2} O\) = 0.6/6 = 0.1 mol .

Therefore, \(C_{2} H_{2} O\) must have been present in the container in an initial concentration of 0.10mol.

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Answer: The percent yield for the \(NaBr\) is, 86.7 %

Explanation : Given,

Moles of \(FeBr_3\) = 2.36 mol

Moles of \(NaBr\) = 6.14 mol

First we have to calculate the moles of \(NaBr\)

The balanced chemical equation is:

\(2FeBr_3+3Na_2S\rightarrow Fe_2S_3+6NaBr\)

From the reaction, we conclude that

As, 2 moles of \(FeBr_3\) react to give 6 moles of \(NaBr\)

So, 2.36 moles of \(FeBr_3\) react to give \(\frac{6}{2}\times 2.36=7.08\) mole of \(NaBr\)

Now we have to calculate the percent yield for the \(NaBr\).

\(\text{Percent yield}=\frac{\text{Experimental yield}}{\text{Theoretical yield}}\times 100\)

Experimental yield = 6.14 moles

Theoretical yield = 7.08 moles

Now put all the given values in this formula, we get:

\(\text{Percent yield}=\frac{6.14mol}{7.08mol}\times 100=86.7\%\)

Therefore, the percent yield for the \(NaBr\) is, 86.7 %

Answer:

The principle that allows the enthalpy of a reaction to be determined indirectly from several steps is called Hess's Law.

Explanation:

Hess's Law states that the enthalpy change of a chemical reaction is independent of the pathway between the initial and final states, as long as the initial and final conditions are the same.

This means that the overall enthalpy change for a reaction can be calculated by adding or subtracting the enthalpy changes for a series of simpler reactions that add up to the overall reaction.

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Without the specific redox reaction, we cannot determine the element being oxidized.

In the given redox reaction, we need to determine which element is being oxidized. To do this, we compare the oxidation states of the elements before and after the reaction.

Unfortunately, the specific redox reaction is not provided in the question. Without the reaction, we cannot determine the element being oxidized. Please provide the specific redox reaction so that we can analyze it and identify the element being oxidized.

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Avocados and tomatoes were mainly eaten by the Aztecs and Maya.

"Mayans cooking method includes digging a shallow pit, lining it with stones or clay balls.

Avocados and tomatoes were mainly eaten by the Aztecs and Maya, with different types of fruit. Corn was made into a kind of porridge, called atole in Mesoamerica and capita in Inca territory.

Avocados and tomatoes were mainly eaten by the Aztecs and Maya.

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Answer:

C. single replacement

Explanation:

In a single replacement reaction, one atom replaces another.

The general form of a single replacement reaction is: A + Bc ⇒ Ac + B

A   +  B  ×  c      ⇒   B   +  A × c

↓       ↓      ↓            ↓       ↓    ↓

Fe +  Pb(NO₃)₂ ⇒  Pb  + Fe(NO₃)₂

Iron switched places with lead so the reaction is a single replacement reaction.

Hope this helps.

Definition: Fluid that can act as a liquid or as a solid depending on the pressure applied on it.

Explanation:

A fluid that incorporates time in a solid and liquid model is a non-Newtonian fluid. This type of fluid can behave as a solid or as a liquid depending on the pressure that is applied on it. This is different from normal fluids that remain the same regardless of the pressure they are subjected to. In the case of non-Newtonian fluids, when submitted to pressure, they are presented as solids, but without pressure, they are presented as liquids. This feature can be seen even within the same system.

The radius of a barium atom is 2.68 Å.

Barium is a chemical element that is silvery-white in color and can be found in the periodic table with the symbol Ba.

The density of barium is 3.51 g/cm3, and it has a body-centered cubic unit cell that crystallizes.

Determine the length of the edge of the unit cell. Since barium has a body-centered cubic unit cell, the length of the edge of the unit cell:

Edge length = 4r /√3

Where r is the radius of the atom.

The volume of the unit cell using the formula:

Volume of unit cell = Edge length³

The number of atoms present in the unit cell. Since barium has a body-centered cubic unit cell, the number of atoms present in the unit cell :

Number of atoms in the unit cell = 2

The mass of a single atom of barium using the formula:

Mass of a single atom = Density of barium / Avogadro’s number

Where Avogadro’s number is 6.02 × 10²³ atoms/mol.

The radius of a barium atom using the formula:

Radius of barium atom = (3 × volume of unit cell / 4 × π × number of atoms in the unit cell)¹/³

The radius of the barium atom :

Edge length = 2r√3

r = (Edge length) / 2√3

Volume of the unit cell = (Edge length)³

Number of atoms in the unit cell = 2

Mass of a single atom = Density of barium / Avogadro’s number

Radius of barium atom = (3 × volume of unit cell / 4 × π × number of atoms in the unit cell)¹/³

Therefore, the radius of a barium atom is 2.68 Å.

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Answer:

A lot

Explanation:

- As you go down a group, the elements get larger in size

- All of the elements of the same group have the same # of valence electrons

- As you go to the right of a period, the # of electrons in the outermost shell increases

- The elements at the top right of the table have the highest electronegativity

- Groups 13 through 17 are nonmetals

- The last group contains noble gases

etc.

\(HELLO!\)

To completely describe an electron in an atom, four quantum numbers are needed:

                                          \(MiraculousAlejandra\).

The concept is to provide diagnostic images using the optimal amount of radiation. If the index is too low, it may indicate poor image quality. If the dose index is too high, it may mean using more radiation than is needed for imaging.

There are three kinds of index numbers, namely:

a. Price index figures, namely comparative figures to measure price changes from one period to another.

b. Number index (quantity), which is a comparison number to measure changes in the amount from one period to another.

c. Value index number, which is a comparison number to measure changes in value from one period to another. Value is calculated by multiplying the price by the amount (quantity).

Your question is incomplete but most probably your full question was:

Explain. What is the Index Value for an exposure of low?

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Answer:

Explanation: The number of atoms is an exact number, the number of mole is an exact number; they do not affect the number of significant figures. The average mass of one mole of H2O is 18.02 grams. This is stated: the molar mass of water is 18.02 g/mol.

Answer:

A reaction at equilibrium implies that the concentration/amount of reactants & products present in that reaction don't change but will remain constant. It could also mean that the forward reactions and reverse reactions will occur at the same rates.

Explanation:

A reaction at equilibrium implies that the concentration/amount of reactants & products present in that reaction don't change but will remain constant. It could also mean that the forward reactions and reverse reactions will occur at the same rates.

The molecular formula of the unknown compound is C2H2O2.

To determine the molecular formula of the unknown compound, we need to calculate the empirical formula first and then find the multiple of its subscripts to obtain the molecular formula.

Given:

Percentage of carbon = 40.0%

Percentage of hydrogen = 6.7%

Percentage of oxygen = 53.3%

Molecular mass = 60.0 g/mol

Step 1: Convert the percentages to grams.

Assuming we have 100 grams of the compound:

Mass of carbon = 40.0 g

Mass of hydrogen = 6.7 g

Mass of oxygen = 53.3 g

Step 2: Convert the masses to moles using the molar masses of the elements.

Molar mass of carbon = 12.01 g/mol

Molar mass of hydrogen = 1.008 g/mol

Molar mass of oxygen = 16.00 g/mol

Number of moles of carbon = Mass of carbon / Molar mass of carbon

= 40.0 g / 12.01 g/mol

= 3.332 mol

Number of moles of hydrogen = Mass of hydrogen / Molar mass of hydrogen

= 6.7 g / 1.008 g/mol

= 6.648 mol

Number of moles of oxygen = Mass of oxygen / Molar mass of oxygen

= 53.3 g / 16.00 g/mol

= 3.331 mol

Step 3: Determine the empirical formula by dividing the moles by the smallest value.

Dividing the moles of carbon, hydrogen, and oxygen by 3.331 gives approximately 1 for each element.

So, the empirical formula of the compound is CHO.

Step 4: Determine the multiple of the subscripts to obtain the molecular formula.

To find the multiple, we divide the molecular mass by the empirical formula mass.

Molecular mass = 60.0 g/mol

Empirical formula mass = (12.01 g/mol) + (1.008 g/mol) + (16.00 g/mol) = 29.018 g/mol

Multiple = Molecular mass / Empirical formula mass

= 60.0 g/mol / 29.018 g/mol

= 2.07

Rounding to the nearest whole number, we get 2.

Therefore, the molecular formula of the unknown compound is C2H2O2.

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The colorimetric determination of cobalt with dimethylglyoxime and benzidine is a method used to quantify the concentration of cobalt ions in a solution based on the formation of a colored complex.

Dimethylglyoxime (DMG) and benzidine are reagents that react with cobalt ions to form a red-colored complex. The intensity of the color is directly proportional to the concentration of cobalt ions present in the solution.

The procedure involves adding DMG and benzidine reagents to the solution containing cobalt ions. The cobalt ions react with DMG and benzidine to form the red complex. The absorbance of the colored complex is then measured using a spectrophotometer at a specific wavelength.

To determine the concentration of cobalt, a calibration curve is prepared using known concentrations of cobalt solutions. The absorbance values of the solutions are measured, and a linear relationship between absorbance and concentration is established.

By measuring the absorbance of the unknown cobalt solution and using the calibration curve, the concentration of cobalt can be determined.

The colorimetric determination of cobalt with dimethylglyoxime and benzidine provides a quantitative method to measure the concentration of cobalt ions in a solution. The formation of a red-colored complex allows for the measurement of absorbance, which is directly related to the concentration of cobalt. This method is useful in various applications, such as environmental analysis, industrial processes, and research involving cobalt-containing compounds.

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Answer:

30

Explanation:

A mass number indicates the total number of protons and neutrons. An element is defined by its number of protons, however neutrons can vary (this is what causes isotopes). By definition, iron (Fe) has 26 protons. Since the mass number is the number of protons + the number of neutrons, the number of neutrons is the mass number - the number of protons, in this case 56-26=30

A Fe2+ ion has a positive charge (but its number of protons can't change without it becoming a different element) so since each proton is +1 to charge and each election is -1, to get a +2 charge, there must be 2 more protons than electrons, so a Fe2+ ion has 24 electrons, but this does not affect the mass number or the number of protons.

Answer:

30

Explanation:

edge2023

Answer:

The water supply is not safe.

Explanation:

Ionically, the reaction is;

Pb^2+(aq) + 2Br^-(aq) -------> PbBr2(s)

Amount of Br^- reacted = 2/1000 * 0.12 = 2.4 * 10^-4 moles

From the reaction equation;

1 mole of Pb^2+ requires 2 moles of Br^- for complete precipitation

x moles of Pb^2+ requires 2.4 * 10^-4 moles of Br^-

x = 1 * 2.4 * 10^-4 /2

x = 1.2 * 10^-4 moles of Pb^2+

Concentration of Pb^2+ precipitated from 5ml of tap water =  1.2 * 10^-4 * 1000/5

Concentration = 2.4 * 10^-2 M

The amount of  Pb^2+ found in the water is greater than the maximum allowable concentration of Pb2+ ions in water in a local community which is 1.51 x 10-8 M. Therefore, the water supply is not safe.

Answer:

c, driving a car

Explanation:

got it right :)

have a nice day!~

In the given redox reaction, the element which is the reducing agent is silver as it is getting oxidized from zero to +1 by the gain of an electron.

Redox reactions comprise of two parts a reduced part and an oxidized part, which occur simultaneously . The part which is reduced gain electrons and hence there is a increase in oxidation state of the species.

While, the part which is oxidized looses electrons and hence there is a decrease in oxidation state of the species.During redox reactions, there is no net change in the number of electrons . Electrons which are given off in oxidation are used up in reduction.

The ion or molecule which accepts electrons is called as oxidizing agent while the ion or molecule which donates electrons is called as a reducing agent.

In the given equation silver is getting oxidized thus acting as a reducing agent.Thus, option B is correct.

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Answer:

2

Explanation:

Because there are two atoms of each of the reactants (left of arrow,) therefore making the product, NaCl, or Sodium Chlorite, have two atoms.

The murder took place approximately 851.2 years ago.

Based on the isotope's half-life, we must determine the age of the remains.

90% of the normal amount being present in the remains means that 0.90 of the isotope is still present.

The equation for radioactive decay can be used:

fraction remaining =\((1/2)^(^n^/^t^)\)

Where

We can rearrange the formula to solve for the number of half-lives (n):

n = (log base 0.5) (fraction remaining)

Using the given fraction remaining of 0.90:

n = (log base 0.5) (0.90)

n ≈ 0.152

Since the number of half-lives is a fraction, we can convert it to years by multiplying it by the half-life:

time elapsed = n * t

time elapsed ≈ 0.152 * 5600 years

time elapsed ≈ 851.2 years

So, the murder took place approximately 851.2 years ago.

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Answer:

In the nucleus

Explanation:

Answer:

3 you use elements instead of numbers and arrows instead of equal signs

actually it would be more like word problems you have 4 apples plus 3 oranges yields 7 apple orange things but it doesn't yield 7 of them it would be an equal ratio of moles of the fruits

4 the arrow is an equal sign

Explanation:

Answer:

The RMM of Ca (OH)2 is

40+ (16+1)2

40+(17)2

40+34

74

The RMM of Al2SO4 is

(27×2)+32+(16×4)

54+32+64

=150

Explanation:

Note that the RAM of:

Ca=40

O=16

H=1

Al=27

S=32

Answer:

74.99g

Explanation:

Mass of a substance can be calculated by using the formula;

mole = mass ÷ molar mass

mass = molar mass × mole

According to this question, 37.2 moles of hydrogen gas is given.

Molar mass of hydrogen gas (H2) = 1.008(2) = 2.016g/mol

mass = 2.016 × 37.2

Mass of H2 = 74.995

Mass = 74.99g

The correct answer is (b). The following word equation best represents this reaction: sulfur + oxygen → sulfur dioxide.

Sulfur dioxide (SO2) is produced when sulfur is burned in oxygen. The chemical reaction that occurs is:

S(s) + O2(g) → SO2(g)

This equation represents the burning of sulfur to produce sulfur dioxide in the presence of oxygen. Sulfur, when burned in the presence of oxygen, produces sulfur dioxide. In this chemical reaction, sulfur (S) reacts with oxygen (O2) to form sulfur dioxide (SO2). The reaction is exothermic, which means that it releases heat.

Sulfur dioxide is a major air pollutant and has significant impacts on human health. However, it also has immense importance in laboratories. It is used for the manufacture of sulphuric acid and is also used as a preservative.

In summary, the correct option is B, which is sulfur + oxygen → sulfur dioxide.

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The correct word equation that represents the production of sulfur dioxide from the burning of sulfur in the presence of oxygen is **option b**: sulfur + oxygen → sulfur dioxide.

When sulfur is burned in the presence of oxygen, it undergoes a chemical reaction known as combustion. During this process, sulfur reacts with oxygen to form sulfur dioxide. The equation can be balanced as follows:

\(Sulfur (S) + Oxygen (O2) → Sulfur Dioxide (SO2)\)

In this equation, sulfur and oxygen are the reactants, while sulfur dioxide is the product. It is important to note that the coefficients (numbers in front of the chemical formulas) should be adjusted to balance the equation, ensuring that the number of atoms on both sides is equal.

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