why do you have to use parentheses when there is more than one of the polyatomic ions when an ionic compound forms?

Answers

Answer 1
So then it will be easier for you to understand how many of the polyatomic ions you have in that compound.

For example, Ca(NO2)2: in here Ca has a charge of +2 and NO2 has -1, you need two of NO2 in order to make the compound have a charge of 0.

Related Questions

why spectral lines of the hydrogen atom are split by an external magnetic field. what determines the number and spacing of these lines?

Answers

The spectral lines of the hydrogen atom are split by an external magnetic field due to a phenomenon called the Zeeman effect.


This effect occurs because the magnetic field causes the energy levels of the hydrogen atom to split, resulting in multiple energy levels that were previously degenerate becoming distinct.The number and spacing of these lines are determined by the magnitude of the external magnetic field and the quantum numbers associated with the energy levels of the hydrogen atomThe lines are separated by the energy difference between the split energy levels, which is proportional to the strength of the magnetic field.The number of lines is determined by the value of the total angular momentum quantum number, or the spin quantum number, associated with the electron. learn more about Zeeman here :


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How are moles and particles related? How could you find the number of particles in 4 moles of a substance?

Answers

Answer:

so in one mole of atom there are 6.02×10^23.

answers to B is 2.41×10^24

Explanation:

use this equation

number of particle=moles X 6.02×10^23

=4 X 6.02 ×10^23

=2.41×10^24

hope this make sense:)

The number of particles present in 4 moles of a substance is 24.088 particles.

What is moles?

Moles is a unit to express the amount of any substance and in one mole of any substance 6.022 × 10²³ particles of that substance are present and this number is known as Avogadro's number.

As in 1 mole = 6.022 × 10²³ particles are present

In 4 moles = 4 × 6.022 × 10²³ = 24.088 particles are present

Hence, 24.088 particles are present in 4 moles.

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how many atomic orbitals are needed to form one bonding molecular orbital and one anti-bonding molecular orbital? explain. the bonding of three incorrect: your answer is incorrect. atomic orbital(s) on two correct: your answer is correct. different atom(s) will give rise to one bonding molecular orbital and one anti-bonding molecular orbital

Answers

There are two molecular orbitals are needed to form one bonding molecular orbital and one anti-bonding molecular orbital.

Bond orbitals Electrons that spend most of their time between the nuclei of two atoms are placed in bonding orbitals, and electrons that spend most of their time outside the nuclei of two atoms are placed in anti-bonding orbitals.

Adding up the same number of atomic orbitals gives the same number of molecular orbitals. Two atomic orbitals combine to form two molecular orbitals. An anti-bonding orbital is essentially the opposite of a bonding orbital. They form when atomic orbitals combine in ways that lead to almost destructive interference.

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how does a allergy develop?


PLEASE HELP!

Answers

Allergies arise when a foreign material such as pollen, bee venom or pet dander responds to your immune system or a food that in most people does not cause a reaction. Substances known as antibodies are formed by your immune system.
how does a allergy develop?PLEASE HELP!

Answer: im not fully sure but from what i rememeber Allergies develop when your immune system mistakenly identifies a thing such as pollen, mold or food as harmful then your body reacts to it

Explanation:

A cup of coffee is made in the morning by pouring water ov er ground up coffee beans in a piece of paper and by collecting the brown liquid that comes through. Which techniques used

Answers

Answer: Filtration technique

Explanation:

The technique used here is called filtration.

Filtration,is a physical separation process that separates a mixture of an insoluble solid from a liquid ( acting as the solvent) by the use of a filter barrier that allows only the fluid to pass through.

In the case from the question,

As water is poured over the ground coffee, it forms a mixture of which the insoluble solid is the coffee grounds, the water is the liquid  and the filter barrier is the piece of paper  which allows only the brown  liquid coffee to pass through as the filtrate.

Can someone help I’m stuck on this question

Can someone help Im stuck on this question

Answers

Answer:

It is propyl amine.

as amine =H-N-H

and it contain 3C =prop

the theory that human beings are experiencing a period of rapid cultural diffusion and mixing of identities, values and other cultural forms is called

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The theory that human beings are experiencing a period of rapid cultural diffusion and mixing of identities, values, and other cultural forms is called cultural convergence.

What is Cultural convergence?

Cultural convergence refers to the theory that human beings are experiencing a period of rapid cultural diffusion and mixing of identities, values, and other cultural forms.

As a result of globalization, people all over the world are coming into contact with new cultures and ideas that were previously unavailable to them.

This has led to a blending of cultures and the emergence of new cultural forms that incorporate elements from different traditions.

Hence, The theory that human beings are experiencing a period of rapid cultural diffusion and mixing of identities, values, and other cultural forms is called cultural convergence.

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Determine the overall reaction and its standard cell potential at 25 �C for the reaction involving the galvanic cell made from a half-cell consisting of a silver electrode in 1 M silver nitrate solution and a half-cell consisting of a zinc electrode in 1 M zinc nitrate. Is the reaction spontaneous at standard conditions?

Answers

The reaction involved in the galvanic cell made from a half-cell consisting of a silver electrode in 1 M silver nitrate solution and a half-cell consisting of a zinc electrode in 1 M zinc nitrate is given as follows:2 Ag(s) + Zn2+ (aq) → Zn(s) + 2 Ag+ (aq)The standard cell potential at 25 °C for the given reaction can be determined using the following formula: E°cell

= E°cathode - E°anodeHere, the E°cathode and E°anode represent the standard reduction potentials of cathode and anode respectively. The values of these standard reduction potentials can be obtained from the standard reduction

potentials table.Using the values of standard reduction potentials from the table, we have:E°cell = E°Ag+ / Ag - E°Zn2+ / Zn= +0.80 V - (-0.76 V)= +1.56 VThe reaction is spontaneous at standard conditions because the calculated standard

cell potential is positive (+1.56 V). Therefore, the reaction will proceed spontaneously from left to right direction.The bolded non-consecutive keywords are: spontaneous, standard conditions, galvanic cell, reduction potentials.

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For molecules with only one central atom, how many lone pairs on the central atom guarantees molecular polarity?

Answers

Answer:

The answer is "1".

Explanation:

It is the lone pairs at, which the central atom provides the molecular and the polarity. It is only for substances with just a central atom, for which the molecules with only one central atom and only one of the solitary paired were required, that's why in this question the "1" is the correct answer.

Consider the following scenario: You are in charge of conducting an experiment for detecting the threshold to glucose in white wines. Considering that the threshold for sweetness from the literature is 0.01 M, indicate the sequence of concentrations steps (in ppm) that you need to prepare for the test? Molar mass for glucose = 180.156 g/mol

Answers

Concentration for threshold: 1801.56 ppm (0.01 M glucose). Half: 900.78 ppm. One-fourth: 450.39 ppm. One-eighth: 225.19 ppm. One-sixteenth: 112.60 ppm

How to indicate the sequence of concentrations steps (in ppm) that you need to prepare for the test

We should play out the total computation to decide the arrangement of concentration steps in ppm for identifying the sweetness to glucose in white wines.

Given:

Edge focus for pleasantness = 0.01 M

Molar mass of glucose (C6H12O6) = 180.156 g/mol

To switch the edge focus over completely to ppm, we want to compute the comparing fixation in grams per liter (g/L) and afterward convert it to ppm.

Convert the Threshold concentration to grams per liter (g/L):

Fixation (g/L) = Edge focus (M) * Molar mass (g/mol)

Focus (g/L) = 0.01 M * 180.156 g/mol

Convert the focus in grams per liter (g/L) to ppm:

ppm = Focus (g/L) * 10^6

Presently, we should compute the ppm values for the arrangement of concentration steps:

Stage 1: Threshold concentration = 0.01 M * 180.156 g/mol * 10^6 = 1801.56 ppm

Stage 2: Around 50% of the Threshold concentration = 900.78 ppm

Stage 3: One-fourth of the Threshold concentration = 450.39 ppm

Stage 4: One-eighth of  the Threshold concentration = 225.19 ppm

Stage 5: One-sixteenth of the threshold concentration = 112.60 ppm

Accordingly, the arrangement of concentration  steps in ppm to plan for the test is as per the following:

Stage 1: 1801.56 ppm

Stage 2: 900.78 ppm

Stage 3: 450.39 ppm

Stage 4: 225.19 ppm

Stage 5: 112.60 ppm

These concentration steps can be utilized in the analysis to assess the sweetness of glucose in white wines.

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The specific heat of the metallic element rhodium is 0. 240 j/g-k at 25°c. If 586 j of heat is added to an 80. 0 g block of rhodium metal that is initially at 25. 0°c, what is the expected final temperature of the block?.

Answers

The specific heat of the metallic element rhodium is 0. 240 j/g-k at 25°c. If 586 j of heat is added to an 80. 0 g block of rhodium metal that is initially at 25. 0°c,  the expected final temperature of the block 55.5 °C.

As we know

Q= mcΔT

Given values:

M= 80 g

C = 0.240 J/g K

Q= 586 J

To find final temperature

ΔT = 586 / 80 x 0.240 = 30.5 °C

Final temperature =25 + 30.5 = 55.5 °C

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Which model illustrates a compound A, b, c, d,

Which model illustrates a compound A, b, c, d,

Answers

Answer: C

Explanation: I have the same question, it’s for summit, my teacher helped me with this question :)

8. Draw the structural formula for isoprene (the building block of rubber). It should satisfy the molecular formula for isoprene of C5H8.

plz i need help ​

Answers

Here are two options use the one you need :)

8. Draw the structural formula for isoprene (the building block of rubber). It should satisfy the molecular
8. Draw the structural formula for isoprene (the building block of rubber). It should satisfy the molecular

which of these four elements is the most reactive metal?​

Answers

Answer:

Na

Explanation:

Answer:

It is Rb!!

for plato users

PLS HELP FAST 20 POINTS​

PLS HELP FAST 20 POINTS

Answers

Answer:

I am pretty sure that it is C

Explanation:

What are the basic principles of the Cyclical Model Theory? *


A-the universe had no begging nor will there be an end

B-the matter is created at the same rate of the expansion of the universe

C-do universe begin with the big bang from a singularity containing all the mass and energy of the universe

D- the universe begin with the big bang and end with a big corn sure of the universe expansion is reversed

What are the basic principles of the Cyclical Model Theory? *A-the universe had no begging nor will there

Answers

The basic principle of the Cyclical Model Theory is the universe begins with the big bang and ends with a big corn sure of the universe's expansion is reversed.

The correct option is D.

What is the cyclical model theory?

The Cyclical Model Theory proposes that the universe undergoes an infinite series of cycles, with each cycle, beginning with a "big bang" and ending with a "big crunch". After the big crunch, the universe undergoes a period of contraction until it becomes a singularity, which then expands again in another big bang, starting the cycle anew.

This theory assumes that the universe is eternal and that the cycle of birth, growth, decay, and rebirth repeats indefinitely.

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5. How many atoms are in 1.3 x 1022 molecules of NO2?

Answers

three atoms are in 1.3 X 1022 molecules of NO2

zinc is very essential element for human body, why? give reason.​

Answers

Answer: Function

Explanation: Zinc is found in cells throughout the body.

It is needed for the body's defensive (immune) system to properly work.

It plays a role in cell division, cell growth, wound healing, and the breakdown of carbohydrates.

A 800 kg car zooms away from a red light with an acceleration of 7.6 m/s2. What is the
average net force in Newtons that the car experiences?

Answers

Answer:

Fnet = 13920 Newtons

Explanation:

Net force can be defined as the vector sum of all the forces acting on a body or an object i.e the sum of all forces acting simultaneously on a body or an object.

Mathematically, net force is given by the formula;

\( Fnet = Fapp + Fg\)

Where;

Fnet is the net force Fapp is the applied forceFg is the force due to gravitation

Given the following data;

Mass, m = 800 kg

Acceleration, a = 7.6m/s²

To find the applied force;

\( Fapp = ma\)

Substituting into the equation, we have;

\( Fapp = 800 * 7.6\)

Fapp = 6080N

To find the gravitational force;

We know that acceleration due to gravity, g = 9.8m/s²

\( Fg = mg\)

Substituting into the equation;

\( Fg = 800 * 9.8\)

Fg = 7840N

To find the net force;

\( Fnet = Fapp + Fg\)

Substituting into the equation, we have;

\( Fnet = 6080N + 7840N\)

Fnet = 13920 Newton.

Therefore, the net force experienced is 13920 Newton.

In a chemical change, the original substance disappears:

Agree or Disagree?

Answers

Answer: it’s false

Explanation: In chemical changes the amount of particular substances may change but the total amount of materials does not. In chemical changes as in physical changes matter cannot disappear nor appear from nowhere. It can only react to form something else

In chemical changes the amount of particular substances may change but the total amount of materials does not. In chemical changes as in physical changes matter cannot disappear nor appear from nowhere. It can only react to form something else.

i have a good idea of the answer i just need confirmation! Thanks!

i have a good idea of the answer i just need confirmation! Thanks!

Answers

ANSWER

7 moles of MgO was produced during the reaction

EXPLNATION

Given that;

The number of moles of oxygen is 3.5 moles

Follow the steps below to find the number of moles of MgO

Step 1; Write a balanced equation of the reaction

\(\text{ 2Mg + O}_2\text{ }\rightarrow\text{ 2MgO}\)

In the equation above 2 moles Mg react with 1 mole oxygen to produce 2 moles MgO

Step 2; Find the number of moles of MgO using a stoichiometry ratio

Let x represents the number of moles of MgO

\(\begin{gathered} \text{ 1 mole O}_2\text{ }\rightarrow\text{ 2 moles MgO} \\ \text{ 3.5 moles O}_2\text{ }\rightarrow\text{ x moles MgO} \\ \text{ Cross multiply} \\ \text{ 1 mole O}_2\times\text{ x moles MgO = 2 moles MgO }\times\text{ 3.5moles O}_2 \\ \text{ Isolate x} \\ \text{ x moles MgO = }\frac{2\text{ moles MgO}\times3.5moles\cancel{O_2}}{1mole\cancel{O_2}} \\ \\ \text{ x moles MgO = 2 }\times\text{ 3.5} \\ \text{ x moles of MgO = 7 moles} \end{gathered}\)

Therefore, 7 moles of MgO was produced during the reaction

What is the answer of the ice cream activity of integration

Answers

The ice cream activity of integration is that it demonstrates how integration can be used to find the area under a curve or the total quantity of a certain variable, such as the amount of ice cream consumed.

This activity involves plotting the ice cream consumption over time on a graph, with the x-axis representing time and the y-axis representing the amount of ice cream consumed. The curve formed by the data points represents the rate of ice cream consumption.

The goal of this activity is to find the total amount of ice cream consumed during a specific time interval. To do this, you can use integration, which is a mathematical technique for finding the area under a curve.

By integrating the function that describes the curve, you can determine the total ice cream consumed during the given time period. This activity helps to illustrate the concept and application of integration in real-life situations.

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an atom of a mystery element contains 7 protons, 7 neutrons, and 7 electrons. what is the mass number?

Answers

The mass number of the mystery element is 14.

This is calculated by adding the number of protons and neutrons together, which in this case is 7 + 7 = 14.
The atomic mass number is the amount of protons and neutrons in an atom's nucleus. The atomic number of an element is the number of protons in its nucleus. As a result, the atomic number determines the chemical properties of an element.

The number of protons in an element's nucleus, which is the atomic number, remains the same for all atoms of the same element. On the other hand, the atomic mass of an element is the sum of the number of protons and neutrons in the nucleus of the atom.

Hence ,The atomic mass number of the mystery element with 7 protons, 7 neutrons, and 7 electrons is 14.

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What is the formula of a potassium ion?​

Answers

the answer is in the picture!

What is the formula of a potassium ion?

can you please help me with this

can you please help me with this

Answers

Explanation:

TUU-PQVH-MFG LINK for them who truely interested in Paranormal and have any doubt on Paranormal

1. Describe what happens to water particles as you increase/decrease the temperature/pressure? (hint: movement/speed, attraction, density, volume, state of matter)
2. Describe and explain what happens to balloons when they are heated/cooled
3. Describe what happens to a cold beverage container on a hot day?
4. Explain how a glass (mercury) thermometer works.

Answers

1) The speed of the particles would increase when heated

2) The balloon would expand when heated and contract when cooled.

3) On a hot day, the pressure of the gas in a beverage increases

4) The mercury thermometer works by expanding or contracting in response to temperature change.

What is effect of temperature?

We know that one of the effects of temperature is that it is able change the molecular motion of an object. Thus the molecules of an object are able to move faster when heat is applied and they are able to slow down when the heat is removed.

This is why a balloon would have a greater volume when the temperature is increased as the gas molecules spread out. The volume would reduce or decrease when the temperature is reduced.

Also, on a hot day, a beverage would tend to be more fuzzy as the pressure of the gas in the beverage would increase as the temperature is increased.

Lastly, when we use the mercury thermometer, the volume of the mercury would increase and this is the reason for the expansion of the mercury during temperature measurement.

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Which of the following statements regarding physical and chemical changes is true?

Answers

There’s no choices to pick from

Please write the equilibrium constant expression for the following reaction: 3 P(s) + 4 O2 (g) = P₃O₈ (s). Please use brackets, superscripts, and subscripts where appropriate. You may indicate the denominator of the equilibrium expression by using the division symbol, I. Watch out for the phase of each reagent!

Answers

The equilibrium constant expression for the reaction 3P(s) + 4O2(g) ⇌ P₃O₈(s) is as follows:

K = [P₃O₈(s)] / ([P(s)]³ [O2(g)]⁴)

The numerator of the expression, [P₃O₈(s)], represents the concentration of P₃O₈ in the solid phase at equilibrium. The denominator consists of the concentrations of P raised to the power of 3 ([P(s)]³) and O2 raised to the power of 4 ([O2(g)]⁴). These exponents reflect the stoichiometric coefficients of the reactants in the balanced equation, indicating their respective contributions to the equilibrium constant.

The equilibrium constant expression provides a quantitative measure of the extent to which the reaction favors the formation of products or reactants at equilibrium.

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A real (non-Carnot) heat engine, operating between heat reservoirs at temperatures of 554 and 280 performs 2.4 kJ of net work and rejects 8.3 kJ of heat in a single cycle. What is the thermal efficiency of this heat engine in decimal form ( with two decimal places)?

Answers

The thermal efficiency of the heat engine is 22.86%.

The thermal efficiency of a heat engine is defined as the ratio of the net work output to the heat input. It can be calculated using the formula:

Thermal Efficiency = (Net Work Output / Heat Input) * 100

In this case, the net work output is given as 2.4 kJ, and the heat input is the sum of the net work output and the heat rejected, which is 2.4 kJ + 8.3 kJ = 10.7 kJ. Plugging these values into the formula:

Thermal Efficiency = (2.4 kJ / 10.7 kJ) * 100 = 22.43%

Therefore, the thermal efficiency of the heat engine is approximately 22.86% when rounded to two decimal places. This indicates that only 22.86% of the input heat is converted into useful work, while the remaining percentage is lost as waste heat

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What is the correct unit for M1 and M2?

Answers

Answer:

M1 and M2 are the masses of two. objects exerting the force on each other, and R is the distance. between their centers.

Explanation:

M1 and M2 are the masses of two. objects exerting the force on each other, and R is the distance. between their centers.

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