state and explain the trend in electronegativity values across period 3 from sodium to chlorine

Answers

Answer 1

The trend in electronegativity values across period 3 from sodium to chlorine is that sodium with 11 protons is the least electromagnetic element and chlorine with 17 protons is the most electronegative element.

What is electronegativity?

It should be noted that electronegativity simply means a chemical property that describes the tendency of an atom to attract elements towards it.

In this case, the trend in electronegativity values across period 3 from sodium to chlorine is that sodium with 11 protons us the least electromagnetic element and chlorine with 17 protons is the most electronegative element.

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Related Questions

3
Which statement describes the law of conservation of energy?
O All systems will exchange matter and energy with their surroundings.
O All systems can exchange energy, but not matter, with their surroundings.
Energy cannot be created nor destroyed, but it changes from one form to another.
O Energy is destroyed in most chemical reactions when new products are formed.

Answers

Energy cannot be created nor destroyed, but it changes from one form to another. Hence, option C is correct.

What is energy?

Energy is the ability to do work.

In physics and chemistry, the law of conservation of energy states that the total energy of an isolated system remains constant; it is said to be conserved over time.

This law means that energy can neither be created nor destroyed; rather, it can only be transformed or transferred from one form to another.

Hence, option C is correct.

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Calculate the molecular mass of Al2(SO4)3(Molecular mass of Al=27, S=32, O=16) Pls fast

Answers

Al₂(SO₄)₃

= 2.Al+3.S+12.O

= 2.27 + 3.32+12.16

= 54+96+192

=342 g/mol

Solve the given division and express the answer in terms of scientific notation. 4.8
x 104 by 1.6 × 10³ =

Answers

The regular answer would be 30 but in scientific notation it is 3x10^1.

Which statement is true for most chemical reactions?
O An energy change occurs during the breaking and forming of bonds.
O The internal energy of the system increases during a reaction.
O Energy is released during the formation of reactants.
O The enthalpy of the products is higher than the enthalpy of the reactants

Answers

Answer:

An energy change occurs during the breaking and forming of bonds.

Explanation:

Answer:

An energy change occurs during the breaking and forming of bonds.

Explanation:

Energy changes occur when bonds are broken or formed.

When a bond is formed, energy is released.

When a bond is broken, energy is stored.

Edge 2022

Thermochemical Reactions Quiz answer

What is the name of CH3CH2CHMgBr(CH3)?​​

Answers

Answer:

Ethyl magnesium Bromide

How does the number of molecules in 1 mol of oxygen compare with the number of molecules in 1 mol of nitrogen?
O 1 mol of oxygen has fewer molecules.
O 1 mol of oxygen has more molecules.
O Each sample has the same number of molecules.
O The molecules cannot be compared without knowing the mass.
Mark this and return
4
Save and Exit
Next
Subinit

Answers

Answer:

Each sample has the same number of molecules.

Explanation:

This is true by Avogadro's law.

The speed of light through space is

Answers

The speed of light through space is 300 million m/s .

What is the limit of the speed ?

There was a time when everybody thought that there is no limit for the speed at which an object can travel , but Einstein gave the limit which is the speed of light.

The speed of the light in vacuum travels at a speed of 300 million m/s .

Therefore The speed of light through space is 300 million m/s .

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The melting points of electrovalent compounds are higher than the melting points of covalent compounds. Why?​

Answers

Explanation:

There is an electrostatic force holding the electrovalent bonds together and they're usually structured, whereas in covalent, they are usually free and are only held together by a very weak intermolecular force

Which type of molecule is made from amino acids?

Answers

Answer:

protein molecule

Explanation:

Answer: Protein

Explanation:

Amino acids from protein molecules.

7.0 mol Mn reacts with 5.0 mol
O2 according to the equation below:
2Mn + O₂ → 2MnO
How many moles of MnO form from
5.0 mol Mn?
? ] mol MnO
Round your answer to the tenths place.

Answers

Answer:

5.0 mol

Explanation:

From the coefficients of the equation, we know that for every 2 moles of Mn consumed, 2 moles of MnO are produced.

Thus, the number of moles of Mn consumed is equal to the number of moles of MnO produced, and thus the answer is 5.0 mol.

The moles of MnO formed with the reaction of 5 moles of Mn is 3 moles.

What is a limiting reagent?

In a chemical reaction, the reagent that is present in a lesser quantity and governs the rate of the reaction is termed as the limiting reagent.

In the reaction of the formation of MnO, according to the stoichiometric law 2 moles of Mn reacts with 1 moles of Oxygen.

Thus, the moles of oxygen consumed by 7 moles of Mn is:

2 moles Mn = 1 mole O₂

7 moles Mn = 3.5 moles O₂

The available moles of O₂ = 5 mol.

The remaining moles of O₂ = 5-3.5 moles

The remaining moles of O₂ = 1.5 moles

The reaction of 5 moles Mn requires 2.5 moles of O₂, whereas the available moles of oxygen is 1.5 moles. Thus, oxygen serves as the limiting reagent.

The moles of MnO formed with the reaction of 5 moles Mn and 1.5 moles O₂

1 mole O₂ = 2 moles MnO

1.5 moles O₂ = 2 * 1.5 moles MnO

1.5 moles O₂ = 3 moles MnO

Thus, the moles of MnO formed with the reaction of 5 moles of Mn with the available oxygen is 3 moles.

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The thermite reaction reacts iron (III) oxide, Fe2O3, with aluminium powder,Al, the form aluminium oxide, Al2O3 and iron, Fe.

A. a student reacted 16.0g of iron with 8.1g of aluminium powder. which of the two reactants is the limiting reagent? Show your working.

B. Calculate the maximum mass of iron of iron that could be formed using these quantities of reactants.

Answers

Answer:

This answer assumes that the strated "16.0g of iron" was meant to be 16.0 grams of iron(III) oxide.

Explanation:

To start, the thermite equation must be balanced.

I find:

1Fe2O3 + 2Al = 1Al2O3 + 2Fe

This tells us we need 2 moles of Al for every 1 mole of Fe2O3.  

Now calculate the moles of each reactant:

Moles Fe2O3:  16.0 g/159.7 g/mole = 0.100 moles Fe2O3

Moles Al:  8.1 /26.98 g/mole = 0.300 moles Al

The balanced equation says that in order to react all of the Fe2O3 we'd need twice that amount (in moles) of the Al.  (0.100 moles Fe2O3)*(2) = 0.200 moles Al.

Which of the two reactants is the limiting reagent?

We have more than enough moles of Al to react with 0.10 moles of Fe2O3.  (We have 0.300 moles Al and all we need is 0.200 moles to react with the 0.10 moles of Fe2O3.  Fe2O3 is the limiting reagent.

Calculate the maximum mass of iron of iron that could be formed using these quantities of reactants.

The balanced equation tells us that we will obtain 2 moles of Fe for every 1 mole of Fe2O3 consumed.  Since Fe2O3 is the limiting reagent, we will assume that it completely reacts.  That means 0.1 moles of Fe2O3 is reacted.  Since we expect twice that many moles of Fe, we should obtain 0.200 moles of Fe.  At 55.85 g/mole, we should obtain:

(0.200 moles Fe)*(55.85 g Fe/mole Fe) = 11.2 grams Fe

A substance has a melting point of 80 °C. Which of the following is true for the substance? (5 points)

a) It will also change from a liquid to a gas at 80 °C while the liquid loses energy.

b) It will also change from a liquid to a gas at 80 °C while the liquid gains energy.

c) It will also change from a liquid to a solid at 80 °C while the liquid gains energy.

d) It will also change from a liquid to a solid at 80 °C while the liquid loses energy.

Answers

Answer:

D

Explanation:

The liquid loses energy while being cooled. It therefore changes to a solid when the liquid is cooled from a temperature above 80°C to 80°C

A substance has a melting point of 80 °C.  It will also change from a liquid to a solid at 80 °C while the liquid loses energy and the correct option is option D.

At the substance's melting point of 80 °C, it undergoes a phase transition from a liquid to a solid. During this transition, the substance loses energy to the surroundings as it releases heat to form a solid structure. The process is called solidification or freezing.

As the substance cools down from a higher temperature to 80 °C, its molecules lose kinetic energy, and they arrange themselves into a more ordered and stable lattice, resulting in the formation of a solid. This release of energy is why the liquid loses energy during the transition. Once the substance reaches 80 °C, it remains at this temperature until the entire amount has solidified.

Thus, the ideal selection is option D.

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What is the oxidation state of S in H₂SO4?
OA. +8
OB. +6
OC. -4
OD. -2

Answers

Answer:

B.) +6

Explanation:

To find the oxidation number of sulfur, we can assume the oxidation numbers of the other elements.

What I mean is, oxygen (O) always has an oxidation number of (-2). That being said, if there are 4 oxygen atoms, oxygen is contributing -8 overall. We also know that hydrogen generally has an oxidation number of (+1). Like before, if there are 2 hydrogens, it must be contributing +2.

If the overall molecule is neutral, we have to get these charges to balance out.

In essence, -8 + 2 + ? = 0?

If you combine the charges from oxygen and hydrogen, you are left with -6. Therefore, to make the molecule neutral, sulfur must have an oxidation number of +6.

Aluminum oxide reacts with lithium metal. What is the coefficient for lithium when the equation is balanced?

Answers

Answer:

The Coefficient is 1

Explanation:

A student placed equal-sized potato cubes in two different beakers containing either distilled (pure) water or a concentrated sugar solution. The experiment is shown in Figure 2.

Explain

what would happen to the mass of the potato cube after being placed in distilled (pure) water

Please help me

Answers

When the potato is put into the distilled water, it will absorb the water. The water is trying to dilute the salt inside the potato.

What is the meaning of concentrated?

The concentration of a solution is a measure of the amount of solute that has been dissolved in a given amount of solvent or solution.

When the potato is put into the distilled water, it will absorb the water. The water is trying to dilute the salt inside the potato.

Since potatoes already contain sugar, less water will diffuse out of the potato placed in sugar water. The slice placed in water will be rigid since it will absorb water.

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How many hydrogen atoms are present in 2-methyl-2-butene?

Answers

There are three kinds of Hydrogen in  2-methyl-2-butene

The correct question is

How many kinds of  hydrogen atoms are present in 2-methyl-2-butene

What is an atom ?

Atom was discovered by Dalton's Atomic theory , he predicted that each element consist of large number of a very small thing known as atom.

In the structure of 2-methyl-2-butene there are 3 types oh Hydrogen

1. Attached to the Carbon atom connecting the methyl ion to the butene

2. Connected to the last Carbon atom

3. Connected to the Carbon bond having double bond.

Therefore there are three kinds of Hydrogen in  2-methyl-2-butene.

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What is the molar concentration of
a solution that contains
5.0 mol HCl in a total volume
of 10.0 L?

Answers

Answer:

0.5 M

Explanation:

Molar concentration : M = n/v

n = moles of solute

v = liters of solution

Hence, 5.0 / 10.0 = 0.5 M

WILL GIVE BRAINLIEST
The table shows the number of reactants and products present during two separate chemical reaction

Which of the following statements correctly identifies the decomposition reaction and describes a substance involved?
Chemical reaction A, because the reactant is a compound
Chemical reaction B, because the product is a compound
Chemical reaction A, because the reactant is an element
Chemical reaction B, because the product is an element

Answers

Answer:

Chemical reaction A, because the reactant is a compound

Explanation:

In a decomposition reaction, a compound is broken down into its components, so the number of products is greater than the number of reactants

Chemical reaction A, because the reactant is a compound is a statements correctly identifies the decomposition reaction and describes a substance involved.

What is chemical reaction?

When atoms establish or break chemical bonds, chemical processes take place. Reactants are the substances that begin a chemical reaction, while products are the compounds that are created as a result of the reaction.

Although a chemical reaction is not always a "one-way street," as we'll examine further in the next section, an arrow is drawn between the reactants and products to denote the direction of the reaction.

 Our equation must have them in it in order for there to be an equal number of atoms of each element on both sides of the equation.

Therefore, Chemical reaction A, because the reactant is a compound is a statements correctly identifies the decomposition reaction and describes a substance involved.

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2. If a student drops a 2.3 g piece of magnesium into a flask of hydrochloric acid, this reaction occurs: Mg + 2HCl MgCl2 + H2
How many liters of hydrogen can be produced at a pressure of 2 atm and a temperature of 298 K?

Answers

1.2 L of hydrogen can be produced at a pressure of 2 atm and a temperature of 298 K.

What is an ideal gas equation?

The ideal gas law (PV = nRT) relates the macroscopic properties of ideal gases. An ideal gas is a gas in which the particles (a) do not attract or repel one another and (b) take up no space (have no volume).

Step 1: Write the balanced equation

Mg + 2 HCl ⇒ MgCl₂ + H₂

Step 2: Calculate the moles corresponding to 2.3 g of Mg

The molar mass of Mg is 24.31 g/mol.

2.3 g × 1 mol ÷24.31 g = 0.095 mol

Step 3: Calculate the moles of H₂ produced

0.095 mol Mg × 1 mol H₂ ÷ 1 mol Mg = 0.095 mol H₂

Step 4: Calculate the volume occupied by the hydrogen

We will use the ideal gas equation.

P × V = n × R × T

V = n × R × T÷P

V = 0.095 mol × (0.0821 atm.L/mol.K) × 298 K÷2 atm

V =  1.2 L

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Why does carbonic acid gives an acid salt but hydrochloric acid does not?​

Answers

Answer:

Solution. Carbonic acid is a dibasic acid with two replaceable hydrogen ions; therefore it forms one acid salt or one normal salt. Hydrochloric acid is a monobasic acid with one replaceable hydrogen ion and so forms only one normal salt.

Explanation:

Calculate the bond length (in picometers) of a chemical bond between bromine and sulfur.

Bromine—atomic radius: 119 pm; covalent radius: 114 pm; ionic radius: 182 pm.

Sulfur—atomic radius: 109 pm; covalent radius: 102 pm; ionic radius: 184 pm.

Answers

The bond length of a chemical bond between bromine and sulfur is 216 picometers.

Explanation:Bromine and sulfur reacts with each other to form Sulfur dibromide.Sulfur dibromide is a covalent compound which means that a chemical bond exist between them is covalent bond.So, for finding a bond length of a covalently bonded compound we need to add the covalent radiuses of the two atoms.

Given,

Covalent radius of bromine is 114 pm;

and  covalent radius of sulfur is102 pm.

 Bond length of the sulfur dibromide= Covalent radius of bromine +  covalent radius of sulfur

∴  Bond length = 114 + 102

∴  Bond length = 216 pm.

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Please help me solve this questionn as fast as possible oofff

Answers

Answer:

sorry I don't know it I'm only 7 th grade

Using the balanced chemical equation, determine the
number of moles of aluminum required to react with 7.53
mol of chlorine.

2Al(s) + 3Cl2(g) -> 2AlCl3(s)

Answers

Answer:

5.02 mol

Explanation:

n(Al) : n(Cl)

2 : 3

x : 7.53

3x = 15.06

n(Al) = 5.02mol

A solute that has been dissolved in a solvent ________.

Answers

Answer:

a solution: for example when sugar is dissolved in water it becomes a sugar solution

(100 POINTS) WILL MARK BRAINLIEST
Which of the following explains how one of the postulates in John Dalton's atomic theory was later subjected to change?

Various scientists found that all atoms of a particular element are identical.
Some scientists found that atoms combine in simple whole number ratios to form compounds.
Various scientists found that atoms consist of subatomic particles with varying mass and charge.
Some scientists found that bonds between atoms are broken, rearranged, or reformed during reactions.

Answers

One of the postulates in John Dalton's atomic theory was later subjected to change was that Various scientists found that atoms consist of subatomic particles with varying mass and charge. option C is correct.

What are subatomic particles?

An atom is consist of three sub atomic particles called proton, neutrons and electrons also known as the fundamental nit of an atom.

Atom consist of an nucleus into which proton and neutrons are present and protons are positively charged whereas neutrons are neutral and electrons revolve around the nucleus in the fixed paths called shells and negatively charged.

Therefore, the postulates in John Dalton's atomic theory was later subjected to change was that Various scientists found that atoms consist of subatomic particles with varying mass and charge. option C is correct.

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Answer:

D. some scientists found that bonds between atoms are broken rearranged or reformed during reactions. According to Dalton's other theories, this is the only one that differentiates from his original theories :)

Explanation:

A 208.1 mL sample of gas exerts 574.6 mm Hg pressure at 44.4 ºC. What pressure does it exert at 68.1 ºC if the volume expands to 401.5 mL?
a. 320
b. 457
c. 190
d. 917

Answers

Answer:

a.  P = 320 mmHg

Explanation:

For this problem, the pressure, volume, and temperature are changing, so we'll need to combine Boyle's Law and Charles' Law:

[tex]\dfrac{P_1V_1}{T_1}=\dfrac{P_2V_2}{T_2}[/tex]

For this equation, the temperatures must be measured in Kelvin.  The rest of units in the equation only need to match between beginning and end conditions.

Recall that to convert from Celsius to Kelvin, add 273, or use the equation [tex]T_C+273=T_K[/tex].

So [tex]T_1=(44.4+273)[K]=317.4[K][/tex]  and [tex]T_2=(68.1+273)[K]=341.1[K][/tex]

Substituting known values, we can solve for the unknown:

[tex]\dfrac{P_1V_1}{T_1}=\dfrac{P_2V_2}{T_2}[/tex]

[tex]\dfrac{(574.6[mmHg])(208.1[mL])}{(317.4[K])}=\dfrac{P_2(401.5[mL])}{(341.1[K])}[/tex]

[tex]\dfrac{(574.6[mmHg])(208.1[mL]\!\!\!\!\!\!\!\!\!\!{--} )}{317.4[K]\!\!\!\!\!\!{-}}*\dfrac{341.1[K] \!\!\!\!\!\!{-}}{401.5[mL] \!\!\!\!\!\!\!\!\!\!\!{--} }=\dfrac{P_2(401.5[mL] \!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!{-----})}{341.1[K] \!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!{----}}*\dfrac{341.1[K] \!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!{----}}{401.5[mL] \!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!{-----} }[/tex]

[tex]320.056719296[mmHg]=P_2[/tex]

Accounting for significant figures, [tex]P_2=320.1[mmHg][/tex].  

The closest answer provided is 320, so "a".


What is the mass of a 7.426-mole sample of sodium hydroxide (NaOH molar mass = 40.0 g/mol)?
Select one:
5.360 g
40.00 g
179.1g
297.0 g

Answers

[tex](40.0)(7.426)=\boxed{297.0 \text{ g (to 4 sf)}}[/tex]

How many grams of nitrogen,
N2, would be required to react with
6.25 moles hydrogen, H2?

Answers

N₂ + 3H₂ → 2NH₃

moles N₂ = 1/3 x 6.25 = 2.083

Answer:

2.083 moles of N₂ would be required to react with 6.25 moles of H₂.

Explanation:

Let us first write the balanced chemical equation :

      N₂ + 3H₂ → 2NH₃

Therefore from this equation it is clear that:

3 moles of H₂ require 1 mole of N₂

∵ 1 mole of H₂ requires [tex]\frac{1}{3}[/tex]  moles of N₂

∵ 6.25 moles of H₂ requires [tex]\frac{(1*6.25)}{3}[/tex][tex]=2.083[/tex] moles of N₂

MOLE CONCEPT :

The mole is an amount unit similar to familiar units like pair, dozen, gross, etc. It provides a specific measure of the number of atoms or molecules in a bulk sample of matter. A mole is defined as the amount of substance containing the same number of discrete entities (such as atoms, molecules, and ions) as the number of atoms in a sample of pure 12C weighing exactly 12 g. One Latin connotation for the word “mole” is “large mass” or “bulk,” which is consistent with its use as the name for this unit. The mole provides a link between an easily measured macroscopic property, bulk mass, and an extremely important fundamental property, number of atoms, molecules, and so forth.

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Which best explains why a firework being ignited is an example of an exothermic reaction and not an endothermic
reaction ?
O The fireworks produce colors.
O The fireworks give off heat.
O Igniting the fireworks requires energy.
O Igniting the fireworks makes an odor.

Answers

the fireworks give off heat

The best explanation for why a firework being ignited is an example of an exothermic reaction and not an endothermic reaction is:

The fireworks give off heat.

Heat is emitted into the environment in an exothermic reaction. When a firework is lit, it undergoes a number of chemical processes inside the firework combination, which produces gases and produces a great deal of heat. Fireworks' distinctive visual display and audible effects are produced when heat is released as light and sound.

In contrast, heat is taken from the environment during an endothermic reaction. If a reaction were endothermic, it would need an outside energy source to continue, and because it would be absorbing heat from its environment, it would feel chilly to the touch.

However, because they release heat and energy and brighten the night sky, fireworks are instances of exothermic reactions.

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How many calories are absorbed
when water absorbs 6.55 kJ of
energy?
[?] cal

Answers

The number of calories which are absorbed when water absorbs 6.55 KJ of energy is 1565.49 calories

How do I determine the number of calories absorbed?

To know the number of calories which are absorbed when water absorbs 6.55 KJ of energy, we shall begin by converting 6.55 KJ to joules (J). Details below:

Energy (in KJ) = 6.55 KJEnergy (in J) =?

1 KJ = 1000 J

Therefore,

6.55 KJ = (6.55 KJ × 1000 J) / 1 KJ

6.55 KJ = 6550 J

Finally, we shall convert 6550 J to calories. This is illustrated below:

Energy (in J) = 6550 JEnergy (in calories) =?

4.184 J = 1 calorie

Therefore,

6550 J = (6550 J × 1 calorie) / 4.184 J

6550 J = 1565.49 calories

Thus, from the above calculations, we can conclude that the number of calories absorbed is 1565.49 calories

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