1. A potassium atom has a larger atomic radius than a sodium atom. What statement about potassium correctly explains this difference?
A) It has a larger nuclear charge
B) It has a lower electronegativity
C) It has more energy levels occupied by electrons
D) It has a lower ionization energy

2. Which of the following elements has the greatest electron affinity (largest negative value)?
A) Mg
B) Al
C) Si
D) P
E) S

3. The electron affinity of fluorine is essentially equal to
A) The negative of the ionization energy F
B) The ionization energy F-
C) The negative of the ionization energy F-
D) The ionization energy Ne
E) The negative of the ionization energy Ne

Answers

Answer 1
The answer for number one is C
Answer 2

The electron affinity is the energy required to remove an electron from an atom to yield a negative ion.

We know that atomic size increases down the group as more shells are added. This is because, inter-electronic repulsion pushes the electrons in the outermost shell farther away from the nucleus. Hence potassium atom has a larger atomic radius than a sodium atom because It has more energy levels occupied by electrons.

Electron affinity increases across the period. The more nonmetallic an element is, the more negative its electron affinity. Hence, sulfur has the greatest electron affinity.

Electron affinity is the opposite of ionization energy. It therefore follows that, the electron affinity of fluorine is essentially equal to the negative of the ionization energy F.

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Related Questions

Define physical and chemical properties, provide three examples of each, discuss their reversibility, and explain the fundamental differences between them.

Answers

Answer:

Physical properties are defined as the properties which can be observed without changing their chemical composition.

For example, color, volume, and molecular weight.

Chemical properties can be defined as, a properties that can be seen only after changing the substance's chemical identity.

For example, reactivity, toxicity, and flammability.

The fundamental differences between physical and chemical properties are as follows:

Chemical properties are related to chemical bonds of the substance, while physical properties are not.

In chemical properties, the chemical identity of substance changes while physical properties does not have any change.

Chemical properties predict the reaction of a substance, while physical properties only describe the appearance of the substance.

   

Explanation:

write the electronic configuration of the first 20 element​

Answers

Argon -Potassium-carbon

What are the units of molar mass?
A. L/g
B. mol/g
C. g/L
D. g/mol
SUBST

Answers

Answer:

D - g/mol

step by step method

D
I think its the best answer

2 Figure 3.1 shows two different forms of carbon, A and B.
A
B
Figure 3.1
a Name the two forms of carbon shown.

Answers

Answer:

show the pictures pls specify

Question 2: thanks!!!

Answers

Ans 33333333333333333333333333 cellulose

A fixed mass of gas has a volume of 92 cm cube and 3 degrees Celsius. What will be its volume at 18 degrees celsius if the pressure remains constant?​

Answers

Answer:

94.8454

Explanation:

Let volume be V

Let Temperature be T

V1= 92

T1= 3C but to kelvin 273+3= 300K

V2= ?

T2= 18 C but to kelvin 18+273= 291

[tex] \frac{v1}{t1} = \frac{v2}{t2} [/tex]

[tex] \frac{92}{300} = \frac{v2}{291} [/tex]

[tex]v2 \times 300 = 92 \times 291[/tex]

[tex]v2 = \frac{92 \times 291}{300} [/tex]

[tex]v2 = 94.8454[/tex]

Which statement is true?

1. Heat refers to a process.
2. Thermal energy refers to a process.
3. Thermal energy refers to a single particle.
4. Heat refers to a quantity.

Answers

Answer:

4. Heart refers to a quantity

Answer:

Heat Refers To A Process

To convert from one metric unit to another metric unit is done simply by moving the decimal place the appropriate amount of places.

Example: 2.5 cm = 25 mm

true or false?​

Answers

Answer: true

Explanation:

2.5 cm does = 25mm

Answer:

True

Because, all of these metric units differ from one another by a multiple of 10.

Which of the following has maximum number of atoms?
(a) 18 g of H2O
(b) 18 g of O2
(c) 18 g of CO2
(d) 18 g of CO4​

Answers

Answer:

(a) 18 g of H2O

Explanation:

The molecule with great number of moles will have great number of atoms.

By observation, since all compounds have same mass, water has the least molcular mass

[tex]H_{2} O = \: 18 \: g[/tex]

Answer:

18g of H2O

Explanation:

the molecule with great number of moles will have great number of atoms .

(a) option is correct

Infrared waves are an example of heat transfer by
A. convection
B. radiation
C. conduction
D. motion of the air

Answers

Answer:

convection is my correct answer

Molar mass calculation for Cl^2

Answers

Answer:

Mass of Cl = 35.5

Mass of Cl2 => 35.5×2

=> 71 g/mol

hope that helps ✌

Answer:

71

explain:

The atomic mass of chlorine is equal to the molar mass of chlorine so the molar mass of chlorine is 35.5

=> molar mass for Cl^2: 35,5*2=71

What Chemicals including in Cosmetic?​

Answers

The chemicals including in cosmetic are:-

1.Talcum Powder

2.Nanoparticles

3.Coal Tar

4.Triclosan

5.Toluene

Hope this helps you.

Compare and contrast qualitative and quantitative data.

Answers

Answer: Qualitative data typically consists of words while quantitative data consists of numbers.

Explanation:

Determine the mass of oxygen in a 45.0 g sample of calcium carbonate

Answers

Answer:

The mass of oxygen in 45.0 g sample of calcium carbonate is approximately 21.58 g

Explanation:

The chemical formula for calcium carbonate is CaCO₃

The molar mass of CaCO₃ = 100.0869 g/mol

The mass of oxygen in one mole of CaCO₃ = 3 × 15.999 g = 47.997 g

The mass of oxygen in 45.0 g sample of CaCO₃, m, is goven as follows;

m = 45.0/100.0869 × 47.997 g ≈ 21.58 g

The mass of oxygen in 45.0 g sample of calcium carbonate, m ≈ 21.58 g

Which atom is abundant on earth​

Answers

Answer:

Oxygen

Explanation:

Oxygen is abundant on earth

solution is an example of______mixtures​

Answers

Answer:

homogeneous mixture must be the answer

how can you identify if a physical or chemical change has occurred

Answers

Answer:

The difference between a physical reaction and a chemical reaction is what its made of. In a chemical reaction, there is a change in the materials of the substances in question; in a physical change there is a difference in the appearance, smell, or simple display of a sample of matter without a change in composition. Whereas will a chemical change there is not.

Answer:

Answer:

Physical changes are changes affecting the form of a chemical substance, but not its chemical composition. Physical changes are used to separate mixtures into their component compounds, but can not usually be used to separate compounds into chemical elements or simpler compounds.  Chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. These processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. Some signs of a chemical change are a change in color and the formation of bubbles. The five conditions of chemical change: color chage, formation of a precipitate, formation of a gas, odor change, temperature change. Change in Color. Noticeable Odor (after reaction has begun) Formation of a Precipitate. Formation of Bubbles.  Physical changes are changes that do not alter the identity of a substance. Chemical changes are changes that occur when one substance is turned into another substance. Chemical changes are frequently harder to reverse than physical changes

Explanation:

What is the difference between a strong base and a weak base?
A. A strong base is always more concentrated than a weak base,
B. A strong base has a lower Ki than a weak base.
C. A strong base produces more ions in solution than a weak base,
D. A strong base is not as conductive as a weak base.

Answers

Answer:

C

Explanation:

step by step of how to convert fahrenheit and celsius to kelvins -5F to kelvins please and thank you

Answers

(-5-32)•5/9 + 273.5= K

(-37)•5/9 + 273.5=K

185/9 + 273.5=K

-20.55+273.5=K

252.59=K


( that 9 is dividing the (-5-32)•5 )

What is the pressure of 4 moles of helium in a 50 L tank at 308 K?
Use PV = nRT.
A. 24.64 atm
B. 0.13 atm
O C. 0.51 atm
D. 2.02 atm

Answers

Answer:

D

Explanation:

P = Pressure

V = Volume

n = Moles

R = .08206 (because we're using liters)

T = Temperature (as K)

P(50) = (4)(.08206)(308)

P(50) = 101.09792

Divide both sides by 50

P(50)/50 = 101.09792/50

P = 2.0219584

Answer:

[tex]\boxed {\boxed {\sf D. \ 2.02 \ atm}}[/tex]

Explanation:

We are asked to find the pressure of helium gas using the ideal gas law.

[tex]PV= nRT[/tex]

In this formula P is the pressure, V is the volume, n is the number of moles of gas, R is the universal gas constant, and T is the temperature.

The pressure is unknown and we are solving for it. The volume is 50 liters, there are 4 moles of helium gas, the universal gas constant is 0.08206 L *atm/ mol * K, and the temperature is 308 Kelvin.

[tex]\bullet \ V= 50 \ L \\\bullet \ n= 4 \ mol \\\bullet \ R = \frac {0.08206 \ L * atm}{mol *K}\\\bullet \ T= 308 \ K[/tex]

Substitute these values into the formula.

[tex]P * 50 \ L= 4 \ mol * \frac {0.08206 \ L * atm}{mol *K} * 308 \ K[/tex]

Multiply on the right side. The units of moles (mol)  and Kelvin (K) cancel each other out.

[tex]P* 50 \ L = 4 * 0.08206 \ L *atm * 308[/tex]

[tex]P*50 \ L =0.32824 \ L * atm *308[/tex]

[tex]P* 50 \ L = 101.09792 \ L * atm[/tex]

We are solving for the pressure, so we must isolate the variable P. It is being multiplied by 50 liters. The inverse operation of multiplication is division, so divide both sides by 50 L.

[tex]\frac {P* 50 \ L}{50 \ L} = \frac {101.09792 \ L * atm}{50 \ L}[/tex]

[tex]P= \frac {101.09792 \ L * atm}{50 \ L}[/tex]

The units of liters (L) cancel.

[tex]P= \frac{101.09792}{50 } \ atm[/tex]

[tex]P= 2.0219584 \ atm[/tex]

If we round to the nearest hundredth place the 1 in the thousandth place tells us to leave the 2 in the hundredth place.

[tex]P \approx 2.02 \ atm[/tex]

The pressure is approximately 2.02 atmospheres and choice D is correct.

b. What chemist finds
out how much nitrogen is in a sample of air

Answers

rkckfkfkckdkfjcjenrjv

Determinar el volumen de 20 kg de benceno si su densidad es de 0,88g/cm3

Answers

Answer:

volume = mass/ densidad

0.88g/cm3 = 880kg/m3

v=20kg/880kg/m3

v=0.02272727272

o puede ser 0.0227

o tambien puede ser 0.023

The volume of a gas was 48 mL when the temperature was 159.6 ºC. If the temperature was initially 4.9 ºC, and there was no change in the pressure, what was the initial volume of the gas?

Answers

V1=48mLT1=159.6°CT2=4.9°CV2=?

According to Charles law

[tex]\boxed{\sf \dfrac{V_1}{T_1}=\dfrac{V_2}{T_2}}[/tex]

[tex]\\ \sf\longmapsto \dfrac{48}{159.6}=\dfrac{V_2}{4.9}[/tex]

[tex]\\ \sf\longmapsto V_2=\dfrac{48\times 4.9}{159.6}[/tex]

[tex]\\ \sf\longmapsto V_2=\dfrac{235.2}{159.6}[/tex]

[tex]\\ \sf\longmapsto V_2=1.4mL[/tex]

A report on the various water conservation methods used by any one
states of India

Answers

Answer:

Kuls are diversion channels that carry water from a glacier to village. Often spanning long distances, with some over 10 km long, kuls have been around for centuries. They are the lifeline of people of Spiti valley of Himachal Pradesh and in Jammu too.

Kul starts at the glacier, which is to be tapped. Keeping the head clear of debris is achieved by lining the sides of Kul with stones which ensure that there is no seepage or clogging. The Kul leads to the village where the water is stored in a circular water tank. The water is drawn from here are per the need of the village.

Explanation:

Here is a list of some of the traditional water conservation methods that are still in use:

Which of the following is an example of a chemical change?
A. Sugar breaking down into water and carbon when it is heated
B. A sugar cube being crushed by a spoon
C. Sugar mixing with red food coloring and forming a red solid
D. A sugar cube dissolving in water as the water is stirred

Answers

Answer:

I think its sugar breaking down into watee and carbon when it is heated

I HOPE ITS RIGHT IF NOT THEN SORRY

HAVE A GREAT DAY :)

Balance in basic solution: O2(g) + Cr³+ (aq) → H₂O2 (1) + Cr₂O7²- (aq)

Answers

cr2o72+H2o2-(r3+o2)

Explanation:

r62o72+H2o2-(r3+o2)

Please tell me the answer of what is unit? ​

Answers

Answer:

a quantity chosen as a standard in terms of which other quantities may be expressed.

Explanation:

Explanation:

Unit is a standard physical quantity defined and adopted by convention,with other quantity of same kind.

what is the balanced equation of 2HCl + Mg - MgCla + Ha​

Answers

2HCl + Mg => MgCl2 + H2

Water is dipolar because:
A. It has two hydrogens, each of which pulls oxygen's electrons and separates the
charges into two areas.
B. Oxygen pulls electrons closer to itself than hydrogens, giving the oxygen a
slight negative and hydrogens a slight positive charge.
C. Oxygen pulls electrons closer to itself than hydrogens, giving the oxygen a
slight positive and hydrogens a slight negative charge.
OD. It has two hydrogens, each of which has its own polar area.

Answers

Answer:

B. Oxygen pulls electrons closer to itself than hydrogens, giving the oxygen a slight negative and hydrogens a slight positive charge.

Explanation:

In the water molecule (H2O), an oxygen atom is bonded to two hydrogen atoms. Oxygen atom is much more electronegative (has more attraction for electrons) than hydrogen atom, hence, it pulls electrons from one one of the hydrogen atoms bonded to it making it more negatively charged and the hydrogen atom, more positively charged.

The possession of positive charge (+) and negative charge (-) in the same molecule, caused by uneven flow of electrons is what it means to be DIPOLAR (from dipole). Hence, water is DIPOLAR because oxygen pulls electrons closer to itself than hydrogens, giving the oxygen a slight negative and hydrogens a slight positive charge.

Which of the following type of matter has weakest interparticle force of attraction O a. Liquid water
O b. Iron
O c. Steam
O d. sand ​

Answers

Answer:(b)liquid water is correct option . Because it is a molecular solid and molecular solid has weak interparticle forces of attraction

Explanation:

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