Which Correctly Summarizes The Trend In Electron Affinity? It Tends To Be Very High For Group 2. It Tends (2023)

Chemistry Middle School


Answer 1

Answer: Option (d) is the correct answer.


The amount of energy released when an electron is added to a neutral atom or ion preset in gaseous phase to form a negative ion then it is known as electron affinity.

As we move across a period, due to the decrease in size of atom there will be increase in electron affinity. And, when we move down a group then there will be decrease in electron affinity.

More positive is the value of electron affinity more readily the atom can gain an electron. And, more negative value of electron affinity means atom will have difficulty in gaining an electron.

Thus, we can conclude that the statement it tends to be more negative down a group correctly summarizes the trend in electron affinity.

Answer 2




took test and got it right

Related Questions

Which equation shows how velocity is related to frequency and wavelength? Ο Α. ν-

Ο Β. ν =

Ο C. v=f - 3

Ο D. ν = fx3



D. v = f×3


if we look at it from the equation for the energy of a photon:

(1) E = hc/λ

(2) E = h×f

∴ (1) = (2):

⇒ f = c/λ....frecuency (Hz)

∴ c: velocity (m/s)

∴ λ: wavelength (m)

⇒ c = f×λ

If c [=] v and λ = 3

⇒ v = f×3

What kind of energy transformation happens when a boy uses energy from a sandwich to run the race​


First when a person began to digest the food it becomes a chemical energy. The chemical energy is converted into a kinetic energy. As the body gets energy the kinetic is converted into a mechanical energy.

So here the sandwich is the food I hope it is accurate and helpful:)

Which statement best explains how atmospheric dust particles influence the water cycle?

(1) Dust particles are the main source of

dissolved salts in the sea.

(2) Dust particles increase the capacity of the

atmosphere to hold water vapor.

(3) Dust particles increase the amount of

evaporation that takes place.

(4) Dust particles provide surfaces on which

water vapor can condense.


Answer:(4) Dust particles provide surfaces on which

water vapor can condense


During condensation of clouds dust particles provides spaces where water vapor may condense.

Extend E1 Explain why the arrangement,
movement and energy of
particles change during
changes of state.​

at a pressure of 101.3 kilopascal and a temperature of 373 K, heat is removed from a sample of water vapor, causing the sample to change from the gaseous phase to the liquid phase. This phase change is represented by the equation H20(g) -> H20(l) + heat. Determine the total amount of heat released by 5.00 grams of water vapor during the phase change shown in the given experiment



The amount of heat released is 11.3 KJ


H20(g) -> H20(l) + heat

This reaction is changing state from gaseous to liquid without changing the temperature. This heat is know as Latent heat. It is the energy required for a phase change.

Heat released by 5 g of water vapor (Q) = M × L

where M = mass of vapor

L= latent heat

Latent heat can be divide into 2

  1. Latent heat of fusion
  2. Latent heat of vaporization

Since we are change the gaseous state to liquid, we will be working with Latent heat of vaporization which has a value of 22.6 x 10 ∧5 J/kg

(Q) = M × L

= 0.005 x 22.6 x 10 ∧5

= 11300 J

= 11.3 KJ

If the vapour pressure of of water equals 0.03 atm (at 25°C), what is the vapour pressure of the solution which is produced from adding 5 mol of ethylene glycol to 1 L of water
at the same temperature ?......
a 0.04 atm
b 0.027 atm
c 0.008 atm d 0.01 atm ​



b 0.027 atm


It is possible to solve this question using Raoult's law that says that the partial pressure of each component of an ideal mixture of liquids is equal to the vapour pressure of the pure component multiplied by its mole fraction in the mixture.

To know mole fraction of water you need to know how many moles of water have 1L. Moles are:

1L × (1000g/1L) × (1mol/18,01g) = 55,5 moles of water.

Mole fraction is:

55,5 moles of water / (55,5+5) total moles = 0,917

Thus, vapour pressure of the solution is:

0,917 × 0,03atm = 0,027atm

Right answer is:

b 0.027 atm

I hope it helps!

At the start of a reaction, a 1.00 dm solution contains 0.300 mol of ethanol. After 100 seconds the concentration of the ethanol has decreased to 0.296 mol/dmº
What is the rate of reaction over the first 100 seconds?
A 2.96 x 10-3 mol/dm/s
B 3.00 x 10 mol/dm/s
C 4.00 x 10 mol/dm®/s
D 8.00 x 10 mol/dm/s​




The rate of a chemical reaction is defined as the rate of change of molarity with respect to time. That is, finding the change in molarity and dividing by the change in time will yield the average rate of a reaction.

In this problem, we firstly need to identify the initial molarity, the final molarity, find their difference and divide by the time passed.

Firstly, find the initial molarity dividing the number of moles by the given volume:

Secondly, define the equation based on our definition to calculate the reaction rate:

Given the final molarity of:

We obtain the average rate of change as:

This is, however, the rate of disappearance of ethanol. The reaction rate with respect to the reactants is just the negative value of the rate of change of the reactants:

If you put an egg on a sidewalk on a hot day in July and try to cook it you are using? passive solar energy
geothermal energy
active solar energy



  • Passive solar energy


First of all, you must know that you if you put an egg on a sidewalk you are dealing with energy from the Sun, i.e. solar energy, while geothermal energy is energy that comes from the inner of the Earth and biomass energy comes from plant or animal material.

The term passive solar energy refers to the fact that the energy of the sun is used directly for the intended task, which in this case is to cook the egg.

The term active solar energy refers to the fact that the energy of the Sun is converted into a different form of energy and then used for your purpose. For instance, if the energy of the Sun were used to produce electricity and then this electricity used to cook the egg, you would be using an acitve solar energy.

The formula for hydrated copper(ii) nitrate is Cu(NO3)2.xH2O. It contains 36.5% water crystallization by mass. What is the value of x?

[Ar= H: 1 ; N: 14; O: 16; Cu: 64]

A) 4
B) 5
C) 6
D) 7





The percent mass is equal to the ratio between the mass of the component of interest and the total mass of the compound, multiplied by 100 % in case we need to express it as a percentage.

We may apply this knowledge to write the formula for copper(II) nitrate x-hydrate. Let's assume that we take 1 mole of the compound. Then we will divide x molar masses of water by the molar mass of the overall compound and multiply by 100 % to get the mass percent of water:


Substitute into the formula:

Solve for x:

Because models show is the relationships between parts of a whole, they help us See very small things
Form testable hypothesis
Always have correct information
Stay safe during an experiment


Answer: the answer is form testable hypotheses, the "expert" is wrong


Form Testable Hypothesis


I took the quiz and got it right. Hope this helps :)

Are enzyme-catalyzed reactions examples of homo-
geneous or heterogeneous catalysis? Explain.


Answer:Yes,enzymes are catalyzed reactions

Explanation:Enzymes are protein that speeds up chemical reactions. Enzyme catalyzed reaction are divided into two:

Homogeneous reaction

Heterogeneous reaction.

Homogeneous catalysts occupy the same phase as the reaction mixture, while heterogeneous catalysts occupy a different phase.

Acid catalysis, organometallic catalysis, and enzymatic catalysis are examples of homogeneous catalysis.

Vanadium oxide (V2 O5) is a brown/yellow solid on which the oxygen and sulfur dioxide can adsorb in order to react with each other to form sulfuric acid.

What is the percent of ag in agno3





Could I get help please What type of hazards do the standard pictograms represent?
Select all that apply.






The correct answer is A; Chemical.

Further Explanation:

Pictograms are used per OSHA for the Hazard Communication Standard. All of the pictograms are used to warn the person of the dangers of chemicals. Each pictogram must have a white background and must have a red border around the pictogram.

There is a total of nine pictograms that are used to warn of chemical dangers. The pictograms that are on the labels are;

  1. Health Hazard
  2. Flame
  3. Exclamation Point
  4. Gas Cylinder
  5. Corrosion
  6. Exploding Bomb
  7. Flame over Circle
  8. Environment
  9. Skull and Crossbones

Learn more about pictograms at brainly.com/question/3494954


All of them,





As per OSHA standards, all of the hazards listed are included in standard pictograms.

A diver is able to cut through water in a swimming pool. Which property of matter does this observation show?


Answer: water molocoules moving around the person


Testable question: does the water need to be hot or cold to make a cloud. What data can I use for my science project


Water can consist of hot, cold, or both to form a cloud.

  • With hot water, clouds will form when hot water evaporates then cools when it rises into the air. After, the warm air will expand into the atmosphere. Finally, the warm air will create water vapor that will form water droplets and create the basis of a cloud.
  • The temperature is very low if the water is cold. When it's cold outside, it results in a lower humidity which evaporates the water faster then it would in warm weather since the humidity would be higher. Water droplets in clouds start to form into bits of ice that fall to the earth because of the mass the ice bit has.

Best of Luck!

Does 1 gram of phosphorus react with 6 grams of iodine to form 4 grams of phosphorus triodine in P4(s)+6I2(s)=4PI3(s)





One mole of P₄ react with six moles of I₂ and gives 4 moles of PI₃.

When one gram phosphorus and 6 gram of iodine react they gives 8.234 g ram of PI₃ .

Given data:

Mass of phosphorus = 1 g

Mass of iodine = 6 g

Mass of PI₃ = ?


Chemical equation:

P₄ + 6I₂ → 4PI₃

Number of moles of P₄:

Number of moles = Mass /molar mass

Number of mole = 1 g / 123.9 g/mol

Number of moles = 0.01 mol

Number of moles of I₂:

Number of moles = Mass /molar mass

Number of moles = 6 g / 253.8 g/mol

Number of moles = 0.024 mol

Now we will compare the moles of PI₃ with I₂ and P₄.

I₂ : PI₃

6 : 4

0.024 : 4/6×0.024 = 0.02

P₄ : PI₃

1 : 4

0.01 : 4 × 0.01 = 0.04 mol

The number of moles of PI₃ produced by I₂ are less it will be limiting reactant.

Mass of PI₃ = moles × molar mass

Mass of PI₃ = 0.02 mol × 411.7 g/mol

Mass of PI₃ = 8.234 g

What is catenation in chemistry ​


Catenation is the property of direct bonding between atoms of same element to form a chain.

3.On your graph, the data points between the black squares are data for elements with atomic numbers 3 through 9. Locate these elements on your periodic table. What term or description would you use to identify these elements with respect to the periodic table?



All the given elements belong to the second period of the periodic table


Let's locate the elements with the given atomic numbers:

  • Z = 3, this corresponds to lithium (Li);
  • Z = 4, this corresponds to beryllium (Be);
  • Z = 5, this corresponds to boron (B);
  • Z = 6, this corresponds to carbon (C);
  • Z = 7, this corresponds to nitrogen (N);
  • Z = 8, this corresponds to oxygen, (O);
  • Z = 9, this corresponds to fluorine, (F).

Now notice that each of these 9 elements can be found in the same row of the periodic table. This is period 2. We may then summarize that all of these elements belong to the same period, period number 2.

What is the differences between indicators and universal indicators​



An indicator tells when something is acidic or basic. Universal indicator gives us a clue on how acidic or basic something is.


If the distance between two objects is decreased to - of the original 10
distance, how will it change the force of attraction between them?
O A.
The new force will be 100 times more than the original.
The new force will be 20 times more than the original.
The new force will be – of the original.
The new force will be -- of the original.
The new force will be - of the original.



The new force will be \frac{1}{100} of the original force.


In the context of this problem, we're dealing with the law of gravitational attraction. The law states that the gravitational force between two object is directly proportional to the product of their masses and inversely proportional to the square of a distance between them.

That said, let's say that our equation for the initial force is:

And the force at this distance would be written in terms of the same equation:

Find the ratio between the final and the initial force:

Substitute the value for the final distance in terms of the initial distance:


This means the new force will be \frac{1}{100} of the original force.


the answer is D. it will be 1/100 the original


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