What does an element's group number tell you about an element's chemical and physical properties ?

Answers

Answer 1
The chemical properties of elements are determined by their valence shell electronic configuration.

for example; the group 15 ( nitrogen family ),

The valence shell ( outermost shell ) electronic configuration of is ns2np3 , which clearly shows that all the elements have the tendency to make same kind if bonds with a common element.

That is, consider the hydrates of the group, it is NH3 ( ammonia ),PH3 (phosphine ), AsH3 (arsine ) , SbH3 ( stibine ) etc. They are having the same chemical formula and same type of bond (covalent bond )

The physical properties include melting point, boiling point, density etc.

Here for the same nitrogen family, all elements except nitrogen are solids in room temperature whereas nitrogen is gas.


Related Questions


A bag weighing 20 N is pushed horizontally a distance of 35 m across a
level floor by a force of 10 N, How much work is done on the bag in
Joules? W=Fd *

Answers

Answer:

350J

Explanation:

Given parameters:

Weight of bag  = 20N

Distance moved horizontally  = 35m

Force applied  = 10N

Unknown:

Work done on the bag  = ?

Solution:

Work done is the force applied to move a body through given distance.

  Work done  = Force applied x distance

So;

 Work done  = 10 x 35  = 350J

HELP PLS 100 POINTS TAKING TEST RN


Suppose you are in a car that is going around a curve. The speedometer reads a constant 30
miles per hour. Which of the following is NOT true?

You and the car are accelerating.

Your speed is constant.

Your velocity is constant.

Your acceleration is constant.

Answers

Answer:

sorry I hate when people press your question and answer with a fake answer for points, however you said it was 100 points and it's not even close lol but it is "your speed Is constant" that is not true

Tafu is working with subatomic particles in the physics lab. a positron is traveling in a straight line down the particle accelerator. tafu models its position with the function p(t)= t2 t â 1 where t>1. in the limit calculations below, if you need to use -â or â, enter -infinity or infinity. (a) calculate the limit

Answers

Answer:

Infinity

Explanation:

When you have a limit approaching infinity one method you can use is to remember that the highest power dominants all of the other ones so when we have (t^2)/t-1 like in your problem, we see that t^2 has the highest power of 2 so if that's going to infinity and it's not being divided by any powers higher than it will just be inifinity.

We have that for the Question, it can be said that  in the limit calculations below, if you need to use -â or â, enter -infinity or infinity. the limit is

[tex]Lim_{t->\infty} p(t)= \infty[/tex]

From the question we are told

Tafu is working with subatomic particles in the physics lab. a positron is traveling in a straight line down the particle accelerator.

tafu models its position with the function

p(t)= t2 t â 1 where t>1.

in the limit calculations below, if you need to use -â or â, enter -infinity or infinity.

(a) calculate the limit

Generally the equation for the Question  is mathematically given as

[tex]p(t)=\frac{t^2}{t-1}\\\\Therefore\\\\For Lim_{\infty}\\\\We have\\\\ Lim_{t->\infty} p(t)= Lim_{t->\infty}\frac{t^2}{t-1}\\\\[/tex]

Since, the equivalent degree of numerator (t^2) is greater than that of the denominator

[tex]Lim_{t->\infty} p(t)= \infty[/tex]

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please help!!! 50 POINTS
1) The diagram below models the energy involved in a reaction that changes methane gas and oxygen into carbon dioxide and water.

The graph shows a certain level of energy of reactants C H2 + 2 O2, which increases on the breaking of bonds as the atoms are separated. The energy is then consumed when the making of bonds decreases the energy of products, C O2 + 2 H2 O, to a level much lower than the energy of reactants. The energy change of negative delta H depicts the exothermic reaction.

Which observations about the energy released in making the bonds are correct?
a) It is greater than the energy absorbed in breaking the bonds. The excess is converted to chemical energy.
b) It is greater than the energy absorbed in breaking the bonds. The excess is converted to thermal energy.
c) It is less than the energy absorbed in breaking the bonds. The excess is converted to thermal energy.
d) It is less than the energy absorbed in breaking the bonds. The excess is converted to chemical energy.

2) Carbon dioxide is an example of a molecule where the component atoms of carbon and oxygen are held together by chemical bonds. Which statement correctly describes the reason for these chemical bonds?
a) The nuclei and electrons of the atoms are attracted to each other.
b) The strong nuclear energy bonds the atoms together.
c) The combination of chemical energy stored in each atom makes the bonds strong.
d) The structure of atoms increases their atomic energy, which creates the bonds.

3) When burning fuel for cooking, the pan and the food absorb energy and heat up. In this process, which form of energy is chemical energy converted into?(1 point)
a) thermal energy
b) atomic energy
c) mechanical energy
d) radiant energy

4) Which of the following statement/s about the energy involved in a chemical reaction is/are correct?
I. The energy stored in chemical bonds is kinetic energy.
II. The total energy is conserved during a chemical reaction.
III. Chemical energy can be converted to other forms of energy.
IV. Energy is needed to both break bonds and form new bonds.
a) III and IV only
b) II and III only
c) II, III, and IV only
d) I only

5) Burning coal results in several energy transformations to generate electricity. Which statement is correct about the chemical energy stored in chemical bonds between atoms when coal is burned?
a) It allows the bonds to form and then break.
b) It helps transform kinetic energy to potential energy.
c) It increases the number of atoms.
d) It converts to thermal energy.

thank you!!

Answers

Answer:

Explanation:

1. It is greater than the energy absorbed in breaking the bonds. The excess is converted to thermal energy.

2. The nuclei and electrons of the atoms are attracted to each other

3. thermal energy

4. II and III only

5. It converts to thermal energy.

A frictionless pulley system connects a 150 Kg block of a flat surface with a coefficient of friction of 0.20 to a hanging 200 kg block. Determine the tension on the cord, the frictional force of the block on the surface, acceleration of descending block, and time required for a hanging block to full 10 meters.

Answers

Cuáles son los dos tipos de lípidos que se pueden encontraren la sangre

Most electricity comes from the burning of
A. Fossil fuels B. Trash C. Wood D. None of the above

Answers

Answer:

(A) Fossil Fuels

Answer:

Fossil Fuels

Explanation:

That’s what CK12 told me

how much energy must be absorbed by water with a mass of 0.5kg in order to raise the tempature from 30c to 65c

Answers

Answer:

62760J

Explanation:

Given parameters:

Mass  = 0.5kg  = 500g

Initial temperature  = 30°C

Final temperature  = 65°C

Unknown:

How much energy is absorbed by the water  = ?

Solution:

To solve this problem, we use the expression below:

  H  = m C Δt

  H =  m  x C x (t₂ - t₁ )

m is the mass

C is the specific heat  = 4.184J/g°C

t₂ is the final temperature

t₁ is the initial temperature

So;

              H  = 500 x 4.184 x (65  - 30) = 62760J

An elephant kicks a 2.5 kg rock that is initially at rest. The

net force on the rock varies with time as shown below.

What is the rock's change in momentum between 0 ms

and 20 ms?

Answers

0.20Answer:

Explanation:

Which is a unit of momentum?

A) N-m/s
B) kg-m/s
C) kg-m/s2
D) N-m/s2


please hurry i need help asap, will mark brainliest

Answers

Answer:

unit of momentum is kgm/s2

The unit for momentum can be Newton-second (Ns). In the CGS system, if the mass is in grams and the velocity in centimeters per second, then the unit of momentum will be gram-centimeters per second (g⋅cm/s).

What is momentum ?

"Momentum, product of the mass of a particle and its velocity. Momentum is a vector quantity; i.e., it has both magnitude and direction. Isaac Newton's second law of motion states that the time rate of change of momentum is equal to the force acting on the particle. See Newton's laws of motion."

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2. Which animal is a primary consumer in the Ethiopian Highlands?
walia ibex
tiger
black lion
prairie dog

Answers

Answer: Wallia Ibex

Explanation: Black lions and tigers are not primary consumers. However, the Wallia Ibex is a primary consumer, hope it helps :D.

Which part of the electromagnetic spectrum is typically used to make images based on the temperatures of objects?

X-rays
radio waves
infrared light
visible light

Answers

Answer:

Which part of the electromagnetic spectrum is typically used to make images based on the temperatures of objects?

X-rays

radio waves

infrared light<<<----- CORRECT

visible light

Explanation:

Edge 2021

Infrared light is typically used to make images based on the temperatures of objects.

What is meant by electromagnetic spectrum?

The range of all EM radiation arranged from high to low frequency (short to long wavelength) according to their frequency or wavelength. is known as the electromagnetic spectrum (EM).

Here,

Similar to visible light, X-rays are a type of electromagnetic radiation. X-rays have a higher energy than light, on the other hand, and can penetrate most materials, including the human body.

Images of inside body tissues and structures are produced using medical x-rays.

Electromagnetic energy in the infrared region of the spectrum can be seen by them. There is a relationship between an object's temperature and the electromagnetic radiation it releases since infrared radiation is strongly related to object temperature.

Hence,

Infrared light is typically used to make images based on the temperatures of objects.

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Which equation should be used to calculate the speed of a wave?

speed = frequency x wavelength
speed = frequency x hertz
speed = period x wavelength
speed = period x hertz

Answers

The equation should be used to calculate the speed of a wave is speed = frequency x wavelength.

What is the formula for wave speed?

The speed of a wave is calculated by the equations: V = λ . f or V = λ/T, and the unit of measurement is m/s. This speed depends on the medium: in gaseous media, the speed is lower than in solid media.

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The equation should be used to calculate the speed of a wave is speed = frequency x wavelength.

What is Speed of wave?

Wave speed is the movement of a progressive wave, which is an energy-moving disturbance that takes the shape of an oscillation and moves from one place to another.

The wavelength and frequency of a wave both affect its speed. A wave's speed is a crucial factor because it enables us to estimate how quickly the wave will disperse in the medium, which is the substance or material that will carry it.

This is the water in the case of ocean waves and the air in the case of sound waves. The kind of wave and the physical properties of the medium in which it is flowing also affect a wave's velocity.

Therefore, The equation should be used to calculate the speed of a wave is speed = frequency x wavelength.

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What happens when stress builds up at faults?

A. Energy is absorbed
B. Rock can bend and break
C. Plates form on the lithosphere
D. earthquakes develop at earths surface

Answers

Answer:

The answer is D because when the faults move that is the tectonic plates moving. So earth quakes will be forming when the fault moves.

Explanation:

AB just took the test

How does the sun maintain its high temperature and energy output?

Answers

Answer:

The core of the sun is the region that extends from the center to about 20–25% of the solar radius. It is here, in the core, where energy is produced by hydrogen atoms (H) being converted into nuclei of helium (He). ... The core is the only part of the sun that produces an appreciable amount of heat through fusion.

Explanation:

I got you

By not running out of fuel (Hydrogen).

Rest assured ... When the sun runs low on Hydrogen, it'll go through several complex changes, and it'll end up at much much lower temperature, with much much lower energy output.

PLEASE HELPPPPPPPPPP I WILL GIVE YOU BRAINLIEST Catalina's class wants to determine if boys or girls recycled more paper each day. They set up separate recycling bins in the classroom and labeled them "Boys" and "Girls." The students then placed their paper items in the correct bins. Which of the following should the students do each day before emptying the bins?

Answers

Answer:

what are the answer choices

Explanation:

i dont know the choices so i say count the stuff they recycle, and add the score to the days before.

A 7.20x10^3 N spacecraft travels away from the Earth. What is its weight when it is a) 6.38×10^3 km
and b) 1.28x10^4 km from the surface of the Earth?

Answers

Answer:

1,252

Explanation:

The time for a sound wave to travel between two people is 0.80 s,
The people are 256 m apart
Calculate the speed of sound in air.

Answers

Answer:

Explanation:

Using the below formula

Speed of sound = ( distance between observers) *2/(total time taken)

Now putt the given values ,

time taken = 0.80 sec

distance = 256 m

hence

V of sound= 256*2/0.80

V of sound = 640 m/sec

Which is a disadvantage of storing data digitally?
A.The parts of devices that store data are unstable compared to analog storage.
B. Other people can access personal data when a virus is copied with the data.
C. Noise makes digital data unreliable when copied.
D. The quality of copies stays the same as more copies are made.

Answers

Answer:

I thinks it’s b sorry if it didn’t help

Explanation:

One of the disadvantage of storing data digitally  is that,  other people can access personal data when a virus is copied with the data. Hence, security of data cannot be ensured.

What is digital storing?

Nowadays there are many technological ways to store our credentials and essential documents. These data can be stored in virtual space such as in computers phones like electronic gadgets.

Compared to the conventional storage methods or paper format, digital storage is easy and fast easily accessible from anywhere in any format and can be shared. These data cannot damaged as paper document.

However, the digital storing have some drawbacks. Sometimes these data goes insecure and other people can access personal data when a virus is copied with the data.

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I had to show a screenshot of this because brainly thinks it detects a bad word​

which statements describe kinetic and potential energy? check all that apply.

Answers

Answer:

ACDE

Explanation:

Energy is generally described as the ability to do work by a body. There are two main forms of energy which are the kinetic energy and the potential energy.

Other energy forms stems from these two energy types.

Potential energy expressly deals with the position of a body. It is mathematically given as:

             Potential energy  = mass x acceleration due to gravity x height

It is the energy stored based on the position of particles within a medium

These description satisfies options A, C

Kinetic energy is the energy due to the motion of body. It is mathematically given as:

             Kinetic energy  = [tex]\frac{1}{2}[/tex] x mass x velocity²

Also, kinetic energy is directly proportional to the velocity of a body.

The description satisfies DE

Billy is driving a bumper car for 5 minutes. In this time, Billy crashes into three other cars.

The first car is carrying another small child, the second is carrying a large adult, and the third is empty. Each car is sitting still when Billy hits it at full speed. Place the crashes in order of how much force Billy feels, from smallest to largest.

empty car
large adult
small child
<

Answers

Answer:Its empty car, small child, and then adult.

Explanation:

i took it

Answer:

Its empty car, small child, and then adult.

What is the action and reaction if a person takes a step back

Answers

Answer:

action is backward and i guess reaction is sad

Martha, a first-grade teacher, is worried that if doesn't stay In at work to grade papers her principal will think she is lazy She is also worried that if she stays late at work her partner will be angry. This of conflict is known as

Answers

The type of conflict Character vs self

Answer:

Character vs self

Explanation:

The reason is because Martha is thinking to much about the negative things and it is making her feel like she is fighting her own body for control.

II. What examples can you find in your home that are examples of kinetic and potential energy (name two for each type
of energy)?
11. Kinetic:
12. Kinetic:
13. Potential
14. Potential:

Answers

Answer:

11. A door accelerating when pushing it.

12. A person sliding along the floor.

13. Water dropping from the faucet.

14. Courtains descending when loosening them.

Explanation:

For kinetic energy, any example that does not move horizontally will do. Something accelerating or decelerating is a good example (Ek=1/2mv^2, where v is velocity).

For potential energy try to think of things moving vertically. Potential energy comes from the height of an object (Ep=mgh, where h is height).

Notice that example 13 and 14 represent potential energy turning into kinetic energy, height becomes lower, so velocity increases.

Is gravitational energy a form of kinetic energy or potential energy? Why do you think that?

Please help due today!!​

Answers

Answer:

When something is lifted, work is done on the object against the pull of gravity. This work is converted to a form of potential energy called gravitational potential energy. When the item falls towards Earth like an apple from a tree, gravitational potential energy is converted into kinetic energy.

Give an example of speed making a difference in the amount of kinetic energy. Tell how you know that kinetic energy amount is different in your example.

Please help this is due today

Answers

Answer:

1. A car moving 40 mph has four times as much kinetic energy as one moving 20 mph, while at 60 mph a car carries nine times as much kinetic energy as at 20 mph. Thus a modest increase in speed can cause a large increase in kinetic energy.

PLZ MARK BRAINLIEST THANK AND FIVE STAR:)

Answer:

a car moving 40mph has four times as much kinetic energy as one moving 20 mph, while at 60 mph a car carries nine times as much kinetic energy as at 20 mph.

if you need any more info just dm me

When we stretch a spring, which two factors affect how much elastic
potential energy is stored in it

Answers

mass and gravitational field

Find the electric field E⃗ (r⃗ )E→(r→)E_vec(r_vec) inside the sphere (for rrr< aaa) in terms of the position vector r⃗ r→r_vec. Express your answer in terms of r⃗ r→r_vec, rhorhorho (Greek letter rho), and ϵ0ϵ0epsilon_0.

Answers

Solution :

Using the Gauss law, the electric field intensity of a sphere is given by :

[tex]$E. 4 \pi r^2 = \frac{Q_{enc}}{\epsilon_0}$[/tex]

[tex]$E = \frac{Q_{enc}}{4 \pi r^2 \epsilon_0}$[/tex]

Now the enclosed charge inside the sphere (r<a) is

[tex]$Q_{enc}= \rho V$[/tex]

[tex]$Q_{enc}= \rho \left( \frac{4}{3} \pi r^3 \right)$[/tex]

Hence, the electric field intensity becomes as follows :

[tex]$E= \frac{\rho \left(\frac{4}{3} \pi r^3\right)}{4 \pi \epsilon_0 r^2}$[/tex]

[tex]$E =\frac{\rho r}{3 \epsilon_0}$[/tex]

Thus, the electric field inside the sphere is given by :

[tex]$\vec {E} = \frac{\rho \vec{r}}{3 \epsilon_0}$[/tex]

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A car is traveling north on the interstate. They cover 645 miles in 9 hours. What is the car's average velocity? ​

Answers

123465798012345678901243567980

Answer:

ycuvivxuduviguv8vifudsyfucuv

If an ice cube with the mass of 5.0 grams melts in a closed system such as closed glass jar, what is the mass of the liquid water after the ice cubes completely melts?


A) 4.0 grams

B) 5.0 grams

C) 6.0 grams

D) The mass cannot be determined without knowing the volume.

Answers

Answer:

4.0 grams

Explanation:

Answer:

B) 5.0 grams

Explanation:

Its right

examine this diagram of the human heart. what is the structure indicated by the arrow?

I unfortunately can't post a picture because I am uploading this question from my computer but I will do my best to describe the image.
It's a normal picture of a human heart, but there is an artery going down and there is an artery going to the right, I need the name of the artery going to the right because that is what the arrow is pointing at.

A. The Pulmonary Artery
B. The Pulmonary Vein
C. The Superior Vena Cava
D. The Aorta

Answers

Answer:

Right coronary artery

Explanation:

Right coronary artery (RCA). The right coronary artery supplies blood to the right ventricle, the right atrium, and the SA (sinoatrial) and AV (atrioventricular) nodes, which regulate the heart rhythm.

Answer:

A.) Pulmonary artery

Explanation: Someone told me Aorta and i got it wrong....

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Polygon ABCD has the following vertices:A(4, 2), B(3, 2), C(3, 5), and D(4, 2)Calculate the area of the polygon. 28 units squared 38.5 units squared 40.5 units squared 49 units squaredget it right because i can check and i'll not give you brainlyest:) A vertical piston-cylinder device contains a gas at a pressure of 100 kPa. The piston has a mass of 10 kg and a diameter for 14 cm. Pressure of the gas is to be increased by placing some weights on the piston. Determine the local atmospheric pressure and the mass of the weights that will doublethe pressure of the gas inside the cylinder. 40.8-10 to the power of 2 Elisa is saving an equal amount each week for 8 weeks to buy a video game that costs $40. How much is she saving each week? A $4B $5C $32 D $48Jesse chose C as the correct answer. How did he get that answer? I will give the BRAINIESTSimplify. Write your answer in standard form.(4x^3+6x-7)+(3x^3-5x^2-5x+9) A jar is filled with pennies, nickels, and dimes. The probability of picking a penny is 1/4, and the probability of picking a dime is 1/3. What is the probability of picking a nickel? Write your answer as a decimal rounded to the hundredths place. Why are minority rights important in diverse regions?A. Diverse regions tend to have many minority groups.B. Ethnic groups tend to be the majority.C. Minority rights are usually only upheld in dictatorships.D. Majority groups tend to look out for minorities. A particular term in an atom in which LS coupling is a good approximation splits into three levels, each having the same L and same S but different J. If the relative spacings between the levels are in the proportion 5:3, find L and S. Choose the word or phrase that best matches the word in italics.He shouted, "That is preposterous!" when she told him what happened.A. ridiculousB. impossibleC. reasonableD. spectacular ANSWER TO 4 AND 5 PLEASE ASAP Please help me ASAP 6+5 x 2 +5+ = 67 +84 - 12 x 4 = 16 A sprinter starts from rest and accelerated at a rate of 0.16 m/s over a distance of 50.0 meters. How fast is the athletes traveling at the end of the 50.0 meters? How many groups of 10 are in 60? Which of the following is entirely within the control of Native Americans on their reservation? A. the usage of irrigation water on tribal lands B. the right to wage war on neighboring tribes or states . the creation of a tribal government with representatives selected by the tribe the right to sell or lease tribal land without informing the federal government Please select the best answer from the choices provided 2. What is Washington warning against in the following excerpt "In contemplating the causes which may disturb our Union, it occursas matter of serious concern that any ground should have been furnished for characterizing parties by geographicaldiscriminations, Northern and Southern, Atlantic and Western; whence designing men may endeavor to excite a belief that there isa real difference of local interests and views"? . Slavery.SectionalismForeign alliancesD.Political parties 1. What are the parts of a stream? Find the length AB ? The Jordan's Michael wanted were on sale for 20% off. The original price of the sneakers is $185.00. How much is the sale? Show your work (GIVING BRAINLYIST) 3 pizzas are shared equally between 10 people. what fraction of a pizza does each person receive. show your work on a image or on paper with using fraction models! thank you for your help :D