CHEMISTRY HIGH SCHOOL

Explanation of atomic radius​

Answers

Answer 1
Answer:

Ah yes.

The atomic radius is basically the distance between the nucleus of the atom and the outermost electron in the farthest orbital of the atom. The more bigger the atomic radius , the less powerful is the force that holds together the nucleus and its electrons.

Related Questions

Which of the following is a TRUE statement?a.A molecule always has three types of elements presentb.Compounds always include the elements hydrogen and sodiumc.Compounds include things we use in our everyday livesd.All elements prefer to hang out with other elements and form molecules
Why are units used that are to express the densities of gases different from those used to express the densities of solids or liquids
What kind of elements form covalent bonds?
An effective collision between reactant particles requires the particles to have the proper what?
Which element is least likely to undergo a chemical reactionA) lithiumB) carbon C) flourineD) neon and can you give me a explanation with the answer you chose

Which equations shows the complete dissociation of a strong base?

Answers

The correct answer is the fourth option. The complete dissociation of a strong base is BOH + h20 -> B+ + OH- + H20 since this is the only base from the choices given. A base is a substance that accepts hydrogen ions. 

1.09 L of a gas at standard temperature and pressure is compressed to 374 ml. what is the new pressure of the gas?

Answers

This can be solved using the equation PV = nRT, but there is an easier way using Boyle's Law. This law states that the product of pressure and volume are constant in a system with constant temperature. This means that we can set the product of initial pressure and volume equal to the final pressure and volume. Maybe you have seen this equation as P1V1 = P2V2.  We know that temperature is constant at 0 degrees Celsius (or 273.15 K), and that the initial pressure is standard at 1 atmosphere (atm). This means our knowns are:
P1 = 1 atm    V1 = 1.09 L    V2 = 0.374 L (from 374 mL)
Plug these into the Boyle's Law equation P1V1 = P2V2:
(1 atm)*(1.09 L) = (P2) * (0.374 L)
(1 atm)*(1.09 L)/(0.374 L) = P2
P2 = 2.91 atm

Endorphins are generated in the body during exercise, which leads to better emotional health. Please select the best answer from the choices provided.a. True
b. False

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Answer: Yes the statement is true.

Explanation: Endorphins are chemicals produced by the human bodies to relieve stress and pain.

They are produced mainly by brain and help to transmit electrical signals within nervous system, thus are called as neurotransmitters.

They are also called as "feel good chemicals" as they can act as pain relievers and happiness booster and thus lead to better emotional health.

Endorphins are generated in the body during exercise, which leads to better emotional health. This statement is TRUE.

Further explanation

Endorphins are chemicals produced by the body to relieve stress and pain. This chemical works similarly to a class of drugs called opioid. But because endorphins release naturally by the body it is a safer way to relieve stress and pain.  

Exercise boosted mood and powerful depression fighter for several reasons. Through exercise, you are not only gain your physical fitness but it also gives you an enormous sense of well being. You feel more energetic, positive, sleep well and  have better memory. Exercise can also serve as a distraction from negative thoughts and activities that feed depression.

Regular exercise is important to maintain a healthy body and mind. The recommended amount and intensity of physical activity varies according to ages and health condition. For an adult, the recommended time is 150 minutes per week for a moderate-intensity activity or 75 minutes per week for vigorous-intensity activity, or a combination of these two activities. You can break this into 25 minutes a day for 3 days a week.

Learn more

Aerobic exercise and endorphins brainly.com/question/4349107

Endorphins brainly.com/question/890846

Regular exercise brainly.com/question/3122325

Keywords: endorphins, regular exercises, stress, and anxiety reliever

In a closed container, the vapor pressure of 10 mL of ethanol at 20 degrees C is 5.85 kPa. What is the vapor pressure of 20 mL of ethanol at the same temperature?

Answers

Answer:

{P_2}=2.925\ kPa

Explanation:

At same temperature and same number of moles, Using Boyle's law  

{P_1}* {V_1}={P_2}* {V_2}

Given ,  

V₁ = 10 mL

V₂ = 20 mL

P₁ = 5.85 kPa

P₂ = ?

Using above equation as:

{P_1}* {V_1}={P_2}* {V_2}

{5.85\ kPa}* {10\ mL}={P_2}* {20\ mL}

{P_2}=\frac{{5.85}* {10}}{20}\ kPa

{P_2}=2.925\ kPa

Scientific notation for 5,098,000

Answers

When you do not see the decimal just put it at the very end of the problem! 
So now 5,098,000.
Now we need to move the decimal over to make this problem greater than 1 and less than 10. So if we but the decimal Right after 5 we have 5.098 which is greater than 1 and less than 10.
So now we write it out like this
5.098*10^x
let's find x.
X is how many times we moved the decmal over, in this case 6.So now
5.098*10^6
Does this help?
5.098*10^6    , this is the correct answer
                                                         

A 1.0 liter container is filled with 0.300 M ofPCl5 at 250◦C. The vessel is then held at a
constant temperature until the reaction
PCl5(g) ⇀↽ PCl3(g) + Cl2(g)
comes to equilibrium. It is found that the
vessel contains 0.200 moles of PCl5. What is
the value of the equilibrium constant for the
reaction at this temperature?

Answers

If there is 1.0 liters of 0.300 M at the beginning, that means there was 0.300 moles (because 1 L times 0.300 moles/L = 0.300 mol).  It says that, at equilibrium, there is 0.200 mol PCL5.  That means 0.100 mol PCl5 reacted.  Therefore, 0.100 mol each was created of PCl3 and Cl2.

Equilibrium constant Kc can be found with this:
K_c= (concentration\ of\ the\ products)/(concentration\ of\ the\ reactants)\nK_c=([PCl_3][Cl_2])/([PCl_5])=((0.100)(0.100))/((0.200))=0.0500
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