Answer:
Electron shielding is when the inner electrons shield the outer electrons from the full force of the nucleus
What is the molarity of a solution prepared by diluting 43.72 ml of 1.005 M aqueous K2CR2O7 to 500 ml
Answer:
43.72
Explanation:
that is the answer hope u liked it and I did this already along time ago
The molarity of the solution will be "0.088 M".
Given values are:
Volume,
[tex]V_1 = 43.72 \ ml[/tex][tex]V_2 = 500 \ ml[/tex]Molarity,
[tex]M_1 = 1.005 \ M[/tex][tex]M_2 =?[/tex]By using the Dilution principle, we get
→ [tex]M_2 = \frac{M_1 V_1}{V_2}[/tex]
By substituting the given values, we get
→ [tex]=\frac{1.005\times 43.72}{500}[/tex]
→ [tex]= \frac{ 43.9586}{500}[/tex]
→ [tex]= 0.088 \ M[/tex]
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ILL GIVE BRIANLY, FOLLOW , 5 STARS AND HEARTS
a bimetallic strip in a thermostat works on the idea that..
Answer:
it can help heat or cool a room.
Explanation:
I think this is right...
25 pts
3. Describe the subatomic structure of the nucleus, including the structure of each nucleon. Draw a picture.
Describe the forces that hold the nucleus together and draw them on your diagram.
Explain how beta emission works
Answer:
2 circles one proton and one nucleon.draw quarks within each. strong nuclear force within protons between quarks and residual strong force between proton and nucleon (up,up,down in proton)
Explanation:
If a neutral atom with 88 electrons undergoes 2 rounds of beta minus decay, what will be the new element?
Answer:
The new element will be thorium-226 (²²⁶Th).
Explanation:
The beta decay is given by:
[tex] ^{A}_{Z}X \rightarrow ^{A}_{Z+1}Y + \beta^{-} + \bar{\nu_{e}} [/tex]
Where:
A: is the mass number
Z: is the number of protons
β⁻: is a beta particle = electron
[tex]\bar{\nu_{e}}[/tex]: is an antineutrino
The neutral atom has 88 electrons, so:
[tex] e^{-} = 88 = Z [/tex]
Hence the element is radium (Ra), it has A = 226.
If Ra undergoes 2 rounds of beta minus decay, we have:
[tex] ^{226}_{88}Ra \rightarrow ^{226}_{89}Ac + \beta^{-} + \bar{\nu_{e}} [/tex]
[tex] ^{226}_{89}Ac \rightarrow ^{226}_{90}Th + \beta^{-} + \bar{\nu_{e}} [/tex]
Therefore, if a neutral atom with 88 electrons undergoes 2 rounds of beta minus decay the new element will be thorium-226 (²²⁶Th).
I hope it helps you!
PLEASE HELP A car burns gasoline to create hot air gas that expands to move the pistons in the engine, which causes the car to be able to move.
What energy transformations occur from the fuel to the movement of the car?
Thermal to mechanical
Thermal to chemical to mechanical
Chemical to thermal to mechanical
Chemical to electrical
Answer:
Chemical to thermal to mechanical
Explanation:
It is because gasoline is chemical energy which turns to thermal. Because it said hot gas which is thermal energy. Then it turns to mechanical for the car to even move.
All seeing eyes:
i know your answer it is the third one (C, chemical to thermal to mechanical)
Explanation:
my all seeing eyes know all the answers
A 55.0 kg runner who weights 539.0 N is accelerating at 3.2 m/s. After 2 seconds, she reaches a speed of 6.4 m/s. What is her momentum at this point?
Answer:
352kg.m/s
Explanation:
Momentum is the product of mass and velocity. Momentum is a vector quantity. Momentum is the measurement of an object in motion thereby showing how much of the object is in motion. The formula of momentum (p) is given as:
p = mass * velocity
Given that the runner has mass of 55 kg, the momentum at a speed of 6.4 m/s is:
Momentum = mass * velocity = 55 * 6.4 = 352kg.m/s
Answer:352
Explanation:
7. Think and discuss: As you move down a group, you will recall that the radius increases.
Why do you think an increase in atomic radius would result in a lower
ionization energy?
8. Think and discuss: As you move across a period, you will recall that the radius decreases.
Why do you think a decrease in atomic radius would result in a greater ionization energy?
9. Predict: Electron affinity (EA) refers to the energy released when an electron is added to
an atom. This release of energy is always expressed as a negative value. The greater the
magnitude of the negative value, the greater the attraction for electrons. (An EA of -100
kJ/mol would indicate a stronger attraction for electrons than an EA of -50 kJ/mol.)
How do you think the size of an atom will affect its ability to attract additional electrons?
Answer:
See explanation
Explanation:
7. As we move down the group more shells are added. The addition of more shells means that the atom becomes larger and the outermost electron is now at greater distance from the nucleus and screening effect becomes very important. This greater screening effect of the inner electron reduces the magnitude of effective nuclear charge on the outermost electron thereby lowering the ionization energy.
8. As we move across the period, the effective nuclear charge increases without a corresponding increase in the number of shells. As a result of this, the outermost electron becomes more tightly bound to the nucleus as the atom becomes smaller and atomic radius decreases causing a rise in the ionization energy from left to right across a period.
9. Actually, the smaller an atom is the greater its electron affinity. The smaller the atom is, the more the outermost shell is drawn closer to the nucleus and this means that the atom is better able to attract electrons to itself.
It is due to the size of atom which varies its force of attraction.
As you move down a group, the atomic radius increases due to addition of more number of shells in an atom. This increase in atomic radius would result in a lower ionization energy because the valance electron is farther from the nucleus and held with weak attractive force so less energy is required to remove it.
While on the other hand, as we move from left to right in a periodic table the atomic radius decreases due to addition of more electrons which shrinks the atom and brought the valance shell closer to the nucleus so it becomes harder to remove an electron because the nucleus held these electrons very tightly.
The size of an atom will affect its ability to attract additional electrons because of its force of attraction. Atoms with small radius has more ability to attract electrons due to higher force of attraction as compared to higher atomic radius atoms.
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Explain how the reaction of a flame to carbon dioxide is different from the reaction of a flame to hydrogen in terms of cause and effect.
Answer:
Explanation: Combustion that results in a flame is very fast and is called burning. Combustion can only occur between gases. Fuels can be solids, liquids or gases. During the chemical reaction that produces fire, fuel is heated to such an extent that (if not already a gas) it releases gases from its surface. Only gases can react in combustion.
The difference in the reaction of a flame to carbon dioxide and reaction of the flame to hydrogen in terms of cause and effect has been explained below.
For a flame to light, it needs the presence of oxygen for a combustion reaction.
Now, for a flame in carbon dioxide; since Carbon (IV) oxide's molecules are heavier than the molecules of air, it means that they push out the oxygen molecules and others in the air and as a result it's now the carbon dioxide gas that will be hovering over the flame directly. Since oxygen which is the primary element for combustion is missing, it means the flame cannot react with it anymore and as such the flame will go off.
Whereas, for a flame in hydrogen; since hydrogen is lighter than air, it means it does not displace the oxygen that is making the flame to burn and as such instead will react with the oxygen to form water and release energy. But when ignited by the flame, it mixes with the air to form an explosion.
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All matter has
A. has mass
B. is atteacted to all other matter
Answer:
a
Explanation:
Help!!
What is the concentration of an unknown with an absorbance of 0.4 using the plot?
Answer:3,4,1,2
Explanation:
hope this helped
Help! I am in a hurry! Will get brainliest if correct!
Answer:
Distillation
Explanation:
that's it
help!!!!?????????? plssssssss
Answer: it’s b)
Explanation: that’s the only difference that is listed
Answer:
I think it is B
Explanation:
Which force is stronger? 40 N → or ← 4.218 Newtons
Answer:
40 Newtons
Explanation:
4.218 is not even close to 40 N.
The 40 N force must be the larger force because 40 has a larger magnitude than the 4.218.
Magnitude of a force?
The term magnitude has to do with how large the force is. The larger the force the larger the value that is mentioned.
This implies that the 40 N force must be the larger force because 40 has a larger magnitude than the 4.218.
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Potassium (K) and copper (Cu) are both in period 4. They both have _____.
four electron shells
similar properties
the same number of electrons
the same number of protons
Answer:
Similar properties
Explanation:
Potassium (K) has atomic number 19 which means its electron configuration (pattern of electrons in it's energy levels (electron shells)) is 2·8·8·1 while Copper (Cu) has atomic number 29 which means its electron configuration is 2·8·8·8·3 hence Potassium has 4 electron shells while Copper has 5
Potassium has 19 protons (from its atomic number) while Copper has 29 protons
The number of protons and electrons is usually the same (in an atom) (that's why atoms don't naturally have charges i.e they're usually neutral) so Potassium has about 19 electrons while Copper has about 29 electrons.
So similar properties automatically becomes your answer cuz the rest are wrong.
helppp mehhh thanks:))
Answer:
natural gas
Explanation:
your welcomeee
Which one does Temperature measure
A. how many particles there are.
B. how fast the particles are moving.
C. how tightly packed the particles are.
D. how large the particles are.
Answer:
B. how fast the particles are moving
Explanation:
Temperature measures the average kinetic energy of system as result of the thermal - heat energy present in the reaction or a body.
Often times, temperature is the degree of hotness or coldness of a body and this translates to an increase or decrease in the molecular speed.
Number of particles in a body is the mass of the body. How tightly packed the particles are corresponds to the density of the body.The reaction for the combustion of acetylene is shown. Explain why this reaction is a redox reaction by identifying the oxidation numbers that change, what is oxidized, what is reduced, and what happens to the electrons during the reaction. 2C2H2 + 5O2 → 4CO2 + 2H2O
Answer:
2 C2H2 (g) + 5 O2 (g) → 4 CO2 (g) + 2 H2O (l)
Explanation:
Redox reaction: In this type of reaction, oxidation and reduction reaction occurs simultaneously in same chemical reaction.
2C_2H_2+5O_2\rightarrow 4CO_2 + 2H_2O2C
2
H
2
+5O
2
→4CO
2
+2H
2
O
This reaction is a redox reaction :
Removal of hydrogen or addition of oxygen is termed as oxidation. in above reaction, removal hydrogen from acetylene gives carbon-dioxide.
Removal of oxygen or addition of hydrogen is termed as reduction. in above reaction, removal of one oxygen atom from oxygen molecule with addition of two hydrogen atoms gives water
The oxidation number of carbon in acetylene is -2.
The oxidation number of carbon in carbon-dioxide= +4
Oxidation number of carbon increases after the reaction which means that carbon is getting oxidized.
The oxidation number of oxygen in oxygen gas = 0
The oxidation number of oxygen in water = -2
Oxidation number of oxygen decreases after the reaction which means that oxygen is getting reduced.
The electrons released during oxidation are transferred to the species which are undergoing reduction reaction.
Answer:
Just put this, or something like it:
The oxidation number of carbon changes from -1 to +4.
The oxidation number of oxygen changes from 0 to -2.
Carbon is oxidized.
Oxygen is reduced.
Electrons are transferred from carbon to oxygen.
Explanation:
What type of bond (Ionic, Covalent or Metallic) would be created when carbon bonds with bromine?
Answer:
Covalent bond
Explanation:
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A student cut out a spiral shape from a piece of tissue paper and hung it from a string over a light bulb. Nothing happened. Next the student turned on the light. After a few seconds, the spiral began to turn above the light. Which of these best explains what happened?
Answer:
See explanation
Explanation:
Initially, when the paper is hung over the light bulb, we observe that nothing happens at all.
As time goes on, air surrounding the lamp begins to heat up. Remember that hot air is lighter and less dense than cold air. Air surrounding the lamp which has now become hotter and less dense rises and pushes on the spiral. This causes the spiral to begin to spin.
can anyone help me with this problem :)
The formula of ascorbic acid (vitamin C) is C6H8O6 The recommended dose is 60.0 mg. How many moles are in this dose
Answer:
0.0003 moles
Explanation:
MgC6H8O6 = (60.0mg/1)(1 mol mg/176000mg)
Do nonmetal gases have a lot or a little kinetic energy?
Yes
No
Maybe
Answer:
No they do not have a lot of kinetic energy
How do the products of chemical reactions compare to their reactants?
Question 5 options:
The products often have completely different properties than the reactants.
The products usually weigh more than the reactants.
The products usually have more atoms than the reactants.
The products are usually more toxic than the reactants.
Answer: The products usually weigh more than the reactants.
Explanation:
Answer:
A
Explanation:
i just took the k12 test
A bad case of tonsillitis can sometimes affect a person’s breathing.How is this possible ?
Answer:
Tonsillitis is inflammation of tonsils. It is caused by viral infection and very rarely by bacterial infection.
It is a very serious problem in case of children, adults and teenagers. The continuous coughing can lead to swelling in the throat which in case affects the passage of airways.
This hindered air passage can cause breathing problems. The inflammation can also affect the passage of air and affects breathing.
Explanation:
benefits and drawbacks of synthetic fuels ?
Answer:
OK hear is your answer
Explanation:
Advantages of this process are that dissolution and oil upgrading are taking place in the single reactor, products have high H:C ratio, and a fast reaction time, while the main disadvantages are high gas yield, high hydrogen consumption, and limitation of oil usage only as a boiler oil because of impurities.
plssss helppp
will mark brainliest
Answer:
high melting point
Explanation:
high melting point
Use the periodic table to write the electron configuration of selenium (Se). s s p d 1 2 3 4 6 10
Answer: 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^10 4p^4
Explanation:
I suggest looking at the electron configuration chart, it has really helped me a lot :)
Answer:
[Ar] 3d10 4s2 4p4
Explanation:
7. How many moles are in 18.00 x 1023 particles of AICIZ?
A. 2.99 moles
B. 11.98 x 1023 moles
C. 24.02 moles
D. 108.36 x 1023 moles
Answer:
The answer is option AExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\ [/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
[tex]n = \frac{18.0 \times {10}^{23} }{6.02 \times {10}^{23} } = \frac{18}{6.02} \\ = 2.99003322...[/tex]
We have the final answer as
2.99 molesHope this helps you
A motorcycle starts at rest and moves a distance of 460m .
If it has constant acceleration of 4m55 m/s2 what is its final velocity
Answer:
The final velocity of the motorcycle is 64.7 m/s
Note: Since the value for the acceleration of the motorcycle is not clear, it is assumed to be 4.55 m/s² in the calculation
Explanation:
Using the equation of motion that contains all the given values in the question: v² = u² + 2as
where v is final velocity; u is initial velocity; a is acceleration; s is horizontal distance
v = ?, u = 0 (since the motorcycle starts from rest), a = 4.55 m/s², s = 460 m
v² = 0² + 2 * 4.55 * 460
v² = 4186
take square root of both sides
v = 64.7 m/s
Therefore, the final velocity of the motorcycle is 64.7 m/s
How many moles of gas does it take to occupy 120 liters at a pressure of 2.3 atmospheres and a temperature of 340 K?
Answer:
9.9 moles
Explanation:
What we know:
P = 2.3 atm V = 120 L
R= .0821 L atm/K mol T= 340 K
What we're looking for: n = ?
2.3 atm ( 120 L) = n (.0821 L atm/K mol) (340 K)
2.3 ( 120 ) = n (.0821 / mol) (340)
276 = n (27.914 / mol )
9.9 = n / mol
9.9 mol = n
ERGENT IM TIMED!!!!!!!!!!!
Which compound forms a powerful acid and also contains a halogen? H2S HBr Li2O LiBr
Answer:
HBr is the strongest and its bond is what which makes it the strongest acid.
Explanation:
This acid is dangerous and highly poisonous than other acids. It can disunite instantly. And later then it forms the suspension.
Li_{2}OLi
2
O and LiBr is not merely an acid and henceH_{2}SH
2
S and HBr are the acids, amongst which HBr forms the strong acid component.
The strongest nature is due to the formation of hydronium ions.
The Hydrogen sulphide acid does not release hydronium ions on suspension.
Answer:
HBr is the strongest and its bond is what which makes it the strongest acid.
Explanation: