Electrons are able to "move" around the atom in set energy states in different orbitals, because the electrons "move" so fast around the nucleus where they are is just represented with an area of probability since their location and velocity cannot be measured with certainty. Protons and Neutrons are packed tightly in the nucleus held together by the strong nuclear force so they are not able to freely move.
Who was on the grand committee
Answer:
European Union was on grand committee
Answer:
European Union
Explanation:
hehe
What pH might you expect from a weak acid and a strong base if equal concentrations ?
13.5
7.0
3.2
10.4
Answer:
7.0
Explanation:
In the titration of a weak acid and a strong base, the pH or equivalence point will be greater than 7. Therefore, option D is correct.
What is pH?The pH of the solution can be described as the negative logarithm of hydrogen ions (H⁺) concentration. Mathematically, the pH value is generally inversely proportional to the hydrogen ion's concentration.
pH = -log ([H⁺])
In chemistry, the pH scale is used to determine the basicity or acidity of an aqueous solution. Acidic solutions can be calculated to have lower pH values than alkaline solutions.
The pH scale has a scale of 0 to 14 while pH 7.0 is neutral. A low pH of about 1 or 2 is acidic and a high pH of 12 or 14 is basic.
The pH value of the weak acid and a strong base solution will be greater than seven because the conjugate base of a weak acid is weakly basic. Therefore, the expected pH from a weak acid and a strong base if equal concentrations will be greater than 7 can be 10.4.
Learn more about pH value, here:
brainly.com/question/1503669
#SPJ2
help and explain how to convert it pls
Answer : The correct answer is option (3) [tex]5.68\times 10^{-19}J[/tex]
Explanation: Given,
Wavelength = 350 nm = [tex]350\times 10^{-9}m[/tex] [tex](1nm=10^{-9}m)[/tex]
Now we have to determine the energy of photon.
Formula used:
[tex]E=\frac{hc}{\lambda}[/tex]
where,
E = energy of photon
h = Planck's constant = [tex]6.63\times 10^{-34}J.s[/tex]
c = speed of light = [tex]3\times 10^{8}m/s[/tex]
[tex]\lambda[/tex] = wavelength of photon
Now putting all the given values in this formula, we get:
[tex]E=\frac{(6.63\times 10^{-34}J.s)\times (3\times 10^{8}m/s)}{350\times 10^{-9}m}[/tex]
[tex]E=5.68\times 10^{-19}J[/tex]
Therefore, the energy of photon is, [tex]5.68\times 10^{-19}J[/tex]
Gaseous mixtures ________. Question 1 options: can only contain molecules must contain both isolated atoms and molecules are all homogeneous are all heterogeneous can only contain isolated atoms
Answer:
Must contain isolated both isolated atoms and molecules
Explanation:
There is very little intermolecular forces of attraction between atoms and molecules of a gas.
Hence in a gas mixture; We mostly find isolated atoms and molecules with minimal interaction with each other, hence the answer.
Particles in a block of iron are stationary (not moving).
True
False
Answer:
False,
but it depends of the meaning of the word particle
Explanation:
even if it's a metallic bounding, or if it's very solid, has low temperature, and has a very high electrostatic force of its atoms, its particles will have some kind of movement, because it has temperature, that means that it has some kind of Agitation
Particles in a block of iron are stationary. That is true.
The particles in a block of iron are stationary depending on the temperature of the block of iron. Since the block of iron is a solid and particles of a solid tend to have low kinetic energies at low temperatures, then at low temperatures, the particles in the block of iron would be stationary.
So, Particles in a block of iron are stationary. That is true.
Learn more about block of iron here:
https://brainly.com/question/15683507
1. Which of these is always evidence of a chemical change?
A. Formation of bubbles
B. Temperature change
C. Change in color
D. Formation of a precipitate
Answer:
Explanation:
i guess change in colour
A chem 1515 student was given a solution of the cations X3 , Y2 , and Z in the form of nitrates. Through a series of tests, she obtained the following information:
Reagent X3 Y2 Z
Na2SO4 No Reaction Forms white ppt. Brown ppt. forms
NH4OH No Reaction No Reaction ppt. Dissolves
HCl No Reaction No Reaction White ppt. forms
Na3PO4 White ppt. forms No Reaction No Reaction
The reaction between Z (aq) and Na2SO4 forms a brown ppt.
Required:
Write a balanced chemical equation for all of the reactions which result in the formation of a precipitate
Answer:
[tex]2Z^+ (aq) + SO^{2-} _{4} (aq) = Z_{2} SO_{4}[/tex]
Explanation:
The reaction between Z(aq) and Na2SO4 forming a brown ppt shows that the product formed from this reaction is a solid. and also it can be seen that Z+ is a monocationic while SO4 is dianionic, hence molecules (2) of Z+ will combine with (1) molecule of SO4
below is the balanced chemical equation for this reaction
[tex]2Z^+ (aq) + SO^{2-} _{4} (aq) = Z_{2} SO_{4}[/tex]
What is the image point of (8,-2) after a translation right 5 units and up 2 units?
If the pH of a solution increases by 2 units (e.g., from 3 to 5), then the ratio of the new to the original hydronium ion concentration is
Answer:
This question is incomplete
Explanation:
This question is incomplete. However, generally hydronium ion (H₃O⁺) is produced when hydrogen ion (usually from an acid) is attracted to the negative pole of water (which is the oxygen part).
To determine the ratio in this case is simple, the ratio of the new to the original hydronium ion concentration is;
the calculate new concentration of hydronium ion, [H₃O⁺]
pH = -log[H₃O⁺] hence,
[H₃O⁺] = log⁻¹pH (meaning antilog of pH)
Kindly note that the pH to be used here is 2 + the original pH given
Hence, if the original pH given is 2
The new [H₃O⁺] will be 4
[H₃O⁺] = log⁻¹ 4
= 10000
Same formula should be used to determine the concentration of the original hydronium ion concentration using the original pH given.
Hence, [H₃O⁺] = log⁻¹ 2
= 100
The ratio of the new to the original hydronium ion concentration will be
10000:100
100:1
The ratio of the new to the original hydronium ion concentration when the pH of a solution increases by 2 is; 1: 100
The Hydroxonium ion is similar to the hydrogen ion concentration and is written as;. {H3O+¹}.
The formula for calculating the pH of a solution is;
pH = -log {H3O+¹}When the pH increases by 2 units; (e.g., from 3 to 5).
Therefore; By evaluation;
at pH = 3; {H3O+¹} = 10-³and at pH = 5; {H3O+¹} = 10-⁵.Therefore; 10-⁵/10-³ = 10-².
In essence; the ratio of the new to the original hydronium ion concentration is; 1 : 100
Read more:
https://brainly.com/question/9712853
What is the mass of Na?
2NaN3 2Na + 3N2
(500g) (?) (3235)
Options are 100 grams, 177 grams, 323 grams
Answer: 177
Explanation:
The reaction yields 177g of Na.
How to calculate the mass of Na?The balanced equation is
2NaN₃ → 2Na + 3N₂
Either use the mass of NaN₃ or of N₂ to calculate the mass of Na.
Using Mass of NaN₃By making the following conversions:
mass of NaN₃ → moles of NaN₃ → moles of Na → mass of Na
500 g NaN₃ × [tex]\frac{1 mol NaN_{3} }{65.01 g NaN_{3} }[/tex] = 7.69 mol NaN₃
7.69 mol NaN₃ × [tex]\frac{2 mol Na}{2 mol NaN_{3} }[/tex] = 7.69 mol Na
7.69 mol Na × [tex]\frac{22.99 g Na}{1 mol Na}[/tex] = 176.8 g Na = 177g of Na
Using Mass of N₂By making the following conversions:
mass of N₂ → moles of N₂ → moles of Na → mass of Na
323.20 g Na ×[tex]\frac{2 mol N_{2} }{28.01 g N_{2} }[/tex] = 11.539 mol N₂
11.539 mol N₂ × [tex]\frac{2 mol Na}{3 mol N_{2} }[/tex] = 7.692 mol Na
7.692 mol Na × [tex]\frac{22.99 g Na}{1 mol Na}[/tex] = 176.85 g Na = 177g of Na
Learn more about how to determine the mass here:-
https://brainly.com/question/24721477
#SPJ2
household items that are substance or mixture
Oil and water.
Lemon juice and tea.
Honey and tea.
Milk and chocolate.
Coffee and cream.
Cream and sugar.
Flour and butter.
Cereal and milk.
Answer:
oil ,water lemon juice and tea coffee an cream honey and tea milk and chocolate these are mixtures
Which best explains why a black T-shirt gets warmer in the Sun than a white T-shirt?
Group of answer choices
Darker colors reflect more energy from electromagnetic waves than lighter colors do.
Darker colors reflect more energy from colliding particles than lighter colors do.
Darker colors absorb more energy from electromagnetic waves than lighter colors do.
Darker colors absorb more energy from colliding particles than lighter colors do.
Answer:
the color black absorbs energy which in turn will make u hot. the color white reflects energy which in turn will keep u cool
Explanation:
Answer:
The answer is c
Explanation:
The answer is c because dark colored clothes absorb more electromagnetic waves than a white t-shirt because lighter only reflects
Which quantity increases as a free-falling object approaches Earth's surface?
a, momentum
b. stopping force
c. both momentum and stopping force
d. neither momentum nor stopping force
Answer:
a momentum
Explanation:
because it appears Earth's surface
On approaching the earth's surface, the momentum of the object increases. Thus, option A is correct.
The momentum can be defined as the velocity of the specific mass of the object. The stopping force has the force acting in the opposite direction of the force applied to reduce the acting force.
When an object has been approaching the earth's surface there has been an increase in the mass of the object with respect to the gravity force. The increase in mass results in the increase in the momentum of the object.
Thus, on approaching the earth's surface, the momentum of the object increases. Thus, option A is correct.
For more information about the free-falling object, refer to the link:
https://brainly.com/question/13299152
How many moles are in a 63.60g sample of carbón
Answer:
5.296 Moles
Explanation:
I literally found this answer in one of my old notebooks if you need I can try to explain it so you can understand.
As an apple falls from a tree, which types of energy are changing?
Group of answer choices
Elastic energy and sound energy
Light energy and gravitational potential energy
Kinetic energy and nuclear energy
Gravitational potential energy and kinetic energy
Describe how you could use the Beer's Law simulation to experimentally determine the best wavelength at which to perform an experiment
A. Measure the absorbance for solutions of multiple different solutes and find the minimum absorbance.
B. Measure the absorbance for solutions with different concentrations and find the slope of the trendline.
C. Measure the absorbance for the same solution at different wavelengths and find the maximum absorbance.
D. Measure the absorbance for the same solution in different cuvette sizes and find the y-intercept.
Answer:
Measure the absorbance for the same solution at different wavelengths and find the maximum absorbance.
Explanation:
To obtain the wavelength of maximum absorption, many different wavelengths must be passed through a solution and the corresponding absorption is measured for each wavelength.
The wavelength at which the maximum absorption occurs is known as the wavelength of maximum absorption. This is the wavelength st which the experiment should be performed.
Use the hypothetical atom drawings (A-F) below to answer the next four questions. Note there is only one correct choice for each question and each choice is only used once. a.Which shows the absorption of violet light? Explain your reasoning.b.Which shows the emission of blue light? Explain your reasoning.c.Which shows the absorption of green light? Explain your reasoning.d.Which the emission of orange light? Explain your reasoning.e.Which shows an electron being ejected from the atom?
Answer:
a) D
b) C
c) B
d)E
e)A
Explanation:
For clarity, I have attached the images of the transitions to aid understanding.
The visible spectrum consists of Red, Orange, Orange,Yellow Green, Blue,Indigo,Violet. The magnitude of the wavelength of each decreases from left to right in that order. This implies that the red portion of the spectrum is less energetic than the violet portion because energy of a photon increases with decreasing wavelength.
D corresponds to the violet region because the energy difference between the two energy levels is high and requires the absorption of short wavelength, high energy photons of light.
In (b), image C represents an emission that involves a shorter wavelength and can only correspond to blue since it is from a energy level n=3 to n=1
In image (c) , green light is intermediate in energy and will correspond to image B because image F reflects a transition that occurs at a longer wavelength since the energy levels are close together.
In (d) orange light is found at the far, long wavelength portion of the spectrum hence it may involve an n=4 to n=2 transition.
A represents the ionization of the atom, the electron is finally lost from the atom.
Which is the best way to determine if an object is made of pure silver?
O Determine the solubility of the object.
O Test to see if the object is chemically reactive.
Determine the density of the object and compare the known density of pure silver.
O Compare the mass of the silver object to the mass of a piece of pure silver.
Answer:
C. Determine the density of the object and compare the known density of pure silver.
Explanation:
A pure silver is a chemical substance that comprises of 0.1% of trace elements and 99.9% of silver. It is also known as fine silver in chemistry.
Due to the fact that pure silver has a very high level of purity, it is usually too soft for jewelry making and as such it's mixed with other metals such as copper, nickel, zinc, palladium etc. so as to make it hard.
In Chemistry, the best way to determine if an object is made of pure silver is to determine the density of the object and compare the known density of pure silver. This can be done by properly weighing the object to determine its mass and then determining its volume by checking how much water is displaced when completely immersed. The respective values for mass and volume of the object is then used to calculate its density.
Density can be defined as mass all over the volume of an object. Simply stated, density is mass per unit volume of an object.
Mathematically, density is given by the formula;
[tex]Density = \frac{mass}{volume}[/tex]
After determining the density of the object, it is then compared with the density of pure silver which is ideally 10.5g/cm³.
A gas cylinder with a volume of 12.5 L contains 36.3 g of gas. What is the density of the gas?
Density = Blank g/L
Answer:
The answer is 2.90 g/LExplanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\[/tex]
From the question
mass = 36.3 g
volume = 12.5 L
We have
[tex]density = \frac{36.3}{12.5} \\ = 2.904[/tex]
We have the final answer as
2.90 g/LHope this helps you
Please help! I'm so confused
Answer:
screwdriver,fork,key,screw
Explanation:
the key is made of either copper or a different metttal or conducter just like the other objects are made of a semiconducting material
What does it mean to say that the
atoms in a sample of an element are
isotopes of each other?
Answer:
They have the same number of protons, but a different number of neutrons.
Explanation:
All atoms of the same element have the same number of protons, however, they don't necessarily have the same number of neutrons. If atoms of the same element have different numbers of neutrons, they are isotopes of one another. An example is carbon-12 and carbon-13. Carbon-12 has 6 protons and 6 neutrons. Carbon-13 has 6 protons and 7 neutrons. They are isotopes.
Daniel Harris has always enjoyed eating tuna fish. Unfortunately, a study of the mercury content of canned tuna in 2010 found that chunk white tuna contains 0.6 ppm Hg and chunk light tuna contains 0.14 ppm.2 The U.S. Environmental Protection Agency (EPA) recommends no more than 0.1 μg Hg/kg body weight per day. A person weighs 63 kg . How often may the person eat a can containing 6 ounces (16 oz=1 lb) of chunk white tuna so that they do not average more than 0.1 μg Hg/kg body weight per day?
А The person can consume one 6 oz can of chunk white tuna every_______ days.
If the person switches to chunk light tuna, how often can they eat one can?
The person can consume one 6 oz can of chunk light tuna every_______ days.
From the information given:
In 2010, the mercury content of:
The mass of chunk white tuna = 0.6 ppm The mass of a chunk of light tuna = 0.14 ppmweight of the body = 63 kgmass of the tuna = 6 ozIt is recommended that the maximum amount of mercury consumed by the body should not be more than 0.1 micrograms per day.
To determine how often may the person eat a can containing 6 ounces of chunk white tuna, we need to go through the following processes:
First, let convert the mass of the tuna to grams
Since 1 oz = 28.3495 g
Mass of the tuna = 6 oz × 28.3495 g
= 170.097 g
The maximum amount of mercury (Hg) permitted to be consumed by a 63 kg body weight in a day = 63 × 0.1
= 6.3 micrograms/day
However, the mass of the mercury (Hg) = concentration (Hg) × mass of tuna
= 0.6 × 10⁻⁶ × 170.097 g
= 1.0206 × 10⁻⁴ g
= 102.06 μg (micrograms)
Thus, the time required between the consumption of one 6 oz can of chunk white tuna is:
[tex]=\mathbf{ \dfrac{102.06}{6.3}}[/tex]
= 16.2 days
≅ 16 days
The time required between the consumption of one 6 oz can of chunk white tuna is approximately every 16 days.
To determine how often may the person eat a can containing 6 ounces of chunk light tuna, we need to go through the following processes:
However;
the mass of the mercury (Hg) = concentration (Hg) × mass of tuna
= 0.14 × 10⁻⁶ × 170.097 g
= 2.4814 × 10⁻⁵ g
= 23.814 μg
Thus, the time required between the consumption of one 6 oz can of chunk white tune is:
[tex]=\mathbf{ \dfrac{23.814}{6.3}}[/tex]
= 3.78days
≅ 4 days
The time required between the consumption of one 6 oz can of chunk light tuna is approximately every 4 days.
Therefore, we can conclude that the time required between the consumption of one 6 oz can of chunk white tuna is approximately every 16 days and the time required between the consumption of one 6 oz can of chunk light tuna is approximately every 4 days.
Learn more about mercury here:
https://brainly.com/question/4025230?referrer=searchResults
For the 52nd electron must pair with one of the
electrons in the 5p orbital.
Answer:
This question is incomplete
Explanation:
This question is incomplete, however, the element that has 52 electrons only is Tellurium (Te) and when the electronic configuration of elements with more than 52 electrons are written, the 52nd electron is indicated/paired the same way the 52nd electron of Te is indicated/paired. Hence, while writing the electronic configuration of Te, it is written as
[Kr] 4d¹⁰ 5s² 5p⁴ where [Kr] is the electronic configuration of krypton. Based on this, we can deduce that the 52nd electron will be in the first orbital of the P subshell (as attached in the picture). This is because when indicating the electrons in the subshell, one electron will be spread across each orbital and if any electron is still remaining, it will be added starting from to the first orbital of the subshell, however no two electrons in an orbital in a subshell can have the same spin and hence must face opposite direction based on pauli's exclusion principle (as seen in attached); thus for the 5p-orbital of elements with 52 or more electrons, when one electron each is represented in each box (3 boxes in total) in the 5p-orbital, the remaining electron is paired with the the first electron in the first box of the 5p-orbital
Will do brainliest! Atoms of two different elements must have different
electrical charges.
numbers of neutrons.
atomic numbers.
energy levels.
Please
the answer is atomic number
Answer:
atomic numbers
Explanation:
In order for two atoms to be different, they have to have a different number of protons. Protons are represented by the atomic number. Thus, atoms of two DIFFERENT elements must have different atomic numbers.
I took the test and got 100%
Hope this helps!
Which of these is an example of a physical change?
A banana ripening in the air
Hydrogen burning in the air
Zinc reacting with an acid
Liquid water turning into vapor
Answer:
Liquid water turning into vapour.
Explanation:
Just the matter changes from one stage to another...
Answer:
D. liquid water turning into vapor
Explanation:
Correct on Edge 2022!!!
Good luck everyone, you got this! Have a great day!
which of the following describes a synthesis reaction
Answer: Two reactants combine to form one product.
Explanation: :/
gr
12. I want to group items together that are a like in some way.
This is called
12
Answer:
it's called cassification?
Assign an oxidation number to each atom in the reactants.
4Al(s)+3O2(g)→2Al2O3(s)
(Oxidation number for both Al and O is needed)
Answer:
Al⁺³ , O⁻²
Explanation:
This is an oxidation reduction reaction (Redox).
Chemical reaction:
4Al + 3O₂ → 2Al₂O₃
The oxidation state on Al and O on left hand side is zero. On right hand side Al is present in +3 oxidation state while O is present in -2 oxidation sate.
Oxygen is reduced and Al is oxidized in this reaction.
The oxidation reduction reactions are called redox reaction. These reactions are take place by gaining or losing the electrons and oxidation state of elements are changed.
Oxidation:
Oxidation involve the removal of electrons and oxidation state of atom of an element is increased.
Reduction:
Reduction involve the gain of electron and oxidation number is decreased.
4.3 moles of Ra(OH)2 to grams
How many moles are in 1.204 x 10^24 atoms of gold?
Answer:
The answer is 2 molesExplanation:
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
N = 1.204 × 10²⁴ atoms of gold
We have
[tex]n = \frac{1.204 \times {10}^{24} }{6.02 \times {10}^{23} } \\ [/tex]
We have the final answer as
2 molesHope this helps you