The wavelength of the characteristic, bright yellow-orange flame test color of sodium is 590 nm. Calculate the average energy (ΔE) associated with this atomic emission line.
Final answer:
The average energy associated with the atomic emission line of sodium with a wavelength of 590 nm is calculated using Planck's equation, resulting in an energy of approximately 3.37×10-19 Joules per photon.
Explanation:
The question asks for the calculation of the average energy (ΔE) associated with the atomic emission line of sodium, which has a wavelength of 590 nm. To calculate this, we use the Planck's equation ΔE = h⋅c / λ, where h is Planck's constant (6.626×10-34 J⋅s), c is the speed of light in a vacuum (3.00×108 m/s), and λ is the wavelength in meters.
To convert the wavelength from nanometers to meters, we use the conversion 590 nm = 590 × 10-9 m. Substituting the values into the equation gives us ΔE = (6.626×10-34 J⋅s) ⋅ (3.00×108 m/s) / (590×10-9 m), which calculates to an energy of about 3.37×10-19 Joules per photon.
Nic bought 12 pens for 2$ each and 12pads of paper for 3$ each. Write two expressions for how nic could calculate his total.Write one expression in expanded form and one in factored form.
An atom of aluminum has 13 protons and 14 neutrons. what is the atomic mass
The atomic mass of the atom of aluminum having 13 protons and 14 neutrons is 27
How to determine the atomic mass?Atomic mass of an atom is simply defined as the sum of the protons and neutron in the nucleus of an atom i.e
Atomic mass = proton + neutron
Now, we shall obtain the atomic mass of the atom of aluminum. Details below:
Number of protons = 13Number of neutrons = 14 Atomic mass =?Atomic mass = proton + neutron
= 13 + 14
= 27
Thus, we can conclude that the atomic mass of the atom of aluminum is 27
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How many grams of h2 are needed to react with 48 grams of o2, given the reaction: 2 h2 (g) + o2 (g) --> 2 h2o (l)?
The stoichiometric equation shows that 2 moles of H2 react with 1 mole of O2. In this scenario, 48 grams of O2 is equivalent to 1.5 moles. Therefore, 1.5 moles of O2 would react with 3 moles of H2, which is equivalent to 6 grams.
Explanation:To solve this question, we must first understand the stoichiometric relationship that exists between H2 and O2 according to the given equation: 2 H2 (g) + O2 (g) --> 2 H2O (l). What this equation shows is that 2 moles of H2 react with 1 mole of O2.
Next, we must convert grams of O2 to moles, using its molar mass. The molar mass of O2 is 32 g/mol, so 48 grams of O2 is equivalent to 48 g / 32 g/mol = 1.5 mol.
Then we use the stoichiometric relationship to calculate the moles of H2 needed. As per the reaction, 1 mole of O2 reacts with 2 moles of H2, hence 1.5 moles of O2 would react with 2*1.5 = 3 moles of H2. Finally, convert the moles of H2 to grams, using its molar mass (2 g/mol). So, 3 mol * 2 g/mol = 6 g. Therefore, 6 grams of H2 are needed to react with 48 grams of O2.
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WILL MARK AS BRAINLIEST
Name the following ionic compounds.
Calcium chloride contains calcium and chloride ions. write the ground-state electron configuration for the chlorine ion.
The electron configuration of an atom of Chlorine Cl (neutral Chlorine) is:
1s2 2s2 2p6 3s2 3p5
Now if the Chlorine becomes an ion, it becomes Cl-. So we can see that 1 electron is added therefore the new electron configuration is:
1s2 2s2 2p6 3s2 3p6
What is a double bond?
Question 4 options:
two covalent bonds between adjacent molecules
a total of two covalent bonds in a molecule
two covalent bonds between adjacent atoms in a molecule
a total of two covalent bonds between molecules
The answer is A
Two covalent bonds between adjacent molecules
Hope it helps you
When an atom completely gives up its valence electrons to another atom, they form a bond that is considered to be?
Answer: ions
Explanation:
Use the periodic table to answer this question: are the properties of rubidium (rb) more similar to cesium (cs) or those of strontium (sr)
why does your reflection in a mirror look different from your reflection in wood
The surface of a mirror is smoothly and therefore the rays of light are reflected with the same angle they hit the surface. The surface of a piece of wood on the other hand has a lot of microscopical imperfections and hence the rays of light are reflected in multiple directions.
The reflection in a mirror looks different from the reflection in wood because mirrors have smooth surfaces that reflect light at specific angles, while wood and other rough surfaces diffuse and reflect light in many different directions.
Explanation:When we look at our reflection in a mirror, we see a clear and accurate representation of ourselves because mirrors have smooth surfaces that reflect light at specific angles. On the other hand, when we look at our reflection in wood or other rough surfaces, the light gets diffused and reflected in many different directions, causing distortions and a less accurate reflection.
What did Dmitri Mendeleev contribute to science
He arranged the first periodic table?
Do you know how to do this? if you have 4 grams of carbon-14, how much carbon 14 remains after 11,460 years? the half life is 5,730 years.
Explain how you know that hno3 is an acid but nh4no3 is not an acid
Answer:
HNO3 is the monoprotic acid and completely dissociate in water and gives the H+.
Dissociation of Nitric acid in water: HNO3→ H+ + NO3-
In NH4NO3 Ammonium is formed by a weak base and is therefore a relatively stronger acid.
Nitrate is formed from a strong acid and is therefore an extremely weak base.
Therefore the overall Compound is slightly acidic. The salt of a strong acid (HNO3) and a weak
Base (NH3) is acidic.
The chemical equations:
NH4NO3(s) → NH4+ (aq) + NO3-(aq)
NH4+ (aq) <==> NH3 (aq) + H+ (aq)
(The second equation favors products slightly due to the presence of NO3- continuously joining with the H+ ions and then separating again. This is what causes an acidic pH)
Explanation
Arrhenius Acids and Bases
1. An acid is a substance which dissociates in water to produce one or more hydrogen ions (H+).
2. A base is a substance which dissociates in water to produce one or more hydroxide ions (OH-).
Brønsted-Lowry Acids and Bases
1. An acid is a substance from which a proton (H+ ion) can be removed. Essentially, an acid donates protons to bases.
2. A base is a substance to which a proton (H+) can be added. Essentially, a base accepts protons from acids.
Acids that can donate only one proton are monoprotic, and acids that can donate more than one proton are polyprotic
So according to Arrhenius and Bronsted-Lowry Acid and Base concept HNO3 is the strong monoprotic acid
And NH4NO3 is the salt of Strong acid and weak base so it is slightly acidic in nature.
When in solution, ammonium nitrate will dissociate very well into NH4+ and NO3-. The ammonium ion is a Bronsted-Lowery acid in that it will donate an H+ to solution. In turn, this forms ammonia (NH3). Ammonia being a weak base will accept hydrogen ions from the solution, but not all of them. In conclusion, the solution will form an equilibrium where the pH is slightly acidic due to H+ ions being loose in solution.
HNO₃ is considered an acid because it readily donates H⁺ ions in water, while NH₄NO₃ is not considered an acid because its NH⁺⁴ ions do not significantly contribute to the concentration of H+ ions in solution.
When nitric acid dissolves in water, it dissociates into H⁺ ions and NO⁻³ ions. The presence of H⁺ ions in solution is what characterizes an acid. These H⁺ ions can readily donate protons, making the solution acidic.
When ammonium nitrate dissolves in water, it dissociates into NH⁴⁺ ions and NO⁻³ ions. However, NH⁺⁴ ions do not readily donate protons in an aqueous solution, which means they do not increase the concentration of H⁺ ions. Therefore, NH₄NO₃ does not exhibit acidic behavior.
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Which best explains why collective bargaining increases the bargaining power of workers?
The answer to this question is It's difficult for employers to replace their entire work force.
Pellets of calcium chloride are spread on a sidewalk covered in water that is 36°C. Under which circumstance will the calcium chloride dissolve faster?
Answer:
In case if the pellets of the calcium chloride gets crushed.
Explanation:
When the pellets of calcium chloride get crushed it enhances the surface area of the compound. With the increase in surface area, the number of collisions in between the molecules of reactants increases. In the given case, the reactant molecules are water molecules and calcium chloride ions. In the procedure of dissolution, the calcium chloride ions get hydrated by the water molecules dipoles. As the frequency of the collision enhances, the activation energy gets lowered in order to begin the reaction.
A student has two substances at a lab table. One substance is iron pyrite (fool's gold) and the other is real gold. After placing a 20.0-gram sample of iron pyrite into 40.0 mL of water in a graduated cylinder, it displaces 4.0 mL of water. The density of real gold is almost 4 times larger than iron pyrite. If a 20.0-gram sample of real gold is placed into the same amount of water, approximately how much water will be displaced?
A) 1 mL
B) 4 mL
C) 16 mL
D) 20 mL
Answer:The correct answer is option A.
Explanation
Mass of the iron pyrite= 20 grams
Volume water displaced by the iron pyrite = 4 mL
Density of iron pyrite=[tex]d_i=\frac{Mass}{Volume}=\frac{20 g}{4 mL}=5 g/mL[/tex]
[tex]d_g=4\times d_i[/tex](Given)
[tex]d_g=4\times 5 g/mL=20 g/mL[/tex]
Mass of gold = 20 g
Volume of water displaced by the 20 grams of water = V
[tex]D_g=20 g/mL=\frac{20 g}{V}[/tex]
V = 1 mL
20 grams of gold will displace 1 ml of water.So, the correct answer is option A.
Define and then describe the difference between a polar covalent bond, nonpolar covalent bond and ionic bond.
How many different kinsds of polypeptides, each composed of 12 amino acids, could be synthesized using 20 common amino acids?
There are 4 types of peptides, dipeptide, tri-peptide, oligopeptide, and polypeptide. Dipeptides synthesized by 20 amino acids by using the square of 12 i.e. 20¹².
What are polypeptides?The polymer of peptides is known as polypeptides i.e. the long chain of peptide bonds are known as polypeptides. Basically, these are the bond that combines the amino acids in the bond for protein synthesis.
Dipeptides are the type that contains two bonds, tripeptides are the bond that contains 3 bonds and oligopeptides are those where more than 2 and less than 20 amino acids are attached to each other.
Polypeptides are the polymer chain of proteins a long chain of amino acids helps in the formation of protein for metabolism and synthesis of protein.
Each is composed of 12 amino acids and could be synthesized in the form of
20 amino acid * 12 amino acid chain = 20¹².
i.e. by taking 20 chains of 12 amino acids
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In chemistry, to be classified as an organic substance, a substance must contain
The Organic substance must contain at least Carbon and Hydrogen.
Organic substance:
These are the compounds in which Carbon is covalently linked to the other elements such as Hydrogen, Oxygen, Nitrogen, phosphorus, etc.
For example-
Amino acids are made up of C, H,O, N, etc.Carbohydrates are mainly composed of C, H, and O.Lipids or Oil are generally made up of Carbon and Hydrogen only.Therefore, the Organic substance must contain at least Carbon and Hydrogen.
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In the water cycle, which state of matter has the particles closest together? solid liquid gas plasma
Answer:
solid
Explanation:
How do the names of covalent compounds differ from the names of ionic compounds?
The names of ionic compounds have special endings for the second element or ion while the name of covalent compounds depends on the subscript of each of the elements in the compound.
Ionic compounds are usually made up of a cation and an anion. There is no special ending in the name of the cation but certain suffixes are used for the second element or ion in an ionic compound.
For instance, the second element in most ionic compounds have the ending "-ide". Typical examples are sodium oxide, magnesium nitride and calcium phosphide.
In naming covalent molecules, we need to be sure that the subscripts of the molecules are duly indicated. For instance, N2O5 is dinitrogen pentaoxide.
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List the sub-atomic particles in the order in which they were discovered and tell who discovered each one.
If cacl2 is dissolved in water, what can be said about the concentration of the ca2+ ion? hints if is dissolved in water, what can be said about the concentration of the ion? it has the same concentration as the cl− ion. its concentration is half that of the cl− ion. its concentration is twice that of the cl− ion. its concentration is one-third that of the cl− ion.
How many orbitals are possible in the third energy level?
When preparing dilute solutions of an acid, carefully pour -
a. both liquids at once
b. the acid into the container
c. the acid into the water
d. water into the acid?
When preparing dilute solutions of acid, carefully pour the acid into the water.
Explanation:
Acid is a chemical substance that gives hydronium ions in their aqueous solution.[tex]HA(s)+H_2O(l)\rightarrow H_3O^+(aq)+A^-(aq)[/tex]
Their aqueous solution tastes sour.They are used to neutralize the alkali solution. Like hydrochloric acid neutralizes sodium hydroxide to give sodium chloride and water as a product.The acid solution with a larger amount of acid in its solution is considered a concentrated acid solution.The acid solution with a smaller amount of acid in its solution is considered a dilute acid solution.The concentrated acid solution can be changed into a dilute acid solution by adding the concentrated acid solution in water slowly and with constant stirring.Do not add water in concentrated acid solution as water and acid reacts vigorously which can cause water to boil and acid to splash.So, from this, we conclude that when preparing dilute solutions of acid, carefully pour the acid into the water.
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The alcohol functional group contains the elements of oxygen hydrogen and carbon.
a. True
b. False
Answer:False
Explanation:
The given statement is false as alcohol functional group has elements only of oxygen and hydrogen.
What are elements?Elements are defined as a substance which cannot be broken down further into any other substance. Each element is made up of its own type of atom. Due to this reason all elements are different from one another.
Elements can be classified as metals and non-metals. Metals are shiny and conduct electricity and are all solids at room temperature except mercury. Non-metals do not conduct electricity and are mostly gases at room temperature except carbon and sulfur.
The number of protons in the nucleus is the defining property of an element and is related to the atomic number.All atoms with same atomic number are atoms of same element.
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Jesse travels 3.0 meters east and then turns and travels 4.0 meters north. What distance did Jesse travel? 1 m 5 m, northeast 7 m 7 m, northeast
Answer : The correct option is, 7 m
Explanation :
Distance : It is defined as the how much distance is covered by an object during the motion. It is a scalar quantity that means it does not depends on the direction.
Displacement : It is defined as the change in the position of an object. It is a vector quantity that means it has magnitude and as well as direction.
According to the question,
The distance traveled by jesse towards east = 3.0 m
The distance traveled by jesse towards north = 4.0 m
The total distance traveled by jesse = 3.0 m + 4.0 m = 7.0 m
Hence, the distance traveled by jesse is, 7 m
Why the atomic mass of the copper is not exactly equal to 64
Why is a neutral iron atom a different element than a neutral carbon atom?
In the reaction B + KL + H, if an additional B is added, the result will be _____.
more K will be produced
more L will be required
the reaction will slow down
more L and H will be produced
Answer is: more L and H will be produced.
Balanced chemical reaction: B + K → L + H.
According to Le Chatelier's Principle, the position of equilibrium moves to counteract the change.
The position of equilibrium will move so that the concentration of B decreases again, by reacting more and produce L and H, reaction is going to be more in forward direction.