Why do we assume that the color of the flame is due to the positive ion ?
Answer:
Any element placed in a flame will change its color. Atoms are made of positively charged nuclei, about which negatively charged electrons move according to the laws of quantum mechanics. Quantum mechanics constrains them to appear in various distinct patterns, called orbitals. (Orbitals are a lot like planetary orbits, but blurrier, so that you're never quite sure just where the electrons are.)
Left on their own, the electrons of an atom tend to relax into orbitals that leave the atom with the lowest possible energy--its ground state. Putting atoms into a flame, though, adds energy to the looser electrons farthest from the nucleus and pushes them into other orbitals. Eventually, these excited electrons drop back to where they ought to be, and in so doing, they release the energy they stored up as particles of light, called photons.
Explanation:
what is the term for an object strength of motion
Answer:
Inertia
Explanation:
Inertia is the tendency of an object to resist a change in motion. Newton's First Law of Motion is also called the law of inertia. A full aquarium is harder to move than an empty one because the law of inertia.
Which element represents 16 protons and 16 neutrons
chemistry question worth 40 points!!
Solving the Sequence of an Oligopeptide From Sequence Analysis Data Analysis of the blood of a catatonic football fan revealed large concentrations of a psychotoxic octapeptide. Amino acid analysis of this octapeptide gave the following results: 2 Ala 1 Arg 1 Asp 1 Met 2 Tyr 1 Val 1 NH4 1 The following facts were observed: a. Partial acid hydrolysis of the octapeptide yielded a dipeptide of the structure C O C N H H COOH H3C CH3 CH3 C CH H3 N b. Chymotrypsin treatment of the octapeptide yielded two tetrapeptides, each containing an alanine residue. c. Trypsin treatment of one of the tetrapeptides yielded two dipeptides. d. Cyanogen bromide treatment of another sample of the same tetrapeptide yielded a tripeptide and free Tyr. e. N-terminal analysis of the other tetrapeptide gave Asn. What is the amino acid sequence of this octapeptide
Answer:
The amino sequence of an octapeptide can be determined by :
i.Amino acids present in the peptide
ii.By the behaviour shown by the treatment of these material with different biological and chemical reactions
As shown ammonium was released from the peptide,which shows that the peptide contains either Asn or Gln.
As there is presence of Asp in the amino acid analysis which indicates that the octapeptide contains Asp.
Acid hydrolysis hydrolyzes the peptide bonds which yields a Ala-Val which is the result of partial acid hydrolysis.
Chymotrypsin is on the C-terminal side of the aromatic amino acids Phe, Tyr, and Trp. The peptide has Tyr which indicates that the two present tetrapeptides after chymotrypsin treatment are fourth and eighth amino acids i-e N--Tyr-C and Tyr as the fourth amino acid and Ala-Val somewhere in the octapeptide
As Arg is only present on the C terminal side of the Trypsin cleavage therefore Arg must be the second or the sixth amino acid for the two dipeptides to form as a result of arginine treatment of a tetrapeptide
Cyanogen bromide cleaves on the C-terminal side of Met residues. For free Tyr to be produced from cyanogen bromide treatment of one of the tetrapeptides, Met must be either the third or seventh amino acid. Because Ala was present in both tetrapeptides, Ala must be either the first or fifth amino acid, present in the same tetrapeptide as Arg and Met,i-e N.-Tyr-C and Ala-Val somewhere in the octapeptide and Ala-Arg-Met as the first, second, and third or fifth, sixth, and seventh amino acids and Tyr as the fourth amino acid.
One of the tetrapeptides contains Ala-Val as its second and third amino acids and Asn as its N-terminal amino acid. Therefore two combinations are possible as below
N-Asn-Ala-Val-Tyr-Ala-Arg-Met-Tyr-C or N-Ala-Arg-Met-Tyr-Asn-Ala-Val-Tyr-C
Answer:
The amino aciid sequence of an octapeptide can be determined from the amino acids that are present in the peptide and from the results of different chemical and biological treatments.
One equivalent of ammonium was released fro the peptide, indicating that the peptide contains either Asn or Gln. The presence os Asp in the amino analysis indicates that the octapeptide contains Asn.
A) Acid hydrolysis hydrolyzes peptide bonds. The dipeptide Ala-Val is obtained by partial acid hydrolysis. The indicates that Ala-Val is present in the peptide
B) Chymotrypsin cleaves on the C-terminal side of the aromatic amino acids. Phe, Tyr, and Trp. The peptide contains only Tyr. The presence of tetrapeptides after the treatment of ohymotrypsin indicates that Tyr is the fourth and eighth amino acids.
N-Tyr-C and Tyr present as the fourth amino acid. in constrast, Ala-Val is present in the octapeptide
C) Trpsin cleaves on the C-terminal side of Arg and Lys residues. only Arg is present in the octapeptide. Arg must be the second or sixth amino acid, for two dipeptide to be formed from arginine during the treatment of one tetrapeptide.
D) Cyanogen bromide cleaves on the C-terminal side of Met residues. For free Tyr to be produced from cynogen bromide treatment of one of the tetrapeptides, Met must be either the third or seventh amino acid. Because Ala is present in both tetrapeptides, Ala must be either the first or fifth amino acid, present in the same tetrapeptide as Arg and Met.
In addition, presence of N-...-Tyr-C and Ala-Val in the octapeptide and Ala-Arg-Met as the first, second, third or fifth, sixth or seventh amino acids and Tyr as the fourth amino acid.
E) One of the tetrapides contains Asn as its N-terminal amino acid, and Ala-Val as its second and third amino acids. Two octapeptides are possible from this peptide analysis.
The amino acid sequence of the octapeptide is the following:
N-Asn-Ala-Val-Tyr-Ala-Arg-Met-Tyr-C:
N-Ala-Arg-Met-Tyr-Asn-Ala-Val-Tyr-C:
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Find the volume in milliliters of 2.00 mol of an ideal gas at 36°C and a pressure of 1120 torr.
Use the ideal gas law and the appropriate Rvalue:
R=0.0821 atmL/mol. K
R= 8.31 kPa • L/mol •K
R= 62.4 torr • L/mol · K
mL
Answer:
V = 34430 mL
Explanation:
Given data:
Volume in mL = ?
Number of moles of gas = 2.00 mol
Temperature = 36°C (36+273= 309K)
Pressure of gas = 1120 torr
Solution:
Formula:
PV = nRT
V = nRT/P
V = 2.00 mol ×62.4 torr • L/mol · K × 309K / 1120 torr
V = 38563.2 torr • L / 1120 torr
V = 34.43 L
L to mL
34.43 L ×1000 mL / 1 L
34430 mL
A student dissolves of sodium hydroxide in of water in a well-insulated open cup. He that observes the temperature of the water rise from to over the course of minutes. Use this data, and any information you need from the ALEKS Data resource,
NaOH(s) rightarrow Na+(aq) + OH-(aq)
You can make any reasonable assumptions about the physical properties of the solution. Note for advanced students: it's possible the student did not do the experiment carefully, and the values you calculate may not be the same as the known and published values for this reaction.
1. Is this reaction exothermic, endothermic, or neither.
2. If you said the reaction was exothermic or endothermic, calculate the amount of neat that was released or absorbed by the reaction in this case.
3. Calculate the reaction enthalpy AW per mole of NaOH.
Answer:
This question is incomplete
Explanation:
This question is incomplete because of the absence of the ALEKS Data's resource. However the steps required to answer questions that tests the heat of solution and heat of reaction are all the same.
1. The description provided in the question is an exothermic reaction; this is because exothermic reaction is a reaction that releases/gives off heat into the environment. The heat given-off here is what the student observed as "the temperature of the water rise from to over the course of minutes".
2. To calculate the amount of heat that was released/heat of solution (q) in joules;
q = m × Cg × (T2 - Ti)
where m = mass of water (can also be represented as volume)
Cg = specific heat capacity of water (4.184 joules)
T2 = final temperature of the solution
Ti = initial temperature of the solution
(T2 -Ti) is temperature change of the solution
3. Generally, enthalpy change for exothermic reaction is negative
Hence the formula for enthalpy change/heat of reaction (ΔH);
ΔH = - (q/1000 ÷ number of moles of solute)
Where q is the heat of solution determined in (2) above
number of moles = mass/molar mass of solute
molar mass of NaOH = 23 + 16 + 1 = 40 g/mol (where Na = 23, O = 16 and H = 1)
Calculate the number of moles in 144 g of P. Please show your work to receive credit.
Answer:
144 g of phosphorus contain 4.65 moles.
Explanation:
Given data:
Mass of phosphorus = 144 g
Number of moles = ?
Solution:
Formula:
Number of moles = mass/ molar mass
Molar mass of phosphorus is 31 g/mol
Now we will put the values in formula.
Number of moles = 144 g/ 31 g/mol
Number of moles = 4.65 mol
Thus, 144 g of phosphorus contain 4.65 moles.
what does it mean for electrons to be excited
Answer:
When an electron temporarily occupies an energy state greater than its ground state, it is in an excited state. An electron can become excited if it is given extra energy, such as if it absorbs a photon, or packet of light, or collides with a nearby atom or particle.
Explanation:
Hope this helps.
Have a good night ma´am/sir.
Be safe!
A type of emergency apparatus that can be used where oxygen may be limited or where the air might be poisoned is based on the following reaction in which CO2 produced by your own respiration reacts and O2 gas is produced. Calculate the mass of KO2 needed to produce 25 g of oxygen gas.
4 KO2(s) + 2 CO2(g) 2 K2CO3(s) + 3 O2 (g)
Answer:
so I don't know how to answer that
the sun has the same diameter as jupiter?
Which feature is used to classify a rock based on its composition?
the origin of the rock
the texture of the rock
the types of minerals in the rock
the shapes of the crystals in the rock
Answer:
the types of minerals in the rock
Answer:
C
Explanation: I took the test and got it right (first person is right)
PLZ HELP HURRY PLZZZZZ WILL GIVE BRAINLIEST
Answer:
I think its b
Explanation:
What is an Ionic Bond and what types of elements are likely to form Ionic Bonds?
Answer:
ionic bonds also called electrovalent bonds areee bonds that exist two metals.It is an electrostatic attraction between positive and negative ions in a Crystal lattice.
Explanation:
examples of elements with this bond are
hydrogen chloride
copper oxide
potassium bromate
If an M&M weighs 0.88 grams, how much would a mole of M&Ms
weigh?
Answer:
5.30x10²³g
Explanation:
A mole can be understood as an amount of something.
One mole of eggs are 6.022x10²³ eggs
One mole of atoms are 6.022x10²³ atoms
One mole of molecules are 6.022x10²³ molecules
And 1 mole of M&M are 6.022x10²³ M&M. As 1 M&M weighs 0.88g, 1 mole will weigh:
0.88g*6.022x10²³ =
5.30x10²³gOne mole of M&Ms will weigh 5.3 x 10²³ grams.
The given parameters
Weight of an M&M = 0.88 gramsOne mole of every substance contains 6.022x10²³ atoms of the substance.
Weight of an M&M, implies an atom of M&M.
1 atom --------- 0.88 grams
6.022x10²³ atoms = ?
= 0.88 g x 6.022x10²³
= 5.3 x 10²³ grams.
Thus, one mole of M&Ms will weigh 5.3 x 10²³ grams.
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Which of the following is NOT a
physical property?
A melting point
B state of matter
C density
D flammability
how would you represent a sulfur isotope that contains 18 neutrons using the format
Answer:
S–34
Explanation:
From the question given above, the following data were obtained:
Neutron number = 18
The isotope of sulphur still retains its atomic number of 16.
Recall:
Atomic number = proton number
Atomic number of sulphur (S) = 16
Therefore,
Proton number = 16
Next, we shall determine the mass number of the sulphur isotope. This can be obtained as follow:
Proton number = 16
Neutron number = 18
Mass number =.?
Mass number = Proton + Neutron
Mass number = 16 + 18
Mass number = 34
The symbol for sulphur is S.
Thus, the symbol of sulfur isotope that contains 18 neutrons is S–34
Identify the noble gas that has atoms with the
same number of electrons as a chloride ion in
table salt.
Answer:
Ar
Explanation:
Chlorine has an atomic number of 17. That means that it has 17 protons and 17 electrons, thus being electrically neutral. When it gains 1 electron to form the chloride ion, the total number of electrons is 17 + 1 = 18.
Argon is a noble gas with an atomic number of 18, that is, it has 18 protons and 18 electrons.}
Then Cl⁻ has the same number of electrons as Ar.
dentify the following chemical reactions as decomposition, combination/synthesis, single-displacement, double-replacement, or combustion.
(a) AgNO3(aq) + KCl(aq) → AgCl(s) + KNO3(aq)
(b) C3H8(g) + 5 O2(g) → 3 CO2(g) + 4 H2O(l)
(c) Cu(s) + 2 AgNO3(aq) → Cu(NO3)2(aq) + 2 Ag(s)
(d) Cu(s) + 2 AgNO3(aq) → Cu(NO3)2(aq) + 2 Ag(s)
(e) SrO(s) + SO2(g) → SrSO3(s)
Answer:
(a)Double Replacement
(b)Double Replacement
(c)Single replacement
(d)single replacement
(e) synthesis
If a chemical reaction leaves you with a new
substance, what do you
think a physical
change/reaction will be?
Answer:
Explanation:
During a physical temperature change, one substance, such as water will be heated. Because one compound is mixed in with another. Therefore, these reactants produce a product. When the reactants are mixed, the temperature change caused by the reaction is an indicator of a chemical change.
What symbol is used to separate the products from each other or the reactants from each other in a chemical reaction?
an arrow pointing to the left
an equal sign
an arrow pointing to the right
a plus sign
Answer:
a plus sign: +
Explanation:
a plus sign is used to separate one reactant or product from another
Answer:
(Chemical Formulas test)
1.Which formula contains a metal and a nonmetal?
answer:(MGO)
2.Which formula represents a covalent compound?
answer:(H2O2)
3.In the formula for water (H2O), what does the lack of a subscript after the O indicate? answer:(There is one oxygen atom in the compound.)
4.What symbol is used to separate the products from each other or the reactants from each other in a chemical reaction?answer: (A PLUS SIGHN)
5.Which option is a covalent compound?
answer:(NO2)
Explanation:
Took the Test and got 100% thank me later
5. What could you do to convert from meters to centimeters? *
A. There is no standard way to convert these units.
B. Leave the decimal in the same position.
C. Move the decimal to the right.
D. Move the decimal to the left.
C.
centi- is essentially 10^2 of one meter.
If you had 100m, multiplying 100 by 10^2 (or 100) would give you 10000 cm.
You are given a glass rod that is negatively charged and a pinwheel that has a negative charge. What will happen when the glass rod is brought close to the pinwheel? Why?
Answer:
they will repel each other
Explanation:
When these two are brought close to one another they will repel each other. This is similar to what happens with magnets, when two objects share the same polarity one object will create a repulsive force upon the second object and push it away. This repellent force is caused by an electric field from the same charged electrons in the atoms of the object. Since in this case both the glass rod and the pinwheel have a negative charge they will repel each other when they come into proximity of one another.
Select the correct answer. What happens if you double the number of batteries used in a circuit? (Assume all of the batteries are the same.) ОА. . The current doubles only. O B. B. The voltage doubles only. O C. The current decreases. OD. The voltage decreases. O E. The voltage and current doubles.
Answer:
THE ANSWER IS "O E. The voltage and current doubles."
I IT HELPS YOU....
Answer:
They are both doubled, answer E
Explanation:
For a reversible reaction, what would a large equilibrium constant indicate?
Question 5 options:
A)
At equilibrium, there will be no reactants left because they will all have been turned into products.
B)
At equilibrium, the concentration of the reactants will be much higher than the concentration of the products.
C)
At equilibrium, the concentration of the products will be about the same as the concentration of the reactants.
D)
At equilibrium, the concentration of the products will be much higher than the concentration of the reactants.
(D) At equilibrium, the concentration of the products will be much higher than the concentration of the reactants.
What happens to the atomic radius when an electron is gained?
O A. The negative ionic radius is larger than the neutral atomic radius.
O B. The negative ionic radius does not follow a trend with the neutral
radius.
O C. The negative ionic radius is smaller than the neutral atomic radius.
O D. The negative ionic radius is the same size as the neutral atomic
radius.
Answer: A. The negative ionic radius is larger than the neutral atomic radius.
Explanation: Did the test just now
Each axis on a graph should be:
equal
O numbered
Olabeled
vertical
What is the most likely reason a computer model is used for a black hole?
Answer:
Black holes are merely the most exotic example of the general principle that ... quantum computer stores bits on protons and uses magnetic fields to flip them. ... Powered by Standard Model software, the universe computes
Explanation:because they are mostly exotic
A certain shade of blue has a frequency of 7.08×1014 Hz. What is the energy of exactly one photon of this light? Planck's constant ℎ=6.626×10−34 J⋅s.
Answer:
We have the final answer as
[tex]4.69 \times {10}^{ - 19} \: \: J[/tex]
Explanation:
To find the energy of a photon of this light we use the formula
E = hfwhere
E is the energy
f is the frequency
h is the Planck's constant which is
6.626 × 10-³⁴ Js
From the question
f = 7.08×10¹⁴ Hz
We have
E = 7.08×10¹⁴ × 6.626 × 10-³⁴
We have the final answer as
[tex]4.69 \times {10}^{ - 19} \: \: J[/tex]
Hope this helps you
A cylinder at left with balls stacked near the bottom of the cylinder has an arrow leading to a cylinder at right cylinder with balls in a layer on the bottom of the cylinder.
How is energy related to the change of state represented by the model?
Atoms gain energy as a solid changes to a liquid.
Atoms gain energy as a solid changes to a gas.
Atoms lose energy as a solid changes to a liquid.
Atoms lose energy as a solid changes to a gas.
The energy related to the change of state represented by the model is atoms gain energy as a solid changes to a liquid. Thus option A is correct.
What is energy?Energy is defined as the quantitative property that is imparted to a body or a physical system and is visible in the performance of work as well as in the form of heat and light.
It can also be defined as ability to perform work.
There are basically nine types of energy:
Thermal energyRadiant energyNuclear energyChemical energy Electrical energyMotion energySound energyElastic energyGravitational energyThere are two more forms of energy.
Potential energyKinetic energyIn terms of atomic randomness, the gas contains atoms with extremely high kinetic energies. Atoms in the solid are only vibrating where they should be. As a result, for a gas to become a solid, some energy must be lost within the atom.
Thus, the energy related to the change of state represented by the model is atoms gain energy as a solid changes to a liquid. Thus option A is correct.
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Answer: Option A
Explanation: took the test