Among electromagnetic waves, UV rays are most dangerous because exposure to these radiation cause serious problems in living organism. Therefore, the emission of electromagnetic radiation by an excited atom is best explained by photoelectronic effect.
What is electromagnetic wave?Electromagnetic wave is a wave which contain two component one is electric component and other is magnetic component. The electric and magnetic component are perpendicular to each other. There are so many wave that comes under electromagnetic wave like infrared wave , radio wave.
There is a relation between energy of wave. frequency of wave, and wavelength of wave
Mathematically,
E=hc/λ
where,
E = energy of electromagnetic wave
h is planks constant having value 6.67×10⁻³⁴js
c is speed of light that is 3×10⁸m/s
λ is the wavelength of electromagnetic wave
The emission of electromagnetic radiation by an excited atom is best explained by photoelectronic effect.
Therefore, the emission of electromagnetic radiation by an excited atom is best explained by photoelectronic effect.
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Which is the highest sublimation point for phosphorus tribromide and water or carbon dioxide?
Under standard atmospheric conditions, water has a higher sublimation point when compared with carbon dioxide; water sublimes from ice to vapor at 0°C, while carbon dioxide sublimes at -78.5°C.
The question is regarding the comparison of the sublimation points of phosphorus tribromide, water, and carbon dioxide. To answer which has the highest sublimation point, let's refer to their respective phase diagrams and critical data. From the information provided:
Water's triple point occurs at 0.01°C and 0.00604 atm or 611 Pa. At pressures lower than this, water directly sublimes from ice to vapor at 0°C.
Carbon dioxide's triple point is at -57.57°C and 5.11 atm. At 1 atm pressure, solid CO₂ sublimes directly to vapor at -78.5°C, its normal sublimation temperature.
Phosphorus tribromide (PBr₃) is not mentioned in the provided data, so we'll leave it out of this comparison.
Water has a much higher sublimation temperature (0°C) compared to carbon dioxide (-78.5°C) under standard atmospheric conditions (1 atm). This indicates that water has a much higher sublimation point than carbon dioxide.
Sand dollars typically live in the intertidal zone. Which adaptation do sand dollars most likely have?
Answer:
burrowing in sandy or muddy substrates.
Explanation:
sand dollar also known as a sea cookie or snapper biscuit in New Zealand, or pansy shell in South Africa refers to species of extremely flattened, burrowing sea urchins belonging to the order Clypeasteroida. Some species within the order, not quite as flat, are known as sea biscuits.Sand dollars can also be called "sand cakes" or "cake urchins".
Sand dollars live beyond the low water line on top of or beneath the surface of sandy or muddy areas. Sand dollars are frequently found together on the ocean bottom.
Compound 1: 76.0% ru and 24.0% o (by mass), compound 2: 61.2% ru and 38.8% o (by mass). part a what is the empirical formula for compound 1?
Which of the following has zero acceleration?
A. A satellite orbiting at a constant speed.
B. A car making a turn at a constant speed.
C. A person running 100 m straight across a field at a constant speed.
D. A person running once around a track at a constant speed.
Answer:
C. A person running 100 m straight across a field at a constant speed.
Explanation:
Acceleration is defined as the change in the velocity per unit time. Velocity have both direction and magnitude (speed) . So, acceleration involves both change in direction and speed.
A). The satellite is in a curved orbit, so direction of satellite is constantly changing. Hence, not the answer.
B). The car is following a curve, so its direction is changing. Hence, not the answer.
C). The person is running straight at constant speed which means no change of speed or direction. Hence, it is the answer.
D). The person is on curved track, so his/her direction is changing. Hence, not the answer.
Which component is missing from the process of cellular respiration? Glucose + Oxygen → Carbon Dioxide + ________ + Energy
The answer is: Water.
Chemical reaction of cellular respiration (convert biochemical energy):
C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O.
glucose + oxygen → carbon dioxide + water + energy .
This reaction is exothermic (energy is released).
Carbon dioxide and water are released during cellular respiration.
In cellular respiration where organic matter is transformed into carbon dioxide and energy is released for production of ATP.
Glucose and oxygen are reactants and carbon dioxide, water and energy are products of this chemical reaction; cellular respiration creates an energy molecule (ATP) when glucose is broken down.
Explain why the quantum number set (3, 3, -2, +½) is not possible for an electron in a ground-state atom.
How does the arrangement of particles in a gas differ from the arrangements in liquids and solids?
What is the mass percent composition of oxygen in ethylene glycol, c2h6o2?
Describe how molecular models might prove to be helpful to scientists.
A 100.0 g sample of water at 27.0°c is poured into a 70.3 g sample of water at 89.0°c. what will be the final temperature of the water?
Answer:
The final temperature of water = 52.6 C
Explanation:
The heat (q) lost or gained by a substance of mass m corresponding to a temperature change from T1 to T2 degrees is given as:
[tex]q = m*c*(T2-T1)[/tex]-----(1)
where c = specific heat of the substance
For water, c = 4.18 J/gC
In the given situation:
Heat lost by 70.3 g of water = Heat gained by 100.0 g of water
Based on equation (1) and considering that heat lost is negative:
[tex]-70.3*c*(T2-89.0)=100.0*c*(T2-27.0)[/tex]
Solving the above equation gives:
T2 = 52.6 C
An electron is a particle with a _____.
negative charge, found in the nucleus
negative charge, found outside the nucleus
positive charge, found in the nucleus
positive charge, found outside the nucleus
Answer: An electron is a particle with a negative charge, found outside the nucleus.
Explanation: In an atom, there is a nucleus in the center that has protons and neutrons. Mostly the mass of an atom is the sum of masses of protons and neutrons. Protons are positively charged ions and neutrons are neutral.
Electrons are present around the nucleus(outside the nucleus) in different energy shells. An electron has negative charge and gain or loss of electrons is the cause of chemical reactions.
Number of protons equals to the atomic number of an atom. Number of electrons is also same to the number of protons for a neutral atom where as the difference of mass number and protons is the number of neutrons.
An electron is a particle with a negative charge, found outside the nucleus and the correct option is option 2.
An electron is a negatively charged subatomic particle that can be either bound to an atom or free (not bound). An electron that is bound to an atom is one of the three primary types of particles within the nucleus of an atom -- the other two are protons and neutrons.
The structure and quantity of electrons in an atom dictate the specific energy levels or orbitals that the electrons inhabit. There can be up to two electrons in the first electron shell, and there can be up to eight electrons in each of the second and third electron shells.
An atom's reactivity and chemical characteristics are governed by the number of electrons in its outermost shell.
Thus, the ideal selection is option 2.
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10 points: What do Lewis structures show?
A.) only electrons that are unavailable for bonding
B.) all but the valence electrons
C.) only valence electrons
D.) all electrons
Lewis structures show only valence electrons. They use dots and lines to represent valence electrons and bonds, respectively. By drawing Lewis structures, we can understand how atoms form bonds and predict the behavior of molecules.
Explanation:Lewis structures show only valence electrons. Valence electrons are the outermost electrons in an atom, and they are the ones involved in bonding. Lewis structures use dots and lines to represent valence electrons and bonds, respectively.
The dots around the atomic symbol represent the valence electrons of the element. For example, carbon has 4 valence electrons, so its Lewis structure would have 4 dots around it. Lines are used to represent bonds, where each line represents a pair of shared electrons.
By drawing Lewis structures, we can understand how atoms form bonds with each other and how electrons are shared between atoms in a molecule. This helps us determine the shape and properties of molecules and predict their behavior.
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The half-life of an isotope is the time required for half the nuclei in a sample of the isotope to
A less-intense wave will have fewer _____ than a more-intense wave.
Decibels is the answer for this one.
Of the pigments that were soluble in the solvent, which pigment is the most polar? yellow, red, purple, blue
Why did the flame of the burning match or splint go out sodium carbonate and hcl?
Final answer:
The flame from the match or splint is extinguished when sodium carbonate reacts with HCl because carbon dioxide gas is produced. CO2 is heavier than air and does not support combustion, therefore it surrounds the flame, displacing the oxygen and putting the flame out.
Explanation:
The flame of the burning match or splint goes out when sodium carbonate (Na2CO3) reacts with hydrochloric acid (HCl) due to the production of carbon dioxide (CO2). This chemical reaction is a typical acid-base reaction where sodium carbonate acts as a base and hydrochloric acid acts as the acid. When these substances are combined, the sodium carbonate is neutralized, and one of the products formed is carbon dioxide gas. Carbon dioxide is a well-known fire extinguisher; it does not support combustion like oxygen does. Therefore, when carbon dioxide is released during the reaction, it displaces the oxygen around the flame, causing the flame to be extinguished.
A similar observation can be made in an experiment setup using lime water and carbon dioxide. Lime water turns milky in the presence of carbon dioxide, which is a simple test to indicate the production of CO2 gas. Additionally, in a combustion analysis, CO2 is produced when a compound containing carbon undergoes combustion. In this scenario, however, the carbon dioxide is resulting from a neutralization reaction rather than combustion but still plays a similar role in snuffing out the flame.
1. Fill in the chart below (Table below) by writing formulas for the compounds that might form between the ions in the columns and rows. Some of these compounds don’t exist but you can still write formulas for them.
How does the number of hydrogen atoms compared to the number of oxygen atoms in each amino acid?
The number of hydrogen atoms which are compared to the number of oxygen atoms in each amino acid because:
One amino acid contains 2 oxygen atoms and 4 hydrogren atomsA hydrogen atom is an atom of hydrogen which contains one positively charged proton and a negatively charged electron and is held together by a nucleus.
As a result of this, when comparing the number of hydrogen atoms and the number of oxygen atoms, it is important to note that they have different number in the R group and each R group may be different in the number of atoms.
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A water molecule is added to an atp molecule to break atp down into adp and a phosphate group. write the chemical equation for this reaction.
The hydrolysis of ATP involves breaking it down into ADP, an inorganic phosphate, and energy using a water molecule. The chemical equation is ATP + H₂O → ADP + Pi + energy. This reaction releases energy necessary for cellular functions.
The reaction described is a hydrolysis reaction, where a water molecule is used to break down ATP. The chemical equation for this reaction is:
ATP + H₂O → ADP + Pi + energy
In this reaction:
ATP (adenosine triphosphate)H₂O (water)ADP (adenosine diphosphate)Pi (inorganic phosphate)Hydrolysis releases the energy stored in the high-energy bonds between ATP's phosphate groups. ATP is like a rechargeable battery, where the breakdown into ADP and Pi releases energy needed for cellular processes, and can be regenerated back into ATP.
Which best describes the mass realationships between protons, neutrons, and electrons?
A) electrons and neutrons are equal is mass but protons are much larger
B) protons and neutrons are relatively the same mass, whereas electrons are much lower in mass
C) protons and neutrons are basically of equal mass
Protons and neutrons are relatively the same mass, whereas electrons are much lower in mass.
What is the relationship between the mass of electron, proton, and neutron?
Protons and neutrons have an equal mass which is equal to 1.67262 × 10⁻²⁷ kg.
Whereas electrons have almost negligible mass. The mass of an electron is 1/1,836 of a proton.
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Consider the reaction mg(s)+fe2+(aq)→mg2+(aq)+fe(s) at 79 ∘c , where [fe2+]= 3.50 m and [mg2+]= 0.310 m . part a what is the value for the reaction quotient, q, for the cell? express your answer numerically.
For the reaction Mg(s) + Fe²⁺(aq) → Mg²⁺(aq) + Fe(s),
when [Fe²⁺]= 3.50 M and [Mg²⁺]= 0.310 M, the reaction quotient is 0.0886.
Let's consider the following balanced equation.
Mg(s) + Fe²⁺(aq) → Mg²⁺(aq) + Fe(s)
The reaction quotient (Q) is the ratio of the molar concentrations of the product species over those of the reactant species involved in the chemical reaction, taking stoichiometric coefficients of the reaction into account as exponents of the concentrations. It only includes gases and aqueous species.
Given [Fe²⁺]= 3.50 M and [Mg²⁺]= 0.310 M, the reaction quotient for this cell is:
[tex]Q = \frac{[Mg^{2+} ]}{[Fe^{2+} ]} = \frac{0.310}{3.50} = 0.0886[/tex]
For the reaction Mg(s) + Fe²⁺(aq) → Mg²⁺(aq) + Fe(s),
when [Fe²⁺]= 3.50 M and [Mg²⁺]= 0.310 M, the reaction quotient is 0.0886.
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what occurs in a chemical reaction
a. reactants break bonds and form new bonds to make new substances.
b. reactants break bonds and reform the same bonds.
c. reactants break bonds but do not form new substances
d. no chemical bonds are broken
Answer:
a. reactants break bonds and form new bonds to make new substances.
I took test K12 :)
In a chemical reaction occurs that reactants break bonds and form new bonds to make new substances.
The chemical reaction is the way in which one substance reacts against another, that is, they are thermodynamic processes of transformation of matter.
These reactions involve two or more substances (reactants), which change significantly in the process, and can consume or release energy to generate two or more substances called products.
They involve the formation or destruction of chemical bonds between the molecules of the reactants, generating a loss or gain of energy.In a chemical reaction, matter is deeply transformed.They generate certain products depending on the nature of the reagents, but also on the conditions in which the reaction occurs.Therefore, we can conclude that in a chemical reaction occurs that reactants break bonds and form new bonds to make new substances.
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Compounds with very high vapor pressures must have very minimal intermolecular forces true or false
Which of the following is a product formed when K reacts with Cl2?
KCl
K2Cl
KCl2
K2
Answer: KCl
Explanation: Potassium [K] has an atomic no of 19 and the electronic configuration is:
[tex]K :1s^22s^22p^63s^23p^64s^1[/tex] tends to get stable by losing one electron and forming [tex]K^+[/tex]
Chlorine [Cl] has atomic no of 17 and thus the electronic configuration is :
[tex]Cl :1s^22s^22p^63s^23p^5[/tex] tends to get stable by gaining one electron and forming [tex]Cl^-[/tex]
[tex]K^+[/tex] and [tex]Cl^-[/tex] attract each other and form an ionic bond. As we have a chlorine molecule that is two atoms of chlorine are present, 2 atoms of potassium will react to form 2 moles of KCl.
[tex]2K+Cl_2\rightarrow 2KCl[/tex]
Which is the most active nonmetallic element in group 16?
Oxygen (O) is the most active nonmetallic element in group 16, known as the chalcogens, due to its high electronegativity and ability to form compounds with most elements.
Explanation:The most active nonmetallic element in group 16, also known as the chalcogens, is oxygen (O). Oxygen is highly reactive, forming compounds with most elements, and is a crucial component for life on Earth. Among the chalcogens, which include oxygen, sulfur, selenium, tellurium, and polonium, oxygen is the most electronegative, meaning that it has a stronger tendency to attract electrons towards itself in a chemical bond. This property makes oxygen the most active nonmetal in its group.
How many moles of chlorine are in 6.67X10^40 chlorine molecules
Please put in scientific notation
To solve for the number of moles, we simply have to use the Avogadros number which states that there are 6.022 x 10^23 molecules per mole. Therefore:
number of moles = 6.67 X 10^40 chlorine molecules / (6.022 x 10^23 molecules / mole)
number of moles = 1.108 x 10^17 moles
Answer: 1.108 x 10^17
Explanation:
Calculate the molecular weight when a gas at 25.0 ∘c and 752 mmhg has a density of 1.053 g/l .
Give the chemical formula and systematic name for aurous sulfide, which is named using the older nomenclature. spelling counts!
Aurous sulfide has the chemical formula Au2S, and in systematic nomenclature, it is named gold(I) sulfide.
Explanation:The chemical formula for aurous sulfide is Au2S. The name aurous sulfide uses the older nomenclature where the suffix '-ous' indicates a lower oxidation state of the metal. In systematic nomenclature, this compound is named gold(I) sulfide. Gold in this compound has a +1 oxidation state. Therefore, the systematic name clearly provides the charge on the gold ion, which is essential for distinguishing between different oxidation states of elements in compounds.
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The chemical formula of glucose is C6H12O6, so it is classified as a(n)
Answer:
The answer is D. Pure Substance
Explanation:
Which equivalence factor set should you use to convert 126 g c to atoms c? (1 mol c/126 g c)(6.02 x 1023 atoms c/1 mol
c.(1 mol c/12.01 g c)(6.02 x 1023 atoms c/1 mol
c.(12.01 g c/1 mol c)(1 mol c/6.02 x 1023 atoms
c.(12.01 g c/1 mol c)(6.02 x 1023 atoms c/1 mol c)?
Answer: The equivalence factor set that should be used is [tex]\frac{126g}{12.01g}\times 6.022\times 10^{23}[/tex]
Explanation:
Molar mass of a substance is defined as the mass of one mole of a substance.
We know that:
Molar mass of carbon atom = 12.01 g/mol
Given mass of carbon atom = 126 grams
Applying unitary method:
12.01 grams of carbon occupies 1 mole
So, 126 grams of carbon will occupy = [tex]\frac{1mol}{12.01g}\times 126g[/tex]
According to mole concept:
1 mole of an element contains [tex]6.022\times 10^{23}[/tex] number of atoms
So, [tex]\frac{1mol}{12.01g}\times 126g[/tex] of carbon will contain = [tex]\frac{1mol}{12.01g}\times 126g\times \frac{6.022\times 10^{23}}{1mol}=\frac{126g}{12.01g}\times 6.022\times 10^{23}[/tex] number of atoms
Hence, the equivalence factor set that should be used is [tex]\frac{126g}{12.01g}\times 6.022\times 10^{23}[/tex]