Answer: The Aufbau principle.
Explanation:
According to aufbau's principle of filling electronic orbitals, the sublevels with lower energies are filled up before those with higher energies. The orbitals with lower (n+l) value will be filled prior to higher (n+l) value.
Hunds rule states that an orbital can contain two electrons only if all other orbitals in that sublevel contain at least one electron.
Paulis exclusion principle states that two electrons must have opposite spin , which means that no two electrons can have same set of quantum numbers.
Heisenberg principle states that it is impossible to measure simultaneously the exact position and momentum of subatomic particle.
Answer:
option c
hope helps you have a great day
What is the degree of oxidation of a simple substance
Answer:
The oxidation state of a free element (uncombined element) is zero. For a simple (monoatomic) ion, the oxidation state is equal to the net charge on the ion. For example, Cl– has an oxidation state of -1. When present in most compounds, hydrogen has an oxidation state of +1 and oxygen an oxidation state of -2
Which total mass is the largest?
(A) The mass of 2 electrons
(B) The mass of 2 neutrons
(C) The mass of 1 electron plus the mass of 1 proton
(D) The mass of 1 neutron plus the mass of 1 electron
Answer: B
Explanation: because the subatomic particle with the largest mass is the neutron.
What is the shape of the waterline?
What's the electron configuration of an N-3 ion?
Question 17 options:
A)
[Ne]
B)
[Ar]
C)
[H]
D)
[He]
Answer:
A. since Nitrogen has 7 electrons and when it gains 3 electrons it will have 10 electrons. using short hand rule it is [Ne]
Write balanced equations for the reaction of Mg(OH)2 with stomach acid (HCl). Express your answer as a chemical equation. Identify all of the phases in your answer.
Answer:
Mg(OH)₂(s) + 2HCl(aq) ----> MgCl₂(aq) + 2H₂O(l)
Explanation:
Magnesium hydroxide is a white solid that is sparingly soluble in water. It is a basic hydroxide, therefore it neutralizes acids to form salt and water.
Magnesium hydroxide commonly used as an antacid, for example milk of magnesia, because it reduces stomach acid, and increases water in the intestines which may induce bowel movements. It also relieves indigestion, sour stomach, and heartburn. Magnesium hydroxide is also used as a laxative to relieve occasional constipation.
The equation for the reaction between magnesium hydroxide and stomach acid, HCl, is as follows:
Mg(OH)₂(s) + 2HCl(aq) ----> MgCl₂(aq) + 2H₂O(l)
What do you have to do to break a molecule?
Answer:
Heat the molecule
Explanation:
Since most bonds require energy to form, they also give off energy when they are broken. But before most bonds break, the molecule has to be heated. Then the atoms start to move, and when they move too much, the bond breaks. Molecules that require less energy to break than they give off when broken are called fuels.
its snowing RIGHT NOW yay santa!!!!
Answer:
Yay
Explanation:
could i have a heart and branliest plss
55. Which Element has a larger radius- Rb or I?
Rb has larger radius.
Which of the following statements is true?
Electrons have a positive charge.
Protons and neutrons are found in the nucleus.
Electrons and protons are found in the nucleus.
All shells can hold up to eight electrons.
Answer:
2/ Protons and neutrons are found in the nucleus.
Explanation:
8)
C(diamond) → C(graphite)
delta G° = -2.9 kJ/molrxn
Which of the following best explains why the reaction represented above is not observed to occur at
room temperature?
(A) The rate of the reaction is extremely slow because of the relatively small value of AGº for
the reaction.
(B) The entropy of the system decreases because the carbon atoms in graphite are less ordered
than those in diamond.
(C) The reaction has an extremely large activation energy due to strong three-dimensional
bonding among carbon atoms in diamond.
(D) The reaction does not occur because it is not thermodynamically favorable.
Answer: its b hope this helps.
Explanation:
Which of the choices below is matter? *
electricity
wood
sound
O
fire
Answer:
Wood
Explanation:
Matter is anything that has mass. Nor sound, fire or electricity have mass which leaves wood as the final answer.
Help me please this is due today
A compound with a formula mass of 45.08 g/mol is found to be 85.64% Carbon and the remainder Hydrogen. Find the molecular formula:
Two isotopes of hypothetical element X exist with abundances of 30.00% 100X and 70.00% 101X. What is the approximate atomic mass of X (in atomic units, amu)?
(A) 100.3
(B) 100.5
(C) 100.7
(D) 101.0
Answer:
C. 100.7 amu
Explanation:
Isotopes of an element are atoms of an element with the same atomic number but different atomic masses. Each atomic mass of an isotope is known as an isotopic mass. An element that exhibits isotope, that is, that have two or more isotopes has a relative atomic mass that is not a whole number.
Relative atomic mass of X is the sum of the products of the relative abundances of each isotope and its isotopic mass.
For Isotope ¹⁰⁰X: 30% × 100 = 30 amu
For Isotope ¹⁰¹X: 70% × 101 = 70.7 amu
Relative atomic mass of X = (30 + 70.7) amu = 100.7 amu
Therefore, the approximate atomic mass of X is 100.7 amu
Taking into account the definition of mass number, isotopes and atomic mass of an element, the average mass of hypothetical element X is 100.7.
First of all, all atoms are made up of subatomic particles: protons and neutrons, which are part of their nucleus, and electrons, which revolve around them. Protons are positively charged, neutrons are neutrally charged, and electrons are negatively charged (electrons).
On the other hand, the mass number tells us the total number of particles in the nucleus. That is, the mass number is the sum of the number of protons and the number of neutrons in the atomic nucleus.
The same chemical element can be made up of different atoms, that is, their atomic numbers are the same, but the number of neutrons is different. These atoms are called isotopes of the element.
Finally, the atomic mass of an element is the weighted average mass of its natural isotopes.
In other words, the atomic masses of chemical elements are usually calculated as the weighted average of the masses of the different isotopes of each element, taking into account the relative abundance of each of them.
In this case, two isotopes of hypothetical element X exist with abundances of 30.00% 100-X (the atomic mass is 100) and 70.00% 101-X (the atomic mass is 101). Then, the average mass of X can be calculated as:
100×0.30 + 101×0.70= 100.7
Finally, the average mass of hypothetical element X is 100.7.
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brainly.com/question/14403750?referrer=searchResults brainly.com/question/10043246?referrer=searchResults brainly.com/question/15553207?referrer=searchResultsDiscard the water from the first step and re-fill the tall drinking water glass with the chilled water. Then slowly pour a small amount of the hot, green freshwater into the water in the drinking glass. Describe and explain you observations.
Answer:
The hot water remains at the top of chilled water.
Explanation:
The hot water remains at the top of chilled water because hot water has less denser as compared to chilled water. Due to higher density of chilled water, it remains at the bottom due to its greater mass while on the other hand, the hot freshwater goes upward and spreads at the top of the chilled water due to lower mass so when the hot water is added to the chilled water, hot water remains at the top.
Most elements are __ at room temperature
Answer:
Most elements are Solids at room temperature
Light waves travel at different speeds through different medium. Which list shows the correct order of increasing speed of light waves in medium, from slowest to fastest?
A solids → liquids → gases
B gases → liquids → solids
C gases → solids → liquids
D liquids → solids → gases
Answer:
I think the correct answer is B
The speed of the light is different in different medium. The speed of the light is highest in vacuum. The increasing speed of light waves in medium, from slowest to fastest is gases → liquids → solids. The correct option is B.
What is light wave?A light wave is a mechanical wave. A mechanical wave is defined as the wave which is an oscillation of matter and it is responsible for the transfer of energy through a medium. There are two types of mechanical wave, they are longitudinal waves and transverse waves.
The light wave is a transverse wave. The movement of the particles is at right angles or perpendicular to the motion of the energy. The speed of the light depends on the density of the medium. The more density, less will be the speed of the wave.
The gaseous state has less intermolecular force of attraction as compared to the liquids and solids. So in gaseous state light has maximum speed.
Thus the correct option is B.
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The standard enthalpy of vaporization of methanol is 35.2 kJ/mol at its normal boiling point, 64.6°C. What is the standard change in entropy for the vaporization of methanol at its normal boiling point?
A) 0.104 J/(mol middot K)
B) 104 J/(mol middot K)
C) 545 J/(mol middot K)
D) -35.2 J(mol middot K)
E) 0.545 J(mol middot K)
Answer:
B) 104 J/mol.K
Explanation:
Step 1: Given data
Standard enthalpy of vaporization (ΔH°vap): 35.2 kJ/molNormal boiling point (Tb): 64.6 °CStep 2: Convert "Tb" to Kelvin
We will use the following expression.
K = °C + 273.15
K = 64.6°C + 273.15
K = 337.8 K
Step 3: Calculate the standard change in entropy for the vaporization of methanol (ΔS°vap)
The vaporization is the phase transition from the liquid phase to vapor. We can calculate the standard change in entropy for the vaporization using the following expression.
ΔS°vap = ΔH°vap / Tb
ΔS°vap = (35.2 × 10³ J/mol) / 337.8 K
ΔS°vap = 104 J/mol.K
The standard change in entropy for the vaporization of methanol at its normal boiling point is 104 J/mol.K.
How do we calculate entropy of vaporization?Standard change in entropy for the vaporization will be calculated by using the below equation as:
ΔS°vap = ΔH°vap / Tb, where
ΔH°vap = standard enthalpy of vaporization of methanol = 35.2 kJ/mol
Tb = Boiling point of methanol = 64.6°C = 64.6°C + 273.15 = 337.8 K
On putting all these values on the above equation, we get
ΔS°vap = (35.2 × 10³ J/mol) / 337.8 K
ΔS°vap = 104 J/mol.K
Hence option (B) is correct.
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Which is the correctly balanced equation?
A) Cl2 + 2NaI = 2NaCl + I2
B) NaOH +HCl = NaCl + H2O2
C) 2HgO = Hg + O2
D) 2Li + H2O = 2LiOH + H2
PLS HURRY, TAKING TEST, NEED HELP NOW
Answer:
A) Cl2 + 2NaI = 2NaCl + I2
What is required to cause change in matter
Answer:
Adding or removing energy from matter causes a physical change as matter moves from one state to another. For example, adding thermal energy (heat) to liquid water causes it to become steam or vapor (a gas). And removing energy from liquid water causes it to become ice (a solid). ... Most liquids contract as they freeze.
Explanation:
have a nice day
Cl2 +
NaBr
-
NaCl +
Br2
Answer:
hope this helps :)
Explanation:
Cl2 + NaBr = NaCl + Br2
NaCl + Br2 = NaBr + Cl2
The compound iron(III) nitrate is a strong electrolyte. Write the transformation that occurs when solid iron(III) nitrate dissolves in water. Be sure to specify states such as (aq) or (s).
Answer:
Fe(NO₃)₃ (s) → Fe³⁺ (aq) + 3 NO₃⁻ (aq)
Explanation:
The iron (III) nitrate is a salt, that can be 100 % dissociated in water.
Fe(NO₃)₃ (s) ⇒ Fe³⁺ (aq) + 3 NO₃⁻ (aq)
It is not considered 100% neutral, because Fe³⁺ can release protons to water, when it is hidrated. It works similar as the Al ³⁺.
NO₃⁻ (aq) + H₂O (l) ← OH⁻(aq) + HNO₃(aq)
This reaction can not occur. Nitrate is a weak base, derivated from a strong acid, so it can't make hydrolysis.
Salt can be a little acid, because Fe³⁺ react to water to give protons, and a determined complex
Fe³⁺ (aq) + H₂O(l) ⇄ Fe(OH)²⁺ (aq) + H⁺(aq)
Which sentence best describes a bond formed between two unlike atoms?
O A. The bond could form only between two atoms of very different
electronegativities.
O B. The electrons involved in the bond are shared equally between the
atoms.
O C. The bond could have been formed only as the result of ions
attracting each other.
D. The type of bond is determined by the difference in
electronegativity of the atoms.
The type of bond is determined by the difference in electronegativity of the atoms. Hence, option D is correct.
What is a bond?A chemical bond is what holds atoms together in molecules.
The ability of an atom to attract a pair of electrons in a chemical bond is called its electronegativity. The difference in electronegativity between two atoms determines how polar a bond will be.
Hence, option D is correct.
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When 240 mg of a certain molecular compound X are dissolved in 35.0 g of dibenzyl ether ((C6H5CH2)2O), the freezing point of the solution is measured to be 1.0 °C. Calculate the molar mass of X If you need any additional information on dibenzyl ether, use only what you find in the ALEKS Data resource. Also, be sure your answer has a unit symbol, and is rounded to the correct number of significant digits.
Answer: MM = 16.55 g/mol
Explanation: Freezing point depression is a phenomena that explains why adding a solute to a solvent decreases the solvent freezing point: when a substance begins to freeze, its molecules slows down and rearrange itself forming a solid. If a solute is added, the molecules from the solvent interfere in the formation of the solid. To guarantee the transformation, the solution has to cooled down even more.
Freezing point and molality concentration is related by
[tex]\Delta T=T_{f}_{(solvent)}-T_{f}_{(solution)}=K_{f}.m[/tex]
where
ΔT is freezing point depression
[tex]T_{f}_{(solvent)}[/tex] and [tex]T_{f}_{(solution)}[/tex] are freezing point of solvent and solution, respectively
[tex]K_{f}[/tex] is freezing point depression constant
m is molality concentration
Dibenzyl ether is the solvent and has the following properties: [tex]K_{f}=[/tex] 6.27 and [tex]T_{f}[/tex] = 3.6°C.
Molality concentration is
[tex]m=\frac{T_{(solvent)}-T_{(solution)}}{K_{f}}[/tex]
[tex]m=\frac{3.6-1}{6.27}[/tex]
m = 0.415
Molality concentration is moles (n) of solute dissolved in a mass, in kilogram, of solvent.
[tex]m=\frac{moles}{mass(kg)}[/tex]
n = m(mass of solvent in kg)
n = 0.415(0.035)
n = 0.0145
Molar mass (M) is the weight of one sample mole and can be calculated as
[tex]n=\frac{m}{M}[/tex]
M = [tex]\frac{m}{n}[/tex]
m in grams
Molar mass of compound X is
[tex]M=\frac{0.24}{0.0145}[/tex]
M = 16.55
Molar mass of molecular compound X is 16.55g/mol
Argon (Ar) is an element in group 18. Argon is _____.
a gas highly reactive
a metalloid
a good conductor of heat
Answer:
c
Explanation:c
it is a good conducter
what is density? chemistry
Answer: Density means the compactness of an object
I hope this helps, and Happy Holidays! :)
How much did one drop of HNO3 cause the pH of water to change?
Answer:
-4
Explanation:
It went from a 7 to a 2 and 7-2 is 4, so it changed by 4 and it went down by 4.
One drop of HNO3 will cause the pH of water to change from 7 to 3
What is effect of addition of acid to pH of a water?
The pH of a solution is the negative logarithm of the hydrogen ion concentration of the solution.
pH = - log[H⁺]At equilibrium, the pH of water = 7
The concentration of hydrogen ions is 10⁻⁷ M
If 0.1 mL (about one drop) of 1.0 M HNO3 is added to 100 mL of water: the volume of solution is 100.1 mL and the concentration of solution is calculated thus:
C₁V₁ = C₂V₂
C₂ = C₁V₁/V₂
C₂ = 0.1 * 1/100.1
C₂ = 9.99 * 10⁻⁴ M
Hydrogen ion concentration, [H⁺] = 9.99 * 10⁻⁴ M
pH = - log(9.99 * 10⁻⁴)
pH = 3
Therefore, one drop of HNO3 will cause the pH of water to change from 7 to 3
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Which isomer of 1-bromo-2-tert-butylcyclohexane reacts faster when refluxed with potassium tert-butoxide?Draw the structure of the expected major product from the faster reacting compound.
Answer:
See explanation and image attached
Explanation:
The reaction of 1-bromo-2-tert-butylcyclohexane with potassium tert-butoxide is an elimination reaction that occurs by E2 mechanism.
The E2 reaction proceeds faster when the hydrogens are in an antiperiplanar position at an angle of 180 degrees.
This is only attainable in the trans isomer of 1-bromo-2-tert-butylcyclohexane. Hence trans 1-bromo-2-tert-butylcyclohexane reacts faster with potassium tert-butoxide
A compound is an example of pure substance
True
False
The volume of a sample of gas measured at 35 C and 1.00 atm pressure is 2.00 L. What must the final temperature be in order for the gas to have a final volume of 3.00 L at 1.00 atm pressure?
Answer:
the final temperature is 465.2k