Answers
The phrase "axial tilt" is essential to understanding why the season change , the words or phrases from the article provided context clues to the meaning of the phrase " axial tilt" is orbits and 23.5 degree offset.
The axial tilt also called as obliquity. The axial tilt is the angle between the objects rotational axis and its orbital axis , perpendicular to the orbital plane. The axial tilt is about 23.5 degree. due to this the sun shines on different latitudes with different angle.
Thus, The phrase "axial tilt" is essential to understanding why the season change , the words or phrases from the article provided context clues to the meaning of the phrase " axial tilt" is orbits and 23.5 degree offset.
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Answer:
A: 2 and 4
Explanation:
ttt
Related Questions
Explain why onions make you cry
Answers
2. when writing the chemical equation for a reaction, how do you indicate that a given reaction is dissolved in water? how do you indicate that a precipitate has formed as a result of the reaction?
Answers
When writing the chemical equation for a reaction, a reactant in aqueous solution is indicated with (aq); formation of a solid is indicated with (s).
Chemical equations serve to represent the transformation of reactants into products. For instance, the combination of iron (Fe) and sulphur (S) results in iron sulphide (FeS). The plus symbol indicates that sulphur and iron react to form FeS.
The four primary categories of chemical reactions are single displacement, double displacement, breakdown, and synthesis. But keep in mind that other people refer to these reactions by other names.
They are equations that represent chemical reactions using chemical formulae and symbols. In a chemical equation, the reactants are represented on the left and the products are on the right. A symbol that denotes the reaction's direction separates these two entities.
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what will the evaporation of water and the formation of sea ice do to the salinity of water? group of answer choices
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The ocean's salinity is raised by both sea ice production and ocean water evaporation. Ongoing inflow of fresh water from the rivers, fall of rain and snow, and the melting of ice constantly balance.
Why is water salinity important?It makes a significant contribution to conductance and influences many elements of the biochemistry in groundwaters as well as the biological activities that take place there. Temperature, pressure, and salinity all influence the physical properties of water, including its density its heat capacity.
How is water salinity influenced?Seawater salinity is impacted by rains, ice development, melting, and drainage. Seawater evaporate, leaving behind salts, which enhances their concentration and raises the salt of the water.
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in the next three problems, we will attempt to solve the problem: what is the standard entropy change for the combustion of 1 mole of diamond at room temperature?
Answers
The standard entropy change for the combustion of 1 mole of diamond at room temperature is 6.22 J / K mol.
The reaction is given as :
C (diamond) + O₂ -----> CO₂
At room temperature the value of S° is given as follows :
C = 2.38 J / K mol
O₂ = 205.2 J/Kmol
CO₂ = 213.8 J/Kmol
The standard entropy change is given as :
ΔS° = ∑S° product - ∑ S° reactant
ΔS° = ( 213.8 ) - ( 2.38 + 205.2)
ΔS° = 213.8 - 207.58
ΔS° = 6.22 J / K mol
Thus, The standard entropy change for the combustion of 1 mole of diamond at room temperature is 6.22 J / K mol.
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why is longitudinal diffusion a more serious problem in gas chromatography than in liquid chromatography?
Answers
The longitudinal diffusion a more serious problem in gas chromatography than in liquid chromatography because the diffusion coefficient is much more larger in gas than the liquid.
What is Chromatography?Chromatography is a type of laboratory technique which is performed for the separation of the mixture of different elements into its components. The mixture firstly dissolved in a fluid solvent which is known as the mobile phase, that carries it through a system at which the material called the stationary phase is fixed.
Not all molecules present in the same solute show same behavior. Different molecules show different behaviour. This is due to mainly three reason which arr given as below:
Resistance to the transfer of matter. Longitudinal diffusionSwirl diffusionThe molecules of solute moves in different direction in the stationary phase, it is due to porosity of the particle that form it.
Thus, we concluded that the longitudinal diffusion a more serious problem in gas chromatography than in liquid chromatography because the diffusion coefficient is much more larger in gas than the liquid.
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How do you find Mass number
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Answer:
Together, the number of protons and the number of neutrons determine an element’s mass number: mass number = protons + neutrons. If you want to calculate how many neutrons an atom has, you can simply subtract the number of protons, or atomic number, from the mass number. A property closely related to an atom’s mass number is its atomic mass.
Explanation:
write the reaction equation for the strong acid titration. you can use generic formula ha for the monoprotic strong acid.
Answers
The molarity of the acid is given, so the number of moles titrated can be calculated: 0.050 L × 6 mol/L = 0.3 moles of strong acid added thus ...
How do you write a titration equation?A strong acid-strong base titration is used to determine the concentration of an acidic solution by titrating it with a known concentration of a basic solution, or vice versa, until neutralisation occurs. Because both the acid and base are strong (high Ka and Kb values), they will fully dissociate, which means that all the molecules of acid or base will separate into ions. Equivalent amounts of H+ and OH- ions combine to form H2O at the equivalence point, resulting in a pH of 7.0. (neutral).
In aqueous solution, an acid that has been completely ionised. In contrast to a weak acid, when a strong acid is placed in a solution such as water, all of the strong acid dissociates into its ions. The general equation for strong acid dissociation is:
HA(aq)→H+(aq)+A−(aq)
The H stands for hydrogen, and the A stands for the acid's conjugate base (anion).
A base that is completely ionized in aqueous solution. This means when the strong base is placed in a solution such as water, all of the strong base will dissociate into its ions. The general equation of the dissociation of a strong base is:
XOH(aq)→X+(aq)+OH−(aq)
The OH represents hydroxide and the X represents the conjugate acid (cation) of the base.
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(a) how many milliliters of 0.155 m hcl are needed to neutralize completely 45.0 ml of 0.101 m ba(oh)2 solution?
Answers
29,322 milliliters of 0.155m hcl are needed to neutralize completely 45.0 ml of 0.101m ba(oh)2 solution Given that :
Hcl + Ba(oh)2 gives Bacl2 + 2h20
Molarity = mole of solute / volume of solution in liters
Molarity = 0.101 m
Volume = 45 ml
mole of solute (ba(0h)2) = Molarity * volume
= 0.101 * 45 ml
= 4.545
now we have to find the volume of hcl so,
again
molarity = mol solute/ volume of solution
volume of solution = mole solute / molarity
= 4.545 / 0.155m
= 29. 322 liters
= 29,322 ml
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The percent ionic character of a bond ______ with δen. An arbitrary value of ______ divides ionic from covalent bonding.
Answers
The percent ionic character of a bond increases with δen. An arbitrary value of 50% ionic character divides ionic from covalent bonding.
What is covalent bond explain?When two or more atoms share one or more couples of electrons, a covalent connection is created. These electrons are being drawn to the two neutrons and protons at the same time. A covalent bond is created when the difference between the two atoms' electrical configurations gets too small for an electrochemical reaction to happen and produce ions.
What characteristics do covalent bonds have?Bonds between atoms in covalent compounds share electrons. They possess distinctive physical characteristics, such as lower melting temperatures and electrical conductivity contrasted to ionic compounds, as a result of the sharing of electrons.
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Compare the structure and bonding of three compounds
Carbon dioxide, magnesium oxide, silicon dioxide
Answers
A solid with a covalent network is silicon dioxide. Carbon dioxide is a covalent molecule, whereas magnesium oxide is an ionic substance.
It is a covalent molecule, carbon dioxide. Although the complex has polar C-O bonds, it is often nonpolar, therefore the molecules are only held together by modest dispersion forces.
Ionic solids include the substance magnesium oxide. It has a crystal lattice made up of magnesium ions and oxygen ions. The chemical is almost insoluble in water because of the significant lattice energy and small ion sizes.
Chains of silicon-oxygen bonds make up the covalent network solid known as silicon dioxide. The network solid has a high melting point and creates a very stiff structure.
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how are the reactivities of tert-butyl bromide and 2-bromopropane related to the stabilities of the carbocations produced as intermediates in the reaction? you must fully justify your answer.
Answers
The reactivities of tert-butyl bromide and 2-bromopropane are related to the stabilities of the carbocations produced as intermediates in the reaction in several ways.
First, it is important to note that tert-butyl bromide has an electron-withdrawing group (carbonyl) attached to its aromatic ring. This makes it more reactive than 2-bromopropane because it is easier for tert-butyl bromide to achieve a favorable resonance structure.
Second, it is also important to note that tert-butyl bromide has a more stable carbocation intermediate than 2-bromopropane because it has a larger number of bonds between carbon atoms. This means that these bonds take longer to break apart during the transition state, which makes it harder for tert-butyl bromide's intermediate to form.
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NEED ANSWER IMMEDIATELY: 14. Problem: Uranium-238 has a mass number of 238 with 146 neutrons in the
nucleus. An isotope, Uranium-235 has 143 neutrons in the nucleus. What is
the atomic number of Uranium?
Answers
Answer:
92
Explanation:
calculate the ph of a buffer solution obtained by dissolving 29.029.0 g of kh2po4(s)kh2po4(s) and 44.044.0 g of na2hpo4(s)na2hpo4(s) in water and then diluting to 1.00 l.
Answers
The pH of buffer solution obtained will be 7.05 by dissolving 29.029.0 g of kh2po4(s)kh2po4(s) and 44.044.0 g of na2hpo4(s)na2hpo4(s) in water and then diluting to 1.00 l.
This can be calculated using use Henderson - Hasselbalch equation:
PH = Pka + ㏒ [A/AH]
Molar mass of KH₂PO₄ = 136.0 g And Molar mass of Na₂HPO₄ = 142.0 g
No. of moles of H₂PO₄⁻ = No. of moles of KH₂PO₄ = (29..0 g) / (136.0 g/mol) = 0.213 mol
No. of moles of HPO₄²⁻ = No. of moles of Na₂HPO₄ = (44.0 g) / (142.0 g/mol) = 0.30 mol
In the solution, [HPO₄²⁻]/[H₂PO₄⁻] = 0.213/0.30
Henderson-Hasselbalch equation:
pH = pKₐ + log([HPO₄²⁻]/[H₂PO₄⁻])
pH = 7.21 + log(0.213/0.30)
pH = 7.05
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he quantum mechanical description of the shaped volumes of space occupied by electrons in an atom are called
Answers
Shaped volumes around the nucleus which are occupied by electrons are called Atomic Orbitals.
The quantum mechanical refinement of Bohr's orbit is an orbital. In contrast to his idea of a straightforward circular orbit with a constant radius, orbitals are regions of space that were calculated analytically and have varying possibilities of hosting an electron. A Quantum Mechanical Description of Electrons Around the Nucleus
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what can you deduce about the conformation of the polystyrene chains under the conditions of the visocity determinations
Answers
Viscosity of polystyrene is determined to know the size of polystyrene its compression, and molding capacity.
To obtain the perfect shape and size the configuration of polystyrene should be maintained under different conditions.
So, to deduce the confirmation of the polystyrene under viscosity determination we can apply 2 methods;
1. By adding excess diluents to the polystyrene which reduces its viscosity.
2. By introducing or adding small linear chains by addition method to the molecular chains of polystyrene molecular structure to reduce chain entanglement.
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What is the best description of the relationship between emerging scientific ideas and open-mindedness?
Open-mindedness results from emerging scientific ideas.
Open-mindedness often leads to emerging scientific ideas.
Open-mindedness leads to critical evaluation of emerging scientific ideas.
Open-mindedness helps people understand that emerging scientific ideas are uncertain.
Answers
The best description of the relationship between emerging scientific ideas and open-mindedness is: Open-mindedness often leads to emerging scientific ideas.
The correct answer choice is option b
Why open-mindedness often leads to emerging scientific idea?It follows that scientific skills emanate faster when a scientist is very open-minded and open to corrections as well. The simple reason why our open-mindedness often results in emerging scientific ideas is simply because it is one of the major keys to investigating scientific problems.
In conclusion, it can be deduced when when we work with transparency, our scientific skills brings positive results.
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question unless otherwise instructed, you may use the periodic table in the chemistry: problems and solutions book for this question. which element is most likely the best conductor of heat?
Answers
Silver is most likely the best conductor of heat according to the periodic table.
The most electrically conductive component is silver, taken after by copper and gold. Silver too has the most elevated warm conductivity of any component and the most noteworthy light reflectance.
The components can be classified as metals, nonmetals, or metalloids. The most electrically conductive component is silver, taken after by copper and gold. Silver too has the most elevated warm conductivity of any component and the most noteworthy light reflectance.
As to why silver is the most excellent conductor, the reply is that its electrons are more liberated to move than those of the other components.
This has got to do with its valence and gem structure. Most metals conduct power. Other components with tall electrical conductivity, are aluminum, zinc, nickel, press, and platinum. Brass and bronze are electrically conductive amalgams, instead of components.
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select all that apply select all the statements that correctly describe steps in the procedure used to identify a limiting reactant. multiple select question. the maximum product possible is given by the sum of the amounts of product formed from each reactant. the reactant that produces the least amount of possible product is the limiting reactant. the reactant that has the highest mass at the beginning of the reaction is in excess. calculate the molar masses of any reactants for which a mass has been given. calculate the amount of product that could be formed from each reactant.
Answers
Step 1: Begin with a balanced chemical equation and starting amounts for each reactant.
Step 2: Convert mass of each starting reactants to moles.
Step 3: Calculate the number of moles used for each reactant. is the limiting reagent.
what is limiting reaction?
The limiting reactant (or limiting reagent) is the reactant that gets consumed first in a chemical reaction and therefore limits how much product can be formed.The reactant that is entirely used up in a reaction is called limiting reagent. In the reaction given above, 3 moles of Hydrogen gas are required to react with 1 mole of nitrogen gas to form 2 moles of ammonia.Determine which reactant is limiting by dividing the number of moles of each reactant by its stoichiometric coefficient in the balanced chemical equation. Use mole ratios to calculate the number of moles of product that can be formed from the limiting reactant.In a chemical reaction, reactants that are not used up when the reaction is finished are called excess reagents. The reagent that is completely used up or reacted is called the limiting reagent, because its quantity limits the amount of products formed.to know more about limiting reaction follow
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It would be nice if someone could help me thank you so much.
Answers
Answer:
All answers are in the above periodic table
how to Calculate the molar heat capacity of iron in J • mol-1 • °C-1 . Its specific heat capacity is 0.4498 J • g-1 • °C-1
Answers
Based on the given specific heat capacity of iron, the molar heat capacity of iron =is 25.18 J/mol/°C.
What is the molar heat capacity of a substance?The molar heat capacity of a substance is the amount of heat required to raise the temperature of a unit mole of that substance by one degree.
The molar heat capacity is given by the formula below:
Molar heat capacity = heat change/mole of substance * temperature changeGiven the specific heat capacity of a substance, the molar heat capacity is obtained as follows
Molar heat capacity = specific heat capacity * molar mass
specific heat capacity of iron = 0.4498 J/g/°C
the molar mass of iron = 56 g/mol
Molar heat capacity of iron = 0.4498 J/g/°C * 56 g/mol
Molar heat capacity of iron = 25.18 J/mol/°C
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why are the first ionization energy of the transition elements from sc to zn fairly constant until zn?
Answers
Due to same d-same shell, that's why first ionization energy of the transition elements .
What is ionization energy?Ionization energy, also called ionization potential, in chemistry and physics, the amount of energy required to remove an electron from an isolated atom or molecule.
What is transition elements?Transition elements (also known as transition metals) are elements that have partially filled d orbitals. IUPAC defines transition elements as an element having a d subshell that is partially filled with electrons, or an element that has the ability to form stable cations with an incompletely filled d orbital.
Why first ionization energy of the transition elements is constant?In transition elements, the first ionization energy of the elements remain constant because of poor shielding in d-subshell. The electrons suffers repulsion due to which their ionic radii does not decrease on moving from left to right. That's why first ionization energy of the transition elements from Sc to Zn fairly constant until Zn.
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a gas cylinder has a volume of 108 L when filled with 22,700 grams of nitrogen gas if the temperature of this cylinder is 27 degrees what is the pressure inside the tank?
Answers
P=183.65 atm is the pressure inside the tank for the given conditions.
How is the pressure calculated?
Given,
V=108 L
m=22700 gm
The formula is PV=nRT
moles= [tex]\frac{Mass}{Molar mass}[/tex]
∴moles of [tex]N_{2}[/tex] = [tex]\frac{22700}{28}[/tex]=810.78 moles.
R=0.082 [tex]\frac{L atm}{molK}[/tex]
T=27°C=300K
P=[tex]\frac{nRT}{V}[/tex]
[tex]P_{N_{2}[/tex]=[tex]\frac{810.71 X 0.0821 X 298}{108}[/tex]
P=183.65 atm
The ideal gas law (PV = nRT) connects the macroscopic characteristics of ideal gases. A gas is considered to be perfect if its particles (a) do not interact with one another and (b) occupy no space (have no volume).
PV = nRT
PV = nRT is the equation for an ideal gas. In this equation, P stands for the ideal gas's pressure, V for the ideal gas' volume, n for the total amount of the ideal gas expressed in moles, R for the universal gas constant, and T for temperature.
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if the bromobenzene is added too quickly, what side product is formed (draw the structure in pen and name it!)?
Answers
If the bromobenzene is added too quickly, biphenyl is formed as the side product with the Grignard reagent.
What is Grignard reagent?
Grignard reagent is an organomagnesium halide which has the formula RMgX where R is alkyl or aryl group, Mg is magnesium, X is an halide.
When bromobenzene is added too quickly to the Grignard reagent, biphenyl is formed as a by-product. the formation of the side product is enhanced by high temperature. So, this reaction is carried out in low temperature.
Therefore, biphenyl is formed as side product when bromobenzene is added quickly to the Grignard reagent. The structure of biphenyl is two benzene rings joined together.
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How many moles are equal to 4.0 x 10^25 atoms of tungsten
Answers
Explanation:
the answer was already on here
what wavelength of light (in nm ) is emitted when the electron in a hydrogen atom relaxes from the n
Answers
102 nm wavelength of light is emitted when the electron in a hydrogen atom relaxes from n= 3 to n= 1
∆E = - Rh × ( 1/nf² - 1/ni² )
∆E = difference in energy between final and initial energy level (J )
R = Rydberg's constant
nf = final energy level
ni = initial energy level
nf = 3, ni = 1, Rh = 2.18 × 10-¹⁸
∆E = -2.18 × 10-¹⁸ ( 1/3² - 1/1² )
= 2.18 × 0.88 × 10-¹⁸ J
∆E = 1.93 × 10-¹⁸ J
∆E = hf = hc / λ
λ = (h × c) / ∆E
= ( 6.625 × 10-³⁴ × 3 × 10⁸) / 1.93 × 10-¹⁸
= 19.878 × 10-²⁶ / 1.93 × 10-¹⁸
= 10.299× 10-⁸
= 102.99×10-⁹
= 102 nm
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What temp is the warmest?
A. 30 degrees celsius
B. 273 kelvin
C. 0 degrees celsius
D. 32 degrees Fahrenheit
Answers
Answer:
30 degrees Celsius, is 86 Fahrenheit.
273 kelvin, is 31.73 Fahrenheit.
0 degrees Celsius, is 32 Fahrenheit.
Then 32 degrees Fahrenheit.
The correct answer choice is A. 30 degrees Celsius.
how do acids and bases interact with water? how does this interaction be different for strong acids and weak acids?
Answers
Acid and Bases interact in water as they form Hydronium ion and hydroxide ions. The interaction for strong acids and weak acids produces salts.
Acid are those which have ability to dissociates into H⁺ ions. ans the bases are those which have ability to produce OH⁻ ions. when we mix acid with water it produce hydronium ions.
HCl + H₂O -----> H₃O⁺ + Cl⁻
when we mix base with water it produced hydroxide ions.
NaOH + H₂O ------> Na⁺ + OH⁻
The mixture of two acids of different will react together. while when two acids mix the reaction do not happen. when we mix weak acid with the strong acid it produces salt because weak acid have higher pH which is basic.
Thus, Acid and Bases interact in water as they form Hydronium ion and hydroxide ions. The interaction for strong acids and weak acids produces salts.
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a noble gas has a density of 1.78 g/l at stp. what is the identity of the gas? enter the elemental symbol of the gas.
Answers
The gas after the calculation has a molar mass of 39.95g/mol which is that of Argon. The elemental symbol of gas is Ar.
We know that 1 mol of gas has 22.4L of any gas at STP.
Given in the question is the density of the gas 1.78g/l at STP.
Hence the mass of 22.4 L of the elemental gas at STP is its molar mass.
Hence molar mass
=22.4 l/mol × 1.7824 g/L
= 39.925g/mol
These gases are called noble gases because they are majestic in nature, which means they dont react with anything in general.
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a 5.00 g sample of a compound containing only chlorine and oxygen contains 1.94 g of chlorine. what is the empirical formula of this compound?
Answers
The empirical formula of this compound is ClO₇.
If a 5.00 g sample of a compound containing only chlorine and oxygen contains 1.94 g of chlorine, then the mass of its oxygen is the difference between the mass of the sample and the mass of its chlorine.
mass compound = mass oxygen + mass chlorine
mass oxygen = mass compound - mass chlorine
mass oxygen = 5.00 g - 1.94 g
mass oxygen = 3.06 g
Determine the number of moles of each component by dividing the mass by its respective molar mass.
moles oxygen = mass oxygen / MM
moles oxygen = 3.06 g / 15.9994 g/mol
moles oxygen = 0.1912571721
moles chlorine = mass chlorine/ MM
moles chlorine = 1.94 g / 70.9060 g/mol
moles chlorine = 0.02736016698
Get the ratio between the two components to determine its empirical formula.
moles oxygen : moles chlorine = 0.1912571721 : 0.02736016698
moles oxygen : moles chlorine = 7 : 1
Hence, he empirical formula of this compound is ClO₇.
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what absorbance did you record for spinach at 400 nm?6.25 points question 2what absorbance did you record for spinach at 420 nm?6.25 points question 3what absorbance did you record for spinach at 440 nm?
Answers
It was discovered that the photosynthetic pigment in spinach best absorbed light between the wavelengths of 400 and 450 nm as well as at 650 nm. Additionally, it was discovered that this green phototroph barely absorbed light at wavelengths about 550 nm.
What is Absorbance ?The logarithm of the ratio of incident to transmitted radiant power through a sample is known as absorbance. As an alternative, absorbance can be defined as "the negative logarithm of one minus absorptance, as measured on a homogeneous sample," for samples that scatter light.
The opposite of transmittance, or absorbance (A), indicates how much light the sample absorbed. Additionally known as "optical density." A logarithmic function of T is used to compute absorbance: A = log10 (1/T) = log10 (Io/I).The concentration of the molecule (C) and the sample's path length (L), which is typically equal to the cuvette's path length, combined make up the three factors that affect an absorbance value. The extinction coefficient () is the next factor.What is the absorbance of Spinach ?The disks will rise as a result of bubbles developing on their surface when the leaves create oxygen. The leaves eventually sink if the cup's light source is taken away.
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