Is diphenylmenthane a solid or liquid at room temperature
Answers
Answer:
diphenylmethane is liquid at room temperature.
Explanation:
It is a solid below room temperature and its melting point is at 22 degree celsius to 24 Celsius degree celsius.
Diphenylmethane is a solid at room temperature. Diphenylmethane is a non-polar compound.
Diphenylmethane is a colorless, crystalline solid with a melting point of 53 °C. It is a member of the diphenylmethanes, which are a class of organic compounds that contain two benzene rings joined by a single carbon-carbon bond.
Diphenylmethane is a non-polar compound, which means that it does not have any permanent dipole moments. This makes it difficult for the molecules of diphenylmethane to interact with each other, which is why it is a solid at room temperature.
If diphenylmethane were a polar compound, the molecules would be able to interact with each other through dipole-dipole interactions. This would make the compound more likely to be a liquid at room temperature.
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Related Questions
A chemist titrates _________ of a _________ ammonia _________ solution with _________ solution at _________. Calculate the pH at equivalence. The _________ of ammonia is _________. Round your answer to 2 decimal places. Note for advanced students: you may assume the total volume of the solution equals the initial volume plus the volume of HCl solution added. pH =_________
Answers
A chemist titrates 25 mL of a 0.1M ammonia aqueous solution with 0.5M HCl solution at 25°C. Calculate the pH at equivalence. The pK_a of ammonia is 9.26. Round your answer to 2 decimal places.
The pH of the solution at equivalence is 9.26. The pH at equivalence can be calculated using the Henderson-Hasselbalch equation, which states that pH = pK_a + log (base/acid).
At equivalence, the base and acid concentrations are equal, so the ratio is 1. Therefore, pH = 9.26. This means that when the 25 mL of ammonia aqueous solution is titrated with 0.5M HCl solution, the pH of the solution will be 9.26.
At the beginning of the titration, the pH of the solution will be higher due to the presence of ammonia. As the titration progresses, the concentration of the acid will increase until it is equal to the concentration of the base, at which point the solution is at its equivalence point. At the equivalence point, the pH will be equal to the pK_a of the base, which in this case is 9.26. This indicates that the pH of the solution at equivalence is 9.26.
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A physical change is a change to a sample of matter in which -
some properties of the material change and the identity of the
matter also change.
TRUE
FALSE
Answers
Answer:
its FALSE
Explanation:
FAKE ITS NOT REAL
When the moon is between the earth and the sun what moon phase will this be
Answers
Answer: New Moon Phase
Explanation:
Answer:
The New Moon phase
Explanation:
The moon in between the earth and the sun will cause it being a new moon because the sun's light doesn't reach the side of the moon thats facing the earth
10. What is the Kinetic Energy of a 100 kg object that is moving with a speed of 13.5 m/s?
Answers
Answer:
\(100 \times 13.5 = ikw n bahaa\)
IKAW na mag tayms
The molecular formula for pentyne is
a.c6h6
b.c5h8
c.c5h12
d.c6h14
Answers
Answer:
B
Explanation:
The molecular formula for pentyne is C5H8
A teller at a drive-up window at a bank had the following service times (in minutes) for 20 randomly selected customers: What are the 3 -sigma control limits? Select one: a. None of the other options.
Answers
Since the exact values of the service times are not provided, it is not possible to calculate the 3-sigma control limits. Therefore, the correct answer is "None of the other options."
The 3-sigma control limits are used in statistical process control to determine the acceptable range of variation in a process. To calculate the 3-sigma control limits, we need to first find the mean and standard deviation of the service times for the 20 randomly selected customers.
Step 1: Find the mean (average) of the service times.
Add up all the service times and divide by the total number of customers (20).
Step 2: Find the standard deviation of the service times.
Calculate the difference between each service time and the mean, square each difference, sum up all the squared differences, divide by the total number of customers (20), and then take the square root of the result.
Step 3: Calculate the 3-sigma control limits.
Multiply the standard deviation by 3 and add/subtract the result to/from the mean. This will give you the upper and lower control limits.
Since the exact values of the service times are not provided, it is not possible to calculate the 3-sigma control limits. Therefore, the correct answer is "None of the other options."
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Help will give brainlyness
Use your periodic table, notes on transition metals, and polyatomic ion table to correctly answer the following:
What is the ionic compound formed from calcium and sulfide ions?
Select one:
O a.
Cas
O b. Ca s
O c. CaSO4
O d. CazS2
Answers
Answer:
The high melting point is also consistent with its description as an ionic solid. In the crystal, each S2− ion is surrounded by an octahedron of six Ca2+ ions, and complementarity, each Ca2+ ion surrounded by six S2− ions.
Explanation:
You can use the periodic table to predict whether an atom will form an anion or a cation, and you can often predict the charge of the resulting ion. Atoms of many main-group metals lose enough electrons to leave them with the same number of electrons as an atom of the preceding noble gas. To illustrate, an atom of an alkali metal (group 1) loses one electron and forms a cation with a 1+ charge; an alkaline earth metal (group 2) loses two electrons and forms a cation with a 2+ charge, and so on. For example, a neutral calcium atom, with 20 protons and 20 electrons, readily loses two electrons. This results in a cation with 20 protons, 18 electrons, and a 2+ charge. It has the same number of electrons as atoms of the preceding noble gas, argon, and is symbolized Ca2+. The name of a metal ion is the same as the name of the metal atom from which it forms, so Ca2+ is called a calcium ion.
When atoms of nonmetal elements form ions, they generally gain enough electrons to give them the same number of electrons as an atom of the next noble gas in the periodic table. Atoms of group 17 gain one electron and form anions with a 1− charge; atoms of group 16 gain two electrons and form ions with a 2− charge, and so on. For example, the neutral bromine atom, with 35 protons and 35 electrons, can gain one electron to provide it with 36 electrons. This results in an anion with 35 protons, 36 electrons, and a 1− charge. It has the same number of electrons as atoms of the next noble gas, krypton, and is symbolized Br−. (A discussion of the theory supporting the favored status of noble gas electron numbers reflected in these predictive rules for ion formation is provided in a later chapter of this text.)
An enzyme that transfers a phosphate moiety in a reaction is called a ___________. The most common source of phosphate for biochemical reactions is ___________.
Answers
An enzyme that transfers a phosphate moiety in a reaction is called a "kinase." The most common source of phosphate for biochemical reactions is "adenosine triphosphate (ATP)."
The most common source of phosphate for biochemical reactions is adenosine triphosphate (ATP), which is composed of adenosine and three phosphate groups. ATP is the primary energy source for many metabolic processes, as the phosphate groups can be readily transferred in different directions, thus releasing energy. During this transfer, the bond between the two phosphate groups is broken and the remaining phosphate group is transferred to another molecule, resulting in the formation of adenosine diphosphate (ADP) and a new compound that contains the phosphate group. Other sources of phosphate for biochemical reactions include phosphoenolpyruvate (PEP) and guanosine triphosphate (GTP).
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At most, how many covalent bonds can a phosphorous atom form?
(A) 1
(B2
(C)3
(D)4
Answers
Answer:
(c)
Explanation:
in both black and red
Answer:
I think 3 im am not sure
Explanation:
An electronics company wants to compare the quality of their cell phones to the cell phones to three competitors. They sample 10 phones from each company and count the number of defects for each phone. If ANOVA was used to compare the average number of defects, then the treatments would be defined as ________
Answers
The treatments would be defined as the four different cell phone companies being compared. Sampling 10 phones from each company and counting the number of defects for each phone allows for a comparison of the average number of defects across these four groups, or treatments.
In ANOVA (analysis of variance), the treatments refer to the different groups or levels being compared. In this case, the electronics company is comparing the quality of their cell phones to three competitors, so the treatments would be defined as the four different cell phone companies being compared.
Each treatment would have 10 observations (or cell phones) for the number of defects, and the ANOVA would test if there is a significant difference in the average number of defects among the four companies.
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In order to understand how atoms can interact, we need to understand
the way that electrons are arranged around the nucleus. What is the
region in space around an atom where electrons dare found called?
Answers
the correct answer is "electron cloud"
30 POINTS
Match the following vocabulary words.
1 .
ellipse
on or about September 22, when the days and nights are equal
2 .
autumnal equinox
an egg-shaped orbit of a heavenly body
3 .
galaxy
one of billions of heavenly systems consisting of numerous stars; an example is the Milky Way
4 .
vernal equinox
the curved pathway of a heavenly body through space
5 .
orbit
the spring equinox, on about March 21, when days and nights are of equal length
Answers
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some reactions can be performed without a solvent. what are the benefits of not needing a solvent in a reaction? select one or more: the reaction often costs less because solvents can be expensive. less chemical waste is generated because there are not solvents to remove. reaction progress is easy to monitor because the reagents are more concentrated. the reaction rate is smaller because the concentration of reagents is greater.
Answers
Less chemical waste is generated because there are no solvents to remove. The reaction often costs less because solvents can be expensive.
The reaction rate is greater because the concentration of reagents is greater. These options are correct.
A solvent is a substance that dissolves a solute, producing a solution. In addition to being a liquid, a supercritical fluid, a solid, or a gas can also be solvent. All the ions and proteins in a cell are dissolved in water, which is a solvent for polar molecules and the most frequent solvent employed by living things.
chemical reaction, the transformation of one or more chemicals (the reactants) into one or more distinct compounds (the products). Chemical elements or chemical compounds make up substances. In a chemical reaction, the atoms that make up the reactants are rearranged to produce various products.
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Note the yellow lines which show attractions between the molecules. Why do you think these attractions occur?
Answers
How is thermal energy distributed in most heating systems?
A.
convection
B.
conduction
C.
radiation
Answers
Answer:
By Convection
Explanation:
plzzz help me i promise will mark u brainiest
Answers
Answer:
d) water
Explanation:
Answer:
C) sodium chloride
How many grams are in 1.76 x 10^23 atoms of iodine
Answers
Answer:
\(\boxed {\boxed {\sf About \ 37.1 \ grams \ of \ iodine }}\)
Explanation:
To convert from atoms to grams, you must first convert atoms to moles, then moles to grams.
1. Convert Atoms to Moles
To convert atoms to grams, Avogadro's number must be used.
\(6.022*10^{23}\)
This number tells us the number of particles (atoms, molecules, ions, etc.) in 1 mole. In this case, the particles are atoms of iodine.
\(\frac{6.022*10^{23} \ atoms \ I }{1 \ mol \ I}\)
Multiply the given number of atoms by Avogadro's number.
\(1.76*10^{23} \ atoms \ I*\frac{6.022*10^{23} \ atoms \ I }{1 \ mol \ I}\)
Flip the fraction so the atoms of iodine will cancel out.
\(1.76*10^{23} \ atoms \ I*\frac{ 1 \ mol \ I}{6.022*10^{23} \ atoms \ I}\)
\(1.76*10^{23}* \frac{1 \ mol \ I}{6.022*10^{23} }\)
Multiply so the problem condenses into 1 fraction.
\(\frac{1.76*10^{23} \ mol \ I}{6.022*10^{23} }\)
\(0.2922617071 \ mol \ I\)
2. Convert Moles to Grams
Now we must use the molar mass of iodine, which is found on the Periodic Table.
Iodine Molar Mass: 126.9045 g/molUse this mass as a fraction.
\(\frac{ 126.9045 \ g\ I }{ 1 \ mol \ I}\)
Multiply this fraction by the number of moles found above.
\(0.2922617071 \ mol \ I*\frac{ 126.9045 \ g\ I }{ 1 \ mol \ I}\)
Multiply. The moles of iodine will cancel.
\(0.2922617071 *\frac{ 126.9045 \ g\ I }{ 1 }\)
The 1 as a denominator is insignificant.
\(0.2922617071 *{ 126.9045 \ g\ I }\)
\(37.08932581 \ g \ I\)
3. Round
The original measurement of 1.76*10^23 has 3 significant figures (1, 7, and 6). Therefore we must round our answer to 3 sig figs. For this answer, that is the tenths place.
\(37.08932581 \ g \ I\)
The 8 in the hundredth place tells us to round the 0 up to a 1.
\(\approx 37.1\ g \ I\)
There is about 37.1 grams of iodine in 1.76*10^23 atoms.
1. which of the following elements is NOT multivalent?
A. Be
B. Cu
C. Pb
D. Fe
Answers
Answer: it is A .
hope this helps!!!!
Explanation:Be is not multivalent
Consider the following balanced redox reaction:2CrO₂⁻(aq) + 2H₂O(l) + 6ClO⁻(aq) →
2CrO₄²⁻(aq) + 3Cl₂(g) + 4OH⁻(aq) (d) Which species is the reducing agent?
Answers
The balanced redox reaction are given below
2CrO₂⁻(aq) + 2H₂O(l) + 6ClO⁻(aq) →2CrO₄²⁻(aq) + 3Cl₂(g) + 4OH⁻(aq)
The Cr species is reducing agents .
There are following steps involve in balanced redox reaction in basic medium .
Divide the reaction into two half reactions .Balance the elements other than oxygen and hydrogen .Balance the oxygen atom by adding \(H_{2} O\) .Balance the hydrogen atom by adding \(H^{+}\) .Balance the charge by adding \(e^{-}\) .Add \(OH^{-}\) on both side Neutralize by combing \(OH^{-}\) and \(H^{+}\) .Add the half reaction and simply .The species which reduces the other species in the redox reaction is called oxidizing agent . Similarly , the species which oxidize the other species in the redox reaction is called reducing agent .
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Describe the general trends in the following properties in group 13 in the periodic table:
- density
- boiling point
- melting point
- reactivity
- atomic radius
Answers
Group 13 in the periodic table consists of the elements boron (B), aluminum (Al), gallium (Ga), indium (In), and thallium (Tl).
What is periodic table?The periodic table is rows and columns arrangement of chemical elements.
The general trends for the properties mentioned:
Density: The density of elements generally increases from boron to thallium. Boron has low density of 2.34 g/cm³ while thallium has a higher density of 11.85 g/cm³.
Boiling point: The boiling point of the elements generally decreases down the group. Boron has the highest boiling point at 4275°C, and thallium has the lowest boiling point at 1457°C.
Melting point: The melting point of elements decreases down the group. Boron has the highest melting point at 2075°C, and thallium has the lowest melting point at 303°C.
Reactivity: The elements in Group 13 have three valence electrons and can lose these electrons to form +3 ion. Reactivity of elements increases down the group, with boron being the least reactive and thallium being most reactive.
Atomic radius: The atomic radius of elements increases down the group. This is because number of energy levels increases down the group, and outer electrons are further from the nucleus.
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A lunar eclipse occurs on the full moon give reason
Answers
For lunar eclipse, the sun and moon must be at opposite side of the earth. this happens only in full moon.
Hence, We get a lunar eclipse only during a full moon.
How many moles of silver are 8.46 x 10 24 atoms of silver?
Answers
Answer:
Answer and Explanation: To determine the number of moles of silver (Ag), we simply need to divide the number of atoms of Ag by the Avogadro's number, N , which is equal to 6.02 10 atoms of Ag per mole of Ag. Therefore, c) 6.3 moles of Ag are present in a sample of 3.8 10 atoms Ag.
A chemist found a 60.00 gram sample containing copper and oxygen. Given the following percent composition, what is the mass of copper in the sample?
Copper- 57.08 %
Oxygen- 42.9296
choose an answer:
O 0.5708 g Cu
o 25.02 g Cu
34.25 g cu
63.5 g Cu
Answers
Please help me
What type of action is happening to location B?
Group of answer choices
subduction
divergent
convection
conduction
Answers
Answer:
divergent
Explanation:
I believe it is divergent.
An element has two naturally occurring isotopes. One has an abundance of 37.4% and an isotopic mass of 184.953 amu, and the other has an abundance of 62.6% and a mass of 186.956 amu. What is the atomic weight of the element
Answers
An element has two naturally occurring isotopes. One has an abundance of 37.4% and an isotopic mass of 184.953 amu, and the other has an abundance of 62.6% and a mass of 186.956 amu. 186.26 amu is the atomic weight of the element.
To calculate the atomic weight of the element, you need to multiply the isotopic mass of each isotope by its abundance, and then sum up the results. The atomic weight (also known as atomic mass) is the weighted average of the masses of the isotopes present in a naturally occurring sample of the element.
Let's perform the calculation:
Atomic weight = (abundance₁ * mass₁) + (abundance₂ * mass₂)
According to question:
Isotope 1: Abundance = 37.4%, Mass = 184.953 amu
Isotope 2: Abundance = 62.6%, Mass = 186.956 amu
Atomic weight = (0.374 * 184.953) + (0.626 * 186.956)
Atomic weight = 69.08 + 117.18
Atomic weight = 186.26 amu
Therefore, the atomic weight of the element, based on the given isotopic abundances and masses, is approximately 186.26 amu.
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A .952 L container of gas is exerting a pressure of 108 kPa while at a temperature of 48 C. Calculate the pressure of this same amount of gas in a 1.236 L container at a temperature of 64 C.
Show Your Work
Answers
Answer:
87.33 kPa (2 d.p.)
Explanation:
To solve this problem, use the combined gas law.
Combined Gas Law\(\boxed{\sf \dfrac{P_1V_1}{T_1}=\dfrac{P_2V_2}{T_2}}\)
where:
P₁ is the initial pressure.V₁ is the initial volume.T₁ is the initial temperature (in kelvin).P₂ is the final pressure.V₂ is the final volume.T₂ is the final temperature (in kelvin).As we want to find the final pressure, rearrange the formula to isolate P₂:
\(\sf P_2=\dfrac{P_1V_1T_2}{T_1V_2}\)
As the temperatures have been given in Celsius, we need to first convert the temperatures from Celsius to kelvin by adding 273.15:
\(\implies \sf T_1=48+273.15=321.15\;K\)
\(\implies \sf T_2=64+273.15=337.15\;K\)
The given values are:
P₁ = 108 kPaV₁ = 0.952 LT₁ = 321.15 KV₂ = 1.236 LT₂ = 337.15 KSubstitute the values into the formula and solve for P₂:
\(\implies \sf \sf P_2=\dfrac{108 \cdot 0.952 \cdot 337.15}{321.15 \cdot 1.236}\)
\(\implies \sf \sf P_2=\dfrac{34664.414}{396.9414}\)
\(\implies \sf P_2=87.3287946...\)
\(\implies \sf P_2=87.33\;kPa\;(2\;d.p.)\)
Therefore, the final pressure of the gas is 87.33 kPa (2 d.p.).
Clouds are formed when
1.sunlight causes water droplets to evaporate
2.liquid water condenses on grass and windows.
3.raindrops freeze into tiny pellets and fall to earth.
4.water vapor in the air condenses to form liquid water or ice.
Answers
Answer:
D. Water vapor in the air condenses to form liquid water or ice
Explanation:
took test on e2020
A solution is prepared by dissolving 117 grams of salt (NaCI) in 250 milliliters of water (H_{2}*O) What is the molarity of the solution?
D. 468 M NaCI
C. 8.0 M NaCl
A. 0.47 M NaCI
B. 8 * 10 ^ - 3 * MNaCl
Answers
Taking into account the definition of molarity, the molarity on the solution is 8 M.
Definition of molarityMolar concentration or molarity is a measure of the concentration of a solute in a solution and indicates the number of moles of solute that are dissolved in a given volume.
The molarity of a solution is calculated by dividing the moles of solute by the volume of the solution:
\(Molarity=\frac{number of moles}{volume}\)
Molarity is expressed in units \(\frac{moles}{L}\).
This caseIn this case, you know that:
number of moles= 117 gramsx\(\frac{1 mole}{58.45 grams}\)= 2 moles, where 58.45\(\frac{g}{mole}\) is the molar mass of NaCl.volume= 250 mL= 0.250 L (being 1000 mL= 1 L)Replacing in the definition of molarity:
\(Molarity=\frac{2 moles}{0.250 L}\)
Solving:
Molarity= 8 \(\frac{moles}{L}\)= 8 M
Finally, the molarity on the solution is 8 M.
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How many grams are in 44.8 liter of oxygen gas
at STP?
Answers
Answer:
Pressure= 2 atm
temperature= 273K
volume= 44.8cm
3
=44.* litre
so,By PV=nRT
n=
RT
PV
mole=
0.0821×273
2×44.8
so, no of moles= 3.998=4
hence, 4×6.023×10
23
=24.08×10
23
Explanation:
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At STP, one mole of every elements or molecules contains a volume of 22.4 L. Hence, a volume of 44.8 L of oxygen gas is 2 moles thus weighs 64 g.
What is STP condition?STP is the condition of standard temperature and pressure. A temperature of 298 kelvin and 1 atm pressure is referred to as standard temperature and pressure or STP.
At standard temperature and pressure, one mole of every compound or molecule contains 22.4 liters of the substance. We know that one mole of O₂ gas is 32 g/mol. 32 g of oxygen gas contains 22.41 liters.
The number of moles of 44.8 liters of oxygen is = 44.8/22.4 = 2 moles.
One mole of oxygen gas is 32 g. Hence, 2 moles are 64 g. Hence, the mass in grams of 44.8 oxygen is 64 g.
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The term “ sea of electrons “ refers to
Answers
Answer:
Explanation:
Basically in metallic bonds, valence electrons are not localied which means they can freely move from one atom to another. Thus, they move in "sea of electrons" because in a sea water or waves are freely moving without any localization.
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