The evidence that allows you to conclude that your product is trans-9-(2-phenylethenyl) anthracene using melting point data is that it matches the reported melting point range.
Melting point is the temperature at which a solid changes into a liquid. The melting point of a substance is used to characterize it as a physical property. It's critical to the determination of a substance's identity. When heated, a sample is observed to turn into a clear liquid, which is a clear indicator of the melting point. Tips for analyzing melting point data. The melting point is determined by carefully heating the sample in a capillary tube and observing the temperature at which it turns into a clear liquid. When dealing with melting point data, the following guidelines should be followed: Observe the physical state of the sample. Observe the heating rate. Observe the apparatus calibration. Check for impurities in the sample, if any. Apply the range of melting point. Observe the color of the sample in the liquid and solid phases. Observe the time of melting point. Data for melting point.
The range of melting point for trans-9-(2-phenylethenyl) anthracene is from 196 to 199 °C. If the melting point range of your product matches with the reported melting point range, it is safe to assume that your product is trans-9-(2-phenylethenyl)anthracene.
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NOTE: The question given on the portal is incomplete, here's the complete question.
QUESTION: Using your melting point data and thin layer chromatogram, what evidence allows you to conclude that your product is Trans-9-(2-phenylethenyl) anthracene.
We did not do the TLC in lab, but still need to answer the question, but I cant find any info on this compound specifically, please help
Oxoacids have the general formula illustrated, where the number of bonds to the central element E can vary. For the same element E, acid strength will _____ as the number of O atoms increases. For the same number of O atoms, acid strength increases as the _____ of element E increases. Multiple choice question. decrease; electronegativity
Answer:
Hence the correct answer is increase, electronegativity.
Explanation:
Oxoacids have the general formula illustrated, where the number of bonds to the central element E can vary. For the same element E, acid strength will increase as the number of O atoms increases. For the same number of O atoms, acid strength increases as the electronegativity of element E increases.
write the equbilibrium constant expression for each of the following reaction CO(g)+H2O(g)⇄CO2(g)+H2(g)
Answer: Kc, is 1.845 at a given tempera
Explanation:
pleaseee HELPPP!!!! Pleaseeeee
Answer:
Oxidation takes place at anode
Reduction takes place at cathode
In the equation Zn has changed to Zn2+. This means oxidation number of Zn has increased from 0 to +2. So Zn is oxidised.
In CuSO4 , Cu2+ and SO4 2- ions are present.
Cu2+ has changed to Cu(s) meaning oxidation number of Cu has reduced from +2 to 0. So Copper is reduced.
So Copper rod is the cathode since it has been reduced and Zn rod is the anode because it has been oxidised.
Also electrons always move from anode to cathode so that also shows us Copper is the cathode
PLEASE ANSWER QUICK RIGHT ANSWERS ONLY WILL MARK BRAINLIEST
Explanation:
To find the freezing point of the solution, we can use the freezing point depression equation:
ΔT = Kᵣ x m
Where ΔT is the change in freezing point, Kᵣ is the freezing point depression constant of benzene, and m is the molality of the solution.
Substituting the values from the problem, we get:
ΔT = 5.12 °C/m x 2.8 m
ΔT = 14.34 °C
Since ΔT = Tᵢ - T, where Tᵢ is the freezing point of the solvent (benzene) and T is the freezing point of the solution, we can rearrange the equation to solve for T:
T = Tᵢ - ΔT
T = 5.50 °C - 14.34 °C
T = -8.84 °C
Therefore, the freezing point of the solution is -8.84 °C.
Answer:The freezing point of the solution is -8.84 °C.
Explanation:
An experiment is designed to determine the hunting preferences of grey wolves in Yellowstone. What kind of experiment is this?
1. a natural experiment
2. a controlled experiment
3. a field experiment
4. an independent experiment
Answer:
Fuel experiment
Explanation:
since it involves direct observation of the animals
2H2O(g) -- 2H2(g) + O2(g)
What total volume of gas (at STP) is produced by the electrolysis of 4 moles of H2O?
Explanation:
\(v = vdm \times n\)
Vdm=22.4dm.
mole(n)=4 mol
therefore the total volume
\(v = 22.4 \times 4 \\ v = 89.6dm\)
What properties can be predicted in other elements in the same group as one we have them for?
When looking at elements within the same group on the periodic table, there are several properties that can be predicted based on the behavior of other elements in that group.
These properties include:
1. Atomic radius: As you move down a group, the atomic radius tends to increase. This is because there are more energy levels in the atom, which means that the outermost electrons are farther away from the nucleus.
2. Electronegativity: Electronegativity is the ability of an atom to attract electrons towards itself. In general, as you move down a group, electronegativity decreases. This is because the electrons are farther away from the nucleus, which means that they are less strongly attracted to the atom.
3. Ionization energy: Ionization energy is the energy required to remove an electron from an atom. As you move down a group, ionization energy tends to decrease. This is because the electrons are farther away from the nucleus, which means that they are less strongly attracted to the atom and are easier to remove.
4. Reactivity: The reactivity of an element can be predicted based on its position in the periodic table. For example, elements in group 1 (the alkali metals) are highly reactive because they have only one valence electron, which is easily lost in a chemical reaction. Similarly, elements in group 7 (the halogens) are also highly reactive because they have only one electron short of a full valence shell, which makes them eager to gain an electron in a reaction.
In summary, by examining the behavior of other elements in the same group, we can make predictions about properties such as atomic radius, electronegativity, ionization energy, and reactivity for other elements in that group.
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By referring to the particulate theory of mater, explain the following statement: Oxygen gas is very easy to compress when pressure is applied
By referring to the particulate theory of matter, explain the following statement: A solid lump of iron has a high density .
Answer:
See explanation
Explanation:
According to the particulate theory of matter, gas particles do not interact with each other. A gas is composed of isolated particles moving at high velocities and collide frequently with each other and the walls of the container.
Since the particles of a gas are mostly isolated, it is easy to compress the gas when pressure is applied thereby bringing the gas particles closer together.
On the other hand, in the solid state, the particles that compose matter are close together. These particles only vibrate about their mean positions due to strong intermolecular interaction between particles. The fact that the particles of the solid ion are so close together makes the solid iron lump to possess high density.
How many bromine atoms are present in 38.7 g of CH2Br2
Number of Br atoms : 2.679 x 10²³
Further explanationThe mole is the number of particles contained in a substance
1 mol = 6.02.10²³
Moles can also be determined from the amount of substance mass and its molar mass
\(\tt mol=\dfrac{mass}{MW}\)
Proust stated the Comparative Law that compounds are formed from elements with the same Mass Comparison so that the compound has a fixed composition of elements
mass of Br in CH₂Br₂\(\tt mass~Br=\dfrac{2.Ar~Br}{MW~CH_2Br_2}\times mass~CH_2Br_2\\\\mass~Br=\dfrac{2.80}{174}\times 38.7=35.59~g\)
mol of Br\(\tt \dfrac{35.59}{80}=0.445\)
number of atoms\(\tt 0.445\times 6.02\times 10^{23}=\boxed{\bold{2.679\times 10^{23}}}\)
Please help me with this question
Which of the following has maximum -I effect?
\(-NO_2\)Since it has 3 electronegative atoms so it attracts the electron intensity which in turn shows the -I effect...~
It is be a electrophilic compound so electron loving.
Yes NO_2 has maximum -i effect
What part of the atom can be used to figure out the name of the element
Answer:
number of protons
Explanation:
The number of protons determines an element's atomic number and is used to distinguish one element from another.
what term describes the calculations used to relate the amounts of reactants and products in a chemical reaction
The term that describes the calculations used to relate the amounts of reactants and products in a chemical reaction is stoichiometry.
Stoichiometry is the branch of chemistry that deals with the quantitative aspects of chemical reactions. It involves the calculation of the ratios of reactants and products involved in a chemical reaction based on their chemical formulas and the balanced chemical equation.
Stoichiometry helps to determine the amount of product that can be produced from a given amount of reactant, the amount of reactant required to produce a given amount of product, and other related quantities. The calculations of stoichiometry are essential for the accurate prediction of the results of chemical reactions, for example, for the optimization of industrial processes.
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Which of the following has mass?
A. Space
B. Light
C. Matter
Ο Ο
D. Force
Answer:
matter should be the answer
Explanation:
Hope this helps!
Answer:
matter because matter makes up everything in the world EVERYTHING like this computer ri am typing on? matter. what ever device you are using to view this? matter. everything is made of matter. matter is starting to sound weird now so I'm gonna stop saying it and this is the end of the answer remember THAT ANSWER IS MATTERR!!!!!
Convert 4.92 L of hydrogen at STP to moles.
a 0.202 mol H2
b 0.444 mol H2
C 0.220 mol H2
d 4.55 mol H2
Answer:
c. 0.220 mol H₂
Explanation:
No. of moles
Volume present / Volume at STP4.92 L / 22.4 L0.220 mol H₂\({\huge{\fcolorbox{yellow}{red}{\orange{\boxed{\boxed{\boxed{\boxed{\underbrace{\overbrace{\mathfrak{\pink{\fcolorbox{green}{blue}{Answer}}}}}}}}}}}}}\)
\( \sf C) \: 0.220 \: mol \: H_2\)
Explanation:
1 mol = 22.4 litres
4.92 = how many moles?
\( \sf \implies \frac{4.92}{22.4} \\ \\ \sf \implies 0.2196 \\ \\ \sf \implies 0.220 \: mol \: H_2\)
25cm3 of a 0.4M sodium hydroxide solution was diluted into 250cm3 of water. What is the molarityof the resultant solution.
Answer:
0.04 M
Explanation:
From the question given above, the following data were obtained:
Initial volume of solution (V1) = 25 cm³
Initial Molarity of solution (M1) = 0.4 M
Final volume of solution (V2) = 250 cm³
Final Molarity of solution (M2) =?
We can obtain the final Molarity of the solution by using the dilution formula as illustrated below:
M1V1 = M2V2
0.4 × 25 = M2 × 250
10 = M2 × 250
Divide both side by 250
M2 = 10/250
M2 = 0.04 M
Therefore, the resulting molarity of the diluted solution is 0.04 M
1SnO2 + 2H2 = 1Sn + 2 H2O. What is the theoretical yield of Sn that you
will produce if you start with 6.5 grams H2?
Answer: 193 grams
Explanation:
The gram-formula mass of elemental hydrogen is about 2 g/mol, meaning that if you consume 6.5 grams of elemental hydrogen, you will consume 6.5/2 = 3.25 moles.
This means that since for every 2 moles of hydrogen consumed, 1 mole of tin is produced, we need to find the mass of 3.25/2 = 1.625 moles of tin.
Since tin has an atomic mass of 118.71 g/mol, the theoretical yield of Sn is (118.71)(1.625) = 193 grams.
Empty beaker weighs 26.33 g and total mass (filled with water and contents) is 409.75 g. Using D= 1.00 g/mL as density of water. Find volume that a beaker holds.
Answer
383.42 mL
Explanation
Given:
Mass of the empty beaker = 26.33 g
Total mass (filled with water and contents) = 409.75 g
Density of water = 1.00 g/mL
What to find:
The volume that the beaker holds.
Step-by-step solution:
The volume that the beaker holds will be equal to the volume of water in the beaker.
Mass of water = Total mass - Mass of empty beaker
Mass of water = 409.75 g - 26.33 g
Mass of water = 383.42 g
Since Density = Mass/Volume, then
Volume = Mass/Density
Putting mass = 383.42 g and density = 1.00 g/mL
Volume = 383.42 g/1.00 g/mL
Volume = 383.42 mL
Hence, the volume that the beaker holds is 383.42 L
what is the difference between double salt and complex salt
Answer:
The main different of double salt and complex salt is that a double salt is a combination of two salt compounds whereas a complex salt is a molecular structure that is composed of one or more complex ions.
large organic molecules are built on a carbon skeleton, but their unique chemical properties are determined primarily by _______________________________ that are attached to the carbon skeleton.
large organic molecules are built on a carbon skeleton, but their unique chemical properties are determined primarily by functional groups that are attached to the carbon skeleton.
The functional groups are the grouping of the components in which the different chemical reaction of theses molecule are depends. The unique chemical properties are determined by the the primarily functional groups.
The few example of functional group is given below as :
C₂H₅OH CH₃COCH₃ CH₃ CH₂ CH₂CHO
Ethanol Propanone Butanal
Alcohol Ketone Aldehyde
These are the some examples of functional groups.
Thus, the unique properties are determine by the functional groups that are attached to the carbon skeleton.
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A 100.0 mL sample of 0.20 M NaOH is titrated with 0.10 M HBr. Determine the pH of the solution after the addition of 300.0 mL HBr. (Hint: consider the total volume)
The pH of the solution after the addition of 300.0 mL of 0.10 M HBr to a 100.0 mL sample of 0.20 M NaOH can be calculated to be 10.60.
First, we need to determine the number of moles of NaOH present in the initial solution:
moles NaOH = Molarity × volume (L)
moles NaOH = 0.20 mol/L × 0.100 L
moles NaOH = 0.020 mol
Next, we need to determine the number of moles of HBr that have been added to the solution:
moles HBr = Molarity × volume (L)
moles HBr = 0.10 mol/L × 0.300 L
moles HBr = 0.030 mol
Since NaOH and HBr react in a 1:1 ratio, the number of moles of NaOH remaining after the reaction is:
moles NaOH remaining = initial moles NaOH - moles HBr added
moles NaOH remaining = 0.020 mol - 0.030 mol
moles NaOH remaining = -0.010 mol
However, we cannot have a negative number of moles, so we know that all of the NaOH has reacted, and the excess HBr is present in solution. We can calculate the concentration of HBr after the reaction as follows:
total volume = initial volume NaOH + volume HBr added
total volume = 0.100 L + 0.300 L
total volume = 0.400 L
[HBr] = moles HBr / total volume
[HBr] = 0.030 mol / 0.400 L
[HBr] = 0.075 mol/L
To calculate the pH, we need to determine the pOH of the solution, which can be calculated using the concentration of hydroxide ions:
pOH = -log[OH⁻]
Since HBr is a strong acid, we can assume that all of the HBr will react with the remaining NaOH, leaving only water and the conjugate base of HBr, Br⁻, in solution. The concentration of hydroxide ions can be calculated using the concentration of the conjugate base:
[OH⁻] = Kw / [Br⁻]
where Kw is the ion product constant of water (1.0 × 10⁻¹⁴)
[OH⁻] = 1.0 × 10⁻¹⁴ / 0.075 mol/L
[OH⁻] = 1.33 × 10⁻¹³ mol/L
pOH = -log(1.33 × 10⁻¹³)
pOH = 12.88
Finally, we can calculate the pH using the equation:
pH = 14 - pOH
pH = 14 - 12.88
pH = 1.12
Therefore, the pH of the solution after the addition of 300.0 mL of 0.10 M HBr is 10.60.
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how many significant figures are in this number? 22.0 grams
Answer:
Hey there!
22.0 has three significant figures.
Let me know if this helps :)
The muscle that pumps blood throughout your body is:
Cardiac muscle
Valentine muscle
Skeletal muscle
Smooth muscle
Answer:
cardiac
Explanation:
What kind of weather does a cold front usually bring?
Please select the best answer from the choices provided
A warm
B stormy
C sunny
D windy
Answer:
Sunny and windy but mostly windy
How many moles of iron are there in 2. 34 x 10^22 iron atoms
There are approximately 0.0387 moles of iron in 2.34 × 10^22 iron atoms.
To calculate the number of moles of iron, you can use Avogadro's number, which states that there are approximately 6.022 × 10^23 atoms in one mole of a substance.
First, let's determine the number of moles of iron atoms in 2.34 × 10^22 iron atoms:
Number of moles = (Number of atoms) / (Avogadro's number)
Number of moles = (2.34 × 10^22) / (6.022 × 10^23)
≈ 0.0387 moles
As the temperature decreases, the kinetic energy of the iron atoms decreases, and eventually, they are no longer able to overcome these intermolecular forces. As a result, they begin to settle into a regular crystal lattice, and the iron solidifies.
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define chocolate and its characteristics.
Chocolate is a food product made from roasted and ground cacao pods, that is available as a liquid, solid or paste, on its own or as a flavouring agent in other foods. The seeds of the cacao tree have an intense bitter taste and must be fermented to develop the flavour.
Chocolates are solid at ambient (20–25 °C) and melt at oral temperature (37 °C) during consumption giving a smooth suspension of particulate darkens in cocoa butter and milk fat (Beckett, 1999 and Whitefield, 2005).
After fermentation, the beans are cleaned, sorted, graded and then roasted. The bean shells become brittle and the colour of the beans darken. The process converts the flavour precursors within the bean into compounds such as aldehydes, esters, lactones, and pyrazine, which give chocolate its aroma and flavour.
Explain the difference among energy levels
Answer:
Whats the difference between an orbital and an energy level?
The main difference between orbitals and energy levels is that orbitals show the most probable pathway of an electron that is in motion around the nucleus whereas energy levels show the relative locations of orbitals according to the amount of energy they possess.
Explanation:
2. This chart describes several characteristics of human civilizations.
(6.04)
Characteristics of Human Civilizations
Stable Food Supply
?
Developed Systems of Writing
Which phrase best completes this list?
A. Created militaries
B. Complex social structures
C. Use of fire for protection
D. Declining population
Lone pairs around the oxygen atom of a water molecule play no role in determining
its molecular geometry?
O True
O False
False, lone pairs around the oxygen atom of a water molecule play very important role in determining its molecular geometry.
According to the concept of VBT molecular geometry = no of bond pair + no of lone pair . So if the no of lone pair changes geometry also changed.
What is molecular geometry?
Geometry is a three-dimensional structure or arrangement of atoms in a molecule. Molecular geometry is also known as molecular structure. Understanding the molecular structure of a compound can help determine the polarity, reactivity, phase of matter, color, magnetism, as well as the biological activity.
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while brainstorming, karl came up with a list of possible topics consisting of coconuts, cathedrals, clouds, concerts, chemistry, and clay. which technique did he most likely use?
while brainstorming among possible topics consisting of coconuts, cathedrals, clouds, concerts, chemistry, and clay karl used cathedrals most.
Karl most likely generated this list of themes using free association or free-form brainstorming. Using this method, one creates a list of concepts or subjects without any prior structure or order. Without giving any thought to the viability or quality of individual ideas, the objective is to come up with as many as you can in a short period of time. Karl's list has a wide variety of themes, which is a typical result of free association brainstorming.
In order to come up with a lot of ideas quickly, brainstorming is a creative problem-solving strategy. In most cases, a team of individuals collaborates to produce as many ideas as they can, frequently in response to a particular prompt. a difficulty or query. Regardless of the quality or viability of the ideas produced, the purpose of brainstorming is to promote creativity. Free association, thought mapping, and nominal group approach are a few typical brainstorming strategies. A range of settings, including business, education, and the arts, might benefit from brainstorming. A technique for generating ideas and exchanging knowledge to address a specific business or technical problem, brainstorming encourages participants to think freely.
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hydration and solvation which the solvent is water. what is solvation?
Answer:
Solvation is the interaction of a solvent with the dissolved solute—in the case of water, solvation is often referred to as hydration. Solvent polarity is the most important factor in determining how well it solvates a particular solute.
Explanation:
hope this helps :)