This molecule is known as 2-(Phenylethyl) tetrahydrofuran.
Benzene is a colourless liquid chemical at room temperature. It is utilised primarily as a solvent in the pharmaceutical and chemical industries, as a starting material and an intermediate in the synthesis of numerous chemicals, and in gasoline. Both natural and man-made processes produce benzene.
Benzene is one of the most important organic compounds with the chemical formula C₆H₆. Benzene is the parent compound of various aromatic compounds.
2-(Phenylethyl) tetrahydrofuran has a ring structure of benzene (C₆H₅), and an alkyl group (CH₂CH₃) attached to it. The molecule has a total of 16 carbon atoms and 33 hydrogen atoms.
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How mans, gram of HBr would exactly be
required to react with 2g of propyne ?
(Br=80,H=1, c=12) C3 H4+2HBr–> C3 H6 Br2
Answer:
The number of moles of HBr required to react with 2 g of propyne can be calculated by using the balanced chemical equation:
C3 H4 + 2HBr → C3 H6 Br2
The molar mass of propyne is (3 x 12 + 4 x 1) = 40 g/mol
So, 2 g of propyne is equal to 2/40 = 0.05 moles of propyne.
Since 2 moles of HBr are required to react with 1 mole of propyne, then 0.05 moles of propyne would require 0.05 x 2 = 0.1 moles of HBr.
Finally, to find the number of grams of HBr, we multiply the number of moles by its molar mass, which is (1 x 1 + 80 x 1) = 81 g/mol
So, 0.1 moles of HBr is equal to 0.1 x 81 = 8.1 g of HBr.
A certain ore is 21.3% nickel by mass. How many kilograms of this ore would you need to dig up to have 20.0 g of nickel?
If a certain ore is 21.3% nickel by mass. The number of kilograms of this ore would you need to dig up to have 20.0 g of nickel is: 93.897 kg.
How to find the mass of ore?Using this formula to determine the mass of ore
Mass of ore = Mass of nickel / Percentage of nickel by mass
Convert the percentage to decimal form by dividing it by 100
0.213 = 21.3%.
So,
Mass of ore = (20.0 g) / (0.213)
Mass of ore = 93.897 kg
Therefore the mass of ore is 93.897 kg.
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Air has a density of 0.001226 g/ml. What volume of air would have a mass of 1.0 lb? How do I arrive at 3.7 x 10^2 l? I understand the math but not how to put it in scientific notation.
Answer:
3.6999 x 10^2 l.
Explanation:
To find the volume of air with a mass of 1 lb, we can use the density formula:
Density = Mass divided by Volume
Rearranging the formula to solve for volume:
Mass / Density = Volume
Given that the density of air is 0.001226 g/ml, and we want to find the volume of 1 lb of air, we can substitute the following values into the equation:
(1 pound) / (0.001226 g/ml)
To convert pounds to grams, 1 pound equals 453.59 grams.
Volume = 453.59 g/0.001226 g/ml = 369,988.6 ml
Now we can convert from milliliters to liters. 1 liter equals 1,000 milliliters.
Volume = 369.99 l/1000 = 369,988.6 ml
To express it in scientific notation, you can use a factor of 10 to represent the decimal place. You move the decimal point of the number to the left or right until you have only one non-zero digit to the left of the decimal point.
369.99 l = 3.6999 x 10^2 l
So the volume of 1 lb of air is 3.6999 x 10^2 l.
an ion of platinum has a mass number of 195 and contains 74 electrons. How many
protons and neutrons does it contain, and what is its charge?
ompound
Answer:
djffffffffffffffffffffffffffffffffffffffffffffffffffffffffffgk
Explanation:
jdrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrr
Which factor causes chemical weathering
A gravity
B sunlight
C Acids
D wind
Answer:
C
Explanation:
because its the answer
Answer:
acids
Explanation:
acids because if the rain comes from cloud is acid it can be weathered or if the water is slightly acidic
Can you help me with this question
After much experimentation, John discovers a law which says that the wavelengths of light absorbed by hydrogen gas fit into a pattern which he is able to express in a mathematical formula.
Niels has a hypothesis about why the wavelength of light absorbed by hydrogen has a certain value. Niels suggests the orbit of the electron in the hydrogen atom can only have certain radii, and when the electron "jumps" from one orbit to another, it emits light of an energy corresponding exactly to the difference in orbit energies.
About wavelengthIn physics, wavelength is defined as the distance traveled by a wave in one period. Wavelength is represented by the Greek letter lamda (λ). That's why the wavelength formula is often called the Lambda formula.
How to calculate the lambda formula depends on the type of wave. Based on the direction of propagation, waves are divided into two types, namely transverse waves and longitudinal waves.
Transverse waves are waves whose direction of propagation is perpendicular to the direction of vibration. Examples include water waves, string waves, and light waves. Meanwhile, longitudinal waves have a direction of propagation that is parallel to the direction of vibration, for example sound waves.
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hydrogen and oxygen reacts chemically to form water. how much water would form if 14.8 grams of hydrogen reacted with 34.8 grams of oxygen
The mass of water that can be obtained is 2.2 g of water.
What is the mass of the water?We know that in the case that we have here, we are going to depend on the stoichiometry of the reaction and this is very important in the determination of the amount of the water that can be formed.
Now we can see that the reaction equation can be written from the fact that; [tex]2H_{2} (g) + O_{2} (g) ---- > 2H_{2} O(g)[/tex]. Then we can see that in this kind of chemical reaction we have to apply the stoichiometry.
Number of moles of the hydrogen = 14.8g/2 g/mol = 7.4 moles
Number of moles of oxygen = 34.8 g/32 g/mol = 1.1 moles
Given that 2 moles of hydrogen reacts with 1 mole of oxygen
7.4 moles of hydrogen reacts with 7.4 * 1/2
= 3.7 moles
Hence oxygen is the limiting reactant.
1 mole of oxygen produces 2 moles of water
1.1 moles of oxygen would produce 1.1 * 2/1
= 2.2 moles of water
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how we compare an anion and cation
Answer:
Explanation:
An anion is a negatively charged ion, meaning it has gained one or more electrons. A cation is a positively charged ion, meaning it has lost one or more electrons. The charge of an ion can be determined by its atomic number, the number of protons it contains, and the number of electrons it contains. An anion will have more electrons than protons and a cation will have more protons than electrons. An anion will be attracted to positive charges, while a cation will be attracted to negative charges. Anions and cations can also be compared based on their size and shape. Anions are typically larger than cations, and they often have a spherical shape. Cations, on the other hand, are typically smaller and have a more angular shape.
When gaseous hydrogen sulfide and carbon dioxide interact, water vapor and carbon disulfide CS₂ (g) are formed.
Write the thermochemical equation for this reaction by calculating its thermal effect.
The thermochemical equation for this reaction by calculating its thermal effect is H₂S +CO₂ = CS₂ + water vapor.
What is a thermochemical reaction?Thermochemical equations are balanced chemical equations that contain all reactants and products' physical states as well as the energy change. The reaction is endothermic when energy is a reactant, but exothermic when energy is a product.
A thermochemical equation is a stoichiometric chemical equation with a balanced enthalpy change, H. A thermochemical equation in variable form would look like this: A + BC.
Therefore, the thermochemical reaction is H₂S +CO₂ = CS₂ + water vapor.
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Which example is a biotic factor of an aquarium ecosystem?
A) gravel on the bottom of the aquarium
B) algae growing on the glass
C) plastic plants placed in the gravel
D) rock structure
An example of a biotic factor of an aquarium ecosystem is an algae growing on the glass. Option B is the correct answer.
What is a biotic factor?This refers to a living organism that shapes its environment. The examples of biotic factor that make up fresh water ecosystem are: aquatic plants, fish, amphibians,fungi, bacteria, and protists. and algae.
The biotic factors are gropped into : producers, consumers, and decomposers.
The producers, convert abiotic factors into food. They include plants and algae.The consumers do not make their own food .They consume producers or other consumers to get food energy.The decomposers are the organisms that break down organic matter from dead plants and animals into the inorganic components, for example carbon and nitrogen, which are important for life.Learn more about biotic factor on
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Which contains a greater number of atoms: 1 mole of sulfur dioxide gas at STP or 1 mole of methane gas (CH4) at
STP? Explain / prove.
The two mentioned gases have the same number of atoms as they are present at STP.
What is an atom?
An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.
The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.
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Answer the questions for 100 points!
6) The constant is the amount of beverage in each sample. Option C
7) Greater amount of carbon dioxide dissolve at lower temperatures
8) It shows that the hypothesis should be thrown away. Option D
9) The independent variable is the temperature. Option B
What is an experiment?When we talk about an experiment, then we would have to look at the interplay of one or more variables. It is common that when we are doing an experiment, the dependent variable would have to interface with the independent variable.
We can see that in the experiment, we are trying to find out the impact of the temperature on the mass of the carbon dioxide.
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Diethyl ether has a ΔHvap of 29.1 kJ/mol and a vapor pressure of 0.703 atm at 25.0°C. What is its vapor pressure at 81.0°C?
The new Vapor pressure of the dietheylether is 6.52 atm.
What is the vapor pressure?We have to note that the vapor pressure would have to do with the ease with which the substance can be converted from liquid to vapor. In this case we can see that we have about two different temperatures and we are trying to obtain the vapor pressure at each of the temperatures that have been given.
Using the formula;
ln(P2/P1) = -ΔHvap/R(1/T2 - 1/T1)
P2 = final pressure
P1 = initial pressure
ΔHvap = Enthalpy of vaporization
R = constant
T = Temperature
ln(P2/0.703) = -29.1 * 10^3/8.314(1/354 - 1/298)
ln(P2/0.703) = -3651.3(0.0028 - 0.0034)
ln(P2/0.703) = 2.19
(P2/0.703) = e^2.19
P2 = e^2.19 * 0.73
P2 = 6.52 atm
It has a vapor pressure of about 6.52 atm.
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which sector is targeted for the application of hydrogen fuel cells
The power sector is targeted for the application of hydrogen fuel cells.
What is Hydrogen fuel?This type of fuel produces electricity through the combination of hydrogen and oxygen atoms. The hydrogen reacts with oxygen across an electrochemical cell and produces electricity, water, and heat in a very small quantity.
Hydrogen-powered fuel cell electric vehicles doesn't have any carbon emission or greenhouse gases such as carbon dioxide etc which depletes the ozone layer and causes global warming.
It emit none of these harmful substance and only emits water and warm air which makes it a very clean fuel thereby causing a reduction in pollution and reducing the risk of respiratory diseases.
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Explain how you would create a Lewis dot diagram for the following: (1 mark each, 4 marks total) Example: When creating a Lewis Dot diagram for carbon I would look at the periodic table of elements and find that the atomic number is 6. Then I would draw the C. I know that two electrons would go in the first orbit. That leaves 4 electrons in the valence shell. So, the Lewis Dot diagram would look like a C with four dots around it.
a) phosphorus atom
b) chlorine ion
c) beryllium atom
d) calcium ion
a) phosphorus atom - This would have three concentric circles with the outermost circle having five electrons.
b) chlorine ion - This would have three concentric circles with the outermost circle having seven electrons.
c) beryllium atom - This would have two concentric circles with the outermost circle having two electrons
d) calcium ion - This would have four concentric circles with the outermost circle having two electrons.
What is the Lewis dot diagram?We know that the Lewis dot diagram is the kind of representation that can be used to show the number of the electrons that we do have in an element. The number of atoms are shown in electrons that are in the orbits and the orbits are concentric circles that look very similar.
Recall that the orbits that we have in the atom are known to be arranged in energy levels and the energy levels of the atoms of the atoms of the elements play a key role in the Lewis dot structure of the elements that we know.
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Help with the following problems attached!!
1. The mass of8.12 × 10²⁴ atoms of Co is 4.77 × 10^25 g.
2. There are 2.24 x 10²² atoms of carbon in 4.08g of aspirin.
How can the mass be calculated of cobalt?To calculate the mass of 8.12 × 10²⁴ atoms of Co in grams, we need to know the atomic mass of cobalt (Co) in grams per mole. According to the periodic table, the atomic mass of Co is 58.93 g/mol.
We can calculate the mass of 8.12 × 10²⁴ atoms of Co by using the formula:
mass = (number of atoms) x (atomic mass)
mass = (8.12 × 10²⁴ atoms) x (58.93 g/mol)
mass = 4.77 × 10²⁵ g
So, the mass of 8.12 × 10²⁴ atoms of Co is 4.77 × 10²⁵ g.
Aspirin, also known as acetylsalicylic acid, has the chemical formula C9H8O4. To find out how many carbon atoms there are in 4.08g of aspirin, we can use the formula:
(Mass of aspirin) / (molar mass of aspirin) x (number of moles of C in aspirin)
We know the mass of aspirin is 4.08g and we can look up the molar mass of aspirin, which is 180.159 g/mol. To find the number of moles of C in aspirin, we can count the number of C atoms in the formula of aspirin which is 9 atoms, and then multiply that number by Avogadro's number, which is 6.022 x 10^23 atoms/mol.
So the number of carbon atoms in 4.08g of aspirin is:
4.08g / 180.159 g/mol * (9 atoms × 6.022 x 10²³ atoms/mol) = 2.24 x 10²² atoms
So there are 2.24 x 10²² atoms of carbon in 4.08g of aspirin.
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Which labelled part is responsible for the ability of metals to be bent and shaped?
The majority of metals are malleable, meaning they can be bent and moulded without breaking.
define moulding ?
architect a shaped outline, especially one used on cornices, etc.
a formed strip of wood, stone, or other material
a moulded item, a decorative recessed or relieved surface, a decorative plane or curved strip for embellishment or finishing
The majority of metals are malleable, meaning they can be bent and moulded without breaking. This is due to the fact that they are made up of layers of ions that can glide over one another when the metal is twisted, hammered, or pushed. Most metals are ductile because the ions slide over one other and may be drawn/pulled into wires, making them excellent for electric cables.
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Please help guys
92.)-For neutralization 31 cm³. 0,16 N. alkali solution
requires 217 cm³. of H₂SO4 solution. What are the normality and
titer of an H₂SO4 solution? Answer: 0.023 n .; 1.127. 10³ g /
cm³.
93)-What volume is 0,3 N. acid solution is required to
neutralize a solution containing 0,32 g of NaOH in 40 cm³?
Answer: 26,6 cm³.
94)- Neutralization of 1 liter of a solution containing 1,4 g of
KOH requires 50 cm³. of an acid solution. Calculate the
normality of the acid solution. Answer: 0,53 n.
95)-What mass of HNO, was contained in the solution if 35
cm3. of 0,4 N was required to neutralize it? NaOH solution?
What is the titer of a NaOH solution? Answer: 0,882 g, 0,016 g/
cm³.
96)-What mass of NaNO, should be dissolved in 400 g of
water to prepare a 20% solution?
To neutralize a solution containing 0.32 g of NaOH in 40 cm3 requires 26.66 cm3 of 0,3 S. a. acid solution.
What does normalcy mean?The quantity of moles per solution liter is how it is defined. It is utilized to calculate the number of grams that make up the solution's entire volume. It is utilized to calculate the mole ratio in the solution's overall volume. Normality is measured in units.
Calculation
How to calculate volume?
N1V1 = N2V2
normality = molarity x basicity
For sulfuric acid, the basicity is 2.
∴N1=0.3N
V1=?
Normality of NaOH is [0.32/(40×40)]×1000
N2=0.2×1=0.2N
V2=40ml
0.3 x V1 = 0.2 x 40
V1 = 26.6 cm³
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A compound is found to contain 30.4% nitrogen and 69.6% oxygen. If it has a molecular mass of 92.0, what is its molecular formula?
Answer:
Molecular formula = N2O4
Explanation:
Step 1: Assume that the mass of a compound is 100%
Step 2: Calculate the number of moles of each element
Step 3: Represent an empirical formula
Step 4: Divide the number of moles of each element by the least number of moles
Step 5: Write the empirical formula
Step 6: Calculate the empirical mass
Step 7: Represent a molecular formula
Step 8: Solve for n by dividing molecular mass by empirical mass
Step 9: Multiply the subscripts of the empirical formula by the value of n to obtain the molecular formula
Concentration of 20cm³ of sulphuric acid that neutralize 25cm³ of 0.100M of KOH
Concentration of 20cm³ of sulphuric acid that neutralize 25cm³ of 0.100M of KOH, basically is NaOH. 2NaOH + H2SO4 → Na2SO4 + H2O.
What is sulphuric acid?
Sulfuric acid, also known as H2SO4, is a mineral acid. Mattling acid and Oil of vitriol are other names for sulfuric acid. It is basically corrosive and has a strong acidic nature. It acts as an oxidising and dehydrating agent at higher concentrations. It is a syrupy liquid with no odour and no colour.Sulphuric acid is extremely acidic. As a result, it is used in the cleaning of metals, the removal of impurities from oil, the manufacture of chemicals - nitric acid, hydrochloric acid, the synthesis of dye, drugs, detergents, explosives, and so on.Sulfuric acid (CASRN 7664-93-9), also known as hydrogen sulphate, is a strong mineral acid with the formula H2SO4 that is highly corrosive, clear, colourless, and odourless.Sulfuric acid (H2S04) is a corrosive chemical that is harmful to the skin, eyes, teeth, and lungs. Severe exposure can be fatal. Sulfuric acid exposure may cause harm to workers.To learn more about sulphuric acid refers to:
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Write the Net Ionic Equation for the following equations. Molecular Equation: 2AgNO3(aq) + CaBr2(aq) → Ca(NO3)2(aq) + 2AgBr(s) Ionic Equation: 2Ag+(aq) + 2NO3−(aq) + Ca2+(aq) + 2Br−(aq) → Ca2+(aq) + 2NO3−(aq) + 2AgBr(s)
Net Ionic Equation: 2Ag+(aq) + Ca₂ +(aq) + 2Br⁻(aq) → 2AgBr(s)
Net Ionic Formula
A chemical equation for a process called a net ionic equation only includes the species that are involved in the reaction. The spectator ions, which pass through the process unaltered, are not listed.
In this question the steps for this process are as follows:
Step 1: Write out the molecular equation.
2AgNO₃ (aq) + CaBr₂ (aq) → Ca(NO₃)₂ (aq) + 2AgBr (s)
Step 2: Balance the equation.
2AgNO₃ (aq) + CaBr₂ (aq) → Ca(NO₃)₂ (aq) + 2AgBr (s)
Step 3: Write out the ionic equation.
2Ag+ (aq) + 2NO₃⁻ (aq) + Ca₂+ (aq) + 2Br ⁻ (aq) → Ca²⁺ (aq) + 2NO₃⁻ (aq) + 2AgBr (s)
Step 4: Simplify the equation by cancelling out the species that are on both sides of the equation.
2Ag+ (aq) + Ca₂+ (aq) + 2Br⁻ (aq) → 2AgBr (s)
Step 5: The net ionic equation is the final result.
Net Ionic Equation: 2Ag+ (aq) + Ca₂+ (aq) + 2Br ⁻ (aq) → 2AgBr (s)
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if there are 25 red colored glass beads in a bag that contains 150 glass beads, what is the percent of red glass beads? show your calculations.
The percentage of red glass beads would be = 16.67%
What is percentage?Percentage is defined as the part of a portion of a value per 100 and it is represented by the symbol %.
The number of red colored glass beads = 25
The total number of glass beads = 150
The percentage of glass beads that are red colored glass would be;
= 25/150×100
= 2500/150
= 16.67%
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Calculate the mass in grams in a sample containing 2.40×10^23 S03 molecules.
Answer: 31.2 g
Explanation: Given,
2.40 x 10^23 molecules of SO3
number of moles (n) = given number of molecules / total number of molecules
n = 2.4 x10^23/ 6.023 x 10^23
n = 0.39 moles
mass = molecular mass x number of moles(n)
mass in grams = 80 (Molecular mass of SO3) x 0.39
mass in grams = 31.2 g
HELP ASAP PLS PLS PLS 100 POINTS, BRAINLY IF CORRECT
For the Haber process, N2 + 3H2→2NH3, which is the mole ratio of NH3 to H2.
Question 1 options:
2:3
1:3
1:2
3:2
It says 3:2 is wrong so I need different answer pls pls pls.
Answer: 2:3
Explanation: The question is phrased annoyingly. NH3 to H2 means we need to keep our numbers correct.
2NH3 -> 2 mol of NH3.
3H2 -> 3 mol H2.
NH3/H2 = NH3 to H2.
2:3.
2 mol NH3
----------------
3 mol H2.
2:3, not 3:2.
MAKE NOTES ON METHOD OF MIXTURES ELECTRICAL METHOD.
The Method of Mixtures Electrical Method is a method used to determine the electrical conductivity of a material.
What is Electrical Method?The Electrical Method is a geophysical prospecting technique that uses electrical resistivity to map subsurface features, such as geological structures, fractures, and mineral deposits.
It involves measuring the amount of current that passes through a mixture of two materials under the application of a known voltage. The electrical conductivity of each material can then be determined by calculating the ratio of the current to the applied voltage. The electrical conductivity obtained from the Method of Mixtures Electrical Method can be used to characterize materials such as semiconductors and insulators.
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What is equal to equivalent volume of hydrogen (NC)?
Calculate the equivalent weight of the metal if 0.28 L of
hydrogen (NC) was consumed to reduce 1.017 g of its oxide.
According to the question, Equivalent volume of any gas at STP is 22.4 litre. So, Equivalent volume of hydrogen, will be 22.4 litre. Equivalent wt. of metal= 0.025gm
What is the purpose of hydrogen?Hydrogen may be utilized to heat our dwellings and places of business in addition to powering vehicles and producing electricity. To reach net zero, it will be crucial to reduce our carbon emissions significantly.
Where can you find hydrogen?The majority of stars and the sun include it, and the planetary Jupiter is primarily made of it. Less than consistent with similar per million per volume is all that is found when it is a gas present in the air.
Equivalent wt. of metal/Weight of metal =moles of [tex]H_{2}[/tex] ×valency factor
Equivalent wt. of metal/ 1.017 g = (0.28 L/22.4 L) ×2
Equivalent wt. of metal= 0.025gm
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Please I’m timed!!!!
If sec 0 = -7.3 find sin (0 - pi/2)
7.3
-7.3
-0.14
0.14
Answer:7.3
Explanation:
which type of particles make up the lattice in a)ionic compounds b) molecular compounds
Answer: a) ions and b) ions
Explanation:
Compare the bond length for NH3, NF3, and PF3. Explain.
The bond length for NH3, NF3, and PF3 can be compared based on their molecular geometry and the strength of the chemical bonds between the atoms.
NH3 has a bond angle of 107 degrees and a bond length of 1.01 Angstroms. This is due to the presence of a lone pair of electrons on the Nitrogen atom which causes the bond angles to deviate from the ideal tetrahedral angles of 109.5 degrees.
NF3 has a bond angle of 107 degrees and a bond length of 1.1 Angstroms. This is due to the presence of a lone pair of electrons on the Nitrogen atom which causes the bond angles to deviate from the ideal tetrahedral angles of 109.5 degrees.
PF3 has a bond angle of about 101 degrees and a bond length of 1.48 Angstroms. This is due to the fact that the Fluorine atoms are larger than the Nitrogen atoms of NH3 and NF3, and the bond between Phosphorus and Fluorine is stronger and shorter than the bond between Nitrogen and Hydrogen or Nitrogen and Fluorine.
In summary, the bond length of NH3 and NF3 is shorter than that of PF3 due to the smaller size of Nitrogen atoms compared to Phosphorus and the presence of lone pairs on Nitrogen atoms. The bond between Nitrogen and Hydrogen or Nitrogen and Fluorine is weaker than the bond between Phosphorus and Fluorine.
Cos x tan x - cos x = 0
Answers:
0 + n pi, pi/4 + 2n pi
0 + n pi, 5pi/4 + 2n pi
Pi/2 + n pi, 5pi/4 + 2n pi
Pi/2 + n pi, pi/4 + 2n pi
Answer:0+npipi/4+2npi
Explanation:
