Answer:
cause it has more
space between molecules.
O C. Ice has a higher density than li
Explanation:
Benzaldehyde and benzyl alcohol can be distinguished by NMR. The proton on the aldehyde group will appear at approximately _____ ppm; the methylene peak on the alcohol is the only peak ______ ppm for either compound.
Answer:
9-10 ppm.
0.2-0.4 ppm.
Explanation:
The proton on the aldehyde group will appear at approximately 9-10 ppm whereas the methylene peak on the alcohol is the only peak 0.2-0.4 ppm for either compound. Aldehydes and aromatics are quite distinctive in the Nuclear magnetic resonance (NMR). Aldehydes show up from 9-10 ppm, usually as a small singlet; aromatic protons show up from 6.5-8.5 ppm. NMR spectroscopy is the use of NMR to study the physical, chemical, and biological properties of matter.
As the temperature increases from 0°C to 25°C the amount of NH3 that can be dissolved in 100 grams of water.
A) decreases by 10 grams
B) decreases by 40 grams
C) increases by 10 grams
D) increases by 40 grams
Answer:
decreases by 10 gram
Explanation:
What is the mass in grams of 5.50 moles of Copper, Cu?
Answer:
349.503 g
https://www.convertunits.com/from/moles+Copper/to/grams
here is a link, you can convert moles of copper to grams here
The answer is 5.50 moles of Cu (Copper) has 349.503 grams mass .
What is a mole ?
A mole is defined as 6.02214076 × 10²³ atoms, molecules, ions, or other chemical units.
and the molar mass of a substance is defined as the mass of 1 mole of that substance, expressed in grams per mole.
It is equal to the mass of 6.022 × 10 23 atoms, molecules, or formula units of that substance.
1 mole of Cu has 63.546 grams of Cu
So 5.50 moles will have 5.50 * 63.546 grams
=349.503 grams
Therefore 5.50 moles of Cu (Copper) has 349.503 grams mass .
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The total number of sodium atoms in 46.0 grams of sodium
is
Which is a characteristic of aromatic hydrocarbons?
A. Alternating single and double bonds
B. Bonds between oxygen and carbon atoms
C. Oxygen atoms bonded to hydrogen atoms
D. Two hydrogen atoms bonded together
Answer:
A. Alternating single and double bonds
Explanation:
Hydrocarbons i.e. hydrogen and carbon containing compounds, are grouped into two namely: aliphatic and aromatic hydrocarbons. Aliphatic hydrocarbons contains straight or branched chains of carbon and hydrogen atoms in their structure e.g. alkanes, alkenes etc.
On the other hand, aromatic hydrocarbons are cyclic hydrocarbons containing one or more cyclic rings. The benzene ring is the basis of all aromatic hydrocarbons and one characteristics of benzene is that it possesses an alternating single (-) and double bonds (=) in their structure.
Since benzene is a building constituent of aromatic hydrocarbons, an "alternating single and double bond" is a characteristics of aromatic hydrocarbons.
Which type of rock is formed from cooling molten rock?
A.
igneous
B.
magma
C.
metamorphic
D.
sedimentary
Answer:
A. Igneous Rocks
Explanation:
Hope i could help :)
Igneous rocks are formed from cooling molten rock.
• One of the three main kinds of rocks along with metamorphic and sedimentary rocks are the igneous rocks, and they comprise both extrusive and intrusive rocks.
• The formation of igneous rocks takes place when the molten rock cools and crystallizes, either when the melted rock is still within the crust, or at the volcanoes on the surface of the Earth.
• The igneous rocks can possess several kinds of compositions, based on the magma they cool from.
• The two prime categories of igneous rocks are intrusive and extrusive rocks.
Thus, the correct answer is option A, that is, igneous.
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If I have 340 mL of a 0.5 M NaBr solution, what will the concentration be if I add 560 mL more water to it?
Answer:
The correct answer is "0.31 M".
Explanation:
Given,
Volume,
[tex]V_1=340[/tex]
[tex]V_2=560[/tex]
Molarity,
[tex]M_1=0.5[/tex]
Let the M₂ be "x".
By using the dilution formula, we get
⇒ [tex]M_1V_1=M_2V_2[/tex]
then,
⇒ [tex]0.5\times 340=x\times 560[/tex]
⇒ [tex]170=x\times 560[/tex]
⇒ [tex]x=\frac{170}{560}[/tex]
⇒ [tex]=0.31 \ M[/tex]
A 10.00 mL sample of a solution containing formic acid (a weak acid) was placed in a 25 mL volumetric flask and diluted to the mark with water. A 10.00 mL sample of the diluted formic acid solution was then titrated with 0.1322 M sodium hydroxide. The titration required 15.80 mL of sodium hydroxide to reach the equivalence point. Calculate the molarity and the percentage (by mass) formic acid in the original solution. The density of the formic acid solution was found to be 1.02 g/mL.
Answer:
Molarity: 0.522M
Percentage by mass: 2.36 (w/w) %
Explanation:
Formic acid, HCOOH reacts with NaOH as follows:
HCOOH + NaOH → NaCOOH + H₂O
To solve this question we must find the moles of NaOH added = Moles formic acid. Taken into account the dilution that was made we can find the moles -And molarity of formic acid and its percentage by mass as follows:
Moles NaOH = Moles HCOOH:
0.01580L * (0.1322mol / L) =0.002089 moles HCOOH
Moles in the original solution:
0.002089 moles HCOOH * (25mL / 10mL) = 0.005222 moles HCOOH
Molarity of the solution:
0.005222 moles HCOOH / 0.01000L =
0.522MMass HCOOH in 1L -Molar mass: 46.03g/mol-
0.522moles * (46.03g / mol) = 24.04g HCOOH
Mass solution:
1L = 1000mL * (1.02g / mL) = 1020g solution
Mass percent:
24.04g HCOOH / 1020g solution * 100
2.36 (w/w) %
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Which of the following conditions remain constant in Boyle's law?
Volume and pressure
Density and temperature
Pressure and number of moles
Temperature and number of moles
Answer: Temperature and number of moles are the conditions which remain constant in Boyle's law.
Explanation:
Boyle's law states that at constant temperature the pressure of a gas is inversely proportional to the volume of gas.
Mathematically, it is represented as follows.
[tex]P \propto \frac{1}{V}[/tex]
As equation for ideal gas is as follows.
PV = nRT
And, at constant temperature the pressure is inversely proportional to volume which also means that number of moles are also constant in Boyle's law.
Thus, we can conclude that temperature and number of moles are the conditions which remain constant in Boyle's law.
Answer:
Temperature and number of moles
Explanation:
What is the [OH-] of a solution with a pH of 1.4?
Answer:
If a solution has pH=8 , then its pOH is 14−8=6 and the corresponding concentration of hydroxyl OH− ions is 10−6 mol per litre.
Explanation:
Name and describe the type of bond found in a water molecule.
Answer:
covalent bonds
Explanation:
covalent bonds hold together the hydrogen and oxygen atoms of individual H2O molecules. Covalent bonds occur when two atoms share electrons with each other.
Silver chloride is virtually insoluble in water so that the reaction appears to go to completion. How many grams of solid NaCl must be added to 25.0 mL of 0.366 M AgNO3 solution to completely precipitate the silver
Answer:
0.535 g
Explanation:
The reaction that takes place is:
NaCl + AgNO₃ → AgCl + NaNO₃First we calculate how many AgNO₃ moles are there in 25.0 mL of a 0.366 M solution, using the definition of molarity:
Molarity = moles / litersmoles = Molarity * litersConverting 25.0 mL to L ⇒ 25.0 / 1000 = 0.025 L
moles = 0.366 M * 0.025 L = 0.00915 mol AgNO₃Then we convert AgNO₃ moles into NaCl moles:
0.00915 mol AgNO₃ * [tex]\frac{1molNaCl}{1molAgNO_3}[/tex] = 0.00915 mol NaClFinally we convert NaCl moles into grams, using its molar mass:
0.00915 mol NaCl * 58.44 g/mol = 0.535 gI need the answer fast pls it’s scince
Answer:
more dense
Explanation:
cold air particles are moving slower, because they have less energy.
1. If you made a new voltaic cell with Zn and Ag electrodes, what metal would be the anode and which would be the cathode?
2. In this new cell, what electrode would be oxidized and which will be reduced?
3. In this new cell, what direction would electrons flow?
4. Write the half reaction that occurs at the anode and cathode.
Answer:
Explanation:
1. If you made a new voltaic cell with Zn and Ag electrodes, what metal would be the anode and which would be the cathode?
Zn loses its electron so it is anode. Ag is the cathode.
2. In this new cell, what electrode would be oxidized and which will be reduced?
Oxidation happens at anode which is Zn. Reduction happens at cathode which is Ag.
3. In this new cell, what direction would electrons flow?
Zn -> Ag
4. Write the half reaction that occurs at the anode and cathode.
Zn -> Zn++ + 2e-
2Ag+ + 2e- -> 2Ag
Write a balanced equation for the complete oxidation reaction that occurs when methane (CH4) burns in air.
Answer: The balanced equation for the complete oxidation reaction that occurs when methane (CH4) burns in air is [tex]CH_{4} + 2O_{2} \rightarrow CO_{2} + 2H_{2}O[/tex].
Explanation:
When a substance tends to gain oxygen atom in a chemical reaction and loses hydrogen atom then it is called oxidation reaction.
For example, chemical equation for oxidation of methane is as follows.
[tex]CH_{4} + O_{2} \rightarrow CO_{2} + H_{2}O[/tex]
Number of atoms present on reactant side are as follows.
C = 1H = 4O = 2Number of atoms present on product side are as follows.
C = 1H = 2O = 3To balance this equation, multiply [tex]O_{2}[/tex] by 2 on reactant side. Also, multiply [tex]H_{2}O[/tex] by 2 on product side. Hence, the equation can be rewritten as follows.
[tex]CH_{4} + 2O_{2} \rightarrow CO_{2} + 2H_{2}O[/tex]
Now, the number of atoms present on reactant side are as follows.
C = 1H = 4O = 4Number of atoms present on product side are as follows.
C = 1H = 4O = 4Since, the atoms present on both reactant and product side are equal. Therefore, this equation is now balanced.
Thus, we can conclude that balanced equation for the complete oxidation reaction that occurs when methane (CH4) burns in air is [tex]CH_{4} + 2O_{2} \rightarrow CO_{2} + 2H_{2}O[/tex].
Is nuclear energy good or bad?
Answer:
It is bad
Explanation:
Is nuclear energy good or bad?
Oh no! I dash (lose) my purse
Answer:
Ok
Explanation:
In order to ice to melt it must absorb heat This makes it an blank process.
A) Endothermic
B) exothermic
C) integral
D)Kinematic
Answer: A. Endothermic
Explanation:
In an endothermic reaction, heat is sucked in from the surrounding area by the reactants so that they may use it to react and form new products. This will therefore reduce the temperature in the said surrounding by the amount that the reaction needed.
This is what ice does when it melts. It sucks in the heat surrounding the area and then melts but leaves the area colder. For instance, putting ice in water ensures that the ice melts but because it sucked in the heat from the water to do so, the water gets colder as a result.
a compound decomposes by a first-order process. if 17.0% of the compound decomposes in 60.0 minutes, the half-life of the compound is
Answer:
the half-life of the compound is 223 minutes
Explanation:
Given the data in the question;
compound decomposes by a first-order process,
17% of compound decomposes in 60 minutes,
the half-life of the compound = ?
Since its a first order reaction, we use the expression;
k = 1/t ln( Co/Cf )
given that; t = 30 minutes, Cf = 1 - 17% of Co = 1 - 0.17 of Co = 0.83Co
we substitute
k = ( 1 / 60 min ) ln( Co / 0.83Co )
k = ( 1 / 60 min ) ln( 1 / 0.83 )
k = 0.016667 × 0.186329578
k = 0.003105555
so get the half life;
[tex]t_{1/2[/tex] = 0.693 / k
we substitute
[tex]t_{1/2[/tex] = 0.693 / 0.003105555
[tex]t_{1/2[/tex] = 223.14 ≈ 223 minutes
Therefore, the half-life of the compound is 223 minutes
Which statements correctly describe metallic bonds
Answer:
E. They form because electrons can move freely between atoms.
Explanation:
Metallic bonding is a type of chemical bonding that arises from the electrostatic attractive force between conduction electrons and positively charged metal ions.
In terms of energy, when atoms chemically bond to form a stable compound:_____.
A. Energy is released.
B. Energy can either be released or consumed depending upon the bond formed.
C. Energy is transferred from one atom to another.
D. Energy is consumed.
Answer:
A. Energy is released
Explanation:
Energy is only released when chemical bonds are formed.
28. If the total pressure of a mixture of four gases (neon, carbon dioxide, oxygen and hydrogen) is 1245 mm
Hg, what is the pressure of neon gas if the pressure of carbon dioxide is 145 mm Hg, the pressure of hydrogen is
499 mm Hg and the pressure of oxygen is 228 mm Hg?
A) 601 mm Hg
B) 746 mm Hg
C) 872 mm Hg
D) 373 mm Hg
Answer:
D) 373 mm Hg.
Explanation:
We can solve this problem by keeping in mind Dalton's law of partial pressures, which states that the total pressure of a mixture of gases is equal to the sum of each gas' partial pressures. In other words, for this case:
Total Pressure = Ne Pressure + CO₂ Pressure + O₂ Pressure + H₂ Pressure1245 mm Hg = Ne Pressure + 145 mm Hg + 228 mm Hg + 499 mm HgNe Pressure = 373 mm HgThe answer is option D) 373 mm Hg.
What is the hydrogen ion concentration of a solution with a pH of 2.0?
Answer:
[H+] = 10^-2
Explanation:
pH = -log[H+]
2 = -log[H+]
[H+] = 10^-2
The trisubstituted product was synthesized in one step from an electrophilic aromatic substitution of a disubstituted benzene ring. Draw the disubstituted benzene starting material that would give this regioisomeric product.
Answer:
See explanation and image attached
Explanation:
We know that the substituents that are already present on the benzene ring determine the position of other substituents coming into the ring.
The substituents already present in the ring may be ortho-para or meta directing substituents.
Both -COOH and -NO2 are meta directing because they deactivate the benzene ring towards electrophilic substitution by resonance.
This means that the incoming -Cl electrophile is directed to the meta position. The disubstituted benzene starting material that would give this regioisomeric product must be the one shown in the image attached to this answer.
1. How many moles of hydrogen are needed to completely react with two moles of nitrogen?
_N2 + _H2 -->_NH3
Please hurry it is for a big assignment
N2 + 3H2 --> 2NH3
Answer: 6 moles of hydrogen are needed to react with two moles of nitrogen.
Explanation:
Select all of the abiotic factors in an ecosystem.
Plants
Sunlight
Soil
Animals
Rocks
Dead deer in the forest
Temperature
Answer:
Sunlight, Soil, Rocks, Temperature and dead deer
Explanation:
You could say the dead tree is now an abiotic factor because biotic factors refer to living things
In a thermonuclear device, the pressure of 0.050 liters of gas within the bomb casing reaches 458000 atm. When the bomb casing is destroyed by the explosion, the gas is released into the atmosphere where it reaches a pressure of 1.00 atm. What is the volume of the gas after the explosion
Answer:
22900 L
Explanation:
Assuming the gas behaves ideally, we can solve this problem by using Boyle's law, which states that:
P₁V₁=P₂V₂Where subscript 1 refers to the initial conditions of pressure and volume (within the bomb, namely), while 2 refers to the final conditions.
Meaning that in this case:
P₁ = 458000 atmV₁ = 0.050 LP₂ = 1.00 atmV₂ = ?We input the data:
458000 atm * 0.050 L = 1.00 atm * V₂And solve for V₂:
V₂ = 22900 LWater potential is the potential energy for water to move from one area to another. Water
always moves from a high water potential area to a lower water potential area. According
to the water potential formula, which factors affect the water potential?
a) Pressure and the amount of solute
b) Volume and temperature
c) Surface area and depth
d) Speed and concentration
Answer:
A
Explanation:
The water potential depends upon the pressure and amount of solute according to the water potential formula.
The following points can be considered:
The water potential formula defines as the summation of the solute potential, pressure component, gravimetric component, potential due to humidity, potential due to matrix effects, and the reference correction. The water potential does not depend on the volume and temperature of the system. The water potential does not depend on the surface area and depth of the system. The water potential does not depend on the speed and concentration of the system.Therefore, the correct answer is a) pressure and the amount of solute.
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If 22.5 mol of an ideal gas occupies 30.5 L at 447 K, what is the pressure of the gas?
pressure:
_______________________ atm
Answer:
P = 27.07 atm
Explanation:
Given that,
The number of moles, n = 22.5 mol
Volume, V = 30.5 L
Temperature, T = 447 K
We need to find the pressure of the gas. The ideal gas law is as follows :
[tex]PV=nRT\\\\P=\dfrac{nRT}{V}[/tex]
R = 0.0821 L-atm/mol-K
Put all the values,
[tex]P=\dfrac{22.5\times 0.0821\times 447}{30.5}\\\\P=27.07\ L[/tex]
So, the pressure of the gas is 27.07 atm.
The ability of organisms to function within a specific range of temperatures, salinities, or rainfall amounts?
Answer:
The range of variation under which a species can function and reproduce is called its tolerance range.
Explanation:
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