Answers
Answer: B. Dehydrogenation
Explanation:
Dehydrogenation. In a particular reaction, styrene is produced by removing hydrogen from ethylbenzene. This is a dehydrogenation reaction.
Related Questions
Determine the heat (q) required to raise the temperature of 80.0 grams of metal from 28.0 °C to 53.0 °C. Assume the specific heat of the material is 0.8 J/g°C. Be sure to use proper labels, fill in all blanks, and use complete sentences where applicable for full credit.
Heat (q) = ______________ J
Mass (m) = ____________ g
heat (s) = ______ J/g°C
Initial temp (T1) = ______ °C
Final temp (T2) = _______ °C
Is the process endothermic or exothermic? _______________________________
Answers
Answer:
Explanation:
m= 80.0 g
Cp=0.8 J/gc
Change in T= 25
q=Cp X m X T =0.8 X 80.0 X 25 =1600J
Postive q or enthalpy makes it endothermic.
All of the following reactions are described as decomposition reactions except
O CuSO4.5H₂O(s) CuSO4(s) + 5H₂O(g).
O 2PbO₂ (s)
2PbO(s) + O₂(g).
O Fe(CO)(I)
Fe(s) + 5CO(g).
O H₂SO3(aq)
SO₂(g) + H₂O(l).
O NO₂(g) + H₂O(l) 4 NO(g) + 2HNO3(aq).
Answers
The reaction NO₂(g) + H₂O(l) 4 NO(g) + 2HNO3(aq) is not a Decomposition Reaction , Option E is the correct answer.
What is a Decomposition Reaction ?A reaction in which a substance break down into two or more substances is called a Decomposition Reaction.
In the given question
the reactions
CuSO4.5H₂O(s)--> CuSO4(s) + 5H₂O(g).
2PbO₂ (s) --> 2PbO(s) + O₂(g).
Fe(CO)(I)-->Fe(s) + 5CO(g).
H₂SO3(aq)-- >SO₂(g) + H₂O(l)
These are all Decomposition Reaction.
The only reaction which is not is the Reaction E
NO₂(g) + H₂O(l) 4 NO(g) + 2HNO3(aq)
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A solution is made by dissolving 38.81 grams of nickel (II) sulfate, NiSO4, in enough water to make 0.467
liters of solution. Calculate the molarity of this solution.
Answers
The molarity of the NiSO₄ solution made by dissolving 38.81 grams of nickel (ii) sulfate, NiSO₄, in enough water to make 0.467 liters of solution is 0.535 M
How do i determine the molarity of the solution?First, we shall obtain the mole of 38.81 grams of nickel (ii) sulfate, NiSO₄. Details below:
Mass of NiSO₄ = 38.81 grams Molar mass of NiSO₄ = 154.75 g/molMole of NiSO₄ = ?Mole of NiSO₄ = mass / molar mass
= 38.81 / 154.75
= 0.25 mole
Now, we shall determine the molarity of the solution. Details below:
Mole of NiSO₄ = 0.25 moleVolume of solution = 10.467 LMolarity of solution = ?Molarity of solution = mole / volume
= 0.25 / 0.467
= 0.535 M
Thus, the molarity of the solution is 0.535 M
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Can you help me with the state of matter part?
Answers
STEP-BY-STEP EXPLANATION
Sodium chloride (NaCl) exists in a solid state cause it possesses a high melting point. NaCl has a strong force attraction between sodium ion and chloride ion and this invole the transferring of electrons from sodium to chloride. Therefore, sodium chloride exists in the solid state.
\(Na^++Cl^-\text{ }\rightarrow\text{ NaCl}\)According to the lab guide, which changes below will you look for in order to test the hypothesis? Check all that apply. changes in shape or size color changes whether changes are easily reversible temperature changes formation of precipitates or gases changes of state (gas, liquid, or solid)
Answers
The correct options are: changes in shape or size, color changes, formation of precipitates or gases, and whether changes are easily reversible.
According to the lab guide, the following changes below will be looked for in order to test the hypothesis: changes in shape or sizecolor changesformation of precipitates or gaseswhether changes are easily reversibleThese changes are the characteristics that will be observed in order to test the hypothesis in the lab. Furthermore, temperature changes and changes of state (gas, liquid, or solid) may also occur and can be observed while testing the hypothesis.
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Answer:
A,B,E,F
Explanation:
Jupiter's mass is more than _________ the mass of the other planets put together.
Answers
Answer:
2.5 times
Explanation:
Jupiter's mass is 2.5 times that of all the other planets in the Solar System combined—this is so massive that its barycenter with the Sun lies beyond the Sun's surface at 1.068 solar radii from the Sun's center.
Explanation: I’ve gotten asked this question in class before
8. A 25.0 mL sample of an H2SO4 solution is titrated with a 0.186 M NaOH solution. The equivalence point is reached with 12.9 mL of base. The concentration of H2SO4 is ________ M. (Hint: write a balanced chemical equation first!)
Answers
Answer:
0.0480 M
Explanation:
The reaction is ...
H₂SO₄ + 2NaOH ⇒ Na₂SO₄ +2H₂O
That is, 2 moles of NaOH react with each mole of H₂SO₄. Then the molarity of the H₂SO₄ is ...
moles/liter = (0.186 M/2)(12.9 mL)/(25.0 mL) ≈ 0.0480 M
Compare protons with electrons.
Answers
Positively charged
Inside nucleus
Mass - 1
Electrons:
Negatively charged
Outside the nucleus
Mass - 1/2000
According to statistics from the Centers for Disease Control, the number of deaths by
AIDS has dropped; however, the slowing decline concerns experts. Considering the data
about new AIDS cases provided in the circle graph, what conclusion can be drawn about
the AIDS epidemic in 2000?
A. AIDS medications are powerful and extremely successful.
B. Most people are not concerned about AIDS.
C. All races are equally affected by the AIDS epidemic.
OD. Many people are still misinformed about the severity of AIDS.
E. More children and teenagers are affected by AIDS than adults.
Answers
Answer:
E. More people from African American ethnic group is affected by AIDS than other groups.
Explanation:
because it is supported by the data provided in the circle graph. The graph shows that 48% of new AIDS cases in 2000 were in the African American population, while only 31% were in the white population and 20% were in the Hispanic population. This indicates that a disproportionate number of African Americans were affected by the AIDS epidemic in 2000. While option D "Many people are still misinformed about the severity of AIDS" is a possible conclusion, but it is not directly stated or implied by the data provided in the graph.
Please help answer these!
Answers
What part of a nuclear reactor slows down chain reactions?
steam turbines
electricity generator
control rods
neutron blaster
Answers
Answer:
The key to generating a steady output of energy is controlling the nuclear fission inside a reactor core. Too few fission events can slow down and ultimately stop the chain reaction. ... The rods sop up some of the ricocheting neutrons, and the fission process slows down.
Explanation:
MARK BRAINLEIST PLZZZ
How many grams of Aluminum Sulfate do you have if you have 2.837x10^26 atoms of Sulfur?
Apparently, the right answer is 5.373x10^4, but I do not know how to get there, please help.
Answers
The mass of Aluminum Sulfate is 5.373 grams if you have \(2.837*10^{26\) atoms of Sulfur .
The molecular formula of Aluminum Sulfate is \(Al_2(SO_4)_3.\) In one molecule of aluminum sulfate, there are 3 sulfur atoms. To calculate the mass of aluminum sulfate, follow the steps below:
Step 1: Calculate the molar mass of aluminum sulfate using the periodic table.Al = 27.0 g/molS = 32.1 g/molO = 16.0 g/mol
(2 × Al) + (3 × S) + (12 × O) = molar mass of \(Al_2(SO_4)_3.\) = 342.2 g/mol
Step 2: Find the number of moles of sulfur in the given number of atoms of sulfur.2\(2.837*10^{26\) atoms of sulfur × 1 mol S/\(6.022 * 10^{23\)atoms S = 0.0470 mol S
Step 3: Use the molar ratio of sulfur to aluminum sulfate to calculate the number of moles of aluminum sulfate.1 mol \(Al_2(SO_4)_3.\) / 3 mol S = 0.333 mol\(Al_2(SO_4)_3.\) per mol S0.0470 mol S × 0.333 mol \(Al_2(SO_4)_3.\)/mol S = 0.0157 mol \(Al_2(SO_4)_3.\)
Step 4: Calculate the mass of aluminum sulfate.0.0157 mol \(Al_2(SO_4)_3.\) × 342.2 g/mol\(Al_2(SO_4)_3.\)= 5.373 g\(Al_2(SO_4)_3.\)
Therefore, the mass of Aluminum Sulfate is 5.373 grams if you have \(2.837*10^{26\) atoms of Sulfur.
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Consider the energy diagram below.
A graph with Reaction Progression on the x axis and Energy on the y axis. A line starts low on the y axis; this section runs horizontally and is labeled A. It rises sharply to a high round peak labeled C. A dotted line continues the initial line to a higher peak Over C, labelled B, and then falls back to the original line, which continues horizontally; this section is labeled D.
Which statement best describes the diagram?
The catalyzed reaction passes through C.
The energy of the catalyst is shown by A.
The reaction pathway through B is faster.
The energy of the reactants with catalyst is at D.
Answers
The statement best describes the diagram is the catalyzed reaction passes through C. Therefore, option A is correct.
What is an energy diagram ?An energy profile is a theoretical representation of a chemical reaction or process as a single energetic pathway as the reactants are transformed into products in theoretical chemistry.
The amount of relative potential energy in each step of a reaction is depicted by an energy diagram. Reactants, transition states, and products are typically depicted on energy diagrams. It may also include intermediates and activation energy, depending on the reaction.
There are two lines on the energy level diagram. The blue line denotes ground state energy, while the red line denotes excited state energy. The horizontal axis represents orbital energy, and the vertical axis represents total system energy.
Thus, option A is correct.
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Which property altered during a chemical change is not altered during a physical change?
A. composition of the matter
B. temperature of the matter
C. volume of the matter
D. phase of the matter
Answers
The property altered during a chemical change that is not altered during a physical change is composition of the matter.
A physical change is one in which no new substance is formed and it is easily reversible.
A chemical change is one that is not easily reversible and no new substance is formed. It may be accompanied by absorption or evolution of heat.
The composition of a substance changes during a chemical change because bonds between atoms break and new bonds are formed. This does not occur during a physical change.
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If a system absorbs 155.0 kJ of heat from its surroundings and the
system does 45.0 kJ of work on its surroundings, what is the change
in the internal energy of the system, in kJ?
Answers
The change in internal energy of the system is 110 kJ.
What is a change in internal energy?Change in internal energy is the difference between the energy absorbed by the system and the work done by the system.
To calculate the change in the internal energy of the system, we use the formula below.
Formula:
ΔU = Q-W............... Equation 1Where:
ΔU = Change in internal energy of the systemQ = Heat absorbs by the systemW = Work done by the system.From the question,
Given:
Q = 155.0 kJW = 45.0 kJSubstitute these values into equation 1
ΔU = 155-45ΔU = 110 kJ.Hence, The change in internal energy of the system is 110 kJ.
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The following two organic compounds are structural isomers to each other. Carefully identify and justify the structural isomers type (skeletal, functional, or positional) with their common molecular formula
Answers
Structural isomers are molecules with the same molecular formula but with different structural formulae. This means that they have the same number and types of atoms, but they are arranged differently. The following two organic compounds are structural isomers of each other.
Carefully identify and justify the structural isomers type (skeletal, functional, or positional) with their common molecular formula.Common molecular formula: C6H14Structural isomers:(i) Hexane: Hexane is a straight-chain alkane with six carbon atoms and no double bonds or rings. The carbon atoms are linked together in a linear or straight-chain configuration in the skeletal isomer. The skeletal isomer differs in terms of the arrangement of atoms in its molecule. This indicates that it is a skeletal isomer.(ii) 2-methylpentane: It is a branched-chain alkane with six carbon atoms and no double bonds or rings. It differs from the first molecule in terms of the location of a methyl group on the second carbon of the five-carbon chain, rather than a straight six-carbon chain. This difference is due to a change in the positioning of the carbon atoms in the molecule. As a result, it is a positional isomer, as it differs by the position of the functional group or substituent. Therefore, the skeletal and positional isomerism types are present between these two compounds.For such more question on molecular
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How much potassium chloride will dissolve in 25 grams of water at 80°C?
Please I need help
Answers
Answer:
The problem provides you with the solubility of potassium chloride,
KCl
, in water at
20
∘
C
, which is said to be equal to
34 g / 100 g H
2
O
.
This means that at
20
∘
C
, a saturated solution of potassium chloride will contain
34 g
of dissolved salt for every
100 g
of water.
As you know, a saturated solution is a solution that holds the maximum amount of dissolved salt. Adding more solid to a saturated solution will cause the solid to remain undissolved.
In your case, you can create a saturated solution of potassium chloride by dissolving
34 g
of salt in
100 g
of water at
20
∘
C
.
Now, your goal here is to figure out how much potassium chloride can be dissolved in
300 g
of water at this temperature. To do that, use the given solubility as a conversion factor to take you from grams of salt to grams of water
17. HAZWOPER training and certification recognizes:
a. A large number (as much as 80%) will self-present or be self-referred victims
b. Awareness level training will promote proper initial triage actions
c.
Victims will use any entrance they can enter at the hospital, in addition to the
emergency department entrance
d. Both A and C
Answers
HAZWOPER training and certification recognize:
a large number (as much as 80%) will self-present or be self-referred victimsVictims will use any entrance they can enter at the hospital, in addition to the emergency department entranceThe correct option is both A and C
What is the HAZWOPER training and certification?HAZWOPER (Hazardous Waste Operations and Emergency Response) training and certification recognize that a large number of victims (as much as 80%) in hazardous waste incidents or emergencies will self-present or be self-referred for medical treatment.
Additionally, HAZWOPER training acknowledges that victims may use any entrance they can access at a hospital, not just the emergency department entrance.
This is because individuals affected by hazardous materials may arrive at different areas of the hospital seeking medical assistance.
Therefore, option d. Both A and C are correct statements regarding the recognition of HAZWOPER training and certification.
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Which choice describes the function of the pancreas gland?
A. It secretes hormones that regulate blood sugar levels.
B. It secretes adrenaline to help the body respond to fear.
C. It secretes hormones that regulate water concentration levels.
D. It secretes thyroxine, which is involved in growth.
Answers
Answer:
A. It secretes hormones that regulate blood sugar levels.
Explanation:
The pancreas is the organ that helps in the process of digestion of the food. The location of the pancreas is in the abdomen. It helps in the process of digestion of the food and regulating the blood sugar level in the body. It helps in regulating and controlling the glucose level in the body during the process of digestion. Pancreas produces enzymes that are useful in the process of digestion.
Answer:
A
Explanation:
What changes sodium pellets to liquid
Answers
Answer:
when placed in water, a sodium pellet catches on fire as hydrogen gas is liberated and sodium hydroxide forms. chemical change = fire is a sign of chemical reaction.
Explanation:
When placed in water the sodium pellets catch the fire and liberate the hydrogen gas. On mixing with water solid sodium forms a colorless basic solution.
What are the properties of sodium?Sodium is a soft metal. It is a very reactive element with a low melting point. Sodium reacts very quickly with water, snow, and ice to produce sodium hydroxide and hydrogen. It is an alkali metal and the sixth most abundant metal on earth. It has a silvery white color.
It has a strong metallic luster. On reacting with oxygen it produces sodium oxide which on reacting with the water produces sodium hydroxide.
It is used to improve the structure of certain alloys and soaps. It is also used in the purification of metals. Sodium is also present in sodium chloride, an important compound found in the environment.
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burning 12g of urea raise temp of water by 30C what is the enthalpy of combustion for 1kg urea
Answers
The enthalpy of combustion for 1kg of urea is -1223525.84 J/mol.
Urea is a compound that is used in fertilizers and in some plastics.The enthalpy of combustion for urea is the amount of energy that is released when urea is burned. In order to calculate the enthalpy of combustion for 1kg of urea, we need to use the information that is provided to us in the question. Let us start by writing down the balanced equation for the combustion of urea: CO(NH2)2 + 3/2 O2 → CO2 + 2H2O + N2
The balanced equation shows that 1 mole of urea reacts with 1.5 moles of oxygen gas to produce 1 mole of carbon dioxide, 2 moles of water, and 1 mole of nitrogen gas. The enthalpy change for this reaction is equal to the amount of energy that is released when 1 mole of urea is burned.
The heat of combustion (ΔHc) of urea is -632.6 kJ/mol. This means that 632.6 kJ of energy is released when 1 mole of urea is burned. We know that 12g of urea raised the temperature of water by 30°C. We can use this information to calculate the amount of energy that was released when 12g of urea was burned.
The specific heat capacity of water is 4.18 J/g°C. This means that it takes 4.18 J of energy to raise the temperature of 1 gram of water by 1°C. Therefore, it takes 4.18 x 1000 = 4180 J of energy to raise the temperature of 1 kg of water by 1°C.
We know that 12g of urea raised the temperature of water by 30°C. Therefore, the amount of energy that was released when 12g of urea was burned is:
Energy = mass x specific heat capacity x temperature change
Energy = 0.012 kg x 4180 J/kg°C x 30°C
Energy = 1497.6 J
We can now use this information to calculate the enthalpy of combustion for 1kg of urea:
Enthalpy of combustion = energy released / moles of urea burned
Enthalpy of combustion = 1497.6 J / (0.012 kg / 60.06 g/mol)
Enthalpy of combustion = - 1223525.84 J/mol
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A 192 gram sample of an unknown metal was heated to 412.°C and dropped into a beaker
containing 500 mL of water at 25.0°C. The temperature of the water rose to a final value
of 38.2°C. Determine the specific heat and identity of the unknown metal. (Ignore
heating of the beaker and loss of heat).
Answers
1. The specific heat capacity of the unknown metal is 0.385 J/gºC
2. The identity of the unknown metal is copper
How do I determine the specific heat capacity?We'll begin by obtainig the heat absorbed by the water. This can be can be obtained as follow:
Volume of water = 500 mLMass of water (M) = 500 gInitial temperature (T₁) = 25.0 °CFinal temperature (T₂) = 38.2 °CChange in temperature (ΔT) = 38.2 - 25 = 13.2 °CSpecific heat capacity of copper (C) = 4.184 J/gºC Heat absorbed (Q) =?Q = MCΔT
Q = 500 × 4.184 × 13.2
Q = 27614.4 J
Finally, we shall determine the specific heat capacity of the unknown metal. Details below:
Heat absorbed (Q) = 27614.4 JHeat released (Q) = -27614.4 JMass of unknown metal (M) = 192 gInitial temperature (T₁) = 421 °CFinal temperature (T₂) = 38.2 °CChange in temperature (ΔT) = 38.2 - 412 = -373.8 °CSpecific heat capacity of unknown metal (C) = ?Q = MCΔT
Divide both sides by MΔT
C = Q / MΔT
C = -27614.4 / (192 × -373.8)
C = 0.385 J/gºC
Thus, the specific heat capacity of the unknown metal is 0.385 J/gºC and the identity of the metal is copper
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1. A balloon is inflated to a pressure of 2.55 atm at a temperature of 25 °C. What temperature
(in °C) is required to maintain the same volume if the pressure decreases to 1.39 atm?
Answers
Answer :
-111°C
Hope it helps
The final temperature of the gas in the balloon is equal to -110.6°C.
What is Gay Lussac's law?Gay-Lussac's law can be described as when the volume of the gas is kept constant then the pressure (P) is directly proportional to the absolute temperature (T in kelvin) of the gas.
The mathematical representation of Gay Lussca's law can be written as follows:
P/T = k
The pressure (P) of a gas is always directly proportional to the temperature (T) of the gas.
P ∝ T (where volume is constant)
\(\frac{P_1}{T_1} =\frac{P_2}{T_2}\)
Where P₁, T₁, P₂, and T₂ are the initial and final pressure and temperature.
The initial temperature of the balloon, T₁ = 25 °C = 25 + 273 = 298 K
The initial pressure of the balloon, P₁ = 2.55 atm
The final pressure of the balloon, P₂ = 1.39 atm
Substituting temperatures and pressures of the gas in the balloon in the above equation:
2.55/298 = 1.39/T₂
T₂ = 162.4 K
T(K) = 273 + T(°C)
T(°C) = 162.4 - 273 = - 110.6°C
Therefore, the final temperature of the gas inside the balloon is -110.6°C.
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A silver bar has a mass of 368g. What is the volume in cm³ of the bar? The density of silver is 19.5g/cm³.
Answers
Answer:
18.87 cm³Explanation:
The volume of a substance when given the density and mass can be found by using the formula
\(volume = \frac{mass}{density} \\\)
From the question we have
\(volume = \frac{368}{19.5} \\ = 18.871794..\)
We have the final answer as
18.87 cm³Hope this helps you
Why is it when you add 4 electrons to Beryllium it becomes a neutral atom?
Answers
because since there are now 4 electrons(-) you can tell that it had 4 protons (+) before so -4+4 is 0 which makes it neutral. hope it helps.
Answer:
Because it takes 8 electron's to become a netural atom there fore when you add 4 electrons to Beryllium it becomes a netural atom and a stable substadnce.
Explanation:
What coefficients do you need to balance the following equation?
Li+ AlCl3 LiCl + Al
Answers
You must balance the following equation using the LiCl + Al (lithium + aluminum chloride) constants.
Li cl2 and LiCl balance in what way?Always keep in mind that when balancing equations, only the integers in front of compounds can be changed. To balance the Cl atoms in the equation, add a "2 in front of LiCl on the product side. To balance the Li atoms on the reactants side of the equation, put a "2" in front of the Li.
How does L appear in a chemical equation?The (l) symbol indicates that the substance is a liquid. The (aq) symbol indicates that the compound is dissolved in water and stands for aqueous in water.
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Consider the reaction of solid aluminum iodide and potassium metal to form solid potassium iodide and aluminum metal.
Write the balanced chemical equation for the reaction.
Answers
The balanced chemical equation is AlI₃(s) + 3 K(s) → 3 KI(s) + Al(s). The number of moles of aluminium will be 2.437moles.
What is chemical equation ?Chemical equations are symbols and chemical formulas that depict a chemical reaction symbolically.The reactive species and end product are described by the chemical equation. The mole ratio or molecular ratio of the constituent components or compounds in the reaction is revealed by the coefficient of the reacting species and the products that are produced.Reactants are the substance(s) in a chemical equation to the left of the arrow. A component that is present at the outset of a chemical reaction is known as a reactant. Products are the substance(s) to the right of the arrow. A substance that remains after a chemical reaction is complete is known as a product.To learn more about chemical equation refer :
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Which of the following species has the greatest
number of electrons?
1. Cl-
2.K
3. Ca2+
4. S
5. K+
Answers
Answer:
Cl-
Explanation:
Neutral (Cl) have 7 electron, but Cl- have 8 electron due to gain of 1 electron
Before tackling this problem, be sure you know how to find the antilog of a number using a scientific calculator.
A solution has a pH of 5.4. Write the formula you will use to calculate the [H+] and then show all your work leading to the determination of [H+].
Answers
A solution has a pH of 5.4, the determination of [H+].
Given :- pH:- 5.4 pH = - log[H+]To find :- concentration of H+Answer:- Antilog(-5.4) or 4× 10-⁶Explanation:- Formula:- pH = -log H+Take negative to other side
-pH = log H+
multiple Antilog on both side
(Antilog and log cancel each other )
Antilog (-pH) = [ H+ ]
New Formula :- Antilog (-pH) = [+H]
Now put the values of pH in new formula
Antilog (-5.4) = [+H]
we can write -5.4 as (-6+0.6) just to solve Antilog
Antilog ( -6+0.6 ) = [+H]
Antilog (-6) × Antilog (0.6) = [+H]
\(Antilog (-6) = {10}^{ - 6} , \\ Antilog (0.6) = 4 \)
put the value in equation
\( {10}^{ - 6} \times 4 = [H+] \\ 4 \times {10}^{ - 6} = [H+]\)
What does a control group show in an experimental investigation?
Answers
Answer:
the effects that the scientists are causing by manipulating varuables