What type of chemical reaction requires oxygen gas as reactant and releases heat?
Answer:
A combustion reaction is a reaction in which a substance reacts with oxygen gas, releasing energy in the form of light and heat.
Mass is a(n) ____ property.
Answer:
mass is an extensive property..
aldehydes plus potassium permanganate with explanation
\( \large \sf \: answer\)
You can identify the aldehyde from acidic potassium permanganate. Purple colour of acidic potassium permanganate is changed to colourless because aldehyde is oxidized by acidic potassium permanganate.
What is the purpose of cell respiration?
to breath in food
to expel unwanted oxygen
to produce energy from food
Answer:
To produce energy from food
Explanation:
It's pretty much an energy cycle
Given the law of conservation of energy, what happens when a 200°C iron bar is placed in thermal contact with a 30°C block of wood?
When a 200°C iron bar is placed in thermal contact with a 30°C block of wood, energy leaves the iron bar and enters the wood until the temperatures are equal.
Law of conservation of energy states that the energy cannot be lost or formed but it can only be transformed from one form to another.
According to the given question, the block of wood is at a lower temperature than an iron bar. Hence, heat will flow from the iron bar to the block of wood until the temperatures of both are equal.
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an object has a mass of 14g and a volume 3.5 mL. what is the density of the object ?
Given :
Mass of object , M = 14 g .
Volume of object , V = 3.5 mL .
To Find :
The density of the object .
Solution :
Density of an object is given by :
\(Density=\dfrac{Mass}{Volume}\\\\\rho=\dfrac{M}{V}\\\\\rho=\dfrac{14}{3.5}\ g/mL\\\\\rho=4\ g/mL\)
Therefore , the density is 4 g/mL .
Hence , this is the required solution .
Consider the reaction
2NO(g) + O2(g) = 2NO2(g)
Suppose that at a particular moment during the reaction nitric oxide
(NO) is reacting at the rate of 0.066 M/s. (a) At what rate is NO2
being formed? (b) At what rate is molecular oxygen reacting?
Answer:
(a) Rate of formation of NO2 is also 0.066M/s
(b) Rate of reaction of O2 gas is 0.033M/s
Explanation:
(a) in one second, according to the equation,
2 moles of NO combines with 2moles of NO2.
Therefore 0.066M NO will still consume 0.066mole NO2.
(b) According to the equation,
2 moles NO consumes 1 mole O2, 0.0666M will consume 0.0333 mole O2
2. Some nitrogen at a pressure of 35.75 p.s.i is in a 100 L container. If the container's volume is reduced to 2250 ml then what is the resulting pressure?
Answer:
1455.6
Explanation: you first convert 2250ml to l by dividing by 1000 so you get 2.25l then you use Boyles law which is p1v1=p2v2 then insert values
35.75*100=p2*2.25 then divide both sides by 2.25 then you get 1455.6
How long does it take for the moon to make one revolution around Earth?
Answer:
27 days, 7 hours and 43 minutes.
Explanation:
To complete a full orbit around Earth, it takes 27 days, 7 hours and 43 minutes for the Moon. This is called sidereal month and is measured by the Moon's position relative to distant *fixed" stars.
The equilibrium constant, Kp, for the following reaction is 0.160 at 298K. 2NOBr(g) 2NO(g) + Br2(g) If an equilibrium mixture of the three gases in a 15.9 L container at 298K contains NOBr at a pressure of 0.363 atm and NO at a pressure of 0.421 atm, the equilibrium partial pressure of Br2 is _________atm.
Consider the following reaction:
2NH3(g) N2(g) + 3H2(g) If 3.53 * 10-4 moles of NH3, 0.297 moles of N2, and 0.320 moles of H2 are at equilibrium in a 16.6 L container at 945 K, the value of the equilibrium constant, Kp, is ________.
Answer:
1. The partial pressure of Br₂ is 0.118951 atm 2) The value of Kp is 2.843 × 10².
Explanation:
1. The reaction at equilibrium will be:
2NOBr (g) ⇒ 2NO (g) + Br₂ (g)
The partial pressure of PNOBr is 0.363 atm, the partial pressure of NO is 0.421 atm, there is a need to find the partial pressure of Br₂, the value of Kp is 0.160. For the given reaction,
Kp = [PNO]² × [PBr₂] / [PNOBr]²
0.160 = [0.421]² × [PBr₂] / [0.363]²
0.160 = [0.177241 × [PBr₂] / 0.131769
[PBr₂] = 0.131769 × 0.160 / 0.177241
[PBr₂] = 0.118951 atm
The partial pressure of Br₂ is 0.118951 atm.
2) The reaction will be,
2NH₃ ⇔ N2 (g) + 3H₂ (g)
Kp is the equilibrium constant, and its value will be,
Kp = [PN₂] × [PH₂]³ / [PNH₃]² ------------------(i)
Considering the reactants in terms of molarity will be,
Kp = [N2] × [H₂]³ / [NH₃]²
Here, [N2] = 0.297 / 16.6 = 0.017892 M
[H₂] = 0.320/16.6 = 0.019277 M
[NH₃] = 3.53 × 10⁻⁴ / 16.6 = 2.12651 × 10⁻⁵ M
Now putting the values in equation (i) we get,
Kp = [0.017892] × [7.16399 × 10⁻⁶] / [4.52204 × 10⁻¹⁰]
Kp = 0.128167 × 10⁻⁶ / 4.52204 × 10⁻¹⁰
Kp = 2.8343 × 10²
Hence, the equilibrium constant is 2.8343 × 10²
What are three different ways an animal uses energy from its food
Answer:
Animals obtain energy from the food they consume , using that energy to maintain body temperature and perform other metabolic functions. Glucose, found in the food animals eat ,is broken down during the process of cellular respiration into energy source called ATP.
what's the formula for na and f , ca and br , mg and O
Answer:
NaF, CaBr2, MgO
Explanation:
Hi! For this problem, you are going to want to look at the charges of the elements in order to write their formulas.
NaF: Na has a charge of +1 and F has a charge of -1. This means that they have a 1:1 ratio and the formula is written as such - NaF.
CaBr2: Ca has a charge of +2 and Br has a charge of -1. For this problem you want to make sure that their formal charge (the charge of the entire molecule) equals 0. This means that the negative charges need to equal the positive charges. Looking at this, you are going to need to Br ions with a charge of -1 to equal one Ca ion with a charge of +2 - CaBr2.
MgO: Mg has a charge of +2 and O has a charge of -2. This means that they have a 2:2 ratio which simplifies to a 1:1 ratio and the formula is written as such - MgO.
Hope this helps!
what is the product of a reaction 4-acetyl anisole with HI(t°C)?
Answer:
The reaction of 4-acetyl anisole (also known as p-methoxyacetophenone) with hydroiodic acid (HI) results in the cleavage of the O-methyl group of the anisole ring, leading to the formation of iodobenzene and acetophenone. The balanced equation for this reaction is C9H10O2 + HI → C6H5I + C8H8O.
So, the product of the reaction of 4-acetyl anisole with HI is a mixture of iodobenzene and acetophenone. The specific ratio of these products will depend on the reaction conditions, such as the temperature and concentration of the reactants.
It's worth noting that the reaction between 4-acetyl anisole and HI is an example of a nucleophilic aromatic substitution reaction, which involves the replacement of a leaving group (in this case, the O-methyl group) on an aromatic ring by a nucleophile (the iodide ion from HI).
Explain how the properties of ammonium lauryl sulfate make it useful for its intended purpose. Write a short paragraph.
Sodium lauryl sulfate is a surfactant that help with the mixing of oil and water to clean the skin and hair by helping water to mix with oil and dirt so that they can be rinsed away or suspend poorly soluble ingredients in water.
Why Ammonia lauryl sulfate serve as a surfactor ?They frequently serve as detergents, foaming agents, and other cleaning agents by assisting in the mixing of water with oil and dirt so that they can be rinsed away.It consist of long nonpolar hydrocarbon chains and the ionic sulfate end group which make it a surfactant.They lower the surface tension of the water so that air bubbles do not rupture when you brush your teeth or shampoo your hair.The 'lauryl sulphate' portion is the most important part of this molecule having one fatty acid end and one charged end, allowing it to function as an oil-water adaptor.Thus, ammonia lauryl sulfate serve as surfactore due to it's ability to lower the surface tension of water and ability to form micelles in water.
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If 335 g of water at 65.5 °C loses 9750 J of heat,
what is the final temperature of the water? Liquid
water has a specific heat of 4.18 J/(g*°C).
Answer:
We can use the formula for heat lost by a substance to calculate the final temperature:
Q = m * c * ΔT
where Q is the heat lost, m is the mass of the substance, c is the specific heat capacity of the substance, and ΔT is the change in temperature.
In this case, we know the values of Q, m, and c, and we need to find ΔT. Rearranging the formula, we have:
ΔT = Q / (m * c)
Substituting the given values, we get:
ΔT = 9750 J / (335 g * 4.18 J/(g*°C)) ≈ 6.9 °C
Therefore, the final temperature of the water is:
65.5 °C - 6.9 °C ≈ 58.6 °C
So the final temperature of the water is approximately 58.6 °C.
The final temperature of the water is approximately 58.5°C.
To find the final temperature of the water, we first need to understand that the heat lost by the water is calculated using the formula q = mcΔT, where 'q' is the Heat Transfer, 'm' is the mass of the water, 'c' is the specific heat of the water, and 'ΔT' is the change in temperature.
First, rearrange the formula to find ΔT = q/(mc).
Then, insert the given values (q = -9750 J, m = 335 g, c = 4.18 J/g°C).
The negative sign denotes heat loss.
You will find ΔT is approximately -7°C.
This is the amount the temperature decreases.
Subtract ΔT from the initial temperature of the water (65.5°C - 7°C), to get the final temperature of approximately 58.5°C.
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Which of the eight planets in the solar system has the most elliptical orbit? (10 points)
O Mars
O Earth
O Mercury
O Venus
Answer:
Mercury
Explanation:
Hope this Helps!
Mercury has the most elliptical orbit.
We have Solar System.
We have to find out which planet has the most elliptical orbit.
What is Ellipse ?An ellipse is the set of all points on a plane whose distance from two fixed points (called foci) add up to a constant.
According to the question -
Whether the ellipse will be more flattened or round it depends upon the eccentricity of the ellipse. The eccentricity of the ellipse is the ratio of distance between focal points and length of major axis. Mathematically-
\($e=\frac{c}{a}\)
Now - e is \(\alpha\) a (c = constant). Greater is the a, larger will be e and
0 < e < 1.
In the solar system mercury has the most elliptical orbit with the maximum eccentricity of 0.2056.
Hence, Mercury has the most elliptical orbit.
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A sample of air is held in a 722 ml. container at 23.3°C. This sample is transferred into a 481 mL container
with a measured pressure of 2.055 atm and a stable temperature of 80.1. What was the initial pressure
in the first container (in atm)?
01.38
0.978
01.24
O 1.15
Apply combine gas law
T1=296.3KT2=353KSo
\(\\ \rm\Rrightarrow \dfrac{P_1V_1}{T_1}=\dfrac{P_2V_2}{T_2}\)
\(\\ \rm\Rrightarrow \dfrac{P1(0.722)}{296.3}=\dfrac{0.481(2.055)}{353}\)
\(\\ \rm\Rrightarrow 0.0024P1=0.0028\)
\(\\ \rm\Rrightarrow P_1=1.167atm\)
D
Which compound contains ionic bonds?
A. HBr B. CO₂ C .C6H12O6 D. NaBr
Answer:
D
Explanation:
Transfer of electrons from Na to Cl
Na has configuration of 2,8,1 it will lose one electron to Cl with configuration of 2,7 inorder for both to attain an octet configuration
How many moles of CaSO4 are required to produce 128 g of SO2? 3CaSO4 + CaS → 4CaO + 4SO2
2 moles of CaSO4 are required to produce 128 g of SO2 in 3CaSO4 + CaS → 4CaO + 4SO2 in this equation.
What do you mean by mole ?The term mole is defined as a standard scientific unit for measuring large quantities of very small entities such as atoms, molecules, or other specified particles.
1 mole = 6.023 × 10²³ molecules
The balance equation is as follows:
3CaSO4 + CaS → 4CaO + 4SO2
1 mole = 6.023 × 10²³ molecules
1 mole SO₂ = 6.023 × 10²³ molecules
128 mole = ?
Molar mass of SO₂ = 64 gram
The numbers of moles in 128 gram SO₂ = 1 / 64 ×128
= 2 moles
Thus, 2 moles of CaSO4 are required to produce 128 g of SO2.
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the quantity PV/T must be held constant and both P and V are doubled, the value of T will necessarily have to,
What kind of intermolecular forces act between a xenon atom and a bromine molecule
Answer:
intermolecular forces of a tractione are a factor in how given molecules or compour will into act or be attracted to one onother
Explanation:
pa follow po
Which of the following statements represents an exact number? a4 dozen eggs were used to make a breakfast. bEarth orbits the sun every 365.2564 days. c0.41 g of oxygen was inhaled in each breath. d50,871 tickets were sold at a sporting event. e345.7 mL of water was used to make a birthday cake
Answer:
a. 4 dozen eggs were used to make a breakfast.
d. 50,871 tickets were sold at a sporting event.
Explanation:
An exact number is a value that is known with complete certainty. On the other hand, an inexact number is a value that has uncertainty.
You can imagine that an exact number is a number that you can obtain by 'counting'.
So based on this logic, the statements that represent exact numbers are the following:
a. 4 dozen eggs were used to make a breakfast.
d. 50,871 tickets were sold at a sporting event.
The axis of symmetry of a parabola is x = -2. It crosses the x axis at (-5,0). What is the coordinate of the other x-intercept?
The coordinate of the other x-intercept of a parabola with axis of symmetry x = -2 and crossing the x-axis at (-5,0) is (-1,0).
We know the vertex of the parabola in the example above is at the location (-2, y), where y is an integer. This is because the vertical line that passes through the vertex of a parabola is its axis of symmetry.
Since the parabola intersects the x-axis at (-5,0), we can infer that this location is a parabola's root. Given that the parabola is symmetric, a second root that is located at the same distance from the axis of symmetry must also exist.
The other root must be 3 units to the right of the axis of symmetry because the distance between the axis of symmetry and (-5,0) is 3 units to the left. The opposite x-intercept is therefore at (1, 0) or (-2 + 3, 0).
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Determine whether each statement describes a solution of a strong electrolyte, weak electrolyte, or non-electrolyte.
Has a medium level of conductivity Choose...
Contains a complete solute Choose...
Has little or no conductivity Choose...
Has the highest conductivity Choose...
Contains a completely dissociated solute Choose...
Contains a partially dissociated solute
Answer:
Please find the terms with their correct description in the explanation section.
Explanation:
An electrolyte is a substance that dissociates or ionizes into cations (positive charged ions) and anions (negative charged ions) in an aqueous solution. An electrolyte can either be strong or weak depending on how well it ionizes and its level of conductivity. However, a non-electrolyte neither ionizes in a solution nor conducts electricity.
Based on this;
1. Weak electrolyte: Has a medium level of conductivity i.e. partially conducts electricity
2. Strong electrolyte: Contains a complete solute
3. Non-electrolyte: Has little or no conductivity i.e. cannot conduct electricity because it doesn't dissociate into ions.
4. Strong electrolyte: Has the highest conductivity i.e. conducts electricity very well.
5. Strong electrolyte: Contains a completely dissociated solute i.e. the solute of the electrolyte separates into anions and cations completely.
6. Weak electrolyte: Contains a partially dissociated solute i.e. the ions of the solute do not ionize completely in the solution.
Weak electrolyte, strong electrolyte, non-electrolyte, strong electrolyte strong electrolyte and weak electrolyte are the answers of the each statement.
Has a medium level of conductivity means it conducts partially electricity not fully so we can say that it is a weak electrolyte. It also contains a partially dissociated solute i.e. the solute do not ionize completely into ions in the solution.
Contains a complete solute as well as has the highest conductivity means conducts electricity better refers to Strong electrolyte. It contains a completely dissociated solute i.e. the solute of the electrolyte separates into anions and cations completely so that's why it conducts electricity very well. Non-electrolyte has little or no conductivity means it cannot conduct electricity due to no dissociation into ions.
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What type of compound is Copper (1) phosphate ?
Answer:
Copper phosphide, Cu3P, also copper(I) phosphide, cuprous phosphide, cuprophosphorus and phosphor copper, is a compound of copper and phosphorus, a phosphide of copper.
Explanation:
20 Multiple Choice
5 cm
3 cm
20 cm
A woodworker begins carving on the following block of wood that weighs 2700 grams. What is the density of the wood?
0.11 cm
300
9 g/cm
27000
Answer:
9 g/cm
Explanation:
Density is the Mass over Volume you have the mass which is 2700 and now you need to find the volume which will be L x W x H which will be 5 x 3 x 20 which will equal 300
now apply the law 2700/300 = 9 g/cm is the density!
I hope that helps :)
Marvelous rides his bike with a constant speed of 6 miles per hour east. How long will he take to travel 21
miles?
- What is his velocity?
Answer:
It will take Marvelous 160 miles per hour east to travel 21 miles.
Explanation:
Because 21 times 6= 160 and make sure to add the per hour east because thats the velocity.
Potential in a different kind of cell.
A typical mammalian cell at 37
∘
C, with only potassium channels open, will have the following equilibrium:
K+ (intracellular) ⇌ K+ (extracellular),
with an intracellular concentration of 150 mM K+, and 4.0 mM K+ in the extracellular fluid.
What is the potential, in volts, across this cell membrane? Note: in this case, n = the charge on the ion, and Eo for a concentration cell = 0.00 V. explain please
The potential across this cell membrane with only potassium channels open is -0.082 V, which means that the inside of the cell is negatively charged relative to the outside.
The potential across a cell membrane can be calculated using the Nernst equation:
E = (RT/zF) ln([ion]out/[ion]in)
E = potential in volts, R= gas constant (8.314 J/mol*K), T= temperature in Kelvin, z = charge on the ion, F= Faraday constant (96,485 C/mol), and [ion]out and [ion]in are the concentrations of the ion outside and inside the cell, respectively.
K+ (intracellular) ⇌ K+ (extracellular)
The charge on potassium ions is +1, so z = 1.
The temperature is 37°C or 310 K.
The concentrations of potassium ions are [K+]in = 150 mM and [K+]out = 4.0 mM.
Substituting these values into the Nernst equation,
E = (RT/zF) ln([K+]out/[K+]in)
E = (8.314 J/mol.K × 310 K)/(1 × 96,485 C/mol) ln(4.0 mM/150 mM)
E = -0.082 V
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Why is light a wave?
Answer:
an electromagnetic wave
Explanation:
water is the working fluid in an ideal rankine cycle power plant. superheated vapor enters the turbine at 10 mpa, 4800c, and the condenser pressure is 6 kpa. the cooling water used in the power plant entered the condenser at 200c and exited at 350c. to gain understanding, we performed the following calculations: (a) work done by the turbine per kg of water (b) work consumed by the pump per kg of water (c) heat input in the steam generator per kg of water (d) heat rejected at the condenser per kg of water (e) the efficiency of the power plant (f) the mass flow rate of water in the cycle and the mass flow rate of cooling water assuming a 4000 mw power plant, i.e. similar to the palo verde nuclear power plant in arizona (g) how much is the mass flow rate of cooling water compared to the residential water use of a person in us (100 gallons of water per day
The calculations listed provide a comprehensive understanding of the thermodynamic performance of the Rankine cycle power plant and the water requirements of the plant.
This is a thermodynamics problem involving an ideal Rankine cycle power plant that uses water as its working fluid. The problem requires the calculation of various parameters, including the work done by the turbine, work consumed by the pump, heat input, heat rejected, efficiency, and mass flow rates of water and cooling water.
The problem also requires a comparison of the mass flow rate of cooling water to the residential water use of a person in the US. The solution to this problem involves applying the principles of thermodynamics, specifically the Rankine cycle, and using relevant equations to calculate the required parameters.
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