The mass of methane (CH₄) which must be burned in order to liberate 12,880 kJ of heat is 231.9 g
A combustion reaction is a reaction in which a substance reacts with the oxygen and releases the energy in the form of light and heat.
Given data :
Heat energy liberated = 12,800 kJ
Δ Combustion = 891 kJ/mol
To calculate the mass of methane (CH₄) -
Number of moles of methane burned = Heat energy used
Δ Combustion
Number of moles of methane burned = 12880
891
Number of moles of methane burned = 14.455 mol
Since, Molar mass of methane is 16.043 g/mol
So, Mass of methane = Number of moles of x Molar mass of methane
methane burned
Mass of methane = 14.455 mol x 16.043 g/mol
Mass of methane = 231.9 g
Therefore, the mass of methane which must be burned is 231.9 g.
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Please Help Quick ASAP Hurry
Refer to your periodic table. The orbital notation for Aluminum in the outer most shell would have how many electrons in the S orbital, and how many in the p orbital?
1 electron in the s orbital, and none in the p.
2 electrons in the s orbital. None in the p orbital
2 electrons in the s orbital and 1 in the p orbital
In the outermost shell of aluminum, there are 2 electrons in the s orbital and 1 in the p orbital.
What is the orbital diagram?Let us recall that the orbital diagram is the diagram that shows the arrangement of the electrons in an atom. Let us recall that aluminum is an element of group 13 of the periodic table. This implies that there are three electrons in the outermost shell of the atom.
Now, we can see the orbital diagram of aluminum in the image that have been attached to this answer. It is therefore very much clear that there are three electrons in the outermost shell.
In the outermost shell of aluminum, there are 2 electrons in the s orbital and 1 in the p orbital.
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Use the graph to determine the velocity between 6 and
12 seconds.
What was the velocity over the entire trip?
(there was no science option or there probably was but im slow, so i put chemistry)
-2 and 0 was the velocity over the entire trip
What is the distinction between velocity, acceleration, and speed?An object's velocity, which encompasses both its speed and direction of motion, is equal to the rate at which its location changes. The acceleration is determined by how quickly an object's velocity changes.
Similar to how distance and displacement are connected, speed and velocity are also related. Velocity is a vector, whereas speed is a scalar. The letters v (italic) stand for velocity and v for speed (boldface). A bar appears over the symbol for average values.
A train travelling at an average speed of 50 km/h in the south will go north at a speed of 50 km/h.
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name some of the materials used to build the tabernacle. use complete sentences and include at least three specific materials that were used by the builders.
The answer would be Porpoise Skin, Acacia wood, gold, silver and bronze.
Some of the materials that are used to build the tabernacle. The three specific materials that were used by the builders are mentioned below :
Porpoise Skin, Acacia wood, gold, silver and bronze
Porpoise skins to make the covering of sanctuary as well as the container. Acacia wood also called as mimosa. It is excellent quality of wood. The durability of wood is extremely good. Gold is a chemical element with the symbol Au and Z is 79. This makes it one of advanced that rudiments naturally. It's a bright orange-unheroic, thick, soft, malleable, and ductile essence in pure form.
Tabernacle is related to exodus God, it is basically a residence of God.
It is also used for astrological purpose and healing motives.
High resistance fungus.
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how does the trend ionization energy affect the reactivity of group 1 element
Answer:
Alkali Metals are the name given to Group 1 elements. They are known as s-block elements because the s subshell is home to their highest energy electrons. As one moves along group 1, the atomic radius grows as a result of each element's additional electron shell. The initial ionization energy drops as you move along the group.
Explanation:
hope this helps
The separation of the components of a mixture is based upon the fact that each component has different.
The separation of the components of a mixture based upon the fact that each component has different set of physical and chemical properties.
These components are pure substances which can either be elements or the compounds. There are various factors for the separation of the components. These factors are state, melting and boiling point, solubility, magnetic nature etc.
Techniques such as chromatography, distillation, evaporation, and filtration are used for mixtures that can be separated through physical changes.
Physical changes do not affect or change the nature of the substance. It simply changes the form. Through chemical changes pure substances, such as compounds, can be separated.
Physical properties of the component can be physical state, magnetic and electrical properties, specific gravity, density, melting point, boiling point and solubility, etc.
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A package of chocolate instant pudding contains 2840 mg of sodium how many grams of sodium are in it
2.48 g of sodium are in it
Chemical element of the alkali metal group Group 1 A of the periodic table and sodium is a very soft silvery-white metal and sodium is the most common alkali metal and the sixth most abundant element on Earth
Here given data is package of chocolate instant pudding = 2840 mg of sodium then in order to determine the amount of sodium in grams, we will follow the unit conversion method which is given below so, thus, the amount of sodium present in the chocolate instant pudding in grams is 2.48g
2840mg→g
1000mg/g = 2.48g sodium are in it
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The fastest animal in the world is the peregrine falcon. it is capable of diving after its prey at an amazing 83.00 meters per second. how fast this is the penguin going in miles per hour?
speed conversion tiles
a. 128.0 miles/hour
b. 185.7 miles/hour
c. 298.8 miles/hour
d. 371.1 miles/hour
298.8 miles/hour is the penguin going in miles per hour.
What is the fastest peregrine falcon diving speed ever recorded?The peregrine falcon is the world's fastest diving bird and the fastest animal. According to Guinness World Records, one was recorded travelling at more than 380 km/h while stooping - diving after prey - in 2005.It’s given that a peregrine falcon’s maximum speed while diving is 200 miles per hour and that 1 mile = 5280 feet. Therefore, a peregrine falcon’s maximum speed while diving is (200 miles/1 hour)(5280 feet/1 mile)=1,056,000 feet per hour.There are 60 minutes in 1 hour and 60 seconds in each minute, so there are (60)(60) = 3600 seconds in 1 hour. A peregrine falcon’s maximum speed while diving is therefore (1,056,000 feet/1 hour)(1 hour/3600 seconds) ,
which is approximately 293.33 feet per second. To the nearest whole number, this is 293 feet per second.
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a polymer mixture p has number-average and weight-average molecular weights of 120,000 and 300,000 respectively and was divided into fractions a and b by fractional precipitation.
A polymer mixture p that has number-average and weight-average molecular weights of 120,000 and 300,000 and then Number average molecular weight is 110,000 g/mol
a) The number average molecular weight (NAM) is calculate using the mole numbers of each component. In this case, we will multiple each component molecular weight by the number of moles of each one. After that we will sum them and finally to divide by the total number of moles.
NAM = (Na*MA + Nb*MB)/(Nt)
NAM = (1 mol *120000 g/mol + 1*100000 g/mol ) /(2 mol)
NAM = 110000 g/mol
The number average molecular weight for the polymer P is 110,000 g/mol
We have a polymer P made up of two monodisperse fractions.
A with molecular weight of MA = 120000 g/mol and B with MB =100000 g/mol.
The batch contains an equal mole fraction of each component A and B.
Let's suppose a total number (Nt) of mols 2 moles. Equal fraction means XA = 0.5 and XB =0.5
Nt = 2 mol
Na = 2*0.5 = 1 mol
Nb = 2*0.5 = 1 mol.
So, we have 1 mol of A, 1 mol of B and 2 moles in total.
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in the lab, we used two solvents, one for the extraction and one for the recrystallization. what solvent did we use for the extraction, and which for the recrystallization? what solvent is trimyristin more soluble in, and why?
A non-volatile solvent should be used that is present without impurities.
How should a solvent be selected for recrystallization?The solvent should be non-volatile, non-flammable, and non-carcinogenic. 50 to 120°C should be the boiling point of the solvent. Impurities ought to be soluble in the cold solvent or insoluble in the hot solvent, respectively. The substance and solvent must not interact in any way.
Which solvent is more soluble for trimyristin, and why?Ether has a higher solubility for trimyristin than acetone. After the solvent was removed, diethyl ether produced an oil that was difficult to crystallize.
Longer fatty acid chains result in more London dispersion forces, which raise the melting point.
What types of solvents are commonly used to dissolve crystals?Several of the major laboratory solvents, including water, alcohol is commonly used.
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how does the volume of the gas change when the pressure increased
Answer:
When pressure increases, gas volume decreases.
When pressure decreases, gas volume increases.
how are the atoms of different elements different?
Any atom can differ in the amount of any of the three particles in each of them.
If the number of protons is different, the atoms are of two different elements. The number of neutrons in atoms of different elements can be the same and the number of neutrons in two atoms of the same element can be different.
The number of protons in the atoms of each element is fixed to its atomic number. The atomic mass can be the same across atoms of different elements but the atomic number is the same. It is therefore accurate to say that atoms of different elements can be identified solely by the number of protons.
The density of ethyl alcohol is 0.79 g/mL. What is the mass of 150 mL of ethyl alcohol?
Answer:
118.5 grams
Explanation:
150*0.79 because there are 0.79 grams in a milliliter and we need to find out how many are in 150 milliliters
In the carbon cycle, carbon is found in __________.
A)
the atmosphere
B)
the soil
C)
living organisms
D)
all of the above
Answer:
The answer is D all of the above
Explanation:
Most carbon is stored in rocks and sediments, while the rest is stored in the ocean, atmosphere, and living organisms.
Answer:
D
Explanation:
Bro the source is: Trust me Bro
all but one of the conditions will cause equilibrium to shift right and produce more of the products. which change will cause the reaction to shift to the left?
The equilibrium to shift as in direction where the drop in concentration of occurs if the concentration of [tex]Co_{2}[/tex]is raised on the product side. As a result, the equilibrium will move to the left.
what is equilibrium?
During a reversible chemical process, chemical equilibrium is the state in which there is no net change in the quantity of reactants or products. The moment the products are produced in a reversible chemical reaction, they begin to interact with the initial reactants.
When the two opposing reactions are in equilibrium, there is no net change in the amount of the chemicals involved since they are taking place at the same rates, or velocities.
However at time, the reaction may be deemed to have finished, meaning that the maximum amount of reactants to products has been converted under the given reaction conditions.
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The correct question is :
Consider the following reversible, exothermic chemical reaction: 2C2H2(g) + 5O2(g) ↔4CO2(g) + 2H2O(g)
All BUT one of the conditions will cause equilibrium to shift right and produce more of the products. Which change will cause the reaction to shift to the left?
A) adding oxygen
B) adding CO2
C) increasing the pressure
D) decreasing the temperature
How might waves relate to energy?
Waves are related to energy because waves carries energy.
What is energy?Energy is defined as a quantitative property that is transferred to a body or to a physical system to perform there work.
It can also be defined as a ability to do work or ability to exert a force causing displacement of the objects.
Energy is divided into two parts.
Potential energy - It is defined as a stored energy that depend upon the relative position of various part of the system.Kinetic energy - It is defined as the energy of an object that has its motion.The amount of energy carried is related to there frequency and there amplitude. The wave travels and carry energy with it.
Thus, waves are related to energy because waves carries energy.
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Calcium has a density of 2.72 g/ml. What is the mass of 24.9 ml of calcium?
.115km=_______cm
Please I need help!
115 Kilometers is an equivalent of 11,500,000 centimeters. This problem is related to metric conversion.
What is the explanation for the above answer?It is to be noted that there are 100,000 centimeters in one Kilometer.
Hence,
115 Kilometers = 100,000 x 115
= 11,500,000
Thus, 115 Kilometers = 11,500,000 Centimeters.
The metric system is an international decimal weights and measures system that relies on the meter for length and the kilogram for mass that was introduced in France in 1795 and is now officially used in virtually all countries.
The metric system is a measuring system that employs the meter, liter, and gram as basic units of length (distance), capacity (volume), and weight (mass). We employ units derived from metric units to measure smaller and greater quantities.
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what modifications to a fractional distillation setup can be made in order to increase the speed or efficiency of the separation? select one or more: place the sample flask and fractionating column in an ice bath. wrap aluminum foil around the sample flask and fractionating column. place the receiving flask in an ice bath. wrap aluminum foil around the receiving flask.
You can modify to wrap aluminum foil around the sample flask and fractionating column.
And place the receiving flask in an ice bath.
What is fractional distillation?Separating a mixture into its constituent parts, or fractions is known as fractional distillation. By heating chemical mixtures to a temperature where one or more fractions of the mixture evaporate, chemical compounds are separated.
Fractional Distillation can also be described as the separation of a liquid combination via distillation, usually using a fractionating column, into fractions with different boiling points (and thus chemical composition).
Chemicals can be cleaned by fractional distillation, and mixtures can be divided into their constituent parts.
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true or false? solvents that are not in use should be capped and stored in the fume hood
If 5.47 moles of gas are produced in an experiment and it is measured that they occupy 112 l at stp, what is the experimental molar volume of the gas?
The molar volume of gas is 20.48 liter/mol.
We need to know about molar volume to solve this problem. The molar volume is defined as how much volume is in one mole of the substance. It can be calculated by this equation
Vm = V / n
where Vm is molar volume, V is the volume of the substance and n is the total amount of substance in moles.
From the question above, the given parameters are
n = 5.47 moles
V = 112 L
By substituting the given parameter, we can calculate the molar volume
Vm = V / n
Vm = 112 / 5.47
Vm = 20.48 L/mol
Hence, the molar volume of gas is 20.48 liter/mol.
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What is the composition of the nucleus of 26Mg?
They only differ in that a 24Mg atom has 12, a 25Mg atom has 13, and a 26Mg atom has 14 neutrons in its nucleus.
What are neutrons?Neutrons are defined as a proton-sized subatomic particle with no electric charge that is present in all atomic nuclei with the exception of those of regular hydrogen. Hydrogen is the sole exception, as it has a single proton in its nucleus. Compared to positively charged protons, neutrons have a little higher mass and a neutral electric charge.
Magnesium (Mg). Diagram of the magnesium-24 atom, the most prevalent isotope of this element, showing its nuclear structure and electron configuration. 12 protons (red) and 12 neutrons make up the nucleus (blue). When neutral, magnesium-26 contains 12 protons and 12 electrons.
Thus, they only differ in that a 24Mg atom has 12, a 25Mg atom has 13, and a 26Mg atom has 14 neutrons in its nucleus.
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(b) Figure 1 shows the melting points and the boiling points of four substances, A, B, C and D.
Figure 1
Temperature
in °C
250
200
150-
100
50
0-
<-50
-100
<-150
-200
-250
*
A
B
*
C
Substance
-X
D
Which substance is liquid over the greatest temperature range?
E
Key
x Melting
point
. Boiling
point
Figure 1 shows the melting points and the boiling points of four substances, A, B, C and D. The substance is liquid over the greatest temperature range is C.
Hence, Option 3 is correct answer.
What is Melting Point ?The Melting point (MP) of a substance is defined as the temperature at which a solid melts and change from a solid state to a liquid state may coexist in equilibrium. Melting point is a physical property.
Example of melting point: Sodium chloride (NaCl) is an ionic compound. Sodium chloride (NaCl) is made up of strong ionic bonds and it melts at only high temperatures that is 801°C.
What is Boiling Point ?Boiling point is defined as the particular temperature where the liquid-gas phase change occurs and the vapor pressure of a liquid equals the external pressure surrounding the liquid.
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Note: The question is incomplete on the portal. Here is the complete question.
Question: Figure 1 shows the melting points and the boiling points of four substances, A, B, C and D. Which substance is liquid over the greatest temperature range ?
1. A
2. B
3. C
4. D
Why is an acid able to produce ions in aqueous solution? assume that the general formula of an acid is given by ha, where a is usually a halogen or oxygen atom.
An acid is able to produce ions in the aqueous solution because polar H-A bond break due to the attraction between H atoms and the O atoms of water.
In Chemistry, a substance that produces hydrogen ions along with a conjugate base is called acid.
After dissolving in water, the constituents of acid break apart forming hydrogen ions or H+ ions which react with water molecules to form hydronium ions i.e. H3O+. Thus making the solution more acidic.
The general formula of an acid shows that it contains a halogen atom, an oxygen atom and hydrogen atoms.
For example, the dissociation of H2SO4 in water produces H+ ions and SO4- ions.
H2SO4 ⇄ H+ + SO4-
In the absence of water acids can not dissociate.
To put it simply, acids release h+ ions only when they are added to an aqueous solution.
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PLEASE HELP IVE BEEN STUCK ON THESE KINDA OF PROBLEMS FOR HOURS
The frequency of the wave is 1.33 * 10^15 Hz.
What is the frequency?We know that a wave has both the magnitude and the direction of the wave. In this case, we can see that the electron is said to have the speed of light and we need to find the frequency of the electron.
From the wave formula;
c = λf
c = speed of light
λ = wavelength
f = frequency
c = 3 * 10^8 m/s
λ = 225 * 10^-9 m
f = ???
f = c/ λ
f = 3 * 10^8 m/s/225 * 10^-9 m
f = 1.33 * 10^15 Hz
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Water molecules that surround a less polar molecule in solution are ________.
a. mobile and ordered
b. immobile and disordered
c. mobile and disordered
d. immobile and ordered
Water molecules that surround a less polar molecule in solution are immobile and ordered.
Water is good at dissolving ions and polar molecules, but it is poor at dissolving non-polar molecules. Water makes an excellent solvent because of its polarity and ability to form the hydrogen ions.
Polar molecules have the electric charges which are unequally distributed. Water forms the electrostatic interactions which are charge-based attractions with the other polar molecules and ions, due to its polarity.
Hydrogen carries a partial positive charge and oxygen with partial negative charge. Oxygen having partial negative charge and hydrogen having partial positive charge results in the polarity of the molecule.
The less polar molecules and ions interact with the water, the partially positive and partially negative ends of water. The positive charges attracts negative charges, thus leading it to be immobile and ordered.
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Be sure to answer all parts. Recall that there is restricted rotation around carbon-carbon double bonds. Maleic acid and fumaric acid are two isomers with vastly different physical properties and pka values for loss of both protons. Explain why each of these differences occurs
Differences in the melting point and pKa values between the maleic (Z- or cis-isomer) and fumaric (E- or trans-isomer) acid stem from differing in the orientation of carboxylic groups around the double bond.
Fumaric acid has a much higher melting point (287 degrees Celsius) than maleic acid (135 degrees Celsius). This is because maleic acid forms an intramolecular H-bond between the two carboxylic groups (due to their proximity to one another), which means that it cannot form such a bond with other molecules, weakening the intermolecular interactions and lowering the melting point.
Fumaric acid has pKa values of 3.03 and 4.44, while the values for maleic acid are 1.9 and 6.07. This means that the maleic acid will much more easily lose the first proton, but then lose the other one with more difficulty. This is again due to the proximity of the two carboxylic groups. The first proton is easily lost because upon its leave, the remaining one is bound through an additional H-bond to the other carboxylic group, making it more difficult to remove.
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If there are 2.54 cm in an inch,how many inches are in 225 cm?
Answer:
88.58 inches
Explanation:
You would just divide 225 by 2.54
Answer:
88.5827
Explanation:
A gas occupies 1.56 L at 101.3kpa. What will be the volume of this gas if the pressure becomes
45.5kpa?
The volume of a gas that initial occupies 1.56 L at 101.3 KPa is 3.47L.
How to calculate volume of a gas?The volume of a gas at a given pressure can be calculated using Boyle's law equation as follows:
P1V1 = P2V2
Where;
P1 = initial pressureV1 = initial volumeP2 = final pressureV2 = final volumeAccording to this question, a gas occupies 1.56 L at 101.3 kpa, the volume of this gas if the pressure becomes 45.5kpa can be calculated as follows:
101.3 × 1.56 = 45.5 × V2
158.028 = 45.5V2
V2 = 3.47L
Therefore, the volume of a gas that initial occupies 1.56 L at 101.3 KPa is 3.47L.
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a monolayer containing 3.18×10-6 g of oleic acid has an area of 20.0 cm2. the density of oleic acid is 0.895 g / ml. what is the thickness of the monolayer (the length of an oleic acid molecule)? 5.69×10-5 cm 1.42×10-7 cm 7.11×10-5 cm 5.63×10-6 cm 1.78×10-7 cm
A monolayer is containing 3.18×10-6 g of oleic acid has an area of 20.0 cm2, thus the thickness of the monolayer is calculated as 1.777 × 10⁻⁷ cm
Thickness of MonolayerUsing,
Density = Mass / Volume
It is given that:
Area = 20.0 cm²
Density = 0.895 g/mL
Mass = 3.18 × 10⁻⁶ g
Then, applying the density formula as:
0.895 g/mL = 3.18 × 10⁻⁶ g / Volume (ml)
Volume = 3.55 × 10⁻⁶ mL
Since, 1 mL = cm³
So, Volume = 3.55 × 10⁻⁶ cm³
Thickness of monolayer = ?
Also, Volume = area x thickness
So, then we have
Thickness = Volume/Area = 3.55 × 10⁻⁶ cm³ / 20.0 cm²
= 1.777 × 10⁻⁷ cm
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A steel ball is at one end of a box that is moving forward as shown. The box suddenly stops. According to Newton's first law, what happens to the steel ball just after the box stops?
Because of friction, the ball continues rolling forward at the same speed.
Because of friction, the ball rolls forward at an increased speed.
Because of inertia, the ball continues rolling forward at the same speed
Because of inertia, the ball rolls forward at an increased speed.
C. Because of inertia, the ball continues rolling forward at the same speed.
What is Newton's first law of motion?
Newton's first law states that if a body is at rest or moving at a constant speed in a straight line, it will remain at rest or keep moving in a straight line at constant speed unless it is acted upon by a force.
This law of is also called the law of inertia because it depends on the mass of the object.
If a steel ball is at one end of a box that is moving forward, when the box suddenly stops, the steel ball will continue moving forward based on Newton's law of inertia.
Thus, because of inertia, the ball continues rolling forward at the same speed.
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