Fuel cell automobiles use hydrogen gas to electricity an electric powered motor. Unlike traditional automobiles which run on gas or diesel, gas cell motors and vehicles integrate hydrogen and oxygen to supply electricity, which runs a motor.
The gas cell electricity plants generate warmth and water as by-merchandise of electrical electricity generation. The extra warmth is directed to gas cell warmth exchangers, in which the extra warmth is rejected to Freon coolant loops. The water is directed to the potable water garage subsystem.
Liquid Hydrogen (LH2) Rocket Fuel.
The Saturn rockets used it for his or her secondary degree engines. Later the NASA area commute could use it to electricity its 3 most important rocket engines. Liquid hydrogen gas has many benefits, consisting of its low molecular weight and excessive power output whilst burned collectively with liquid oxygen.
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suppose your enzyme activity from last week was 139 umol/min/ml. you calculate that the sample has a protein concentration of 4.5 mg/ml. what is the specific activity of your sample?
The protein's specific volume (0.73 mL g-1 for -lactoglobulin).
Enzymes: What are they?Enzyme-containing proteins help speed up the metabolism, or chemical changes, in our bodies. While some compounds are decomposed, others have been produced. Everything that is alive contains enzymes. Naturally, our bodies produce enzymes.
What is an example of an enzyme?For instance, the enzyme pepsin is a vital component of gastric fluids and aids in the breakdown of food particles in the belly. Similar to how amylase, an enzyme found in saliva, turns starch into glucose to aid in the first stages of digestion. The thrombin enzymes is employed in medicine to speed up the healing of wounds.
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PLEASE HELP -- question in picture
The sequence of the decreasing the order of stability of the given compounds is :
BaCl₂ > CaCl₂ > MgCl₂ > AlCl₃ > HCl > AgCl
What is reactivity series?The reactivity series of metals or the activity series can be described as the arrangement of metals in the descending order of their reactivities.
The metals at the top of the activity series are powerful reducing agents and can be easily oxidized. These metals easily tarnish/corrode. The reducing ability grows weaker while moving down the series.
The electropositivity of the elements reduces as we move down the reactivity series of metals. All metals above hydrogen in the activity series liberate hydrogen gas upon reacting with dilute HCl.
As given the elements of the reactive metals form more stable compounds therefore, the metals like Ba, Ca, and Mg form more stable compounds than H or Ag.
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Answer:
pic attached
Explanation:
Two students are planning an investigation to determine which type of bond, ionic or covalent, is more polar. Which one of the tests would be relevant to their experiment?.
The property that will be least helpful in the determination of the bond type that has the strongest intermolecular forces is C. Conductivity in water.
It should be noted that the students wanted to investigate whether ionic or covalent bonds have stronger intermolecular forces.
In order to carry out the investigation, salt, sugar, and molar balls are used. Based on this, the property that is required for the investigation will be flammability, solubility in water, and the melting point.
The conductivity in water isn't required.
Which is NOT a form of thermal energy transfer?
O conduction
O convection
O spontaneity
O radiation
Answer:
C I think, haven't done this in awhile
Explanation:
I took science
What is the oxidation state for nitrogen
What type of particles are represented by the crosses(X)? Helpp please
Answer: The valence shell electrons are represented by crosses.
Explanation:
The outer shell of each atom is drawn as a circle. Electrons from one atom are shown as dots, and electrons from other atoms are shown as crosses. The circles overlap where covalent bonds are present.
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the enthalpy of solution is positive when ch3cn dissolves in formaldehyde. use this information to list the stages in order of increasing enthalpy.
The enthalpy of solution ∆H is positive when CH3CN dissolves in formaldehyde. Use this information to list the stages in order of increasing enthalpy A<D<B<C.
The net result of the energy absorbed or dissipated as heat by the solution when a given amount of solute is dissolved in a solvent at constant pressure. The amount of heat released or absorbed when a substance melts is not constant. It depends on the final solute concentration.
The enthalpy of a solution is expressed in kJ/mol at a nearly constant temperature. The energy change can be viewed as consisting of three parts endothermic bond breaking in the solute and solvent and the formation of an attractive force between the solute and solvent. The enthalpy of a solution describes the total amount of heat absorbed or released when two substances go into the solution. This sum can be either positive or negative.
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Choose the three factors that most significantly influence the properties of nanoscale materials.
a. bulk material properties.
b. elemental compostion.
c. size.
d. shape.
e. quantum mechanical effects
b. elemental composition d. shape and e. quantum mechanical effects three factors significantly influence the properties of nanoscale materials.
Nanoscale material are the set of substances that have least one Critical dimension less than 100 nanometer. That have magnetic, electrical and optical properties. S and P blocks are there in the nanoscale materials. Nanoscale materials are mostly concentrated in the s and p blocks Nano elements. Nanoscale material have have structure with dimensions at the nanoscale.so it has size of 1-100nm.The shape of the nanomaterials are in various shapes like rod shape spherical shape ,fibers and cups. In the nanoscales quantum effects dominates the electrical optical properties of the system. They create new opportunity for manipulating the response of the system.
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what is a frozen energy?
What mass of mgf2 is contained in 80. 85 g of a 22. 4% by mass solution of mgf2 in water?.
18.1 g is mass of mgf2 is contained in 80. 85 g of a 22. 4% by mass solution of mgf2 in water.
solution mass = 80.85 g
mass of solution percentage = 22.4%
% concentration = Mass of solute/Mass of solution × 100/1
22.4 = x/80.85 × 100/1
x = 22.4 × 80.85/100
x = 18.1 g
The quantity of substance that makes up an element's atom is known as its atomic mass. One-twelfth of the mass of the carbon-12 atom, with an assigned atomic mass of 12 units, is expressed as a multiple of 1.992646547 1023 gram, or in other words, 1.992646547 gram. One atomic mass unit is equivalent to 1.660539040 1024 grams on this scale (amu). The atomic mass unit is sometimes referred to as the dalton in honor of English scientist John Dalton (Da).
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When performing today’s experiment you leave the lid off your setup for the calibration. You remember that you left it off and decide to add it when determining the heat lost by the metal. When performing your calculations, you determine that your heat capacity values are off. Would your values be too high or too low?.
The heat capacity values obtained will be too low due to the heat lost.
What are the heat capacity values of substances?The heat capacity of a substance is the amount of heat required to raise the unit mass of that substance by one-degree celsius.
In order to determine the heat capacity of a substance, the method of calorimetry is used.
In the method of calorimetry, it is assumed that no heat is lost during the process.
The principle states that the heat lost is equal to the heat gained.
Hence, if heat is lost from the calorimeter during the process of determining the heat capacity of a substance, the heat capacity value will be lower than the actual values.
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what reaction conditions favor elimination in an acid-catalyzed dehydration? what reaction conditions favor elimination in an acid-catalyzed dehydration? the product is removed from the reaction mixture as it is formed the acid used has a strongly nucleophilic conjugate base low reaction temperature is used
Reaction conditions that favor elimination in an acid-catalyzed dehydration : product is removed from the reaction mixture when formed. For reaction to be completed, hypochlorous acid must be in excess during the reaction.
What is acid-catalyzed dehydration?Acid-catalyzed dehydration of alcohols takes place when an acid puts an extra hydrogen atom on the alcohol. This causes change in the OH alcohol group into an H2O or water group attached to the organic compound. When that particular molecule leaves then it leaves as water . Therefore dehydration occurs.
The activity of a solid acid on methanol dehydration reaction was found to be determined by the number of its acidic sites. The presence of such acid catalyst in the catalytic system shifts the methanol synthesis reaction, increasing the pass conversion of CO.
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Draw the structure of the major organic product formed in the reaction of 1−methylcyclohexene with bromine in water.
The major organic product formed in the reaction of 1−methylcyclohexene with bromine in water is attached as a picture.
A reaction mechanism is a representation of step by step transfer of electrons and molecules from one compound to another compound. In reaction mechanisms, the curved arrows show the moment of electrons.
In the reaction mechanism of 1-methyl cyclohexene the double bond of 1-methyl cyclohexene act as an attacking group and attacks Br2. As a result, one Br atom gets attached to 1-methyl cyclohexene. This results in a carbocation generation on the carbon having the methyl group. This carbon cation then attacks the oxygen of water molecules and the organic product (1S,2S)-2-bromo-1-methylcyclohexan-1-ol will generates as the major product.
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Please help! Its world science!
1. If you turn on the burner on a gas stove under a pan of cold water, energy moves from the burner to the pan of water. What is this type of energy transfer called?
2. If you burn wood in a fireplace, which type of energy resource are you using?
3. Which form of energy is an important factor in making electricity from water power?
4. What is a hydrocarbon?
5. What byproduct of nuclear energy has caused concerns about the use of this resource and why?
6. Which chemical element exposed in surface coal mining can cause environmental problems in nearby bodies of water?
7. What is the original source of most energy used on Earth?
8. When we burn a fuel, what is released that allows work to be done?
9. For biomass, solar, coal, natural gas, oil, and geothermal energy, identify each energy resource as renewable or non-renewable.
10. What factors are important in judging how helpful an energy resource is to us?
Energy as the ability to do work.
What is energy?
Energy has been defined as the ability to do work. Modern civilization is possible because people have learned how to change energy from one form to another and then use it to do work. People use energy to walk and for bicycle, to move cars along roads and boats through water, to cook food on stoves, to light our homes and offices, to manufacture products.
There are different forms of energy, which may include:
HeatLightMotionElectricalChemicalGravitationalMagneticThese forms of energy can be grouped into two general types;
Potential (stored energy)Kinetic (working energy)Explanations
1. This is called convection.
2. You are using chemical energy and converting it to thermal (heat) energy.
3. Kinetic energy is the important factor
4. A hydrocarbon is an organic compound consisting entirely of hydrogen and carbon. Hydrocarbons are generally colourless and hydrophobic, and their odors are usually weak or exemplified by the odors of gasoline. Examples of hydrocarbons are coal, petroleum, natural gas and tar. They are used as energy sources.
5. Radioactive waste. These materials can remain radioactive and dangerous to human health for thousands of years.
6. Mercury.
7. The energy of the sun is the original source of most energy used on Earth.
8. Heat is released and this heat expended allows work to be done.
9.
biomass - renewablesolar - renewablecoal - non-renewablenatural gas - non-renewableoil - non-renewablegeo-thermal energy - renewable10.
It produces a lot of heat per unit mass.It does a huge amount of work per unit mass.It is easily accessible.It is easy to store and transport.It is economical.It produces less amount of smoke.Learn more about energy:https://brainly.com/question/13881533
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How many moles are in 5.6 x 1023 particles of H2SO4?
0.93 moles are present in 5.6 x 1023 particles of H2SO4
number of moles= given particle/ Avogadro number
number of moles= 5.6 x 1023 particles/6.022×10^23
number of moles=0.93 mol
The mole idea is a useful way to indicate how much of a substance there is. Even one gram of a pure element is known to have an enormous number of atoms when working with particles at the atomic (or molecular) level. The mole idea is frequently applied in this situation. The unit of measurement that receives the most attention is the "mole," which is a count of a sizable number of particles.
Popularly known as the Avogadro constant, the quantity 6.02214076×10^23 is frequently represented by the letter "NA". Atoms, molecules, monoatomic and polyatomic ions, as well as other particles, are examples of the elementary entities that can be represented in moles (such as electrons).
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write the balanced molecular chemical equation for the reaction of solid copper with aqueous lead(ii) nitrate. if no reaction occurs, simply write only nr. (if there is a reaction, then copper is 2)
Balanced molecular chemical equation for the reaction of solid copper with aqueous lead(ii) nitrate is then there is no reaction so there is no copper
Chemical equation is a representation of a chemical reaction using symbols of the elements to indicate the amount of substance usually in moles of each reactant and product and solid copper with aqueous lead(ii) nitrate then there is no reaction between copper and lead nitrate solution and this is because copper is less reactive than lead
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block
wood with blac
4. Find the density of a piece of wood with a mass of 50.0 grams and a volume of 100. cm³.
=2g/cm3
Will it float on water?
The density of the wood will be 0.5g/cm³ . It will float in water because its density is than that of water i.e, 1g/cm³ .
Given that the mass of the substance is 50 g and its volume is 100cm³
So, its density will be given as,
Density= Mass/ Volume
=50/ 100 g/cm³
= 0.5 g/cm³
When placed in water, an object with a density greater than or less than that of water will float or sink, respectively. A substance's density is a defining characteristic that is independent of substance's volume.
The substance's density is less than that of water. Due to lower density than water, the substance will float on the surface of water.
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distillation is the separation of multiple
Distillation is the separation of multiple liquids. it means the selective boiling and subsequent condensation of a component in a liquid mixture.
Distillation It is a separate technique that can be used either to increase the concentration of a particular component in a mixture or to obtain pure components from a mixture.
The process of distillation takes advantage of the difference in boiling points of the components in a liquid mixture by converting one of them into a gaseous state. Distillation is not a chemical reaction but can be considered a physical separation process.
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in a williamson ether synthesis, you start by adding a base like methoxide to deprotonate a phenol so the deprotonated phenolate can act as a nucleophile. the moles of base should be
The moles of the base should be equal to the moles of phenol.
What is Williamson ether synthesis ?
An alkoxide ion acts as a nucleophile in the Williamson ether synthesis, an SN2 reaction in which an alkyl halide loses a halide ion to produce an ether. The reaction involves configuration inversion at chiral centers and may be constrained by potential competing elimination reactions.
What is nucleophile?
An atom or molecule that seeks the positive center of a chemical reaction, such as the atom's nucleus, is referred to as a nucleophile in chemistry because it has an electron pair that is available for bonding.
Therefore, the moles of base should be equal the mole of phenol.
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Look closely at the Sodium square below the table. Using the information in the square and the position of Sodium on the periodic table, describe sodium atoms with as much detail as you can. Below is a word bank. These are words that can help you with your description. You do not have to use all of them, but you should use some of them. DO NOT just define the words, use the words in your description. Make sure you are writing your OWN words. No copying and pasting. Word bank: protons, neutrons, electrons, atomic mass, atomic number, valence electrons, energy levels, group, period, metal, non-metal, metalloid
5- Charlotte throws 5 darts and they all end up in the outer ring of the dart board. Describe her:
Precision-ne Shot
Accuracy:
The Charlotte throws 5 darts and they all end up in the outer ring of the dart board is they are neither precise nor accurate.
Precise is defined as how close the measurement are with one another. Accuracy is defined as how the measurement is close to the correct value. if all the dart is close to each other but not on bullseye than it is high precise and low accurate. if the the dart are in the bullseyes and close to each other it is said to be high precise and high accurate.
Thus, The Charlotte throws 5 darts and they all end up in the outer ring of the dart board is they are neither precise nor accurate.
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Calcium carbonate is heated and decomposes to form calcium oxide (CaO) and carbon dioxide (CO2). Which statement is true about the difference between calcium carbonate and calcium oxide?
Calcium oxide has different physical and chemical properties as compared to calcium carbonate. Option 1.
Differences between calcium oxide and calcium carbonateCalcium carbonate and calcium oxide are unique from one another in terms of their physical and chemical properties, even though calcium oxide can be produced by the decomposition of calcium carbonate.
Both calcium carbonate and calcium oxide are only similar in terms of their color. They both appear white in color. Their differences include:
The chemical formula of calcium oxide is CaO while that of calcium carbonate is [tex]CaCO_3[/tex].Calcium oxide is able to react with water to form lime water, [tex]Ca(OH)_2[/tex]. Calcium carbonate, on the other hand, is insoluble in water.Both have different melting points.Calcium oxide cannot undergo a decomposition reaction, whereas, calcium carbonate can be decomposed further.Thus, both calcium carbonate and calcium oxide exhibit different chemical and physical properties.
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The complete question is as below:
Calcium carbonate is heated and decomposes to form calcium oxide (CaO) and carbon dioxide (CO2). Which statement is true about the difference between calcium carbonate and calcium oxide?
Calcium oxide has different physical properties and different chemical properties.Calcium oxide has the same physical properties and different chemical properties.Calcium oxide has the same physical properties and the same chemical properties.Calcium oxide has different physical properties and the same chemical properties.Enter the complete ionic equation to show the reaction of aqueous lead(ii) nitrate with aqueous potassium sulfate.
The full ionic equation for the conversion of aqueous lead (II) nitrate to solid lead (II) sulfate and aqueous potassium nitrate is as follows:
What is ionic equation ?PbSO4(s) + 2 K+ + 2 NO3 = Pb2+(aq) + 2 NO3(aq), 2 K+(aq), and SO42(aq) (aq)
Let's look at the molecular formula that results in solid lead (II) sulfate and aqueous potassium nitrate when aqueous lead (II) nitrate and aqueous potassium sulfate interact. This reaction involves two displacements.
PbSO4(s) + 2 KNO3 = Pb(NO3)2(aq) + K2SO4(aq) (aq)
All ions and molecular species are included in the full ionic equation.
PbSO4(s) + 2 K+ + 2 NO3 = Pb2+(aq) + 2 NO3(aq), 2 K+(aq), and SO42(aq) (aq)
The full ionic equation for the conversion of aqueous lead (II) nitrate to solid lead (II) sulfate and aqueous potassium nitrate is as follows:
PbSO4(s) + 2 K+ + 2 NO3 = Pb2+(aq) + 2 NO3(aq), 2 K+(aq), and SO42(aq) (aq)
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a series rc circuit has a resistance of 155 ohms and a capacitive reactance of 270 ohms. how many degrees is angle theta?
Angle theta = 〖60.11〗^0
Angle theta = 〖60.11〗^0
Resistance is a measure of an electrical circuit's resistance to current flow. Resistance is measured in ohms, which is represented by the Greek letter omega (Ω). When electrons move through a conductor, such as a metal wire, an electric current flows. Electrons in motion can collide with ions in the metal. This complicates the current flow and causes resistance.
Given resistance (R) = 155ohms
Capacitive reactance (Xc) = 270 ohms
We have to find angle theta = ?
Tan θ= capacitive reactance/resistance
Tan θ = Xc/R
Tan θ = 270/155
θ = 〖tan^(-1) (〗〖270/155〗)
θ = 〖tan^(-1) (〗1.74)
θ = 60.11
Therefore angle theta = 〖60.11〗^0
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which is not a way for carbon dioxide to reach the atmosphere
The process that is not a way for carbon dioxide to reach the atmosphere is Photosynthesis; option C
What is the carbon cycle?The carbon cycle is a biogeochemical cycle that describes the processes by which carbon is recycled between the living and non-living components of the environment.
The processes by which carbon is removed from the atmosphere and the processes by which carbon is returned to the atmosphere work together to ensure there is a balance of carbon in the environment.
The processes by which carbon is returned to the atmosphere in the form of carbon dioxide include the following:
respiration by living organismsburning of fossils fuelsdeath and decay of living organismsThe processes by which carbon is removed from the atmosphere include the following:
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Complete question:
Which of the following is not a way for carbon dioxide to reach the atmosphere?
a. forest fires
b. respiration
c. photosynthesis
d. burning of fossil fuels
How many valence electrons does C6H12O6 (glucose) have?
C₆H₁₂O₆ (glucose) has 72 valence electrons
Valence electrons are the electrons present in the outermost shell of any atom. So first we will find out the total number of atoms in glucose.
Total number of atoms in C₆H₁₂O₆ are:
Number of carbon = 6
Number of hydrogen = 12
Number of oxygen = 6
Now we will find out the total number of valence electrons in each type of atom:
Valence electrons in carbon = 4
Valence electrons in hydrogen = 1
Valence electrons in oxygen = 6
Calculate the total number of valence electrons in C₆H₁₂O₆ by multiplying the number of atoms with the number of valence electrons for each element. And then sum up all the valence electrons.
valence electrons in C₆H₁₂O₆ = (6*4) + (12*1) + (6 * 6)
valence electrons in C₆H₁₂O₆ = 24 + 12 + 36
valence electrons in C₆H₁₂O₆ = 72
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What is the mass of 3.5 moles of Fe2O3?
Answer: 3.5 miles Fe203 = 55.89078 grams
Explanation:
Decribe a method for making pure crytal of magneium chloride from magneium and dilute hydrochloric acid
A method for making pure crystal of magnesium chloride from magnesium and dilute hydrochloric acid can be done using filter paper.
How pure crystal of magnesium chloride can be obtained from magnesium and dilute hydrochloric acid ?For this method, use a filter paper and funnel.
As, magnesium chloride is in aqueous form, it will come out with the filtrate(solution).
take hydrochloric acid in beaker:
• Keep adding small pieces of magnesium ribbon, until magnesium is in excess
• filter using filter paper and funnel and filter excess magnesium
• pour the solution into evaporating basin
• and then heat using Bunsen burner
• leave it to crystallize
evaporate or boil off the water
• then decant solution
• finally pat dry using filter paper.
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What happens to the atoms of sugar as it dissolves and then hardens to form rock candy?
An electric drill pulls 1000 joules per second or electrical energy from
the wall. The drill bit only exerts 555 joules of energy on the wood it's
drilling through. Where did all the extra energy go?
All of the energy stored or applied on a body cannot be converted tono work done only the available form of energy is converted to work. The remaining part is called unavailable energy which is stored on the body or taken as increase in entropy.
What is unavailable energy?According to thermodynamic concepts, the not all the energy can be converted into useful work .Or in other words only available energy can be converted to work. This available form of energy is called Gibbs energy.
For instance if we take a heat engine, the heat from the hot body is not completely transferred into colder body. According to third law of thermodynamics, this unavailable work is being considered as gone for increase in entropy.
Therefore, only available energy of the electric drill can be changed to work done and that is 222 J out of 1000 J, remaining goes for an increase in entropy of the system.
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