In general, the formation of a chemical bond lowers the potential energy of a chemical system, leading to a more stable arrangement.
What is potential energy?Stored energy depends upon the relative position of various parts of a system.
In bond formation, atoms lose their potential energy to attain stability and heat is evolved. The bond formation is an exothermic reaction.
Atoms bond together to form compounds to attain lower energies than they possess as individual atoms.
A quantity of energy is equal to the difference between the energies of the bonded atoms and the energies of the broken atoms.
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Which of the following materials fall in the category of a ‘‘pure substance’’?
Ice, Milk, Iron, Hydrochloric acid, Calcium oxide, Mercury, brick, wood, Air
Answer:
1) Ice, iron, calcium oxide and mercury are pure substances since they contain particles of only one kind of matter.
2) In contrast, milk, hydrochloric acid (hydrogen chloride gas dissolved in water), brick and air cannot be called pure substances because they consists of particles of more than one kind of matter.
Somebody please help meeeeeeeeee!! (The question is underneath the table)
Answer:
1.)
Parent 1:
Ff (genotype) and free earlobes (phenotype)
Parent 2:
ff (genotype) and attached earlobes (phenotype)
2.)
Ff and ff (possible genotypes)
Free earlobes and attached earlobes (possible phenotypes)
Explanation:
Phenotypes are the observable traits an organism displays.
Genotypes are the genetic sequences organisms' possess that code for particular traits.
I am assuming that heterozygous individuals (Ff) display the dominant trait (free earlobes). As such, one parent has the Ff genotype and the free earlobe phenotype. The other parent has the recessive genotype (ff) and phenotype (attached earlobe).
50% of the children will have the same genotype and phenotype of one parent and the other 50% will have the same genotype and phenotype as the other parent.
None of the children will have the completely dominant genotype (FF).
how many principal energy levels are there
Answer:
There is an infinite number of Principal Energy Levels, see the answer for a full explanation
Explanation:
As stated above There is an Infinite number of principal energy levels, yet there are 4 main principles for principal energy; energy levels, sublevel, orbitals, and a number of electrons per sublevel.
9. (05.06 mc)
during an experiment, the percent yield of calcium chloride from a reaction was 80.34%. theoretically, the expected amount should have been 115 grams. what was the actual yield
from this reaction?
caco, + hc - cacl + co, + h20 (5 points)
a. 090.1 grams
b. 92.4 grams
c. 109.2 grams
d. 115.3 grams
The actual yield of the experiment given the data from the question is 92.4 g (Option B)
What is percentage yield?This is the ratio of the actual yield to the theoretical yield of a given reaction multiplied by 100
Percentage yield = (Actual / Theoretical) × 100
What is actual yield?This is the amount obtained from the expriment procedures
What is theoretical yield?This is the amount obtained from simple calculations as regarding the experiment.
How to determine the actual yieldPercentage yield = 80.34%Theoretical yield = 115 gActual yield =?Actual yield = percentage yield × theoretical yield
Actual yield = 80.34% × 115
Actual yield = 0.8034 × 115
Actual yield = 92.4 g
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The diagram below shows three kettles with their powers and the time they take to boil 500cm3 of water. How much energy is transferred (in kilojoules, kJ) by the 1.4kW kettle while it boils the water?
The energy transferred is given as the product of power and time. The 1.4 kW kettle with boiled water produces 378 kJ of energy.
What is energy?Energy is the quantitative property that determines the work done by the body in the form of heat and light.
The image showing the kettles with time and power is attached below.
Given,
Power of the kettle = 1.4 kW
Time taken = 4.5 minutes
If power = energy ÷ time
Then, energy = power × time
= 1.4 × 0.075
= 0.105 KWh
Therefore, 0.105 kWh or 378KJ is the energy transferred.
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PLEASE I REALLY NEED HELP!!! ITS NOT MULTIPLE CHOICE BTW :'(
A 76.0-gram piece of metal at 96.0 °C is placed in 120.0 g of water in a calorimeter at 24.5 °C. The final temperature in the calorimeter is 31.0 °C. Determine the specific heat of the metal. Show your work by listing various steps and explain how the law of conservation of energy applies to this situation.
Answer:
660J/kg.°C
Explanation:
Using the fact that
∆E of metal + ∆E of water = 0
∆E of the metal = Q = m*c*(T2-T1)
Where
Q = heat lost or gained = ?
m = mass of metal in kg = 0.076kg
c = specific heat of the metal = ?
T1 = 96°C
T2=31°C
∆E of the water=Q= m*c*(T2-T1)
Where
Q = 0.120*4180*6.5 = 3260J
Therefore
3,260J + Q of the metal =0
3,260J + 0.076*C*(31.0–96.0)=0
3,260J - 4.94c = 0
3,260 = 4.94c
3,260/4.94 = c
660J/kg.°C = specific heat of the metal
hope this helps:)
Compare the properties of the four states of matter in terms of particle arrangement, particle motion, shape, size, and compressibility.
Particle arrangement, shape, and size of the four states of matter generally decreases from solids to plasma, whereas particle motion and compressibility increases from solids to plasma.
What are the four states of matter?The four states of matter are:
solidliquidgasplasmaComparison of the properties of the four states of matter in terms of particle arrangement, particle motion, shape, size, and compressibility can be summarized as follows:
particle arrangement - orderliness decreases from solids to plasma particle motion - increases from solids to plasmashape - solids have definite shapes, whereas liquids, gases and plasma have no definite shapesize - solids have the largest size while plasma have the smallest sizecompressibility - solids are least compressible while plasma is most compressibleTherefore, the particle arrangement, shape, and size of the four states of matter generally decreases from solids to plasma, whereas particle motion and compressibility increases from solids to plasma.
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moles
5.
A mixture of gases at a total pressure of 105 kPa contains N2, CO2, and O2. The partial pressure of the O2 is 21 kPa and the
partial pressure of the N₂ is 81 kPa. What is the partial pressure of the CO₂? (3 pts)
Answer:
the daddy and Video Bhai have a
Explanation:
for and or for the if or as or as there have no a of option to go with you 6th and I would love from you to help out in any event that I am from the only reason you would be so close and to me million times is the fact I am from the the only reason you have to do it the way I want it is the best way for us and we are not me million people that are not got to me it's not like they were in a bad place and they didn't want me million other people in my world who made me think about you are
If you run this reaction with 15 g of CuCl2 and 20 g NaNO3, what is the theoretical yield of NaCl?
The theoretical yield of a substance is the amount of the mass that is calculated from stoichiometry. The mass of sodium chloride produced is 13.03 gms.
What is mass?
Mass of the substance is a multiplication of the molar mass and moles.
The balanced reaction is given as:
CuCl₂ + 2NaNO₃ ⇒ 2NaCl + Cu(NO₃)₂
Moles of copper chloride are calculated as: 15 ÷ 134.45 = 0.115 moles
Moles of sodium nitrate are calculated as: 20 ÷ 84.99 = 0.2353 moles
From the reaction, 1 mole of copper chloride gives 2 moles of sodium chloride so, 0.115 moles of copper chloride will produce 0.223 moles.
Similarly, 2 moles of sodium nitrate produce 2 moles of sodium chloride so, 0.2353 moles produce 0.4706 moles.
From this, it can be concluded that copper chloride is a limiting reagent and will be used to calculate the mass of NaCl.
Mass of NaCl is calculated as: Mass = 0.223 moles × 58.44 = 13.03 gms.
Therefore, 13.03 gms is the theoretical yield of sodium chloride.
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When an automobile engine burns gasoline, what are the energy conversions? (Hint: there are three.)
Answer:
The release of energy from fuels is used to make other forms of
energy. When gasoline burns in a car engine, some of the
chemical energy in the gasoline is converted into heat. The heat
is converted into mechanical energy. The mechanical energy
moves the car .
if you know that I am right please mark it as brainliest
Answer:
It is asking for 3 energy conversions like Mechanical energy is one of them
Explanation:
please ill mark u brilliant
+ 10 points
The conductance of the electric current through the electrolytic solution increases with
a)decrease in dilution
b)increase in dilution
c)increase in concentration
d)low degree of ionization
The conductance of the electric current through the electrolytic solution increases with increase in concentration.
What is electrolytic solution?
Electrolytic solutions are solutions that are capable of conducting an electric current due to presence of ions.
The current flowing in an Electrolytic solutions is calculated as;
Q = It
I = Q/t
where;
Q is chargesIncrease in the concentration of the charges, increases the amount of charges in the solution and hence the conductance of the solutions will increase as well.
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A balloon containing 0.500 mol ar at 0.00°c and 65.0 kpa pressure is expanded by adding more argon. formula: pv = nrt (r = 8.317 l•kpa/mol•k) what is the original volume of the gas? l
The original volume of the gas would be 17.45 L.
Ideal gas equationFor an ideal gas:
PV = nRT, where P = pressure, V= volume, n = number of moles, T=temperature, and R = constant = 8.317 l•kpa/mol•k
In this case, n = 0.500 mole, T = 273K, P = 65.0 kpa.
Thus: V = nRT/P = 0.5 x 8.317 x 273/65 = 17.45 L
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Generally, what is the effect of increased temperature on the rate of dissolution of a solid solute?
Answer:
Increases
Explanation:
The general effect we see as temperature increases is that rate of dissolution of a solid solute increases,
Therefore, we can say that :
Temperature ∝ Rate of dissolution
20.4 L of 0.650 M HCI reacts with 36L of KOH solution of unknown concentration. What is the molarity of the KOH solution?
Answer: 0.37 M
Explanation:
[tex]M_{A}V_{A}=M_{B}V_{B}\\(20.4)(0.650)=M_{B}(36)\\M_{B}=\frac{(20.4)(0.650)}{36}=\boxed{0.37 \text{ M}}[/tex]
Which law of thermodynamics relates most directly to the Law of Conservation of Energy?
Answer:
First Law of Thermodynamics
Explanation:
The first law of thermodynamics is literally another name for the law of conservation of energy.
The pH of a solution is 0.50. To two decimal places, what is the hydrogen ion concentration of that solution
Explanation:
pH= –log¹⁰[H+]
0.50= –log¹⁰[H+]
log¹⁰[H+]=0.50
take the antilog of 0.50
[H+]= 3.16moldm-³
how many grams of hcl can dissolve in 200 g of water at 60 c?
The solubility curve is a plot of solubility against temperature.
What is solubility?The term solubility refers to the amount of substance that dissolves in solution at a given temperature. Hence, the solubility curve is a plot of solubility against temperature.
Thus, from the solubility curve (not shown) the amount if HCl dissolved can be obtained hence the question is incomplete.
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What is the correct formula for Triphosphorous hexachloride?
Answer:
P3
Explanation:
Im pretty sure hope this helps
2.58g of a gas has a volume of 3.97L at 745 mmHg and 21°C determine the molar mass of the gas what might be? ( first find n from the ideal gas law equation; then plug it into N = m/M or M = m/n)
The molar mass of the gas with the given mass and volume at the given temperature and pressure is 16.00g/mol.
What is the molar mass of the gas?From the Ideal gas law or general gas equation;
PV = nRT
Where P is pressure, V is volume, n is the amount of substance, T is temperature and R is the ideal gas constant ( 0.08206 Latm/molK )
Given that;
Temperature T = 21°C = (21 + 273.15)K = 294.15KPressure P = 745 mmHg = (745/760)atm = 0.98026atmVolume of the gas V = 3.97LMass of gas m = 2.58gAmount of gas n = ?First, we determine the amount of gas;
PV = nRT
n = PV / RT
n = ( 0.98026atm × 3.97L ) / ( 0.08206 Latm/molK × 294.15K )
n = 3.8916Latm / (24.137949Latm/mol)
n = 0.1612mol
Molar Mass = Mass of the gas / Amount of the gas
Molar Mass = m / n
Molar Mass = 2.58g / 0.1612mol
Molar Mass = 16.00g/mol
Therefore, the molar mass of the gas with the given mass and volume at the given temperature and pressure is 16.00g/mol.
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Determine the unknown mineral using the information given below. Be sure to use significant figure rules when doing calculations. Mass is shown on the triple beam. Scale Test Mineral Mineral H. Density, g/cc 10 diamond tellurium 2 2.07 9 corundum galena 2.5 7.58 8 topaz anglesite 2.5 - 3 6.4 7 quartz chalcocite 2.5 - 3 5.6 6 feldspar copper 2.5 - 3 9.0 5 apatite gold 2.5 - 3 19.3 4 fluorite silver 2.5 - 3 10.5 3 calcite arsenic 3.5 5.7 2 gypsum barite 3 - 3.5 4.4 1 talc dolomite 3.5 - 4 2.9 platinum 4.5 21.5 willemite 5.5 4.0 magnetite 6 5.18 pyrite 6 - 6.5 5.02 pyrolusite 6 - 6.5 5.0 cassiterite 6.5 6.9 diamond 10 3.52 Volume of water displaced = 0.051 L
Mass: 981.0, 908, 908.1, 981 g
Density: 192.35, 19,235, 19, 19.2 g/cc
Hardness 4, 2.5, 1, 3, 5.5 - 5, 3, 2, 4.5, 1.5
Determine the unknown mineral.
Platinum, Gold
The unknown mineral is gold because of the similar properties of gold to that unknown mineral.
What is unknown mineral?The unknown mineral is Gold because it has similar properties to the gold. Gold has density of 19.3 grams per cubic centimeter which is same to this unknown mineral. The hardness and mass of the mineral are also similar to the Gold.
So we can conclude that the unknown mineral is gold because of the similar properties of gold to that unknown mineral.
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How many
particles would
be found in a
2.74 g sample of
Beryllium sulfide?
Answer:
4.03 × 10²² particles of beryllium sulfide.
Explanation:
The formula to find the number of particles is:
Number of particles/atoms = number of moles × (6.02 × 10²³)
6.02 × 10²³ = Avogadro's number
But first, we will have to find the number of moles. This can be found using the formula:
Number of moles = mass ÷ Mr
Mr of BeS = 9 + 32.1 = 41.1
Number of moles = 2.74 ÷ 41.1 = 0.067 mol
Now that we know the number of moles, we can find the number of particles.
Number of particles = 0.067 × 6.02 × 10²³
∴ Number of particles = 4.03 × 10²²
Answer:
4.03 × 10²² particles
Explanation:
Had the same question and got it correct.
Would the following be an example of a physical or a chemical change?
- Methane (natural gas) is combined with oxygen to produce heat.
Select one:
a. chemical
b. physical
c. neither
it is chemical change because chemical change occur when bonds are broken or formed between molecules or atoms.
The price of a gallon of almond milk increases from $5 to $10, so people start buying more oat milk as an alternative. this causes a shift to the left in the demand for almond milk. demand for almond milk ____________ because of a change in ___________.
The demand for almond milk decreases because of a change in price from $5 to $10. Details about demand can be found below.
What is demand?Demand refers to the amount of goods a consumer is willing and able to buy at a given price and at a particular time.
Several factors can affect the demand of a particular good. According to this question, the price of a gallon of almond milk increases from $5 to $10, so people start buying more oat milk as an alternative.
Therefore, it can be said that the demand for almond milk decreases because of a change in price from $5 to $10.
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Answer:
decreased:related goods
Explanation:
ik it seems like decreased:income but i just took the test twice and ik for a fact its c not d
Please help me answer this
Answer:
1.01
Explanation:
you have to trust me
On a summer day, you take a road trip through Death valley, california in an antique car.you start put at a temperature of 20*c, but the temperature in death valley will reach a peak of 51*c. The tires on your car can hold 15.6L of nitrogen gas at a starting pressure of 249 kPa the tires will burst wjen internal pressure (PB) reaches 269k kPa awnser the following queshtions and show your work
- how many moles of nitrogen gas are in each tire
The number of moles of nitrogen gas in each tire would be 1.595 moles
Ideal gas lawThe ideal gas law is represented by the equation:
PV = nRT where P = pressure, V = volume, n = number of moles of gas, R = constant, and T = temperature.
In this case, P = 249 kpa, V = 15.6 L, R = 8.31, and T = 293 K (273 + 20).
n = PV/RT = 249 x 15.6/8.31 x 293 = 1.595 moles
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Almost All of the Energy reaching the Earth from the sun is in the form of ________.
Answer:
solar radiation
Explanation:
please answer ................
Answer:
Explanation:
i. SO2
ii. Na2O
Which is one possible way that animals would most likely be affected by this action?
Some animals would adapt.
Some animals would go extinct.
Some animals would evolve.
Some animals would be forced to migrate.
Some animals would be forced to migrate due to cutting of forest , Option D is the correct answer.
The complete question is
Humans clear-cut a forest. Which is one possible way that animals would most likely be affected by this action? Some animals would adapt. Some animals would go extinct. Some animals would evolve. Some animals would be forced to migrate.
What is deforestation ?Deforestation means cutting down trees of the forest for wood , or for making more space for living.
Deforestation leads to destruction of habitats of animals .
The balance of the nature gets disturbed , the sea and water bodies get dried up , leading to no water for the animals in the forest.
Animals need big bushes and trees to hide and live.
The Ecosystem gets destroyed because of the cutting of trees by human and so this has lead the animals to migrate.
Therefore Option D is the correct answer.
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Part g
consider the melting points of sugar and salt, as well as the states of sugar, salt, and oil
at room temperature. what can you conclude about the attractive forces between
particles in the three substances?
Salt and sugar have strong attractive forces whereas oil has weak attractive forces between particles.
What type of attractive forces present in salt, sugar and oil?The attractive forces between particles in the salt and sugar substances have strong because of its solid state while on the other hand, the attractive force between particles of oil is weak because of its liquid state.
So we can conclude that salt and sugar have strong attractive forces whereas oil has weak attractive forces between particles.
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The strength of the attractive forces between the molecule of oil, sugar and salt increases from oil to sugar to salt.
What is melting point of a substance?The melting point of a substance is the temperature at which the solid substance melts.
The melting point of a substance is a constant for a pure substance.
The higher the attractive forces between the molecules of a substance, the higher the melting point will be.
Between the three substances, oil has the lowest melting point while salt has the highest melting point.
Therefore, the strength of the attractive forces between the molecule of oil, sugar and salt increases from oil to sugar to salt.
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