Answer:
A thermochemical equation for the combustion of propane (C3H8)(C3H8) is written as follows:
C3H8(l)+5O2(g)→3CO2(g)+4H2O(g);ΔH∘rxnC3H8(l)+5O2(g)→3CO2(g)+4H2O(g);ΔHrxn∘ = -2202.0 kJ/mol
The value given for ΔH∘rxnΔHrxn∘ means that:
a. the reaction of one mole of propane absorbs 2202 kJ of energy from the surroundings.
b. the reaction is endothermic.
c. the enthalpy of formation of propane is 2202 kJ/mol.
d. the reaction of one mole of propane releases 2202 kJ of energy to the surroundings.
e. None of these.
How many half-lives of time have passed when only a little more than 3% of a sample
original C-14 remains?
Answer:
5.06 half lives
Explanation:
1/2 ^n = .03 (.03 is 3% in decimal)
log both sides
n log 1/2 = log .03
n = 5.06 half lives
What's reaction kinetics?
Answer: a branch of chemistry concerned with the rate of chemical reactions, the factors that influence these rates, and the use of rate studies to clarify reaction mechanisms
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
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
What is the correct formula for Triphosphorous hexachloride?
Answer:
P3
Explanation:
Im pretty sure hope this helps
can you treat a sulfuric acid burn with sodium hydroxide
Answer:
I think yes
Explanation:
sorry i havent done these type a questions in a while
Cleaning PDB from the test tube after the experiment could be a long and arduous process. Describe the procedure that you will use to clean PDB (and the unknown solid) from your test tube after your experiments are complete.
The unknown solid is removed by rinsing with water while the PDB is removed by rinsing with alcohol.
What are solvents?Solvents are substances which dissolve other substances to form solutions or mixtures.
Water is used as a solvent for inorganic substances while organic solvents such as alcohol or kerosene are used as solvents for organic substances such as PDB.
Alcohol is added to the test tube containing PDB, which then dissolves. The tube is rinsed with more alcohol until all the PDB dissolves.
Therefore, the unknown solid is removed by rinsing with water while the PDB is removed by rinsing with alcohol.
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The use of lead paint in houses was banned in 1978 due to the health hazards associated with lead, specifically that
high levels of lead exposure is dangerous to humans. which branch of chemistry would study this?
Toxicology is the branch which studies about toxic chemicals and their effects.
What is Toxicology ?Toxicology is the branch in science in which the researches and study are done for finding the effect of the toxic or poisonous elements on plants , animals , human and earth at large.
High levels of lead exposure is dangerous to humans as it can cause permanent disabilities , it is carcinogenic and hence can lead to death.
This is studied in toxicology.
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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.
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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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
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).
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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please answer ................
Answer:
Explanation:
i. SO2
ii. Na2O
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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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:
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
A gas has a volume of 0.550 l at a temperature of -55.0 c. what will the volume be if the temperature is increased to 30.0 c and the pressure remains constant?
Gay-Lussac's law: [tex]\frac{V1}{T1}[/tex]=[tex]\frac{V2}{T2}[/tex]
We need to convert temperature from Celsius to Kelvin
-55 C = 218 K
30 C = 303 K
V2 = V1*T2 / T1 = 0.550 *303 / 218 = 0.764 l
Almost All of the Energy reaching the Earth from the sun is in the form of ________.
Answer:
solar radiation
Explanation:
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.
Why is the spectrum from our sun a combination of spectral types?.
calculate the mass of 3.5 moles of copper sulphate
Answer: 558.5545 g
Explanation:
The formula for a sulphate ion is [tex]\text{SO}_{4}^{\text{ }2-}[/tex], so the formula for copper sulphate is [tex]\text{CuSO}_{4}[/tex].
The atomic mass of copper is 63.546 g/mol.The atomic mass of sulfur is 32.065 g/mol.The atomic mass of oxygen is 15.994 g/mol.This means the formula mass of copper sulphate is:
63.546+32.065+4(15.994)=159.587 g/mol.So, in 3.5 moles, the mass is (159.587)(3.5)=558.5545 g
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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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]
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.
please ill mark u brilliant
+ 10 points
Which of the following is true for the equilibrium constant of a reaction? (5 pc
OIts value remains constant at different temperatures.
It is a ratio of coefficients of reactants to products.
It is represented by the symbol K.
Its value is always less than 1.
The equilibrium constant of the reaction is represented by the symbol K. Thus, option C is the correct and accurate statement about the equilibrium constant.
What is the equilibrium constant?The equilibrium constant is a representation of the concentration of the products and the reactants of the reaction that is raised to the powers through their stoichiometry coefficient.
Its value varies and changes at different temperatures and is not always less than 1. The equilibrium constant is the ratio of the coefficient of the products to reactants.
Therefore, option C. equilibrium constant is represented by K is true.
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What is the nuclear equation for decay of Am - 241
Americium is a radioactive element .
It goes through alpha decay during nuclear reactions .The nuclear reaction.is given by
[tex]\rm {}^{241}_{95}Am\longrightarrow {}^{237}_{93}Np+{}^4_2\alpha[/tex]
Np stands for NuptuniumHere alpha can be written as He too
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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In general the formation of a chemical bond lowers the _____ energy of a chemical system, leading to a _____ stable arrangement.
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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