The new volume V₂ is 5.4L
The new volume is calculated using Boyle's law formula
That is P₁V₁=P₂V₂
where,
p₁ = 852 torr
V₁ = 27.0
P₂ = 4260 torr
V₂=?
Make V₂ the subject of the formula by diving into both sides of the equation by P₂
V₂ = P₁V₁/P₂
⇒ 852 *
V₂ is, therefore, = 5.4 L
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2. A gas is confined in a syringe. When the volume of the cylinder is 750 L the pressure is
150 kPa. What will the volume of the cylinder be when the pressure has risen to 250
kPa?
Answer:
450 L
Explanation:
Because you are dealing with pressure and volume, you want to use Boyle's Law to find your missing value. The equation looks like this:
P₁V₁ = P₂V₂
In this equation, "P₁" and "V₁" represent the initial pressure and volume. "P₂" and "V₂" represent the final pressure and temperature. To find the final volume, you can plug the given values into the equation and simplify.
P₁ = 150 pKa P₂ = 250 pKa
V₁ = 750 L V₂ = ? L
P₁V₁ = P₂V₂ <----- Boyle's Law equation
(150 pKa)(750 L) = (250 pKa)V₂ <----- Insert variables
112500 = (250 pKa)V₂ <----- Multiply 150 and 750
450 L = V₂ <----- Divide both sides by 250
The ideal gas constant, R has several different values that could be used. Which quantity causes these differences?
O pressure
O temperature
O volume
O moles
Answer:
The answer is A
Explanation:
Polonium-208 is an alpha emitter with a half-life of 2.90 years. How many milligrams of polonium from an original sample of 2.00 mg will remain after 8.00 years
Answer:
0.296 mg
Explanation:
8.00/2.90 half lives have passed, so this means the remaining mass is
[tex]2.00 {(0.5)}^{8.00 \div 2.90} [/tex]
which is about 0.296 mg.
The amount of polonium remaining after 8.00 years is 0.296 mg. This is obtained by using rate law of first order kinetics.
What is the rate law of first order kinetics and the half-life of the compound?The expression for the rate law for first order kinetics is
k = [tex]\frac{2.303}{t}log\frac{a}{a-x}[/tex] years⁻¹
Where,
k - rate constant
t - time passed by the sample
a - initial amount of the reactant
a-x - final amount of the reactant
The expression for the half-life of the compound is
[tex]t_{\frac{1}{2}}=\frac{0.693}{k}[/tex] years
Calculating the amount of polonium remained after 8.00 years:Given that,
A Polonium-208 is an alpha emitter with a half-life of 2.90 years.
I.e., [tex]t_{\frac{1}{2}}[/tex] = 2.90 years
Then,
2.90 = (0.693)/k
⇒ k = (0.693)/(2.90) = 0.2389 years⁻¹
Then,
for t = 8.00 years,
Since we have rate law of first order kinetics as
k = [tex]\frac{2.303}{t}log\frac{a}{a-x}[/tex]
⇒ k = (2.303/8.00) log(a/a-x)
Where the initial amount of the reactants is a = 2.00 mg
So,
k = 0.287 log (2.00/a-x) (a-x is the final amount of the reactants)
⇒ 0.238 = 0.287 log(2.00/a-x)
⇒ (0.238/0.287) = log(2.00/a-x)
⇒ 0.829 = log(2.00/a-x)
⇒ (2.00/a-x) = [tex]10^{0.829}[/tex] = 6.745
⇒ (a-x) = 2.00/6.745 = 0.296 mg
Therefore, the remaining polonium is 0.296 mg after 8.00 years.
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A solution is made by dissolving 3.14 g of NaCl in 79.9 mL of water. What is the concentration of sodium chloride in units of weight/volume percent? Group of answer choices 3.78% (w/v) NaCl 96.1% (w/v) NaCl 3.93% (w/v) NaCl 0.0393% (w/v) NaCl
The concentration of sodium chloride in units of weight/volume percent is 3.93g/ml
Given that
3.93 (w/v) NaCl
Weight NaCl = 3.14g
Volume of water = 79.9mL
W/V is usually represented in g/mL, so no need to change anything
3.14g/79.9mL *100 = 3.93 g/mL (%)
One mole of NaCl contains 6.022 x 10 23 NaCl formula units.
• Use the mole quantity to count formulas by weighing them.
• Mass of a mole of particles = mass of 1 particle x 6.022 x 1023
• The mass of an atom in amu is numerically the same
as the mass of one mole of atoms of the element in grams.
• One atom of sulfur has a mass of 32.07 amu;
one mole of S atoms has a mass of 32.07 g.
Mass of 1 H atom: 1.008 amu x 1.661 x10-24 g/amu = 1.674 x10-24 g
Mass of 1 mole of H atoms:
1.674 x10-24g/H atom x 6.022 x1023H atoms = 1.008 g
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calculate no. of molecules in a spherical drop of water... radius = 0.1 mm and density of water = 1g/cm²
Answer:
1.49X10^20
Explanation:
hope this helps (´･ω･`)
A 1.50 g sample of a pure compound, containing only carbon and hydrogen, was
combusted in a carbon-hydrogen combustion analyzer. The combustion
produced 2.7 g of water (H₂O) and 4.4 g of carbon dioxide (CO₂.)
Calculate the mass of hydrogen.
Select one:
a. 2.001 g
b. 0.001 g
c.0.302 g
d. 1.192 g
The mass of the hydrogen is obtained as 0.302 g.
What is the mass of hydrogen?A hydrocarbon is a compound that contains only carbon an hydrogen. The amount of the carbon and the hydrogen can be found by combustion.
The mass of hydrogen can be obtained as follows;
Number of moles of hydrogen =2.7 g/18 g/mol * 2 = 0.302 moles
Now the mass of hydrogen is obtained from;
0.302 moles * 1 g/mol = 0.302 g
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The main combustible part of wood is cellulose, a compound of carbon, hydrogen, and oxygen, which, when it burns, breaks down to _____, water, and heat.
The main combustible part of wood is cellulose, a compound of carbon, hydrogen, and oxygen, which, when it burns, breaks down to carbon dioxide, water, and heat.
What is Combustible Substance ?The substances which catches fires easily in air and produce heat and light upon burning is known as Combustible Substances.
Example: Wood, Oil, Kerosene, Hydrogen gas, Cloth etc.
When these compounds carbon, hydrogen and oxygen burns completely the carbon oxidizes to carbon dioxide , water and heat.
Thus from the above conclusion we can say that The main combustible part of wood is cellulose, a compound of carbon, hydrogen, and oxygen, which, when it burns, breaks down to carbon dioxide, water, and heat.
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Calculate the heat released when 12.5g of water, at its freezing point, freezes.
16700 J
8350 J
4170 J
12543 J
Answer:
4170 j
Explanation:
water has low melting point
How can gamma rays be harmful?
OA. They consist of high-energy radiation that can travel through most
materials.
B. They are large particles that can break apart other particles.
C. They are fast-moving particles that can penetrate the skin.
D. They are small, slow particles that can cause uncontrolled chain
reactions.
Answer:
option c
Explanation:
They are fast-moving particles that can penetrate the skin.
What coefficients are needed to balance the following:
Cu(NO3)2 + GaI3 →CuI2 + Ga(NO3)3
What coefficients are needed to balance the following:
Cu(NO3)2 + GaI3 →CuI2 + Ga(NO3)3
A. 2,3,3,2
B . 1,1,1,1
C. 2,3,2,3
D. 3,2,3,2
Beta particles are identical to Multiple Choice protons. helium atoms. hydrogen atoms. helium nuclei.
Correct option:
Beta particles are identical to "electrons".
What are particle beams:
There are various types of particle beams, such as (alpha) and (beta) particles, neutron beams, etc. While β-particles are electrons released from a nucleus, helium nuclei made up of two protons and two neutrons are known as α-particles.
When certain radionuclides undergo a process known as beta-decay, high-energy, high-speed electrons (e-) or positrons (p+) are released from the nucleus.
An electron and a beta particle share the same mass and charge.
Beta radiation in high doses can burn the skin, and beta emitters are dangerous if they penetrate the body. Thin sheets of metal or plastic may be able to stop beta particles.
Note: Your question is incomplete, but most probably your full question also includes one more option "Electron".
Beta particles are identical to
Multiple Choice
1. protons. 2. helium atoms. 3. hydrogen atoms. 4. helium nuclei. 5. electrons.
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Step 8: Measure Pressure and Volume with the Book
and 3 kg of Weight
Total the mass on the syringe. Record it in the
correct row of the data table.
kg
According to Boyle's law of gases, the volume of the gas will decrease when increasing the pressure of the gas in the syringe by adding weights above the syringe.
What is the statement of Boyle's law?Boyle's law of gases states that the pressure of a given mass of gas is inversely proportional to the volume of the gas.
In the given, increasing the pressure of the gas in the syringe by adding weights above the syringe will result in a decrease in the volume of the gas.
On the other hand, decreasing the pressure will result in an increase in the volume of the gas.
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Answer:
1. 3.498
2. 1.37
3. 37.5
4. 51.4
Explanation:
what are the properties of most transition metals
Explanation:
The transition metals have the following physical properties in common:
they are good conductors of heat and electricity
they can be hammered or bent into shape easily
they have high melting points (but mercury is a liquid at room temperature)
they are usually hard and tough
they have high densities
The transition metals have the following chemical properties in common:
they are less reactive than alkali metals such as sodium
they form coloured ions of different charges
some are very unreactive (silver and gold)
many are used as catalysts
A) If an atom has 13 protons how many electrons will it have justify your answer
B) nucleus of an atom consists electrons. Do you agree with this statement? Justify your answer
Answer:
13
Explanation:
because the number of protons and electrons in the atom are the same
Rank protons, neutrons, and electrons according to their mass. Identify the charge of each and their location
Answer:
discuss the successes and the short comings of the conservative reaction to the french rvolution as seen in the actions of the congress of vienna and the holy aliance?
K2CO3 = K2O +
How to complete this chemical equation so that the chemical reaction is decomposition
Answer:
K2CO3 = K2O + CO2
Explanation:
In a chemical equation, the number of atoms on the left needs to be balanced with the number of atoms on the right, and there has to be the same number of the same *type* of atom on both sides as well.
On the left:
2 K
1 C
3 O
and on the right,
2 K
1 O
On the right, there are a few atoms missing, specifically, 1 C and 2 O.
The missing atoms then should be added to the side missing the atoms, preferably in a stable molecule. Luckily, CO2 contains exactly 1 C, and 2 O s, and is quite stable. So, a "CO2" has to be added on the left
How does a fire extinguisher works ?
Answer:
Most fire extinguishers work by separating the fuel from the oxygen. The oxygen comes from the air. It is the same oxygen we breathe. Since the oxygen has to be in contact with the fuel, if you can coat the fuel with something that keeps the oxygen away, the fire will go out. Some ways of using fire extinguisher are:
Water extinguishers work mainly by cooling (removing heat), but a dense spray of water droplets also helps to cut off oxygen. Dry powder extinguishers soak up heat, melt on the fuel, and cut off oxygen, but they also neutralize the fuel (cutting it off from the fire) .Explanation:
I hope it was helpful...
I2 (s) has a very low solubility in H2O (l) because the weak _____ forces between I2 and H2O are not strong enough to replace the _____ between the H2O molecules.
I2 (s) has very low solubility in H2O (l) because the weak dipole-induced dipole forces between I2 and H2O are not strong enough to replace the hydrogen bonds between the H2O molecules.
Dipole interactions are susceptible interactions that get up from the close association of permanent or precipitated dipoles. Collectively these forces are called Van der Waals interactions. Proteins incorporate a massive number of these interactions, which vary substantially in energy.
Solubility depends on the solvent's capacity to overcome the intermolecular forces in a solid. Red blood cells have an excessive concentration of dissolved ions. When positioned into pure water they rupture.
Polar species are soluble in water, whilst nonpolar species are soluble in oils and fats. Covalent solubility uses the like dissolves like a rule. This means that materials with an equal form of polarity might be soluble in one another. moreover, compounds with differing polarities might be insoluble in one another.
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To be effective, collisions between atoms must occur with the proper orientation and also the proper amount of __.
explosion
matter
energy
catalysis
To be effective, collisions between atoms must occur with the proper orientation and also the proper amount of energy.
What is the loss of kinetic energy due to the collision?An inelastic collision is a collision in which there is a loss of kinetic energy. While the momentum of the system is conserved in an inelastic collision, the kinetic energy is not. This is because some kinetic energy has been transferred to something else.
In this case, is necessary have energy to be effective, so collisions between atoms must occur with the proper orientation.
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Answer:
energy
Explanation:
hi I really need help with this.
Balance the following neutralization reactions:
_______ HBr + _______ KOH _______KBr + _______H2O
_______ HF + _______ Fe(OH)3 _______FeF3 + ______ H2O
______HCl + _______ Ca(OH)2 _______CaCl2 + ______ H2O
Answer:
Explanation:
In order to balance equations, simply alter coefficients until all elements are equal on both sides of the reaction symbol ”—>”:
1HBr + 1KOH —> 1KBr + 1H2O
The reaction is already balanced
3HF + Fe(OH)3 —> FeF3 + 3H2O
To match the 3 Flluorines on the right hand side, add 3 to HF and then add 3 to H2O to compensate for the increase in hydrogens.
2HCl + Ca(OH)2 —> CaCl2 + 2H2O
The Chlorine must be balanced, and then hydrogen must be balanced.
Hope this helps! If it did, I would appreciate if you provided brainliest!
what happens if the same zero error occurs in every reading
Zero error occur in every reading means that the measuring instrument needs to recalibrated and adjusted.
What is Zero error?This error occurs when a measuring instrument reflects a digit which isn't zero despite the real value being zero.
When this occurs, only the zero screw on the device should be adjusted so as to correct this technical error. This is why recalibration should be the most appropriate solution.
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If 31.2 mL of 0.45 M sodium hydroxide is mixed with 65.4 mL of 0.088 M phosphoric acid, how many kJ of heat are produced
Heat produced is given by -0.813 kJ
Calculation of heat produced:
The reaction:
[tex]3NaOH + H_3PO_4 \rightarrow Na_3PO_4 + H_2O[/tex] ΔH[tex]_{rxn}[/tex]= -173.7 kJ (Assumed)
Step 1: Calculation of moles using Molarity.
Volume of NaOH= 31.2 mL
Concentration= 0.45M
[tex]M=\frac{n}{V}\times1000\\\\n=\frac{M\times V}{1000} \\\\n= \frac{31.2\times0.45}{1000}\\n= 0.01404[/tex]of NaOH
Volume of [tex]H_3PO_4[/tex] = 65.4 mL
Concentration= 0.088M
[tex]n=\frac{0.088\times 65.4}{1000}\\\\n= 0.005755[/tex] mole of [tex]H_3PO_4[/tex]
Step 2: Limiting reagent
According to the above reaction
1 mole of [tex]H_3PO_4[/tex] reacts with 3 mole of NaOH
0.005755 moles will react with [tex]3\times 0.005775 \, NaOH[/tex]= 0.017 moles of NaOH is required. But we have 0.01404 moles of NaOH.
So NaOH is the limiting reagent.
Step3: Calculate ΔH:
We will limiting reagent to calculate the heat produced-
[tex]0.01404 \,mole \times\frac{-173.7}{3}= -0.813\, kJ[/tex]
Heat produced= -0.813 kJ
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The table shows the nature of the reactants and products formed in a certain type of chemical reaction. Nature of Reactants and Products Reactants Products Ionic compound + Ionic compound Ionic compound + Ionic compound Which of the following is true about this type of chemical reaction? (4 points) Group of answer choices It is a single replacement reaction, and all four compounds are different. It is a double replacement reaction, and all four compounds are different. It is a single replacement reaction, and each compound has the same set of ions. It is a double replacement reaction, and each compound has the same set of ions.
The given reaction is a double replacement reaction; option B.
What is a chemical reaction?A chemical reaction is a reaction in which chemical changes occurs in the atoms of reactants which results in the formation pf products.
The given reaction is as follows:
Ionic compound + Ionic compound ---> Ionic compound + Ionic compoundSince exchange of ions occur, it is a double replacement reaction.
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1.25 grams of unknown acid was dissolved in 15.00 mL of water and then titrated with 0.100 M NaOH(aq). The
equivalence point was reached after 20.00 mL of the NaOH solution had been added. Using the data determine
What is the molar mass of the acid?
The molar mass of the acid, given the data is 625 g/mole
What is equivalence point?This is a point is a titration reaction where the amount of the acid added is enough to neutralize the base
This simply implies that the number of mole of the acid used is equal to the number of mole of the base.
How to determine the mole of the baseVolume of base (NaOH) = 20 mL = 20 / 1000 = 0.02 LMolarity of base (NaOH) = 0.1 MMole of base (NaOH) = ?Mole = molarity × volume
Mole of base (NaOH) = 0.1 × 0.02
Mole of base (NaOH) = 0.002 mole
How to determine the molar mass of the acidMole of base (NaOH) = 0.002 moleMole of acid = Mole of base (NaOH) = 0.002 moleMass of acid = 1.25 gMolar mass of acid =?Molar mass = mass / mole
Molar mass of acid = 1.25 / 0.002
Molar mass of acid = 625 g/mole
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1. How many grams of iron (II) oxide can be produced from 3.4 g of iron in this balanced equation?
4Fe +3022Fe₂O3
2. How many grams of magnesium carbonate is produced from 6.7 g of magnesium oxide in this
balanced equation?
MgO + CO₂ → MgCO3
3. How many grams of calcium hydroxide is produced from 9.4 g of calcium chloride in this balanced
equation?
CaCl₂ + 2NaOH → 2NaCl + Ca(OH)2
Answer:
3.12g FeO3
14.33g MgCO3
5.92g Ca(OH)2
Explanation:
For the first problem, convert grams of Fe to mols of Fe.
molar mass of Fe: 55.845
Grams of Fe: 3.4g
3.4/55.845 = 0.06 mol Fe
There are 4 Fe for every 2 FeO3
So.. 0.06(2/4) = 0.03 mol FeO3
Multiply the mols by the molar mass of FeO3
Molar mass of FeO3: 103.845
0.03 * 103.845 = 3.12 g FeO3
Prepare a project report on various samples of
a) a mixture
b) a compound
c) an element ( metal or non metal)
( 2 from each ) highlighting the main characteristics features of elements, compounds and mixtures.
detailed answer plsss
This refers to the material that is made when different substances mix up physically and causes a reaction.
You can make on the project of Mixture -
1) Alloys2)Colloids3) Suspension4) SolutionB) CompoundThis refers to the chemical bond that holds different atoms tightly
You can make on the project of Compound -
1)Water2)Methane3)Carbon Dioxide4) Sulfuric AcidC) ElementsBased on the fact that the atom is the smallest indivisible part of an element, elements like phosphorous cannot be further broken down.
You can make on the project of Elements -
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chemistry
state two industrial uses of hydrogen
Answer:
refining petroleum, treating metals, producing fertilizer, and processing foods.
A garbage collector collects food wrappers and aluminum cans from a park. what type of waste is the garbage collector collecting?
Answer:
Explanation:
Food wrappers and aluminium wrappers are widely use for packing various eatable items.
For example, in our homes our mother wraps our food for lunch in aluminium foil.
As it helps in keeping the food warm for hours.
Thus, we can conclude that out of the given options, a packaging waste is the garbage collector collecting.
Calculate the concentration of H3O ions present in a solution of HCl that has a measured pH of 5.310 .
[tex]\\ \tt\leadsto -log[H^+]=5.31[/tex]
[tex]\\ \tt\leadsto log[H^+]=-5.31[/tex]
[tex]\\ \tt\leadsto [H^+]=antilog(-5.31)[/tex]
[tex]\\ \tt\leadsto [H^+]=4.89\times 10^{-6}M[/tex]
25. An equilibrium mixture of SO2 (g), O2 (g), and SO3 (g) is transferred from a 1.00L flask to a 2.00-L flask. In which direction does the reaction proceed to restore equilibrium
This chapter deals with chemical equilibrium, or how far chemical reactions proceed. Some reactions convert reactants to products with near 100% efficiency but others do not.
Chemical equilibrium is a dynamic process and occurs when the rates of two opposing processes (reactions) become the same. Unless conditions are somehow changed, the concentrations of both reactants and products remain constant after equilibrium is achieved.
Consider the decomposition reaction in which N2O4 (g) ' 2 NO2(g) What happens to the concentration of each, based upon the rate equations, as the reaction proceeds
Assuming reversible elementary processes, Rate (forward) = k (forward) x [N2O4] and rate (reverse) = k (reverse) x [NO2]2As [N2O4] decreases, rate forward decreases, and, as [NO2] increases, rate reverse increases, but more quickly.
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