Answer: The new pressure is 280 kPa.
Explanation:
Given: [tex]V_{1}[/tex] = 400.0 mL, [tex]T_{1} = 20^{o}C[/tex] , [tex]P_{1}[/tex] = 70.0 kPa
[tex]V_{2}[/tex] = 200.0 mL, [tex]T_{2} = 40.0^{o}C[/tex], [tex]P_{2}[/tex] = ?
Now, combined gas law is used to calculate the new pressure as follows.
[tex]\frac{P_{1}V_{1}}{T_{1}} = \frac{P_{2}V_{2}}{T_{2}}[/tex]
Substitute the values into above formula as follows.
[tex]\frac{P_{1}V_{1}}{T_{1}} = \frac{P_{2}V_{2}}{T_{2}}\\\frac{70.0 kPa \times 400.0 mL}{20^{o}C} = \frac{P_{2} \times 200.0 mL}{40.0^{o}C}\\P_{2} = 280 kPa[/tex]
Thus, we can conclude that the new pressure is 280 kPa.
An electromagnet can be made by wrapping wire around which object?
Answer: A wire the first answer gl on the quiz
Plz help me : 4.lodine, (two iodine atoms bonded together) is made up of:
all metals
all nonmetals
metal and nonmetal
Answer:
all non metals
Explanation:
iodine is a non metal, and if a metal had bonded with it, it would he considered a metal and non metal. But since two iodine atoms are bonded together, they are both non metals ( I2)
Formula
RnF3+
(2) Lewis dot structure
Formation of RnF₃⁺ will nat takes place easily or if it is form then it will decompose easily.
What is the Lewis dot structure?Lewis dot structure of any compound tells about the bonding and outermost electrons present in all the entities present in that compound.
Radon is a noble gas atom and have stable electronic configuration, but still they form radon flouride products due to the high electronegativity of flourine it attracts the lone pair of electrons of radon.
For the formation of compound promotion of 1, 2 or 3 electrons from the 6p orbital to the vaccant 6d orbitals will give rise to 2, 4 or half filled orbitals so they will form only products with odd number of atoms.
Hence RnF₃⁺ will not form any compound.
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How many moles are in 20.5 grams of Calcium (Ca)? (1pt)
A)762.45 moles
B)1 mole
C)2 moles
D)0.5 moles
Answer:
Number of moles in 20.5 grams of calcium (Ca) = 0.5 moles (Approx.)
Explanation:
Given:
Amount of calcium (Ca) = 20.5 grams
Find:
Number of moles in 20.5 grams of calcium (Ca)
Computation:
Number of moles = Gram weight / Atomic weight of substance
We know that, Atomic weight of calcium (Ca) is 40.078 u
Number of moles in 20.5 grams of calcium (Ca) = Amount of calcium (Ca) / Atomic weight of calcium (Ca)
Number of moles in 20.5 grams of calcium (Ca) = 20.5 / 40.078
Number of moles in 20.5 grams of calcium (Ca) = 0.511
Number of moles in 20.5 grams of calcium (Ca) = 0.5 moles (Approx.)
Select the correct answer
What is the noble gas configuration for silicon?
OA [Ne] 3s^2 3p^1
OB. [Ar] 4s^1
OC [Kr]5s^1
OD. [Ne] 3s^2 3p^2
Answer:
D
Explanation:
Silicon, element number 14 is the fourth element in the third period in the periodic table. Its electronic configuration is 1s^2 2s^2 2p^6 3s^2 3p^2.
The elemental symbol of the previous noble gas preceding the atom is replaced by the arrangement of the remaining electrons to form a noble gas configuration of an atom.
So for Silicon, we substitute [Ne] 1s^2 2s^2 2p^6 and the noble gas configuration can now be [Ne] 3s^2 3p^2.
If a photon dropping from the n = 7 to the n = 1 level hit the surface of Au, what would be the wavelength of the ejected electron in nanometers?
Answer:
here's the answer.hope it helps
Choose the correct statement. At a higher temperature……………..
1.Energies of particles increase
2.Rate of reaction increases
3.Particles collide more frequently
4.All correct
Answer:
4. All correct
Mark me brainliest and thenks :)))
QUESTION 62
Which of the following pH values represents the highest concentration of H30+ ions?
O pH 5.4
O pH 7.0
O pH 8.7
O All of the above have the same concentration of hydronium ions
O cannnot be determined with the given information
Answer:
5.4
Explanation:
The lower the pH the more H3o+ ions there are
Calculate the % dissociation of 0.10 M solution of acetic acid (pKa = 4.75)
Given :
Molarity of acetic acid solution, M = 0.10 M.
pKa of acetic acid, pKa = 4.75 .
To Find :
Percentage dissociation of 0.10 M solution of acetic acid.
Solution :
We know, [tex]pK_a = -log\ K_a[/tex]
Taking antilog both side, we get :
[tex]K_a = 1.78\times 10^{-5}[/tex]
Since, acetic acid has 1 hydrogen atom to loose , so it is a monoprotic acid.
Now, percentage dissociation of monoprotic acid is given by :
[tex]\alpha = \sqrt{\dfrac{K_a}{C}}\\\\\alpha =\sqrt{ \dfrac{1.78\times 10^{-5}}{0.1}}\\\\\alpha = 0.0133\times 100 = 1.33 \%[/tex]
Hence, this is the required solution.
20. A compound's empirical formula is C5H5O If the molecular mass of the compound is
162.2g, what is the molecular formula? NO LINKS PLEASE:)!
Answer:
Just use a text book.. So that you get the concept
Hence, [tex]C_{20}H_{20}O_4[/tex] is the molecular formula of a compound's empirical formula is [tex]C_5H_5O[/tex].
What is an empirical formula?The empirical formula is the chemical formula of a compound that gives the proportions (ratios) of the elements present in the compound but not the actual numbers or arrangement of atoms.
Divide the molar mass of the compound by the empirical formula mass. The result should be a whole number or very close to a whole number. Multiply all the subscripts in the empirical formula by the whole number
The molar mass of the empirical formula compound [tex]C_5H_5O[/tex] is 46.06844 g/mol.
The molecular mass of the compound is 162.2g given.
162.2g ÷ 46.06844
3.520848546 =4
[tex]C_{20}H_{20}O_4[/tex] is the molecular formula.
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70.8 g of CO is exposed 20.4 g of Hy and a reaction takes place.
CO + 2H2 - CH3OH
1. How many grams of methyl hydroxide (CH3OH) is produced?
2. What is the limiting reactant?
3. How much of the excess reactant is left unused?
literally what does any of this mean
Answer:
1. 80.9 g of CH₃OH
2. CO
3. 5.14moles
Explanation:
The reaction is:
CO + 2H₂ → CH₃OH
First place, we determine the moles of each reactant.
70.8 g . 1mol/ 28g = 2.53 moles of CO
20.4 g . 1mol / 2g = 10.2 moles of H₂
There is too much hydrogen, so the limiting reactant might be the carbon monoxide.
2 moles of H₂ react to 1 mol of CO
Then, 10.2 moles of H₂ may react to (10.2 . 1) /2 = 5.1 moles
We don't have enough CO, so it's ok that CO is the limiting. (We have 2.53 moles, we need 5.1 moles)
In the other hand, hydrogen is the excess reactant.
1 mol of CO react to 2 moles of hydrogen
2.53 moles may react to (2.53 . 2) /1 =5.06 moles
We have 10.2 moles, and we need 5.06 moles. Then (10.2 - 5.06) = 5.14 moles remains after the reaction goes complete.
Now that we know the limiting reactant, we can determine the grams of produced methanol. Ratio is 1:1
1 mol of CO produces 1 mol of CH₃OH
2.53 moles of CO must produce 2.53 moles of CH₃OH
We convert moles to mass: 2.53 mol . 32 g/mol = 80.9 g
One of the many isotopes used in cancer treatment is , with a half-life of 2.70 d. Determine the mass of this isotope that is required to give an activity of 205 C
The mass of this isotope that is required to give an activity of 205 C is 1.187 mg.
What is isotope?Isotope is defined as two or more different types of atoms with the same atomic number, but different nucleon values at different positions on the periodic table. Isotopes are forms of an element that have the same number of protons and electrons but differing numbers of neutrons.
Let's first translate the 2.70 day half life into seconds to obtain the following half life:
T(1/2) = 233300 sec
By subtracting the half life from ln(2)? = 2.971x10⁻⁶, determine the decay constant.
Now that we have the decay constant, we can solve for the quantity of isotopes required to produce an activity of 290 Ci (which is equal to 1.073x10¹³ decays per second) using the rate of decay equation. Due to the fact that we are discussing the beginning action, t = 0 for this equation.
-1.073x10³ = -A?e^(-? x 0)
Since we are losing isotopes rather than acquiring them, the left side of the equation is negative.
Fill in the blanks: A = 3.611x10¹⁸ isotopes
Find out how much mass is contained in all of these isotopes now.
(3.611x10¹⁸) x(198u) = 7.150x10²⁰ u
To get the final result, convert to mg at this point:
1.187 mg
Thus, the mass of this isotope that is required to give an activity of 205 C is 1.187 mg.
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The volume of a gas at 2.0 atm is 3.0 L. What is the volume of the gas at 1.5 atm at the same temperature?
0.50 L
1.0 L
1.5 L
4.0 L
By applying Boyle's law, the new volume of this gas is equal to: D. 4.0 L.
Given the following data:
Initial volume = 3.0 L.
New pressure = 1.5 atm.
Initial pressure = 2.0 atm.
How to calculate the new volume?In order to calculate the new volume of this gas, we would apply Boyle's law. Mathematically, Boyle's law is given by this formula:
PV = k
P₁V₁ = P₂V₂
Where:
P represents the pressure.V represents the volume.Making V₂ the subject of formula, we have:
V₂ = (P₁V₁)/P₂
Substituting the given parameters into the formula, we have;
V₂ = (2.0 × 3.0)/1.5
V₂ = 6.0/1.5
V₂ = 4.0 L.
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Answer:
D. 4.0 Liters
Explanation:
I took the exam
The graph represents the amount of energy in the
reactants and products of a chemical reaction.
If total energy is conserved, which statement
explains why the energy of the reactants does not
equal the energy of the products?
Energy
Energy of Energy of
Reactants Products
A.
The reaction is exothermic
B. The reaction is endothermic.
C. The reaction requires a catalyst.
D
The reaction has a low activation energy.
Answer: The correct answer is in an exothermic reaction the energy of the product is less than the energy of the reactants.
Explanation: got it
The energy of reactants is not equal to that of products as the reaction is an exothermic reaction.
What is an exothermic reaction?
An exothermic reaction is defined as a chemical reaction which involves release of energy in the form of light,heat .In these reactions, energy is transferred from system to surroundings rather than taking energy from surroundings into system as in endothermic reactions.
In an exothermic reaction,change in enthalpy is negative.Therefore, it can be inferred that net amount of energy which is required to start the exothermic reaction is less than the net amount which is released by the reaction.
Examples of exothermic reactions are combustion reactions, detonation of nitroglycerin , neutralization reactions and nuclear fission.
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In the next set of boxes, enter the mass number and atomic number of the alpha particle,
which has the same composition as the nucleus of a helium (He) atom. After filling in the
boxes in the Gizmo, what is the atomic mass of the first element?
New mass number
238
U
+
92
New atomic number
Answer:
234
Explanation:
From the question given above, the following data were obtained:
Alpha particle => ⁴₂He
²³⁸₉₂U —> ? + ⁴₂He
Let the unknown be ⁿₓZ. Thus, the equation becomes
²³⁸₉₂U —> ⁿₓZ + ⁴₂He
Next, we shall determine x, y and Z. This can be obtained as follow:
92 = x + 2
Collect like terms
92 – 2 = x
90 = x
x = 90
238 = n + 4
Collect like terms
238 – 4 = n
234 = n
n = 234
ⁿₓZ => ²³⁴₉₀Z => ²³⁴₉₀Th
Thus the balanced equation
²³⁸₉₂U —> ²³⁴₉₀Th + ⁴₂He
Therefore, the atomic mass of the first element is 234
Answer:
A: 234
B: 90
C: Th
D: 4
E: 2
F: He
Thank You!
Let's repeat this process for the atoms that make up the substances that do not conduct when dissolved in water. What do you notice now?
Answer:
Explanation:
If they do not disolve in water they are non electrolyte and hence will not conduct eletricity. If you had a lab where a batter was supplying power and the wire carryin the electricity went through a water bath if the water was pure and nothing disolved in it the light would not turn on but if you added something like salt it would conduct the electricity
No FILES PLZZ
What can all non-renewable resources theoretically be?
A
converted to nonmetallic minerals
B
converted to renewable ones
exhausted or depleted
D
recycled or reused
Answer:
B.
Converted to renewable ones
exhausted or depleted
Which of the following statements describes
an exothermic reaction but not an endothermic
reaction?
A. Energy is destroyed during the reaction.
B.
Energy is used to form chemical bonds.
C. Energy is used to break chemical bonds.
D. Energy is released as heat during the reaction.
Answer:
Energy is released as heat during the reaction.
Answer:
D. Energy is released as heat during the reaction.
Explanation:
Describe why chemists needed to invent a new counting unit.
Answer:
Why do chemists use the mole as a counting unit? Because chemical reactions often involve large numbers of small particles, chemists use a counting unit called the mole to measure amounts of a substance. ... The discovery enabled scientists to classify certain chemical reactions as transfers of electrons between atoms.Explanation:
Chemical reactions often involve large numbers of small particles, chemists use a counting unit called the mole to measure amounts of a substance.
Why is counting so important?It is not possible to vell with a single atom or molecule because we
can't count them.
Chemists have set a number of particles with which to toil that is convenient. As molecules are very small.
Thus, chemists use a counting unit called the mole to measure the amounts of a substance.
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A barrel of crude oil has a volume of 42 gallons, only approximately 45% of which is processed into gasoline. If your car achieves 37 mi/gal, and you drive 36,000 miles in one year, how many barrels of crude oil are required to run your car for a year?
How is dinitrogen (1) oxide distinguished shed from oxygen
Answer:
See Explanation
Explanation:
Both oxygen and dinitrogen (1) oxide are known to rekindle a glowing splint. However, oxygen is an odorless gas while dinitrogen (1) oxide has a faint smell and has an effect on the central nervous system.
Also, the combustion of dinitrogen (1) oxide produces brown fumes of nitrogen IV oxide.
Finally, when dinitrogen (1) oxide and oxgen are both heated with copper, residual nitrogen gas is left with dinitrogen (1) oxide while no residual gas is left with oxygen.
Put the levels of ecosystems in order from smallest to largest:
ecosystem, community, individual, population
Reorder answers
1.population
2.ecosystem
3.individual
4.community
A gas occupies 12.5 ft at - 173 °C. At what Celsius temperature will its volume be 16.0
it? Assume that pressure remains constant
Answer:
T₂ = 128.19 K
Explanation:
Given that,
The initial volume, V₁ = 12.5 ft³
Initial temperature, T₁ = -173 °C = 100.15 K
Final volume, V₂ = 16 ft³
We need to find the new temperature. The relation between temperature and volume is given by :
[tex]V\propto T\\\\\dfrac{V_1}{V_2}=\dfrac{T_1}{T_2}[/tex]
Put all the values,
[tex]T_2=\dfrac{T_1V_2}{V_1}\\\\T_2=\dfrac{100.15\times 16}{12.5}\\\\T_2=128.19\ K[/tex]
So, the new temperature is 128.19 K.
bahobilat at dakobilat
Answer:
sorry i didn't understand your question can you explain me your question have a good day hope its helps you ☺
How is thermal energy transferred during conduction? Check all that apply.
1.Thermal energy is transferred between particles that are not touching each other.
2.Thermal energy is transferred between particles that are in direct contact with each other.
3.Thermal energy is transferred between objects of different temperatures.
4.Thermal energy is transferred between objects of the same temperature.
5.Thermal energy is transferred from slow-moving particles to fast-moving particles.
6.Thermal energy is transferred from fast-moving particles to slow-moving particles.
Answer:
Thermal energy is transferred between particles that are in direct contact with each other.
Thermal energy is transferred between objects of different temperatures.
Thermal energy is transferred from fast-moving particles to slow-moving particles.
Explanation:
The net ionic equation for formation of an aqueous solution of Al(NO3)3 via mixing solid Al(OH)3 and
aqueous nitric acid is
Answer:
Al(OH)3 (s) + 3H+ (aq) → 3H2O (l) + Al3+ (aq)
Explanation:
The net ionic equation for the reaction between solid Al(OH)₃ and aqueous nitric acid, HNO₃ is
3H⁺(aq) + Al(OH)₃ (s) —> 3H₂O(l) + Al³⁺(aq)The reaction between Al(OH)₃ and HNO₃ will proceeds as follow:
HNO₃ (aq) —> H⁺(aq) + NO₃¯(aq)
HNO₃ (aq) + Al(OH)₃ (s) —>
H⁺(aq) + NO₃¯(aq) + Al(OH)₃ (s) —> H₂O(l) + NO₃¯(aq) + Al³⁺(aq)
Cancel the spectator ion (i.e NO₃¯)
H⁺(aq) + Al(OH)₃ (s) —> H₂O(l) + Al³⁺(aq)
Write 3 before H⁺ and H₂O to obtain the balanced ionic equation as shown below:
3H⁺(aq) + Al(OH)₃ (s) —> 3H₂O(l) + Al³⁺(aq)
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Without doing a calculation, arrange the following group of molecules in order of decreasing standard molar entropy (S^o ):
hexane (C6H14), benzene (C6H6), cyclohexane (C6H12)
a. C6H14 > C6H6 > C6H12
b. C6H6 > C6H12 > C6H14
c. C6H12 > C6H14 > C6H6
d. C6H14 > C6H12 > C6H6
e. C6H12 > C6H6 > C6H14
f. C6H6 > C6H14 > C6H12
Answer:
d. C6H14 > C6H12 > C6H6
Explanation:
Standard molar entropy has to do with the number of atoms that are present in each of the species. The greater the number of atoms possessed by the species, the higher the value of the standard molar entropy due to a greater number of vibration modes.
Hexane (C6H14) has the highest number of atoms followed by cyclohexane (C6H12) and lastly benzene (C6H6).
Thus the order of decreasing molar entropy is; C6H14 > C6H12 > C6H6.
Which explanation describes the first part of a chemical reaction? Reactants collide to form products. Products collide to form reactants. Products collide to form a transition state. Reactants collide to form a transition state.
Answer:
Reactants collide to form a transition state.
Explanation:
So sorry if I’m wrong but I feel this is right
To solve such this we must know the concept of chemical reaction. The correct option is option B that is atoms in one compound switch places with atoms in another compound.
What is chemical reaction?Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved.
There are so many types of chemical reaction reaction like combination reaction, double displacement reaction, combustion reaction, displacement reaction. "Reactants collide to form a transition state" describes the first part of a chemical reaction.
Therefore "Reactants collide to form a transition state" describes the first part of a chemical reaction. The correct option is option B.
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20. A compound's empirical formula is C,H,O. If the molecular mass of the compound is
162.2g, what is the molecular formula?
NO LINKS PLEASE THIRD TIME IM POSTING THIS ITS DUE IN 8min
Answer:
Just use a text book.. So that you get the concept
WILL MARK BRAINLIEST!
Stoichiometry DBA
1. 33 grams of Calcium Sulfate reacts with 28 grams of Aluminum Phosphate to form Calcium
phosphate and Aluminum Sulfate
Write balanced equation here -
2. Which of the two reactants will limit the production of Calcium Phosphate. Show work here.
3. How much of the Aluminum Sulfate would be produced? Show work here. 4. 44 grams of Zinc Nitrate reacts with 59 grams of Iron(III) Hydroxide to form Zinc Hydroxide
and Iron(III) Nitrate.
Write balanced equation here -
5. Which of the two reactants will limit the production of Iron(III) Nitrate . Show work here.
6. How much excess reactant will you have left over?
Answer:
Ca3(PO4)2..... the formula for Calcium phosphate