Answer:
speed and direction are the two things
The pressure of a sample of helium is 1.556 atm in a 268.5 mL container. If the container is compressed to 112.4 mL without changing the temperature, what is the new pressure?
a. 3.72
b. 0.651
c. 1.94e4
d. 277
Answer:
a. 3.72 [atm]
Explanation:
For a gas at constant temperature, (with no change in number of molecules of the gas), we can apply Boyle's Law: [tex]P_1V_1=P_2V_2[/tex]
[tex](1.556[atm])(268.5[mL])=P_2(112.4[mL])[/tex]
[tex]\dfrac{(1.556[atm])(268.5[mL\!\!\!\!\!\!\!\!{--}])}{112.4[mL \!\!\!\!\!\!\!\!{--}]}=\dfrac{P_2(112.4[mL]\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!{-----})}{112.4[mL]\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!{-----}}[/tex]
[tex]3.716957[atm]=P_2[/tex]
It seems like the answer should have 4 significant figures since all of the other quantities have 4 significant figures, but the closest answer choice of those provided is a. 3.72
There are 164 g H3PO3 formed during a
reaction. How many moles of H₂O are
required? (H3PO3: 82 g/mol)
Answer:
13448
Explanation:
i think im wrong but
164(82)=13448
it's 82g/mol) for this question
The first step in the formation of all three products is the loss of the ots leaving group to give a carbocation intermediate. this intermediate is resonance-stabilized, and products b and c are generated from a different resonance structure than the one used to generate product a. draw the other resonance structure (using the carbon skeleton provided) and add curved arrow(s) to convert the first resonance structure into the second one.
The carbocation stabilized by resonance structure and thereby lowers the energy of the carbocation, hydrogen will add to the carbon in the double bond that produces delocalization of electrons.
What is carbocation?A carbocation is a molecule in which a carbon atom has a positive charge and three bonds.
In general, electrons are stabilized by delocalization. The stabilization energy engendered by delocalization over more than two atoms is called the resonance stabilization energy or simply the resonance energy. The greater the extent of electron delocalization the greater the resonance stabilization.
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How many grams of oxygen are contained in a sample of H2O that also contains 3.85 moles of hydrogen atoms?
Answer:
30.8 g oxygen
Explanation:
There are 1/2 as many Oxygen moles as hydrogen moles in H2O
so there are 3.85 / 2 * 16 gm of oxygen = 30.8 gms oxygen
What is the correct formula that would result from the combination of the two ionic species?
Cs¹+ and Cl¹-
Answer: CsCl
Explanation:
When naming ionic compounds, the metal comes before the nonmetal.
The table below shows the electronegativity values of various elements on the periodic table.
Electronegativities
1
2
15 16 17
24
3A 4A 5A 6A 7A
Li Be
8
F
1.0 1.5
2.0 2.5 3.0 3.5 4.0
Na Mg
P
0.9 1.2
1.5 1.8 2.1 2.5 3.0
K
Ca
Ge As Se Br
1.8 2.0 2.4 2.8
0.8 1.0
Rb Sr
2.5
0.8 1.0
Cs Ba
0.7 0.9
Which pair of elements would form an ionic bond?
O carbon (C) and oxygen (0)
H
2.1
a
ON
00
O
An ionic bond can be formed between Na and O, Mg and F or Li and H since they have large differences in their electronegativity values.
What are ionic bonds?Ionic bonds are the bonds present in ionic compounds.
Ionic bonds are formed due to the electrostatic forces of attraction that exist between oppositely-charged ions.
Ionic bonds are formed between elements whose electronegativity values are far apart.
Thus, based on the given electronegativity values, an ionic bond can be formed between Na and O, Mg and F or Li and H.
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An ionic bond can be formed between Na and O, Mg and F or Li and H since they have large differences in their electronegativity values.
What are ionic bonds?Ionic bond, also called an electrovalent bond, type of linkage formed from the electrostatic attraction between oppositely charged ions in a chemical compound.
Metal atoms form positive ions, while non-metal atoms form negative ions. The strong electrostatic forces of attraction between oppositely charged ions are called ionic bonds.
Ionic bonds are formed between elements whose electronegativity values are far apart.
Thus, based on the given electronegativity values, an ionic bond can be formed between Na and O, Mg and F or Li and H.
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What mass of H2 forms when
35.25 g Al reacts with excess
hydrochloric acid?
2AI + 6HCI →→2AICI 3 + 3H₂
Based on the mass ratio, the mass of H₂ produced is 3.51 g of H₂
What is the mass ratio of a reaction?The mass ratio of a reaction is the ratio of the masses of the reactants as well as as products in a balanced equation of a reaction.
The equation of the reaction is given below;
2 AI + 6 HCI → 2 AICI₃ + 3 H₂
From the reaction equation, 2 * 27 g of Al produces 3 * 2 g of H₂
32.25 g of Al will produce: 6/55 * 32.25 g of H₂
Therefore, mass of H₂ produced is 3.51 g of H₂
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Answer:
From the reaction equation, 2 * 27 g of Al produces 3 * 2 g of H₂
32.25 g of Al will produce: 6/55 * 32.25 g of H₂
Therefore, mass of H₂ produced is 3.51 g of H₂
Explanation:
balanced equation for bromine and potassium iodide?
Answer:
Br2+KI→KBr+I2
Explanation:
Question 10 of 10
Why are railroad tracks built with a flexible expansion and contraction joint?
OA. The tracks have a larger coefficient of linear expansion than the
ground beneath.
B. The two have equal coefficients of linear expansion.
C. The ground beneath has a larger coefficient of linear expansion
than the tracks.
OD. The tracks have a smaller coefficient of linear expansion than the
ground beneath.
Railroad tracks built with a flexible expansion and contraction joint because the tracks have a larger coefficient of linear expansion than the ground beneath. Hence, Correct opotion is option (A)
Where is linear expansion used?The linear expansion of a solid under a change in temperature can be measured using Δℓ/ℓ = αΔT and has applications in the ways solids expand and contract in everyday life.
The strain that the object undergoes has implications in engineering when fitting objects among each other.
Hence, Railroad tracks built with a flexible expansion and contraction joint because the tracks have a larger coefficient of linear expansion than the ground beneath. Therefore, Correct opotion is option (A)
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justify the statement nuclear energy is harmful as well as useful
What will be the next step in this calculation?
V = 2.188x10^6 x 2
————————
3
V = Answer
————
3
V = (what you got)
Try finding them with calculator or something.
Hope this helps.Good luck ✅.And I wish this can still help.If air was not allowed to stream
through the kiln, how would the
production of lime be affected?
Explain your answer.
Answer:
The air flow carries away the carbon dioxide formed during the decomposition. Once accumulated in the furnace or if the air was not allowed to stream through, it begins to react again with the newly formed calcium oxide, equilibrating rather than completing the reaction.
what is formed when mixing a weak acid and strong base
Explanation:
when a weak acid and a strong based are mixed they react the pH can be determined by consider ing the equilibrium
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.
Answer:
please mark me as brain list
Explanation:
Any substance that contains only one kind of an atom is known as an element. Because atoms cannot be created or destroyed in a chemical reaction, elements such as phosphorus (P4) or sulfur (S8) cannot be broken down into simpler substances by these reactions
Example: Water decomposes into a mixture of hydrogen and oxygen, on the other hand, cannot be decomposed into simpler substances. They are therefore the elementary, or simplest, chemical substances elements.
Each element is represented by a unique symbol. The notation for each element can be found on a periodic table of elements.
The elements can be divided into three categories that have characteristics properties: metals, nonmetals and semimetals. Most elements are metals, which are found on the left and toward the bottom of the periodic table. A handful of nonmetals are clustered in the upper right corner of the periodic table. The semimetals can be found along the dividing line between the metals and the nonmetals.
a burning candle wax reacts with oxygen. after a glass jar is placed over it, the candle goes out. what is the limiting reactant?
If the candle goes out when a glass jar is placed over it, then oxygen is the limiting reactant.
What is a limiting reactant?The limiting reactant is the reactant that is present in the least amount. When the limiting reactant is exhausted, the reaction comes to a halt.
Thus, if the candle goes out when a glass jar is placed over it, then oxygen is the limiting reactant.
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a sample of helium gas has a volume of 1.00 l. what is the final volume if both the pressure and kelvin temperature each double?
If the both pressure and temperature of the helium gas is doubled, the final volume is 1.00 Liters.
What is the final volume of the helium gas?Combined gas law put together both Boyle's Law, Charles's Law, and Gay-Lussac's Law. It states that "the ratio of the product of volume and pressure and the absolute temperature of a gas is equal to a constant.
It is expressed as;
P₁V₁/T₁ = P₂V₂/T₂
Given that;
Initial volume V₁ = 1.00LInitial Pressure = PInitial temperature = TFinal pressure = 2PFinal temperature = 2TFinal volume V₂ = ?P₁V₁/T₁ = P₂V₂/T₂
P₁V₁T₂ = P₂V₂T₁
V₂ = P₁V₁T₂ / P₂T₁
V₂ = ( P × 1.00L × 2T ) / ( 2P × T )
V₂ = ( 2.00L × P × T ) / ( 2 × P × T )
V₂ = ( 1.00L × P × T ) / ( × P × T )
V₂ = 1.00L
If the both pressure and temperature of the helium gas is doubled, the final volume is 1.00 Liters.
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Add distilled water to the beaker until the volume
totals 15 mL.
Record the amount of sodium chloride that
dissolved.
Ionic compounds such as sodium chloride, which dissolve in water and dissociate to form ions, are called electrolytes.
What are electrolytes?Electrolytes are substances that have a natural positive or negative electrical charge when dissolved in water.
Water molecules pull the sodium and chloride ions apart, breaking the ionic bond that held them together. After the salt compounds are pulled apart, the sodium and chloride atoms are surrounded by water molecules, as this diagram shows. Once this happens, the salt is dissolved, resulting in a homogeneous solution.
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Q2. Name, constituent of petroleum (Petrochemicals) which is used for following purposes.
(i) To make candles.
(ii) A solvent for dry cleaning
(iii) For surfacing roads.
(iii) Jet engine fuel.
(v) For lubrication.
The constituents of petroleum that are used for the following purposes are as follows:
To make candles ----- Paraffin waxA solvent for dry cleaning ----- PetrolFor surfacing roads ----- BitumenJet engine fuel ----- KeroseneFor lubrication ----- Lubricating oil.What are the constituents of petroleum?The constituents of petroleum are LPG, bitumen, paraffin wax, lubricating oil, kerosene, diesel, etc. These compounds are a mixture of hydrocarbons.
Therefore, each constituent of petroleum that is used for the following purposes is mentioned above with proper names.
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Answer this please!!!
Answer:
c
Explanation:
The answer is both i and iii.
PLEASE HELP FAST! When 23.3 g of O2 reacts with 18.3 g C10H8, what is the limiting reactant. The equation is C10H8 + 12O2 --> 10CO2 + 4H2O?
Choices:
A. C10H8
B. O2
C. CO2
D. H2O
Answer:
B
Explanation:
The answer is B, O2
O₂ is the limiting reagent.
What is a limiting reactant?A limiting reactant is described as the one that will be consumed first in a chemical reaction.
CalculationC₁₀H₈ + 12O₂ → 10CO₂ + 4H₂O
Given, Mass of O₂ = 23.3 g
Mass of C₁₀H₈ = 18.3 g
Molar mass of O₂ = 32 g
No. of moles of O₂ = 32/23.3 = 1.4 moles
Molar mass of C₁₀H₈ = 128 g
No. of moles of C₁₀H₈ = 128/18.3 = 6.9 = 7 moles
According to the equation,
1 mole of C₁₀H₈ yields 10 moles of CO₂. So, 7 moles of C₁₀H₈, give 70 moles of CO₂.
12 moles of O₂ yields 10 moles of CO₂. So, 1.4 moles of O₂ give 1.16 moles of CO₂.
We do know, however, that based on our balanced equation, if we were to totally react all 1.4 moles of O2, we could only produce a maximum of 1.16 moles of CO2. Even while there is enough C10H8 to generate more, the amount of O2 we have is a limiting factor because it will be consumed first.
So, our limiting reactant is O₂.
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Fast food and juice boxes are example of which of these?
group of answer choices
habitat destruction
air pollution
water pollution
overpackaging
i need a answer within 20 mins i will give 30 points
Answer:
habitat destruction I think
Explanation:
The hydrogen emission spectrum is shown below. What is the energy of the
410 nm emission line? (The speed of light in a vacuum is 3.00 x 108 m/s, and
Planck's constant is 6.626 x 10-34 J.s.)
400
750 pm
Answer:
C.) 4.85 x 10⁻¹⁹ J
Explanation:
To find the energy, you need to use the following equation:
E = hc / w
In this formula,
-----> E = energy (J)
-----> h = Planck's Constant (6.626 x 10⁻³⁴ J*s)
-----> c = speed of light (3.00 x 10⁸ m/s)
-----> w = wavelength (m)
Once you have converted nanometers to meters, you can plug the given values into the equation and solve.
410 nm 1 m
------------- x ---------------------- = 4.10 x 10⁻⁷ m
1 x 10⁹ nm
E = hc / w
E = (6.626 x 10⁻³⁴ J*s)(3.00 x 10⁸ m/s) / (4.10 x 10⁻⁷ m)
E = 4.85 x 10⁻¹⁹ J
in this experiment, calcium hydroxide was partially dissolved in pure water. which of the following choices correctly expresses the relationship between [ca2 ] and [oh−] in this mixture?
The relationship between [tex][Ca2^{2+}][/tex] and [tex][OH^{-}][/tex] in this mixture is that there are 2 mole of hydroxide ions for every 1 mole of calcium ions.
What is solubility of a solute?The solubility of a solute is the amount of solute that can dissolve in a given volume of solvent at a particular temperature.
Calcium hydroxide is partially soluble in water. The dissolution of calcium hydroxide in water produces calcium ions and hydroxide ions.
The equation of the reaction is given below:
[tex]Ca(OH)_{2} \leftrightharpoons Ca^{2+} + 2\:OH^{-}[/tex]
Based on the equation of reaction, there are 2 mole of hydroxide ions for every mole of calcium ions.
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Find the magnetic force experienced by a proton moving with the speed of 3 × 105 m/s in the magnetic field B of magnitude 6 × 10-5 T.
The magnetic force experienced by a proton moving with a speed of 3 ×[tex]10^{5}[/tex] m/s in the magnetic field B of magnitude 6 ×[tex]10^{-5}[/tex] T will be 2.88×[tex]10^{-18}[/tex] N.
Magnetic force can be defined as the attraction or repulsion force that arises between electrically charged particles due to the motion of the charged particles.
Given,
Speed = 3×[tex]10^{5}[/tex] m/s
Magnetic Field, B= 6 ×[tex]10^{-5}[/tex] T
Magnetic force is the product of velocity, the charge of a proton, and the magnetic field present there.
The magnetic force can be represented as:
F=qvB
F=1.6×[tex]10^{-19}[/tex]×3×[tex]10^{5}[/tex] ×6 ×[tex]10^{-5}[/tex]
F=2.88×[tex]10^{-18}[/tex] N
Hence, the magnetic force experienced by the proton will be 2.88×[tex]10^{-18}[/tex] N.
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How many xenon atoms are contained in 2. 36 moles of xenon?.
Answer:
14.212 x 10^23 atoms
Explanation:
Xenon is a noble gas and is MONOTOMIC so
EACH mole is an Avagadro's Number of atoms
2.36 * 6.022 x 10^23 atoms =
Helpp!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
A homogenous mixture is that mixture in which the components mix with each other and its composition is uniform throughout the solution. A heterogenous mixture is that mixture in which the composition is not uniform throughout and different components are observed.
will you be my friend
Answer:
your cool
Explanation:
You test your hypothesis by completing a(n) _________.
You test your hypothesis by completing an experiment.
How we test our hypothesis?We test our hypothesis by performing experiment or research because in an experiment, we test our hypothesis and collect data in order to draw a conclusion from it.
So we can conclude that you test your hypothesis by completing an experiment.
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How many grams of aluminum will
react fully with 1.25 moles Cl₂?
2Al + 3Cl₂ → 2AlCl₃
mol Al = 2/3 x 1.25 = 0.83
mass Al = 0.83 x 27 g/mol = 22.41 g
According to the stoichiometry 21.66 grams of aluminum will react fully with 1.25 moles Cl₂.
What is stoichiometry?Stoichiometry is the determination of proportions of elements or compounds in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.
Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample.It is useful in balancing chemical reactions.
According to the chemical reaction between aluminium and chlorine, 2 moles of aluminium reacts with 3 moles of chlorine , thus,1.25 moles of chlorine will react 1.25×2/3=0.83 moles which is mass of aluminium =0.83×26=21.66 g.
Thus, 21.66 grams of aluminum will react fully with 1.25 moles Cl₂.
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A switch controls the current in a circuit that has a large inductance. The electric arc at the switch (Fig. CQ32.3) can melt and oxidize the contact surfaces, resulting in high resistivity of the contacts and eventual destruction of the switch. Is a spark more likely to be produced at the switch when the switch is being closed, when it is being opened, or does it not matter
When the circuit is opened, a spark is much more possible.
What is an inductor?The primary purpose of an inductor is the storage of energy. This is why an inductor helps to eliminate a spark in a circuit.
In the circuit as described in the question, we know that there is no current when the circuit is closed, the current across the inductor remains constant but rapidly decreases at the opening of the circuit this could lead to a spark.
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What is a chemical bond?
A. When electrons are shared between atoms
B. When protons are shared between
C. When neutrons are shared between atoms
Answer:
a
Explanation:
the bond is shared between the atoms because whith out it you cant have one
