Answer:
H2(hydrogen gas)
Explanation:
The reaction between magnesium and hydrochloric acid combine to form a salt (magnesium chloride) and release gas (hydrogen).
A sample of gas is at a pressure of 2.81 atm, 664 K, and a volume of 713 L. What will
be the pressure of the gas if its volume and temperature change to 126 L, and 368 K
respectively?
Answer:
8.81 atm
Explanation:
P1 V1 /T1 = P2 V2 / T2 T must be in Kelvin
re-rrange to :
P1 V1 / T1 * T2/V2 = P2
2.81 * 713 / (664) * 368 /126 = 8.81 atm
The new pressure of the gas given that its volume and temperature change to 126 L and 368 K respectively is 8.81 atm
Data obtained from the question Initial pressure (P₁) = 2.81 atmInitial volume (V₁) = 713 L Initial temperature (T₁) = 664 K New Volume (V₂) = 126 L New temperature (T₂) = 368 KNew pressure (P₂) = ?How to determine the new pressureThe new pressure of the gas can be obtained by using the combined gas equation as illustrated below:
P₁V₁ / T₁ = P₂V₂ / T₂
(2.81 × 713) / 664 = (P₂ × 126) / 368
Cross multiply
664 × 126 × P₂ = 2.81 × 713 × 368
Divide both side by 664 × 126
P₂ = (2.81 × 713 × 368) / (664 × 126)
P₂ = 8.81 atm
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These diagrams show two atoms of fluorine and an atom of magnesium.
On the left, a purple circle labeled F is shown twice, both times surrounded by 2 concentric circles. The inner circle has 2 small green spheres. The outer circle has 7 small green spheres. On the right, a purple circle labeled M g surrounded by 3 concentric circles. The inner circle has 2 small green spheres. The middle circle has 8 small green spheres. The outer circle has 1 small green sphere.
Which shows the correct steps in the formation of an ionic bond between these atoms?
A magnesium atom accepts six electrons from the fluorine atoms → Each fluorine atom donates three of the electrons → The magnesium atom becomes a -2 ion → Each fluorine atom becomes a +1 ion
A magnesium atom donates two electrons to the fluorine atoms → Each fluorine atom accepts one of the electrons → The magnesium atom becomes a -2 ion → Each fluorine atom becomes a +1 ion
A magnesium atom accepts two electrons from the fluorine atoms → Each fluorine atom donates one of the electrons → The magnesium atom becomes a -2 ion → Each fluorine atom becomes a +1 ion
A magnesium atom donates two electrons to the fluorine atoms → Each fluorine atom accepts one of the electrons → The magnesium atom becomes a +2 ion → Each fluorine atom becomes a -1 ion
The magnesium atom looses two electrons which are accepted by each of the fluorine atoms. (Option D).
What is an ionic bond?An ionic bond is formed when two ions are formed by the loss or gain electrons. In this case, magnesium has to loose two electrons while fluorine will gain two electrons.
Thus, the correct steps in the formation of an ionic bond between these atoms are A magnesium atom donates two electrons to the fluorine atoms → Each fluorine atom accepts one of the electrons → The magnesium atom becomes a +2 ion → Each fluorine atom becomes a -1 ion (Option D).
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. Does the combustion reaction mentioned follow the model of the
combustion reactions?
. What do you think about the possibility of either ethanol or methanol to
fuel vehicles?
Do you or anyone in your family own a hybrid vehicle?
Do you have any other experience with a hybrid vehicle?
. As the technology improves, and the price comes down, do you think you
will be interested in purchasing an alternative fuel vehicle?
.
.
.
What role do you believe the government should play in influencing
consumers to purchase hybrid vehicles (should it be mandated, should tax
credits be offered, etc.)?
The combustion reaction mentioned follow the model of the combustion reactions as illustrated in the information about the hybrid vehicles.
How to explain hybrid vehicle?It should be noted that the comparison between the decrease in HC emissions and the blended fuels shows that methanol is more effective than ethanol.
The lowest emissions are obtained with methanol-blended fuel. When more combustion is complete, it will result in lower emissions.
Anyone in my family do not own a hybrid vehicle and I didn't have any other experience with a hybrid vehicle. Hybrid electric vehicles are powered by an internal combustion engine and one or more electric motors, that uses energy stored in batteries.
A hybrid electric vehicle cannot be plugged in to charge the battery but rather, the battery is charged through regenerative braking and by the internal combustion engine.
When the technology improves, and the price comes down, I will be interested in purchasing an alternative fuel vehicle.
The government should play in influencing consumers to purchase hybrid vehicles by offering tax credits and giving incentives.
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A boy wants to throw a can straight up and then hit it with a second can. He wants the
collision to occur 4.0 m above the throwing point. In addition, he knows that the time
he needs between throws is 3.0 s. Assuming he throws both cans with the same speed,
What must the initial speed be?
The initial speed of the boy's thrown is determined as 16.03 m/s.
Initial speed of the boy's throwThe initial speed of the throw is calculated as follows;
h = vt - ¹/₂gt²
4 = 3t - (0.5)(9.8)(3)²
4 = 3t - 44.1
3t = 48.1
t = 48.1/3
t = 16.03 m/s
Thus, the initial speed of the boy's thrown is determined as 16.03 m/s.
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What is the balanced equation of
H2 + Cl2 —-> HCl
Answer:
The balanced equation of H2 + Cl2 —-> HCl is 2H2 + 2Cl2 —-> 2HCl.
Explanation:
In a chemical reaction, the number of atoms of each element must be the same on both sides of the equation. In this case, there are two atoms of hydrogen on the left side and two atoms of chlorine. On the right side, there is one atom of hydrogen and one atom of chlorine. In order to balance the equation, we must add another chlorine atom to the right side so that there are two atoms of chlorine on both sides of the equation. The final balanced equation is 2H2 + 2Cl2 —-> 2HCl.
H2O2+CLO2====CLO-2+O2. Balance the equation using half reaction
Answer:
I have the explanation.
Explanation:
What is the change in temperature if 500 J of heat are added to a 23 g sample of silver? (Thespecific heat of silver is 0.24 J/g °C)
The change in temperature (∆T) if 500 J of heat are added to a 23 g sample of silver is calculated to be 90.58°C.
How to calculate change in temperature?The change in temperature of a substance can be calculated using the following formula:
Q = mc∆T
Where;
Q = quantity of heat absorbed or releasedm = mass of substancec = specific heat capacity∆T = change in temperature500 = 23 × 0.24 × ∆T
500 = 5.52∆T
∆T = 500/5.52
∆T = 90.58°C
Therefore, the change in temperature (∆T) if 500 J of heat are added to a 23 g sample of silver is calculated to be 90.58°C.
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A flask contains 0.545 mol of liquid bromine, Br2. Determine the grams of bromine molecules present in the flask.
Answer:
when asking this question they are looking for the number of Br2 therefore .5 mol
.5*6.022*1023 molecules which equals 3.011*1023 molecules
Explanation:
Its correct
Molar mass of Br_2=160g/mol
No of moles=0.545
Mass
moles×Molar mass0.545(160)87.2gWhat is the molecular geometry of H2O?
A. Bent
B. Tetrahedral
C. Trifocals pyramid
D. Linear
Answer:
b option
Explanation:
H2O has a tetrahedral arrangement of molecules or an angular geometry. This is mainly because the repulsion from the lone pair combination is more than bond-pair repulsion.
Question 10
A) True.
Sara's resting heart rate is 70 bpm. She goes for a run. Within one-minute post exercise, her heart rate is 100 bpm. Sara has
achieved homeostasis.
B) False.
Additional content
3 OF 10 QUESTIONS REMAINING
You can add text, images, and files here.
2 Points
False. Sarah has not achieved homeostasis.
What is homeostasis?It is the maintenance of a relatively unchanged internal process in the body of organisms.
Since the resting heart rate for Sarah is 70 bpm, a 100 bpm is a far cry from the normal resting heart rate.
Thus, it cannot be said that Sarah has achieved homeostasis.
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Samantha wants her team however she needs to make a decision to feel excited about compounding a new medication
Samantha wanting her team however she needs to make a decision to feel excited about compounding a new medication is ideal.
What is Medication compounding?This is the process of changing or mixing ingredients in order to suit the needs of an individual.
This technique should be best employed so as to ensure prompt and accurate treatment of her illness.
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Compare the structural features of these two possible bonding arrangements for OSF4 and use this information to determine the most likely structure.
Drag each item to the appropriate bin
The possible structure of the compound is structure 2.
What is the most appropriate structure?The full question is shown in the image attached to this question. Now we know that the central atom is sulfur and there are five regions of electron density around the central atom.
Now, we know that the structure is based on a trigonal bipyramid. Let the structure at the RHS be structure 1 and the structure at the LHS be structure 2.
For structure 1;
Oxygen is in axial positionThree ≈90 degree F-S-F bondsOne ≈120 degree F-S-F bondFor structure 2;
Oxygen is in equatorial positionFour ≈90 degree F-S-F bondsHence, the possible structure of the compound is structure 2.
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what is the frequency of a wavelength if its wavelength is 3.6 x 10^-9m and its velocity is 3.o x 10^8 m/s
Answer:
Frequency of the wave = 8.33 × 10¹⁶ Hz
Explanation:
• We can use the wave equation to solve this problem:
v = f λ
where:
v = velocity of wave (3.0 × 10⁸ m/s)
f = frequency of wave (?)
λ = wavelength of wave (3.6 × 10⁻⁹ m)
• Substituting these values into the equation:
3.0 × 10⁸ = f × 3.6 × 10⁻⁹
f = (3.0 × 10⁸) ÷ (3.6 × 10⁻⁹)
f = 8.33 × 10¹⁶ Hz
the identities of substances are the same before and after which type of change
Answer:
change of state
Explanation:
Change of state .... like ice changing state to water ....or water chaging state to steam
(9) An element which is used to observe the physical property brittlness
1.Magnesium. 2.Copper
3.Aluminum. 4.Sulphur
Assume that matter does not consist of atoms. Show by example how this assumption leads to
hypothetical predictions which contradict the Law of Multiple Proportions. Do these hypothetical
examples contradict the Law of Definite Proportions? Are both observations required for
confirmation of the atomic theory?
If matter was not composed of atoms, the law definite proportions and law of multiple proportions will not hold true because compound would have random composition.
What is the law of definite proportions and law of multiple proportions?The law of definite proportions states that all pure samples of a compound contains the same element in a fixed mass ratio.
The law of multiple proportions states that if an element combines with another element to form more than one compound, the mass of the element combines with a fixed mass of the other element in whole number multiples ratios.
Assuming matter was not composed of atoms, the law definite proportions and law of multiple proportions will not hold true because, their will be no definite ratio or composition in compounds.
The law definite proportions and law of multiple proportions are required for the atomic theory as they help prove that matter consists of definite unique particles called atoms.
In conclusion, the existence of atoms is proved true by the law definite proportions and law of multiple proportions.
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A 3.00 L flexible container holds a sample of hydrogen gas at 153 kPa.
The pressure increases to 304 kPaand the temperature remains constant.
What will the volume be?
0.66 L
1.51 L
2.26 L
4.50 L
The volume of the flexible container that holds a sample of hydrogen gas at 153 kPa is 1.51L (option B).
How to calculate volume?The volume of a substance can be calculated using the following formula:
P1V1 = P2V2
Where;
P1 = initial pressureP2 = final pressureV1 = initial volumeV2 = final volume153 × 3 = 304 × V2
459 = 304V2
V2 = 459/304
V2 = 1.51L
Therefore, the volume of the flexible container that holds a sample of hydrogen gas at 153 kPa is 1.51L.
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20. What happens to the wavelength of a wave if the frequency is increased?
A wavelength's frequency and energy (E) drop as it becomes longer. You may conclude from these equations that the wavelength grows shorter as the frequency rises. The wavelength lengthens as the frequency drops.
Since frequency and wavelength are inversely related to one another, the wavelength of the wave falls as frequency increases.
5. When. 0.333g of a particular molecular compound dissolves in 33.3 grams of benzene, the freezing point was observed to drop by 0.485 °C. (In actual practice this is absurdly precise for a temperature measurement, but it makes the problem easier to solve.) What is the molecular weight of the molecular compound?
The molecular weight of the molecular compound is
x= 105.57 g/mol
What is the molecular weight of the molecular compound?Generally,a the equation for Mole of molecular compound is mathematically given as
Mm= mass / molar mass
Therefore
Mm= 0.333 g / x
the equation for Morality
M = mole of solute / mass of solvent
[tex]M = \frac{(0.333 g / x )}{33.3 g / 1000 }[/tex]
M= 10 / x
the equation for change in temp dt
dt= K* morality
Therefore
[tex]0.485 = \frac{5.12}{ * 10/ x}[/tex]
x = (5.12 *10) / 0.485
x = 105.57 g/mol
In conclusion, molecular mass of molecular compound
x= 105.57 g/mol
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When magnesium chloride (MgCl2) dissolves in water, it dissociates into magnesium ions and chloride ions. How many moles of ions form when a 42.66-gram sample of magnesium chloride is dissolved in water?
A.0.448 mol
B.0.714 mol
C.1.34 mol
D.2.14 mol
0.448 moles of ions will form when a 42.66-gram sample of magnesium chloride is dissolved in water (option A).
How to calculate number of moles?According to this question, when magnesium chloride (MgCl2) dissolves in water, it dissociates into magnesium ions and chloride ions as follows:
MgCl2(aq) ⟶ Mg2+(aq) + Cl−(aq)
However, if a 42.66-gram sample of magnesium chloride is dissolved in water, this means that 42.66g/molecular mass of MgCl2 will be the number of moles of the ionic products.
molecular mass of MgCl2 = 95.3g/mol
moles = 42.66g ÷ 95.3g/mol = 0.448mol
Therefore, 0.448 moles of ions will form when a 42.66-gram sample of magnesium chloride is dissolved in water.
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Calculate the volume(in L), at STP, of carbon dioxide produced by the complete combustion of 6.75 lbs of charcoal.
C(s) + O2(g) ⇒CO2(g)
535.8 L volume(in L), at STP, of carbon dioxide produced by the complete combustion of 6.75 lbs of charcoal.
What is an ideal gas equation?The ideal gas law (PV = nRT) relates the macroscopic properties of ideal gases. An ideal gas is a gas in which the particles (a) do not attract or repel one another and (b) take up no space (have no volume).
Given:
[tex]C(s) + O_2(g)[/tex] ⇒[tex]CO_2(g)[/tex]
1 mole of [tex]CO_2(g)[/tex] is formed from 1 mole of charcoal, that means 1 mole of [tex]CO_2(g)[/tex] is formed from 12 g of charcoal.
1 lbs = 453.592 grams
6.75 lbs = 6.75 x 453.592 =3061.746g
So, [tex]CO_2(g)[/tex] formed from 3061.746g of charcoal is:
=[tex]\frac{1}{12}[/tex] x 3061.746g
=255.14 mol.
Now, at STP, the volume of 1 mol of gas =22.4 L
Volume of 255.14 mol of [tex]CO_2(g)[/tex] = 255.14 x 22.4 L
Volume of 255.14 mol of [tex]CO_2(g)[/tex] = 535.8 L
Hence, 535.8 L volume(in L), at STP, of carbon dioxide produced by the complete combustion of 6.75 lbs of charcoal.
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A compound has a molecular mass of 98.1861 g per mol. Its empirical formula is CH2. Determine its molecular formula.
Empirical formula mass
12+214g/molFind n
Molecular mass/Empirical mass98.1861/147Molecular formula
n×Empirical formula7(CH2)C_7H_14The molecular formula of the compound is C₇H₁₄.
What is the relationship between empirical formula and molecular formula?The empirical formula of a compound and the molecular formula is related as follows:
Molecular formula = n x empirical formulaThe empirical mass of the compound = 12 + 4 = 14
n = molecular mass/empirical mass
n = 98.1861/14 = 7
molecular formula will be n(CH2) = C₇H₁₄
In conclusion, the molecular formula is determined from the molecular mass and empirical mass.
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for which electrode could you use an inactive material
Mercury and carbon two electrodes can't be used with an inactive or inert material.
What is an electrode?The electrode is the element which is used to complete the electric circuit in welding. Some time electrode is connected with the positive terminal and sometimes with a negative terminal, it depends on the requirement of the welding process.
Inert electrode is an electrode that serves only as a source or sink for electrons without playing a chemical role in the electrode reaction. Precious metals, mercury, and carbon are typically used as inert electrodes.
Therefore, neither of the two electrodes can be used with an inactive or inert material.
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A(n). Is an electrically charged atom
An ion is an electrically charged atom. Details about ions can be found below.
What is an ion?Ion in chemistry refers to an atom or group of atoms bearing an electrical charge.
An example is the sodium (Na+) and chlorine (Cl-) atoms in a salt solution.
Therefore, it can be said that an ion is an electrically charged atom.
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Select the option no explanation needed
Answer:
70.9 g/mol
Explanation:
To find the molar mass, you first need to convert molecules to moles via Avogadro's Number.
Avogadro's Number:
6.022 x 10²³ molecules = 1 mole
2.123 x 10²¹ molecules X₂ 1 mole
-------------------------------------- x ------------------------------------ = 0.00353 moles X₂
6.022 x 10²³ molecules
Now, you can plug the molar value and mass (given) into the molar mass ratio to find your final answer. Your answer should have 3 sig figs to reflect the given value with the lowest amount of sig figs (0.250 g).
Molar Mass (g/mol) = mass (g) / moles
Molar Mass = 0.250 g / 0.00353 moles
Molar Mass = 70.9 g/mol
Amol has divided some substances into two groups as shown in the table below. He wants to further separate all the substances in Group 1 again into exactly two groups. Which of the following criteria will allow him to do so?
A. liquids and solids
B. mixtures and pure substances
C. naturally occurring and man-made substances.
D. substances completely soluble and insoluble in water.
The criteria that will allow Amol separate group 1 substances into two groups are mixtures and pure substances (option B).
What are mixtures and pure substances?Mixtures are substances that are made up of two or more substances that can be easily separated.
Pure substances, on the other hand, are elements and compounds that cannot be separated by chemical means.
In group 1 of the above table, the substances can be classified as follows:
Soil - mixtureTomato ketchup - mixtureSmoke - compoundMilk - mixtureHair shampoo - mixtureTherefore, the criteria that will allow Amol separate group 1 substances into two groups are mixtures and pure substances.
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Answer:
Explanation:
b is the right answer
What factors are responsible for Exceptions to the 18 electron rule in organometallic compounds
Answer:
What is 18 electron rule?
:- The 18-electron rule is a chemical rule of thumb used primarily for predicting and rationalizing formulas for stable transition metal complexes, especially organometallic compounds.
Explanation:
A few common examples of exceptions to 18 electron rules include: 16-electron complexes: The metal center is usually low-spin and is in d8 configuration. These complexes adopt square planar structure, such as Rh(I), Ni(II), Pd(II), and Pt(II) complexes.
Hope its helpful!
Answer:
What is 18 electron rule?
:- The 18-electron rule is a chemical rule of thumb used primarily for predicting and rationalizing formulas for stable transition metal complexes, especially organometallic compounds.
Explanation:
A few common examples of exceptions to 18 electron rules include: 16-electron complexes: The metal center is usually low-spin and is in d8 configuration. These complexes adopt square planar structure, such as Rh(I), Ni(II), Pd(II), and Pt(II) complexes.
Explanation:
Arterial blood contains about 0.25 g of oxygen per liter at 37°C and standard atmospheric pressure. Under these conditions, the Henry's law constant is kH = 3.7 × 10^–2 mol/(L • atm), and the mole fraction of O2 in the atmosphere is 0.209
Calculate the solubility (in M) of O2 in the blood of a scuba diver at a depth of 100 feet, where Patm = ~3 atm
_______ M
The solubility (in M) of O2 in the blood of a scuba diver at a depth of 100 feet is 2.32 × 10^-3 mol.
How to calculate the solubility?It should be noted that the partial pressure of oxygen will be:
= Mole fraction × Total pressure
= 0.209 × 3
= 0.627
According to Henry's law, the solubility will be:
= 3.7 × 10^-2 × 0.627
= 2.32 × 10^-3 mol
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Given: t = 8.5 minutes, A = 1.50 for electroplating copper from copper (II);
what is the mass copper plated on to the key?
13 V
3 A
4V
3V
R=?
Calculate the resistance measured across the second light bulb.
Net potential
13V+4V+3V20VNet current=3A
Apply ohm's law
R=V/IR=20/3R=6.67Ohm