Answers
Answer:
the net force which is a vector sum
Explanation:
The net force is the vector sum of all the forces
That is, the net force is the resultant of all the forces
The vector sum of all the forces is called as the net force. In other words, the net force is the sum of all forces. Thus, option A is correct.
What is the sum of all forces acting on an object?The mass times the acceleration equals the sum of the forces. According to the second law, the acceleration is equal to zero if the object or system is not moving. As a result, the vector forces' sum must be zero.
The net force is the result of the vector sum of all the forces acting on a body. The item is considered to be in equilibrium if the net force is equal to zero.
The process of adding two or more vectors together to create a vector sum is known as vector addition. The so-called parallelogram law lays forth the guidelines for adding two or more vectors together.
By aligning the two vectors and head to tail and drawing the vector from the free tail to the free head, the vector total for the pair and may be calculated.
Therefore, vector sum best describes the sum of all forces acting on an object.
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Related Questions
Aqueous solution of two salts Na2CO3 and Na2SO4 is given. How to prove the simultaneous occurrence of both carbonate and sulphate anions?
Answers
Answer:
See the answer below.
Explanation:
If an aqueous solution of two salts contains both Na2CO3 and Na2SO4, the following steps will prove the occurrence of both carbonate and sulphate ions:
1. Add a dilute acid (such as HCl) to the solution. The presence of carbonate ion will result in the release of carbon dioxide gas which will be shown by formation of effervescent bubbles. The gas can be proven to be carbon dioxide by channeling it into a lime water which usually turns milky with the presence of the gas.
\(CO^{2-}_3(aq) + 2H^+(aq) ==> H_2O(l) + CO_2(g)\)
2. Add barium chloride to an acidified portion of the aqueous solution. The presence of sulphate ion will be indicated by the formation of white barium sulphate precipitate. Initial acidification is done to disperse off any carbonate ion that might be present in the solution and give a false-positive white precipitate result.
\(Ba^{2+}(aq) + SO^{2-}_4(aq) --> BaSO_4(s)\)
if the body is moving with uniform acceleration then, eng of motion are given as s = u+v/2+t
Answers
Yes, s = u+v/2+t, where s is the displacement, u is the beginning velocity, v is the end velocity, and t is the time required, is the equation of motion for a body travelling with uniform acceleration.
The basic law of motion, which states that a body's rate of change in displacement is directly proportional to its velocity, provides the basis for this equation. The equation of motion for a body travelling with constant acceleration, s = ut + 1/2at2, may be used to derive it.
The equation of motion for a body travelling with uniform acceleration is given by replacing the value of an as (v-u)/t and getting s = u+v/2+t. This formula is only accurate when the body's acceleration is constant and uniform.
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How do you prepare a solution of sugar 342g/mol. 0.45 in 50ml
Answers
0.01 mol/L is the molarity of given solution. 0.002 moles is added to 0.2 L solvent to make desired solution.
The amount of moles of solute found in a specific number of litres of the solution, or moles per litre of a solution, is known as molar concentration or molarity. Solutes are simply substances that can be found in solutions because a solution is defined as a homogenous mixture that comprises one or more solutes.
molar mass =342g /mol
number of moles=mass of solute / molar mass
0.45 /342 =0.002 moles
Volume solution = 50 mL / 1000 =0.2 L
M = n / V
M = 0.002 / 0.2
M = 0.01 mol/L
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Help plz now !
Which statement explains why a chemical equation must be balanced?
A. It must show the reactants and products on the correct sides of
the reaction arrow.
B. It must show that the mass of each element involved is conserved
by a chemical reaction.
C. It must show how each chemical formula is written to accurately
represent each substance.
D. It must show that coefficients and subscripts can be used in
chemical formulas.
Answers
Answer: B. It must show that the mass of each element involved is conserved by a chemical reaction.
Explanation:
According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.
The correct statement why a chemical equation must be balanced is It must show that the mass of each element involved is conserved by a chemical reaction.
Answer:
B. It must show that the mass of each element involved is conserved
by a chemical reaction.
Explanation:
a p e x, just took the quiz
It is not safe to put an aerosol canister in a campfire, because the pressure Inside the can gets very
high at the temperature rises....it can explode! If you have a 1500 milliliter canister that holds 3 moles
of gas, and the campfire temperature reaches 1500 °C, what is the pressure in atmospheres inside the
canister?

Answers
The pressure inside the canister at a campfire temperature of 1500°C is 0.227 atm
Given that the temperature of the campfire is 1500°C, the volume of the aerosol canister is 1500 milliliters, and the number of moles of gas in the canister is 3 moles.The ideal gas equation is given as PV = nRT, where P is pressure, V is volume, n is the number of moles of gas, R is the ideal gas constant, and T is the absolute temperature of the gas in Kelvin.To convert 1500°C to Kelvin, we use the equation: T(K) = T(°C) + 273T(K) = 1500 + 273T(K) = 1773 KSubstitute the values given in the ideal gas equation:P = (nRT) / VWe are given n, R, V, and T, hence we substitute and solve for P as follows:P = (3 × 0.082 × 1773) / 1500P = 0.227 atm.It is not safe to put an aerosol canister in a campfire because the pressure inside the canister will increase at higher temperatures. If the pressure in the canister continues to increase beyond the safe limit, it can explode. Therefore, always keep aerosol canisters away from sources of high temperatures.
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What is the mass percentage of C in morphine, C₁7H19NOs? Provide an
answer to two decimal places.
Answers
The mass percentage of C in morphine would be 4.21%.
What is mass percentage?The mass percentage of a composition in a compound is the mass of the composition relative to the mass of the entire compound. This can be mathematically expressed as:
Mass percentage = mass of component/mass of substance x 100%
In this case, we are looking for the mass percentage of C in \(C_{17}H_{19}NO_3\).
Molar weight of C = 12 g/mol
Molar mass of \(C_{17}H_{19}NO_3\) = (12x17) + (1x19) + (14x1) + (16x3)
= 285 g/mol
Mass percentage of C = 12/285
= 4.21% to 2 decimal places.
In other words, the mass percentage of C in morphine is 4.21%.
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As wind blows up the windward side, sand grains may be picked up and blown toward the top. Then grains may drop, allowing them to slip down the leeward side. What event is this describing?
1: Desertfication
2: Deposition
3: Dune movement
4: Drought of farmlands
Answers
The event described when wind blows up the windward side, sand grains may be picked up and blown toward the top is Dune movement.
What is Dune movement?
The sand mass of dunes can move either windward or leeward, depending on if the wind is making contact with the dune from below or above its apogee.
If wind hits from above, the sand particles move leeward; the leeward flux of sand is greater than the windward flux.
Thus, the event described when wind blows up the windward side, sand grains may be picked up and blown toward the top is Dune movement.
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How many moles of H2SO4 are required to completely react with 7.20 mol of Al according to the balanced chemical reaction: 2Al(s) +3H2SO4(aq) → Al2(SO4)3(aq) +3H2(g)
Answers
10.8
7.2mol*3/2=10.8mol.
10.8 moles of H₂SO₄ is required for the reaction.
The balanced equation for the reaction is given below:
2Al + 3H₂SO₄ —> Al₂(SO₄)₃ + 3H₂From the balanced equation above,
2 moles of Al required 3 moles of H₂SO₄.
Finally, we shall determine the number of mole of H₂SO₄ required to react with 7.20 moles of Al.
This can be obtained as follow:
From the balanced equation above,
2 moles of Al required 3 moles of H₂SO₄.
Therefore,
7.20 moles of Al will require = \(\frac{7.2 X 3}{2} \\\\\) = 10.8 moles of H₂SO₄
Thus, 10.8 moles of H₂SO₄ is required for the reaction.
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When two hydrogen atoms approach each other to form a chemical bond, different interactions occur between the atoms. Identify the correct statements with respect to the interactions involved in the formation of chemical bond. Check all that apply. View Available Hint(s)for Part A When two hydrogen atoms approach each other to form a chemical bond, different interactions occur between the atoms. Identify the correct statements with respect to the interactions involved in the formation of chemical bond.Check all that apply. When two atoms of H approach each other, the two nuclei repel each other. When two atoms of H are infinitely far apart, they show attractive interactions. When two atoms of H approach each other, the electrons attract each other. When two atoms of H approach each other, each electron is attracted by the other nucleus. When two atoms of H approach each other, each electron repels the other nucleus.
Answers
H atoms communicate attractively even when they are infinitely apart. Each electron is drawn to the other centre as two H atoms get close to one another. The electrons of two H atoms draw one another when they come close to one another.
Do two H atoms exhibit attractive interactions when they are indefinitely separated from one another?When two atoms of H come close to one another, one electron of each atom repels one nucleus while the other nucleus attracts the other electron. H atoms communicate attractively even when they are infinitely apart.
What transpires if two hydrogen ions are separated greatly?They cannot make a covalent bond if they are too far apart because their individual 1s orbitals cannot overlap; instead, they remain as two separate objects.
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What type of covalent bond in Br₂?
O A double bond because they share 4 electrons.
O A double bond because they share 2 electrons.
OA single bond because they share 2 electrons.
OA single bond because they share 1 electron
Answers
Answer: A single bond because they share 2 electrons
Explanation:
Question 5 of 10
Platinum has a density of 21 g/cm³. A platinum ring is placed in a graduated
cylinder that contains water. The water level rises from 4.0 mL to 4.2 mL
when the ring is added. What is the mass of the ring?
A. 2.6 g
OB. 3.8 g
OC. 4.2 g
OD. 5.2 g
B
Answers
Answer:
4.2 g
Explanation:
The VOLUME of the ring is 4.2 - 4.0 = .2 ml = .2 cm^3
the MASS of the ring is this times the density
.2 cm^3 * 21 g/cm^3 = 4.2 g
Answer:
the answer is c
Explanation:
density is mass/volume
so mass=density × volume
but we take the change is volume that is v2-v2=4.2-4=0.2ml
but the density is in gm/cm^3 so we should convert ml into cm^3. eventually they are equal so mass=21×0.2=4.2
I need some help with this. If you don't know it; don't answer it. I will report if, its not clear on how you got the answer.
Answers
40/(Fe+2cr+40)D)
4.What volume of hydrogen gas at STP is produced when 2.5 grams of zinc react with an
excess of hydrochloric acid?
Answers
Answer:
0.86
Explanation:
1mol of Zn has mass of 65.39g.The amount of Zn is 2.5g65.39g/mol=0.038mol.
The amount of H2 produced is the same as the amount of Zn consumed (0.038mol).
1mol of ideal gas will occupy 22.4L at STP.
The H2 will occupy 0.038mol×22.4L/mol=0.86L
.
If an atom has 10 protons and electrons how many of the electrons will be valence electrons?
Answers
Answer:
8 of the electrons will be valence electrons
Explanation:
Answer:
8 valence electrons
Explanation:
We are given the atom has 10 electrons.
The first electron shell holds 2 electrons (maximum)
The second electron shell holds 8 electrons (maximum)
2+8=10
Therefore we would have 2 electrons in the first shell and 8 in the second.
Valence electrons are the outermost electron, and since the second shell is the outermost for the atom, it has 8 valence electrons.
Becca is a forensic technician analyzing the fragments of a window. She sees that there is a hole in the window, and that the outside hole is smaller than the inside hole. What might she deduce from this information?
Answers
The observation of a smaller outside hole than inside leads Becca to infer that an impact from the outside caused the hole, with a larger object striking and passing through the window from the inside.
From the observation that the hole in the window is smaller on the outside than on the inside, Becca, as a forensic technician, might deduce the following:
The hole was caused by an impact from the outside: The smaller outside hole suggests that the force that created the hole originated from the outside and exerted more pressure on the window surface facing inward.
The object causing the hole was larger on the inside: The discrepancy in hole sizes implies that the object that struck the window had a larger size or diameter on the inside, and as it penetrated the glass, it compressed or fragmented the glass, resulting in a larger hole on the inside.
The object may have passed through the window: The difference in hole sizes indicates that the object may have penetrated the window, potentially passing through to the inside. This could suggest a break-in or an incident involving the window being struck from the outside.
Overall, the observation of a smaller outside hole than inside leads Becca to infer that an impact from the outside caused the hole, with a larger object striking and passing through the window from the inside.
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Do you agree that heat can do work by constructing a model? Explain
Answers
Work can be totally transformed into heat (for example, by friction), whereas heat can only be partially converted into work.
What is a model?A model is a depiction of something that is frequently too difficult to directly observe or display. Although experimental testing validates a model, it is only accurate in explaining specific characteristics of a physical system.
Work is defined as the transfer of energy to or from a system by any means other than heat.
A transfer of energy to or from a system by any means other than heat is called “work”. Work can be completely converted into heat (by friction, for example), but heat can only be partially converted to work. The Second Law of Thermodynamics, states that the complete conversion of heat into work is impossible.
Heat transmission in materials can be described using the kinetic particle model. Heat energy always travels from a high-temperature zone to a low-temperature region.
Thus, heat can do work by constructing a model.
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Why do we calculate kc for chemistry
Answers
Explanation:Kc is the equilibrium constant for a chemical reaction at a specific temperature in terms of the equilibrium concentrations of the reactants and products and the stoichiometric coefficients. The next section will use two examples to show how to calculate Kc from concentrations.
3.833 kJ of heat is required to convert a 36.8 g sample of ethyl
alcohol from the solid to liquid phase. What is the heat of
fusion of ethyl alcohol in J/g?
Answers
The heat of fusion of the given sample of the ethyl alcohol is 104.16 J/g.
The given parameters:
heat required to convert 36.8 g sample of ethyl alcohol, Q = 3.3833 kJmass of the ethyl alcohol, m = 36.8 gThe heat of fusion of the given sample of the ethyl alcohol converted from solid to liquid phase is calculated as follows;
\(H_f = \frac{Q}{m} \\\\H_f = \frac{3.833 \times 10^3\ J}{36.8 \ g} \\\\H_f = 104.16 \ J/g\)
Thus, the heat of fusion of the given sample of the ethyl alcohol is 104.16 J/g.
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In which of the following compounds does iron have the lowest oxidation number?
A. All are equal
B. Fe(OH)2
C. Fe(OH)3
D. FeOH
Answers
Answer:
C is the Answer
Follow me please
Mark brainliest
Compounds are formed by the same or the different molecules of the elements. Iron has the lowest oxidation number in FeOH. Thus, option D is correct.
What is the oxidation number?The oxidation number is the total gain or loss of the electrons by the atom to form a chemical bond with another atom in a molecule or a compound.
The oxidation state in a neutral compound adds up to zero. The oxidation number of oxygen is -2, and that of hydrogen a monoatomic ion is always +1.
Oxidation states are calculated as,
Fe(OH)₂:
X + 2 (-2 +1 ) = 0
X -2 = 0
X = +2
Fe(OH)₃:
X + 3 (-2 +1 ) = 0
X - 3 = 0
X = + 3
FeOH:
X -2 + 1 = 0
X - 1 = 0
X = +1
Therefore, iron has the lowest oxidation number in FeOH.
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question is in the image.
Answers
The atomic mass of Sulphur is 80.1 amu ≈ 80 amu.
What is an atomic mass?Atomic mass, also known as average mass in a bunch of atoms, is the total mass of the protons, neutrons, and electrons that make up an atom. However, because they are so much lighter than protons and neutrons, electrons are not taken into account in the computation. The mass of protons and neutrons together make up the atomic mass.
What is the sulfur trioxide's atomic mass?The mass of the elements present in the compound determines the percentage composition.
Sulfur mass equals 32.1 amu given
Oxygen mass = 16.0 amu
Sulfur trioxide mass is 32.1 + 3 × 16.0 = 80.1 amu.
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What is Sr(NO3)2 + ZN ?
Answers
Answer:
strontium nitrate
Explanation:
hope this helps you....:)
Which of the following is not true of atoms?
They are extremely small.
O They make up elements.
They can combine with other atoms.
O They are composed of water.
Answers
Answer:
they are composed of water
Answer:
guess its the last one should be right
Explanation:
prove me wrong
What’s a carbohydrate?
A. A hormone
B. A cholesterol molecule
C. An enzyme
D. A sugar molecule
Answers
An unknown compound was found to be soluble in concentrated sulfuric acid; however, the 2,4-DNP, chromic acid, and potassium permanganate gave negative results. The only positive result detected was the ferrous hydroxide test. What is the most likely functional group present in such compound
Answers
Explanation:
2,4-DNP is negative: aldehyde and ketone absent
Chromic acid is negative: alcohol absent.
KMnO4 test negative: alkene absent
The only positive result is for Fe(OH)2.
Nitro group-containing compounds react with ferrous hydroxide to give amine and ferric hydroxide red ppt. Hence given compound contains the nitro group (-NO2).
an electron in the 3rd shell of an Aluminium atom moves to the first shell in a bombardment process. Calculate the frequency of the electron the 3rd orbit and energy used in transition to the first shell.[h=6.626*10^-14J/Hz [R=3.29*10^15 Hz]
Answers
Following the quantic theory, the energy of a photon equals the radiation frequency multiplied by the universal constant. ν = 2.923x10¹⁵ Hz. E = 3.09x10¹⁵Hz.
What is quantum mechanic?It is the branch of physics that studies objects and forces at a very low scale, at atoms, subatoms, and particles levels.
Quantum mechanics states that the elemental particles that constitute matter -electrons, neutrons, protons- have the properties of a wave and a particle.
It emerges from the quantic theory exposed by Max Planck (1922), in which he affirmed that light propagates in energy packages or photons.
He discovered the Universal Planck constant, h, used to calculate the energy of a photon.
He stated that the energy of a photon (E) equals the radiation frequency (ν) multiplied by the universal constant (h).
E = νh
In the exposed example, we need to calculate the energy required to change from the 3rd shell to the first shell.
To do it, we should know that the energy in a level (Eₙ) equals the energy associated to an electron in the most inferior energy level (E₁) divided by the square of the shell number (n²).
Eₙ = E₁ / n²
E₁ is a constant. We can express it in Joules or electroVolts
E₁ = -2.18x10⁻¹⁸ JE₁ = -13.6 eVSo, let us calculate the energy at level 1 and 3
Eₙ = E₁ / n²
E₁ = -2.18x10⁻¹⁸ J / 1² = -2.18x10⁻¹⁸ JE₁ = -13.6 eV / 1² = -13.6 eV
E₃ = -2.18x10⁻¹⁸ J / 3² = -2.18x10⁻¹⁸ J / 9 = - 2.42x10⁻¹⁹ JE₃ = -13.6 eV / 3² = -13.6 eV / 9 = - 1.51 eV
The change of energy can be calculated in two ways,
Option 1
ΔE = E₁ - E₃ = 2.18x10⁻¹⁸ - 2.42x10⁻¹⁹ = 1.93x10⁻¹⁸J
ΔE = E₁ - E₃ = 13.6 - 1.51 = 12.09 eV
Option 2
ΔE = -2.18x10⁻¹⁸ J (1/nf² - 1/ni²)
ΔE =-13.6 eV (1/nf² - 1/ni²)
Where nf is the final level and ni is the initial level. When the electron passes from its initial level to its final level it is called electronic transition.
ni = 3nf = 1ΔE = -2.18x10⁻¹⁸ J (1/nf² - 1/ni²)
ΔE = -2.18x10⁻¹⁸ J (1/1² - 1/3²)
ΔE = -2.18x10⁻¹⁸ J (1 - 0.111)
ΔE = -2.18x10⁻¹⁸ J (0.888)
ΔE = - 1.937x10⁻¹⁸ J
or
ΔE = -13.6 eV (1/nf² - 1/ni²)
ΔE = -13.6 eV (1/1² - 1/3²)
ΔE = -13.6 eV (1 - 0.111)
ΔE = -13.6 eV (0.888)
ΔE = -12.08 eV
This is the energy required for the electron to go from n= 3 to n = 1. The negative sign (-) means energy (as light or photons) released or emitted.
If we want to express the result in Hz, we just need to make a conversion.
1Hz ⇔ 6.626x10⁻³⁴J ⇔ 4.136x10¹⁵ eV.
The energy required for the electron to go from n= 3 to n = 1 is 3.09x10¹⁵ Hz.
Now, we need to calculate the frequency, ν. This is, how many times the wave oscillates back and foward per second.
To do it, we will use the universal Planck constant, h, and the absolute value of the energy, E.
ν = E/h = 1.937x10⁻¹⁸ J / 6.626x10⁻³⁴ Js = 2.923x10¹⁵ 1/s = 2.923x10¹⁵ Hz.
Answer:
Frequency, ν = E/h = 2.923x10¹⁵ Hz.Energy, E = 3.09x10¹⁵ Hz.You can learn more about quantum mechanic at
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Calculate the pH of 500 mL of water to whicha. 20.0 mL of 0.1 M HNO3 has been addedb. 15.0 mL of 1.0 M KOH has been added
Answers
The pH of 500ml of water to which 20ml of 0.1M HNO3 has been added is = 4.8 and The PH of 500ml of water to which 15.0ml of 1.0M KOH has been added is = 10.12
a. The pH of 500 mL of water to which 20.0 mL of 0.1 M HNO3 has been added can be calculated as follows:
First, calculate the volume-to-volume ratio of the HNO3 solution to the water: V_HNO3 / V_water = 20.0 mL / 500 mL = 0.04
Next, calculate the amount of HNO3 added to the water: n_HNO3 = 0.1 M * 20.0 mL * 0.04 = 8.0 x \(10^{5}\) mol
Finally, calculate the new concentration of HNO3 in the solution and use the equation for the pH of a strong acid solution to find the pH: C_HNO3 = n_HNO3 / (V_water + V_HNO3) = 8.0 x \(10^{-5}\)mol / (500 mL + 20.0 mL) = 1.6 x \(10^{-5}\) M pH = -log[H+] = -log(1.6 x \(10^{-5}\)) = 4.8
b. The pH of 500 mL of water to which 15.0 mL of 1.0 M KOH has been added can be calculated as follows:
First, calculate the volume-to-volume ratio of the KOH solution to the water: V_KOH / V_water = 15.0 mL / 500 mL = 0.03
Next, calculate the amount of KOH added to the water: n_KOH = 1.0 M * 15.0 mL * 0.03 = 4.5 x \(10^{-4}\)mol
Finally, calculate the new concentration of OH- in the solution and use the equation for the pH of a strong base solution to find the pH: C_OH- = n_KOH / (V_water + V_KOH) = 4.5 x \(10^{-4}\) mol / (500 mL + 15.0 mL) = 7.5 x \(10^{-5}\) M pH = 14 + log[OH-] = 14 + log(7.5 x\(10^{-5}\)) = 10.12.
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Which of the following reactions best represents the reaction between H3PO4
and water?
A) H3PO4 + H2O ⇌ H2PO4
- + H2O
B) H3PO4 + H2O ⇌ H2PO4
- + H3O+
C) H3PO4 + 3 H2O → PO4 3- + 3 H2O
D) H3PO4 + 3 H2O → PO4 3- + 3 H3O+
Answers
Answer:
Option B, \(H3PO4 + H2O <==> H3O^+ + H2PO4^-\)
Explanation:
In this reaction, a weak acid is reacting with water. Thus, water is this case will act as a proton acceptor or a base as well as an acid. Hence water will be amphiprotic for this chemical process and can donate as well accept as a proton. Now when weak acid such as phosphoric acid loses a hydrogen ion it forms a weak conjugate base ie. H2PO4^-. Water being a weak base shall accept the proton and forms hydronium ion i.e H3O^+
The dihydrogen phosphate ion reacts with water:
H2PO4^- + H2O <----> HPO4^2- + H3O^+
After some time a proton is again transferred to the H2O molecule to produce phosphate ion
HPO4^2- + H2O <----> H3O^+ + PO4^3-
HQ5.40
Homework Answered Due Today, 11:59 PM
The reaction 3H₂(g) + N₂(g) → 2NH3(g) has an enthalpy of reaction of -92.6 kJ/mol. If 1 g of hydrogen and 2 g of nitrogen are
reacted, how much heat is produced (kJ)?
Answers
The amount of heat energy produced when 1 g of hydrogen and 2 g of nitrogen are reacted, is -6.61 KJ
How do i determine the heat energy produced?First, we shall obtain the limiting reactant. Details below:
3H₂ + N₂ -> 2NH₃
Molar mass of N₂ = 28 g/molMass of N₂ from the balanced equation = 1 × 28 = 28 g Molar mass of H₂ = 2 g/molMass of H₂ from the balanced equation = 3 × 2 = 6 gFrom the balanced equation above,
28 g of N₂ reacted with 6 g of H₂
Therefore,
2 g of N₂ will react with = (2 × 6) / 28 = 0.43 g of H₂
We can see that only 0.43 g of H₂ is needed in the reaction.
Thus, the limiting reactant is N₂
Finally, we the amount of heat energy produced. Details below:
3H₂ + N₂ -> 2NH₃ ΔH = -92.6 KJ
Molar mass of N₂ = 28 g/molMass of N₂ from the balanced equation = 1 × 28 = 28 gFrom the balanced equation above,
When 28 grams of N₂ reacted, -92.6 KJ of heat energy were produced.
Therefore,
When 2 grams of N₂ will react to produce = (2 × -92.6) / 28 = -6.61 KJ
Thus the heat energy produced from the reaction is -6.61 KJ
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4. Long answer type questions: a. b. C. d. e. f. g. h. j. i. What are the constituent gases of air? Why is the surrounding air not seen with the eyes? How do you prove that air supports burning? How do you show that air occupies space? How do you prove that air has weight? How is air useful to us? Mention any three points. Write any three properties of air. How can you say that air exerts force? Write any four effects of air pollution. Write any three causes of air pollution and any two control measures of it.
Answers
1. The constituent gases of air are:
Nitrogen Oxygen Argon Carbon Dioxide2. The surrounding air is not seen with the eyes because it is transparent. Air molecules are not visible to the na-ked eye, and they do not scatter or absorb visible light significantly. Therefore, air appears colorless and transparent.
What is air?3. To prove that air supports burning, you can perform an experiment with a burning candle. Place a glass jar or bell jar over a lit candle, ensuring that the jar is airtight. As the candle burns, it consumes oxygen from the air inside the jar. Eventually, the candle flame will go out due to the lack of oxygen, proving that air (specifically oxygen) is necessary for burning.
4. To show that air occupies space, you can perform a simple experiment using a plastic bottle or syringe. Fill the bottle or syringe with water, ensuring there are no air bubbles. Then, cover the opening tightly and try to compress the air inside. You will find that it is not possible to compress the air significantly, indicating that air occupies space.
5. To prove that air has weight, you can use a sensitive balance or scale. Weigh an airtight container or balloon, and then fill it with air. The weight of the container or balloon with the added air will be greater than its initial weight, demonstrating that air has weight.
6. Air is useful to us in various ways. Three points highlighting the importance of air are:
Breathing and RespirationCombustion and Energy ProductionClimate Regulation7. Three properties of air include:
Air is Compressible: Air can be compressed or expanded under different conditions, allowing it to fill various spaces and containers.Air has Mass: Air molecules have mass, which means air itself has weight. It exerts pressure on objects and surfaces.Air Exerts Pressure: Due to the collisions of air molecules with surfaces, air exerts pressure in all directions. This pressure is known as atmospheric pressure.Air exerts force in various ways. For example, air pressure allows objects like airplanes to fly by providing lift. Air resistance or drag opposes the motion of objects moving through the air, creating a force that can affect their speed and trajectory.
8. Four effects of air pollution include:
Respiratory ProblemsEnvironmental Damage:Climate ChangeHuman Health Impacts9. Causes of pollution:
Industrial EmissionsVehicle EmissionsResidential and Agricultural Activities10. Two control measures for air pollution include:
Emission ReductionAir Quality RegulationsLearn more about air on https://brainly.com/question/15215203
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The q of a system that releases 12.4J of heat to surroundings is _____J.
a.) 12.4
b.) -12.4
c.) 0
d.) not enough info
If you explain why I'll give brainly!!
Answers
Answer: B.) -12.4
Explanation: This is because the sign of heat transfer is determined by the system's perspective. In this case, the system is releasing heat to the surroundings, which means that heat is flowing out of the system, making the heat transfer negative. The magnitude of the heat transfer is 12.4 J.