When a practice is sustainable, it means that it can be used over and over through time. Sustainable practices also benefit, rather than harm, the environment. Though it really depends on where you live, the general answer for this would be wind farms since flood irrigation can only happen in certain conditions. Overfishing would destroy a species over time, and clear cutting is obviously harmful to the environment.
The sustainable practice can be described as one that can be seen in A. Wind farms . option A is correct.
What is sustainable practice?It has the capacity to be maintained, upheld, or affirmed. Science of the environment. the property of not being environmentally destructive or depleting natural resources, promoting long-term ecological balance: The committee is creating sustainability criteria for energy-using products.
Sustainable practices promote the health and vitality of the environment, people, and the economy. According to sustainability, resources are limited and should be used prudently with an eye toward long-term goals and the effects of how they are used.
Hence , option A is correct.
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Which human activity will most likely contribute to ozone layer destruction?
Final answer:
The use of aerosol sprays and coolants that release chlorine and bromine gases contributes to ozone layer destruction, leading to increased UV radiation and environmental harm. The Montreal Protocol helped reduce emissions of ozone-depleting substances, slowing the rate of depletion.
Explanation:
The human activity that most likely contributes to ozone layer destruction is the release of chlorine and bromine gases through the use of products like aerosol sprays and coolants. These substances are known as ozone-depleting substances (ODS), and include chemicals such as chlorofluorocarbons (CFCs).
When these substances reach the stratosphere, they release halogen radicals that catalytically destroy ozone molecules, leading to ozone depletion. This has severe environmental and health impacts, such as increased UV radiation leading to higher rates of skin cancers and disrupted ecosystems. The Montreal Protocol was a successful international effort to phase out the production and use of ODS, which has led to a decrease in the rate of ozone depletion, but vigilance and continued reduction of emissions are essential to protect the ozone layer.
if an Element X has the atomic number 35. state the group, period and the orbital in which X belongs on the periodic table
Bromine --> Br: Period 4, Group 17 [Halogen]
How much of a sample remains after five half-lives have occurred?
O 1/5 of the original sample
01/25 of the original sample
O 1/32 of the original sample
O 1/64 of the original sample
Every half-life, we end up with half of the material we started with. At the beginning, we have all of the material, which we can represent with the number 1. After one half-life, we have 1 • 1/2 = 1/2 left.
After two: 1/2 • 1/2 = 1/4
Three: 1/4 • 1/2 = 1/8
Four: 1/8 • 1/2 = 1/16
And five: 1/16 • 1/2 = 1/32.
In general, after n half-lives, we’ll have 1/(2^n) of the material left over.
Answer:
The correct answer is :1 by 32 of the original sample
Explanation:
Formula used :
[tex]A=\frac{A_o}{2^n}[/tex]
where,
A = amount of reactant left after n-half lives = ?
[tex]A_o[/tex] = Initial amount of the reactant = 100 g
n = number of half lives
If five half-lives have occurred.
[tex]A=\frac{A_o}{2^5}[/tex]
[tex]A=\frac{A_o}{32}[/tex]
Hence, the correct answer is :1 by 32 of the original sample
Why is the composition of Earth's atmosphere different from the composition of the atmospheres of Venus and Mars? A. Venus, Mars, and Earth all have similar chemical compositions. B. Earth has life while Venus and Mars do not. C. Venus and Mars have different chemical compositions from Earth. D. Venus and Mars are slightly smaller than Earth.
Earth's atmosphere is unique due to the presence of life that has influenced its composition, unlike the atmospheres of Venus and Mars, which do not support life and have atmospheres dominated by carbon dioxide and lacking in water vapor.So,option B is correct.
The composition of Earth's atmosphere is different from the atmospheres of Venus and Mars primarily because Earth has life, and Venus and Mars do not. This is option B. All three planets started with similar chemicals, but their evolutionary paths diverged because of factors such as their distance from the sun and geological activities. Earth's atmosphere, rich in oxygen and water vapor, not only supports life but has been shaped by it through processes like photosynthesis. In contrast, Venus has a thick atmosphere dominated by carbon dioxide with extreme surface pressure and temperature, making it hot and dry. Mars has a thin atmosphere, also mostly carbon dioxide, and is cold and dry, but it has signs that it once had conditions suitable for life.
The presence or absence of life significantly influences the atmospheric composition. Life on Earth has contributed to the oxygen levels and the presence of water vapor. The lack of life on Venus and Mars means that these planets have been unable to develop the same balance of gases that supports life here on Earth. Consequently, each planet's atmosphere is a result of its unique environmental conditions and history.
A student has 70.5 mL of a 0.463 M aqueous solution of sodium bromide. The density of the solution is 1.22 g/mL. Find the following:
a.) mass of the solution
b.) grams of sodium bromide
c.) molality of the solution
d.) % (m/v) of the solution
e.) % (m/m) of the solution
Answer:
a.) 86.01 g.
b.) 3.36 g.
c.) 0.394 m ≅ 0.40 m.
d.) 4.77%.
e.) 3.9%.
Explanation:
a.) mass of the solution:
The density of the solution is the mass per unit volume.
∵ Density of solution = (mass of solution)/(volume of the solution).
∴ Mass of the solution = (density of solution)*(volume of the solution) = (1.22 g/mL)*(70.5 mL) = 86.01 g.
b.) grams of sodium bromide :
Molarity (M) is defined as the no. of moles of solute dissolved per 1.0 L of the solution.∵ M = (no. of moles of NaBr)/(Volume of the solution (L))
∴ no. of moles of NaBr = M*(Volume of the solution (L)) = (0.463 M )*(0.0705 L) = 0.0326 mol.
∵ no. of moles of NaBr = (mass of NaBr)/(molar mass of NaBr)
∴ mass of NaBr = (no. of moles of NaBr)*(molar mass of NaBr) = (0.0326 mol)*(102.894 g/mol) = 3.36 g.
c.) molality of the solution:
Molality (m) is defined as the no. of moles of solute dissolved per 1.0 kg of the solvent.∵ m = (no. of moles of NaBr)/(mass of the soluvent (kg))
no. of moles of NaBr = 0.0326 mol,
mass of solvent = mass of the solution - mass of NaBr = 86.01 g - 3.36 g = 82.65 g = 0.08265 kg.
∴ m = (no. of moles of NaBr)/(mass of the soluvent (kg)) = (0.0326 mol)/(0.08265 kg) = 0.394 m ≅ 0.40 m.
d.) % (m/v) of the solution:
∵ (m/v)% = [(mass of solute) /(volume of the solution)]* 100
∴ (m/v)% = [(3.36 g)/(70.5 mL)]* 100 = 4.77%.
e.) % (m/m) of the solution:
∵ (m/m)% = [(mass of solute) /(mass of the solution)]* 100
∴ (m/m)% = [(3.36 g)/(86.01 g)] * 100 = 3.9 %.
what has to happen in order for work to be done
Answer:
Explanation:
For work to be done, force must be applied to move an object in the direction of the applied force.
Work is the product of force and distance. Workdone describes a change of energy between places.
If we apply force to a body without moving it through a distance, no work is done.
Work is only done when force is applied to move or displace a body.
If we only apply force and no movement occurs, no work is done..
The unit of force is Joules.
In physics, work is done when a force is applied to an object and the object is displaced in the direction of the force. The work done is the product of the force's component in the direction of displacement and the distance the object moves. No displacement in the direction of the force means no work is done, even if effort is exerted.
Explanation:Concept of Work in PhysicsIn physics, for work to be done, two primary conditions must be fulfilled. First, a force must be applied to an object. Second, the object must experience a displacement in the direction of the force. If either of these conditions is not met, work is considered not to have occurred, regardless of the effort put in. For example, pushing against a wall with great effort does not constitute work unless the wall moves. If the wall does move, the energy used to cause this movement is the work done.
The work done is mathematically defined by the dot product of the force and displacement vectors, signifying that the direction of the force relative to the displacement is crucial in calculating the work performed. Therefore, when an external force causes an object to move, and this movement is in the same direction as the force, the product of the force's component along the direction of displacement and the distance moved is the work done. This could mean overcoming resisting forces like friction and moving a mass along a surface, or it could imply the conversion of one type of energy into another.
sodium sulfate decahydrate is used in chemical drying agent. how many waters are banned to sodium sulfate?
Answer:
Ten (10) molecules of water are bonded to sodium sulfate decahydrate.Explanation:
A hydrated compound is one that contains water molecules chemically bonded. So, the correct question is how many waters are bonded to sodium suilfate?
The latin prefix deca means ten (10), and the word hydrate means that contains water; then, decahydrate is used in chemistry to designate a compound that is bonded to 10 parts (molecules) of water.
Hence, sodium sulfate decahydrate means that each molecule of the compound is bonded to 10 molecules of water.
In the chemical formula, the water molecules of a hydrated compound are shown after the chemical formula of the compound using a period and a coefficient (the number of water molecules bonded) before the water molecules.
Then, given that the chemical formula for sodium sulfate is Na₂SO₄, the chemical formula for sodium sulfate decahydrate is Na₂SO₄·10H₂O.
Particles are arranged in a crystal structure in a sample of
Answer:
Ag(s) or Solid Silver. Silver in a solid phase has a face centered cubic crystal structure. Among your choices, silver is the only example of particles that are arranged in their crystal structure while the other choices are gases and liquid. Liquid and gases have loose atoms that do not form crystal structures.
Explanation:
Select all the correct answers.
Which statements correctly describe water boiling in a pot?
Air bubbles from the atmosphere are being absorbed.
The water’s internal kinetic energy is increasing.
The water is gaining internal potential energy.
The water’s temperature is increasing.
Individual water molecules are escaping.
Final answer:
When water boils, the water’s internal kinetic energy increases, and upon reaching the boiling point, the energy input turns into potential energy to convert water to steam. Air bubbles seen are not from the atmosphere but from dissolved gases, and the water's temperature does not increase beyond the boiling point.
Explanation:
When water is boiling in a pot, several physical changes occur. The water’s internal kinetic energy is increasing due to the heat supplied, which causes the water molecules to move faster. As the temperature of the water reaches the boiling point, the added energy goes into breaking the intermolecular forces, converting liquid water into water vapor, which is observed as boiling. This process is known as the phase transition from liquid to gas.
Air bubbles from the atmosphere are not being absorbed; instead, existing dissolved gases in the water can form bubbles. The water's temperature does not continue to increase once it reaches the boiling point, which for pure water at sea level is 100°C. At this point, any extra energy supplied by the stove is used to turn the water into steam, which is a process that involves gaining internal potential energy, rather than increasing temperature. Lastly, individual water molecules are indeed escaping from the pot, forming steam as they enter the gas phase.
A reaction is spontaneous if ΔG is ___?
negative, positive, or zero?
Answer:
A reaction is spontaneous if ΔG is negative.
Explanation:
The change in free energy (ΔG) is the difference between the heat released during a process and the heat released for the same process occurring in a reversible manner.The sign of ΔG gives an indication for the spontaneity of the reaction:If ΔG is negative, the reaction is spontaneous.
If ΔG = zero, the reaction is at equilibrium.
If ΔG is positive, the reaction is non-spontaneous.
find the mass of 3.50x10^23 molecules of nitrogen gas
Answer:
16.27 g.
Explanation:
It is known that every 1.0 mol of a compound contains Avogadro's no. of molecules (6.022 x 10²³).Using cross multiplication:
1.0 mol of N₂ gas contains → 6.022 x 10²³ molecules.
??? mol of N₂ gas contains → 3.50 x 10²³ molecules.
∴ The no. of moles of N₂ gas = (1.0 mol)(3.50 x 10²³ molecules)/(6.022 x 10²³ molecules) = 0.5812 mol.
∴ The mass of 3.50 x 10²³ molecules of N₂ gas = (no. of moles)*(molar mass) = (0.5812 mol)(28.0 g/mol) = 16.27 g.
Final answer:
To calculate the mass of 3.50x10²³ molecules of nitrogen gas, we apply the concept of molar mass (28.01 g/mol) and Avogadro's number, resulting in a mass of approximately 16.3 grams.
Explanation:
To find the mass of 3.50x10²³ molecules of nitrogen gas (N₂), we must first understand the concept of molar mass and Avogadro's number (6.02x10²³ mol⁻¹). The molar mass of N₂ is 28.01 g/mol, which means one mole (6.02×10²³ molecules) of nitrogen gas has a mass of 28.01 grams.
To calculate the mass of 3.50×10²³ molecules, we use the proportion method:
1 mole (6.02×10²³ molecules) : 28.01 g = 3.50×10²³ molecules : X g
Solving for X gives us the mass of the nitrogen gas:
X = (3.50×10²³ / 6.02×10²³) × 28.01 g
Therefore, X = 16.3 grams (approximately).
This calculation illustrates how we can determine the mass of a specific number of gas molecules using the principles of molar mass and Avogadro's number.
What pH would you expect for this solution:
[H+] = 1.0x 10^-4 M
(Please explain how you got your answer so I can understand how to do this in the long run)
A pH is an easy way to describe the acidity of a solution (determined by the [H+] concentration) - it’s easier to say that a cup of coffee has a pH of 5 rather than saying that the “hydrogen ion concentration is 10^-5 molar”.
The way pHs work is through logarithms, which convert a set of values into a new one using a base value. For example, pHs use a base 10 to simplify the numbers, while earthquake energy scales use a base of 32. An increase of 1 on the logarithmic scale is an “n” times increase in the scale, where “n” is the base of the logarithm. So, for example, in the case of pH, three solutions with a pH of 5, 6, and 7 can be related; the pH scale uses base ten, so the pH 6 solution is 10x more acidic than the pH 7, and the pH 5 is 100x (10x10) more acidic than the pH 7. For earthquakes, a magnitude 5 earthquake is 32x weaker than a magnitude 6 and 1,024x (32x32) weaker than a magnitude 7.
The pH formula looks like this:
pH = -log [H+]
The negative sign basically serves to make the low end acidic; without the negative, a pH of 14 would be extremely acidic instead of basic. It’s one of those things that you’ll just have to remember.
So, for your solution, just enter the concentration into the formula:
pH=-log[1.0 x 10^-4] = 4
The pH of this solution would be 4.
Hope this helps!
Which of the following terms best describes any solution? a)homogeneous
b)heterogeneous
c)dilute
d) saturated
Answer:
A) Homogeneous
Explanation:
Hope this helped :)
What mass of ammonium chloride is dissolved in 300 mL of a 0.875M solution?
Answer:
9.32 g.
Explanation:
Molarity is the no. of moles of solute per 1.0 L of the solution.M = (no. of moles of NH₄Cl)/(Volume of the solution (L))
M = 0.875 M.
no. of moles of NH₄Cl = ??? mol,
Volume of the solution = 300 mL = 0.3 L.
∴ (0.875 M) = (no. of moles of NH₄Cl)/(0.3 L)
∴ (no. of moles of NH₄Cl) = (0.875 M)*(0.3 L) = 0.2625 mol.
To find the mass of NH₄Cl, we can use the relation:no. of moles of NH₄Cl = mass/molar mass
∴ mass of NH₄Cl = (no. of moles of NH₄Cl)*(molar mass) = (0.2625 mol)*(53.491 g/mol) = 9.316 g ≅ 9.32 g.
The mass of ammonium chloride dissolved in 300 mL of a 0.875M solution is 14.90 g.
Explanation:To find the mass of ammonium chloride dissolved in 300 mL of a 0.875M solution, we need to use the formula:
Mass = Volume x Concentration x Molar mass
The molar mass of ammonium chloride is 53.49 g/mol. Substituting the given values, we get:
Mass = 0.300 L x 0.875 mol/L x 53.49 g/mol = 14.90 g
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The area from which a river and its tributaries collect water is called the:
a.
Rivertown
c.
Water cycle
b.
Drainage basin
d.
Pull zone
Answer:
b. Drainage basin
Explanation:
Which of these is the correct word equation for the reaction, 2C4H10 (g) + 1302 (g)
—> 8CO2 (g) + 10H2O (g)?
A) Water vapor and carbon dioxide gas react to form butane gas and oxygen gas.
B) Water vapor and oxygen gas react to form carbon dioxide gas and butane gas.
C) Butane gas reacts with oxygen gas to form carbon dioxide gas and liquid water.
D) Butane gas reacts with oxygen gas to form carbon dioxide gas and water vapor.
Answer:
D
Explanation:
The reactants are butane gas and oxygen, and the product is carbon dioxide and water VAPOR. The letter beside the water formula means it's a gas.
Final answer:
The correct word equation is that butane gas reacts with oxygen gas to form carbon dioxide gas and water vapor. This is a combustion reaction where the hydrocarbon butane combusts in the presence of oxygen to produce these products.
Explanation:
The correct word equation for the reaction 2C₄H₁₀ (g) + 13O₂ (g) ⇒ 8CO₂ (g) + 10H₂O (g) is D) Butane gas reacts with oxygen gas to form carbon dioxide gas and water vapor.
In this reaction, butane (C₄H₁₀) and oxygen (O₂) are the reactants, while carbon dioxide (CO₂) and water (H₂O) are the products. Since the reaction includes the conversion of gases and no liquids are mentioned in the context of products, we can conclude that the water produced is also in gaseous form which is commonly referred to as water vapor.
A complete combustion reaction always yields carbon dioxide and water as products, assuming ample oxygen is available. If the reaction had incomplete combustion, carbon monoxide (CO) could be present, but this is not indicated in the given equation.
What is an organic chemical?
Answer:
Organic chemistry is a subdiscipline of chemistry that studies the structure, properties and reactions of organic compounds, which contain carbon in covalent bonding. Study of structure determines their chemical composition and formula.
if the initial concentration of acetic acid is .200 M and the equilibrium concentration of H3O+ is .0019 M, calculate Ka for acetic acid
The acid dissociation constant (Ka) for acetic acid, given the initial concentration of 0.200 M and the equilibrium concentration of H3O+ is 0.0019 M, is 1.82 × 10⁻µ.
Explanation:To calculate the acid dissociation constant (Ka) for acetic acid, we can use the information provided that the initial concentration of acetic acid is 0.200 M and the equilibrium concentration of H3O+ is 0.0019 M. Using the chemical equation for the dissociation of acetic acid (CH3COOH):
CH3COOH(aq) ⇌ CH3COO−(aq) + H3O+(aq),
we know that at equilibrium, the concentration of H3O+ ions will be the same as the concentration of CH3COO− ions. Therefore, [CH3COO−] = [H3O+] = 0.0019 M.
Because acetic acid is a weak acid, we can assume that the change in concentration of acetic acid is roughly equal to the concentration of H3O+ ions produced. Thus, the equilibrium concentration of CH3COOH will be 0.200 M - 0.0019 M = 0.1981 M. The formula for Ka is:
Ka = [CH3COO−][H3O+] / [CH3COOH]
Substituting the equilibrium concentrations into this formula gives:
Ka = (0.0019 M)(0.0019 M) / (0.1981 M) = 1.82 × 10⁻µ,
which is the Ka for acetic acid.
Need Help ASAP- Chemistry
Answer:
Q1: 1.67 L.
Q2: Saturated solution.
Explanation:
Q1:
We have the role that the no. of millimoles before dilution is equal to the no. of millimoles after dilution.(MV) before dilution = (MV) after dilution
M before dilution = 10.0 M, V before dilution = 0.5 L.
M after dilution = 3.0 M, V after dilution = ??? L.
∴ V after dilution = (MV) before dilution / M after dilution = (10.0 M)(0.5 L) / (3.0 M) = 1.67 L.
Q2:
From the given curve, it is clear that the solubility of sodium nitrate at 35.0°C is 100 g per 100 g of water.
So, the mentioned solution is a saturated solution at this T.
A saturated solution is a chemical solution containing the maximum concentration of a solute dissolved in the solvent.
The total amount of energy before and
chemical reaction is the same. What can be sald about the energy in the reaction?
A It is destroyed
B It is created
C It is conserved
Dit is converted
Answer:
C: It is conserved
Explanation:
The reaction neither lost (exothermic) or gained (endothermic) energy, therefore the total energy remained the same and was conserved.
Answer:
D: It is converted
Explanation:
according to the law of conservation of energy:
In physics and chemistry, the law of conservation of energy states that the total energy of an isolated system remains constant; it is said to be conserved over time.
Meaning that energy can neither be created nor destroyed; rather, it can only be transformed or transferred from one form to another without any loss of energy
8g of aqueous Sodium Hydroxide reacts with 4g of aqueous Aluminum Chloride to produce aqueous Sodium Chloride and solid Aluminum Hydroxide. Balance the equation and give the limiting and excess reactants.
Answer:
The limiting reactant is AlCl₃ and the excess reactant is NaOH.
Explanation:
The balanced equation for the mentioned reaction is:3NaOH(aq) + AlCl₃(aq) → 3NaCl(aq) + Al(OH)₃(s)↓,
It is clear that 3.0 moles of NaOH(aq) react with 1.0 mole of AlCl₃(aq) to produce 3.0 moles of NaCl(aq) and 1.0 mole of Al(OH)₃(s).
Firstly, we need to calculate the no. of moles of (8.0 g) of NaOH and (4.0 g) of AlCl₃:no. of moles of NaOH = mass/molar mass = (8.0 g)/(40.0 g/mol) = 0.2 mol.
no. of moles of AlCl₃ = mass/molar mass = (4.0 g)/(133.34 g/mol) = 0.03 mol.
From stichiometry; NaOH reacts with AlCl₃ with (3: 1) molar ratio.∴ 0.09 mol of NaOH (the remaining 1.1 mol is in excess) reacts completely with 0.03 mol of AlCl₃.
So,
the limiting reactant is AlCl₃ and the excess reactant is NaOH.
_____ can be defined as the rate at which velocity changes
Answer: Acceleration can be defined as the rate at which velocity changes
Acceleration has the units m/s2.
Hope this helps! :D
Hello There!
"ACCELERATION" can be defined as the rate at which velocity changes
which law was used to determine the relationship between the volume and the number of moles in this equation?
Answer:
It is the Avogadro's Law that should be used to determine the relationship between the volume and the number of moles in the equation. This law relates the volume and the the amount in moles of a gas.
that should be used to determine the relationship between the volume and the number of moles in the equation. This law relates the volume and the the amount in moles of a gas.
Answer:
Volume = lwh
Explanation:
What happens to the molarity of a salt solution if the number of moles of salt in the solution is multiplied by three and the number of liters of the solution is also multiplied by three? The molarity of the solution remains unchanged. The molarity of the solution becomes three times as much. The molarity of the solution becomes six times as much. The molarity of the solution decreases.
Answer:
The molarity of the solution remains unchanged.
Explanation:
Consider the formula for the molarity [tex]M[/tex] of a solution:
[tex]\displaystyle M = \frac{n}{V}[/tex],
where
[tex]n[/tex] is the number of moles of solute in this solution, and[tex]V[/tex] is the volume of the solution.For this salt solution,
[tex]n_{1} = 3\;n_{0}[/tex], and[tex]V_{1} = 3\;V_{0}[/tex].Initial molarity:
[tex]\displaystyle M_{0} = \frac{n_{0}}{V_{0}}[/tex].
Final molarity:
[tex]\displaystyle M_{1} = \frac{n_{1}}{V_{1}} = \frac{3\;n_{0}}{3\;V_{0}} = \frac{n_{0}}{V_{0}} = M_{0}[/tex].
In other words, the molarity of the solution remains unchanged.
Answer:
The molarity of the solution remains unchanged
Explanation:
To heat 1g of water by 1c requires
A. 1 Volt
B. 1 Calorie
C. 1 Joule
D. 1 Watt
C, because specific heat is measured in Joules/grams°C
Answer: B) 1 Calorie
Explanation: The heat required to raise the temperature of 1 gram of a substance by 1 degree C is known as its specific heat capacity.
Specific heat capacity of water is [tex]\frac{4.184Joule}{g*0_C}[/tex] and we know that, 4.184 Joule = 1 Calorie
So, specific heat capacity of water is [tex]\frac{1Calorie}{g*0_C}[/tex] and hence the correct choice is B.
A balloon was partially filled with helium gas at room temperature. It occupied 4.0 liters of volume at 700.0 mmHg atmospheric pressure. When the balloon was released, it traveled upward until it burst at 99 mmHg atmospheric pressure. (Neglect any force exerted to stretch the rubber balloon.) What was the volume of the balloon when it burst? L
Answer:
28.28 L.
Explanation:
We can use the general law of ideal gas: PV = nRT.where, P is the pressure of the gas in atm.
V is the volume of the gas in L.
n is the no. of moles of the gas in mol.
R is the general gas constant,
T is the temperature of the gas in K.
If n and T are constant, and have two different values of V and P:P₁V₁ = P₂V₂
P₁ = 700.0 mm Hg, V₁ = 4.0 L.
at burst: P₂ = 99.0 mm Hg, V₂ = ??? L.
∴ V₂ = P₁V₁/P₂ = (700.0 mm Hg)(4.0 L)/(99.0 mm Hg) = 28.28 L.
How many neutrons does element X have if its atomic number is 25 and its mass number is 91?
Answer:
66
Explanation:
The number of neutrons is the atomic number (25) subtracted from the mass (91). So, 91 - 25 = 66.
The bond between F and Cl would be: pure covalent polar covalent ionic metallic
Answer:
Polar Covalent
Explanation:
Chlorine and Fluorine are both halogens. They are in group VII.
The Pauling's electronegativity value of these elements are:
F = 4.0
Cl = 3.0
Electronegativity of an element is a property that combines the ability of its atom to lose and gain electrons. It can be used to predict bond type.
For heteronuclear molecules where the electronegativity difference is between 0.5 and 1.7 there will not be an equal sharing of the electron pair between the atoms involved.
The bond that results is a Polar Covalent bond.
When the electronegativity difference is zero or less than 0.5, a non-polar covalent bond forms. There would be an equal sharing of the electron pair donated.
At what temperature (in C) will a sample of gas occupy 91.3 L if it occupies 45.0 L at 70.0°C? Assume constant pressure.)
Solution is here,
for initial case,
temperature(T1)=70°C=70+ 273=343K
vloume( V1) =45 L
for final case,
temperature( T2)=?
volume(V2)= 91.3 L
at constant pressure,
V1/V2 = T1/T2
or, 45/91.3 = 343/ T2
or, T2= (343×91.3)/45
or, T2=695.9 K = (695.9-273)°C=422.9°C
The temperature needed for a sample of gas to occupy 91.3 L, when originally it occupied 45.0 L at 70.0°C at constant pressure, is about 423.71°C.
Explanation:This question pertains to the ideal gas law equation (P1V1/T1 = P2V2/T2, where P is pressure, V is volume, and T is temperature), we must first convert our temperatures to Kelvin (K) since the ideal gas law uses absolute temperature. To convert from degrees Celsius to K, add 273.15, thus 70.0°C becomes 343.15K. As the problem states pressure is constant, we can ignore that component of the equation and it simplifies to V1/T1 = V2/T2.
By rearranging the equation to solve for V2, we get V2 = V1 (T2/T1). Given the volume of the gas at the initial temperature (V1 = 45.0 L), and temperature T2 with unknown value, we rewrite the equation as T2 = (V2 * T1) / V1. Substituting the given values into the equation gives T2 = (91.3 L * 343.15K) / 45.0 L, which calculates to approximately 696.86K, converting back to Celsius gives us around 423.71°C.
So, your sample of gas would need to be heated to approximately 423.71°C in order for it to occupy a volume of 91.3 L at constant pressure.
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What are hydrogen bonds?
O
A. An extra-strong form of the Van der Waals force between
molecules
O
O
B. The bonds between hydrogen and another atom in a molecule
C. The bonds between hydrogen atoms in an Hz molecule
D. Extra-strong intermolecular attractions between polar molecules
Answer:
D. Extra-strong
Explanation:
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