The stability of atoms whose subshells are half-filled with electrons is due to equilibrium and symmetry.
How does subshells half-filled with electrons confer stability?The stability of an atom of an element depends on the number of electrons in its valence shell.
Atoms whose valence shells are completely filled are particularly stable atoms.
Similarly, subshells half-filled with electrons are particularly stable.
The stability of subshells half-filled with electrons can be explained based on equilibrium and symmetry.
A half-filled subshell distributes the energy of the electrons evenly and symmetrically such that the atom attians stability.
Therefore, stability of subshells half-filled with electrons is due to equilibrium and symmetry.
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An electromagnet _____________
A. is stronger than a permanent magnet
B. points north
C. can be turned on and off
D. makes noise
I need the answer fast PLS
Answer:
C. can be turned on and off
Explanation:
An electromagnet becomes magnetic when it is part of a complete electric circuit. A switch is a part of an electric circuit that completes or break the circuit turning the circuit on and off.
(*) Sorry for my late answer but I hope this helps others that are looking for this.
I got 100% ;)
Which of the following is the correct definition of nuclear energy? A. energy of an object due to the random motion of its atoms and molecules B. energy an object has because of its motion or position C. energy produced from the splitting of atoms D. energy resulting from the flow of charged particles, such as electrons or ions
Answer:
c. energy from splitting energy
Explanation:
Which metal would cause the greatest increase in the temperature of the water in the calorimeter: the
one with the higher specific heat, or the one with the lower specific heat? Explain.
(THE EXPLANATION IS IMPORTANT)
Answer:
The one with higher specific heat
Explanation:
A metal with the highest specific heat will cause the greatest increase in temperature of water in a calorimeter because the metal would hold more heat, and then transfer it to the water.
Answer:
[tex] \sf \: \fbox{Metal \: with \: the \: higher \: specific \: heat.}[/tex]
Explanation:
HEAT:
In the universe there are only two mods of Transfer of Energy one is Heat and another is Work. That's why Heat and Work are well knowns Path function.
Specific Heat:
The specific Heat of any material is the heat gained or released by the material to raise or fall it's temperature by 1°C per unit mass of the material.
The heat gained or released (Q) is directly proportional to the mass of substance(m) and rise or fall of temp(∆T)
given by the equation,
[tex]\sf \: s = \frac{Q}{m \Delta T} [/tex]
Where S is the proportionality constant also known as specific Heat.
S.I. unit of s is joule/kg-K
C.G.S unit is cal/gm °C.
Specific heat of water: s = 4200 J/kg°C
Coming to the next important term calorimeter,
Calorimeter:
We already knew above that heat is not a form of energy it's a mod of transfer of energy, consider One Energy converted from State A to State B then the total heat(Transferred energy) during the process is measured by a device known as Calorimeter.
Now, coming to your question.
Consider a metal, with lower specific heat (s), the equation we derived above tells that specific heat is directly proportional to energy per unit change in temperature, that means if specific heat will be low, lesser amount of Energy(Heat) will be produced which will cause the minor increase in the temperature.
Which is a contradiction hence the answer would be Metal with the higher specific heat.
This is the final answer!
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.
A species is a group of organisms that closely resemble each other in physical appearance and behavior and can mate and produce young that can also mate and produce young. True or false?
false
true
Answer:
True
Explanation:
It's a true statement
Answer:
True
Explanation:
A species is a group of similar organisms that can breed with one another to produce fertile offspring. For example, humans are one species and dogs are another species. Individuals of the same species can reproduce to make more individuals of the same species.
A firework is fired from the ground straight up on a planet with an acceleration due to gravity of 6.82 m/s/s. The firework will not explode until the moment where it would have started to move back down again. The initial speed of the firework is 69.5 m/s. Use this information to find the height at which the firework explodes and the time it will be traveling upward.
Answer:
h = 384.4 m
t = 8.5 s
Explanation:
The firework will explode at the highest point. Because it would start to move downward at the highest point. Using 3rd equation of motion:
2ah = Vf² - Vi²
where,
a = acceleration due to gravity at that planet = -10.56 m/s²
h = maximum height = ?
Vf = Final velocity = 0 m/s (since, firework stops at highest point)
Vi = Initial Velocity = 90.1 m/s
Therefore,
2(-10.56 m/s²)(h) = (0 m/s)² - (90.1 m/s)²
h = 384.4 m
Now, we use 1st equation of motion:
Vf = Vi + at
0 m/s = 90.1 m/s + (-10.56 m/s²)(t)
t = 8.5 ss
A sample of methane gas contains 3.62x10^29 atoms of hydrogen. What is the mass of the sample?
The mass of the sample to methane that contains 3.62×10²⁹ atoms of hydrogen is 4810631.24 g
Avogadro's hypothesis6.02×10²³ atoms = 1 mole of Hydrogen
How to determine the mass of Hydrogen1 mole of Hydrogen = 2 g
Thus,
6.02×10²³ atoms = 2 g of Hydrogen
Therefore,
3.62×10²⁹ atoms = (3.62×10²⁹ × 2) / 6.02×10²³
3.62×10²⁹ atoms = 1202657.81 g of Hydrogen
How to determine the mass of methane 1 mole of methane, CH₄ = 12 + (4×1) = 16 gMass of H in 16 g of CH₄ = 4 × 1 = 4 gThus,
4 g of Hydrogen is present in 16 g of methane.
Therefore,
1202657.81 g of Hydrogen will be present in = (1202657.81 × 16) / 4 = 4810631.24 g of methane
Thus, we can conclude that the mass of the sample of methane is 4810631.24 g
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The picture compound has which Bond
Question 2 (1 point)
A group of friends is cooking an exotic stew in a house in South Florida. One of the
steps of the recipe is that they have to cool off the cooking mixture from 81.70 °C to
49.10 °C. The pot is too big to put it in a fridge for cooling down faster, the cooking
mixture weighted 34.6 kg. Fortunately, one of the friends remembered
thermochemistry and suggested that they put the pot in the small pool that is at the
house to cool it off faster. The pool was not heated and its temperature before
putting the pot with the stew was 19.24 °C. Given that the mass of water in the pool
was 4,825.6 kg, and the specific heat capacity of the pool is 4.30 J/(g°C) and that of
the cooking mixture is 4.20 J/(g°C), what is the final temperature of the pool after
the cooking mixture cooled down to the temperature needed by the recipe?
Your Answer:
Answer
units
Knowing that the system will attin a state of thermal equilibrium, the final temperature of the system is 19.24°C.
What is Thermochemistry?The term thermochemistry has to do with the heat evolved or absorbed in a chemical reaction.
Now we know that the heat gained by the pool is equal to the heat lost by the stew. Hence;
34.6 * 4.20 * ( 81.70 - T) = 4,825.6 * 4.30 * (T - 19.24)
11873 - 145.3T = 2075008T - 39923153.92
11873 + 39923153.9 = 2075008T + 145.3T
39935026.92 = 2075153.3T
T = 39935026.92/2075153.3
T = 19.24°C
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When .080 moles of propane burn at STP, what volume of carbon dioxide is produced?
The answer is 5.4 L (I NEED THE STEPS)
Taking into account the reaction stoichiometry and the definition of STP, 5.4 L of carbon dioxide is produced.
Reaction stoichiometryIn first place, the balanced reaction is:
C₃H₈ + 5 O₂ → 3 CO₂ + 4 H₂O
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
C₃H₈: 1 mole O₂: 5 moles CO₂: 3 moles H₂O: 4 molesMoles of CO₂ formedThe following rule of three can be applied: if by reaction stoichiometry 1 mole of C₃H₈ form 3 moles of CO₂, 0.080 moles of C₃H₈ form how many moles of CO₂?
[tex]amount of moles of CO_{2} =\frac{0.080 moles of C_{3} H_{8}x3 moles of CO_{2} }{1 mole of C_{3} H_{8} }[/tex]
amount of moles of CO₂= 0.24 moles
Definition of STP conditionThe STP conditions refer to the standard temperature and pressure. Pressure values at 1 atmosphere and temperature at 0 ° C are used and are reference values for gases. And in these conditions 1 mole of any gas occupies an approximate volume of 22.4 liters.
Volume of CO₂ producedYou can apply the following rule of three: If by definition of STP 1 mole of CO₂ occupies 22.4 L, 0.24 moles of CO₂ how much volume does it occupy?
[tex]volume of CO_{2} =\frac{0.24 molesx22.4 L}{1 mole}[/tex]
volume of CO₂= 5.376 L ≅ 5.4 L
Finally, 5.4 L of carbon dioxide is produced.
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the reaction stoichiometry:
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STP conditions:
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2. If you were to take a radio to the moon, which of the following would
correctly describe the changes to its mass and weight?
A. Its mass and weight would not change.
B. Its mass would increase, and its weight would remain the same
C. Its weight would increase, and its mass would remain the same
D. Its weight would decrease, and its mass would remain the sam
2KBr + Cl₂ → 2KCI + Br₂
What type of chemical reaction is this?
Answer:
Displacement reaction
Explanation:
A displacement reaction is a reaction where a more reactive halogen will displace a less reactive one.
Reactivity decreases down group 17. So Chlorine, being the more reactive halogen, substitutes in the place of Br which is less reactive.
What are two relatively unique physical properties of water? What impact do these properties have on life on Earth?
Answer:
Polar molecule. A neutral, or uncharged molecule that has an asymmetric internal distribution of charge, leading to partially positive and partially negative regions
Cohesion The attraction of molecules for other molecules of the same kind
Adhesion The attraction of molecules for other molecules of a different kind
Density The mass per unit volume of a substance
Specific heat capacity The amount of heat needed to raise the temperature of one gram of a substance by one degree Celsius
Heat of vaporization The amount of energy needed to change one gram of a liquid substance to a gas at constant temperature
Polar substance. a molecule that is neutral or uncharged but has an asymmetric internal charge distribution that produces both positive and negative regions.
What are Physical properties ?Cohesion molecules' attraction to other molecules of the same sort. Adhesion the pull of certain molecules toward others of a different type
Density a substance's mass per unit volume particular heat capacity The amount of heat required to increase a substance's temperature by one degree Celsius in one gram
Vaporization-related heat energy required to convert one gram of a liquid material into a gas at a fixed temperature.
Therefore, Polar substance. a molecule that is neutral or uncharged but has an asymmetric internal charge distribution that produces both positive and negative regions.
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345.50 grams of C6 H12 O6 = how many mol C6H12O6 ? - (MM=180.16g/mol).
100.0grams of O2 = how many mol O2? - (MM=32.00g/mol).
14.37 moles of AgNO3 = how many grams AgNO3? - (MM= 169.87g/mol).
Answer:
0.56 M
Explanation:
We are given;
Mass of glucose solute is 50.50 g
Volume of solution is 500 mL
We are required to calculate the concentration of glucose.
We need to know that, molarity is the concentration of a solution in moles per liter.
Molarity = Number of moles ÷ Molar mass
if the concentration of H+ ions in a solution is 3.16 x 10^-4 mol/L then what is the concentration of OH- ions
Answer:
10-4mol/l
[H+]=10-7 , which we call a pH of 7.
This means, for example, that a hydrogen-ion concentration of a solution with a pH of 4 is 10-4mol/l, meaning it contains 0.0001 mol of hydrogen ions in a solution of 1 liter.
Explanation:
3.12×10⁻¹⁰M is the concentration of OH⁻ ions. Concentration in chemistry refers to the quantity of a material in a certain area.
What is concentration?
Concentration in chemistry refers to the quantity of a material in a certain area. The ratio of the solvent in the solution to the solvent or whole solution is another way to define concentration. In order to express concentration, mass every unit volume is typically used. The solute concentration can, however, alternatively be stated in moles or volumetric units.
If a formula describing a shape's boundary is known, it is possible to use integral calculus to determine the volumes of more complex shapes. No object in the dimensions of zero, one, or two has volume; in the dimensions of four and above, the hypervolume is a concept similar to the standard volume.
[H⁺] [OH⁻] = 10 ⁻¹⁴
3.16 x 10⁻⁴ × [OH⁻] = 10 ⁻¹⁴
[OH⁻] = 3.12×10⁻¹⁰M
Therefore, 3.12×10⁻¹⁰M is the concentration of OH⁻ ions.
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. Define the term Flame?
Answer:
A hot glowing body of ignited gas that is generated by something on fire.
An old 0.500 L lecture bottle of triethylamine (N(CH₂CH₃)₃) was found in a lab and needed for a synthesis reaction. A pressure regulator indicated a pressure of 27.0 psi, and the lab was at room temperature (25.0°C). What mass of vaporized triethylamine in grams was left in the lecture bottle?
Answer:
About 3.81 grams.
Explanation:
We can use the ideal gas law. Recall that:
[tex]\displaystyle PV = nRT[/tex]
Note that the universal gas constant R has the value 0.08206 L-atm/mol-K.
Hence, convert the measured pressure to atms (1 atm = 14.7 psi):
[tex]\displaystyle 27.0\text{ psi} \cdot \frac{1\text{ atm}}{14.7\text{ psi}} = 1.84\text{ atm}[/tex]
Rearrange the equation to solve for n, the number of moles of vaporized triethylamine and evaluate. The temperature is (25.0 + 273.15 ) K = 298.2 K:
[tex]\displaystyle \begin{aligned} n& = \frac{PV}{RT} \\ \\ & = \frac{(1.84\text{ atm})(0.500\text{ L})}{\left(\dfrac{0.08206\text{ L - atm}}{\text{mol-K}}\right)(273.2\text{ K})} \\ \\ &= 0.0376\text{ mol N(CH$_2$CH$_3$)$_3$}\end{aligned}[/tex]
Convert from moles to grams:
[tex]\displaystyle 0.0376\text{ mol N(CH$_2$CH$_3$)$_3$} \cdot \frac{101.22\text{ g N(CH$_2$CH$_3$)$_3$}}{1\text{ mol N(CH$_2$CH$_3$)$_3$}} = 3.81\text{ g N(CH$_2$CH$_3$)$_3$}}[/tex]
In conclusion, there is about 3.81 grams of vaporized triethylamine in the lecture bottle.
what were possible experimental reasons for error in determining the neutralizing power of antacids ?
1000*
Explanation:
the deter monagex has to neutralize power because of the error and that leads to 1000*
6Li + N2 → 2Li3N chemical word equation
Answer:
this is an Oxidation-reduction
Explanation:
like is w reducing agent, N2 is an oxidizing agent
Based on the following data, what is the I-I bond energy?
[tex]\frac{1}{2}[/tex]H2(g) + [tex]\frac{1}{2}[/tex]I2(g) → HI(g); ΔH = 26.36 kJ
Bond Bond Energy (kJ/mol)
H-H 435
H-I 295
A) 208 kJ/mol
B) 155 kJ/mol
C) 365 kJ/mol
D) -208 kJ/mol
E) -155 kJ/mol
Answer:
please you left that of I2 gas
What effect would you expect this to have on CO2 levels in the atmosphere?
expect what to have?!?!?!?
What’s the answer?????? I accidentally clicked the 1st one.
Answer:
its the 1st one at the top
How many grams of CO2 are produced from the burning of 3.0 mol of amyl alcohol?
2C5H11OH + 15O2➡️ 10CO2 + 12H2O
*Please show work
The amount, in grams, of [tex]CO_2[/tex] that would be produced from the burning of 3.0 mol amyl alcohol would be 660.15 grams
Stoichiometric calculationFrom the equation of the reaction:
[tex]2C_5H_1_1OH + 15O2 ---- > 10CO_2 + 12H_2O[/tex]
The mole ratio of amyl alcohol to the [tex]CO_2[/tex] produced is 2:10.
Thus, for 3.0 mol of amyl alcohol, 15 mol of [tex]CO_2[/tex] would be produced.
Mass of 15 mol [tex]CO_2[/tex] = 15 x 44.01 = 660.15 grams
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Scenario A: 100 g of glucose in the presence of unlimited oxygen is metabolized through aerobic respiration.
Scenario B: 100 g of glucose in the absence of oxygen is metabolized through anaerobic respiration.
Would the mass of products produced in Scenario A be greater than, less than, or equal to the mass of products produced in Scenario B? Justify your answer.
How many atoms are in 0.560 moles of iron?
Answer:
3.37 × 10²³ atoms
Explanation:
Number of atoms = number of moles × 6.02 × 10²³
Number of atoms = 0.560 × 6.02 × 10²³
Number of atoms = 3.37 × 10²³ atoms
Calculate the specific heat in J/(g·ºC) of an unknown substance if a 2.50-g sample releases 12.0 cal as its temperature changes from 25.0ºC to 20.0ºC. _________J/(g·°C)
Answer:
[tex]\fbox{c = - 4.01 \: joule/g°C}[/tex]
Step by step explanation:
Given:
Mass of given sample (m) = 2.50 g
Initial temperature (T1) = 25°C
Final temperature (T2) = 20°C
Heat Energy Q = 12 cal
To find:
[tex]Specific \: Heat \: c = \: ?[/tex]
Solution:
We know that,
Specific heat of any substance is directly proportional to the mass and change in temperature.
Represented by equation,
[tex]Q = mc \triangle T[/tex]
Where,
Q = Heat Energy
m = mass of given sample
c = specific heat
∆T = change in temperature
Substituting corresponding values,
[tex]Q = mc \triangle T \\ 12 = 2.5\times c \times (20-25) \\ c = \frac{12}{2.5 \times ( - 5)} \\ c = - 0.96 \: cal/g°C \\ [/tex]
We also know that,
[tex]1 \: cal = 4.184 \: joules[/tex]
multiplying above answer by 4.184,
[tex]c = - 0.96 \times 4.184 \\ \fbox{c = - 4.01 \: joule/g°C}[/tex]
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An empty beaker has a measured mass of 27.234 g. When some salt is added to the beaker, the combined mass is 35.9564 g. Calculate the mass of the salt only (show work), reporting your answer to the correct number of significant figures.
The mass of the salt only if 35.9564g is the combined mass of the beaker and the salt is 8.7224g
How to calculate mass?According to this question, an empty beaker has a measured mass of 27.234g. However, when some salt is added to the beaker, the combined mass is 35.9564g.
This means that to calculate the mass of the salt in the beaker, we have to subtract the mass of the empty beaker from the combined mass as follows:
mass of salt only = 35.9564g - 27.234g
mass of salt only = 8.7224g
Therefore, the mass of the salt only if 35.9564g is the combined mass of the beaker and the salt is 8.7224g.
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H2O2_H2O+O2 balance the equation using inspection
Answer:
2H2O2 → 2H2O + O2
Which 2 elements has reactivity that is similar to chlorine?
pls help me with this
Answer:
silver
5/20
=0.25.................
Answer:
C
Explanation:
Aluminum density = 0.5
Iron density = 2
Gold density = 1
Silver density = 0.25
The smallest value is 0.25 hence silver has less density.
About how many centimeters will make an inch?
A)5
B)2+
C) 200
D)10
Answer: B) 2+
Explanation:
There are exactly 2.54 centimeters in an inch, the closest option is:
B) 2+
Answer:
2.54 centimetres
Explanation:
Ur options are wrong
