Answer:
The correct answers are (1) True (2) London dispersion force (3) one of the option is missing, none of these three is an answer (4) The total number of electrons increases down the group, and this increases the strength of the intermolecular forces (5) London dispersion forces which are always present.
Explanation:
Given: An instantaneous dipole occurs when a molecule's moving electrons are briefly more concentrated in one place than another, causing the molecule to become temporarily polarized.
Answer: True
when the electrons moving in a molecule or an atom move towards one end of the molecule or atom the other end has a small positive pole at that time and the end where electrons move has a small negative pole. So, a dipole is formed for that instant.
(2) What type of intermolecular force occurs between all substances?
Answer: London dispersion force
remember from first part how an instantaneous dipole is formed. When a pole is formed at that instant the molecule in neighborhood can interact with the dipole that was formed. The dipole that was formed has a positive pole and a negative pole. If the neighboring molecule is present near positive pole it’s electrons will get attracted to the positive pole of the dipole. This interaction is called London dispersion force. Since every atom or molecule or ion in the universe has electrons, so there is development of instantaneous dipole in each of them and each one of them has London dispersion force acting on them.
(3) When comparing [tex]H_2,\;NH_3,\;O_2,\; \rm{and}\;{CH_4[/tex] which of the following statements is correct?
Answer: one of the option is missing, none of these three is an answer.
(4)The boiling points of diatomic halogens are compared in the table.
Answer: The total number of electrons increases down the group, and this increases the strength of the intermolecular forces.
(5) What is the strongest intermolecular force that occurs between molecules of [tex]CO_2[/tex]?
Answer: London dispersion forces which are always present.
London forces are weakest forces, if other forces would have been present then we would have ignored London forces but since no other forces are present, the only choice is London forces.
[tex]CO_2[/tex] is a non polar molecule, it does not have permanent dipole moment. So there are no chances of dipole-dipole, [tex]CO_2[/tex] doesn’t have a positive or negative charge so even not ionic bond.
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The pH of a solution is 1.20. What is the [H3O+] for the solution?
1.58 × 10−2 M
6.31 × 10−2 M
1.58 × 101 M
6.31 × 101 M
Answer:
[H₃O⁺] = 6.31 x 10⁻² mol·L⁻¹
Explanation:
pH = -log[H₃O⁺], so [tex][\text{H}_{3}\text{O}^{+}] = 10^{- \text{pH}} \text{ mol/L}[/tex]
[tex][\text{H}_{3}\text{O}^{+}] = 10^{-1.20}\text{ mol/L} = 6.31 \times 10^{-2}\text{ mol/L}[/tex]
Answer:
[tex]6.31*10^{-2}[/tex]
Explanation:
Hello! To calculate the pH we have the following formula:
ph = -log [H3O +]
In this case we have the pH value so the formula is
[H3O +] = [tex]10^{-pH}[/tex]
[H3O +] = [tex]10^{-1.2}[/tex]
We use the inverse of the log
[H3O +] = [tex]6.31*10^{-2}[/tex]
So the correct answer is [tex]6.31*10^{-2}[/tex]
The movement of organisms into a range is called
A. immigration.
B. emigration.
C. population shift.
D. carrying capacity.
Immigration is the movement of organisms into a population, increasing its size and growth rate. Emigration is the movement out of a population. Carrying capacity is the maximum population size that the environment can sustain. Hence, option A, immigration, is correct.
The movement of organisms into a range is called immigration. Immigration is the movement of individuals into a population from other areas, which increases the population size and growth rate. In contrast, emigration refers to the movement of individuals out of a population's range. When an animal migrates, it does so because it can find resources there or because the habitat is a good fit for it. When an animal emigrates, it signifies that its natural habitat is no longer good for it and that it must find a new one. The definition of population change is a shift in the proportions of the various groups of people that make up a population. Carrying capacity is related to population size as well, but it describes the maximum number of individuals of a species that the environment can support, not the movement into a range. Thus, the correct answer to the question is A. immigration.
what determines the volume of a gas?
Explanation : Gases, unlike solids and liquids, have neither fixed volume nor shape. They are molded entirely by the container in which they are held. We have three variables by which we measure gases: pressure, volume, and temperature. ... From this, we derive the molar volume of a gas (volume/moles of gas).
Answer : The volume is determined by the pressure, the amount of gas present, and the temperature.
Based on their locations in the periodic table, which best compares the properties of the metalloids arsenic and antimony?
Answer:
Arsenic has a more nonmetallic behavior than antimony because arsenic's atoms have fewer electron shells.
Explanation:
All substances are composed of which type of matter?
A. ions
B. mixtures
C. elements
D. molecules
Which statement best explains why calcium has a larger atomic radius than magnesium?
A.
Calcium has a stronger nuclear charge than magnesium.
B.
Calcium has electrons in more energy levels than magnesium.
C.
Calcium has more neutrons than magnesium.
D.
Calcium’s third energy level contains more electrons than magnesium’s.
Electron shielding effects reduces the effect of a full nuclear charge. As more of the core electrons are added, they begin to 'shield' the valence electrons from the increasingly positive nucleus. But this will allow the outer electrons to move farther away from the nucleus, hence increasing atomic size. The electron shielding effect is responsible for the increase in atomic size moving down groups.
B. Calcium has electrons in more energy levels than magnesium.
B. Calcium has electrons in more energy levels than magnesium.
Question 9 Saved
When electron move from an excited state to their ground state a continuous spectrum is emitted.
Question 9 options:
True
False
I believe the answer to this is true.
Which of the following would label the boxes correctly?
Question 1 options:
1) endothermic; 2) exothermic
1) products; 2) reactants
1) reactants; 2) products
1) exothermic; 2) endothermic
Which phosphate in this tetranucleotide would be radioactive? Note that the phosphates are numbered 1-4 in red from top to bottom?
The phosphodiester bonds contains a sugar attached to a phosphate group. Since one outermost phosphate is used to form a phosphate bond everytime, from a precursor containing innermost radiolabelled phosphate, the third phosphate groups will be radioactive in nature. So correct answer is 3.
Hope that helps!
A. List three things that your body strives to keep constant. (example metabolism)
B. Describe one way in which each of the items you listed in Part A could be at least temporarily disrupted from equilibrium. Can you think of a way your body could respond to restore homeostasis after one of these disruptions?
Final answer:
Homeostasis is the process by which the body maintains constant conditions. The body strives to keep temperature, blood glucose level, and blood pH constant. Disruptions to these can be countered by physiological responses to restore equilibrium.
Explanation:
Homeostasis is the process by which the body strives to maintain constant conditions. Three things that the body strives to keep constant are temperature, blood glucose level, and blood pH.
Temperature can be disrupted from equilibrium when the body is exposed to cold or hot temperatures. In response, the body can constrict blood vessels and shiver to generate heat or sweat and dilate blood vessels to cool down.
Blood glucose level can be disrupted when it rises after a meal. The body responds by releasing insulin, which helps lower blood glucose levels by facilitating the uptake of glucose by cells or storing glucose as glycogen in the liver.
Lastly, blood pH can be disrupted by an increase or decrease in acidity. The body can respond by adjusting the breathing rate to eliminate excess carbon dioxide or increasing the production of bicarbonate ions in the kidneys to restore pH balance.
What is an ephemeral stream? A)one that flows only after rainfall B) one that flows only in flat lands C) one that is formed only from mechanical weathering D) one that is formed only from chemical weathering
Answer: Option (a) is the correct answer.
Explanation:
The stream that flows during or after the rainfall is called an ephemeral stream. This stream occurs in areas where there is less rainfall or deficiency of moisture.
The stream that flows only in flat lands is called as river.
Mechanical weathering results in the breaking of rocks causes ice wedging.
Chemical weathering results in the change in molecular structure of rocks and soil.
Thus, it can be concluded that option (a) is the correct answer.
A 29.950 g sample of an unknown metal is heated to 100.0 °c. The metal is then poured into 50.0 g of water in an insulated coffee cup calorimeter. The temperature of water rises from 25.0 ºc to 27.7 ºc. What is the specific heat of the metal?
Answer : The specific heat of metal is, [tex]0.261J/g^oC[/tex]
Explanation :
In this problem we assumed that heat given by the hot body is equal to the heat taken by the cold body.
[tex]q_1=-q_2[/tex]
[tex]m_1\times c_1\times (T_f-T_1)=-m_2\times c_2\times (T_f-T_2)[/tex]
where,
[tex]c_1[/tex] = specific heat of unknown metal = ?
[tex]c_2[/tex] = specific heat of water = [tex]4.18J/g^oC[/tex]
[tex]m_1[/tex] = mass of unknown metal = 29.950 g
[tex]m_2[/tex] = mass of water = 50.0 g
[tex]T_f[/tex] = final temperature of water = [tex]27.7^oC[/tex]
[tex]T_1[/tex] = initial temperature of unknown metal = [tex]100^oC[/tex]
[tex]T_2[/tex] = initial temperature of water = [tex]25.0^oC[/tex]
Now put all the given values in the above formula, we get
[tex]29.950g\times c_1\times (27.7-100)^oC=-50.0g\times 4.18J/g^oC\times (27.7-25.0)^oC[/tex]
[tex]c_1=0.261J/g^oC[/tex]
Therefore, the specific heat of metal is, [tex]0.261J/g^oC[/tex]
OFFERING 99 POINTS AND BRAINLIEST TO BEST ANSWER!!!
How many valence electrons are in an atom with the electron configuration in example A? Example A: 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 4p^2
A. 22
B. 2
C. 4
D. 6
The x number in ^x indicates the number of electronics in an obit, e.g. 1s^2 means there are 2 electrons in the 1s orbit.
Total number of electrons in A = 2 + 2 + 6 +2 + 6 + 2 + 2
= 22
VALENCE electrons are those in the outer most shell.
In A, there are 4s^2 + 4p^2: 2 + 2 = 4
Answer should be C instead. So sorry for the mistake earlier!
Example A: 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 4p^2
counting e-: 2 2 6 2 6 2 2
2+2+6+2+6+2+2 = 22
ans is A. 22
Which of the following statements about Bohr's model of the atom is true? Bohr's model explains the chemical behavior of all atoms.
Bohr’s model does not take into account the interactions multiple electrons would have with one another.
Bohr's model explains the spectra of atoms with more than one electron.
Bohr's model takes into account the interactions multiple electrons would have with one another.
I believe the answer is "Bohr's model explains the chemical behavior of all atoms."
How is the hydrosphere and the geosphere alike
A ball roliling straight until bradley kicks it which of newtons law is it
If a subject is changing from a vapor to a liquid, like steam on a mirror, it is said to be ---------- ?
condensation
Explanation:Condensation is the change of water from its gaseous form (water vapor) into liquid water. Condensation generally occurs in the atmosphere when warm air rises, cools and looses its capacity to hold water vapor. As a result, excess water vapor condenses to form cloud droplets.
Condensation is the reverse of vaporization.
Answer:
Condensing...
Explanation:
The 4 water cycles, evaporation, condensation, precipitation and collection, are what is happening here...... at least one of them. Condensation is when "water which collects as droplets on a cold surface when humid air is in contact with it" as defined in the dictionary or in this case, when a subject is changing from a vapor to a liquid. I hope this helps!
An Ammonia molecule is made up of one nitrogen and 3 hydrogen atoms, it has a formula NH3. What is the mass of one more Ammonia? **Hint find the molar mass of ammonia by adding up all of the masses of the elements in the compound.
The molar mass is the sum of the mass of all the atoms of a particular molecule.
The unit of molar mass is grams per mole.
The atomic mass of H = 1.00
The atomic mass of N = 14.00
The molar mass of ammonia = atomic mass of N + 3 x (atomic mass of H)
= 14.00 + 3 x (1.00) = 17.00
Therefore the molar mass of ammonia is 17g/mol
The correct answer is 17g/mol.
Which of the following indicates that an exothermic reaction has taken place?
A. a change in color
B. release of heat and/or light energy
C. cooling of the surroundings
D. absorption of heat by the reaction ...?
The option B is correct option. Which is release of heat and/or light energy .
Explanation:According to the definition of exothermic reaction :
An exothermic reaction is a chemical reaction that releases energy by light or heat.
From definition option B (release of heat and/or light energy) indicates that an exothermic reaction has taken place.
.
Answer: Option (B) is the correct answer.
Explanation:
An exothermic reaction is defined as the chemical reaction in which there occurs release of heat.
For example, [tex]A + B \rightarrow AB + Heat[/tex]
In an exothermic reaction, energy of reactants is more than the energy of products.
Whereas an endothermic reaction is defined as a chemical reaction in which heat is absorbed by reactant molecules.
For example, [tex]A + B + Heat \rightarrow AB[/tex]
In endothermic reaction, energy of reactant molecules is less than the energy of products.
Thus, we can conclude that release of heat and/or light energy indicates that an exothermic reaction has taken place.
A sample of gas in a closed container at a temperature of 100.0°C and 3.0 atm is heated to 300.0°C. What is the pressure of the gas at the higher temperature?
Answer:- 4.6 atm.
Solution:- In this problem, the volume is constant and the pressure is changing as the temperature is changed. It's based on Gay-Lussac's law which states that, "At constant volume, pressure of the gas is directly proportional to the kelvin temperature."
The equation used for solving the problems based on this law is:
[tex]\frac{P_1}{T_1}=\frac{P_2}{T_2}[/tex]
Where, [tex]P_1[/tex] is initial pressure and [tex]P_2[/tex] is final pressure.
Similarly, [tex]T_1[/tex] is initial temperature and [tex]T_2[/tex] is final temperature.
[tex]P_1[/tex] = 3.0 atm
[tex]T_1[/tex] = 100.0 + 273 = 373 K
[tex]T_2[/tex] = 300.0 + 273 = 573 K
[tex]P_2[/tex] = ?
Let's plug in the values in the equation and solve it for final pressure:
[tex]\frac{3.0atm}{373K}=\frac{P_2}{573K}[/tex]
[tex]P_2=\frac{(3.0atm*573K)}{373K}[/tex]
[tex]P_2=4.6atm[/tex]
So, the pressure of the gas at higher temperature is 4.6 atm.
Initial temperature of the gas = 100.0°C + 273 = 373 K
Initial pressure of the gas = 3.0 atm
Final temperature of the gas = 300.0°C + 273 = 573 K
According to Pressure Law,
P₁/T₁ = P₂/T₂
where P₁ and T₁ are the initial pressure and temperature respectively, and P₂ and T₂ are the final pressure and temperature respectively.
Plugging in the given data in Pressure Law we have,
3.0 atm/ 373 K = P₂/573 K
P₂ = (3.0 atm x 573 K)/ 373 K
P₂ = 4.6 atm
Thus, the pressure of the gas at the higher temperature is 4.6 atm.
What is the approximate vapor pressure when the liquid water boils at about 50°C? 230 mmHg 5 mmHg 760 mmHg 380 mmHg
The correct answer is 230 mmHg.
When liquid water boils at 100°C, the water vapor pressure is 760 mmHg
Hence, when liquid water boils at 50°C, the water vapor pressure is (760/2) mmHg or 230 mm Hg.
As the boiling temperature of water halves so does the vapor pressure of water. This is in accordance to Pressure Law.
According to Pressure law, pressure is directly proportional to the absolute temperature, at constant volume.
Answer:
230 mmHg
Explanation:
Which two values for `DeltaG` and E°cell correctly indicate a spontaneous reaction?
Well as an spontaneous reaction will have a negative gibbs free energy (delta g) and a positive e cell and also the E cell is also measured in V, then your answer is the first one: ΔG = –295kJ, E°cell = +1.53 v. Hope this works
Multichoice
When a double displacement reaction takes place, one of the products must be _____.
1. a salt
2. a gas
3. a precipitate
4. water
Answer: The correct answer is Option 1.
Explanation:
A double displacement reaction is defined as the reaction in which exchange of ions takes place. The general equation for the reaction follows:
[tex]AB+CD\rightarrow AD+CB[/tex]
During this reaction, one of the product formed is always a salt.
A gas is formed in a single displacement reaction and not in double displacement reaction.
A precipitate is formed in some of the double displacement reaction.
Water is formed in neutralization reaction when an acid reacts with a base to produce a salt and water.
Hence, the correct answer is Option 1.
Answer:
a salt
Explanation:
Only the _____ word in an organism's complete scientific name has its first letter capitalized
Answer:
it's first I don't know why that dude has such a low rating I got it correct from his/her answer.
Explanation:
What is the freezing point of a solution of sugar dissolved in water if the concentration of the solution is 0.24 m
A. -.446
B. .93
C. .446
Hey there!:
Using relation:
Δt = Kf * m
For water , Kf = 1.86 K/molal
Putting values:
Δt = 1.86 * 0.24
Δt = 0.446
So , Freezing point = - 0.446ºC
Answer A
Hope that helps!
The depression in freezing point here for the sugar solution is 0.466 degree Celsius. Hence the freezing point of the sugar solution is -0.446. Hence, option A is correct.
What is freezing point ?Freezing point of a solution is the temperature at which the solution changes from liquid to solid state.
To determine the freezing point of a solution of sugar dissolved in water, we need to use the freezing point depression equation:
ΔTf = Kf × molality
where ΔTf is the change in freezing point, Kf is the freezing point depression constant for the solvent (water in this case), and molality is the concentration of the solution expressed in moles of solute per kilogram of solvent.
Assuming a Kf of 1.86 °C/m for water, and a molality of 0.24 m for the sugar solution, we can calculate the change in freezing point:
ΔTf = 1.86 °C/m × 0.24 m = 0.4464 °C
This means that the freezing point of the solution will be lowered by 0.4464 °C compared to the freezing point of pure water. Since the freezing point of pure water is 0 °C, the freezing point of the sugar solution will be:
0 °C - 0.4464 °C = -0.4464 °C
Therefore, the freezing point of the solution is approximately -0.4464 °C, which is closest to option A. -0.446.
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Determine the empirical formula of a hydrate FexFy.ZH2O. It contains 0.676 g of iron combined with 0.460 g of fluorine and 0.870 g of water (H2O).
Hey there!:
Number of moles of iron:
Molar mass iron: 55.85 g/mol
0.676 / 55.85 => 0.012 moles of iron
Number of moles of fluorine:
Molar mass fluorine : 19 g/mol
0.460 / 19 => 0.024 moles of fluorine
Number of moles of water:
Molar mass water : 18.02 g/mol
0.870 / 18.02 => 0.048 moles of water
Simplest mol ratio is :
iron ( Fe ) = 0.012 / 0.012 => 1.0 mol
Florine ( F ) = 0.024 / 0.012 => 2.0 moles
Water ( H2O ) = 0.048 / 0.012 => 4 moles
Therefore:
Empirical formula is:
FeF2.4H2O
Hope that helps!
An atom has 9 electrons and 9 protons at the start . If it loses 2 electrons, the net charge on the atom will be ? If the atom instead gains 4 electrons the net charge will be ?
Answer : If it loses 2 electrons, the net charge on the atom will be (+2) and If it gains 4 electrons, the net charge on the atom will be (-4).
Explanation :
We are given:
Number of electron in an atom = 9
Number of protons in an atom = 9
Atomic number is defined as the number of protons or electrons that are present in a neutral atom.
Atomic number = number of protons = number of electrons
An ion is formed when an atom looses or gains electron.
When an atom looses electrons, it will form a positive ion known as cation.
When an atom gains electrons, it will form a negative ion known as anion.
According to the question,
When the atom loses 2 electrons then the net charge on the atom will be (+2) because it will form a positive ion by losing electrons.
When the atom gains 4 electrons then the net charge on the atom will be (-4) because it will form a negative ion by gains electrons.
Thomas has 235 grams of K2S in the chemistry lab. How many atoms of potassium (K) are in 235 grams of the compound?
A.
2.13 × 1023
B.
4.26 × 1023
C.
2.57 × 1024
D.
3.37 × 1024
E.
7.08 × 1024
Answer : The correct option is, (C) [tex]2.57\times 10^{24}[/tex]
Solution for Part 1 : Given,
Mass of [tex]K_2S[/tex] = 235 g
Molar mass of [tex]K_2S[/tex] = 110.262 g/mole
First we have to calculate the moles of [tex]K_2S[/tex].
[tex]\text{Moles of }K_2S=\frac{\text{Mass of }K_2S}{\text{Molar mass of }K_2S}=\frac{235g}{110.262g/mole}=2.13moles[/tex]
Now we have to calculate the number of atoms of potassium in the given compound.
In the given compound, there are 2 atoms of K and 1 atom of S.
As, 1 mole contains [tex]2\times 6.022\times 10^{23}[/tex] number of potassium atoms
So, 2.13 moles contains [tex]2.13\times 2\times 6.022\times 10^{23}=2.57\times 10^{24}[/tex] number of potassium atoms
Therefore, the number of potassium atoms in given compound is, [tex]2.57\times 10^{24}[/tex]
Explanation for Part 2 :
Statement 1 : A balloon shrinks when it's taken outside in the winter.
This statement follow the Charles's law. There is a direct relation between the temperature and volume. As the temperature decreases, the volume also decreases and vice-versa.
Statement 2 : A closed, flexible container expands when it's heated.
This statement follow the Charles's law. There is a direct relation between the temperature and volume. As the temperature increases, the volume also increases and vice-versa.
Statement 3 : When the size of an air chamber is increased, the air pressure decreases.
This statement follow the Boyle's law. There is an inverse relation between the pressure and volume. As the pressure decreases, the volume increases and vice-versa.
Statement 4 : Pressing on an inflated balloon decreases its size.
This statement follow the Boyle's law. There is an inverse relation between the pressure and volume. As the pressure increases, the volume decreases and vice-versa.
Statement 5 : A balloon expands when air is blown into it.
This statement follow the Avogadro's law. There is a direct relation between the number of moles of gas and volume. As the number of moles of air increases, the volume also increases and vice-versa.
Answer:
2.57 x 10^24
Explanation:
This is correct! :)
How many grams are in a mole of hydrogen chloride (hcl)? 1 h 1.01 hydrogen 17 cl 35.45 chlorine a. 1.5 grams/mole b. 35.45 grams/mole c. 36.46 grams/mole d. 72.92 grams/mole
The molecular mass is the sum of the atomic masses of the atoms.
Atomic mass :
H = 1.01 amu
Cl = 35.45 amu
HCl = 1.01 + 35.45
HCl = 36.46 grams/mole
Therefore:
1 mole of HCl is equivalent to 36.46 grams/ mole
answer C
What word or two-word phrase best describes the shape of the fluoroform molecule?
The two-word phrase that best describes the shape of the fluoroform molecule is ; Tetrahedral
Fluoroform is a chemical compound represented by the formula CHF₃ which falls within the class of haloforms. The center atom in a fluoroform molecule is the carbon atom which has ( 3 ) C - F bonding and ( 1 ) C - H bonding. This means that the number of electrons is in a fluorocarbon is 4, hence according to VSEPR theory the geometry of the fluoroform molecule will be Tetrahedral.
Hence we can conclude that The two-word phrase that best describes the shape of the fluoroform molecule is ; Tetrahedral
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The shape of the fluoroform molecule is trigonal pyramidal.
Explanation:The shape of the fluoroform molecule is trigonal pyramidal.
A trigonal pyramidal shape occurs when a central atom is bonded to three other atoms and has one lone pair of electrons. In the case of fluoroform (CHCl3), the central carbon atom is bonded to three fluorine atoms and has one lone pair of electrons, resulting in a trigonal pyramidal shape.
Other examples of molecules with trigonal pyramidal shape include ammonia (NH3) and phosphine (PH3).
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