Answers
Greetings! Hope this helps!
Answer
84 would be your answer
Have a good day!
_______________
A brainliest would help tons! :D
Related Questions
Which of the following molecules would you expect to have the highest boiling point?
1
O Molecule 3
O Molecule 1
O Molecule 4
O Molecule 2
2
3
OH
O
4
Answers
The highest boiling point based on the data is option 4
What is the highest boiling point?Compared to alcohols of comparable molecular weight, carboxylic acids often have higher boiling temperatures. Between the hydrogen atoms of adjacent molecules and the oxygen in the carboxyl group of carboxylic acids, strong intermolecular hydrogen bonds can develop. Because it takes more energy to break the intermolecular interactions and change the substance from a liquid to a gas during boiling, these hydrogen bonds help materials have higher boiling temperatures.
Although carboxylic acids and alcohols are both capable of forming hydrogen bonds, carboxylic acids have higher boiling temperatures due to the extra carboxyl group that they contain.
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The vertical axis of a graph shows the
Answers
Answer:
The horizontal axis represents years and the vertical axis represents units of sales. The graph presents both the increase and decline in sales for both products, as sales fluctuated during the ten-year period.
Explanation:
Question 8 (2 points)
3
Use the following equation and information to answer the question that follows
2 H3PO4 -> 1 P2O5 + 3 H2O
6
9
Chemical Molar Mass (g/mol)
H3PO4 97.93 g/mol
P2O5 141.94 g/mol
H20 18.02 g/mol
How many moles of H3PO4 will are needed to produce 0.393 mol of H20
Your Answer:
Answer
units
Answers
Zeros between nonzero digits are significant
Answers
Answer:
Explanation:
If a zero is found between significant digits, it is significant
The literature values listed for the unknowns in this assignment are from either the Merck Index or the CRC Handbook, the two most used reference handbooks. However, the values tend to vary slightly across literature sources and sometimes the temperatures are given as ranges. Give at least one reason for the variations in these reported temperatures.
In general, the boiling points of compounds increase down a group in the periodic table. The melting points and boiling points for the hydrogen compounds of group 6A elements are in the table below.
Melting point (0C) Boiling point (oC)
H2O 0.0 100.0
H2S -82.0 -60.0
H2Se -65.7 -41.2
H2Te -49.0 -2.2
Answers
Answer:
See explanation
Explanation:
One of the important trends in the periodic table is electronegativity. Electro negativity decreases down the group and increases across the period. This trend has important consequences on the observed properties of the compounds of elements in a particular group in the periodic table.
As we move down in group 6A, the electro negativity of the elements elements the group decrease and as such, the magnitude of intermolecular hydrogen bonding between the molecules also decrease accordingly. Hydrogen bonds occur between
molecules of a substance when hydrogen is covalently bonded to an electronegative element. Hydrogen bonding is responsible for the high melting and boiling points of small molecules such as water which contain the highly electronegative oxygen atom.
So, as we move down the group there is lesser intermolecular hydrogen bonding between the hydride molecules of group 6A elements resulting in the observed trend in melting and boiling points of the hydrides.
The weaker hydrogen bonds that occurbetween molecules of group 6A hydrides lead to a steady decrease in melting and boiling points of the hydrides of group 6A elements as we move down the group.
4FeS(s)+7O2(g)→2Fe2O3(s)+4SO2(g)
Due to the presence of FeS(s) as an impurity, the combustion of some types of coal results in the formation of SO2(g), as represented by the equation above. Also, SO2(g) can react with O3(g) to form SO3(g), as represented by the equation below.
SO2(g)+O3(g)⇄SO3(g)+O2(g)
∆H∘298=−242kJ/molrxn;∆S∘298=−25J/(K⋅molrxn)
Question
Which of the following is most likely to be true about the reaction between SO2(g)
and O3(g) at 298 K?
a) ΔG°<0 and TΔS∘ is smaller in magnitude than ΔH∘
b) ΔG°<0 and TΔS∘ is larger in magnitude than ΔH∘
c) ΔG°>0 and TΔS∘is smaller in magnitude than ΔH∘
d) ΔG°>0 and TΔS∘ is larger in magnitude than ΔH∘
Answers
To determine the answer, we need to calculate the standard free energy change of the reaction using the equation ΔG° = -234.55 kJ/mol.
What is an enthalpy ?Enthalpy is a thermodynamic property of a system that expresses the heat energy involved in a process, as well as the work that may be done at a constant pressure. It is represented by the symbol "H" and is usually measured in units of Joules or Calories.
Enthalpy change (ΔH) is often used to describe the difference between the enthalpy of the reactants and the products in a chemical reaction. It can be either positive endothermic or negative exothermic, depending on whether heat is absorbed or released during the reaction.
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A 105 L container holds 32 mol of gas. How many moles of gas will
there be if 40 L of gas were removed?
Pls help!
Answers
To lower the chance of suffering from decompression sickness (the bends), scuba divers use a mixture of gases in their air tank (typically oxygen and nitrogen gas in recreational dives). Assuming no other gas is present besides oxygen and nitrogen, if the mole fraction of oxygen present is 0.21, what is the partial pressure of nitrogen gas if the total pressure is 111.7 atm
Answers
Answer: The partial pressure of nitrogen gas if the total pressure is 111.7 atm is 88.243 atm.
Explanation:
Given: Mole fraction of oxygen = 0.21
Total pressure = 111.7 atm
It is known that the sum of moles fractions is always equal to 1. So, mole fraction of nitrogen is calculated as follows.
Mole fraction of nitrogen + mole fraction of oxygen = 1
Mole fraction of nitrogen = 1 - mole fraction of oxygen
Mole fraction of nitrogen = 1 - 0.21
Mole fraction of nitrogen = 0.79
Now, formula used to calculate the partial pressure of nitrogen is as follows.
\(P_{N} = X_{N} \times P_{total}\)
where,
\(P_{N}\) = partial pressure of nitrogen
\(X_{N}\) = mole fraction of nitrogen
\(P_{total}\) = total pressure
Substitute the values into above formula as follows.
\(P_{N} = X_{N} \times P_{total}\\= 0.79 \times 111.7 atm\\= 88.243 atm\)
Thus, we can conclude that the partial pressure of nitrogen gas if the total pressure is 111.7 atm is 88.243 atm.
What is a nebula? ...........................
Answers
a cloud of gas and dust in outer space, visible in the night sky either as an indistinct bright patch or as a dark silhouette against other luminous matter.
a clouded spot on the cornea causing defective vision.
Hope this helped
Answer:
A cloud of gas and dust in outer space, visible in the night sky either as an indistinct bright patch or as a dark silhouette against other luminous matter.
Explanation:
The small, but important, energy differences between 3s, 3p, and 3d orbitals are due mainly to.
Answers
The small, but important, energy differences between 3s, 3p, and 3d orbitals are due mainly to Heisenberg uncertainty principle.
A small but important difference between 3s, 3p, and 3d are due mainly to the Heisenberg uncertainty principle. Their principal quantum number ones rule and the number of weapons that can hold the penetration effect.
An electron in the 3s orbital is more likely to be close to the nucleus than is an electron in the 3p orbital; an electron in the 3p orbital, in turn, has a greater probability of being close to the nucleus than does one in the 3d orbital.
Therefore, degenerate orbitals are those orbitals that have the same energy. As given in the above representation, 2s and 2p orbitals are degenerate; 3s, 3p and 3d orbitals are degenerate, and so on. The degeneracy of the orbitals breaks down in the case of multi-electron systems.
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A graduated cylinder was filled to 20.3 mL with water. A solid object weighing 73.05 g was immersed in the water, raising the meniscus of the water to 48.1 mL. Calculate the density of the solid object in g/mL.
Answers
The density of the solid object will be 2.63 g/mL
What is density?Density of objects = mass/volume.
Recall that an object will always displace its own volume when placed in a liquid.
Volume of the solid object = Cylinder reading after immersing the object in the water - cylinder reading before immersing the object in the water.
= 48.1 - 20.4
= 27.8 mL
Mass of the solid object = 73.05 g
Density of the object = 73.05/27.8
= 2.63 g/mL
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Sean plated an unknown metal onto his silver ring which initially weighed 1.4 g. He constructs an electrolytic cell using his ring as one of the electrodes. After running the cell, 0.022 moles of the unknown metal was plated onto his ring and the mass of the ring increased to 3.137 g. What is the atomic weight of the unknown metal in g/mol
Answers
Answer:
79 g/mol
Explanation:
Mass of unknown metal deposited = 3.137 g - 1.4 g = 1.737 g
Number of moles of metal deposited = 0.022 moles
Since;
Number of moles = reacting mass/molar mass
Molar mass = reacting mass/number of moles
Molar mass = 1.737 g/0.022 moles
Molar mass= 79 g/mol
what is the mass of solute dissolved in 10.0 g of 5.00% Sugar solution?
A. 0.900 g
B. 0.180 g
C. 10.0 g D. 0.500 g
E. 9.50 g
Answers
Answer:
0.5 g or D
Explanation:
what is the mass of solute dissolved in 10.0 g of 5.00% Sugar solution?
A. 0.900 g
B. 0.180 g
C. 10.0 g
D. 0.500 g
E. 9.50 g
5% of the solution is sugar
o 10 g of the solution will have 9.5 g H2O and 0.5 g of sugar
0.5 /(9.5 +0.5) = 0.5/10 = 0.05 = 5 PER HUNDRED = 5%
so 0.5 g or D
Classify each of the following values by the number of significant figures present in each. 8.314 J/mol-K 6.022x10 23 mol-1 12 mL 1.2 years 7.0 m2 50, cm 0,005 L 40.7 g 670.90 in 0.6258 mg 2.205 lb 3270 ft 90 m 5 significant 4 figuressignificant 3 figuressignificant 2 figuressignificant 1 figures
Answers
Answer:
5 significant figures: 670.90 in.
4 significant figures: 8.314 J/mol-K, 6.022x10 23 mol-1, 0.6258 mg, 2.205 lb and 3270 ft.
3 significant figures: 40.7 g.
2 significant figures: 12 mL, 1.2 years, 7.0 m2, 50, cm and 90 m.
1 significant figure: 0,005 L.
Explanation:
Hello,
In this case, we proceed as follows:
* 8.314 J/mol-K has 4 significant figures since 8, 3, 1 and 4 are significant (nonzero).
* 6.022x10 23 mol-1 has 4 significant figures since 6, 0, 2 and 2 are significant including the zero as it is at the right of the first nonzero digit (6).
* 12 mL has 2 significant figures since 1 and 2 are significant (nonzero).
* 1.2 years has 2 significant figures since 1 and 2 are significant (nonzero).
* 7.0 m2 has 2 significant figures since 1 and 2 are significant (nonzero).
* 50, cm has 2 significant figures since 1 and 2 are significant (nonzero).
* 0,005 L has 1 significant figure since 5 is the only nonzero digit.
* 40.7 g has 3 significant figures since 4, 0 and 7 are significant including the zero as it is at the right of the first nonzero digit (4).
* 670.90 in has 5 significant figures since 6, 7, 0, 9 and 0 are significant including the zeros as they are at the right of the first nonzero digit (6).
* 0.6258 mg has 4 significant figures since the first zero is at the left of the first nonzero digit, therefore, it is not included.
* 2.205 lb has 4 significant figures since 2, 2, 0 and 5 are significant including the zero as it is at the right of the first nonzero digit (2).
* 3270 ft has 4 significant figures since 3, 2, 7 and 0 are significant including the zero as it is at the right of the first nonzero digit (3).
* 90 m has 2 significant figures since 1 and 2 are significant (nonzero).
Regards.
Given the following equation: Mg + 2HCI → MgCl₂ + H₂
How many moles of H₂ can be produced by reacting 2 moles
of HCI?
Answers
Taking into account the reaction stoichiometry, 1 mole of H₂ can be produced by reacting 2 moles of HCI.
Reaction stoichiometryIn first place, the balanced reaction is:
Mg + 2 HCl → MgCl₂ + H₂
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:
Mg: 1 moleHCl: 2 molesMgCl₂: 1 moleH₂: 1 moleMoles of H₂ producedBy reaction stoichiometry 2 moles of HCl form 1 mole of H₂.
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which is an example of a colloid? a mixture that settles out, a mixture that scatters light, a mixture that is separated by filtration, or a salt and water mixture?
Answers
These substances have dispersed particles that are large enough to scatter light, making the beam visible. Therefore, out of the options provided, a mixture that scatters light is an example of a colloid. Option B)
A colloid is a type of mixture in which particles are dispersed throughout a medium, creating a homogeneous appearance. Unlike solutions, where the particles are completely dissolved, and suspensions, where the particles settle out, colloids have particles that are larger than those in solutions but smaller than those in suspensions. One characteristic of colloids is that they can scatter light due to the size of the particles. This scattering of light is known as the Tyndall effect. Examples of colloids include milk, fog, and aerosol sprays. These substances have dispersed particles that are large enough to scatter light, making the beam visible. Therefore, out of the options provided, a mixture that scatters light is an example of a colloid. Therefore option B) is correct
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Note Complete Question
which is an example of a colloid?
a mixture that settles out,
b mixture that scatters light,
c mixture that is separated by filtration,
d salt and water mixture?
6.3 gram of HNO3 as mass of nitrate
Answers
Moles of HNO 3
= 6.3/63 = 0.1 moles
HNO3 has 1 atom of H , 1 atom of N , 3 atoms of O
No of atoms = moles of molecule × atomicity of atom × avogadro number
No of atoms of H =0.1×1×6.023×10^23
= 6.023×10^22
No of atoms of N =0.1×1×6.023×10^23
= 6.023×10 ^22
No of atoms of O =0.1×3×6.023×10 ^23
= 18.069×10 ^22
The equation for the reaction between aqueous lead(II) nitrate and aqueous potassium iodide is shown
Pb(NO₃)₂(aq) + 2Kl(aq) → Pbl₂(s) + 2KNO₃(aq)
colourless colourless yellow colourless
Which method could be used to separate the products?
A chromatography
B crystallization
C distillation
D filtration
Answers
The method that can be used to separate the products of the reaction between aqueous lead(II) nitrate and aqueous potassium iodide is filtration (option D).
What is filtration?
Filtration is the mechanical separation of a liquid from the undissolved particles floating in it.
According to this question, a reaction occurs between aqueous lead (II) nitrate and aqueous potassium iodide as shown:
Pb(NO₃)₂(aq) + 2Kl(aq) → Pbl₂(s) + 2KNO₃(aq)
Based on the equation above, lead iodide is a solid product while pottasium nitrate is an aqueous solution.
Filtration is used to separate insoluble solid particles from liquid like the aqueous product, hence, it is a suitable separation technique.
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Critically discuss the refusal/unwillingness of some individuals to answer questions to put them by authorized Stats SA officials
Answers
People refuse to answer questions from authorized Stats SA officials because they don't want to reveal confidential information.
What does official stats refer to?An official Stats is an official who has the function of asking citizens for different information in order to establish general statistics for all citizens.
Why don't people answer your questions?Some people refuse to answer questions out of mistrust, because they don't want to share personal information.
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Silver is heated with oxygen to form silver oxide.o Write the formulaso Label the phaseso Balance the equation
Answers
Answer
Formulas: Ag₂O (silver oxide), oxygen (O₂ ), and elemental silver (Ag)
Equation with labeled phases
\(4Ag(s)+O_2(g)→\text{ }2Ag_2O\text{\lparen}s)\)Procedure
Silver oxide can be produced by allowing silver to react with oxygen at temperatures lower than its decomposition point (195 °C).
The chemical formula for silver oxide (product) is
Ag₂O
Where the reactants are molecular oxygen (O₂ )and elemental silver (Ag).
The chemical equation with labels will be
\(Ag(s)+O_2(g)→Ag_2O\text{\lparen}s)\)The final balanced equation is
\(4Ag(s)+O_2(g)→\text{ }2Ag_2O\text{\lparen}s)\)where you will find 4 silver atoms and 2 oxygen atoms in both reagents and products sides of the chemical equation.
Based on the Law of Conservation of Mass,
what mass of products form when baking
soda decomposes?
NaHCO3 → Na₂CO3 + H₂O + CO₂
25.00 g
Give your answer to the correct number of
significant figures.
(g) Sodium Chloride
?g
Enter
Answers
Based on the Law of Conservation of Mass, the mass of products form when baking soda decomposes is 168 g/mole.
What is law of conservation of mass?Law of conservation of mass is defined as chemical reactions and physical changes cannot build or remove mass in an isolated system. The mass of the reactants and products in a chemical reaction must equal each other according to the law of conservation of mass.
\(\rm 2NaHCO_3 \rightarrow Na_2CO_3 + H_2O + CO_2\)
Mass of baking soda = 2 x molar mass
Molar mass of NaHCO₃ = 84.007 g/mole
Mass of baking soda = 2 x 84.007 g/mole
Mass of baking soda = 168.014 g/mole ≅ 168 g/mole
Thus, based on the Law of Conservation of Mass, the mass of products form when baking soda decomposes is 168 g/mole.
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what is the density of a board dimensions are 5.54 cm x 10.6 cm X 199 cm and whose mass is 28.6kg
Answers
Answer:
\(d=2.44\ g/cm^3\)
Explanation:
Given that,
The dimensions of the board is 5.54 cm x 10.6 cm X 199 cm.
The mass of the board is 28.6 kg.
Since, 1 kg = 1000 grams
28.6 kg = 28.6 × 1000 g = 28600 grams
Density = mass/volume
So,
\(d=\dfrac{28600\ g}{(5.54\times 10.6\times 199)\ cm^3}\\\\d=2.44\ g/cm^3\)
So, the density of a board is \(2.44\ g/cm^3\).
With enough ____________,
_______________, and
__________, the original
sedimentary or igneous rock is
changed to ______________ rock.
Answers
Answer: with enough heat, pressure, and time, the original sedimentary or igneous rock is changed to metamorphic rock.
Explanation:
write the expression for kp the equilibrium constant for the reaction and determine its value at 898C
Answers
You need to know the reaction's standard enthalpy change, standard entropy change, and temperature in order to calculate the value of Kp at a specific temperature.
What does KP mean in chemical?The equilibrium constants for a perfect gaseous mixture are Kp and Kc. When equilibrium concentrations are represented in terms of atmospheric pressure and Kc is the equilibrium constant, Kp is the equilibrium constant utilized.
What do equilibrium constant and the law of chemical equilibrium mean?The equilibrium constant, as defined by the "Law of Chemical Equilibrium," is the ratio of product of product concentration to product of reactant concentration. The stoichiometric coefficient in the balanced chemical equation increases with each concentration term.
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Banff National Park has picturesque glacial lakes. Lake Louise has a surface area of
0.8 km2. How many square miles is this equivalent to? 1 square mile is equal to
2.59 square kilometers.
a) 0.23 sq miles
b) 959sq miles
Oc) 2,564 sq miles
d) 0.31 sq miles
Answers
The surface area of the Lake Louise in square miles is 0.31 sq. miles
What is Conversion ?Unit conversion is the process of converting the measurement of a given amount between various units, often by multiplicative conversion factors that alter the value of the measured quantity without altering its effects.
To create a unit conversion issue where one (or more) units cancel out until just the desired unit is left, follow these steps:
Find out what kind of unit you have.Determine the desired unit.Choose the proper unit conversion factor(s).unit cancellation and math computations (e.g., multiply, divide).The fundamental rule is to multiply when converting from a bigger unit to a smaller unit. Divide if you need to go from a smaller to a larger unit. You will reduce the number, and you are already aware that division is all about reducing numbers.
Given ,
2.59 sq kilometers is equivalent to 1 sq. mile
1 sq. kilometer = (1/2.59) sq. miles
0.8 sq kilometers is equivalent to (1/2.59)*0.8 = 0.31 sq miles
The surface area of the Lake Louise in square miles is 0.31 sq. miles
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The surface area of the Lake Louise in square miles is 0.31 sq. miles
What is Conversion ?Unit conversion is the process of converting the measurement of a given amount between various units, often by multiplicative conversion factors that alter the value of the measured quantity without altering its effects.
To create a unit conversion issue where one (or more) units cancel out until just the desired unit is left, follow these steps:
Find out what kind of unit you have.
Determine the desired unit.
Choose the proper unit conversion factor(s).
unit cancellation and math computations (e.g., multiply, divide).
The fundamental rule is to multiply when converting from a bigger unit to a smaller unit. Divide if you need to go from a smaller to a larger unit. You will reduce the number, and you are already aware that division is all about reducing numbers.
Given ,
2.59 sq kilometers is equivalent to 1 sq. mile
1 sq. kilometer = (1/2.59) sq. miles
0.8 sq kilometers is equivalent to (1/2.59)*0.8 = 0.31 sq miles
The surface area of the Lake Louise in square miles is 0.31 sq. miles
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Is calcium oxide a Element or compound or mixture?
Answers
Answer:
compound
Explanation:
Answer:
The answer is compound
Explanation:
Which of the following electron models is the one currently accepted by modern science?
A.) Dalton's Billiard Ball.
B.) Thomson's Plum Pudding Model.
C.) Schrodinger's Quantum Mechanical Model.
D.) Rutherford-Bohr Planetary Model.
Answers
C.) Schrodinger's Quantum Mechanical Model is the electron model currently accepted by modern science. This model is based on the principles of quantum mechanics, which describe the behavior of particles at the atomic and subatomic level.
What is Electron?
An electron is a subatomic particle that carries a negative electric charge. It is one of the three fundamental particles that make up atoms, along with protons and neutrons. Electrons are much smaller than protons and neutrons, and they orbit around the nucleus of an atom. Electrons play a crucial role in chemical reactions, since they determine the chemical properties of atoms and molecules.
It represents electrons as probability clouds or orbitals, rather than as discrete particles following classical trajectories. This model has been successful in explaining the behavior of electrons in atoms and molecules, and has led to many important discoveries in modern physics and chemistry.
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Which statement below correctly describes their relative atomic radii and first ionization energy when comparing Se and Br? The atomic radius for Se is larger than Br, and the first ionization energy for Se is greater than Br. The atomic radius for Br is larger than Se, and the first ionization energy for Bris greater than Se. The atomic radius for Se is larger than Br, and the first ionization energy for Br is greater than Se. The atomic radius for Br is larger than Se, and the first ionization energy for Se is greater than Br.
Answers
At has a higher initial ionisation energy than Br, while Br has a bigger atomic radius. Se has a bigger atomic radius than Br, and Br has a higher initial ionisation energy than Se.
How do atomic radii and ionisation energy relate to one another (i.e., what happens to ionisation energy as atomic radii grow)?The most loosely bound electron is further from the nucleus and thus easier to remove in bigger atoms. Hence, the ionisation energy should decrease as size (atomic radius) increases.
Why does ionisation energy rise across a period while decreasing down a group?This is because the outer electrons aren't bound as strongly because they are farther from the nucleus.
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A Se ion has a mass number of 77 and a charge of −2
. Determine the number of neutrons, protons, and electrons in this ion.
number of neutrons:
number of protons:
number of electrons:
Answers
Answer:
neutrons = 71
protons = 6
electrons = 6
Explanation:
Hope this works :)
Identify which balance was used to make each mass reading. 0.90 g Choose... 1.230 g Choose... 5.43 g Choose... 4.0000 g Choose... 6.539 g Choose...
Answers
The balance that can be used to measure a mass reading of 0.90 g will be a balance with ±0.01 g tolerance.
The mass reading balance used for measurement
1.230 g ±0.001 g tolerance
5.43g ±0.01 g tolerance
4.0000g ±0.0001 g tolerance
6.539g ±0.001 g tolerance
What is the tolerance of a balance?The tolerance of a balance is the number of decimal place values shown on the balance and it is the permissible limitations measured in grams, that a balance can tolerate.
Hence, depending on the decimal place value behind a mass reading will determine the balance used for measurement.From the given parameters:
The mass reading balance used for measurement
0.90 g ±0.01 g tolerance
1.230 g ±0.001 g tolerance
5.43g ±0.01 g tolerance
4.0000g ±0.0001 g tolerance
6.539g ±0.001 g tolerance
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