The answer is 4.02.
Benzoic acid is a weak acid and sodium hydroxide is a strong base. Benzoic acid and sodium hydroxide react to form sodium acetate and water to form a buffer solution. pH can be measured by measuring the voltage developed between two special electrodes immersed in a liquid solution.
Special glass electrodes are called measuring electrodes. It neutralizes benzoic acid to produce benzoate ions, which enter the water layer, leaving two other organic compounds in the ether. Similarly, nitroaniline does not dissolve under neutral or basic conditions but dissolves in acidic solutions. This clearly shows that formic acid is a stronger acid than benzoic acid.
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Name the following bonds:
1. calcium
2. rubidium iodide
3. nickel (IV) selenide
Answer:
Ionic bondIonic bondIonic bondExplanation:
1) Calcium = ?
→ Ca will constitute to form ionic bond.
2) Rubidium iodide = ?
→ Rubidium iodide will form ionic bond.
3) Nickel (IV) selenide = ?
→ Nickel (IV) selenide forms ionic bond.
you weighed out .50 g of zinc chloride salt instead of the .32 g required for the experiment. how will this effect the empirical formula obtained?
You weighed out 0.50 g of zinc chloride salt instead of the 0.32 g required for the experiment. it will not affect the empirical formula obtained.
The empirical formula is calculated by the number of moles of substances. if we increase the number of mass of zinc chloride it will increase the number of moles of zinc and the chlorine. that would divide the number of moles to obtain the ratio. so, by increasing the weight of zinc chloride there will be no effect in the empirical formula . they will remain in same proportion.
Thus, You weighed out .50 g of zinc chloride salt instead of the .32 g required for the experiment. it will not affect the empirical formula obtained.
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Which object will have the smallest change in motion when an equal force is applied?
8 kg circle
6 kg square
4 kg triangle
5 kg rectangle
The object will have the smallest change in motion when an equal force is applied is 8kg circle.
What is force?A force is described as an influence that can change the motion of an object.
A force can cause an object with mass to change its velocity or to change its acceleration. Force can also be described intuitively as a push or a pull. A force has both magnitude and direction, making it a vector quantity.
The object will have the smallest change in motion when an equal force is applied is 8kg circle because according to Newton's second law which states that the rate of change of momentum of an object is directly proportional to the net force acting on it, provided that the mass of the body is kept constant.
This means that as mass increases, force will increase. However, if acceleration is negative, then force will just increase by the same amount in the opposite direction.
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what is the volume (in l) of a scuba tank if it takes 2000l of air collected at 1.00 atm to fill the tank to a pressure of 150 atm? assume n and t are constant
The volume of the air collected at the pressure of 150 atm is 13.33 litres.
The ideal gas equation says,
The pressure P, the volume V, the number of moles n, the gas constant R and the temperature t of the gas are related with each other as,
PV = nRT
If the number of moles and the temperature are constant,
PV = Constant
So, we can write,
P₁V₁ = P₂V₂
P₁ is the pressure of the scuba tank is 1 atm and the volume V₁ of the scuba tank is 2000L while P₂ is pressure of the other tank is 150 atm. Hence we can write,
2000 x 1 = V₂ x 150
V₂ = 13.33 Liters.
So, the volume of the air is 13.33 litres
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A car travels 45 km at a speed of 60 km/h. How long does it take the car
to reach its destination?
Answer:
45 mins
Explanation:
it takes 45 minutes long
What does the Law of Electric Charges state?
Answer:
Things that are negatively charged and things that are positively charged pull on (attract) each other. This makes electrons and protons stick together to form atoms. Things that have the same charge push each other away (they repel each other). This is called the Law of Charges.
Explanation:
According to Coulomb, the electric force for charges at rest has the following properties: Like charges repel each other; unlike charges attract. Thus, two negative charges repel one another, while a positive charge attracts a negative charge.
Answer:
Like charges repel each other; unlike charges attract.
Explanation:
why are buffer solutions used to calibrate the ph meters rather than dilute solutions of acids and bases of known concentration?
Buffer solutions are used to calibrate pH meters because they resist changes in pH. When you use a pH meter to measure pH, you want to be sure that if the meter says pH = 7.00, the pH really is 7.00. So you use solutions of known pH and adjust the meter to display those values.
What is buffer solution
When modest amounts of an acid or an alkali are introduced, the pH of a buffer solution will not change.
solutions for buffering acid
Simply said, an acidic buffer solution is one that has a pH lower than 7. A weak acid and one of its salts, frequently a sodium salt, are typically used to create acidic buffer solutionsEthanoic acid and sodium ethanoate in solution would be a typical example. The solution in this instance would have a pH of 4.76 if the acid and salt were present in equal molar amounts.
However the concentrations were, as long as they were the same, it wouldn't matter.
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What will you do if a polyatomic ion is included in the ionic formula
The number of ionic compounds grows dramatically
what is polyatomic ion?
A polyatomic ion, also referred as a molecular ion, is a covalently bound set of two or more atoms or a metal complex that behaves as a single unit and has a net charge that is more than zero. Depending on the meaning, the phrase molecule may or may not be used to describe to a polyatomic ion. In Greek, the word poly- means "many," however even ions of two atoms are generally marked as polyatomic.
when polyatomic ions are added. Polyatomic ions are present in the majority of ionic substances. Sodium hydroxide (NaOH), which includes the polyatomic anion OH-, calcium carbonate (CaCO3), and ammonium nitrate (NH4NO3), which contains two polyatomic ions: NH+ and NO3-, are well-known examples.
The following table contains a list of the more significant polyatomic ions, which may be used as a reference when studying about polyatomic ion charges. A large number of them are oxyanions (polyatomic ions that contain oxygen)
Charge Name Formula
-3 Phosphate PO43-
Arsenate AsO43-
-2 Carbonate CO32-
Peroxide O22-
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a bag containing 0 oc ice is much more effective in absorbing energy than one containing the same amount of 0 oc water. (a) how much heat transfer is necessary to raise the temperature of 0.800 kg of water from 0 oc to 30.0 oc? (b) how much heat transfer is required to first melt 0.800 kg of 0 oc ice and then raise its temperature?
a)100464 J is the heat necessary to raise the temperature of 0.800kg of water from 0°C to 30°C .
b)125847.2x10³ J is the heat required to first melt and then raise the temperature of ice from 0°C to 30°C .
a)The concept of heat transfer which is a part of thermal properties of fluids that deals with melting, evaporation and sublimation is a prominent topic of discussion for physicists and chemists across the world. This particular concept is thus applied to solve the given question by the formula
Q=ms(ΔT)
m=mass of water
s=specific heat of water=4186 J/kg or 4.186 cal/g
Specific heat of water is the heat required to raise the temperature of 1kg water by 1°C.
T=change in temperature
=0.800 x 4186 J/kg x (30°C-0°C)
=100464 J
b) For melting and raising temperature;
Q=mLf + ms(Δ)T
Here,Lf is latent heat of fusion which is the heat required to convert solid into liquid i.e. 334 kJ/kg .
=0.800kg x 334 kJ/kg x (30°C-0°C)
=125847.2 x 10³ J
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Energy of an object due to the kinetic energy of its atoms is called...
Elastic
Thermal
Radiant
Chemical
Answer: thermal
Explanation: I remembered
molecular hydrogen effuses 4.0 times as fast as gas x at the same temperature. what is the molar mass of gas x?
The molar mass of gas x is 2.0g/mol.
Solution:
Molecular hydrogen effuses four times as fast as gas x at the same temperature
Oxygen is diatomic (O2)
Oxygen's molar mass = 32.0 g/mol.
Certain Gas = fast/light and Oxygen = slow/heavy
Set rate expression equal to the molar mass expression
[tex]\frac{4}{1}[/tex] = [tex]\sqrt{\frac{32}{x} }[/tex]
X = 2.0g/mol
Moles do not change with temperature because temperature affects volume, not mass. When a liquid or gas is heated, the molecules move faster, collide and spread. Since the molecules are distributed, they occupy more space. they are less dense. The opposite happens when a liquid or gas cools.
As the kinetic energy of the molecules in the gas increases, an increase in temperature causes the gas to expand, thus increasing in volume. When the same number of gas molecules occupy more volume, the density of air decreases. Volume is simply defined as the amount of space occupied by a three-dimensional solid.
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explain the differences between gel electrophoresis and column chromatography. address the principles behind each separation. why do large molecules migrate more easily in one method and with more difficulty in the other? which method generated the most precise results?
In the process of chromatography, the components of the sample are divided according to how evenly they disperse between a stationary phase and a mobile phase. Using using a variable rate of migration in an electric field, sample components are separated by electrophoresis.
The foundation of chromatography is the idea that mixtures of molecules applied to surfaces or solids, and fluid stationary phases (stable phases), separate from one another while moving with the help of a mobile phase.
The fundamental idea behind column chromatography is to use a stationary phase to help adsorb the solution's solutes before further separating the mixture into distinct components.
In gel electrophoresis the separation is by charge is to mass ratio and hence smaller molecules moves faster then larger molecules.
Chromatography generated the most precise results.
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How many total atoms are in 3Ba(NO3)2?
hydrocarbons are compounds that contain only carbon and hydrogen. combustion of a sample of a particular hydrocarbon gave 5.86 g of co2 and 1.37 g of h2o. what is the empirical formula of the hydrocarbon?
the emperical formula of the hydrocarbons was CH
what is emperical formula?
The simplest whole number ratio of atoms contained in a substance is its empirical formula in chemistry. The empirical formula of sulphur monoxide, abbreviated SO, and disulfur dioxide, abbreviated S2O2, are two straightforward examples of this idea. As a result, the empirical formula for sulphur monoxide and disulfur dioxide, two compounds made of sulphur and oxygen, is the same. Their molecular formulae, which represent how many atoms are present in each molecule of a chemical compound, are different.
It's important to remember that you're dealing with a hydrocarbon in this situation, which is a chemical made up solely of carbon and hydrogen.
As you can see, the byproducts of this combustion reaction are carbon dioxide, CO2, and water, H2O.
As a result, all the carbon that was formerly a component of the hydrocarbon will now be a component of the carbon dioxide. Similar to how all of the hydrogen that originally made up the hydrocarbon is now a component of the water.
This means that you can calculate the initial amounts of carbon and hydrogen in the hydrocarbon by counting the moles of water and carbon dioxide, respectively.
So, for water you have
1.37g x 1mole H2o/18.015 =0.076moles H2o
and for carbon dioxide
5.86g x 1 mole CO2/44.01g=0.133 moles CO2
Now, you know that every mole of water contains 2 moles of hydrogen and 1 mole of oxygen, which means that the reaction produced
0.076moles H2O x 2 moles H1/mole H2O=0.152 moles H
SInce every mole of carbon dioxide contains 1 mole of carbon and 2 moles of oxygen, it follows that the reaction also produced
0.133moles CO2 x 1 mole C/1mole CO2=0.133 moles C
Finally, to find the mole ratio that exists between carbon and hydrogen in the hydrocarbon, divide these values by the smallest one
For C: 0.133moles/0.133moles=1
For H: 0.152moles0.133moles=1.14≈1
The empirical formula of the hydrocarbon will thus be
C1H1⇒CH
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Explain how to
count the
number of atoms
in a molecule
that has
parentheses ()
around it?
The subscript outside of the parentheses in such a formula indicates that you must multiply it by the number of atoms within to calculate the number of atoms.
How do atoms work?One or more electrons with negative charges surround the core nucleus of an atom, which is made up of all of them. One or more protons and neutrons, which are comparatively heavy particles, can be found in the positively charged nucleus. The fundamental units of matter are called atoms.
How are atoms created?It is made up of neutrons, which have no charge, and protons, with a positive charge. All regular, naturally occurring atoms contain protons, neutrons, and the electrons that orbit them. These particles have a lengthy lifetime. Along with these three categories of particles, more subatomic particles might be present.
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the 2s and 2p sublevels are very close in energy, as are the 3s and 3p sublevels. explain how the orbital diagram for sodium confirms that the 3s sublevel is lower in energy than the 3p sublevel
The 2s and 2p sublevels are very close in energy, as are the 3s and 3p sublevels. The s sublevel is located lower on the page than the p sublevel.
Chemical bonds within substances contain energy. Exothermic reactions are those that release heat as well as chemical energy during the course of a reaction. The quantum theory defines a sublevel as an energy level. Sublevels in chemistry describe electron-related energies. Sublevels in physics can also refer to nuclear energy levels. A single orbital that can accommodate up to two electrons makes up the s-sublevel. Spherical best describes it. Since it is smaller than the 2s, which is smaller than the 3s, and so on, the 1s is the particle closest to the nucleus. 3 identical orbitals that resemble make up the p-sublevel.
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assume that after the first heating, your total mass of the crucible and contents is 1.76 g. after the second heating, the total mass is 1.77 g. what choice best describes what is happening with your reaction?
The total mass of the crucible and contents is 1.76g.It becomes 1.77g after the second heating. Here the decomposition reaction occurs.
Crucible is a metal container in which the substances are subjected to very high temperature.Decomposition reaction is the reaction in which a molecule breaks down to form two or more components. All decomposition reactions are the reverse of a combination of reactions.one of the product of decomposition must be in the elemental state.All decomposition reactions are not redox reactions. By heating a crucible and a content using intense gas flame,the mass of the content of the crucible will increase to some extent.so,the mass is increased from 1.76g to 1.77g.
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what would be the effect on the melting point of a sample if it were not dried completely after filtering the recrystallized sample?
The melting point of the sample if it is not dried completely after filtering the recrystallized product will have a broad range and will occur at lower range than the actual value.
What is melting point?
Melting point is the temperature at which the solid form of a given substance changes to the liquid form at atmospheric pressure. It is important because, by using the physical property of a substance the substance can be identified.
The sharp range melting point of the substance indicates the purity of the substance. If the sample is not dried completely after recrystallisation, the melting point will have a broad range.
Therefore, if the sample given is not dried completely, it will be impure and the decreases the melting point of the substance. So the actual melting point of the substance cannot be determined.
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PLEASE HELPPP In the gas law formula PV-nRT, the P is the gas _______________. (1 pt)
*
1 point
power
pressure
population
moles
Answer:
pressure is the correct answer bud
What is the mass in gram of carbon atoms in 4.4g of C3H8 ?
Help ASAP
I'LL MARK BRAINLIEST
Suppose a man is sitting on a chair and exerting 100 N of force downward, while a spring beneath the chair exerts 150 N of force upward. If you assign a negative value to the downward force, what is the net force of this system? (1 point) O 50 kg O 50 N O 250 N -50 N
A man is sitting on a chair and exerting 100 N of force downward, while a spring beneath the chair exerts 150 N of force upward. The net force acting on the system is in the upward direction with a magnitude of 50N.
Force is the product of mass and acceleration which is dependent on the rate of change of momentum.
According to the given question,
Magnitude of force in the downward direction = 100N
Downward force = 100N
Magnitude of force in the upward direction = 150N
Upward force = -150N
Net force on the system = Upward force + Downward force
Net force on the system = -150N + 100N
Net force on the system = -50N
Hence, the net force acting on the system is in the upward direction with a magnitude of 50N.
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Answer: 50N
Explanation:
Identify the overall molecular dipole moment of water using a vector arrow.
The overall dipole moment of the water molecule is shown in the image attached.
What is dipole moment?We know that there is a dipole that exists in a molecule when there is an electronegativity difference between the atoms that are in the molecule. In the case of the water molecule, there is an electronegativity difference that exists between the atoms of the water molecule.
Now, hydrogen is the positive end of the dipole and the oxygen is the negative end of the dipole. We have seen the structures of the dipole moment. Now, the overall dipole moment of the water molecule is shown in the image attached.
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If a ball begins rolling up a ramp with 200 J of kinetic energy how much potential energy will it have at the top of the ramp when it stops 
If a ball has 200 J of kinetic energy when it starts rolling up a ramp, it will also have 200 J of potential energy when it stops rolling up the ramp. Energy overall is constant.
What are kinetic energy and potential energy?
The energy that's also stored in any object as well as system as a result of the its position or component arrangement is known as potential energy. The object or system is unaffected by external factors like air pressure or altitude. Kinetic energy, on the other hand, describes the power of moving particles within a system or an object. In contrast to potential energy, which is independent of other fixed and moving objects in its immediate vicinity, kinetic energy is related to those objects. For instance, the object's kinetic energy would be higher if it is placed at a higher height. Potential energy varies with object mass, height, as well as distance and is not transferable. Kinetic energy can be transferred from a moving
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in the lichen experiment, the metal cations bound to the the lichen disk surface, and the methylene blue dye was leached into the solution question 7 options: true false
False; after coming into contact with metal cations, methylene blue solution leaches out of the lichens. Because they can accept electrons, metal cations are very electronegative.
Methylene, often known as carbene, is an organic molecule having the chemical formula CH 2 that is also formally known as methylidene and hydrocarbon (also written [CH 2]). It is a colourless gas that only persists in diluted form or as an adduct, fluorescing in the mid-infrared range. The most fundamental carbene is methylene.
A lichen is a symbiotic association between many organisms, such as a cyanobacterium or an algae. In addition to being unique from algae, cyanobacteria are also known as blue-green lichen.
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From each of the following ion concentrations in a solution, predict whether a precipitate will form in the solution. (Hint: Calculate Q and compare Q to Ksp)
a) [Ba2+] = 0.020 M, [F-] = 0.015 M Ksp= 1.0x10-6
BaF2(s) Ba2+(aq) + 2F-(aq)
b) [Pb2+] = 0.035 M, [Cl-] = 0.15M Ksp= 1.6x10-5
PbCl2(s) Pb2+(aq) + 2Cl-(aq)
If the ionic constant Q is greater than Ksp the solution forms precipitate if it is lower than the solubility constant Ksp then there will be no precipitate. Both of the given solutions forms precipitate.
What is ionic constant?The ionic constant Q of a solution is the product of molar concentrations of reactants. Solubility constant Ksp is the product of solubilities of the reactant ions when the reaction is in equilibrium.
For the first solution Q = 0.020 M × 0.015M = 0.003.
Ksp = 0.000001. Hence, Q is greater than Ksp which means the solution forms precipitate of BaF₂.
For the second solution Q = 0.035 M × 0.15 M =0.0025.
This is greater than Ksp = 1.6 × 10⁻⁵. Hence, this solution forms a precipitate of PbCl₂.
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bystolic (shown below) is a pharmaceutical used to treat high blood pressure. what is the maximum number of stereoisomers possible for this structure?
the maximum number of sterioisomers that are possible for bystolic was about 10 sterioisomer
what is bystolic ?
Beta-blockers include Bystolic (Bistolic). It functions by enabling the heart to beat more gradually and weakly, reducing the volume of blood it pumps out, and thus reducing blood vessel pressure. This lessens the strain on the heart and lowers blood pressure while enhancing cardiac pumping efficiency. Additionally vasodilating, bystolic (Bistolic). It thereby prevents the muscles from contracting, keeping the blood vessels open. Blood can flow more freely as a result of relaxed blood vessels.
the maximum number of sterioisomers that are possible for the structure of bystolic drug was 10 sterioisomers
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Assignment: Identifying Types of Reactions
35 Points
1. Combustion reaction
2. Single displacement reaction
3. Neutralization reaction
4. Synthesis reaction
5. Decomposition reaction
6. Synthesis reaction
Types of reactionsThere are different types of chemical reactions. The type of reaction that corresponds to each chemical equation as shown in the image respectively are:
Combustion reaction: where substances burn in oxygen. In this case, the substance is a hydrocarbon and the products are carbon dioxide and water.Single displacement reaction: where an atom displaces another atom from a compound. In this case, Ca is displacing Mg from [tex]Mg(NO_2)_3[/tex]Neutralization reaction: a reaction involving an acid and a base to yield salt and water. Here, KOH is the base while HBr is the acid. KBr is the salt that is formed.Synthesis reaction: a reaction in which two or more atoms or molecules of atoms come together to form a compound. In this case, Na and O are the atoms.Decomposition reaction: where a compound breaks down into two or more smaller compounds or atoms. Here, MgO decomposes to Mg and O.Synthesis reaction: K and Cl combine to form KCl.More on types of reactions can be found here: https://brainly.com/question/14203092
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PLEASE HELP ASAP, DUE TODAY. (Also, an explanation would be helpful, but you don’t have to give one)
I don't know much but I hope I helped you even a little bit.
the electron configuration filling patterns of some elements in group 6b(6) and group 1b(11) reflect the of half-filled and completely filled sublevels. multiple choice question. decreased stability penetration scarcity increased stability
The electronic configuration packing patterns of some elements in group 6b(6) and group 1b(11) reflect the enhanced stability of half-filled and fully-filled sublevels. So option (c) is correct.
What is electronic configuration?The electronic configuration of an element describes how the electrons are distributed in its atomic orbitals. For example, the electron configuration of sodium is 1s²2s²2p⁶3s¹
The three rules that direct the manner in which electrons are to be filled in atomic orbitals are:
Aufbau principle: Electrons must completely fill the atomic orbitals of a given energy level before occupying an orbital of a higher energy level. Electrons fill orbitals in the increasing order of orbital energy level.
Pauli’s exclusion principle: It states that two electrons can never have equal values for all four quantum numbers. Also each subshell of an orbital can have a maximum of 2 electrons and both these electrons must have opposite spins.
Hund’s rule of maximum multiplicity: The subshells in an orbital must be singly occupied before it is doubly occupied. Furthermore, the spin of all the electrons in singly occupied subshells should be the same (to maximize the overall spin).
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Lit the following ubtance in order from lowet denity to highet denity:
iron, gold, teel, water, air, ilver, aluminum, gaoline
Answer:
1.water 2. air 3.aluminum 4.steel 5.iron 6.silver 7.gold
Explanation:
The density of iron is = 7.86 g/mL
The density of gold is = 19.3 g/mL
The density of steel is = 7.8 g/mL
The density of water is = 1.00 g/mL
The density of air is = 1.29 g/mL
The density of silver is = 10.5 g/mL
The density of aluminium is = 2.70 g/mL
so..
water < air < aluminum < steel < iron < silver < gold
