a 2.34 l volume of aqueous solution contains 8.16 g of hydrogen bromide, hbr. calculate the molarity of the solution.

Answer:

C8H16

Explanation:

First thing to do here is to calculate the molar mass of the compound

Mathematically;

molar mass = mass/number of moles

we can calculate the number of moles using the ideal gas equation

Mathematically;

PV = nRT

n = PV/RT

where p is the pressure at 5 atm

V is the volume at 568 ml = 568/1000 = 0.568 L

R is the molar gas constant which is 0.0821

T is the temperature which is 120+ 273 = 393k

Inserting these values into the equation, we have

n = (5 * 0.568)/(0.0821 * 393)

n = 0.088 moles

So the molar mass = 10/0.088

= 114 g/mol

Now let’s go to the percentages

C = 84.2/12 = 7.016666666666667

H = 15.8/1 = 15.8

divide by the smallest

C = 7.016666666666667/7.016666666666667 = 1

H = 15.8/7.016666666666667 = 2 approximately

The empirical formula is CH2

So for the molecular formula, we have;

(12 + 2)n = 114

14n = 114

n = 114/14 = approximately 8

So the molecular formula of the liquid will be (CH2)n = C8H16

The volume of water added to dissolve potassium hydrogen phthalate (KHP) does not matter because the mass of KHP used is known and it will dissolve completely in any volume of water.

In volumetric analysis, the primary objective is to find the exact concentration of an analyte in a given solution. Analyte refers to the substance whose concentration is to be determined.In order to measure the analyte concentration, the known volume of the titrant of known concentration is added to the analyte until the endpoint is reached.Endpoint refers to the point in a titration where the reaction between the analyte and titrant is complete. The endpoint can be detected by observing a physical change in the system.In the case of KHP, it dissolves completely in any volume of water.

Therefore, the mass of KHP used can be accurately measured and dissolved in any volume of water. As a result, the volume of water added to dissolve the KHP does not affect the accuracy of the experiment.In summary, the volume of water added to dissolve KHP does not matter because the mass of KHP used is known and it will dissolve completely in any volume of water.

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Answer:

The brain stem

Explanation:

Answer:

hfufhdufdhfdufhdufhdudf

Explanation:

ring a bell?

Answer:

the energy levels and orbitals the electrons are in

Explanation:

i just took the test :)

The energy levels and orbitals the electrons are in. Hence, option D is correct.

An atom contains a central nucleus surrounded by one or more electrons.

The quantum numbers of electrons represent the probable distance of the electron from the nucleus. It refers to the size of the orbital and the energy level an electron is placed in.

Hence, option D is correct.

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The statement "you're letting the cold in" is technically false. When you open a door on a cold winter night, you are allowing the warm air inside to escape, which can cause a drop in temperature. However, you are not necessarily "letting the cold in." The cold air is already present outside, and it will continue to exist whether the door is open or closed. In fact, the temperature inside your home may only change slightly, and it will depend on many factors such as the size of the room, the amount of insulation, and the efficiency of the heating system.

The concept of heat transfer, which is the movement of heat from one place to another, helps explain why this statement is false. When you open the door, the warm air inside will move to the cold air outside, which is known as conduction. This transfer of heat will cause the temperature inside to drop until the heat source can warm up the air again. This process will continue as long as the door remains open. So, while opening the door on a cold winter night can cause a drop in temperature, it is not because you are "letting the cold in." Instead, it is because you are allowing the warm air inside to escape.

The group number tells you the total number of electrons present in the outermost orbit of an atom. In other words, group number tells you the number of valence electrons of an atom.

An empirical formula represents the simplest ratio of atoms present in a compound. To determine the empirical formula, we need to simplify the given formulas to their simplest ratios.

Let's analyze the options:

A) CH2OHCH2OH: This formula can be simplified to C2H6O2. However, it is not in its simplest ratio, so it is not an empirical formula.

B) H2C204: This formula is already in its simplest ratio, so it is an empirical formula.

C) H2CO3: This formula is also already in its simplest ratio, so it is an empirical formula.

D) CH3COOH: This formula can be simplified to C2H4O2. However, it is not in its simplest ratio, so it is not an empirical formula.

Therefore, the empirical formulas among the given options are B) H2C204 and C) H2CO3.

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The Breadknife is made-up of  trachyte.

The rock formation is composed of volcanic rock known as trachyte. Trachyte is a type of igneous rock that is typically light in color, fine-grained, and contains large crystals of feldspar. The trachyte that makes up the Breadknife is believed to have formed about 17 million years ago during the Miocene Epoch, through the cooling and solidification of magma that rose to the surface.

The unique shape of the Breadknife is due to the erosion of the surrounding softer sedimentary rock, which has left the harder trachyte exposed as a narrow ridge with steep sides.

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Answer:

Explanation:

i got D

Convert the mass of anhydrate to moles: Mass of anhydrate / Molar mass anhydrate =120.4g / 120.4g/mol = 1 mole MgSO4.

One of a body's fundamental properties is its mass. In spite of having the same amount of matter in theory, different atoms and elementary particles have been found to have different masses.

In modern physics, there are a number of conceptually distinct but physically equivalent conceptions of mass. Experimentally, the body's resistance to acceleration (change in velocity) in the presence of a net force can be quantified as mass, which is the same as inertia. The mass of the object affects the gravitational pull it exerts on other bodies.

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Density is defined as the mass per unit volume of a substance. The formula for density is: density = mass / volume. Therefore, the density of the sample is 8 g/cm³.

Given that the mass of the material is 48 grams and the volume is 6 cubic centimeters, we can use the formula to calculate the density:

density = 48 g / 6 cm³

Simplifying the expression, we get:

density = 8 g/cm³

Therefore, the density of the sample is 8 g/cm³.

Density is a physical property of matter that describes how much mass is contained within a given volume of a substance. It is expressed in units of mass per unit volume, such as grams per cubic centimeter (g/cm³). In this example, we are given the mass of a material (48 grams) and its volume (6 cubic centimeters), and we can use the formula for density (density = mass / volume) to calculate its density. Plugging in the values, we get a density of 8 g/cm³, which means that 8 grams of the material occupy each cubic centimeter of space. The density of a material can provide important information about its properties, such as whether it will float or sink in a liquid, or how it will behave under different conditions.

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Answer:

B.

Explanation: Because it's at the bottom of the layer so it gets least sun and solar energy.

In chloroplasts, an electron transport chain pumps protons from the stroma to the thylakoid space.

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The electrons are then transferred to complex III, which also undergoes redox (reduction and oxidation) reactions immediately. This again creates a proton pump, pumping four protons from the matrix through complex III and directly into the mitochondrion's intermembranous space.

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molarity = moles of solute / liters of solution

M = 0.27 moles / 0.750 L

M = 0.36

b) 0.36 M

A major source of iodide in the North American diet is iodized salt. Iodized salt is regular table salt that has been fortified with iodine. The addition of iodine to salt was implemented as a public health measure to prevent iodine deficiency, which can lead to thyroid problems and other health issues.

Iodine is an essential nutrient required for the production of thyroid hormones. Since the body cannot produce iodine on its own, it must be obtained from the diet. In regions where iodine deficiency is prevalent, such as some areas of North America, iodized salt is commonly used to ensure an adequate intake of iodine.

By consuming iodized salt in cooking and food preparation, individuals can easily incorporate iodine into their diet. The iodine content in iodized salt is carefully regulated to provide a consistent and reliable source of iodine for the population.

Other dietary sources of iodine include seafood, seaweed, dairy products, and some fruits and vegetables; however, iodized salt remains one of the primary sources of iodine in the North American diet due to its widespread use and availability.

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Electrons are the negatively charged particles of an atom is true.

Electrons are a type of subatomic particle with a negative charge. Protons are a type of subatomic particle with a positive charge. Protons are bound together in an atom's nucleus as a result of the strong nuclear force. Neutrons are a type of subatomic particle with no charge (they're neutral).

Electrons are negatively charged particles that generally orbit the nucleus of an atom. Electrons are much smaller than protons or neutrons. The negative charge of electrons in the orbitals of an atom balances the positive charge of the protons in the atomic nucleus. They are extremely small compared to the total space of the atom.

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The standard oxidation potential (E°ox) of Metal X in Serge's cell is -0.685 V.

An electrode is an electrical conductor that can carry current into nonmetals and other poor conductors of electricity. An anode and a cathode are the two types of electrodes. The positively charged electrode is known as the anode, while the negatively charged electrode is known as the cathode.

The overall cell potential can be calculated as:

E°cell = E°reduction (cathode) - E°oxidation (anode)

E°reduction = standard reduction potentials of the cathode

E°oxidation = standard reduction potentials of the anode

Copper is the cathode in Serge's cell, and Metal X is the anode. As a result, the half-reactions that occur at the electrodes are:

Cathode (reduction): Cu^{2+}(aq) + 2e- → Cu(s) (E°red = 0.34 V)

Anode (oxidation): Metal X(s) → Xn+(aq) + ne- (E°ox)

The overall cell reaction is:

Cu^{2+}(aq) + Metal X(s) → Cu(s) + Xn+(aq) (E°cell = 1.025 V)

E°cell = E°reduction (cathode) - E°oxidation (anode)

1.025 V = 0.34 V - E°ox

E°ox = 0.34 V - 1.025 V

E°ox = -0.685 V

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The standard oxidation potential (E°ox) of Metal X in Serge's cell is -0.685 V.

An electrode is an electrical conductor that can carry current into nonmetals and other poor conductors of electricity. An anode and a cathode are the two types of electrodes. The positively charged electrode is known as the anode, while the negatively charged electrode is known as the cathode.

The overall cell potential can be calculated as:

E°cell = E°reduction (cathode) - E°oxidation (anode)

E°reduction = standard reduction potentials of the cathode

E°oxidation = standard reduction potentials of the anode

Copper is the cathode in Serge's cell, and Metal X is the anode. As a result, the half-reactions that occur at the electrodes are:

Cathode (reduction): Cu^{2+}(aq) + 2e- → Cu(s) (E°red = 0.34 V)

Anode (oxidation): Metal X(s) → Xn+(aq) + ne- (E°ox)

The overall cell reaction is:

Cu^{2+}(aq) + Metal X(s) → Cu(s) + Xn+(aq) (E°cell = 1.025 V)

E°cell = E°reduction (cathode) - E°oxidation (anode)

1.025 V = 0.34 V - E°ox

E°ox = 0.34 V - 1.025 V

E°ox = -0.685 V

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In a redox reaction, electron could be lost or gained. The coefficients in the balanced redox reaction are;  1/2, 5, 1, 5, 2, 1.

A redox reaction equation shows the species that were oxidized or reduced in a redox reaction. In this case, we are asked for the coefficients in a balanced redox reaction equation.

We must recall that five electrons were lost/gained in the process hence the balanced reaction equation is;

1/2I2 + 5HNO3 -----> IO3^- + 5NO2 + 2H2O + H^+

The coefficients in the balanced equation therefore are; 1/2, 5, 1, 5, 2, 1.

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The following redox equation is balanced with the smallest whole number coefficients, the coefficient for nitrogen dioxide will be 10.

In redox reaction, there is transfer of electrons between the species of the reactions.

The given redox reaction is

\(\rm I2 (s) + HNO_3 (aq) -- > HIO_3 (aq) + NO_2 (g) + H_2O\)

To find coefficient of the compounds of the reaction, there are coefficient calculator present.

Thus, the coefficient for nitrogen dioxide will be 10.

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In 310 g of magnesium ions (Mg²⁺), there are approximately 7.69 × 10²⁴ magnesium ions. This calculation involves converting the mass of magnesium ions to moles.

To determine the number of ions in 310 g of magnesium ions (Mg²⁺), we need to convert the mass of magnesium ions to the number of moles and then use Avogadro's number to calculate the number of ions.

The molar mass of magnesium (Mg) is approximately 24.31 g/mol.

Number of moles = Mass / Molar mass

              = 310 g / 24.31 g/mol

              = 12.75 mol (rounded to two decimal places)

There is one magnesium ion in one mole of magnesium ions (Mg²⁺).

Number of magnesium ions

= Number of moles × Avogadro's number × Number of ions per mole

= 12.75 mol × 6.022 × 10²³ ions/mol × 1 ion

≈ 7.69 × 10²⁴ magnesium ions

Therefore, there are approximately 7.69 × 10²⁴ magnesium ions in 310 g of magnesium ions (Mg²⁺).

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The bond order for any molecule having an equal number of bonding and antibonding electrons is zero.

The "degree" of the bond is best described by the bond order. For instance, the bond order of a triple bond is 3, while the bond order of double bond is 2. One can imagine that each electron contributes to the bonding or antibonding characteristic. Half of the bonding feature is contributed by each electron in a bonding molecular orbital. Half of the antibonding feature is contributed by each electron in an antibonding molecular orbital. Bond order is zero when bonding and antibonding character are equal. Therefore, the bond order is 0 when the number of bonding and antibonding electrons is equal.

Mathematical proof is also possible.

Bond Order: ½(Antibonding electrons - bonding electrons)

When both are equal. Suppose number of both electrons is x then,

Bond Order: ½(x – x) = 0

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Answer:

D or C.

Explanation:

Sorry if its wrong

Answer:

A. Rocks along the coast are broken up by waves crashing into the shore.

Explanation:

Answer: C

Explanation: Because I just did the test lol.

Chemicals are substances that can be natural or man-made. It can both hurt and help the environment as they pollute water and can also clean water. Thus, option C is correct.

Chemicals are compounds that are synthesized artificially and have various uses and applications in various fields. They can be both beneficial and detrimental to the environment and the ecosystem.

Chemicals like that from factories, pesticides run-off from agricultural fields, drugs, microorganisms, fertilizers, radioactive substances, etc, cause water pollution by acting as contaminants.

On the contrary, chemicals can be used to clean water pollution. Chloramine and chlorine are the most common chemical disinfectants that cleanse contaminated water to make it useful.

Therefore, option C. chemicals can both clean and pollute water.

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Answer:

K2S2O8

Explanation:

The method is attached above.

Answer:

A. To be precise, it must be able to make measurements repeatedly over a long period of time.

Explanation:

The precision of a scientific measuring tool can be defined as how close the values between multiple measurements are to each other, when repeated under the same conditions.

This ultimately implies that, the precision of a scientific measuring tool reflects the reproducibility and repeatability of its measurements, irrespective of how accurate the measurements are.

In science, one of the most effective ways to determine the precision of a scientific measuring tool is to find the difference between the highest and lowest measurements (measured values).

Hence, the statement which correctly describes a characteristic that a scientific measuring tool should have is that, to be precise, it must be able to make measurements repeatedly over a long period of time.

Uranium has a half life of 8 days. If 100g of uranium breaks down after 24 days, the uranium that will be left is 12.5g

The half-life of a radioactive substance is the amount of time it takes for half of a sample to decay. If the half-life of uranium is 8 days, then after 8 days, half of the original sample (100g) will have decayed, leaving 50g of uranium.

After 16 days, half of the remaining 50g will have decayed, leaving 25g.

After 24 days, half of the remaining 25g will have decayed, leaving 12.5g of uranium. So 12.5 g of uranium will be left.

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Answer:

The answer should have as many significant figures as the lowest number used in the multiplication, which is 1.2 .

The correct statement regarding the nucleus of an atom is that it contains protons and neutrons and has no charge.

The nucleus of an atom is the central part that contains most of the atom's mass. It is composed of protons and neutrons, which are collectively known as nucleons. Protons have a positive charge, while neutrons have no charge. Electrons, on the other hand, are found in the electron cloud surrounding the nucleus.

The correct statement regarding the nucleus of an atom is that it contains protons and neutrons and has no charge. This means that the positive charge of the protons is balanced by the equal number of negatively charged electrons in the electron cloud. The nucleus is held together by the strong nuclear force, which overcomes the electrostatic repulsion between the positively charged protons.

The number of protons in the nucleus determines the element's atomic number, while the total number of protons and neutrons determines the atomic mass.

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The ions are present in cations and anions.

The cathode Positively charged cations.

The anode is negative ions.

The oxidation occurs is Zn(s) = Zn2+ (aq) + (2e-).

A redox reaction combines two half-reactions into one complete formula. Electrons lost in the oxidation half-reaction are gained in the reduction half-reaction. Thus, a redox reaction is a chemical reaction in which electrons are transferred between the two species.

A substance that is reduced in a chemical reaction is called an oxidizing agent and a substance that is oxidized is called a reducing agent. Example of the redox reaction of zinc and copper. A reaction is complete when it reaches equilibrium, that is when the concentrations of reactants and products stop changing. If the equilibrium constant is very large.

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