Marine science table 20-2

From the calculation that is based on the ICE table shown, the pH of the solution is  1.8.

Let us recall that the KNO2 is a salt of the nitrous acid. Our concern now would be on the nitrous ion and we are going to make up the ICE table from the following;

    NO2^-(aq) + H2O(l) ⇄  HNO2(aq) + OH^-(aq)

        HNO2 (aq) ⇄   H^+(aq) +  NO2^-(aq)

I        0.59                 0                0

C      -x                      +x               +x

E     0.59 -x             x                  x

Now we know that the Ka of HNO2 is 4.0x10^-4.

Ka = [H^+] [NO2^-]/[ HNO2]

4.0x10^-4 = x^2/0.59 -x

4.0x10^-4(0.59 -x) = x^2

2.36 x10^-4 - 4.0x10^-4x = x^2

x^2 +  4.0x10^-4x - 2.36 x10^-4  = 0

x=0.015

pH = -log(0.015)

pH = 1.8

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The average atomic mass of the fictitious element Az is 326.2 amu

The average atomic mass (on occasion referred to as atomic weight) of an element is the weighted average mass of the atoms in an obviously going-on sample of the element. average masses are typically expressed in unified atomic mass gadgets.

The atomic mass of detail is the common mass of the atoms of an element measured in the atomic mass units (AMU, also called daltons, D). The atomic mass is a weighted average of all of the isotopes of that element, in which the mass of every isotope is improved via the abundance of that specific isotope.

The atomic mass is a median of an element's atomic hundreds, weighted via the herbal abundance of each isotope of that detail. it is a weighted common because exclusive isotopes have one-of-a-kind hundreds. An atomic mass unit is 1/12th of the mass of a 12C atom.

Average atomic mass = Σ % abundance × mass

                                     = 325.2 × 7/9 +  329.6 × 2/9

                                      = 252.93 + 73.24

                                      = 326.17 amu

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speed of the electron  =  0.93*speed of light

                                   = 0.93*3.00 × [tex]10^{8}[/tex] m/s*(0.6214 mi/1 km)*(3600 s/hr)

                                   = 6.24X [tex]10^8[/tex] mi/hr

Speed is defined as the rate at which the position of an object changes in any direction.

There are four types of speed and they are:

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1) List the known and unknown quantities.

Sample: luminol.

Mass: 10.0 g.

Volume: 75.0 mL.

Molarity: unknown.

2) Set the equation.

3) Conversion of units.

3.1-Convert mass to moles.

The molar mass of luminol (C8H7N3O2) is 177.1601 g/mol.

3.2-Convert mL to L.

1 L = 1000 mL

4) Plug in the known quantities.

The molarity of the stock solution is 0.75 M C8H7N3O2.

.

Answer:

Criteria for spontaneity in terms of free energy change: (i) If ∆G is negative, the process is spontaneous. (ii) If ∆G is positive, the direct process is non-spontaneous. (iii) If ∆G is zero, the process is in equilibrium.

Answer:

Explanation:

Here, we want to balance the given chemical equation

We can start by balancing the oxygen atoms

We have 7 on the left and 2 on the right

To make a balance, we place 7 before the molecular oxygen on the left and 2 on the given oxide

That means we would be having 4 Rh on the left

To balance the Rh, we have to place 4 on the left side

Thus, we have the balanced equation as:

Answer:

it's the last one

Answer:

C3H6O3

Explanation:

It is one of the simplest molecules to compare against other molecules, such as sugars and amino acids.

Answer

d. They are very far apart and very energetic.

Explanation

The particles in the solid are touching with very little space between them. The particles in a liquid usually are still touching but there are some spaces between them. The gas particles have big distances between them.

Gas particles are in constant rapid motion in random directions. The fast motion of gas particles gives them a relatively large amount of kinetic energy.

Answer:

Thermal energy refers to the energy contained within a system that is responsible for its temperature. Heat is the flow of thermal energy. A whole branch of physics, thermodynamics, deals with how heat is transferred between different systems and how work is done in the process (see the 1ˢᵗ law of thermodynamics).

 Thermodynamics, and many other related fields, phase transitions are the physical processes of transition between a state of a medium, identified by some parameters, and another one, with different values of the parameters.

Periodic table give us a chart where we can see the elements in the increasing order of atomic number because of the repetition of the properties of the elements

Periodic table is a table in which we find elements with properties like metals, non metals, metalloids and radioactive element arranges in increasing atomic number.

Arrangements of element is done on the basis of atomic number not on the basis of mass number because on arranging on the basis of atomic number the properties of elements gets repeat due to the arrangement of electron around the nucleus.

Thus periodic table is arranged on the basis or atomic number not on the basis of mass number due to repetition of properties

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The thermal energy will affect the temperature of road and increase the temperature which causes cracks on the roads after some times. Thus the construction team must use temperature resistant material.  

Thermal energy is defined as internal energy present in a thermodynamically balanced system as a result of its temperature.

It can also be defined as the energy derived from matter's temperature.

There are three types of thermal energy transfer.

Thus, the  thermal energy will affect the temperature of road and increase the temperature which causes cracks on the roads after some times. Thus the construction team must use temperature resistant material.  

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Answer

[H+] = 7.94x10^-6 M

Explanation

Given:

pH = 5.1

Required: The concentration of H+

Solution

pH = -log[H+]

5.1 = - log [H+]

[H+] = 10^-5.1

[H+] = 7.94x10^-6 M

Nuclear energy produces electricity or electrical energy that can be used to power homes, schools, businesses, and hospitals.

A type of energy emitted by an atom's nucleus, which is composed of protons and neutrons, is known as nuclear energy. Fission, which occurs when atoms' nuclei split into numerous portions, and fusion, which occurs when nuclei fuse together, are the two methods in which this type of energy can be created.

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Answer:

Electrons are transferred from atoms of sodium to atoms of phosphorus. This transfer makes the sodium atoms positive and the phosphorus atoms negative. As a result, the sodium and phosphorus atoms strongly attract each other.

Explanation:

378mL is the volume of a 10% m/v aqueous solution that contains 37.8g of HN03

A solution in which the solvent is water is referred to as an aqueous solution. By adding (aq) to the appropriate chemical formula, it is typically shown in chemical equations. For instance, Na+(aq) + Cl would be used to represent a table salt solution (also known as sodium chloride, or NaCl) in water (aq).

The word aqueous, which derives from the Latin word aqua, means being or consisting of water. Water is a common solvent in chemistry because it works great as a solvent and is also readily available. In experiments, water is frequently used as the solvent; therefore, unless otherwise specified, the term "solution" refers to an aqueous solution.

The mass of HNO3 =  37.8g

The mass is 10% m/v of the solution which implies

10/100 = mass/ volume

Volume = 10mass

Volume = 10(37.8g)

Volume = 378mL

Thus, 378mL is the volume of a 10% m/v aqueous solution that contains 37.8g of HN03

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A cold air mass colliding with a hot air mass triggers the development of a tornado and is denoted as option D.

This is referred to as a violently rotating column of air and it is caused as a result of different types of factors such as the humidity , temperature etc.

A tornado is usually very violent and it is formed when cold air mass collides with a hot air mass and is often characterized by a green color in most situations and is therefore the reason why option D was chosen as the most appropriate choice.

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Answer:

A mixture is a combination of two or more substances in any proportions. The substances in a mixture do not combine chemically, so they retain their physical properties. A homogeneous mixture has the same composition throughout.

Explanation:

Equilibrium occurs in a reversible reaction. This occurs when in a reaction the products formed react to reproduce the reactants. So basically, the forward and reverse reaction occur at equal rates.

Answer:

The correct answer is B.

Considering the definition of molality, the molality of a solution that contain 82.6g of butane dissolved in 0.500kg of hexane is 2.84 moles/kg.

Molality is a measure of chemical concentration that indicates the amount of a substance dissolved in a given mass of solvent.

In other words, molality is the number of moles of solute that are dissolved in 1 kilogram of solvent.

The Molality of a solution is determined by the expression:

molality= number of moles of solute÷ kilograms of solvent

Molality is expressed in units moles/kg.

In this case, you know:

Replacing in the definition of molality:

molality= 1.42 moles÷ 0.500 kg

Solving:

molality= 2.84 moles/kg

Finally, the molality of the solution is 2.84 moles/kg.

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The percent by mass of potassium chlorate in the mixture is 62.46 %

Potassium chlorate is a compound containing potassium, chlorine and oxygen, with the molecular formulation KClO₃. In its natural form, it is a white crystalline substance. After sodium chlorate, it's far the second one maximum not unusual chlorate in commercial use.

Potassium chloride, also referred to as potassium salt, is used as a medicine to treat and prevent low blood potassium. Low blood potassium may also occur due to vomiting, diarrhea, or certain medications.

A aggregate is a material made of two or more extraordinary chemical materials which are not chemically bonded. A combination is the bodily aggregate of two or greater substances wherein the identities are retained and are combined in the shape of answers, suspensions and colloids

KClO₃ + KCl = 9.47 gram   ---------  sample before heating

KClO₃ + KCl = 7.11 gram      ----------  sample mass after heating

mass of oxygen = 9.47 - 7.11 = 2.36 gram

Therefore mass of KClO₃ in an mixture is = 7.11/2 + 2.36

                                                                     = 5.915 gram

Therefore, the percent by mass of potassium chlorate in the mixture = 5.915/9.47 × 100

= 62.46 %

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Taking into account the reaction stoichiometry, 65.32 grams of B₂H₆ will react with 7.1 mol of O₂.

In first place, the balanced reaction is:

B₂H₆ + 3 O₂ → B₂O₃ + 3 H₂O

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

The molar mass of the compounds is:

Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

The following rule of three can be applied: If by reaction stoichiometry 3 moles of O₂ react with 27.6 grams of B₂H₆, 7.1 moles of O₂ react with how much mass of B₂H₆?

mass of B₂H₆= (7.1 moles of O₂× 27.6 grams of B₂H₆)÷ 3 moles of O₂

mass of B₂H₆= 65.32 grams

Finally, 65.32 grams of B₂H₆ is required.

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The volume of 79.1 liters of oxygen (O₂) will be produced at a temperature of 370°C and 1520 torr if 2 moles of KClO₃ decompose.

The molar volume (Vm) is the volume occupied by 1 mole of a chemical element or a chemical compound at Standard Temperature and Pressure (STP). Molar gas volume is one mole at a specific temperature and pressure and has a fixed volume.

The Molar volume is inversely proportional to density and directly proportional to molar mass. One mole of any gas at STP occupies a volume of 22.4 liters.

Given, the 2moles of  KClO₃ will produce  O₂ gas = 3moles

The volume occupied by 3 moles of the oxygen gas at 370°C and 1520 torr is :

Given, n = 3, P = 1520 torr = 2atm and T = 370°C  = 643 K

PV = n RT

(2atm) V = (3)(0.082 atm L /K) (643K)

V =79.1 L

Therefore, the volume of oxygen gas produced will be equal to 79.1 Litres.

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If you've done stoichiometry already, it's easiest to do enthalpy problems like this in the same way where your ∆H is just part of the 'railroad tracks'.

-34.2 kJ (2 mol KClO3/-89.4 kJ) = 0.765 mol KClO3

The dose of the medicine per one kilogram of a body is 2.5 mg then , the dose of medicine required for 66 lb weight or 29.8 Kg is 74.5 mg.

Dose of a medicine is the amount of that medicine required to be taken for one time. It can be measured per Kg of body and the dose of medicine can be g or mg.

lb is a unit of weight. Generally we are using kilogram (Kg) unit of for kg. One lb weight = 0.453 kg.

Hence, 66 lb in kilogram weight is written as: 66 × 0.453 Kg = 29.8 Kg. The dose of medicine is 2.5 mg/kg which means, 2.5 mg is required for 1 Kg body.

The dose of the medicine required for 66 lb or 29.8 Kg is calculated by multiplying the dose required for 1 kg to the actual weight of the child as follows:

Dose =  29.8 × 2.5

         = 74.5 mg.

Thus, the child that weighs 66 lb or 29.8 kg is required to take the medicine of 74.5 mg dose.

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Non-renewable resources are resources found by humans as a source of energy and such resources cannot be replenished. Therefore such resources should not be wasted.

The earth is rich in resources. Some are unlimited others are inherently limited. Renewable resources are unlimited and can be replenished. However non-renewable resources are finite and must be used carefully to ensure long-term use for future generations. Wood is a renewable resource. This means you can grow additional resources in place of felled wood.

Non-renewable energy comes from resources that are depleted or not replenished over and over again throughout our lifetime. Most non-renewable energy sources are fossil fuels such as coal oil and natural gas. Carbon is the main element of fossil fuels. Air and water are also renewable natural resources. They don't grow like trees or have babies like animals. But they are constantly updated. They move cyclically.

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Explanation:

The use of pH indicators in the titration process is useful to determine the end point of the titration, indicating that the entire sample is reacted.

Answer: To show when the reaction has reached or past the equivalence point.

Answer

pH = 1.26

Explanation

If the [H3O+] of an aqueous solution is 0.055 M, then its pH can be calculated using the pH formula below.

The pH of an aqueous solution of 0.055 M is 1.26

Non-renewable resources are resources found by humans as a source of energy and such resources cannot be replenished. Therefore, such resources should not be wasted.

Nature is the epitome of beauty and grace but as humans grow up they forget the shining and uplifting virtues. People should use resources responsibly. Non-renewable resources come from the earth. The supply is finite and could take billions of years to replenish.

In the past, many non-renewable energies were relatively cheap to generate. However, as supplies continue to dwindle the cost of this extraction is likely to increase, prompting customers to turn to alternative power sources such as solar and wind. The most common examples of natural resources include crude oil coal uranium and mineral resources such as gold. A subset of non-renewable resources includes crude oil and natural gas. Both substances are made of organic carbon materials and change shape over time after being heated and compressed.

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Water vapor with a total mass of 10.29 g occupies 6.07 x 10⁻5 mL of volume.

Density of substance is defined as the mass of the substance per unit of its volume.

We know that,

Density of water vapor at 100°C and standard pressure is 5.9 x 10⁻⁴ g/cm³. To calculate volume, we will use the formula of density, which is -

density =   mass  

               volume

volume = mass x density

We know from the question that,

mass = 10.29 g

Substituting values in the equation,

volume = 10.29 x 5.9 x 10⁻⁴

volume = 6.07 x 10⁻⁵ mL

Hence, the volume occupied by the water vapor is 6.07 x 10⁻⁵ mL

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Step 1 - Converting ml and quart

As can be seen in the figure, the conversion factor is:

Dividing both sides by 1.057:

Step 2 - Converting 2.55 quart to ml

Now that we know the conversion factor, we just have to multiply both sides by 2.55:

There are thus 2412.47 ml in a 2.55 quart bottle pepsi.