6. In order to prepare 50.0 mL of 0.100 M NaCl you will add _____ grams of NaCl to _____ mL of wate

1) Convert milliseconds to seconds.

1 s = 1000 ms

72 ms is equal to 0.072 s.

The percent abundance of the cannellini beans in this sample is : 18.8 %

The average weighted = 1.9 g

M1 = mass of black eyed peas = 1.3

M2 = mass of cannellini = 2.9

x = % abundance

weighted average is given = 1.9 g

applying the formula :

M1x + M2 (1-x) = average weighted

1.3 × x + 2.9 (1-x) = 1.9

x = 0.812

% abundance of black eyed peas = 81.2 %

% abundance of cannellini beans = (1-0.812) = 0.188 = 18.8 %

Thus, The percent abundance of the cannellini beans in this sample is : 18.8 %

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The analogy that best describes theories is that theories are like clay because they can be molded to fit changing opinions.

A theory is a thorough explanation of a scientific phenomenon that incorporates laws, hypotheses, and facts. For example, the gravitational field hypothesis explains why fruits fall from trees and astronauts float in space. A theory can be related to a clay as it can be moulded as per the observations. The more observations a theory anticipates, the more tests it passes, and the more facts it explains, the longer its core premises hold true.

A theory should be consistent with new data. If not, the theory is changed or abandoned. The more observations a theory anticipates, the more tests it passes, and the more facts it explains, the longer its core premises hold true.

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Answer:

The CDC estimates the total economic burden of prescription opioid misuse in the United States is $78.5 billion a year.

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Answer:

When electron jumps from lower energy orbit to higher energy orbit, energy is absorbed to make transition from lower energy orbit to higher energy orbit.

Explanation:

The reason why the Ionic and covalent bonds help arrange atoms into unique structures for proteins like hemoglobin is that the structure of a protein allows it to carry out its unique function.

The covalent bond is the kind of bond that exists between two atoms in which the electrons between the two atoms are shared. The electrons cloud of the bond lies between the two atoms. For the ionic bond, there is a transfer of the electrons from one atom to another. We ought to note that the transfer is  often from the metal to the non metal.

On the other hand, it should be noted that there are various kinds of bonding that are important to be able to keep the structure and the function of the protein. Aside from the covalent bonds that holds the atoms together, the ionic bonds could also be involved in the dipolar interactions that are responsible for the secondary structure of the protein.

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B. The structure of a protein allows it to carry out its unique function.

ur welcum

When Boat A and Boat B have the same mass, the kinetic energy of Boat A is 9 times the kinetic energy of Boat B.

The energy that an object has because of its motion is called kinetic energy. We must apply a force to accelerate an object. Work is done  in applying a force. After work has been done and energy is transferred to the object, then the object will be move with a new constant speed.

Let' m' be the mass of both boats A and B.

It is given in the question that velocity of Boat A is three times greater than that of Boat B. Let the velocity of boat B be X, Kinetic energy of boat A be K₁  and kinetic energy of boat B be K₂

Kinetic energy of Boat A is:

K₁ = 1/2 * (mV₁)^2

  =1/2 * m *3X^2

   =9(1/2*m*X^2)

Kinetic energy of Boat B is:

K₂ = 1/2 *m *V₂^2

     =1/2* m* X^2

K₂ = 1/2*m*X^2

This implies that ,K₁  = 9* K₂

Kinetic energy of Boat A is 9 times the kinetic energy of Boat B.

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The first step we have to follow to answer this question is to convert the given mass to moles using CaCO3 molar mass:

Now, use the following formula to find the volume of water needed to prepare the solution:

It means that 0.29L are needed.

96kPa. Option C is correct

According to Gay Lussac's law, the pressure of a given mass of gas is directly proportional to the temperature provided that the volume is constant. Mathematically:

Substituting the given parameters to determine the new pressure P2

Therefore the new pressure is 96kPa

4.094*10^23 moles of Al(CN)3

1 mole = 6.022*10^23 atoms

0.68 moles = x atoms

x = 4.094*10^23 atoms of Al(CN)3

Answer

Explanation

N2O3(g) ⇌ NO(g) + NO2(g); ΔH is negative

The reaction is exothermic (ΔH is negative), an increase in the temperature will force the equilibrium to the left, causing the system to absorb heat and thus partially offset the rise in temperature.

Therefore, the correct answer is:

d. The equilibrium between the two forms of the gas is disturbed at high temperatures.

The correct descriptions of the terms in the periodic table are as follows:

The periodic table is the table that arranges the elements in order of increasing atomic number into vertical columns called groups and horizontal rows called periods.

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Best describes how a filter can be used to sort materials is filters allow objects of a certain size to pass through, so if you know the size or size range of a certain component in a mixture, you can pass the entire mixture through a filter and sort out the component in that size range

Filtration can be defined as the mechanical or physical process used for the separation of one substance from another and such as solids, liquids, and gases, with the aid of an any medium and when the substances in a mixture have different particle sizes, they are separated by filtration and the mixture is poured through a sieve or filter and the smaller particles slip through the holes, but the larger particles do not

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When the moon is at point 2, it will be covering Florida, which will cause some areas of the earth to be dark while others will be light.

Earth, the third planet from the sun, is the only place in the known cosmos where the presence of life has been established. With a 3,959-mile radius, Earth is the fifth-largest planet in our solar system and the only one whose surface is known to have liquid water. Moreover, the names given to Earth are distinctive.

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The plant made in one day 0.54 moles of oxygen.

From the balanced equation for photosynthesis, we know that 6 moles of oxygen are produced when 1 mole of glucose is produced at the same time.

So, to calculate the amount of oxygen that a plant made in one day when it produced 0.090 moles of glucose, we can use a mathematical Rule of Three:

Finally, the plant made in one day 0.54 moles of oxygen.

Answer:

Which one ? can u put a question here?

If the partition is removed and the gases mix adiabatically and completely, the change in entropy is equal to 263 K.

What is entropy?

The measure of a system's chaos is called entropy. It is an extensive property of a thermodynamic system, which means that the amount of matter in the system affects how much it is worth. Entropy is frequently represented in equations by the letter S and is measured in joules per kelvin (JK%-1) or kg/m^2/s^-2K^-1. The entropy of a highly ordered system is low.

Lets assume nitrogen is an ideal gas with CV=5R/2

and assume argon is also an ideal gas with CV=3R/2

n₁=4 moles

n₂=2.5 moles

t₁ = 5°C,  in kelvin t₁= 5+273

t₁ = 278 K

t₂=1°C,  in kelvin t = 1+273

t₂= 273 K

u=пCVΔT

U(N₂)+U(Ar)=0

putting values:

4x(5R/2)x(T(final)-278) = 2.5x(3R/2)x(T(final)-273)

by simplifying:

T(final) = 263K

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Explanation:

The question gives us the following reaction:

Pb(NO3)2 + 2 KI ---> PbI2 + 2KNO3

The equation tells us that 2 moles of potassium iodide (KI) produce 1 mole of lead(II) iodide (PbI2).

So:

2 moles KI ---- 1 mole PbI2

5 moles KI ---- x moles

x = 2.5 moles

Now let's transform 2.5 moles of PbI2 into grams:

m = n*MM

MM of PbI2 = 461 g/mol

m = 2.5*461 = 1,152.5 g

Answer: alternative "D" 1.15 x 10^3 g

The ΔH°rxn for the reaction MgO(s) + CO2(g) à MgCO3(s) is -100. kJ mol-1.

What is enthalpy ?

Enthalpy is a property or state function that resembles energy; it has the same dimensions as energy and is therefore measured in joules or ergs. The value of enthalpy is solely dependent on the temperature, pressure, and composition of the system, not on its history.

Using ΔH° = ∑ΔfH°(products) – ∑ΔfH°(reactants), the enthalpy change is:

ΔH° = ΔfH°(MgCO3(s)) – [ΔfH°(MgO(s)) + ΔfH°(CO2(g))]

= (-1096 – [-394 -602]) kJ mol-1

= -100. kJ mol-1

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Since the reaction is 1:1, the limiting reactant is Zn and the excess reactant is S.

Mass in excess of S

So the answer is option b sulfur 0.407 g

Answer: Glass is see through

Explanation:

Answer: Glass shaped into lens can bend light that passes through it

        -  Hyperopia (far-sightedness) : When the eye focuses light behind of the retina.

        - Myopia (near-sightedness): When the eye focuses light in front of the eye.

According to the Le Chatlier's Principle, an equilibrium system will adapt to a change in temperature, volume, or the quantity of molecules in a reactant or product in order to reestablish balance.

The smallest unit of a substance that keeps its content and properties is a molecule, which is made up of two or more atoms linked together by chemical bonds. The building blocks of chemistry are molecules. A subscript with the atom count is placed after the element symbol to identify molecules.

When two or more molecules interact to create a brand-new product, a chemical reaction takes place. Reacting substances are referred to as reactants, whilst newly created substances are referred to as products.

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Answer

Explanation

If two molecules of mercury oxide decompose into 2 molecules of mercury and 1 molecule of oxygen gas, then the equation for the reaction is shown below

The pH of an aqueous solution that is 0.200 mol/L in NH₃ and 0.300 mol/L in NH₄Cl is 7.9.

We will use Henderson-Hasselbalch equation to calculate the pH. It is given by -

pH = pKa + log [base]

                         [acid]

We know that,

base is NH₃

acid is NH₄⁺

we will calculate molarity as-

NH₃ : 0.200/2 = 0.1 M

NH₄⁺ : 0.300/2 = 0.15 M

Now, we will find pKa by -

Kw = Ka . Kb

Ka = 1 x 10⁻¹⁴

       1.8 x 10⁻⁵

Ka = 5.5 x 10⁻¹⁰

pKa = -logKa

pKa = 9.25

Substituting the values in equation,

pH = 9.25 + log  [0.1]

                          [0.15]

pH = 7.9

Therefore, the pH is found to be 7.9.

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Answer

C) They're liquid solutions.

Explanation

An alloy is a mixture of metal with a second metal or other non-metal material. Airplanes, bicycles, and cooking pots are all usually made of different types of alloys. Examples of alloys include stainless steel, brass, bronze, brass, solder metal, pewter, and sterling silver.

Alloys can contain more than one metal so option A is not true.

Elements of an alloy do not combine through a chemical reaction. The mixing is generally done at a very high temperature where the elements and metals are melted, mixed, and left to cool; hence option B is not true.

Also, option D is not true because alloys are a mixture of metal with a second metal or other non-metal.

Hence, the best option is that all alloys are liquid solutions of metals and or other non-metals.

The correct answer is option C) They're liquid solutions.

All questions where they ask you about concentration or volume of a solution prepared with another solution can be solved using the following equation:

Where C1 is the concentration of the first solution, V1 is the volume of the first solution, C2 is the concentration of the second solution and V2 is the volume of the second solution. You only need to be careful to use the rigth units.

This particular question ask for the Volume of the second solution, V2. Then we need to solve for V2 in the previous equation:

The energy in Joules required to change 49.75 grams of liquid water from 95 Celsius to 105 Celsius is 2082.54J.

Energy is the ability to do work. The energy needed to heat a substance can be calculated using the following formula:

Q = mc∆T

Where;

According to this question, 49.75 grams of liquid water needs to be changed from 95 Celsius to 105 Celsius. The energy needed can be calculated as follows:

Q = 49.75 × 4.186 × (105 - 95)

Q = 2082.54J

Therefore, 2082.54J is the energy required to change the liquid water.

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Molarity or molar concentration is a measure of the concentration of a chemical species, of a solute in a solution, using as units, number of moles, and volume in liters. The formula for Molarity is:

M = n/V

Where:

n = number of moles, 1.7 moles

V = volume in Liters, 2.8 Liters

Now we add these values into the formula:

M = 1.7/2.8

M = 0.61

The Molarity is 0.61 M

The change in internal energy of the gas in the cylinder is +5000.84989kJ.

Energy is described as the quantitative property that is transferred to a body or to a physical system or simply the ability to do work.

The given parameters include:

q = +5001J (gained is +)

P =  750Torr ( 1atm /760 (Torr) = 0.987atm

w = −PΔV

w = −0.987atm(1.846L − 0.345L)

w = −1.481L • atm (101.325J/1atm)

w = −150.11J = −0.15011kJ

we know that

ΔU = w + q

ΔU = 5001kJ − 0.15011kJ = +5000.84989kJ (The positive sign denotes that system increased in internal energy)

The first law of thermodynamics dealt on energy and explained that

Energy is conserved and under normal circumstances, the total amount of energy is constant. It is difficult to measure total energy within a system because there are so many different forms of energy, but we can measure energy changes.

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Answer:

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