Given that the concentration of ascorbic acid is ~0.001 M in lemon juice, is this error significant? Why or why not?

Answer:

dt=20.08

Explanation:

Q=msdt

840=10*4.184*dt

dt=840/(10*4.184)

dt=20.08

The student's approximate percent deviation or percentage of error in the measurement of the mass of the sample is 9.38 %.

Percent deviation is calculated to determine the accuracy of data collected during an experiment by comparing it to the theoretical results. Percent deviation is commonly used to check for data errors in student experiments.

Percent deviation can be referred to how much measured data differs from a known or theoretical value. A negative percent deviation indicates that the measured data is lower than the theoretical value. A positive percent deviation shows that the measured value is higher.

Given the actual value of the mass = 16 g

The calculated or approx value by student = 17.5 g

The percentage deviation = [(Approx - actual)/ actual ] × 100

                                              = [(17.5 - 16)/16] × 100

               Percentage error  = 9.38 %

Therefore, the student's approximate percent deviation is 9.38 %.

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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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So, the number of particles in a mole is about 80,000 the number of grains of sand on Earth’s beaches.

How to slove and Compare the value you calculated for the number of sand grains on Earth's beaches to the number of particles In mole?

Using sand grains that take up space of 1 mm, when these sand grains are laid side by side, there are about 1000 grains of sand per m, 1000000 per square m and 1000 × 1000 × 1000 per cubic m.

That is 10⁹ grains of sand per cubic meter.

An average beach has sand volume of (1.875 × 10⁷) cubic metres

There are over 400 beaches in the world, Using an estimate of 400 beaches

The number of grains of sand on Earth's beaches = 10⁹ × 400 × 1.875 × 10⁷

There are approximately (7.5 × 10¹⁸) grains of sand on all of the world's beaches

Then, Avogadro's number found that 1 mole of all particles contain

(6.022 × 10²³) particles.

So, the number of particles in a mole is about [(6.022 × 10²³)/(7.5 × 10¹⁸)]

the number of grains of sand on Earth’s beaches.

So, the division gives, (8.0 × 10⁴).

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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:

1.80 g (grams) of glucose.

Explanation:

First, we dissolve 20.0 g of glucose in a volume of water of 100 mL (0.1 L), so let's calculate the concentration of glucose in g/L, like this:

Now, we take 45 mL (0.045 L) of this solution that contains a concentration of glucose of 200 g/L to create a new solution with 0.500 L.

From this new solution, we have to find the mass of glucose if we took 100 mL (0.1 L) of this solution, so we have to use the following equation:

Where C is concentration, V is volume, and subindex 1 and 2 indicate the initial solution, which in this case, is C1 = 200 g/L, V1 = 0.045 L, and the final solution with unknown concentration (C2) and a volume of V2 = 0.500 L.

Let's solve for C2 and replace the given data to obtain the new concentration (final concentration) of the new solution of 0.500 L, like this:

The final concentration of glucose in 0.500 L would be 18.0 g/L.

The next and final step is to calculate the total mass using the volume that we took from the 0.500 L solution, which is 100.0 mL (0.1 L). To do this, we have to do a dimensional analysis to obtain the answer in units of grams, so the calculation will look like this:

The answer would be that we have 1.80 g (grams) of glucose in 100 mL from the 0.500 L solution.

Answer:

If the temperature of a gas remains constant the the pressure of gas will increase the impacts on the walls of the container , thus increasing the volume

If air conditioning system won't be able to chill your home until the fan is fixed if it has stopped functioning.

Your air conditioning system won't be able to chill your home until the fan is fixed if it has stopped functioning. The circuit breaker should be checked first if the AC unit fan is not whirling. Check to see if the circuit breaker for the air conditioning equipment has tripped. The heat from the motor and the weather outdoors can cause a circuit breaker to trip due to overheating.

If the fan won't turn on, the fan motor might be malfunctioning. If you are having trouble getting the blades to turn, the motor bearings may be dusty or stuck, or there may be debris wrapped around the fan axle.

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If the fan motor is malfunctioning, it could seriously harm your system. Your entire system could fail if the fan motor becomes stuck, which could lead to the compressor overheating and failing.

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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.

The hybrid orbital of this molecule is B. sp³d

Trigonal symmetry was used to generate a combination of s and p orbitals, which are kept at 1200. Ethylene (C2H4) sp3 hybridization is an example of sp2 hybridization. To create a novel hybrid orbital known as the sp3 sp3 orbital, one's' orbital and three 'p' orbitals of equal energy are mixed in this type: One of four new comparable orbitals that result from geometrically combining one s orbital and three p orbitals to create a normal tetrahedron's four corners.

Again, we refer to them as sp3 particles because they are made up of a single s orbital and three p orbitals. These degenerate hybrid orbitals are created to offset the s-p transition's energy upward.

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The wind tends to blow from over the water to over the land due to the differences in the density of air. Air over the water is cooler than air over the land and denser air from over the water flows toward the land. Therefore, options A, C, and D are correct.

The sea breeze is the wind that blows across the sea toward land throughout a sunny day. The air over land heats up more quickly during the day and starts to rise in coastal areas.

A low-pressure area forms on the surface of the land as the warm air rises, allowing air over the water to enter. As a result, during the day the wind direction is from the water to the land and this wind happens to be the sea breeze.

The sea breeze is a thermally produced wind during the day blowing from the cool ocean towards warm land. It is caused by the difference in the density of air between the land and the ocean.

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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

The formula weight of zinc phosphate is 385g/mol.

The formula weight or molar mass of zinc phosphate is calculated by adding weight of every single element present in zinc phosphate.

Formula of zinc phosphate is Zn₃(PO₄)₂.

Weight of 3 zinc atoms = 3×65= 195g/mol

Weight of 2 phosphorus atoms =2×31=62g/mol

Weight of 8 oxygen atoms = 8×16= 128g/mol

So, the total molecular weight of the compound is 195+62+128= 385g/mol.

Thus, the molecular weight of zinc phosphate is 385g/mol.

Zinc phosphate is an inorganic chemical substance that is used as a priming pigment or as part of the electroplating process to provide a corrosion-resistant coating on metal surfaces. It is common practice to employ a seeding chemical as a pre-treatment because zinc phosphate adheres to crystalline structures better than bare metal. Dental practices use zinc phosphate, which is created from zinc phosphate cement.

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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 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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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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1. The concentration of the vitamin C in ppm is 800 ppm

2. The concentration of the vitamin C in ppb is 800000 ppb

1. How to determin the concentration in ppm

The concentration of the vitamin C in ppm can be obtained as follow:

Concentration (in ppm) = (mass of solute / mass of solution) × 10⁶

Concentration (in ppm) = (0.12 / 150) × 10⁶

Concentration (in ppm) = 800 ppm

2. How to determin the concentration in ppb

The concentration of the vitamin C in ppb can be obtained as follow:

Concentration (in ppb) = (mass of solute / mass of solution) × 10⁹

Concentration (in ppb) = (0.12 / 150) × 10⁹

Concentration (in ppb) = 800000 ppb

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Answer:

Which one ? can u put a question here?

We have an initial concentration of a stock solution that has molarity equal to 1M. In a previous question, the stock solution was diluted 10 times, this solution was called solution A. The concentration of solution A found was equal to 0.1M.

Now, we are asked to find the concentration of solution B that starts from solution A.

The initial concentration C1 is the concentration of solution A, equal to 0.1M. The initial volume (V1) is 10mL, and the final volume (V2) is 100mL. We will apply the dilution equation that says:

We clear C2 and replace the known data:

Answer: The molarity of solution B is 0.01 M

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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Step 1 - Understanding what happens when a reaction reaches equilibrium

When a reaction reaches equilibrium, the concentration of reactants and products will not vary anymore. That doesn't mean the concentration of reactants will be equal to that of products. It won't. At least, not necessarily. It may be, but it may not as well.

What actually happens when equilibrium is reached is that both reactions - the direct and the reverse one - are happening with the same velocity, i.e., their rate of reaction is the same, and that's why neither the concentration of reactants nor products vary.

As soon as a new molecule of product is produced, another molecule of product is reacting back to produce the reactants once again.

Step 2 - Choosing the right alternative

The right alternative therefore is the rate for the forward and reverse reactions are the same.

Answer: the rate for the forward and reverse reactions are the same

Step 1

The equations used here:

------------

Step 2

Information provided:

[H3O+] = 3.5×10^−7 M

------------

Step 3

Procedure:

Firstly, from (1):

pH = -log [H3O+]

pH = -log (3.5×10^−7 M) = 6.5

----

From (3):

pH + pOH = 14

pOH = 14 - pH

pOH = 14 - 6.5

pOH = 7.5

----

From (2)

pOH = - log [OH-] => [OH-] = 10^-(pOH)

[OH-] = 10^-(pOH) = 10^-(7.5) = 3.2x10^-8 M

Answer: [OH-] = 3.2x10^-8 M

In order to reliably compute the number of moles present from the measured weight and the known molar mass, is a chemical that can be exactly weighed out in pure forms, such as oxalic acid.

A standard solution is a liquid with a precisely known concentration that is made from a primary standard, which is a substance that is stable, highly pure, highly soluble in water, and has a high molar mass to enable precise weighing. The primary standard is weighed precisely and is made up to a specific volume.

The terms primary solution and secondary solution refer to two different categories of standard solutions. A primary standard solution is a highly pure, low-reactive solution. A secondary standard is less pure than a prime standard and more chemically reactive.

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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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Answer

a. True

Explanation

If there was nothing to avoid from objects pulling towards one another many results may happen.

Answer:

let me know if this was helpful please.

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.

Explanation:

According to the problem, hydrochloric acid will react with oxygen gas to produce water and chlorine gas.

hydrochloric acid + oxygen gas ----> water + chlorine gas

The balanced equation will be:

4 HCl + O₂ -----> 2 H₂O + 2 Cl₂

If we pay attention to the coefficients of the reaction we will see that 4 moles of HCl will react with 1 mol of O₂ to produce 2 moles of H₂O and 2 moles of Cl₂. So, 1 mol of O₂ will produce 2 moles of H₂O. The molar ratio between O₂ and H₂O is 1 to 2.

1 mol of O₂ : 2 moles of H₂O molar ratio

We can use this relationship to find the number of moles of H₂O that are produced from 5.52 moles of O₂.

moles of H₂O = 5.52 moles of O₂ * 2 moles of H₂O/(1 mol of O₂)

moles of H₂O = 11.0 moles

Answer: 11.0 moles of water are produced from 5.52 moles of oxygen gas.

Answer

2319.698 g

Procedure

Use the Avogadro's number and then the molecular weight to convert into grams. The formula for aluminum bromide is AlBr₃.