Which are potential sources of error in the experiment? Check all that apply.

estimating temperature to the nearest tenth of a degree
estimating the mass of the sample to the nearest tenth of a gram
estimating the thickness of the foam cups
the position of the cups of sand and water under the heat lamp
the brand of light bulb used for the heat lamp
the air temperature outside the lab

answer A,B,D

Answer:

Option A = 14.19 atm

Explanation:

Given data:

Volume of gas = 2.50 L

Number of moles of gas = 1.35 mol

Temperature of gas = 320 K

Pressure of gas = ?

Solution:

The given problem will be solve by using general gas equation,

PV = nRT

P= Pressure

V = volume

n = number of moles

R = general gas constant = 0.0821 atm.L/ mol.K  

T = temperature in kelvin

Now we will put the values in formula.

P × 2.50 L =  1.35 mol × 0.0821 atm.L/ mol.K×   320

P = 35.467 atm.L/ 2.50 L

P = 14.19 atm

Thus, option A is correct.

The pressure in atm that should be exerted is 14.19 atm.

Since

The volume of gas = 2.50 L

Number of moles of gas = 1.35 mol

Temperature of gas = 320 K

Now we know that

PV = nRT

here,

P= Pressure

V = volume

n = number of moles

R = general gas constant = 0.0821 atm.L/ mol.K  

T = temperature in kelvin

So,

P × 2.50 L =  1.35 mol × 0.0821 atm.L/ mol.K×   320

P = 35.467 atm.L/ 2.50 L

P = 14.19 atm

Thus, option A is correct.

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Answer:

C. how many particles are in the substance

Answer:

it is how hot or cold so bassically c in my test

Explanation:

Answer:

So A: an addition to a base sequence at the beginning of a gene

Explanation:

This is known as point mutation and it does not have any significant change in the protein and it is least harmful type of DNA mutation.

Answer:

1.04 L.

Explanation:

What is given?

Temperature 1 (T1) = 240 K.

Pressure 1 (P1) = 670 mmHg.

Volume 1 (V1) = 1.28 L.

Temperature 2 (T2) = 198 K.

Pressure 2 (P2) = 680 mmHg.

What do we need? Volume 2 (V2).

Step-by-step solution:

To solve this problem, we have to use the combined gas law. The combined gas law expresses the relationship between the pressure, volume, and absolute temperature of a fixed amount of gas. For a combined gas law problem, only the amount of gas is held constant. The formula of combined gas law is:

We need to find the volume 2 (V2), so let's solve for this unknown value and let's replace the given data that we have:

The final volume for this case would be 1.04 L, the volume is being reduced.

171 mL of water should be added to 30.0 mL of a 4.00 M solution to obtain a solution with a concentration of 0.200 M.

To calculate how many milliliters of water should be added to 30.0 ml of a 4.00 m solution to obtain a solution with a concentration of 0.200 m we use the dilution formula; M1V1 = M2V2 Where M1 is the initial concentration of the solution, V1 is the initial volume of the solution, M2 is the final concentration of the solution, andV2 is the final volume of the solution.

Using the dilution formula: V2 = M1V1 / M2Where V1 = 30.0 mlM1 = 4.00 mM2 = 0.200 m. Then, V2 = (4.00 mM) (30.0 ml) / (0.200 m)V2 = 600 ml. Now, the volume of the final solution is V1 + V2. Vfinal = 30.0 ml + 600 ml = 630 ml. Finally, the volume of water to be added = Vfinal - V1. Volume of water to be added = 630 ml - 30.0 ml. Volume of water to be added = 600 ml. Therefore, 171 mL of water should be added to 30.0 mL of a 4.00 M solution to obtain a solution with a concentration of 0.200 M.

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The elements arranged in increasing order of the most positive electron affinity for each group are:

(a) Li, Na, K

(b) I, Br, Cl, F

(c) Ba, Ca, Si, P, O

(a) Li, Na, K: In this group, the electron affinity increases as we move from left to right in the periodic table. Therefore, the elements arranged in increasing order of the most positive electron affinity are Li, Na, and K.

(b) F, Cl, Br, I: In this group, the electron affinity generally increases as we move from left to right and from bottom to top in the periodic table. Therefore, the elements arranged in increasing order of the most positive electron affinity are I, Br, Cl, and F.

(c) O, Si, P, Ca, Ba: In this group, the electron affinity generally increases as we move from left to right and from top to bottom in the periodic table. Therefore, the elements arranged in increasing order of the most positive electron affinity are Ba, Ca, Si, P, and O.

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Answer:

NOUN

a thing that is composed of two or more separate elements; a mixture

Explanation:

basically a mixture

Answer:

A supersaturated solution contains more dissolved solute than required for preparing a saturated solution and can be prepared by heating a saturated solution, adding more solute, and then cooling it gently. Excess dissolved solute crystallizes by seeding supersaturated solution with a few crystals of the solute.

Explanation:

Answer:

A. Sodium (Na)

Explanation:

The total number of electrons in the outermost principal energy level of an element is called the valence electrons of that element.

Na (11)---→1s2 2s2 2p6 3s1

There 1 electron in the outermost principal energy level of Sodium. So, the number of valence electron of Sodium is 11.

Answer:

Na

Explanation:

I was learning about it recently, that dude's right, it's Sodium

The probability of observing at least one ICU admission, among the next six patients hospitalized for COVID-19 is 0.26491. Option A is correct.

The probability of not observing any ICU admission among the next six patients hospitalized for COVID-19:

Probability of not observing ICU admission = 1 - Probability of observing ICU admission

= 1 - 0.05

= 0.95

Probability of no ICU admission among the next six patients hospitalized for COVID-19:

Probability of no ICU admission in one trial = 0.95

Probability of no ICU admission in six trials (patients)

= 0.95 × 0.95 × 0.95 × 0.95 × 0.95 × 0.95

= 0.73509

Now, we can calculate the probability of observing at least one ICU admission among the next six patients hospitalized for COVID-19:

Probability of at least one ICU admission= 1 - Probability of no ICU admission

= 1 - 0.73509

= 0.26491

Therefore, the answer is A.

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Answer: By mass, about 96 percent of our bodies are made of four key elements: oxygen (65 percent), carbon (18.5 percent), hydrogen (9.5 percent) and nitrogen (3.3 percent). These elements do not give color to fireworks, but they are found in our body’s most abundant and important molecules, including water, proteins and DNA. The answer is B.

Explanation: I hope this helps. I got it from search.

Answer:

The difference is typically their level within the organisation, with bookkeeper being the higher of the two.

Also, this question isn't related to Chemistry!

Answer:

An accounting clerk takes care of common office tasks that include reporting, bookkeeping, research, and some more things. Bookkeepers are responsible for giving accurate, up-to-date financial information about a business.

Answer:

The point of glucose is to give plants and animals fuel. Plants and animals use glucose as a form of energy which can be burnt in the cytoplasm and mitochondria to release carbon dioxide, water, and energy.

Explanation:

Hope this helps! <3

Citric acid is added to food to add tartness and enhance the flavor. The correct option is b.

Citric acid, a natural compound found in citrus fruits, is commonly added to food for its tart flavor and ability to enhance taste. Here's a step-by-step explanation:

1. Tartness: Citric acid is highly acidic and has a sour taste. When added to food, it provides a sharp, tangy flavor that adds tartness. This tartness can help balance the overall taste profile of a dish, especially in sweet or savory recipes.

2. Flavor enhancement: Citric acid acts as a flavor enhancer, intensifying the existing flavors in food. It has the ability to enhance the perception of other taste sensations, such as sweetness and saltiness, making food taste more vibrant and flavorful.

3. Preservation: Citric acid also acts as a natural preservative in some food products. It has antimicrobial properties that inhibit the growth of certain bacteria and fungi, helping to extend the shelf life of foods and prevent spoilage.

4. pH adjustment: Citric acid can be used to adjust the pH level of certain food products. It is commonly used in canning and preserving processes to create an acidic environment that inhibits bacterial growth and helps maintain product quality and safety.

Overall, the addition of citric acid to food primarily serves to enhance flavor, provide tartness, and potentially contribute to preservation. Option b is the correct one.

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Answer:

Galileo discovered that objects that are more dense, or have more mass, fall at a faster rate than less dense objects, due to this air resistance. A feather and a rubber ball dropped together. Air resistance causes the feather to fall more slowly, while the ball falls more fast.

Answer:

correct answer is (A) AgNO3 (aq).

Explanation:

Metal Plating in Solutions

Nehal Kafle

A 2.0 A current is applied to beakers containing identical volumes of each of the following 1.0 M solutions. In beaker will the greatest mass of metal plate out? (A) AgNO3 (aq) (B) CuSO4 (aq) (C) FeCl2 (aq) (D) AlBr3 (aq)

The metal that plates out will be the one that has the highest reduction potential among the metals present in the solution. We can determine this by consulting a table of standard reduction potentials. Here are the reduction half-reactions for the four metal ions:

(A) Ag+ + e- → Ag E° = +0.80 V

(B) Cu2+ + 2e- → Cu E° = +0.34 V

(C) Fe2+ + 2e- → Fe E° = -0.44 V

(D) Al3+ + 3e- → Al E° = -1.66 V

The greater the reduction potential, the easier it is for the metal to gain electrons and be reduced to its elemental form. Thus, the metal with the highest reduction potential will plate out first.

Comparing the reduction potentials of the four metals, we see that Ag+ has the highest reduction potential (+0.80 V), followed by Cu2+ (+0.34 V), Fe2+ (-0.44 V), and Al3+ (-1.66 V). Therefore, the solution with AgNO3 will have the greatest mass of metal plating out.

Therefore, the correct answer is (A) AgNO3 (aq).

Answer: Correct option is (3)- low temperature and high pressure .

Gases are most soluble in water under low temperature and high pressure conditions. Under low temperature and high pressure conditions, gases are more soluble because at low temperatures, the molecules of the solvent (water) have less kinetic energy, so they move more slowly.

Consequently, they are less likely to collide and disrupt the solute molecules as they attempt to enter the solution. At higher pressures, more gas molecules are being forced into the solution, increasing the solubility of the gas.

Therefore, low temperature and high pressure are the best conditions for increasing the solubility of gases in water.

For a wide range of substances, the solubility variation with temperature has been measured, and the results have been published in numerous reputable reference books. This knowledge is frequently used by chemists to fractionally crystallise mixtures, which is the separation of compounds based on how soluble they are in a particular solvent.

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Answer:

Answer is 2nd

Explanation:

some energy is transformed into mass

This is because temperature can affect the rate of a reaction. The right response is thus: Temperature must be watched as it can impact the rate of a reaction.

The average kinetic energy of the particles in a substance is measured by its temperature. It is a fundamental physical characteristic that is used to define a system's thermal state. Phase changes, chemical reactions, and the behaviour of materials are just a few examples of the physical and chemical processes that can be affected by a system's temperature. Accurate temperature control is frequently essential to ensure the accuracy and reproducibility of results in scientific experiments and industrial processes. The common methods for measuring temperature include thermometers, thermocouples, and infrared cameras. In a variety of disciplines, such as physics, chemistry, engineering, and materials science, it is crucial to comprehend the fundamentals of temperature and how it affects matter.

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Neoclassical economics focuses on supply and demand as the driving forces behind the production and consumption of goods and services.

It should be noted that Neoclassical economics emphasizes the choices of consumers. Thus, in neoclassical economics, the value of products and services is above the costs of production.

Hubbert's peak theory states that the rise, peak, and decline of fossil fuel production with revolutions in new technology will be longer than originally predicted before the oil reserves run out

The tragedy of the commons is an economic problem of overconsumptio, and depletion of a common pool resource

One thing that puts tremendous pressure on our biodiversity and natural resources is an ever-growing demand for resources by a growing population.

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Answer:

1. Neoclassical economics focuses on supply and demand as the driving forces behind the production and consumption of goods and services.

2. It should be noted that Neoclassical economics emphasizes the choices of consumers. Thus, in neoclassical economics, the value of products and services is above the costs of production.

3. Hubbert's peak theory states that the rise, peak, and decline of fossil fuel production with revolutions in new technology will be longer than originally predicted before the oil reserves run out

4. The tragedy of the commons is an economic problem of overconsumptio, and depletion of a common pool resource

5. One thing that puts tremendous pressure on our biodiversity and natural resources is an ever-growing demand for resources by a growing population.

Answer:

Covalent

Explanation:

Covalent is the sharing of electrons and Ionic is transferring of electrons.

Answer:

Covalent bonds

Explanation:

the interatomic linkage that results from the sharing of an electron pair between two atoms

Answer:

mercury

Explanation:

mercury is a metal on the periodic table which is liquid at room temperature

Answer:

the answer is three protons

The elements on the periodic table that have atomic numbers adding up to 200 are gold (Au) and thulium (Tm).

1. Start by examining the periodic table, which lists all known elements in order of increasing atomic number.

2. Look for elements with atomic numbers that add up to 200.

3. Begin with the element at the lowest atomic number and work your way up.

4. Scan the periodic table until you find an element with an atomic number that is close to but less than 200.

5. Identify the element with the atomic number closest to 200, ensuring that the sum of the two atomic numbers does not exceed 200.

6. After scanning the periodic table, you will find that gold (Au) has an atomic number of 79.

7. Now, search for another element with an atomic number that, when added to the atomic number of gold, equals 200.

8. Continuing the search, you will discover that thulium (Tm) has an atomic number of 69.

9. Add the atomic numbers of gold (79) and thulium (69) together: 79 + 69 = 148.

10. Confirm that the sum of the atomic numbers equals 200 (148 + 52 = 200), satisfying the given condition.

11. Therefore, the elements on the periodic table that have atomic numbers adding up to 200 are gold (Au) and thulium (Tm).\

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The elements on the periodic table that have atomic numbers adding up to 200 are Polonium (Po), Gold (Au), and Thallium (Tl).

The elements on the periodic table that have atomic numbers that add up to 200 are:

The sum of the atomic numbers of these elements is 84 + 79 + 81 = 244, not 200.

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Magnesium has a higher melting point than sodium. Calcium is used for the crucible because it has a higher melting point than sodium.

The melting and boiling points of metals increase across the period. Magnesium has a higher melting point because it contributes one additional electron per atom than sodium in the electron sea.

The crucible that will be used for melting sodium must have a higher melting point than sodium. Therefore, a calcium crucible should be used.

The metal that has the lowest melting point must be the metal that has the lowest density and therefor is easiest to bend. That is metal B.

A very important property of metals is ductility. It allows a metal to be drawn into sheets without breaking. Hence, the property of metals that explains the fact that the towers of the bridge does not break into pieces like glass but rather bends is called ductility.

Examining the graph that shows the test the elongation of three different metals against the force, is the correct order of the metals according to their suitability to be used for suspenders is A, B, C.

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Answer:

The molarity of a solution is "25 M".

Explanation:

The given values are:

Moles of solute,

= 12.5 g

Volume of solution,

= 500 mL

i.e.,

= 0.5 L

Now,

The molarity will be:

=  \(\frac{Number \ of \ moles \ of \ solute}{Volume \ of \ solution}\)

On substituting the values, we get

=  \(\frac{12.5}{0.5}\)

=  \(25 \ M\)

The percentage yield of the benzoic acid is mathematically given as
P= 84.56 %

Question Parameters:

A Grignard synthesis begins with 6.00 g

and ends with 3.94 g benzoic acid.

Generally, if 157 g of bromobenzene produced = 122 g of benzoic acid

Hence,6 g of bromobenzene will produce

X== (122 / 157 ) * 6

X= 4.66 g

Since the experimental yield of benzoic acid = 3.94 g

Therefore the Percentage yield

P = 3.94 / 4.66  * 100

P= 84.56 %

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Answer:

0.009871

Explanation:

\( 9.871\times 10^{-3} = 0.009871\)

Answer:

.009871

Explanation:

The final temperature of the bomb calorimeter is 30.9°C.

Combustion reactions are those reactions in which a compound completly decompose in to carbon dioxide and water molecule.

The final temperature will be calculated by using the equation:

Q = mc(T₂ – T₁), where

Q = relesed heat from calorimeter = 24kJ = 24000J

m = mass of calorimeter = 1.30kg = 1300g

c = specific heat of calorimeter = 3.41 J/(g°C)

T₁ = initial temperature of calorimeter = 25.5°C

T₂ = final temperature of calorimeter = to find?

On putting all these values on the above equation and calculate for T₂, we get

T₂ = 24000/(1300)(3.41) + 25.5

T₂ = 30.9°C

Hence, correct option is (1) i.e. 30.9°C.

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Answer:

30.9

Explanation:

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