Joebert had a rectangular cup and filled it with water. He measured the water's mass and volume. Then he got a density of 1.25g/ml. If the accepted density of water is 1 g/ml, what was the percent error of his measurement?

someone can help me please?

Answer:

An atom is a particle of matter that uniquely defines achemical element. An atom consists of a central nucleus that is usually surrounded by one or more electrons. Each electron is negatively charged. The nucleus is positively charged, and contains one or more relatively heavy particles known as protons and neutrons.

There are different ways to describe an atom because it is a complex entity that can be characterized from different perspectives, depending on the context and purpose of the description.

Atomic models are developed to describe the structure and electronic properties of an atom. In general, there are two main ways to describe an atom: the classical model and the quantum mechanical model.

The classical model of the atom is also known as the Bohr model, which depicts the atom as a small, positively charged nucleus surrounded by electrons that move in circular orbits at fixed distances from the nucleus.

This model is useful for explaining some of the basic properties of atoms, such as their electron configuration and the emission and absorption of light. However, it is limited in its ability to account for the behavior of atoms in more complex situations, such as chemical reactions.

The quantum mechanical model of the atom is based on the principles of quantum mechanics and describes the behavior of electrons as waves rather than particles moving in fixed orbits.

This model is more accurate and comprehensive than the classical model and can account for a wider range of atomic properties, including electron spin and the distribution of electron density in the atom

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Answer:

-trees

-solar energy

-hydroelectricity

-wind energy

sorry I can only think or 4 atm

Molecules with polar bonds or specific functional groups with asymmetric vibrations are most strongly affected by infrared photons. Molecules with nonpolar bonds or symmetric functional groups that lack infrared-active vibrations are least affected.

When a photon interacts with a molecule, the degree to which the molecule is affected depends on whether the photon's energy matches the energy required to excite the molecule's vibrational modes. Infrared (IR) photons have energies that correspond to molecular vibrations, and therefore, molecules with certain characteristics are most strongly affected by them. Molecules with polar bonds or functional groups containing asymmetric stretching or bending vibrations are most strongly affected by infrared photons. Examples include water (H2O), carbon dioxide (CO2), ammonia (NH3), and various organic compounds with functional groups like carbonyl (C=O) and hydroxyl (OH). Molecules with nonpolar bonds or symmetric functional groups that lack vibrational modes in the infrared region are least affected by infrared photons. These include diatomic molecules like oxygen (O2), nitrogen (N2), and noble gases such as helium (He). Hence Molecules with polar bonds or specific functional groups with asymmetric vibrations are most strongly affected by infrared photons. Molecules with nonpolar bonds or symmetric functional groups that lack infrared-active vibrations are least affected.

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Active transport requires energy to transport the molecules across the cell membrane. Thus, Option A is correct.

Active transport is the transport of molecules from a lower concentration to a higher concentration across the cell (plasma) membrane. As this process is against the concentration gradient, it requires cellular energy to transport the molecules or ions. Active transport involves Primary active transport and secondary active transport.

Passive transport involves the movement of molecules from a higher to lower concentration gradient and thus does not require energy and is slower than active transport.

Therefore, only active transport requires energy for the transportation of molecules across the cell membrane.

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Answer:c

Explanation:c

The volume of 0.555M KNO3 solution would contain 12.5 g of solute iss 223 mL.

The mass of solute in a given volume of solution is related by the formula below:

Therefore, volume of solution is given by:

Volume = Mass /molarity * molar mass

Molar mass of KNO₃ = 101 g/mol

Volume = 12.5/(0.555 * 101)

Volume = 0.223 L or 223 mL

In conclusion, the volume of the solution is obtained from the molarity of solution as well as mass and molar mass of solute.

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The universe contains practically incalculable numbers of planets, moons, asteroids, comets, and clouds of dust and gas, all of which are whirling around in the expanse of space together with billions of galaxies and trillions of stars.

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Methyl orange is a suitable indicator and gives the color change that would be seen.

As part of the titration, methyl orange, a common pH indicator, is used. As an acid indicator, methyl orange causes the color of the solution to turn red. Yellow results from the combination of methyl orange and a base, or the color turns yellow when combined. Methyl orange is used as a symbol for pH.

Alkaline and neutral water can both be turned yellow by methyl orange. When water becomes acidic, it immediately turns red. At pH 4.3, a change has occurred. For the titration, hydrochloric acid at a concentration of 0.1 mol/L is used if the solution is yellow.

Acid produces a yellow color from it, then it was countered with more base. So that the end point of the reaction displays a light pink color.

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The complete question is:

"A student used a pipette to add 25.0 cm3 of sodium hydroxide of unknown concentration to a conical flask.

The student carried out a titration to find out the volume of 0.100 mol / dm3 sulfuric acid needed to neutralize the sodium hydroxide.

Describe how the student would complete the titration.

You should name a suitable indicator and give the color change that would be seen."

Answer:

\(49.45~%\)

Explanation:

In this case, we have to start with the chemical reaction:

\(C_6H_1_2O~->~C_6H_1_0~+~H_2O\)

So, if we start with 10 mol of cyclohexanol (\(C_6H_1_2O\)) we will obtain 10 mol of cyclohexanol (\(C_6H_1_0\)). So, we can calculate the grams of cyclohexanol if we calculate the molar mass:

\((6*12)+(10*1)=82~g/mol\)

With this value we can calculate the grams:

\(10~mol~C_6H_1_0\frac{82~g~C_6H_1_0}{1~mol~C_6H_1_0}=820~g~C_6H_1_0\)

Now, we have as a product 500 mL of \(C_6H_1_0\). If we use the density value (0.811 g/mL). We can calculate the grams of product:

\(500~mL\frac{0.811~g}{1~mL}=405.5~g\)

Finally, with these values we can calculate the yield:

\(%~=~\frac{405.5}{820}x100~=~49.45%\)%= (405.5/820)*100 = 49.45 %

See figure 1

I hope it helps!

Based on the data given, the percentage yield of the student's work is 49.45 %.

The equation of the clay-catalyzed dehydration of cyclohexanol is given below:

From the equation of the reaction, 1 mole of cyclohexanol yields 1 mole of cyclohexene.

Therefore 10 moles of cyclohexanol should yield 10 moles of cyclohexene.

First we determine the mass of cyclohexene obtained.

Mass = density * volume

volume of cyclohexene = 500 mL

density = 0.811 g/mL

mass of cyclohexene = 500 * 0.811

mass of cyclohexene = 405.5 g

Number of moles of cyclohexene = mass/molar mass

molar mass of cyclohexene = 82 g

moles of cyclohexene = 405.5 g/82

moles of cyclohexene = 4.945 moles

Percentage yield = 4.945/10 * 100%

Percentage yield = 49.45%

Therefore, the percentage yield of the student's work is 49.45 %.

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The two functional groups that the aminoacid has according to the picture are amine and carboxyl.

In chemistry and related areas, a functional group can be defined as a group of atoms bonded in a specific molecule that can affect the was the molecule reacts or the specific behavior of it.

In the case of the molecule presented, which is an amino acid, two functional groups can be identified:

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Answer:

neutral/no charge

Explanation:

Henri Matisse talked about new ideas in creative expression that he thought were emerging at the moment as well as his vision for modern art.

The use of color and shape to convey emotion, according to Matisse, should take the place of the conventional representational approach that sought to mimic the real world. He held that artists should be allowed the freedom to interpret the world in light of their personal experiences and that contemporary art was really about individual expression.

Matisse believed that contemporary artists should aim for simplicity and clarity in their work, distilling the natural world down to its most basic components. To achieve a sense of coherence in entire composition, he emphasised on significance of balance and harmony in the use of color and shape. Overall, "Notes of a Painter" contributed to the development of the modernist movement in art, which emphasised the value of creativity and individual expression

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The mass of water created by burning 1.69 g of such a substance having the equation CH4O is 1.18 g.

The total atomic masses of every atom in a molecule make up its molecular mass.

We are aware that the atomic masses of carbon (12 u) and oxygen (16 u) are different.

Thus, the molar mass of atmospheric co2 (CO2) is equal to the sum of the atomic masses of carbon and oxygen (12 + 32) to get 44 u.

We may determine the atomic weights of the elements using their periodic tables, and we discover that hydrogen does have an atomic masses of 1, while that of oxygen is 16. One water molecule's molecular weight may be calculated by using we add the contributions from each atom; that is, 2(1) + 1(16) = 18 grams/mole.

The following is the atoms of each element equation for the combustion of CH4O:

Carbon dioxide's (CO2) molecular mass is calculated as follows: (12 + 32) = 44 u; (atomic weight of C) + 2 atomic mass of O.

2CH4O + 3O2 ----> 2 CO2 +   4 H2O

Now, molar mass of CH4O = (12 + 1*4 + 16) g/mol = 32 g/mol

Hence, 1.05 g of CH4O = 1.05g/32 g/mol = 0.0328 mol

According to balanced equation, 2 mol CH4O on combustion gives 2 mol of CO2 (2 mol * 44 g/mol = 88 g CO2) [Molar mass of CO2 = 44g/mol]

Hence, from 0.0328 mol CH4O, CO2 generated = 88 g * 0.0328 mol/2 mol = 1.44 g

Once more, based on the balanced equation,

2 mol CH4O on combustion gives 4 mol of H2O (4 mol * 18 g/mol = 72 g H2O) [Molar mass of water = 18 g/mol]

Hence, 0.0328 mol CH4O on combustion gives 72g * 0.0328 mol/2 mol = 1.18 g of H2O

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Answer:

The answer is C) Gravity keeps all matter on Earth.

Explanation:

I took the test and this was correct!

(Not a fake answer like some, I promise!)

The Van't Hoff factor of the solution is  3.56.

We know that the formula for freezing point depression is;

ΔT = K m i

ΔT = freezing point depression

K = Freezing constant

m = molality of solution

i = Van't Hoff factor

ΔT = Freezing point of pure water - Freezing point of solution

Freezing point of pure water = 0°C

ΔT = 0°C - ( –0.412°C)

ΔT = 0.412°C

Now;

i = ΔT/K m

K = 1.86 °C/m for water

m =  0.0622 m

i =  0.412°C/ 1.86 °C/m ×  0.0622 m

i = 3.56

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Seismic waves can move through both empty space and matter. Electromagnetic waves differ from sound waves in this regard because they do not require molecules to move.

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The options that affect the amount that the freezing point is lowered by the addition of the solute include :

The increasing of a solvent's boiling point as a result of the addition of a solute is known as boiling point elevation. Similar to freezing point depression, adding a solute lowers the freezing point of a solvent. In actuality, a solvent's freezing point drops as its boiling point rises.

Any solvent's freezing point will be lowered by the presence of a solute; this action is known as freezing-point depression. The fact that the solute is present in the liquid solution but not in the pure solid solvent is crucial to understanding this phenomenon.

This includes the compound being ionic or the solubility of the solvent.

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The first half-reaction is the oxidation of Cr2O7^2– to Cr^3+ and the second half-reaction is the reduction of I^– to IO3^–. When combined, the overall reaction is Cr2O7^2– + I^– → Cr^3+ + IO3^–.

The electrolytic cell consists of two electrodes, one anode and one cathode, both of which are immersed in an electrolyte solution. At the anode, the Cr2O7^2– ions are oxidized to Cr^3+ ions, releasing electrons into the external circuit.

At the cathode, the I^– ions are reduced to IO3^– ions, and the electrons from the external circuit are used to drive the reaction. The electrolyte solution must contain both Cr2O7^2– and I^– ions in order to facilitate the transfer of electrons between the electrodes.

The overall reaction is driven by the potential difference between the anode and the cathode, which is created by the flow of electrons through the external circuit.

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Answer:

Ca.

Sb.

Explanation:

a. When comparing the two elements Ca and As , the more metallic element is:__________ based on periodic trends alone.

The correct option is Ca. Ca belongs to group 2 which is more easily give off it's electrons, compared to As which is a group 5 member.

c. When comparing the two elements Sb and Pb , the more metallic element is:___________ based on periodic trends alone.

The correct option here is Pb. Thhs is because ionization energy decreases down the group. Pb has a lower ionization enthalpy than Sb

Answer:

a) Ca

b) Ca

c) Pb

d) Pb

Explanation:

We must have it behind our minds that metallic properties decreases as we tend towards the right and side of the periodic table. This implies that we find more metallic species at the left hand did of the periodic table and as we tend towards the right hand side, elements become less metallic as indicated by periodic trends.

Calcium is a group 2 metal with full metallic properties while arsenic is a metalloid. Similarly, lead is a group 14 metal with full metal properties while antimony is a metalloid. Hence the answers given above.

2. The pH is 4.22 × 10⁸. 3. pH is 7, 4. pOH is 9.7, 5. diprotic is explained below, 6. Amphoteric is explained below, 7. pH meter, 8. A buffer solution is explained below, 9. Titration is explained below, 10. Difference between strong and weak acids is explained below.

2. pH = -log[H⁺]

pH = -log(4.22 x 10⁻⁸)

pH ≈ 7.375

3. pH + pOH = 14

pH + 7 = 14

pH = 14 - 7

pH = 7

4. pH + pOH = 14

pOH = 14 - pH

pOH = 14 - 4.3

pOH ≈ 9.7

Now,

[H⁺] × [OH⁻] = 1.0 x 10⁻¹⁴

[OH⁻] = 1.0 x 10⁻¹⁴ / [H⁺]

[OH⁻] = 1.0 x 10¹⁴ / 10^(-pOH)

[OH⁻] = 1.0 x 10⁻¹⁴ / 10^(-9.7)

[OH⁻] ≈ 1.99 x 10⁻⁶ M

5. Being diprotic means that a molecule or ion can donate or release two protons (H⁺ ions) in an acid-base reaction.

6. Amphoteric refers to a substance that can act as both an acid and a base.

7. The pH can be measured using a pH meter or a pH indicator.

8. A buffer solution is a solution that can resist changes in pH when small amounts of acid or base are added to it.

9. Titration is a laboratory technique used to determine the concentration of a solution by reacting it with a solution of known concentration (titrant) of another substance.

10. A strong acid is an acid that completely ionizes in water, releasing all of its hydrogen ions. A weak acid is an acid that does not completely dissociate into ions when dissolved in water.

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Answer:

  C. The boiling point of water

Explanation:

We assume your question is the one attached.

Obviously, the shape of the (liquid) water is a function of the container it is in, as it is for any liquid or gas.

The rate of evaporation will depend on the temperature and on the surface area. The different containers are different in both ways, so evaporation is not a constant.

The boiling point is a physical property of the water, so will be the same across all containers.

The amount of steam released is related to the rate of evaporation. It will not be a constant across the different containers.

__

The appropriate choice is ...

  The boiling point of water

Answer:

0.83 moles

Explanation:

To find the number of moles of NO that are formed from 2.50 moles of NO2 in the presence of plenty of water, we can use the mole ratio from the balanced chemical equation. The mole ratio is the ratio of the number of moles of each reactant and product in the chemical reaction.

In the given reaction, the mole ratio of NO2 to NO is 3:1. This means that for every 3 moles of NO2, 1 mole of NO is formed. Therefore, if we have 2.50 moles of NO2, the number of moles of NO that are formed will be 1/3 of that amount, which is 2.50 moles / 3 = 0.83 moles.

Therefore, the number of moles of NO that are formed from 2.50 moles of NO2 in the presence of plenty of water is 0.83 moles.

The methyl orange indicator will change from red to yellow at the titration's endpoint.

An acid-base indicator called methyl orange changes color between the pH ranges of 3.1 and 4.4. In acidic and basic solutions it is red and yellow, respectively

In this instance, an acid, hydrochloric acid, is being used to titrate the barium hydroxide solution. The pH of the solution will fall as we add the acid since it will neutralize the base. The hue of the methyl orange indicator will vary when the pH ranges from 3.1 to 4.4

All of the barium hydroxide will have interacted with the hydrochloric acid by the time the titration is complete leaving a neutral solution. When the methyl orange indicator becomes yellow the solution's pH is in the basic range.

Therefore, the methyl orange indicator will change from red to yellow at the titration's endpoint.

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The measure of the length of events and the duration of intervals between events is time.

The duration of events or the gaps between them can be measured, compared, or even ordered using time. The lengthy period of time that the Earth's geologic history takes up is known as geologic time. Starting at the beginning of the Archean Eon  formal geologic time runs until the present. Geology is defined as the "Science of the Earth."

Geology is the fundamental Earth science that examines how the earth created, its structure and composition, and the various forces acting on it. It is sometimes known as geoscience or earth science.

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Okay, here are the key points to consider:

- Crude oil is separated into various components like gasoline, diesel fuel, jet fuel, bitumen, etc.

- A barrel of oil contains 22% gasoline and 38% diesel fuel. So these components make up a major portion of the oil.

- When the price of a barrel of oil increases, the costs to produce these components like gasoline and diesel also go up.

- So the prices of gasoline, diesel fuel and other components are directly linked to the price of crude oil. They will likely increase proportionally if oil price rises.

- Bitumen may be affected in supply but its price could still adjust based on supply and demand. It's linked to oil price indirectly.

- Diesel fuel price will also likely rise with oil price increase. It cannot be produced just from ethanol. It requires crude oil.

- Jet fuel price will also follow the increase in oil price. It's not inverse.

So among the options, the choice that is most accurate is:

The price of gasoline will increase in direct proportion to the increase in a barrel of oil.

The other options are not fully supported. Diesel and jet fuel prices will rise, bitumen may see some supply impact but prices will adjust, and prices are directly linked to oil prices, not inversely.

Let me know if you need more explanation.

Explanation:

Population density is defined as the number of people present per square kilometre. Population density of India according to 2011 census is 382 persons per square kilometres.