would the reported mass of products be greater than, less than, or equal to the true value if the precipitate was not completely dry when its mass was determined? explain.

Answer:

What do you need help on

Explanation:

Answer:

The scientific method attempts to minimize the influence of bias or prejudice in the experimenter. Even the best-intentioned scientists can't escape bias. ... That's the job of the scientific method. It provides an objective, standardized approach to conducting experiments and, in doing so, improves their results.

Answer:

to get used to them

Explanation:

you have to practice them so that they can get into your head

Answer:

Coductivity

Explanation:

Because heat conducts to them!

The reaction between magnesium and oxygen gas to produce magnesium oxide, light, and heat is a chemical reaction known as a combustion reaction.

In a combustion reaction, a substance reacts with oxygen to produce an oxide and release energy in the form of heat and often light. Magnesium, in the presence of oxygen, undergoes a combustion reaction to form magnesium oxide (MgO). The reaction can be represented by the following equation:

2Mg + O₂ → 2MgO

During the reaction, the magnesium atoms combine with oxygen molecules to form magnesium oxide, releasing energy in the form of light and heat. This type of reaction is exothermic, meaning it releases energy to the surroundings. The high reactivity of magnesium with oxygen makes it a common example of a combustion reaction.

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A buffer system is designed to maintain a specific pH level (option c).

Buffer systems are essential in biological and chemical processes as they prevent significant changes in pH by resisting alterations in acidity or alkalinity. They consist of a weak acid and its conjugate base (or a weak base and its conjugate acid). When an acid or base is added to the buffer system, the weak acid or base reacts with the added component, minimizing the change in pH.

The buffer system achieves this by absorbing or releasing hydrogen ions (H+) to maintain a relatively constant pH. This ability to regulate pH is crucial for various physiological functions, such as maintaining proper enzyme activity and cellular processes.

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According to the analytical paper available in e-learning, there are 4 fatty acids found in soybean oil in significant quantities. The correct option is B.

These fatty acids are:

1. Linoleic acid (Omega-6): Linoleic acid is a polyunsaturated fatty acid and is essential for human health as it cannot be synthesized by the body. It plays a vital role in maintaining cell membranes, supporting the immune system, and providing energy.

2. Oleic acid (Omega-9): Oleic acid is a monounsaturated fatty acid that is beneficial for cardiovascular health. It helps to reduce LDL (bad) cholesterol levels while maintaining or increasing HDL (good) cholesterol levels.

3. Palmitic acid: Palmitic acid is a saturated fatty acid that is a common component in various plant oils. While saturated fats are generally considered less healthy, palmitic acid can still be part of a balanced diet.

4. Stearic acid: Stearic acid is another saturated fatty acid that is commonly found in plant oils. It has a neutral effect on blood cholesterol levels and can be safely consumed in moderation.

In conclusion, soybean oil contains 4 fatty acids in significant quantities. These fatty acids contribute to the overall nutritional profile of soybean oil and have various health benefits when consumed as part of a balanced diet.

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Answer:

Yes. The volume would be 1/4 of the initial volume.

Explanation:

At constant temperature, the pressure of a gas is inversely proportional to the volume of the gas. Hence;

P1V1 = P2V2

where P1 is the initial pressure, V1 is the initial volume, P2 is the final pressure, and V2 is the final volume.

If the pressure of a gas is quadrupled;

P2 = 4P1, the equation becomes

P1V1 = 4P1 x V2

Making V2 the subject:

 V2 = P1V1/4P1

        V2 = V1/4

This means that the volume would change by being reduced to 1/4 of the initial volume.

Answer:

radio waves

Explanation:

which has the longest wavelength and lowest frequency and energy. Ultraviolet light (UV) is divided into three regions: UV A, wavelength = 400 - 320 nm UV B, wavelength = 320 - 280 nm

The work done by the gas is -0.0124 L·atm and the heat absorbed from the thermostat is also -0.0124 L·atm.

To find the work done by the gas and the heat absorbed from the thermostat, we can use the first law of thermodynamics, which states that the change in internal energy of a system is equal to the heat absorbed by the system minus the work done by the system.

First, let's calculate the change in volume. The gas is allowed to double in volume, so the final volume will be 2 times the initial volume. The initial volume is 0.0124 dm^3, so the final volume will be 2 * 0.0124 dm^3 = 0.0248 dm^3.

Next, we need to calculate the work done by the gas. The work done by a gas expanding or contracting against a constant external pressure can be calculated using the equation: work = -P * ΔV, where P is the constant external pressure and ΔV is the change in volume.

In this case, the external pressure is 1.0 atm and the change in volume is (0.0248 dm^3 - 0.0124 dm^3) = 0.0124 dm^3. So, the work done by the gas is: work = -1.0 atm * 0.0124 dm^3 = -0.0124 L·atm.

To find the heat absorbed from the thermostat, we can rearrange the first law of thermodynamics equation: heat = change in internal energy + work. Since the problem states that the gas is an ideal gas, we can assume that the internal energy change is only due to changes in temperature, which means the change in internal energy is zero.

Therefore, the heat absorbed from the thermostat is equal to the work done by the gas: heat = -0.0124 L·atm.


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Answer:

It would take 150 kg to lift the load

Explanation:

The balanced chemical equation between pottasium and chlorine is as follows: 2K + Cl₂ → 2KCl. It is a combination reaction.

A chemical reaction is a process, typically involving the breaking or making of interatomic bonds, in which one or more substances are changed into others.

According to this question, a chemical reaction occurs between potassium metal and chlorine gas to form pottasium chloride as follows:

2K + Cl₂ → 2KCl

The chemical reaction is a combination reaction because it involves the combination of two elements to form a compound.

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Explanation: The Ice Would Sink Toward the Bottom

Density of Ice at 0 Celsius is 0.92 grams per milliliter. Therefore the Ice has a greater density than ethanol, and the ice cube should sink toward the bottom

The ion that has 26 protons, 28 neutrons, and 24 electrons is Iron (Fe) (option c).

An element can be determined by the number of protons in the nucleus of its atom. The number of protons present in an atom is referred to as the atomic number of the element.

This means that the number of protons in an atom is unique to a specific element.

Iron (Fe) has 26 protons in the nucleus of its atom.

Therefore, an ion with 26 protons is an ion of the element iron (Fe).

Magnesium (Mg) has 12 protons, Chromium (Cr) has 24 protons, Xenon (Xe) has 54 protons and Nickel (Ni) has 28 protons.

Thus, an ion which has 26 protons, 28 neutrons, and 24 electrons  is Fe (option c)

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Answer:

BE

Explanation:

Answer:

The acid will be neutralized overtime

Explanation:

The presence of the pyrites leads to the leaching of large amounts of sulphuric acid, however the basic carbonates neutralizes the acid according to the reaction equation;

CaCO3 + H2SO4 ---> CaSO4 + CO2 + H2O.

This will prevent all the deleterious consequences associated with the leaching of the acid in the abandoned coal mine.

Nuclear pores are large protein complexes that regulate the transport of molecules between the nucleus and the cytoplasm.

These pores are critical for maintaining the structural and functional integrity of the nucleus. The size of the nuclear pore is critical to the regulation of molecular transport. These pores are selective and can restrict larger molecules from traversing the membrane due to their size.
The nuclear pore complex contains a central channel, which allows small molecules, such as ions and small proteins, to pass through freely. However, larger molecules, such as RNA molecules and large proteins, are too large to pass through the channel. Instead, these molecules require specific transport mechanisms to cross the nuclear envelope.
The nuclear pore complex is composed of many different proteins, including nucleoporins. These proteins form a complex meshwork that lines the pore and regulates the size and shape of the pore. This complex meshwork prevents larger molecules from passing through the pore, while allowing smaller molecules to pass through.
In summary, nuclear pores restrict larger molecules from traversing the membrane due to their size. The nuclear pore complex regulates the size and shape of the pore, which in turn controls molecular transport between the nucleus and the cytoplasm. Understanding the regulation of nuclear pores is critical for understanding many biological processes, including gene expression and DNA replication.

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The amount after the given time is 0.84 M

The percentage decomposed is 58%

A first-order reaction is a chemical reaction in which the rate of reaction is proportional to the concentration of one reactant raised to the first power. The rate law expression for a first-order reaction is:

Rate = k[A]

Where [A] is the concentration of the reactant and k is the rate constant, which is specific to the reaction and temperature. In a first-order reaction, the half-life of the reaction is independent of the initial concentration of the reactant and is a constant value for a particular reaction.

Given that;

ln[A]t = ln[A]o - kt

ln[A]t = ln 2 - (87 * 0.01)

[A]t = 0.84 M

Thus the fraction decomposed = 2 - 0.84/2 * 100/1

= 58%

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The heat of combustion per mol of the glucose is 2840 kJ.

A reaction that involves the burning of a compound in the presence of air or oxygen is called combustion. In the absence of oxygen combustion of a compound cannot take place.

It is given that the combustion of glucose produces carbon dioxide and water. The balanced chemical reaction for the given process is expressed as:

C6H12O6 (s) + 6O2 (g) ------> 6CO2 (g) + 6H2O (l)

The energy released from this reaction is -2840 kJ. The above equation clearly shows that 1 mol of glucose is used during the reaction and the energy produced is -2840 kJ.

Therefore, the heat of combustion per mol of the glucose is 2840 kJ.

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The respective electrons, valence electrons, and electron shells number of the structures in the above image are as follows:

A valence electron is any of the electrons in the outermost shell of an atom; capable of forming bonds with other atoms.

An electron is the subatomic particle having a negative charge and orbiting the nucleus; the flow of electrons in a conductor constitutes electricity.

The electron shell is the collective states of all electrons in an atom having the same principal quantum number (visualized as an orbit in which the electrons move).

Therefore, the respective electrons, valence electrons, and electron shells number of the structures in the above image are as follows:

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Answer:

Chemical reactions occur when chemical bonds between atoms are formed or broken. The substances that go into a chemical reaction are called the reactants, and the substances produced at the end of the reaction are known as the products.

Explanation:

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When two amino acids undergo condensation to form a dipeptide, the byproduct of the reaction is water.

Condensation occurs through the removal of a hydroxyl group (-OH) from the carboxyl group of one amino acid and a hydrogen atom (-H) from the amino group of the other amino acid. The resulting chemical reaction leads to the formation of a peptide bond between the two amino acids, joining them together.

The release of water during this condensation or dehydration synthesis reaction allows for the formation of a dipeptide, which serves as the building block for larger polypeptides and proteins.

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Carbon dioxide molecule is critical for Adenosine Triphosphate (ATP) production in humans.  

During aerobic cellular respiration, glucose reacts with oxygen, forming ATP that can be used by the cell. Carbon dioxide and water are created as byproducts. The overall equation for aerobic cellular respiration is: In cellular respiration, glucose and oxygen react to form ATP. Many processes are capable of producing ATP in the body, depending on the current metabolic conditions. ATP production can occur in the presence of oxygen from cellular respiration, beta-oxidation, ketosis, lipid, and protein catabolism, as well as under anaerobic conditions. ATP is also formed from the process of cellular respiration in the mitochondria of a cell. This can be through aerobic respiration, which requires oxygen, or anaerobic respiration, which does not.

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Citric Acid:

The FTIR spectrum of citric acid typically shows characteristic peaks at around 1750-1700 cm-1, indicating the presence of carbonyl groups (C=O) in the molecule. Peaks in the range of 3500-3000 cm-1 indicate the presence of hydroxyl (OH) groups. Other notable peaks may appear in the range of 1200-1000 cm-1, corresponding to the C-O stretching vibrations.

Ascorbic Acid:

The FTIR spectrum of ascorbic acid typically displays peaks associated with hydroxyl groups (OH) in the range of 3600-3200 cm-1. A prominent peak around 1740 cm-1 indicates the presence of a carbonyl group (C=O). Peaks in the range of 1250-1000 cm-1 may represent C-O stretching vibrations.

To identify the specific graphs representing citric acid and ascorbic acid in an FTIR spectrum, you would need to refer to their unique characteristic peaks and compare them with the peaks observed in the graph.

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The mechanism that accounts for the reaction of 4-bromotoluene with sodium amide to form a mixture of 3- and 4-aminotoluene is nucleophilic aromatic substitution by addition-elimination. The correct alternative id option 2.

In this mechanism, the sodium amide acts as a strong nucleophile and attacks the electrophilic carbon in the aromatic ring of 4-bromotoluene.

The resulting intermediate is a highly unstable negative charge on the carbon atom of the ring, which is stabilized by the electron-withdrawing effect of the bromine substituent. The negative charge is delocalized around the ring, making the intermediate highly reactive.

The intermediate then undergoes an elimination reaction, in which the bromine atom is displaced by the incoming nucleophile, the sodium amide.

This creates an unstable intermediate with a negative charge on the carbon atom and a positively charged nitrogen atom. This intermediate quickly rearranges to form the final product mixture of 3- and 4-aminotoluene.

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The coefficient for OH^(-)(aq) in the balanced equation is 7.

In a balanced chemical equation, the coefficients represent the relative amounts of each species involved in the reaction. To balance the given equation, H2O2(aq) + Cr2O7^2-(aq) → O2(g) + Cr3+(aq), in a basic aqueous solution, we need to account for the presence of hydroxide ions (OH^(-)(aq)).

To balance the equation in a basic solution, we follow these steps:

Step 1: Balance the atoms other than hydrogen and oxygen. In this case, we have one Cr atom on each side and two O atoms on the reactant side but three O atoms on the product side.

Cr2O7^2-(aq) + H2O2(aq) → O2(g) + 2Cr3+(aq)

Step 2: Balance the oxygen atoms by adding water (H2O) to the side that needs more oxygen. We add three H2O molecules to the left side to balance the oxygen atoms.

Cr2O7^2-(aq) + 3H2O2(aq) → O2(g) + 2Cr3+(aq)

Step 3: Balance the hydrogen atoms by adding H^+ ions to the opposite side. We add 8H^+ ions to the right side to balance the hydrogen atoms.

Cr2O7^2-(aq) + 3H2O2(aq) → O2(g) + 2Cr3+(aq) + 8H+(aq)

Step 4: Balance the charge by adding OH^(-)(aq) ions to the opposite side. We add 7OH^(-)(aq) ions to the left side to balance the charges.

Cr2O7^2-(aq) + 3H2O2(aq) + 7OH^-(aq) → O2(g) + 2Cr3+(aq) + 8H+(aq)

Therefore, the coefficient for OH^(-)(aq) in the balanced equation is 7.

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Green plants absorb sunlight with a frequency of approximately 4.67 x 10^14 Hz to power photosynthesis.

To calculate the frequency of sunlight with a wavelength of 642 nm that is strongly absorbed by chlorophyll for photosynthesis, we'll need to use the following formula:

Frequency (ν) = Speed of light (c) / Wavelength (λ)

First, we'll convert the given wavelength from nanometers to meters:

1 nm = 1 x 10^(-9) m
642 nm = 642 x 10^(-9) m = 6.42 x 10^(-7) m

Now, we'll plug the values into the formula:

Speed of light (c) = 3.00 x 10^8 m/s
Wavelength (λ) = 6.42 x 10^(-7) m

Frequency (ν) = (3.00 x 10^8 m/s) / (6.42 x 10^(-7) m)

Frequency (ν) ≈ 4.67 x 10^14 Hz

So, green plants absorb sunlight with a frequency of approximately 4.67 x 10^14 Hz to power photosynthesis.

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The statement "1/2 of an oxygen atom can combine with 2/3 of a hydrogen atom" is false because Atoms are the basic building blocks of matter and cannot be divided into smaller parts without breaking down the atom's structure.

An oxygen atom is composed of 8 protons, 8 neutrons, and 8 electrons, and it is not possible to divide an oxygen atom into halves. Similarly, a hydrogen atom consists of 1 proton, 1 electron, and 0 or 1 neutron, and it cannot be divided into thirds.

When atoms combine to form molecules, they do so in specific ratios determined by their chemical properties.

In the case of oxygen and hydrogen, the most common combination is two hydrogen atoms and one oxygen atom, which combine to form a water molecule (\(H_2O\)). This is because the outer electron shells of the oxygen atom and the hydrogen atoms can interact in a way that stabilizes the resulting molecule.

Therefore the given statement is false

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In a charcoal-water-unknown mixture, this must be boiled in opposition because the coal is insoluble, and with the heated mixture the coal can be removed.

It is used in the chemical sciences as a technique used to purify chemicals by heating materials to temperatures above the crystallization of each compound.

Therefore, when a component is heated, the impurities are dissolved and can be removed from the solution, generating the purification of the compound.

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