You run an experiment in which two substances chemically react in a closed system. you run the same experiment in an open system. how would the masses of the products in each experiment compare? explain.

The heat needed to change 9.8 grams of solid ammonia at -75 degrees C into a gas at room temperature 25 degrees C is 231 kJ.

What is solid ammonia?
With the formula NH₃, ammonia is a nitrogen and hydrogen inorganic chemical. Ammonia, the simplest pnictogen hydride and a stable binary hydride, is a colourless gas with a strong, pungent odour. It contributes considerably to the nutritional demands of terrestrial creatures by serving as a precursor to 45 percent of the world's food and fertilisers. Biologically, it is a common nitrogenous waste, especially among aquatic animals. About 70% of ammonia is used to create fertilisers, including urea and diammonium phosphate, in a variety of shapes and compositions. Additionally, pure ammonia is sprayed straight onto the ground. Ammonia is also a key ingredient in many commercial cleaning solutions and is a building component for the manufacture of numerous medicinal medicines.

The change in enthalpy, or heat, of a chemical reaction is equal to the change in internal energy of the system plus the work done on the system.
The enthalpy of a system is the sum of its internal energy and the product of its pressure and volume.
In order to change a solid into a gas, the enthalpy of the system must increase by the amount of heat needed to break the intermolecular attractions between the particles of the solid.

The heat of vaporization of ammonia is 23.6 kJ/mol.

Therefore, the heat needed to change 9.8 grams of solid ammonia at -75 degrees C into a gas at room temperature 25 degrees C is 9.8 * 23.6 = 231 kJ.

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The volume of 0.175 M [tex]Na_3PO_4[/tex] solution required to completely react with 126 mL, 0.150 M  [tex]CuCl_2[/tex] is 0.72 L 0r 720 mL.

From the balanced equation of the reaction, the mole ratio of  [tex]Na_3PO_4[/tex] and   [tex]CuCl_2[/tex] is 2:3.

Recall that: mole = molarity x volume

126 mL = 126/1000 = 0.126 L

Mole of 126 mL, 0.150 M   [tex]CuCl_2[/tex] = 0.150 x 0.126

                = 0.0189 moles

Equivalent mole of  [tex]Na_3PO_4[/tex] from the mole ratio = 2/3 x 0.0189

                   = 0.0126 moles

Volume = mole/molarity

Volume of 0.0126 moles, 0.175 M  [tex]Na_3PO_4[/tex] = 0.126/0.175

               = 0.72 L

0.72 L = 0.72 x 1000

             = 720 mL

In other words, 0.72 L 0r 720 mL of 0.175 M [tex]Na_3PO_4[/tex] is required to completely react with 126 mL of 0.150 M  [tex]CuCl_2[/tex].

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At the equivalence point moles H+ = moles OH- so pH = 7.00  is the pH of the resulting solution.

There are two ways to measure pH calorimetrically with indicator fluids or sheets and electrochemically with electrodes and a millivoltmeter for greater accuracy (pH meter).

Moles HClO₄ = 0.05 L x 0.100 M = 0.005

Moles NaOH = 0.02 L x 0.200 M=0.004

Moles HClO₄ in excess = 0.005 - 0.004 =0.001

Total volume = 0.07 L

[H+]= 0.001/ 0.07L=0.01428 M

pH = - log 0.01428=1.84

At the equivalence point moles H+ = moles OH- so pH = 7.00

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In space light waves move fastest, which is C. This is due to the fact that space is completely open and unrestricted and contains nothing that would do so.

What is Light waves?
The region of the electromagnetic spectrum that the human eye perceives as light, or visible light, is made up of electromagnetic radiation. Typically, visible light is characterised as having wavelengths between 400 and 700 nanometers (nm), or frequencies between 750 and 420 terahertz, which fall between the longer-wavelength infrared and the shorter-wavelength ultraviolet (with shorter wavelengths). The term "light" in physics can be used to more broadly describe electromagnetic radiation of any wavelength, whether or not it is visible. Gamma rays, X-rays, microwaves, and radio waves are all forms of light in this sense. Intensity, propagation direction, frequency or wavelength spectrum, and polarisation are the four main characteristics of light.

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Basic Oxygen Furnace Steelmaking is known as the dominant steelmaking technology, producing approximately 67% of the world's total output of crude steel.

More than half of the steel used in the world is produced using the basic oxygen process (BOP), which utilizes pure oxygen to turn a charge of liquid blast-furnace iron and scrap into steel.

In order to supersonically blow oxygen onto the charge, a vertically movable, water-cooled lance is inserted into the basic oxygen furnace (BOF), which is a tiltable converter lined with refractory (see figure).

Because the elements present in blast-furnace iron quickly oxidize when pure oxygen is used at high flow rates, only about 20 minutes are required for each heat, or to refine one charge.

Check the diagram below to see labels of an basic oxygen furnace ↓↓↓

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The food substance which gives energy for humans are the carbohydrates.

It follows that among the classes of food substances, the group of food or diet which has the highest calories supply of energy are the carbohydrates. These carbohydrates are the energy giving food.

Aside carbohydrates, other food classes include the following:

The proteins helps in building the body. The vitamins are the body regulating and protecting food.

So therefore, we can now deduce that when we consume foods such as rice, maize and others forms of carbohydrates, it gives us energy.

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It is the simplest whole number ratio of elements in a compound. Molecular formula is n times the empirical formula where n is integers 1,2,...The empirical formula is S₂O4.

Empirical formula gives the proportion of the element that is present in a compound. It does not give information about the actual number or the arrangements of the atoms.

The relation between emperical formula and molecular formula is given as

n=Molar mass ÷empirical formula molar mass    (1)

Where n= integers 1,2,3.....

Molar mass =128 g/mol

Empirical formula molar mass of SO₂=molar Mass of sulphur+2×Molar mass of oxygen                                                                                             (2)

Molar mass of sulfur= 32g/mol

molar mass of oxygen = 16g/mol

substituting the values in equation 2 we get

Empirical formula molar mass of SO₂=32g/mol+2× 16g/mol= 64g/mol

Substituting the values in equation (1) we get

n=128 g/mol÷ 64g/mol

n=  2

Molecular formula= n× empirical formula

                                = 2×SO₂

                                = S₂O4

Thus the molecular formula is S₂O4.

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fe3 ions were discovered to be 0.41 m in a suitable solvent of iron(iii) chloride. Iron(iii) chloride has a ksp of 0.82x1037.

The concentrations are "plugged in" after writing down the equation for Ksp to get the value for Ksp. Here is an illustration: Ag2CrO4 dissolves in water at a rate of 1.31 x 10-4 moles/L. Determine the Ksp value. The [Ag+] will increase by (2 x 1.31 x 10-4 moles/L) = 2.62 x 10-4 moles/L using mole ratios.

The equilibrium characteristic for the dissolving of a solid material in an aqueous solution is known as the item solubility constant, or solubility product constant. M is used to represent molar saturation, and products

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Answer:

Chlorine

Explanation:

Chlorination is the process of disinfecting drinking water by introducing chlorine to eradicate viruses, germs, and parasites. To get drinking water with safe levels of chlorine, various techniques can be utilized.

Another good example of this is when chlorine is added to public pools to protect it from viruses and diseases

Microbes - a microorganism, especially a bacterium causing disease or fermentation.

A chemical element with the atomic number 4 and the symbol Be is known as beryllium. It is an alkaline earth metal that is steel-gray in color, tough, light, and brittle. It is a divalent element that only naturally occurs in minerals when combined with other elements. Beryl and chrysoberyl are well-known gemstones that contain a lot of beryllium.

Any element's atomic number indicates how many protons or electrons are found in that element.

Since beryllium has an atomic number of 4, it is obvious that it contains 4 protons and 4 electrons.

On the other hand, the mass number of an element denotes the total number of protons and neutrons that make up an element's atomic nucleus.

Since beryllium has a mass of nine, there are also nine protons and neutrons in its mass.

Thus, there are 9 - 4 = 5 neutrons in the system.

As a result, there are 4, 4, and 5 protons, electrons, and neutrons present in beryllium, respectively.

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Option A is correct. a standard comparison of measurements. Regardless of precision and accuracy, all measurements are subject to some degree of uncertainty.

This is due to two things: the measuring device's limitations (systematic error) and the measurement skills of the experimenter (random error). A variance or its square root, which is a standard deviation, is used to measure uncertainty. The term "standard error" is also (and more frequently) used to refer to a statistic's standard deviation. Variability leads to the emergence of uncertainty. The standard deviation serves as the foundation for the definition of standard uncertainty, which is represented by a small u. Here, it's important to emphasize three key aspects of standard uncertainty: Even for non-normally distributed quantities, the standard deviation can be calculated.

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The amount of energy required to change a liquid to a gas is called the__enthalpy of vapourization_

The amount of energy required to change a solid to a liquid is called the ___fusing (melting)__

In the ___solid___ state, particles interact so strongly that the only movement is in the form of _vibration_.

If enough energy is added, the particles can escape the strongest interactions and move freely, _gaseous__ phase.

A substance's behaviour of its atoms and molecules is referred to as its "state of matter." Generally speaking, matter exists in three states: Solids have a distinct shape and are comparatively hard. The molecules and atoms in a solid are bound to one another. Instead of moving, they only vibrate still.

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NO2 is the correct Covalent Compound

Covalent compounds are formed when elements share electrons in a covalent bond to form molecules. Covalent compounds are formed when two nonmetals react with each other.

All others are ionic. Ionic compounds are (usually) formed when a metal reacts with a non-metal. As in the case of LiCl, AlCl3, and Na2S.

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Answer:

NO2

Explanation:

Five examples of covalent bonds are hydrogen (H₂), oxygen (O₂), nitrogen (N₂), water (H₂O), and methane(CH₄). 2. What is a covalent bond? A chemical bond involving the sharing of electron pairs between atoms is known as a covalent bond.

So therefore the answer is NO2

Explanation:

The molecular formulas for the reactants and products are:

Aluminum acetate - Al(CH3COO)3

Potassium hydroxide - KOH

Aluminum hydroxide - Al(OH)3

Potassium acetate - KCH3COO

Therefore the unbalanced reaction equation can be written as:

Al(CH3COO)3+KOH→Al(OH)3+KCH3COO

Rounding to the appropriate number of significant digits is equal to: B. 3.373.

In Mathematics, a significant figure can be defined as the number of digits in a numerical data (value), typically a measurement, which enhances its degree of accuracy.

In this exercise, you're required to evaluate the given mathematical expression by subtracting the numerical data (2.005) from the numerical data (5.37801), and then round to the appropriate number of significant digits as follows:

Expression = 5.37801 - 2.005.

Expression = 3.37301

Next, we would round up to four (4) significant figures because the last significant figure before zero (0) is eight (8):

Expression = 3.373

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The correct statements regarding ion-dipole interactions includes:

An ion-dipole interaction is described as the intermolecular force of attraction between a charge ion (cation or anion) and a molecule. It is found commonly in the solution where ionic compounds dissolve in polar solvents.

The sodium chloride molecule is an example of the Ion-dipole interaction.

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The following assumptions are made:

1. Air behaves like an ideal gas throughout the process.

2. The initial pressure will be equal to the atmospheric pressure at sea level, 1atm.

3. The temperature remains constant.

Taking into account the above, we can apply the Boyle-Marriote Law that relates the change in pressure and volume at constant temperature. The equation tells us:

Where,

P1 is the initial pressure, 1atm

V1 is the initial volume, 5300L

P2 is the final pressure inside the air tank, this is our unknown

V2 is the final volume, this will be calculated using the volume equation for a sphere:

r is the radius of the sphere, 63.0cm/2=31.5cm

So, the volume of the air tank will be:

We clear P2 and replace the known data:

The air must be compressed at 40.5atm

Answer: 40.5

NADPH is not produced during the Krebs cycle.

The Krebs cycle, sometimes referred to as the TCA cycle or the citric acid cycle, is a series of chemical processes that take place in the mitochondria and are essential for aerobic respiration, the process by which practically all living things generate energy. It consumes oxygen and produces water and carbon dioxide as waste. Here, ATP is created from ADP. As a result of this cycle, hydrogen and electrons are needed to carry an electron chain.

One Krebs cycle generates two ATPs.

The Krebs cycle produces four CO2, six NADH, two FADH2, and two ATPs for every glucose molecule that is completely oxidized.

The Krebs cycle occurs in mitochondria, which are present in all eukaryotes. The cycle occurs in the mitochondrial matrix and results in the production of chemical energy in the forms of ATP, FADH2, and NADH. These are created when pyruvate, the byproduct of glycolysis, is oxidized.

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Answer:

3.39 mol

Explanation:

n = m/M, where n is moles, m is mass and M is molar mass.

n = 149/44.01

n = 3.38559418314 mol

n = 3.39 mol

Hope that helps

Some fit dogs can tolerate up to 2-hour walks and many hours of hikes.

As a rule of thumb, a dog can walk for 5 minutes each month for 8 weeks. That means a 2-month-old puppy can walk for about 10 minutes. Also, a 3-month-old baby can walk for 15 minutes. 20 minutes for a 4-month-old child. There is no limit to how far you can walk your dog, as long as your dog is comfortable. For some dogs, it's around the block.

Ten miles for others. Remember to build up distance and endurance gradually over time. Rest days are more likely to focus on being together than on fulfilling the duty of walking the dog so rest days should be spent with humans. It is often beneficial for dog bonding. PetMD says he recommends walking the dog for 10 to 15 minutes with her two to three times a week.

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Round off .00042557 to three significant digits is = 0.000426

Given

The digit of 00042557

Three significant digits is 0.000426

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Facts about toy cars is toy car move with a friction motor

Toy car means a miniature nonfunctioning replica of car and this is play a children called as toy car and the fact of toy car is

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The nucleus, which has a positive charge, is the center of an atom. The nucleus of an atom contains almost all of its mass, and the electrons orbit the nucleus in precise ways.

DNA is organized into chromosomes and is located in the nucleus, which is in the center of each cell. A double nuclear membrane (outer and inner) that separates the cytoplasm from the nucleus is called the nuclear envelope, which encircles the cell. The nucleus houses the genes, structures that hold the hereditary information, and regulates and controls the functions of the cell (such as growth and metabolism). In the nucleus, nucleoli, which are tiny bodies, are frequently seen. Nucleoplasm is the matrix that resembles a gel and contains the various nuclear parts.

The nucleus of a cell is made up of chromosomes, nucleoplasm, nucleolus, and a nuclear membrane known as the nuclear envelope. The matrix that exists within the nucleus is referred to as nucleoplasm, also known as karyoplasm. The cytoplasm and the nucleus' components are separated by the nuclear membrane.

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Answer:

Explanation:

Vinegar contains acetic acid, and baking soda is sodium hydrogen carbonate. When they are combined, a reaction occurs and bubbles form. Which gas is in the bubbles, and why do the bubbles form? Oxygen gas forms because an acid reacts with a metal.

( if you want to copy and paste make sure to rephrase it)

Blue had a greater affinity for the solvent in water and pink had greater affinity for the paper.

Separation method based on a binding interaction between immobilized ligand and binding partner is called Affinity chromatography.

It is more preferable to use less polar solvent, for example ethanol, so that the non-polar compounds travel up the paper while the polar compounds stick to the paper, hence, separating them

Affinity chromatography has become very important in work with biological samples and pharmaceutical agents.

To achieve accurate results with affinity chromatography:

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Chromatography is primarily used as a method for the analysis and separation of chemical mixtures. Chromatography is the process of causing the constituent parts of a mixture to migrate differently from a restricted starting point in a particular medium, in this case, filter paper.

A) The air pressure above the beaker would disrupt the flow of the spots through the TLC, resulting in less resolution on the TLC plate, if the watch glass is not kept above the beaker for running paper chromatography. Despots would look, and even swarm, as a result.

B) The solvent is not allowed to move completely through the TLC plate because if the chromatogram is left in the beaker for a long time so that the solvent completely flows to the top, all of the spots would reach the solvent front and we would be unable to distinguish between the spots present in the TLC plate.

C). The TLC spotting should be performed in a very minute manner. Assume that if this substance is quite thick and a few of spots are seen apart, the TLC plate would drag and the resolution would be thrown off. As a result, it is challenging to tell the spots apart.

D). If the chromatographic paper is very short, it will be difficult to distinguish between the spots because, if more than one spot is present in a given compound, it will be harder to determine how many spots there are if there is a smaller distance between them. The TLC sheet's shorter length is the cause of the decreased space between the supports. Therefore, it is preferable to avoid using this longer TLC sheet so that the resolution is high and the spots can be easily identified.

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Divers are most at risk when they return to the surface due to the decreased solubility of nitrogen gas in the blood.

In the reaction, the acid is H₂Se, the base is H₂0, the conjugate acid is H₃O⁺, and the conjugate base is SeH.

Increasing the concentration of HA will increase the number of red (H₃O⁺) and blue (A⁻) particles in the solution in chemical equilibrium.

Divers are individuals who dive to great depths in the oceans.

Divers may dive freely without extra gas cylinders or they may dive with gas cylinders containing a mixture of oxygen and nitrogen.

Since gas solubility increases with pressure and decreases with pressure, nitrogen gas bubbles form as divers surface from the depths.

2. Acids are substances that donate protons, whereas bases accept protons.

Conjugate acids are formed when acids donate protons, whereas conjugate bases are formed when bases accept protons.

3. The equation of the reaction is given below:

According to the principle of chemical equilibrium, equilibrium will shift to a position that annuls any constraint placed on the system in equilibrium.

Therefore, increasing the concentration of Ha will result in an increase in H₃O⁺ and A⁻ particles in the solution.

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Answer:

Explanation:

The heater may still work for a few seconds because of the battery, and until the wind starts again the heater would not work