14. A silver ring reacts with compounds containing sulfur in the air to form silver sulfide, a black substance that makes up the tarnish on the surface of silver objects. To remove the tarnish from the ring, students placed it in a pan lined with aluminum foil and added hot water. Baking soda was added to the hot water and stirred. Students made observations about the process. Which observation of this process provides evidence of a chemical reaction?

a. hot water heater the aluminum foil
b. the liquid solution changed color
c. hot water cooled
d. the pan was lined with aluminum foil ​

I need this ASAP I'm in a test

Answer:

The solubility of a saturated solution can be increased by increasing the temperature.

Explanation:

Temperature -- Generally, an increase in the temperature of the solution increases the solubility of a solid solute. For example, a greater amount of sugar will dissolve in warm water than in cold water. A few solid solutes, however, are less soluble in warmer solutions.

The loss of biological nitrogen fixation over a five-year period would have significant ecological and agricultural consequences, directly impacting ecosystems, food production, and potentially exacerbating environmental issues such as carbon dioxide emissions.

The consequences of the decrease in biological nitrogen fixation due to the spread of the bacteriophage over a period of five years would be significant. Here are the potential impacts and consequences:

1. Impact on Ecosystems: Nitrogen fixation plays a vital role in the nitrogen cycle, where nitrogen gas from the atmosphere is converted into a usable form by nitrogen-fixing bacteria. This fixed nitrogen is essential for the growth of plants and other organisms. With the death of nitrogen-fixing bacteria, there would be a reduction in the availability of fixed nitrogen in ecosystems. This could lead to nitrogen deficiency, limiting plant growth and overall productivity in various ecosystems.

2. Impact on Food Production: Nitrogen is a critical nutrient for plant growth and is often supplemented through nitrogen fixation. A decline in nitrogen fixation would result in decreased availability of nitrogen for crop plants, leading to reduced agricultural productivity. This could result in lower crop yields and potential food shortages, impacting food security for human populations.

3. Increased Reliance on Synthetic Fertilizers: With a decline in natural nitrogen fixation, there would be an increased reliance on synthetic fertilizers to meet the nitrogen requirements of crops. Synthetic fertilizers are manufactured using energy-intensive processes and can have negative environmental impacts, such as contributing to water pollution through runoff and greenhouse gas emissions during production. Increased usage of synthetic fertilizers would exacerbate these environmental issues.

4. Impact on Carbon Dioxide Emissions: Nitrogen fixation is closely linked to the cycling of carbon and nitrogen in ecosystems. Nitrogen availability affects the growth and productivity of plants, which in turn influences the uptake and storage of carbon dioxide through photosynthesis. A decrease in nitrogen fixation would potentially limit plant growth, leading to reduced carbon dioxide uptake by plants. This could contribute to increased atmospheric carbon dioxide levels and exacerbate climate change.

Overall, It is important to note that this scenario assumes a complete absence of biological nitrogen fixation, which is unlikely in reality due to the presence of non-targeted nitrogen-fixing bacteria and other mechanisms of nitrogen input in ecosystems.

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Answer:

Covalent bonds are formed by the sharing of electrons between two non-metallic atoms. These bonds are typically stronger and more stable than ionic bonds and are found in compounds such as water, hydrogen, and carbon dioxide. Covalent bonds differ from ionic bonds in that they do not involve the transfer of electrons from one atom to another.

Explanation:

To determine how much of solution A would be needed to generate the electrical energy used daily in the home

we need to calculate the ratio of the energy released by fusion of hydrogen to the electrical energy used daily.

Energy ratio = Energy released by fusion of hydrogen / Electrical energy used daily

Energy ratio = (8.4 x 10^12) / (3 x 10^8)

To simplify the calculation, we can convert the values to scientific notation with the same exponent:

Energy ratio = (8.4 / 3) x (10^12 / 10^8)

Energy ratio = 2.8 x 10^4

This means that for every unit of electrical energy used daily in the home, we would need 2.8 x 10^4 units of solution A to generate that energy.

Therefore, to generate the electrical energy used daily in the home, we would need 2.8 x 10^4 liters of solution A.

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Answer:

The answer is A.

Explanation:

They both used charged particles in their experiments.

The volume of a sample of nitrogen gas is 7.08 L

It is given that

volume of gas at 500°C = 10 L = 773 k

We have to find

volume of gas at 275°C = 548 k

Charles Law states that the volume of a given mass of a gas is directly proportional to its Kevin temperature at constant pressure. In mathematical terms, the relationship between temperature and volume is expressed as

The physical principle known as Charles' law states that the volume of a gas equals a constant value multiplied by its temperature as measured on the Kelvin scale (zero Kelvin corresponds to -273.15 degrees Celsius).

V1/T1 = V2/T2

10/773 = V2/548

V2 = 7.08 L

Hence, volume of a sample of nitrogen gas is 7.08 L

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Answer:Plasma is highest energy state of matter.It consists of electrons,protons and neutral particles.

Explanation:(1) Plasma has a very high electrical conductivity .

(2) The motion of electrons and ions in plasma produces it's own electric and magnetic field

(3)It is readily influenced by electric and magnetic fields .

(4)It produces it's on electromagnetic radiations.



When there is excess glucose and amino acids in the liver, and no more ATP needs to be synthesized, these energy-rich nutrients are converted to glycogen and fatty acids.

Both glycogen and fatty acids are forms of energy storage molecules.

What happens to excess glucose in the liver?

Excess glucose in the liver is stored as glycogen. When the body requires glucose for energy, glycogen is broken down to glucose in a process known as glycogenolysis.

Gluconeogenesis is the process by which glucose is generated from non-carbohydrate sources, such as amino acids and fatty acids.

When there is an excess of amino acids, the liver transforms them into glucose or fat as well. The body can use glucose and fat for energy or store it in adipose tissue for later use. Fatty acids are synthesized from acetyl-CoA units, which can be derived from both glucose and amino acids.

The liver is capable of maintaining glucose homeostasis in the body. It is capable of releasing glucose into the bloodstream, maintaining glucose levels at a stable level in the body when necessary.

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Answer:

false

Explanation:

can carry heat, not communication

Answer:

i think i like 14 or 8 atom

Explanation:

Answer: 2Ag + 2H2O + HgCl2 → 2AgCl + H2 + Hg(OH)2

Explanation: hope this helps, if so give me brainliest thanks!

The changes in properties can be used as evidence that a chemical reaction has occurred during the electrospinning process.

Electrospinning is a process that involves the use of an electric field to create fine fibers from a polymer solution. During electrospinning, it may be difficult to observe a physical change that indicates a chemical reaction is taking place.

However, if the polymer solution undergoes cross-linking or curing reactions during the electrospinning process, then the resulting fibers may have different mechanical, thermal, or chemical properties compared to the original polymer solution. These changes in properties can be used as evidence that a chemical reaction has occurred during the electrospinning process. For example, if the resulting fibers are insoluble in a solvent that could dissolve the original polymer solution, this could be an indication of cross-linking reactions taking place during electrospinning.

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Answer:

Water

Explanation:

When water freezes it forms a crystal lattice shape

Copper chloride would form a crystal lattice. Therefore, option D is correct.

In crystallography, a crystal lattice can be described as a description of the ordered arrangement of atoms, ions, or molecules in a crystalline material. Ordered structures take place from the intrinsic nature of the particles to form symmetric that repeat along the principal directions of 3-D space in matter.

The smallest group of atoms in the material that constitutes this repeating pattern is known as the unit cell. The unit cell fully reflects the symmetry and structure of the crystal, which is built up by the repetition of the unit cell along its principal axes.

The lengths of the principal axes of the unit cell and the angles are the lattice constants called lattice parameters. The symmetry properties of the crystal are based on the concept of space groups.

The crystal structure and symmetry determine many physical properties, such as electronic band structure, cleavage, and optical transparency.

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Answer:

Option ( 1 )

Explanation:

This atom has a cub close pack structure, and therefore - the number of edge center present in X atoms =  4,

Number of unit cells present in X atoms = 6

____________________________________________________

Now the 6th coordination number of X atom = 6 * 4 = 24,

So respectively, the 3rd coordination number of X = 8 -

And thus the ratio between the 6th coordination number and the 3rd coordination number = 24 / 8 = 3,

Option ( 1 )

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To make it stronger to a 70% solution, the pharmacist needs add 20.67 cm3 of pure alcohol to 10 cm3 of an 8% alcohol solution.

How much pure alcohol needs to be added to 400 millilitres of a 15% solution in order to increase its strength to 32%. To make the strength 32%, 100 mL of alcohol must be added. This is the appropriate response.

Calculating the amount of alcohol in the 10 cm3 of the 8% solution

8% of 10 cm³ = 0.08 x 10 cm³ = 0.8 cm³

As a result, the 10 cm3 of 8% solution contains 0.8 cm3 of alcohol.

Let's assume that x cm3 of pure alcohol is required to achieve a 70% solution. After adding pure alcohol, the solution will have a total volume of (10 + x) cm3.

Let's now construct an equation to find the value of x:

0.8 cm³ + x cm³ = 0.7 (10 + x) cm³

Simplifying and solving for x, we get:

0.8 cm³ + x cm³ = 7 cm³ + 0.7x cm³

0.3x cm³ = 6.2 cm³

x = 20.67 cm³

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The abbreviation 0.1 N HCl means normal hydrochloric acid.By comparing a solution to a standard solution with a known concentration, standardisation is the process of determining the precise concentration

By comparing a solution to a standard solution with a known concentration, standardisation is the process of determining the precise concentration of the solution. As precise concentration measurements are necessary for many scientific and industrial applications, it is a crucial stage in chemical analysis. In order to determine the concentration of the unknown solution, the standardisation procedure entails mixing a measured amount of the standard solution with a known quantity of the solution being tested. The primary standard, which is a pure material with a known and steady concentration, is often the standard solution. Standardization is used in many disciplines, including chemistry, biology, and engineering, to assure

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In an ecosystem in the hilly areas the should built its factory away from the river so that pollution does not reach the river.

Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.

Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.

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The conditions for a standard electrochemical cell. select one or more : pressure of 1 atm temperature of 298 k solution concentrations of 1 M.

The electrochemical cell is the cell that is capable of generating the electrical energy from the chemical reactions or by the use of the electrical energy to cause the chemical reaction. The conditions for a standard electrochemical cell. select one or more : pressure of 1 atm temperature of 298 k solution concentrations of 1 M.  

There are the two types of the electrochemical cells is as follows : the galvanic called the electrolytic cells. the galvanic cell is also called as the voltaic cell.

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The compound that would form a precipitate in water is  BaSO4.

option d.

BaSO4 (barium sulfate) would form a precipitate in water because it is classified as an insoluble compound according to most solubility charts. When a compound is considered insoluble, it means that it has a very low solubility in water, resulting in the formation of solid particles or precipitate when dissolved in water.

In the case of BaSO4, it does not readily dissociate into ions in water and remains as solid particles, causing it to precipitate.

On the other hand, a. KCI (potassium chloride), b. NaOH (sodium hydroxide), and c. (NH4)2S (ammonium sulfide) are soluble compounds in water. They dissociate into ions and form homogenous solutions when dissolved in water, without forming a precipitate.

It's worth noting that solubility can vary depending on factors such as temperature and concentration, so it's always important to consult a solubility chart or reference for accurate and up-to-date information on specific compounds.option d.

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Answer:

2 significant figures

Explanation:

0.19312

0.19 or 0.2

Answer:

VC = 18

Explanation:

Since L is the midpoint and you have LV, you know that LC is also 9.

Answer:

grese

Explanation:

Any liquid could absorb and release thermal energy. However, a refrigerant or a coolant absorbs heat and releases it to any area faster than any ordinary liquid such as water. So to complete the sentence: A refrigerant/cooler is a liquid that absorbs and releases thermal energy

Answer:

Coolant

Explanation:

Every liquid does that but

Coolant does it the fastest

Fusion occurs when two atoms slam together to form a heavier atom, like when two hydrogen atoms fuse to form one helium atom.

This process generates enormous amounts of energy, many times more than fission, and powers the sun. Furthermore, it doesn't generate radioactive fission products.

Scientists are studying fusion processes, but they are challenging to maintain for extended periods of time due to the extreme pressure and temperature required to fuse the nuclei together.

The new atom's total mass is less than the combined mass of the two that created it; according to Albert Einstein's famous E=mc2 equation, the "missing" mass is released as energy.

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The volume of a sample for coliform compliance is: 100 mL. The correct answer is option a.

This is because the EPA requires a minimum of 100 mL of water sample to be tested for coliform bacteria in order to comply with drinking water standards. Coliform bacteria are commonly found in the environment and can indicate the presence of harmful pathogens in drinking water.

Therefore, regular monitoring of coliform levels is essential to ensure that water is safe for human consumption.

It is important to note that the EPA also sets maximum contaminant levels (MCLs) for coliform bacteria, which are based on the number of colonies found in a specific volume of water. If the sample exceeds the MCL, further investigation and corrective action may be required to ensure the safety of the water supply.

In addition to coliform bacteria, other water quality parameters such as pH, turbidity, and disinfectant residual may also be monitored to ensure compliance with drinking water standards.

Therefore, option a is correct.

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Answer: Washing your hands with soap, and hand sanitizer.

Explanation:

The gas must be cooled to a temperature of 261.54 K (or about -11.6°C) to reduce its volume to 58.0 mL.

We use the combined gas law to solve this problem;

P₁V₁/T₁ = P₂V₂/T₂

where P is pressure, V is volume, and T is temperature.

Assuming that the pressure remains constant, we can rewrite the equation as;

V₁/T₁ = V₂/T₂

where V₁ is the initial volume (65.0 mL), T₁ is the initial temperature (295 K), V₂ is the final volume (58.0 mL), and T₂ is the final temperature that we need to find.

Solving for T₂, we get;

T₂ = (V₂/T₂) × T₁/V₁

T₂ = (58.0/65.0) × 295 K

T₂ = 261.54 K

Therefore, the gas must be cooled at 261.54 K temperature.

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Option A, BF, does not violate the octet rule, option B, XeO, satisfies the octet rule for all atoms, option C, Ne, is a noble gas and already has a complete octet, and option D, AICI3, has complete octets for both the atoms and does not violate any rules.

The incorrect Lewis structure is likely to be the one that violates the octet rule, has an incomplete octet or has an odd number of electrons.

In the given options, only option E, NH, violates the octet rule. Nitrogen has five valence electrons and each hydrogen has one valence electron. If we draw the Lewis structure for NH, we get three lone pairs on nitrogen and one unpaired electron.

This makes a total of nine valence electrons, which is one more than the total available. Therefore, NH does not follow the octet rule and is the incorrect Lewis structure.

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