The total amount of energy before and after a chemical reaction is the same. Therefore, energy is _____

Answer:

A

Explanation:

Explanation:

beryllium must loss 2 electrons to form a stable octet to its nearest noble gas Helium.

It can loss electron because it is a metal and is placed in 2group and 2 period in group of alkaline earth metals.

hope this helps you to.

Answer:

Explanation:

Because you only have one repeat unit, n=1. 2n-1 becomes 2(1)-1 which is equal to one, meaning one molecule of H2O is produced, as is shown by the top condensation polymerisation reaction.

If you had two repeat units, n=2 so 2n-1=3. Three H2O molecules are produced because you would need two molecules of each reactant so three condesation reactions would occur and three molecules of H2O would be released.

Answer:

because the salt will melt the egg shell because of whats in the salt

i tried i didnt really know the answer LOL

Explanation:

Answer:

V= L × W × H so the answer is 240,000

Answer:

800 kJ

Explanation:

Answer:

800 kj

Explanation:

the line is at 800

Answer:

LiOH

Explanation:

LiOH has the tag "aq" which stands for aquatic.

Our answer is LiOH.

Explanation:

H2S is the limiting reagent

H2S= 1/8 (least value)

O2= 1/4

Answer:

2000 Liters

Explanation:

1 cubic meter is equal to 1000 liters

using that same conversion fact we get

2 cubic meters X 1000 Liters = 2000 Liters

Answer:

There are required 6162J to raise the temperature of the piece of granite from 82°C to 212°C

Explanation:

By using the equation:

Q = m×C×ΔT

Where Q is heat in J, our incognite

m is mass of the substance, 0.0600kg = 60.0g

C is specific heat, 0.790J/g°C

And ΔT is change in temperature, 212°C - 82°C = 130°C

Replacing:

Q = m×C×ΔT

Q = 60.0g×0.790J/g°C×130°C

Q = 6162J

Approximately 12.45 grams of solid silver chromate will precipitate when 150 mL of 0.500 M silver nitrate solution is added to excess potassium chromate.

To determine the number of moles of AgNO3 present in 150 mL of a 0.500 M AgNO3 solution, we can use the formula:

moles = concentration × volume

Given:

Concentration of AgNO3 solution = 0.500 M

Volume of AgNO3 solution = 150 mL

First, we need to convert the volume from milliliters (mL) to liters (L) since the concentration is given in moles per liter (M).

1 L = 1000 mL

Therefore, the volume of the AgNO3 solution in liters is:

150 mL × (1 L / 1000 mL) = 0.150 L

Now we can calculate the moles of AgNO3 using the formula:

moles = concentration × volume

moles = 0.500 M × 0.150 L

moles = 0.075 mol

So, there are 0.075 moles of AgNO3 present in 150 mL of the 0.500 M AgNO3 solution.

Now, let's proceed to determine how many grams of solid silver chromate (Ag2CrO4) will precipitate when the AgNO3 solution reacts with excess potassium chromate (K2CrO4).

From the balanced chemical equation:

2AgNO3(aq) + K2CrO4(aq) → Ag2CrO4(s) + 2KNO3(aq)

We can see that the molar ratio between AgNO3 and Ag2CrO4 is 2:1. Therefore, for every 2 moles of AgNO3, we will form 1 mole of Ag2CrO4.

Since we have 0.075 moles of AgNO3, we can calculate the moles of Ag2CrO4 formed:

moles of Ag2CrO4 = 0.075 mol / 2 = 0.0375 mol

To determine the mass of Ag2CrO4, we need to multiply the moles by its molar mass. The molar mass of Ag2CrO4 is calculated by summing the atomic masses of each element in the compound:

Ag2CrO4 = 2(Ag) + 1(Cr) + 4(O) = 2(107.87 g/mol) + 1(52.00 g/mol) + 4(16.00 g/mol) = 331.87 g/mol

mass of Ag2CrO4 = moles of Ag2CrO4 × molar mass of Ag2CrO4

mass of Ag2CrO4 = 0.0375 mol × 331.87 g/mol = 12.45 g

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The concentration progressively increased as the water from the solution evaporated. This is because the amount in the flask would stay the same but the amount of water would decrease.

The atomic weight of sodium chloride (NaCl) is 58.44, which equals 58.44 grammes. If you mix 1 litre of finished solution with 58.44g of NaCl.

One gramme of solute is present in a 100 milliliter final volume one percent solution. For instance, a 1% NaCl solution is made by dissolving 1 g of sodium chloride in 100 ml of distilled water.

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The answer is never because there's no electricity

Answer:

never is the correct answer

Explanation:

If we are considering things from the point of view of hedonism, the best answer would be-

Some pleasures are easy to experience, temporary, and are primarily about satisfying physical needs - but not all pleasures are like this. Hedonism is a philosophical concept that emphasizes the pursuit of pleasure and the avoidance of pain as the ultimate goals of life. However, hedonism does not necessarily argue that all pleasures are purely physical or solely focused on immediate gratification. It recognizes that there can be different kinds of pleasures, including intellectual, spiritual pleasures, which may not be solely tied to satisfying physical needs.

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Answer:

displacement rxn takes place

Explanation:

Zn +FeCl2 → ZnCl2 +Fe

The secretion of potassium ions (K+) into the filtrate is primarily regulated by the hormone aldosterone, which is produced by the adrenal glands.

Aldosterone acts on the cells of the distal tubules and collecting ducts in the kidneys to regulate the reabsorption and secretion of various ions, including potassium.

When the body needs to retain potassium, aldosterone is released and acts on the cells of the distal tubules and collecting ducts to enhance the reabsorption of sodium ions (Na+) and the secretion of potassium ions (K+) into the filtrate.

This increases the concentration of potassium in the urine and reduces its excretion from the body.

Conversely, when the body needs to eliminate excess potassium, aldosterone secretion is reduced. This leads to decreased reabsorption of sodium and increased secretion of potassium in the distal tubules and collecting ducts, resulting in increased excretion of potassium in the urine.

Other factors that can influence the secretion of potassium into the filtrate include changes in the concentration of potassium in the blood, pH levels, and the activity of other hormones, such as angiotensin II and atrial natriuretic peptide (ANP), which can modulate the effects of aldosterone.

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If the balloon is closed, then yes, both volume and pressure will increase when the gas inside is heated.

What is pressure?

Pressure is the force applied perpendicular to the surface of an object per unit area over which that force is distributed.

Various units are used to express pressure. Some of these are units of force divided by units of area. For example, the SI unit of pressure, Pascal (Pa), is 1 Newton per square meter (N/m2). Similarly, pounds force per square inch (psi, symbol lbf/in2) is the traditional unit of pressure in imperial and US systems. Pressure can also be expressed as standard atmospheric pressure. Atmospheric pressure (atm) is equal to this pressure and torr is defined as 1/760 of this. Manometric units such as centimeters of water, millimeters of mercury, and inches of mercury are used to express pressure as the height of a particular liquid column within a manometer.

If the balloon is closed, then yes, both volume and pressure will increase when the gas inside is heated.

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The principle of option D. Uniformitarianism states that the physical, chemical, and biological processes at work shaping the Earth today have also operated in the

Option D. Uniformitarianism is the principle stating that the physical, chemical, and biological processes at work shaping the Earth today have also operated in the geologic past. It is based on the idea that the present is the key to the past. In other words, the same natural laws that operate in the universe today have been operating since the beginning of time.

James Hutton was the first to propose this principle in the late 18th century. He suggested that the Earth was shaped by slow-acting geological forces such as erosion, sedimentation, and uplift over long periods of time. He believed that the same processes were still happening today and that they had operated in the past.

This principle is an important concept in geology because it allows scientists to interpret the Earth's history based on the processes that they observe today. By understanding how these processes work and how they have changed over time, scientists can reconstruct the history of the Earth and its environments.

Uniformitarianism has been tested and proven through many observations and experiments. For example, the study of sedimentary rocks has shown that they were formed in the past through the same processes that are observed today, such as deposition of sediment by water, wind, or ice.

Similarly, the study of volcanoes has shown that they are formed by the same processes as today, such as the movement of magma from deep within the Earth.

In conclusion, Uniformitarianism is the principle that allows us to interpret the Earth's history by observing the processes that shape it today. It is a fundamental concept in geology and has been tested and proven through many observations and experiments.

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15.12 is the number of moles of oxygen in 454.3 g of sodium hydrogen phosphate (\(NaH{2}PO_{4}\))

To determine the number of moles of oxygen in 454.3 g of sodium hydrogen phosphate (\(NaH{2}PO_{4}\)), we need to use the molar mass and the formula of the compound.

The molar mass of \(NaH{2}PO_{4}\) can be calculated by adding up the atomic masses of each element in the formula:

Na: 22.99 g/mol

H: 1.01 g/mol (2 hydrogen atoms)

P: 30.97 g/mol

O: 16.00 g/mol (4 oxygen atoms)

Molar mass of \(NaH{2}PO_{4}\) = (22.99 g/mol) + (1.01 g/mol × 2) + 30.97 g/mol + (16.00 g/mol × 4) = 120.00 g/mol

Now, we can use the molar mass to calculate the number of moles of \(NaH{2}PO_{4}\):

Number of moles = Mass of substance / Molar mass

Number of moles of \(NaH{2}PO_{4}\) = 454.3 g / 120.00 g/mol ≈ 3.78 moles

Since there are four oxygen atoms in one molecule of \(NaH{2}PO_{4}\), we can calculate the number of moles of oxygen by multiplying the number of moles of \(NaH{2}PO_{4}\) by the ratio of oxygen atoms to \(NaH{2}PO_{4}\) molecules:

Number of moles of oxygen = 3.78 moles × 4 = 15.12 moles

Therefore, there are approximately 15.12 moles of oxygen in 454.3 g of sodium hydrogen phosphate.

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Answer:

26.85 grams

Explanation:

The formula for mole calculations is number of moles = given mass/gram-formula mass.

The number of moles is given to us, which is 0.125.

The gram formula mass of SnSO4 is about 214.77.

Plug in the values we have into the equation. It should look like this:

0.125 = x / 214.77

Solve for x by multiplying 214.77 and 0.125. The answer should be about 26.85 grams.

Here are the typical sections that you should include in your report:

Title Page - This page should contain the title of your experiment, your name, your instructor's name, and the date the experiment was conducted.

Introduction - In this section, you should provide some background information on pH and why it is important to measure it. You should also state the objectives of the experiment and describe the methodology you used.

Materials and Methods - This section should include a list of all the materials you used in the experiment, as well as a step-by-step description of the procedure you followed to measure pH. Be sure to include any safety precautions you took during the experiment.

Results - In this section, you should present the data you collected during the experiment. You should include tables, graphs, or figures to illustrate your results. You should also provide a written explanation of your findings.

Discussion - In this section, you should interpret your results and explain what they mean in terms of the objectives of the experiment. You should also discuss any sources of error that may have affected your results, and suggest ways to improve the experiment in the future.

Conclusion - In this section, you should summarize your findings and state whether or not your objectives were achieved.

References - This section should include a list of any sources you consulted during the experiment, such as textbooks, journal articles, or websites.

Appendices - This section should include any additional information that is relevant to the experiment but not included in the main body of the report, such as raw data, calculations, or photographs.

When writing your lab report, be sure to follow the formatting and citation guidelines provided by your instructor or department. You may also want to consult a scientific writing guide or other resources to help you write a clear and concise report.

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A reaction between liquid reactants takes place at a sealed, evacuated vessel with a measured volume of 10 L. Measurements show that the reaction produced 20 L of carbon dioxide gas.

Carbon dioxide (CO2) gas is produced in a chemical reaction between two liquid reactants in a sealed, evacuated vessel with a measured volume of 10 L. The reaction is exothermic, indicating that it releases heat, as well as producing CO2. In the reaction, the carbon dioxide gas is formed by the combination of carbon and oxygen atoms in the reactants.

As a result, the number of moles of CO2 gas produced is directly proportional to the amount of liquid reactants present. The quantity of CO2 gas produced can also be calculated by using the gas laws and the measured volume of the gas.The Ideal Gas Law states that PV = nRT, where P is the pressure of the gas, V is the volume, n is the number of moles of gas, R is the universal gas constant, and T is the temperature. In this case, the volume of the gas produced is 20 L, and the pressure is unknown. If we assume that the temperature is constant, we can use the Ideal Gas Law to calculate the number of moles of CO2 gas produced.

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The monomer of the PVC polymer shown below is vinyl chloride. A monomer is a molecule that can be bonded to other identical molecules to form a polymer. In the case of PVC, the monomer vinyl chloride is bonded together to form the polymer polyvinyl chloride.

The structure of the vinyl chloride monomer is shown below:

CH2=CHCl

The double bond between the two carbon atoms allows for the monomer to bond with other vinyl chloride monomers to form the polymer PVC. The chlorine atom attached to one of the carbon atoms is what gives PVC its unique properties, such as its durability and resistance to water.

In summary, the monomer of the PVC polymer is vinyl chloride, which has the structure CH2=CHCl. This monomer is bonded together to form the polymer polyvinyl chloride, which is commonly used for water pipes and synthetic leather.

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NHCI is not a strong electrolyte. While, LiOH, HNO₃, KBr, and HNO are strong electrolytes. Therefore, option D is correct.

Electrolytes are substances that conduct electricity when dissolved in water or melted. They are composed of ions, which are electrically charged particles. In a solution or a molten state, electrolytes dissociate into their constituent ions, allowing the flow of electric current.

The most common electrolytes are salts, acids, and bases. When these substances dissolve in water, they break apart into positive and negative ions. The positive ions are called cations, and the negative ions are called anions.

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Answer:

1H, 2H, and 3H.

Explanation:

Answer:

torque =force*distance

This is an oxidation-reduction (redox) reaction:

2 Cu² + 2 e- → 2 Cu¹ (reduction)

2 I⁻¹ - 2 e- → 2 I⁰ (oxidation)

CuSO₄ is an oxidizing agent, KI is a reducing agent. Therefore Copper is being reduced and Iodine oxidized.

Answer:

Non point source pollution

Explanation:

Point source pollution is when any contaminant enter the environment from an easily from an easily identified and confined place.

Non point source pollution is pollutants released in a wide space. Including oil, grease, and toxic chemicals.  

Answer:

The beginning

Explanation:

In a nuclear reaction, the  rate of decay is fastest at the beginning of the process.

There are two types of nuclear reactions which are nuclear fusion and nuclear fission .They involve the combination and disintegration of the element's nucleus respectively.

In nuclear fission, the nucleus of the atom is bombarded with electrons of low energy which splits the nucleus in to two parts .Large amount of energy is released in the process.It is used in nuclear power reactors as it produces large amount of energy.

In nuclear fusion,on the other hand, is a reaction which occurs when two or more atoms combine to form a heavy nucleus.Large amount of energy is released in the process which is greater than that of the energy which is released in nuclear fission process.

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