1. A 35. 3 g of element M is reacted with nitrogen to produce 43. 5 g of compo und M3N2. What is (i) the molar mass of the element and (ii) name of the element?

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Gravity, as a fundamental force of nature, is influenced by several factors. The following are some of the key factors affecting gravity:

By taking into account the different seating possibilities for the biologists, chemists, and physicists, you will find that the total number of valid seating arrangements is indeed 32.

Your approach is incorrect because it does not consider all possible arrangements that satisfy the given conditions. Let's analyze your approach step by step.

You correctly start by seating one biologist, which can be done in 1 way. However, when you proceed to seat the second biologist, you assume that there are 3 choices. This is where the error occurs.

Consider the following possibilities:

If the first biologist is seated at Chair 1, the second biologist cannot be seated at Chair 2 or Chair 6, as they would be sitting next to each other. Therefore, the second biologist can only be seated at Chair 4.

If the first biologist is seated at Chair 2, the second biologist can only be seated at Chair 5.

If the first biologist is seated at Chair 3, the second biologist can only be seated at Chair 6 or Chair 1.

If the first biologist is seated at Chair 4, the second biologist can only be seated at Chair 1.

If the first biologist is seated at Chair 5, the second biologist can only be seated at Chair 2.

If the first biologist is seated at Chair 6, the second biologist can only be seated at Chair 3.

So, there are actually 6 different arrangements for seating the two biologists.

Now, if we continue with your approach, seating the chemists and physicists, we need to consider the additional possibilities that arise due to the constraints of the biologist's seating arrangements.

Therefore, the correct approach would involve considering all possible arrangements that satisfy the given conditions. By taking into account the different seating possibilities for the biologists, chemists, and physicists, you will find that the total number of valid seating arrangements is indeed 32.

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The part of the solution that is the bigger proportion of the solution is the Solvent.

A solvent is that component of a solution that completely dissolves the solute in it to form a homogenous mixture “solution”. In addition to being a liquid, a supercritical fluid, a solid, or a gas can also be a solvent.

The solution is a homogenous mixture composed of Solvent (larger in concentration) and Solute (smaller in concentration).

A homogenous mixture of two or more than two components is termed as a solution. The material with the highest concentration is referred to as the solvent, while the substance with the lowest concentration is referred to as a solute.

Hence, the part of the solution that is the bigger proportion of the solution is the Solvent.

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[H⁺] = 3 × 10⁻² M = acidic

[H⁺] = 6 × 10⁻¹⁰ M = basic

[H⁺] = 1 × 10⁻⁴ M = acidic

[OH⁻] = 3 × 10⁻⁴ M = basic

The concentration of the H⁺ is as :

[H⁺] = 3 × 10⁻² M

The expression for the pH is as :

pH = - log ([H⁺)

pH = - log ( 3 × 10⁻² )

pH = 1.5 , acidic

The concentration of the H⁺ is as :

[H⁺] = 6 × 10⁻¹⁰  M

The expression for the pH is as :

pH = - log ([H⁺)

pH = - log ( 6 × 10⁻¹⁰  )

pH = 9.2 , basic

The concentration of the H⁺ is as :

[H⁺] =  1 × 10⁻⁴  M

The expression for the pH is as :

pH = - log ([H⁺)

pH = - log (  1 × 10⁻⁴  )

pH = 4, acidic

The concentration of the OH⁻ is as :

[OH⁻] =  3 × 10⁻⁴  M

The expression for the pH is as :

pOH = - log (OH⁻)

pOH = - log (  3 × 10⁻⁴  )

pOH = 3.5

pH = 14 - pOH

pH = 14 - 3.5

pH = 10.5

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answer and explanation

1 L = 1000 mL

and so to determine 7.8L we can o the calculation as follows

x mL = 1000 mL/ 1 L x 7.8 L/1 = 7800 mL/1 = 7800 mL

The name given to the accumulation of acid-forming particles on a surface is acid deposition. This refers to the deposition of acidic substances, such as sulfur dioxide (SO2) and nitrogen oxides (NOx), onto the surface of objects or buildings. These substances can come from natural sources, such as volcanoes, but are often the result of human activities, such as burning fossil fuels.

Acid deposition can have harmful effects on the environment, including damage to forests, crops, and aquatic ecosystems. It can also have negative effects on human health, such as respiratory problems and cardiovascular disease. Efforts to reduce acid deposition include the use of cleaner energy sources and the implementation of emissions regulations.
Acid deposition occurs when these particles are emitted into the atmosphere by various sources, like fossil fuel combustion or industrial processes, and then return to the Earth's surface through rain, snow, fog, or dry deposition. The resulting acidic environment can cause damage to ecosystems, infrastructure, and human health. To mitigate this issue, efforts are being made to reduce emissions and implement more sustainable practices.

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Answer:

False

Explanation:

R = gas constant = 0.0821 atm•L/mol•K

A chemical production company annually produces 500 million pounds of the chemical maleic anhydride using four different reactors. Each reactor can be run on only one of the four settings.

This means that each reactor contributes to the production process by running on a specific setting. The specific settings may vary depending on factors such as temperature, pressure, or other variables relevant to the production of maleic anhydride.

By utilizing all four reactors and their respective settings, the company can achieve the desired annual production of 500 million pounds. Each reactor plays a crucial role in the overall process, ensuring that the necessary quantity of maleic anhydride is produced efficiently and effectively.

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The range of the of the oxidation number of the first transition series is +2 to +6.

Transition elements or transition metals are elements or metals that have partially filled d orbitals.

The first main transition series begins with either;

Thus, the range of the of the oxidation number of the first transition series is +2 to +6.

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A 20.0 gram sample of alum is heated to drive off all of the water from the solid . 16.4 grams is the mass of the dehydrated

The mass of the dehydrated alum can be found by subtracting the mass of water that was driven off from the initial mass of the sample. Since all of the water is being driven off, we can assume that the mass of water is equal to the difference between the initial mass and the mass of the dehydrated alum.
To find the mass of water, we need to know the formula of alum and the percentage of water in it. The formula of alum is usually given as Al₂(SO₄)³·nH₂O, where n represents the number of water molecules per formula unit. In this case, we don't know the value of n, so we need to look it up or calculate it from the percentage of water in the sample.
Let's assume that the percentage of water in the sample is 18%, which is a common value for alum. This means that for every 100 grams of alum, there are 18 grams of water. Therefore, for a 20 gram sample of alum, the mass of water is:
Mass of water = 20 g x 0.18 = 3.6 g
Now we can calculate the mass of the dehydrated alum:
Mass of dehydrated alum = 20 g - 3.6 g = 16.4 g
Therefore, the mass of the dehydrated alum is 16.4 grams.

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Answer:

the answer is  D

Explanation:

brainliest?

Answer:

A) Chemical Change

Explanation:

Chemical changes occur when bonds are broken and formed between molecules or atoms. This means that one substance with a particular set of properties (such as melting point, color, taste, etc.) is turned into a different substance with different properties.

Answer:

Here we were given the weight of Ca as 80g

and the atomic mass of carbon is 40u(molar mass)

using the formula

where w is weight and m is molar mass

80/40

=2

therefore, there are 2 moles in 80g of calcium

answer: bits of rock rusting when exposed to oxygen and water

Explanation: i think because when it rains the water is left and freezes and night making the rock expand or start to Rust

The total heat energy required is expressed according to the formula:

where:

Qvap is the heat energy absorbed by the vapor

Qw is the heat energy absorbed by the water

Get the heat energy absorbed by the vapor at 100 degrees

Given the following parameters;

Mass of water = 100g

Molar mass of water (H2O) = 18.015g/mol

Hvap,w = 2259 J/g = 40.8 kJ/mol

Substitute the given parameters into the formula to have:

Get the heat absorbed by the water from 30 to 100 degrees and from 100 to 110 degrees using the formula below. Note that the water vapor is being heated without any phase changes, so we will be utilizing the specific heat capacity of water vapor.

Get the total heat energy required;

Answer:

False

Explanation:

Answer:

:0

Explanation:

True, You can typically get your original sample back when utilizing functional group tests and elemental analysis to try to figure out a compound's structure.

In an elemental analysis, the sodium test, also known as Lassaigne's test, is used to determine whether certain foreign elements, such as halogens, nitrogen, sulfur, and phosphorus, are present in an organic compound.

The four primary methods are mass spectrometry, nuclear magnetic resonance (NMR) spectroscopy, infrared (IR), and ultraviolet and visible spectroscopy. A minimal amount of sample is required for spectroscopy, and after an IR, NMR, or UV spectrum has been generated, the sample can be reused.

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The impurities are defined as the substances which are present in smaller quantities. It is in the filtrate the impurities are located after the recrystallization. The correct option is C.

A physical method which is used to purify the chemicals based on their different solubility is defined as the recrystallization. In this technique the products is dissolved in the solvent, then allowed to cool. The cooling of the crystals of the product will reform producing a purer product.

The impure substance will crystallize in a purer form because the impurities won't crystallize yet, therefore leaving the impurities behind the solution.

Thus the correct option is C.

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ANSWER

The final volume of the solution is 1900mL

EXPLANATION

Given information

The initial volume is 380mL

The initial concentration is 0.47M

The final concentration is 0.094M

To find the final volume of the solution, follow the steps below

Step 1: Write the dilution formula

Step 1: Substitute the given data into the formula in step 1

Let the final volume be V2

Hence, the final volume of the solution is 1900mL

It will take approximately 49,580 years for 80% of the plutonium-239 isotope to decay.

To determine the time required for 80% of the plutonium-239 isotope to decay, we can use the concept of half-life. The half-life of a radioactive isotope is the time it takes for half of the initial amount of the isotope to decay.

Given that the half-life of plutonium-239 is 24,360 years, we can calculate the number of half-lives required for 80% decay. Since each half-life reduces the amount of the isotope by half, we need to find how many times we need to divide 10 g (the initial amount) by 2 to reach 80% of the original amount.

Let's calculate:

Initial amount = 10 g

Amount after one half-life = 10 g / 2 = 5 g

Amount after two half-lives = 5 g / 2 = 2.5 g

Amount after three half-lives = 2.5 g / 2 = 1.25 g

Amount after four half-lives = 1.25 g / 2 = 0.625 g

We can see that after four half-lives, the amount remaining is less than 20% of the initial amount. Since each half-life is 24,360 years, the time required for four half-lives is approximately 97,440 years. Therefore, it will take approximately 49,580 years (97,440 years - 47,880 years) for 80% of the plutonium-239 isotope to decay.

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The substance in the image above would be classified as a mixture of elements (option E).

A compound is a substance formed by chemical bonding of two or more elements in definite proportions by weight.

On the other hand, a mixture is made when two or more substances are combined, but they are not combined chemically.

According to this question, an image is shown with two different substances or elements as distinguished by coloration (white and purple). These elements are combined but not chemically bonded, hence, is a mixture.

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Carbon-14 has a half-life of approximately 5730 years. This means that the amount of carbon-14 in an item will decay by half after 5730 years. Therefore, approximately 25 grams of carbon-14 will be left after 100 years.

If you have 50 grams of carbon-14 today and want to determine how much will be left in 100 years, we can calculate the number of half-lives that will occur in that time period.

The number of half-lives can be found by dividing the elapsed time (100 years) by the half-life of carbon-14 (5730 years):

Number of half-lives = Elapsed time / Half-life

Number of half-lives = 100 years / 5730 years ≈ 0.0174 half-lives

Since we cannot have a fraction of a half-life, we consider the closest whole number, which in this case is 0 (no complete half-lives).

Since no complete half-lives have occurred in 100 years, the amount of carbon-14 remaining will still be approximately half of the initial amount. Therefore, approximately 25 grams of carbon-14 will be left after 100 years.

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Let's see the balanced equation

\(\\ \rm\Rrightarrow 2Ca+O_2\longrightarrow 2CaO\)

Hence

As moles are equal given

Answer:

C: Most particles in the plasma are heavy, slow, and very low density.

Explanation:

i'm smart like dat

Answer:

C is correct

Explanation:

Step 1

The reaction:

CaCO3 + heat => CaO + CO2 (completed and balanced)

-----------------------

Step 2

Information provided:

Actual yield = 0.53

Answer:

the last one it increases number of collisions by speeding up the particle motion

Explanation:

the more thermal energy something it has the faster particles move

Based on the recipe for preparing the food, the limiting ingredient is the 2 cans of tomatoes.

The recipe for the food is given below:

Hence, 2 cans of diced tomatoes require 1 cup of green beans, 1/2 cup of pasta, 1 can of beans, and 4 of cups broth.

Hence, after, the 2 cans of diced tomatoes are used up, no more food can be prepared.

A limiting reagent or limiting ingredient is used up when cooking, hence, the 2 cans of tomatoes are the limiting ingredient.

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