A scientist measures the mass of
two liquids before and after combining
them. The mass after combining the
liquids is less than the sum of the masses
before. Where is the missing mass? What
type of change occurred? How do you
know?

The mass of KHP dissolved in 50.00 mL of the titrant is 0.5634 g.

KHP and NaOH react in a 1:1 ratio. That means that the amount of NaOH used is equal to the amount of KHP in the sample. We can calculate this amount:

c = n/V, so n = c * V = 0.049 M * 0.025 L = 0.001225 mol of NaOH and KHP

With this, we can calculate the amount of KHP in the 50.00 mL sample:
22.20 mL : 0.001225 mol = 50.00 mL : X

X = 0.001225 mol * 50.00 mL / 22.20 mL = 0.002759 mol

Finally, using the molar mass of KHP (204.22 g/mol), we calculate the mass of KHP in the titrant:

n = m/M, so m = n * M = 0.002759 mol * 204.22 g/mol = 0.5634 g

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The pH of the buffer solution is approximately 8.41.

To calculate the pH of a buffer solution, we can use the Henderson-Hasselbalch equation:

pH = pKa + log([A-]/[HA])

Given:

[HCN] = 0.80 M

[CN-] = 0.10 M

pKa = 9.31

First, we need to determine the ratio of [A-]/[HA]:

[A-]/[HA] = [CN-]/[HCN]

Substituting the given values:

[A-]/[HA] = 0.10 M / 0.80 M

[A-]/[HA] = 0.125

Now we can plug this ratio into the Henderson-Hasselbalch equation:

pH = 9.31 + log(0.125)

Using a calculator:

pH ≈ 9.31 - 0.9031

pH ≈ 8.4069

Therefore, the pH of the buffer solution is approximately 8.41.

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The option that does not represent a characteristic of a pure substance is:

C) It is made up of different types of particles.

A pure substance is a material that consists of only one type of particle, either atoms of an element or molecules of a compound. It does not contain different types of particles. This is what distinguishes a pure substance from a mixture, which is composed of two or more different substances mixed together.

Option A states that a pure substance has a uniform texture throughout, which means it is homogeneous. This is true because pure substances have a consistent composition and properties throughout.

Option B states that a pure substance has a fixed boiling point or melting point. This is also true because pure substances have well-defined temperature ranges at which they transition between solid, liquid, and gas phases.

Option D states that a pure substance can be an element or a compound. This is true as well because pure substances can exist as either single elements or compounds consisting of two or more elements chemically bonded together.

In summary, the correct option is C, as a pure substance does not consist of different types of particles.

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The number of moles of  C6H18O3 that can be formed is 2 and 264grams of CO2 can be formed from C6H18O3.

Given the substance C6H18O3

Mass of C6H18O3 available (m) = 22.73decagrams = 227.3g

Molar mass of C6H18O3 (M) = 131.28g/mol

We know that number of moles is taken as = mass of substance/Molar mass of that substance

So, number if moles of C6H18O3 = 227.3/138.21 = 1.72

From the reaction: C6H18O3 + 9O2 → 6CO2 + 9H2O

We can see that for every 1 mole of C6H18O3 6 moles of CO2 is formed.

So the mass of CO2(carbon dioxide) used is calculated as:

mass = moles of CO2 x Molar mass of CO2

Molar mass of CO2 = 44g/mol

mass of CO2 = 6 x 44 = 264g

Hence the required mass of CO2 is 264g

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Answer:The mass of scheelite having one million oxygen atoms is. Explanation: We are given: Number of oxygen atoms = (million atoms). According to mole .

Explanation:

Answer Explanation:

Cane preparation (cutting and shredding cane to prepare it for juice extraction) Juice extraction (two technologies are in common use; milling or diffusion) Juice clarification (remove suspended solids from the juice, typically mud, waxes, fibres)

Answer:

B, the control group followers were a day older than the experimental group flowers

Explanation:

Took the test

There are 7.52 x 10^22 molecules of carbon dioxide gas, CO2, in 0.125 moles.

        The number of molecules in a given number of moles can be calculated using Avogadro’s number, which is approximately 6.022 x 10^23. This number represents the number of particles (atoms or molecules) in one mole of a substance.

         To calculate the number of molecules in 0.125 moles of CO2, we can multiply the number of moles by Avogadro’s number: 0.125 moles x (6.022 x 10^23 molecules/mole) = 7.52 x 10^22 molecules.

         Avogadro’s number is a fundamental constant in chemistry and is used in many calculations involving moles and molar mass.  

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Answer:

D

Explanation:

i mean it's just taking the words of the question and putting them into an equation

\(\huge\boxed{Option C}\)

As per Question,

It is saying that Benzene(organic compound) reacts with nitric acid. So,

Benzene and Nitric Acid are Reactants,

Nitrobenzene is the Product.

_________________________________________________________

General way of showing the reaction is,

In the following Question,

Benzene is Reactant no. 1,

Nitric Acid is Reactant no.2,

Nitrobenzene is Product no 1,

Water is a By Product.

Answer:

It would be 3.1063937724731447 moles.

Hope this helps :)

Answer:

the rock is dencer than the water and the stick has more surface tension.

Answer:

The rock is heaver so it sinks to the bottom of the lake, and the and the stick is lighter so it floats.

Hope this helps☺️

Answer: oh i thought i knew it nvm im sorry love

Explanation:

A, the total number of valence electron is 24 for Silicon Tetrachloride , SiCl₄ .

In Lewis Dot structure S=N-A is used to calculate the total number of shared and unshared electrons in a molecule.

S is the number of shared electrons ,N is the number of total valence shell electrons required by all the atom of the molecule, A is the total number of valence electrons available from all the atoms in the molecule

For SiCl₄,

• We have to first count the valence electron on each atom that is coming to form a molecule .

Valence electron on Si = 4

Valence Electron on Cl = 7

Total valence electron on SiCl₄ = 4+ 4 * 7 = 32

• Then we find the least electronegative atom in the molecule and place it at the center , In SiCl₄ , Si has 1.8 and Cl has 3.16 and so Si is placed at the center and four Cl atoms are connected with a single bond

• A single bond takes up 2 valence electron and so for four bonds 8 valence electrons have been occupied , so we are left with 32-8=24 valence electrons.

Therefore In the Lewis Dot structure S=N-A , Total number of valence electrons available from all the atoms in molecule of SiCl₄ is 24.

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The drying agent is removed from an organic solution through a method called solid-liquid separation, which is preferred for its efficiency and ease of use.

Steps for removal of dryoinhg agent :

Step 1: Add the drying agent to the liquid organic solution. The drying agent is a solid substance that has a high affinity for water or other impurities in the solution.

Step 2: Allow the drying agent to interact with the liquid solution for some time. This interaction allows the drying agent to absorb water or other impurities, thereby leaving the organic solution drier.

Step 3: Perform a solid-liquid separation process, such as filtration or decantation. Filtration involves passing the mixture through a filter paper or a porous medium, which traps the solid drying agent and allows the now-dry organic liquid to pass through. Decantation involves carefully pouring off the liquid while leaving the solid drying agent behind.

Step 4: Collect the purified organic solution and dispose of the solid drying agent.

This method of solid-liquid separation is preferred because it is straightforward, efficient, and allows for easy removal of the drying agent, resulting in a purified organic solution.

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Answer:

number of moles = mass / Mr

no. of mol. of hydrogen = 0.59/1 =0.59

no. of mol. of oxygen = 9.40/16 = 0.5875

divide both by smallest value which is 0.5875 which gives you 1 mole of oxygen & 1 mole of hydrogen

OH is the empirical formula but because the Mr is 34, we must multiply H by 2 and O by 2 and that’ll be H2O2 which is hydrogen peroxide

Explanation: hope this helps :)

The enthalpy change of displacement (ΔH) is the amount of heat released or absorbed when a metal reacts with an aqueous solution of an ion of another metal to form a solid compound.

The metal reactivity series, on the other hand, is a list of metals in order of decreasing reactivity, based on their tendency to lose electrons and form positive ions. While there is some correlation between the two, the enthalpy change of displacement is not directly correlated with the metal reactivity series. This is because the enthalpy change of displacement depends on several factors, such as the nature of the metal and the ion, the ionic charge, and the temperature and concentration of the solution. In general, metals that are more reactive have a greater tendency to form positive ions and release heat (exothermic reaction) during displacement reactions. However, other factors, such as the size and charge of the ion, can also play a role in determining the ΔH of a displacement reaction. So, while the metal reactivity series provides a useful guide to the relative reactivity of different metals, it is not a direct indicator of the enthalpy change of displacement for a given reaction.

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The number of valence electrons, core electrons, and unpaired electrons in the ground state varies for each element.

In the ground state, an atom's valence electrons are the electrons in its outermost energy level or shell. These electrons determine the atom's chemical properties and are involved in bonding. The number of valence electrons can be determined by looking at the group number of the element in the periodic table. For example, elements in Group 1 (such as hydrogen and lithium) have 1 valence electron, while elements in Group 2 (such as beryllium and magnesium) have 2 valence electrons.

Core electrons, on the other hand, are the electrons that occupy the inner energy levels or shells of an atom. These electrons are not involved in bonding and are generally more tightly bound to the nucleus. The number of core electrons can be calculated by subtracting the number of valence electrons from the total number of electrons in the atom.

Unpaired electrons are the electrons in an atom's valence shell that are not paired with another electron. These unpaired electrons play a significant role in determining the atom's reactivity and ability to form chemical bonds. The number of unpaired electrons can be determined by examining the electron configuration of the element.

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At a pH of 10, approximately 99% of the ammonium ion  will have reacted to form ammonia, leaving 1% of the ammonium ion unreacted.

When wastewater pH is 10, ammonium ions can combine with hydroxide ions (OH-) to generate ammonia  by the equilibrium reaction:

\(NH_4^+ + OH- NH_3 + H_2O\)

The equilibrium constant (K) determines the fraction of ammonium ions that did not react to generate ammonia. At pH 10, hydroxide ions outnumber ammonium ions, causing ammonia to form.

High hydroxide ion concentrations favour ammonia generation since the equilibrium constant equation for this reaction involves the concentration of products divided by the concentration of reactants. Thus, a considerable portion of ammonium ions would have formed ammonia.

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Plasma state of matter is mostly represented in the image

A state of matter is a way to describe the behavior of atoms and molecules in a substance and there are three common states of matter which is solids means relatively rigid, definite volume and shape and they vibrate in place but don't move around and plasma is the the when at the very temperature of stars atom loses their electron and the mixture of electron and nuclei that result` in plasma state of matter

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Answer:

No they are not identical.

Explanation:

They are not identical because there are many ranges of states that the electrons could have.

I hope it helps! Have a great day!

Muffin ^^

Answer:

No.

Explanation:

It could vary so it wouldn’t be identical.

I hope it helps! Have a great day!

bren~

Answer:

Boron : B :: Beryllium :​Be

Explanation:

Boron is an element found in group 13 of the periodic table. It has three electrons in its outermost shell hence a valency of 3.

Beryllium is an element in group two of the periodic table. It has a valency of two hence there are two electrons in its outermost shell.

Boron and beryllium are similar words. The symbol of boron is B while the symbol of beryllium is Be.

Answer: the plasma membrane, the cytoplasm, ribosomes, and genetic material.

hope this helped

Answer:

On average, agriculture accounts for 70 percent of global freshwater withdrawals. In the last 30 years, food production has increased by more than 100 percent. FAO estimates that about 60 percent more food will be needed by 2050 to meet the food requirements of a growing global population.

Explanation:

Because i learnt this before and i aced a test about it dont worry

Answer:

12 atoms of carbon

Explanation:

(6.023X10^23)/12 atoms of Carbon.

There are 0.42 moles of carbon atoms in 5g of carbon.

no. of moles = mass (g) ÷ molar mass (g/mol)

No. of moles = 5g ÷ 12g/mol

No. of moles = 0.42moles

Therefore, there are 0.42 moles of carbon atoms in 5g of carbon.

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Answer:i think its the nucleas

Explanation:

im not totally sure

The balanced reaction equation is;

\(2LiI + Pb(NO_{3} )_{2} --- > 2LiNO_{3} + PbI_{2}\) as we can see from the equation that is written here.

In the balancing of the reaction equation, we have to make sure that the number of the reacting atoms on the reactant and the product side are the same for each of the elements.

On both sides of the equation, tally the atoms of each element. First, balance the polyatomic ion or the most complicated molecule. One element at a time, balance the other atoms of the reactants and products. Make sure that every atom is now evenly distributed on both sides of the equation.

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Answer: right here

Explanation:

A compound is a substance made up of a definite proportion of two or more elements. A chemical formula tells us the number of atoms of each element in a compound. It contains the symbols of the atoms of the elements present in the compound as well as how many there are for each element in the form of subscripts.

To calculate the number of oxygen atoms in 52.06g of carbon dioxide, you will first need to determine the number of moles of carbon dioxide in the given mass, and then use the mole ratio between carbon dioxide and oxygen atoms to find the number of oxygen atoms.

Here's how to do it:

\text{moles of CO}_2=\frac{\text{mass of CO}_2}{\text{molar mass of CO}_2}

The molar mass of carbon dioxide (\text{CO}_2) is calculated by adding the atomic mass of carbon (12.01 g/mol) to two times the atomic mass of oxygen (2 x 16.00 g/mol) to get a molar mass of 44.01 g/mol.

Therefore,\text{moles of CO}_2=\frac{52.06\text{ g}}{44.01\text{ g/mol}}=1.182\text{ mol}

2. There are two oxygen atoms in each molecule of carbon dioxide, so for every 1 mole of \text{CO}_2 there are 2 moles of oxygen atoms.

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The maximum mass of  produced will be,  2.16 grams

What is molar mass ?

In chemistry, the molar mass of a chemical compound is defined as the mass of a sample of that compound divided by the amount of substance. This is the number of moles of that sample measured in moles. Molar mass is a mass property, not a molecular property of a substance. Molar mass is the average of many instances of a compound, which often differ in mass due to the presence of isotopes. Most commonly, molar mass is calculated from standard atomic masses, so it is a global average and a function of the relative isotopic abundances of constituent atoms on Earth. Molar mass is good for converting between the mass of a substance and the quantity of a bulk substance.

Mass of Methane = 0.962 g

Mass of  oxygen= 1.2 g

Molar mass of Methane= 16 g/mole

Molar mass of Oxygen = 32 g/mole

Molar mass of Water = 18 g/mole

First we have to calculate the moles of  and .

Now we have to calculate the limiting and excess reagent.

Moles of methane = 0.962 g/16 g/mole=0.060

Moles of oxygen = 1.2 g/32 g/mole=0.04

As, 1 moles of  CH₄ react with 2 mole of O₂

So, 0.06 moles of methane  react with 2 x 0.04 = 0.08 moles of oxygen

From this we conclude that, Oxygen is an excess reagent because the given moles are greater than the required moles and methane is a limiting reagent and it limits the formation of product.

Now we have to calculate the moles of .

As, 1 mole of  react to give 2 moles of

So, 0.06 moles  of methane  react to give 0.06 x 2 = 0.12  moles of

Therefore, the maximum mass of  produced will be, 2.16 grams.

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