4. A solid is 5 cm tall, 3 cm wide and 2 cm thick. It has a mass of 129 g. What is its density?

Answer:

Group 1 elements become more reactive as we move down the group. These atoms are larger because they have more shells. ... The force of attraction between the nucleus and the electron is less than for smaller atoms, and the outer electron is lost more easily.

Answer:

b because the another has the arrows equal and in chemistry is not that way

The orbital diagram which represents neon (atomic number = 10) is option B.

An orbital diagram is a visual representation of the electrons in an atom's electron orbitals. It shows the number of electrons in each orbital and the spin of each electron.

The orbital diagram of neon shows that the first energy level (n=1) is filled with 2 electrons in the 1s orbital, and the second energy level (n=2) is filled with 8 electrons in the 2s and 2p orbitals.

Therefore, the orbital diagram of neon is \(\rm 1s^2 2s^2 2p^6\). The correct answer is option B.

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Yes, the molarity in both the cases will be different if the indicator is changed from methyl orange to phenolphthalein or from phenolphthalein to methyl orange.

Since molarity is defined as the Molar concentration, also known as molarity, amount concentration, or substance concentration, is a unit used to describe the amount of a substance in a solution expressed as a percentage of the volume of the solution or it is the number of moles of solute divided by volume of solution in liters.

So on changing indicator, the number of moles changes as the molar mass is changing, so the molarity and other observations will get changed too and may increase or decrease.

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Answer

The percent composition of Fe = 26.73%

The percent composition of C = 22.99%

The percent composition of H = 4.34%

The percent composition of O = 45.94%

Explanation

Given:

The compound is Fe(C₂H₃O₂)₃

What to find:

The percent composition of each of the elements in Fe(C₂H₃O₂)₃

Step-by-step solution:

Step 1: Calculate the total of Fe(C₂H₃O₂)₃ using the atomic masses of each of the elements in the periodic table.

Atomic mass of: (H = 1.008, C = 12.01, O = 15.999, Fe = 55.845)

Total mass of Fe(C₂H₃O₂)₃ = Fe + 4(C) + 9(H) + 6(O)

Total mass of Fe(C₂H₃O₂)₃ = 55.845 + 4(12.01) + 9(1.008) + 6(15.999)

Total mass of Fe(C₂H₃O₂)₃ = 55.845 + 48.04 + 9.072 + 95.994

Total mass of Fe(C₂H₃O₂)₃ = 208.951

Step 2: Determine the percent composition of Fe in Fe(C₂H₃O₂)₃

Mass of Fe in Fe(C₂H₃O₂)₃ = 55.845

The percent composition of Fe = 26.73%

Step 3: Determine the percent composition of C in Fe(C₂H₃O₂)₃

Mass of C in Fe(C₂H₃O₂)₃ = 4(C) = 48.04

The percent composition of C = 22.99%

Step 4: Determine the percent composition of H in Fe(C₂H₃O₂)₃

Mass of H in Fe(C₂H₃O₂)₃ = 9(H) = 9.072

The percent composition of H = 4.34%

Step 5: Determine the percent composition of O in Fe(C₂H₃O₂)₃

Mass of O in Fe(C₂H₃O₂)₃ = 6(O) = 95.994

The percent composition of O = 45.94%

Methane is the unidentified gas since its molar mass is 16 g/mol.

When describing atomic masses and molecular masses, the Dalton (Da) or unified atomic mass unit (u) are two alternative units of mass that are frequently employed. It is known to be 1/12 the mass of a carbon-12 atom and is also referred to as "amu" in older.

We must be aware that a gas's molar mass directly relates to how long it takes to diffuse.

t1/t2 = √M1/M2

Let t1 equal the 1.50 minutes it takes for the combustible gas to disseminate. Let t2 equal the 4.73 minutes it takes for the bromine vapor to disperse.

M1 = the flammable gas's molar mass equals

160 g/mol is the molar mass of the bromine vapor, or M2.

replacing values.

1.50/4.73 = √M1/160

(1.50/4.73) ^2 = M1/160

0.1006 = M1/160

M1 = 0.1006 × 160

M1 = 16 g/mol

Methane is the gas in question.

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As you move from left to right across a row of the periodic table, the atomic number increases, meaning there are more protons in the nucleus of the atom.

Atomic number is the number of protons in the nucleus of an atom, which determines its chemical properties and place in the periodic table of elements. The atomic number is represented by the symbol Z and is the whole number located above an element's symbol in the periodic table.

Elements are arranged in order of increasing atomic number, and elements with the same atomic number belong to the same element, regardless of their mass number or number of neutrons.

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The reason why red is the only color seen after white light passes thrrough the filter is:

B. The color filter absorbs all colors except red light.

As we know, light is a form of energy and a type of electromagnetic radiation. In the case of this experiments the light that is being used is the visible light that is only one part of the electromagnetic spectrum.

Visible light contains all colors, and they differ in wavelengh.

In this case, we are told that the only color of light that passes through the filter is red, and as we know the light that is going into the filter contains all colors (the complete visible spectrum). Therefore we know that the filter absorbs all colors exept for red light.

The strand 1 of hydrocarbons is used to produce plastic, hence option D is correct.

Raw resources like natural gas, oil, or plants that have been processed into ethane and propane are used to make plastics. The subsequent "cracking" procedure uses heat to transform ethane and propane into ethylene and propylene. To produce various polymers, these components are mixed.

Propylene is a substance found in large quantities in petroleum. In order to speed up chemical processes, refiners combine heated propylene with a catalyst to create plastic. Propylene molecules start to cluster together like beads on a thread as a result.

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Answer:

Antoine Lavoisier

1) Law of Conservation of Mass

French chemist, Antoine Lavoisier in 1789, studied this law. This law states that “In all physical and chemical changes, the total mass of the reactants is equal to that of the products” or “Mass can neither be created nor destroyed.”

Answer:

all I can think of is gamma rays

The combinations of names and formulas of ions that is incorrect is NO2- nitrate.

An ion is an atom or molecule with a charge because it has a different amount of electrons than protons. Any atom or group of atoms with one or more positive or negative electrical charges is referred to as an ion. An ion is an electrically charged atom (or collection of atoms). It is generated when an atom loses or gains an electron. Ions are classified into two types: cations and anions. When a sodium atom loses one electron, a sodium ion (Na+) is created. A cation is a sodium ion.

Here,

NO2- nitrate is an erroneous combination of ion names and formulae.

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Answer:

\(k=2.45M^{-2}s^{-1}\)

Explanation:

Hello.

In this case, considering the given specific orders of reaction, we can write the rate law as:

\(r=k[A][B]^2\)

Thus, considering the concentrations of A and B to be 0.200 M and 0.350 M respectively and a rate of 0.060 M/s, the rate constant turns out:

\(k=\frac{r}{[A][B]^2}\\ \\k=\frac{0.060M/s}{(0.200M)(0.350M)^2} \\\\k=2.45M^{-2}s^{-1}\)

This is what we know as a third-order reaction since the specific orders both add to 3.

Best regards.

The percent by mass of the lithium in the compound is 18.78%. Option C

We know that the percentage has to do with the amount of the element that can be found in the compound. We can be able to obtain this when we  find the molar mass of the compound and then obtain the mass of the element in the compound.

Hence;

Molar mass of the compound = [2(7) + 12 + 3(16)]

= 14 + 12 + 48

= 74 g/mol

The we have the mass of the lithium in the compound as 14

Thus we then have;

Percent of lithium = 14/74 * 100/1

= 18.78%

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Answer:

"2.48 mole" of H₂ are formed. A further explanation is provided below.

Explanation:

The given values are:

Mole of Al,

= 3.22 mole

Mole of HBr,

= 4.96 mole

Now,

(a)

The number of mole of H₂ are:

⇒  \(\frac{Mole \ of \ H_2}{3} =\frac{Mole \ of HBr}{6}\)

or,

⇒  \(Mole \ of \ H_2=\frac{1}{2}\times Mole \ of \ HBr\)

⇒                      \(=\frac{1}{2}\times 4.96\)

⇒                      \(=2.48 \ mole\)

(b)

The limiting reactant is:

= \(HBr\)

(c)

The excess reactant is:

= \(Al\)

Answer:

subtract

Explanation:

To find the net force of two bodies going in opposite directions, we must subtract the forces this is because they are not additive forces.

Answer:

4

Explanation:

Applying,

pH = 14-pOH.................... Equation 1

But,

pOH = -log(OH⁻)

Where OH⁻ = Hydroxyl ion concentration of NaOH.

From the question,

Given: OH⁻ = (1×10⁻¹⁰) M

Substitute these values into equation 1

pH = 14-log((1×10⁻¹⁰)

pH = 14-10

pH = 4

Hence the pH of NaOH with a molarity of 1.0 x 10-10M = 4

The first quantum number, that is, the principal quantum number of a 1s² electrons is n= 1. Hence, option A is correct.

Quantum numbers of an electrons represents the allocation of electrons in each orbitals within an atom. There are four different quantum numbers namely, principal quantum number, azimuthal quantum number, magnetic quantum number and spin quantum number.

No two electrons in an orbital will have same set of these four quantum numbers. The principal quantum number corresponds to the main energy levels represented by the letter n.

n for 1s orbital is always 1. Similarly for a 3s orbital n is 3. Therefore, the principal quantum number of one electron in 1s is n=1.

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1. The amount of water produced by the reaction is 0.359 g.

2. The amount of water produced by the reaction is 0.219 g.

To calculate the number of moles of acid neutralized by the tablet, subtract the number of moles of acid neutralized in the titration from the initial solution's moles of acid. Understand and explain standardization in the context of acidic and basic solutions used as reagents in experiments.

1. The neutralization reaction,

HCl (aq) + NaOH (aq) → NaCl (aq) + H2O (l)

we have to calculate the number of moles of HCl that react,

moles of HCl = volume of HCl x concentration of HCl

= 7.98 mL x 2.50 mol/L / 1000 mL/L

= 0.01995 mol

Since NaOH is in excess,

As a result, the amount of water produced will be equal to the amount of HCl that reacts:

moles of water = moles of HCl = 0.01995 mol

we can use the molar mass of water (18.015 g/mol)

mass of water = moles of water x molar mass of water

= 0.01995 mol x 18.015 g/mol

= 0.359 g

2. The neutralization reaction between H2SO4 and NaOH is:

H2SO4 (aq) + 2 NaOH (aq) → Na2SO4 (aq) + 2 H2O (l)

we have to calculate the number of moles of H2SO4 that react,

moles of H2SO4 = volume of H2SO4 x concentration of H2SO4

= 2.43 mL x 2.50 mol/L / 1000 mL/L

= 0.00608 mol

Now, we have to calculate the number of moles of NaOH that react:

moles of NaOH = volume of NaOH x concentration of NaOH

= 2.51 mL x 3.00 mol/L / 1000 mL/L

= 0.00753 mol

we need to use the stoichiometry of the balanced equation,

moles of water = moles of H2SO4 x (2 moles of water / 1 mole of H2SO4)

= 0.00608 mol x 2

= 0.01216 mol

we can use the molar mass of water (18.015 g/mol)

mass of water = moles of water x molar mass of water

= 0.01216 mol x 18.015 g/mol

= 0.219 g

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We need a color key to determine the pH of a solution using pH indicator paper.

pH is the measure of the hydrogen ions concentration in a solution which means the measure of acidity or alkalinity of the solution.

Generally, the pH scale ranges from 0 to 14.

A solution having a pH less than 7 is said to be acidic whereas a solution having a pH more than 7 is considered basic or alkaline

A solution having a pH equal to 7 is said to be neutral

pH indicators are weak acids that are found as natural dyes and that change color to show how many H⁺ (H3O⁺) ions are present in a solution.

The substance you are analyzing has an acidic, basic, or neutral pH value, which is calculated from the negative logarithm of H⁺ concentration.

The paper form of pH indicators is typically dipped into solutions and then removed for comparison against a color/pH key. Usually, the liquid form of pH indicators is added directly to solutions.

Thus, a color key or pH key is needed to determine the pH of a solution using pH indicator paper.

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Answer:

color key

creating a color key

have known PH values

A

Explanation:

hope this helps its all the answers in one

Answer:

h20

Explanation:

The student's method for preparing pure crystals of copper sulfate contains errors and does not produce the desired outcome.

Use copper oxide instead of calcium carbonate: The student should add copper oxide (CuO) to the hydrochloric acid instead of calcium carbonate. Copper oxide reacts with hydrochloric acid to form copper chloride, which can then be converted to copper sulfate through a subsequent reaction with sulfuric acid.

Add sulfuric acid to the copper chloride solution: After the copper chloride solution is formed, the student should add sulfuric acid to it. This reaction between copper chloride and sulfuric acid will yield copper sulfate and hydrochloric acid. The student should ensure that the correct stoichiometric ratio is maintained to maximize the yield of copper sulfate crystals.

Crystal formation: The student should allow the solution to cool slowly after the reaction with sulfuric acid. This promotes the formation of larger, well-defined copper sulfate crystals.

Filtration and drying: Once the crystals have formed, the student should filter the solution to separate the solid crystals from the remaining liquid. The filtered crystals should then be thoroughly dried to remove any remaining water, resulting in pure copper sulfate crystals.

By following these improvements, the student can obtain pure crystals of copper sulfate.

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The volume of 5.50 moles of CO2 at STP is 120.02 liters.

To calculate the volume of 5.50 moles of CO2 at standard temperature and pressure (STP), we need to use the ideal gas law:

PV = nRT

where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature.

At STP, the pressure is 1 atmosphere (atm) and the temperature is 273.15 Kelvin (0 degrees Celsius). The gas constant is 0.08206 L•atm/mol•K.

So we can plug in the values and solve for V:

V = nRT/P = (5.50 mol)(0.08206 L•atm/mol•K)(273.15 K)/(1 atm) = 120.02 L

Therefore, the volume of 5.50 moles of CO2 at STP is 120.02 liters.

Standard temperature and pressure (STP) is a set of standard conditions used for measuring and comparing the properties of gases. STP is defined as a temperature of 273.15 Kelvin (0 degrees Celsius) and a pressure of 1 atmosphere (atm). These standard conditions allow scientists to compare the behavior of gases under the same set of conditions, making it easier to compare and contrast the properties of different gases.

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The number of moles is 123.2 moles

To find the volume of a substance from its number of moles, you will need to know its molar volume, which is the volume occupied by one mole of a substance. The molar volume can vary depending on the temperature and pressure, so you will need to specify these conditions.

The formula to calculate the volume of a substance from its number of moles is:

Volume = Number of moles x Molar volume

We know that;

1 mole occupies 22.4 L

5.5 moles occupies 5.5 moles  * 22.4 L/1 mole

= 123.2 moles

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Answer:

Sodium hydroxide

Calcium sulfate

Ammonium cyanide

Aluminum sulfate

Explanation:

Just did it

The correct name for given compound is , NaOH (sodium hydroxide) , \(CaSO_{4}\) (Calcium sulfate) , \(NH_{4} CN\) (ammonium cyanide) and Al2(SO4)3 (aluminum sulfate).

A chemical compound can be defined as a substance made up of numerous identical molecules bound together through chemical bonds and made up of atoms from different elements.

Sodium hydroxide is the kind of organic compound which chemical formula is NaOH.

The name of given compound is :

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Answer:

To find the molar mass of BeCo3, we need to find the atomic masses of each element and add them together in the correct ratio:

Be: 9.01 g/mol

Co: 58.93 g/mol

O: 16.00 g/mol (there are three oxygen atoms)

Molar mass of BeCo3 = (1 x Be atomic mass) + (1 x Co atomic mass) + (3 x O atomic mass)

Molar mass of BeCo3 = (1 x 9.01 g/mol) + (1 x 58.93 g/mol) + (3 x 16.00 g/mol)

Molar mass of BeCo3 = 9.01 g/mol + 58.93 g/mol + 48.00 g/mol

Molar mass of BeCo3 = 115.94 g/mol

Therefore, the molar mass of BeCo3 is 115.94 g/mol.

87.5 ml of Tween 20 is needed to prepare a 350 mL of a 25% Tween 20 (also called polysorbate 20) (v/v) solution in water via chemical lab methods.

By ethoxylating of Sorbian monolaurate in labs or in factories, a compound is formed that is a is a nonionic surfactant of the polysorbate type and is named as Polysorbate 20 or as we commonly call it as Tween 20.

Its other common commercial brand names can be stated as Kolliphor PS 20, Scattics, Alkest TW 20, Tween 20, and Kotilen-20 etc.

It can be employed as a detergent and emulsifier in a variety of home, academic, and pharmaceutical applications due to its stability and relative nontoxicity.

This Tween 20 is also used as a wetting agent in a wide range of flavored mouth drops and thus provides a spreading effect to the other ingredients present in it.

To prepare 350ml 25% Tween 20 v/v solution

25% is the volume of Tween 20 in the entire solution

Thus volume = 25% of 350

= 350 x (25/100)

= 87.5 ml

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While having experienced polar explorers at the Catlin Arctic Survey would have been beneficial in many ways, it would also have been important for them to work collaboratively with the rest of the team.

Advantages:

Experienced polar explorers would have had a wealth of knowledge and skills, such as how to travel over the ice, how to set up camp, and how to handle emergencies.

Experienced polar explorers would have been able to make informed decisions about the best routes to take and the most efficient ways to travel. This could have helped to save time and energy.

Disadvantages:

Experienced polar explorers may have been set in their ways and resistant to new ideas. This could have hindered the team's ability to adapt to changing circumstances and make the most of new opportunities.

Experienced polar explorers may have been overconfident and taken risks that the rest of the team was not comfortable with. This could have put everyone's safety at risk.

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Answer:

6.022×1023

Here, it has been asked how many eggs are in one mole of eggs. The eggs represent the unit which can be atom, ion or molecule. So by the definition of mole, 6.022×1023number of eggs are present in one mole of eggs.

In a boys hostel, 1206 eggs would represent 1206 moles of eggs, assuming an average molar mass of 50 grams/mol.

To determine the number of moles of eggs,  first know the molar mass of eggs or the average molar mass of the components in eggs.

Since the composition of eggs can vary, assume an average molar mass based on the most abundant components.

The molar mass of an egg can be estimated to be around 50 grams/mol. This estimate takes into account the approximate composition of eggs, which consists mainly of water, protein, fat, and other components.

Next, convert the mass of eggs to moles.  1 mole of a substance contains Avogadro's number of molecules or entities, which is approximately \(6.022 *10^23.\)

Let's calculate the number of moles of eggs:

Mass of eggs = 1206 eggs * 50 grams/egg

= 60300 grams

Moles of eggs = Mass of eggs / molar mass of eggs

= 60300 grams / 50 grams/mol

= 1206 moles

Therefore, 1206 eggs would represent approximately 1206 moles of eggs, assuming an average molar mass of 50 grams/mol.

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The maximum mass of water that could be produced by the chemical reaction is 162 g.

The given chemical equation is: 2 C8H18(l) + 25 O2(g) → 16 CO2(g) + 18 H2O(l)In the chemical reaction of liquid octane with gaseous oxygen, the products are gaseous carbon dioxide and gaseous water.According to the balanced chemical equation, 2 moles of C8H18 react with 25 moles of O2 to form 18 moles of H2O.So, 1 mole of C8H18 react with 25/2 = 12.5 moles of O2 to form 9 moles of H2O.The molar mass of C8H18 is 114 g/mol. So, the number of moles in 17 g of C8H18 is:17 g / 114 g/mol = 0.149 molThe molar mass of O2 is 32 g/mol. So, the number of moles in 112 g of O2 is:112 g / 32 g/mol = 3.5 molFrom the balanced chemical equation, 1 mole of C8H18 react with 12.5 moles of O2 to form 9 moles of H2O.So, the number of moles of O2 required to react with 0.149 mol of C8H18 to form H2O is:(12.5 mol / 1 mol) × (0.149 mol / 2 mol) = 0.935 molThe maximum number of moles of H2O that can be produced from 0.149 mol of C8H18 and 0.935 mol of O2 is 9 mol.So, the mass of water produced from 17 g of C8H18 and 112 g of O2 is:9 mol × 18 g/mol = 162 g

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The appropriate items to their respective bins are:

Covalent: Carbon dioxide

Ionic: Table salt

Metallic: Iron

Molecular: Sugar

What is bins?

Bins are containers used for storing and organizing items. They can be made from a variety of materials, including wood, metal, and plastic, and come in many shapes and sizes. Bins are often used in large warehouses, retail stores, and other business establishments to store and organize products, tools, and other items. In the home, bins can be used to store toys, shoes, and other items that need to be kept organized.

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