Which row gives the correct order of reactivity of the four metals?
(look at the attached photo)

Answer:-8

Explanation:

edmentum

The solution for the given linear equation can be solved by simplifying the equation. The value of x is obtained as - 8.

Linear equations are the equations which shows a linearity with a second expression which is similar to the first but having different mathematical operations and signs.

By solving linear equations we can solve for the unknown value of x. The value of x can be obtained by taking the whole expression to one side and which is having a constant value.

Given, - 3x + 7x - 8 = 34 + 9x -2.

          = 4x - 8 = 32 + 9x

          = 4x - 8 - 9x = 32

             -5x = 40

              x = - 40/5 = - 8.

Hence, solution of the given equation is  -8.

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The combination of the number of particles produced and the size and shape of the molecules contributes to the greater freezing point depression caused by 1 mol of NaCl compared to 1 mol of glycerin in 1 kg of water.

The amount of freezing point depression caused by a solute is directly proportional to the number of particles it produces when dissolved in a solvent. In other words, the more particles a solute produces, the greater the effect on the freezing point of the solvent.
When 1 mol of sodium chloride (NaCl) is dissolved in water, it produces two particles - one Na+ ion and one Cl- ion. On the other hand, 1 mol of glycerin (C3H8O3) only produces one particle. This means that NaCl is a more effective depressant of the freezing point of water than glycerin because it produces more particles when dissolved in water.
Additionally, the size and shape of the molecules can also play a role in the extent of freezing point depression. Glycerin is a relatively large and complex molecule, while NaCl is a simple ionic compound. The large size and complexity of glycerin molecules may make it less efficient at interacting with water molecules and causing freezing point depression compared to the small and simple ions produced by NaCl.
Therefore, the combination of the number of particles produced and the size and shape of the molecules contributes to the greater freezing point depression caused by 1 mol of NaCl compared to 1 mol of glycerin in 1 kg of water.

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Answer:

it's D

Explanation:

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Visible light and radio waves are both forms of electromagnetic radiation, which has a dual nature and can exhibit properties of both particles (photons) and waves.

The wave nature of electromagnetic radiation is characterized by its wavelength and frequency, which are related by the speed of light (c = λν). Visible light having a shorter wavelength and higher frequency than radio waves, which have longer wavelengths as well as lower frequencies.

The particle nature of electromagnetic radiation is characterized by photons, which are discrete packets of energy that behave like particles. The energy of a photon is directly proportional to its frequency (E = hν), where h is Planck's constant. When electromagnetic radiation interacts with matter, it can transfer its energy to electrons in the material, causing them to be excited to higher energy levels or even ionized (knocked out of the material).

In summary, electromagnetic radiation, including visible light and radio waves, has both wave-like and particle-like properties, depending on the way it is observed and the context in which it is being studied.

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--The given question is incomplete, the complete question is

"Visible light and radio waves are both example of _____ radiation, which has a dual nature, possessing the properties of both ______ and waves."--

To create a polyester via condensation polymerization, several chemicals are required. These include a dicarboxylic acid, a diol, and a catalyst.

Dicarboxylic acid is an organic compound that contains two carboxylic acid groups, while a diol is a compound containing two hydroxyl groups. Both of these compounds are necessary to form the ester bond that creates polyester.

Additionally, a catalyst is required to facilitate the reaction between the dicarboxylic acid and diol. Other compounds such as an amine, a diamine, an alcohol, and a carboxylic acid may also be used, but they are not necessary for the reaction to occur.

Overall, the condensation polymerization process requires the combination of at least two compounds containing reactive groups, which form a polymer through a reaction that releases a small molecule such as water.

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1.5  x10⁻⁵m  is the wavelength of the infrared radiation produced from a stove, where the frequency is equal to  2.00 x 10¹³ cycles per second.

The distance among identical spots between two succeeding waves is known as the wavelength, which is a feature of waves. The wavelength of a wave is the distance from one wave's peak (or trough) and the next. In mathematics, the Greek symbol lambda () is used to denote wavelength.

The colour of light is determined by its wavelength, and the pitch of sound is determined by its wavelength. The visible spectrum ranges in wavelength from around 700 nanometers (red) to 400 nanometers (violet).

frequency × wavelength = speed of light

2.00 x 10¹³× wavelength = 3×10⁸

wavelength = 3×10⁸/ 2.00 x 10¹³

                  = 1.5  x10⁻⁵m

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Answer:

The chemical reaction between 2A group elements and 7A group elements is vigourous and a strong ionic bond is formed.

Explanation:

Calcium flouride has a high melting and boiling point because the chemical reaction between 2A group elements and 7A group elements is vigourous and a strong ionic bond is formed . To break these ionic bonds we require a lot of energy that is the reason why the calcium flouride has high melting and boiling point.

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Answer:

3.01 × 10²³ atoms Ne

General Formulas and Concepts:

Atomic Structure

Stoichiometry

Explanation:

Step 1: Define

Identify

[Given] 10.1 g Ne

[Solve] atoms Ne

Step 2: Identify Conversions

Avogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.

[PT] Molar Mass of Ne: 20.18 g/mol\

Step 3: Convert

Step 4: Check

Follow sig fig rules and round. We are given 3 sig figs.

3.01398 × 10²³ atoms Ne ≈ 3.01 × 10²³ atoms Ne

At 750 K and 2.50 atm, a sample of carbon dioxide takes up 4.50 liters. the volume of the gas at STP is approximately 4.16 L. So, the closest is (A) 4.1 L.

To determine the volume of the gas at STP (Standard Temperature and Pressure), we can use the ideal gas law equation:

PV = nRT

Where:

P = Pressure

V = Volume

n = Number of moles

R = Ideal gas constant

T = Temperature

First, we need to calculate the number of moles of carbon dioxide using the given conditions. The equation for the ideal gas law can be rearranged to solve for the number of moles:

\(n = \frac{{PV}}{{RT}}\)

Substituting the values:

P = 2.50 atm

V = 4.50 L

T = 750 K

R = 0.0821 L·atm/(mol·K) (ideal gas constant)

\(n = \frac{{2.50 \, \text{atm} \times 4.50 \, \text{L}}}{{0.0821 \, \text{L} \cdot \text{atm/(mol} \cdot \text{K)} \times 750 \, \text{K}}}\)

Calculating n:

n ≈ 0.192 mol

Now, we can use the number of moles to find the volume of the gas at STP. At STP, the temperature is 273.15 K, and the pressure is 1 atm.

Using the equation PV = nRT:

\(V_{\text{STP}} = \frac{{n \cdot R \cdot T_{\text{STP}}}}{{P_{\text{STP}}}}\)

Substituting the values:

n = 0.192 mol

R = 0.0821 L·atm/(mol·K)

T(STP) = 273.15 K

P(STP) = 1 atm

\(V_{\text{STP}} = \frac{{(0.192 \, \text{mol}) \cdot (0.0821 \, \text{L} \cdot \text{atm}/(\text{mol} \cdot \text{K})) \cdot (273.15 \, \text{K})}}{{1 \, \text{atm}}}\)

Calculating V(STP):

V(STP) ≈ 4.16 L

Therefore, the volume of the gas at STP is approximately 4.16 L. The closest answer choice is A. 4.1 L.

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CaCl₂ 2H₂O  contains the greatest percent of water by mass  By halving the hydrate's formula , one may compute the theoretical (real) percent hydration.

To provide with enough liquid or moisture; to make to occupy or mix with water or indeed the constituents of water. softens and moisturizes the skin. the intransitive verb "to hydrate"

Milk is one of finest liquids for hydration, according to research, even more than water or caloric beverages. Researchers attribute milk's efficiency to its protein, carbs, and natural electrolytes.

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Answer: simple and complex.

Explanation:These are also called simple sugars. They're found in refined sugars, like the white sugar you see in a sugar bowl. If you have a lollipop, you're eating simple carbs.

Answer:

number of protons in a nucleus

Explanation:

number of protons in a nucleus.  The number of protons in the nucleus is, by definition, the atomic number.

Correct option:

The statement "America is the world’s number one producer of natural gas derived from shale oil" is True.

Shale gas:

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Answer:

Action given and reaction taken

Also known as

Newton's third law of motion

Explanation:

An action will be done such as bouncing a ball on the wall

- You throw the ball (Action)

- The ball bounces back (Reaction)

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The melting point of 9,10-dihydroanthracene-9,10-succinic acid anhydride is 179-181°C.

A 9,10-Dihydroanthracene-9,10-succinic acid anhydride is a reagent used in the synthesis of polycyclic aromatic hydrocarbons (PAHs). It is used to oxidize a variety of ketones and aldehydes to the corresponding carboxylic acids or esters, as well as to reduce other compounds. The crystal structure of this reagent has been studied using single-crystal X-ray diffraction at 300 K by Hu and coworkers.

The temperature at which a substance melts is known as its melting point. In general, substances that are purer have higher melting points than those that are less pure. Melting point determination can be used to help identify and/or characterize a substance by comparing its melting point to a known standard value. Additionally, it can be used to determine the purity of a substance.

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Answer:

20.02 Liters

Explanation:

Mass = 35g

Volume = ?

Temperature = 301K

Pressure = 1.35 atm

The relationship between the quantities is given as;

PV =  nRT

n = mass / Molar mass = 35 / 32 = 1.09375 mol

V = nRT / P

V = (1.09375 * 0.0821 * 301) / 1.35

V = 20.02 L

The molecule ammonium lauryl sulfate is a detergent because of its hydrophobic tail and a hydrophilic head which are responsible for its cleansing action.

Though not shown, I presume that the property labelled as C must have to do with the cleasing action of the molecule ammonium lauryl sulfate.

The substance has a hydrophobic tail and a hydrophilic head which enables it to form miscles and these are the responsible for the cleansing action of the ammonium lauryl sulfate molecule.

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Answer:

It depends on the atom, or more specifically, on the size of its nucleus. There is a competition between the electrical repulsion of the protons (that drives the nucleus apart) and the attraction of the protons and neutrons (due to chromodynamics). For nuclei above a certain size, the repulsion tends to win

Explanation:

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Answer:

Explanation:The atomic number is just a part of the atomic mass the atomic number is like the number of protons in the nucleus of an atom while the atomic mass is the sum of the number of protons and the number of neutrons within the nucleus.

Atoms are smallest particle of any entity; Atoms consist of three fundamental types of particles, protons, electrons and neutrons. Option C & D are the correct statement.

Define an atom?

Atoms are the smallest particle of an element. Atoms cannot be broken into sub parts. It consisting of 3 particles like, protons, electrons and neutrons.

Atoms of the all substance do not have same chemical properties. Because, atoms have different number of proton and electrons. Atoms cannot be destroyed by heating or cooling. Smallest unit atoms have elemental chemical identity and atoms can combine to make all the substance on earth.

Therefore, statement C and D are correct.

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The statement that correctly describes atoms are:

c. Atoms are the smallest unit of an element that has the chemical identity of that element.

d. Atoms combine to make all the substances on Earth.

The tiniest component of an element is called an atom. Atoms are not divisible into smaller components. It is made up of three different particles: protons, electrons, and neutrons.

All atoms do not share the same chemical characteristics. Because the quantity of protons and electrons in each atom varies. No amount of heat or cold can kill an atom.

Therefore, the correct option is c and d.

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When looking to change the value of the autoionization constant of water, the temperature of the water should be changed. The correct answer is option a.

The autoionization constant is also known as the self-ionization constant. It is a constant used to express the extent of an aqueous substance's autoionization. It measures the propensity of a chemical substance to autoionize. Kw (autoionization constant of water) is the product of the concentration of the hydrogen ion, [H+], and the concentration of the hydroxide ion, [OH-], at equilibrium.

It is frequently expressed as follows: Kw = [H+][OH-]. Kw has a value of 1.0 × 10-14 at 25 °C since pure water at 25 °C has a pH of 7. The pH of pure water changes if the temperature of the water changes. When looking to change the value of the autoionization constant of water, the temperature of the water should be changed. The autoionization constant of water varies with temperature.

As a result, if the temperature of water is changed, the autoionization constant Kw will also change. It can also affect the pH of water since the concentration of hydronium ion is related to the pH of the water.

Therefore, the correct answer is option a.

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Answer:

Molybdenum is M, Einsteinium is E, and N is Nitrogen. Lastly, S is sulfur.

Answer:

NaOH

Explanation:

the balance equation is HBr +NaOH----> NaBr+ H2O. The salt formed is NaBr, sodium,Bromide

Answer:

Aluminium is ordinarily classified as a metal. It is lustrous, malleable and ductile, and has high electrical and thermal conductivity. Like most metals, it has a close-packed crystalline structure and forms a cation in an aqueous solution.

Answer: 1) True

2) False 4)False 5)True

Explanation: I took a test that had similar questions

Answer:

13

Explanation:

proton plus neutron equal to atomic mass

Answer:

Thus, the Earth's gravitational field (near ground level) can be quoted as 9.8 metres per second squared, or the equivalent 9.8 N/kg. Acceleration can be measured in ratios to gravity, such as g-force, and peak ground acceleration in earthquakes.

Explanation: