Use this equation for the next question.
Mg(OH)2 + NaCl ® MgCl₂ + NaOH
How many hydrogen atoms are on the reactant side?
000
1
02
4
8

When the kinetic energy of an object changes, the motion of that object also changes at the same time.

The amount of energy that a body posses by virtue of its motion is known as Kinetic energy. Therefore, kinetic energy can only be found in objects which are in motion. The amount of Kinetic energy is calculated as follows:

K = 1 /2 mv²

Where, K represents the kinetic energy, m is the mass of the moving object, and v is the velocity or the speed of the object at which it is moving.

If the kinetic energy of the body increases then the motion of the body also increases and if the kinetic energy decreases then the velocity also decreases.

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Answer:

3.32%

Explanation:

To calculate the percent error, you need to use the following equation:

                             | measured value - actual value  |
Percent Error  =  --------------------------------------------------  x  100%
                                              actual value

In this equation, the measured value is the amount generated after running an experiment. The actual value is the amount generated solely through calculations.

Measured Value = 233 mL

Actual Value = 241 mL

                             |  233 mL - 241 mL  |
Percent Error  =  --------------------------------  x 100%
                                        241 mL

                                 8 mL
Percent Error  =  -----------------  x  100%
                                241 mL

Percent Error  =  0.0332  x  100%  =  3.32%

Nucleus 2: ¹⁸₈F

Nucleus 4: ¹⁹₈F

(Isotopic notation are similar as nuclear notation, or the atomic mass, symbol, and atomic number.)

The picture shows the balancing of chemical equations. The balanced chemical equation of the reaction is:

Balanced chemical equations are equations in which the number of moles of atoms of elements that are reacting is equal to the number of moles of atoms of the elements that are produced.

The balancing of chemical reactions follows the law of conservation of mass which states that matter cannot be created nor destroyed but can change from one form to another.

Hence, in a balanced chemical equation, the mass of the reactants is equal to the sum of the mass of the products.

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Answer:

All forms of hydroxides

Explanation:

The metals in Group IA (Li, Na, K, Rb, Cs, and Fr) are called alkali metals because they all form hydroxides (such as NaOH) that were once known as alkalies. The electron configurations of the alkali metals are characterized by a single valence electron.

Move the decimal so there is a non-zero digit to the left of the decimal point. The number of decimals you move will be the exhibitor on the 1010. If the decimal has been moved to the right, the exponent will be negative. If the decimal has been moved to the left, the exponent will be positive.

[tex]1.8 \times 10 { }^{1} [/tex]

The number of moles of argon gas in a 4L container at 1620KPa and 25C is 2.62 moles. This can be calculated by ideal gas equation. The number of moles will not change when the argon gas is replaced by helium gas.

What is an ideal gas equation?

The ideal gas equation states the relation between pressure, volume, number of moles and temperature. The pressure multiplied by volume is directly proportional to the number of moles multiplied to the temperature. The equation can be written as, PV = nRT.

According to the ideal gas equation,

PV = nRT

P is pressure, n is number of moles, T is temperature, V is volume.

n = 1620KPa x 4L / 8.314Jmol^-1K^-1 x 298K = 2.62 moles.

Therefore, according to ideal gas equation, 2.62 moles is the number of moles of the gas in 4L container with 1620KPa pressure and 25C temperature. The number of moles doesn't depend on the gas. So it doesn't change when argon gas is replaced with helium gas.

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Based o the nature of the reactants and products:

A chemical reaction is a reaction that results in changes in the chemical properties of substances.

A chemical reaction results in the formation of new products.

There are several types of chemical reactions such as:

This is illustrated as follows: AB + C ---> AC + B

This is illustrated as follows: AB + CD ---> AC + BD

Hence, two ionic compounds react to produce two iob=nic compounds.

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Explanation:

for reactions to occur, the reactants must've reach a certain amount of energy for collisions to occur. hence, if a reaction has a lower activation energy, this energy can be reached sooner therefore, reaction would occur faster.

The pH of 10 g dm -3 HCL​ is 3. The pH scale determines how acidic or basic water is. The range is 0 to 14, with 7 representing neutrality.

Acidity is indicated by pH values below 7, whereas baseness is shown by pH values above 7. In reality, pH is a measurement of the proportion of free hydrogen and hydroxyl ions in water.

Hydrogen potentials are what PH stands for. It speaks of how many hydrogen ions are present in a solution. This serves as a gauge for the acidity or alkalinity of a solution. On a pH scale, the pH value ranges from 0 to 14.

A solution's pH is a significant indicator of its chemical composition. The pH may affect how readily available nutrients are, how biological processes work, how bacteria behave, and how chemicals behave.

[ H⁺ ] = 10 − 3 M,

pH = − log [ 10 − 3 ],

pH = 3.

Thus, The pH of 10 g dm -3 HCL​ is 3.

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Answer:

I'm not entirely sure about questions 3-5, but I am going to assume you want the products.

3.  [tex]Al + O_{2} = AlO_{2}[/tex]

4. [tex]2 Mg + Zn(NO_{3})_{2} = 2 Mg(NO_{3}) + Zn[/tex]

5. [tex]BaCl_{2} + Na_{2}SO_{4} = BaSO_{4} + 2 NaCl[/tex]

As for questions 6-8, it is quite simple,

6. Synthesis Reaction

7. Single Displacement Reaction or another name is Substitution Reaction

8. Decomposition Reaction

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The concentration of acetic acid in the solution is 0.257 M.

The concentration of acetic acid in the solution is determined from the Henderson- Hasselbalch equation as follows:

where;

pKa = - log(1.7 * 10⁻⁵)

pKa = 4.77

Equation of reaction: HC₂H₃O₂ (aq) + H₂O(l) --> C₂H₃O₂⁻ (aq) + H₃O⁺ (aq)

From the equation of reaction; [A⁻] = [H₃O⁺]

[H₃O⁺] =  antilog -(pH)

[H₃O⁺] = antilog (-2.68)

[H₃O⁺] = 0.002

[A⁻] = 0.002

[HA] = [A⁻] / antilog of (pH - pKa)

[HA] = [A⁻]  / antilog (2.68 - 4.77)

[HA] = 0.002 / 0.00812

[HA] = 0.257 M

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Answer:

Explanation:

[He]2s²2p⁶

The term chemical weathering is said to occur when water reacts with carbon dioxide to produce carbonic acid, weakening the rock.

The term weathering has to do with the breaking down of the rock. Now we know that rocks are defined as the solid part of the earth's crust. We can find the rocks either at the surface or under the earth.

The process of the breakdown of the rocks can be initiated by many processes and one of the processes is by the break down of  the rock by the hydrolysis of the minerals that can be found in the rock. This owes to the formation of acid in the rocks.

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It will take 24 days for 100 atoms of radium-223 to decay with only 25 atoms of radium-223 left

Half-life is the time required for a quantity to a radioactive substance reduce to half of its initial value. The term is often used in nuclear physics to describe how quickly an unstable atom radioactively decays or how long a stable atom survives. The term can also be used to characterize any type of exponential decay.

Given,

Half life of radium-223 = 12 days

If 100 atoms decay leaving 25 this means = 3/4 decay

Aₓ = A₀ × [tex](\frac{1}{2}) ^{\frac{t}{t_{1/2} } }[/tex]

Where, Aₓ = the amount left after t years

A₀ = the initial quantity of the substance that has to be decayed

[tex]t_{1/2}[/tex] = the half-life of the decay

So, for 3/4 decay:

A₀ × 1/4 =  A₀ × [tex](\frac{1}{2}) ^{\frac{t}{t_{1/2} } }[/tex]

1/4 =  [tex](\frac{1}{2}) ^{\frac{t}{t_{1/2} } }[/tex]

[tex](\frac{1}{2} )^{2}[/tex] =   [tex](\frac{1}{2}) ^{\frac{t}{t_{1/2} } }[/tex]

[tex]\frac{t}{t_{1/2} }[/tex] = 2

Since, Half life of radium-223 = 12 days

then,

t/12 = 2

t = 12 × 2

t = 24 days

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DART sent images from a camera to record its progress. The collision and the results of the collision were recorded by the International Space Station.

DART stands for Double Asteroid Redirection Test. The investigative team of the (DART) mission indicates that the spacecraft's kinetic contact with its target asteroid, Dimorphos, successfully changed the asteroid's orbit.

Asteroid is a small planet in our Solar System. Asteroids range in size and shape from 1-meter boulders to a dwarf planet almost 1000 kilometers in diameter; they are stony, metallic, or ice worlds with no atmosphere.

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Answer:

Covalent bonds usually occur between nonmetals.

Explanation:

The approximate degree of dissociation is 4.45%.

Degree of dissociation:

The degree of dissociation is the phenomenon of generating current-carrying free ions, which are dissociated from the fraction of solute at a given concentration.

The degree of dissociation is another way of determining the strength of a base. It indicates the fatty acids that were released from a base when it dissociates in water.

The formula for degree of dissociation:

α λ λ α λ λ α = λ c λ 0

where λ λ λ c is the molar conductivity of weak electrolyte at “C” (concentration)

λ λ λ 0 is the molar conductivity of weak electrolyte at "0".

Ka = C∝²

∝ = [tex]\sqrt{\frac{Ka}{C} }[/tex]

Ka = [tex]10^{-3.08}[/tex] = 8.32×[tex]10^{-4}[/tex]

C = 0.42

Putting these values in the equation we have:

∝ = [tex]\sqrt{\frac{8.32 * 10^{-4} }{0.42} }[/tex]

   = 4.449 ×[tex]10^{-2}[/tex]

   = 0.04449

The degree of dissociation is 4.45%

Therefore the degree of dissociation is 4.45%.

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Answer:

(0,1)

Explanation:

Endpoints (-3, 7) and (3,-5)

The midpoints will be the average of the x and y coordinates:

Midpoint for x = (-3+3)/2 = 0

Midpoint for y = (7-5)/2 = 1

(0,1)

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Answer:vaporization

Explanation:

The empirical formula of a compound that contains 60% titanium and 40% oxygen by mass is TiO₂.

Empirical formula is a notation indicating the ratios of the various elements present in a compound, without regard to the actual numbers.

The empirical formula of a substance can be calculated as follows:

Next, we divide each mole value by the smallest as follows:

The empirical ratio of Titanium and oxygen is 1:2, hence, the empirical formula is TiO₂.

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When 0.018 mol of tripalmitin is hydrolyzed, the theoretical yield of palmitic acid will be 0.054 moles.

The hydrolysis of tripalmitin with NaOH is saponification where a glycerol compound and fatty acids are released. Thus the fatty acids combined with the Na ion further react with the acid HCl forming a salt. Tripalmitin is a triglyceride obtained from 3 hydroxy groups of glycerol by palmitic acid (hexadecanoic). Thus, this hydrolysis yield carboxylate salt and alcohol called a saponification reaction.

Hydrolysis of 1 tripalmitin releases 3 fatty acids hence, for 0.018 moles, palmitic acid yielded is,

= 0.018 × 3

= 0.054 moles.

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Both models are useful to describe the reactvity of potassium because each shows an electron in the outermost shell.

Valence electrons can be described as the s and p electrons in the outermost shell while the electrons present in the inner shell are called core electrons.

Valence electrons can be all arranged in different shells and are negatively charged particles. These electrons are responsible for chemical interaction between atoms and the formation of chemical bonds.

Only the electrons present in the outermost shell can contribute in the formation of a chemical bond and decide the reactvity of atom such type of electrons is called valence electrons.

The reactivity in potassium can be seen due to one electron present in the valence shell.

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The melting point of a solution that is formed when 130 g of ethylene glycol (C2H6O2) dissolved in 1.00 kg of water is -6.518C.

What is melting point?

Melting point is the temperature at which substance changes state from solid to liquid. Different solids have different melting points. This depends on the pressure which is usually taken as standard pressure that is 1 atmosphere or 100kPa.

The melting point for the given solution can be calculated as,

Number moles of ethylene glycol is calculated as,

n = m / M = 130 g / 62 gmol^-1 = 2.096 mol.

m is mass, M is molecular mass.

Then the molality of the solution is calculated,

Molality = n / mass of solvent in Kg = 2.096 mol / 1 kg = 2.096 mol/kg

The Kf of ethylene glycol = -3.11

Melting point = Kf x molality = -3.11 x 2.096 = -6.518C.

Therefore, the melting point of a solution that is formed when 130 g of ethylene glycol (C2H6O2) dissolved in 1.00 kg of water is -6.518C.

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According to stoichiometry and balanced chemical equation 10 iron atoms  react with 30 molecules of chlorine.

Stoichiometry is the determination of proportions of elements or compounds in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.

Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample.It is important in balancing chemical equations.It is useful in chemical calculations while making solutions of different concentrations.

Two atoms of iron reacts with 6 molecules of chlorine , so  for 30 molecules of chlorine it is, 30×2/6=10 atoms of iron.

Thus, 10 atoms of iron will react with 30 molecules of chlorine.

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The molarity of the solution is 66.207 M.

1) number of moles of Na2SO4

number of moles = mass/molar mass = 534/142 = 3.7605633 moles

To precipitate 3.7605633 moles of Na2SO4 we need the same amount of moles of BaCl2 = 3.7605633 moles.

2) molarity of BaCl2 solution

concentration = number of moles/volume =  3.7605633/0.0568

= 66.20710 M

Molarity is defined as the total number of moles of solute in one kilogram of solvent. Molarity is also called molarity.

The symbol for molarity is a capital M. In chemistry, a solution is a mixture of two or more substances in which none of the substances are chemically changed. The formula for calculating molarity is the ratio of the moles of solute for which the molarity is calculated and the volume of solvent used to dissolve the particular solute.

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The overall dipole moment of the water molecule is shown in the image attached.

We know that there is a dipole that exists in a molecule when there is an electronegativity difference between the atoms that are in the molecule. In the case of the water molecule, there is an electronegativity difference that exists between the atoms of the water molecule.

Now, hydrogen is the positive end of the dipole and the oxygen is the negative end of the dipole. We have seen the structures of the dipole moment. Now, the overall dipole moment of the water molecule is shown in the image attached.

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At room temperature 15 grams of zinc will occupy 2.10 cm3

What is density of an element?

When atoms occupy a specific volume of space, their mass and number are measured by the periodic table's element densities. The quantity of mass in a particular volume, commonly expressed as grams per cm3 or g/cm3, is the density, which is a measurement of the number of particles in a certain volume of a substance.

Given the mass of zinc is 15 grams.

The density of zinc in room temperature is 7.14 g/cm^3

Density = mass/ volume

Volume =  mass / density

Volume = 15/ 7.14 = 2.10 cm3

Hence, at room temperature 15 grams of zinc will occupy 2.10 cm3.

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If the relative molecular mass of CH₂O is 60, the molecular formula of the compound would be  [tex]C_3 H_6O_3[/tex].

The empirical formula of a compound is the formula based on the simplest whole number ratio of the component atoms. The molecular formula could be in multiples of the empirical formula.

The empirical and the molecular formulas of a compound are related by the following equation:

[empirical formula]n = molecular formula

Where n = molecular formula mass/empirical formula mass

In this case, the relative molecular mass is 60. The empirical formula mass can be calculated as:

CH₂O = (12) + (2x1) + (16)

          = 40 g/mol

Thus:

n = 60/40

 = 1.5

Therefore, the molecular formula would be: [CH₂O]1.5 which is equivalent to [tex]C_3 H_6O_3[/tex]. This is because atoms combine in simple whole number ratios.

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