Each of the following pairs of elements will react to form an ionic compound. Write the formulas and name these compounds: (a) barium and oxygen, (b) calcium and phosphorus, (c) aluminum and sulfur, (d) lithium and nitrogen

Now, write an equilibrium expression, Ka = [H +][CN -]/[HCN]. Ka = 4.9E-10 = x 2/(0.0620-x). Since the power of the Ka is -10, we can safely assume that the x is small enough to ignore compared to the 0.0620, so it becomes 4.9E-10=x 2/0.0620.

Aqueous solutions are ones in which water serves as the solvent. It is commonly represented in chemical equations by adding (aq) to the relevant chemical formula. For instance, Na+(aq) + Cl could be used to represent a solution of table salt (also known as sodium chloride, or NaCl) in water (aq).

The Latin word aqua is the source of the phrase aquatic, which means to be or to consist of water. Water is a common solvent in chemistry since it functions well as a solvent and is also easily accessible. Since water is usually used as the solvent in experiments, unless otherwise mentioned, the word "solution" frequently refers to an aqueous solution.

A solution where the solvent is a liquid is referred to as a "non-aqueous solution."

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The statement that shows an example that demonstrates the reversibility of a chemical change is rotting of eggs (option B).

A chemical change is any process in which reactants are changed into products by the breaking or creation of chemical bonds.

Chemical changes are opposed to physical change, which only affects the form of a chemical substance, but not its chemical composition.

Examples of chemical changes are as follows:

Therefore, it can be said that rotting process of an egg is an example of a reversible chemical change.

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Answer:

Recharging batteries.

I just took the quick check

Explanation:

If your here for the Physical vs. Chemical Change Quick check for Connexus, here are the answers.

1- Dry ice becoming vapor

2-iron (Fe) reacting to water((H2O)) and oxygen(O) to form iron oxide(Fe2O3)

3-conduct a test to determine the chemical makeup of the molecules

4-Atoms of one or more substances rearrange into a new substance.

5-recharging batteries

I took the quick check, and these were the answers!!

                        Hope this helps someone!

108.81 grams of phosphorus are present in 3.51 moles of phosphorus trichloride PCl3. The molecular formula of Phosphorus trichloride is PCl3.

How many moles of phosphorus trichloride in 1 gram The answer is 0.0072815837438818. Suppose you are converting between moles and grams of phosphorus trichloride. You can view details for each unit of measure. Molecular weight or grams of phosphorus trichloride The molecular formula of phosphorus trichloride is PCl3.

The SI base unit of substance quantity is the mole.

1 mole equals 1 mole of phosphorus trichloride or 137.332761 grams.

1 mol PCl₃=6.022×10²³molecules

3.51mol PCl₃ =3.51×6.022×10²³

=2.11x10²⁴

Number of atoms present in 1 molecule of PCl₃ =4

108.81 grams of phosphorus are present in 3.51 moles of phosphorus trichloride PCl3. The molecular formula of Phosphorus trichloride is PCl3.

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The value of k for the reaction in min is 66.5 min will take 82.3% of the compound to decompose.

A first-order reaction is a chemical process in which the rate of the reaction is linearly correlated with the concentration of just one ingredient. In other words, a first-order reaction is a chemical reaction in which only one of the reactants experiences variations in concentration, and this causes the rate of the reaction to vary.

The concentration of one of the reactants determines the first-order reaction rate. The product of the concentrations of two reactants or the square of the concentration of a reactant determines the second-order reaction rate.

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Students are conducting an experiment to see what colors different salts turn when they are burned. Jack dares Rebecca to taste the other salts to see if they taste like regular table salt. She agrees and her mouth starts burning. Rebecca needs to learn how to behave in the class.

When you add salt to a fire, the flame's color will alter. This isn't because the salt is burning; rather, it happens because the flame's heat affects the energy of the salt's electrons, which causes photons of light to be released. When salt is "burned," a golden flame is frequently visible.

High blood pressure is known to increase the risk of stroke and other health issues, and it is also known to increase the chance of burning in salt. High salt consumption has also been linked in several studies to deteriorating brain function. So, if this occurs, plan for brain surgery and a dedicated teacher to assist the student with wiping and peeling bananas.

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The most energetic lights are those with higher frequency and lower wavelengths.

Electromagnetic radiation consists of waves of the electromagnetic area, which propagate via space and bring electromagnetic radiant power. It consists of radio waves, microwaves, infrared, light, ultraviolet, X-rays, and gamma rays. All of these waves shape a part of the electromagnetic spectrum.

Electromagnetic strength is radiant energy that travels in waves at the rate of light. it can additionally be described as radiant electricity, electromagnetic radiation, electromagnetic waves, light, or the motion of radiation. Electromagnetic radiation can switch heat.

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Given,

Solid object with an unknown mass

Heat absorbed = 1 x 10² J

Temperature change = 2 K

Before calculating the object's heat capacity let us know what is heat capacity-

q= CΔT

∴ C = q/ΔT

Here,

C= Heat capacity

q= Heat absorbed

ΔT =Temperature change

C = 1x10² / 2

C = 100/2

C = 50 J/K

Hence, heat absorbed is 50 joule/ kelvin.

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Heat Capacity is 50 J/K.

Given, a solid item of undetermined mass

Absorbed heat equals 1 x 10² J

Change in temperature = 2 K

Let's first define heat capacity so that we can calculate the heat capacity of the object:

• Heat capacity is the amount of energy needed to raise an object's temperature by a unit.

•A physical characteristic of matter is its capacity for heat or thermal energy.

• The proportion of absorbed heat to temperature change is known as the heat capacity.

q= CΔT

∴ C = q/ΔT

Here,

Heat capacity =  C

q = Heat taken in

Change in temperature= T

C = 1x10² / 2

C = 100/2

C = 50 J/K

Hence, Heat Capacity is 50 joule / kelvin.

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47.78 grams of Na₃ AlO₃ is produced when  6 × 10²³ molecules of NaOH are consumed.

An equation for a chemical reaction is said to be balanced if both the reactants and the products have the same number of atoms and the total charge for each component of the reaction.

The balanced equation:

2 Al + 6 NaOH --------> 2 Na₃ AlO₃ + 3 H₂

We have 6 × 10²³ molecules of NaOH.

So, the mass of Na₃ AlO₃ will be:

= 6 × 10²³ molecules NaOH × ( 1 mol NaOH / 6.023 × 10²³ molecules NaOH ) × ( 2 mol Na₃ AlO₃ / 6 mol NaOH) × ( 143.9 g Na₃AlO₃ / 1 mol Na₃ AlO₃ )

= 47.78 g Na₃ AlO₃

The mass of Na₃ AlO₃ produced when 6 × 10²³ molecules of NaOH are consumed is 47.78 grams.

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Answer:

The temperature changed from 25°C to 10°C when exposed to ice.

Explanation:

The method used to separate a mixture of ethyl alcohol and water is distillation. Thus option (d) is true.

Distillation is defined as a process involving the conversion of liquid into vapor that is subsequently condensed back into liquid form.

It is a widely used method for separating the mixture based on difference in conditions required to change the phase of components.

Some of the types of distillation are:

Thus, the method used to separate a mixture of ethyl alcohol and water is distillation. Thus option (d) is true.

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Your question is incomplete, but most probably your complete question was

The apparatus in Image A above is used to separate a mixture of ethyl alcohol and water. The mixture is heated in the flask on the left and the ethyl alcohol drips into the flask on the right after condensing in the cooling tube in the middle. Which method was used to separate the mixture?

a. chromatography

b .filtration

c .sorting

d distillation

percent yield of Cu (OH)2 is 85%

CuSO4 + 2 NaOH >>> Cu (OH)2 + Na2SO4

calculate the percentage yield

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Answer:

Hydrogen

Explanation:

0.0293 m is the molarity of the solution 1.928 g of kno3 into enough water to make 651 ml.

Molar concentration, also known as molarity, quantity concentration, or substance concentration, is a unit used to describe the amount of a substance in a solution expressed as an amount of substance per unit volume of solution. The number of moles per liter, denoted by the unit sign mol/L or mol/dm3 in SI units, is the most often used unit denoting molarity in chemistry. One mol/L of a solution is referred to as one molar, or 1 M.

Because most solutions' volumes only slightly vary with temperature due to thermal expansion, the use of molar concentration in thermodynamics is frequently not practical. Most of the time, this issue may be rectified by adding temperature correction factors or by utilizing a temperature-independent metric.

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An osmolarity of saline solution is 308 mosmol/L.

m(NaCl) = 9 g; the mass of sodium chloride

V(solution) = 1 L; the volume of the saline solution

n(NaCl) = 9 g ÷ 58.44 g/mol

n(NaCl) = 0.155 mol; the amount of sodium chloride

number of ions = 2

Osmotic concentration (osmolarity) is a measure of how many osmoles of particles of solute it contains per liter.

The osmolarity = n(NaCl) ÷ V(solution)  × 2

The osmolarity = 0.154 mol ÷ 1 L × 2

The osmolarity = 0.154 mol/L × 1000 mmol/m × 2

The osmolarity of the saline solution = 308 mosm/L.

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If the concentration of y is doubled then rate of reaction will increase by a factor of 4.

The speed at which a chemical reaction moves forward is known as the reaction rate in chemistry. It is frequently described in terms of either the concentration of a reactant that is consumed in a unit of time or the concentration of a product that is generated in a unit of time (amount per unit volume).

The four key variables that determine reaction rate are reactant concentration, the physical state of the reactants, surface area, temperature, and the presence of a catalyst.

For instance, because it happens quickly, wood burning has a high reaction rate, whereas iron rusting has a low reaction rate because it happens gradually.

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Answer: a) 3.72 x [tex]10^{-11}[/tex]

b) 4.5 x [tex]10^{10}[/tex]

Explanation:

a. 0.0000000000372

= 3.72 x [tex]10^{-11}[/tex]

b. 45,000,000,000

= 4.5 x [tex]10^{10}[/tex]

The frequency released in transition energy is  4.57 x 10¹⁴ Hz.

We need to know about transition energy to solve this problem. Electrons in a hydrogen atom can move to another level of energy. It is also called a transition. In this process, electrons will absorb or release their energy to move. The transition energy can be determined as

ΔE = E2 - E1

where ΔE is transition energy, E2 is the final state of energy and E1 is the initial state of energy.

The state energy of a hydrogen atom can be calculated by

E = -(13.6) / n² eV

E = h.f

where n is the number of energy states, h is Planck constant (4.136 x 10¯¹⁵ eV/Hz), f is frequency.

From the question above, we know that

n1 = 3

n2 = 2

By substituting the following parameter, we get

ΔE = E2 - E1

ΔE = -(13.6) / n2² - (-(13.6) / n1²)

ΔE = -(13.6) / 3² - (-(13.6) / 2²)

ΔE = 3.4 - 1.51

ΔE = 1.89 eV

Calculate the frequency released

ΔE = 1.89 eV

h.f = 1.89

4.136 x 10¯¹⁵ . f = 1.89

f = 4.57 x 10¹⁴ Hz

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percentage of a radioactive sample that remains after four half-lives have passed is 6.25 %

As radioactive substances are first-order reactions and first-order reactions have a constant half-life and are represented by t1/2. t1/2 = 0.693 / λ

half-life is the time period for the sample to become half of its original concentration.

so for 1 st half-life, the substance will become 100 / 2 =50%

for 2 nd half-life, the substance will become 50 / 2 = 25%

for 3 rd half-life, the substance will become 25 / 2 = 12.5%

for 4 th half-life, the substance will become 12.5 / 2 = 6.25%

percentage of a radioactive sample that remains after four half-lives have passed is 6.25 %

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There is 0.078 grams of copper in a penny.

d = 7.20 g/cm³; density of a penny

diameter of a penny = 19.05 mm

thickness of a penny = 1.52 mm

area of a penny = π/ × (d/2)²

area of a penny = 3.14 × (19.05 mm/2)²

area of a penny = 285 mm²

Volume of a penny is the measure of the amount of space occupied by a penny.

volume of a penny = 285 mm² × 1.52 mm

volume of a penny = 433.2 mm³ = 0.4332 cm³

mass of a penny = 0.4331 cm³ × 7.20 g/cm³

mass of a penny = 3.12 g

mass of a copper = 2.50 % × 3.12 g ÷ 100%

mass of a copper = 0.078 g

number of a copper atoms = 0.078 g ÷ 63.54 g/mol × 6.022×10²³

number of a copper atoms = 7.39×10²⁰

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Answer:

yes

Explanation:

corrosion, wearing away due to chemical reactions, mainly oxidation (see oxidation-reduction, oxide). It occurs whenever a gas or liquid chemically attacks an exposed surface, often a metal, and is accelerated by warm temperatures and by acids and salts.

The coefficients needed in the balanced equation for the combustion of methane, [tex]CH_{4}[/tex] + [tex]2O_{2}[/tex] = [tex]CO_{2}[/tex] + [tex]2H_{2} O[/tex], is 1 for methane and carbon dioxide and 2 for oxygen and water.

The coefficients are numerical numbers in front of element or formula in a balanced equation. It shows the number of elements that should react with the number of other elements to produce a particular amount of chemical products.

The combustion reaction of methane is as follows:

[tex]CH_{4}[/tex] + [tex]O_{2}[/tex] = [tex]CO_{2}[/tex] + [tex]H_{2} O[/tex]

To balance this combustion reaction, the number of atoms of each element in the reactant side must be equal to the number of atoms of each element in the product side.

1. Balance C.

[tex]CH_{4}[/tex] + [tex]O_{2}[/tex] = [tex]CO_{2}[/tex] + [tex]H_{2} O[/tex]

2. Balance H.

[tex]CH_{4}[/tex] + [tex]O_{2}[/tex] = [tex]CO_{2}[/tex] + [tex]2H_{2} O[/tex]

2. Balance O.

[tex]CH_{4}[/tex] + [tex]2O_{2}[/tex] = [tex]CO_{2}[/tex] + [tex]2H_{2} O[/tex]

Hence, the coefficients of the balanced equation are 1 for methane and carbon dioxide and 2 for oxygen and water.

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Ten radish seeds were added to container A. Container B had no radish seeds. The purpose of the container B in this experiment is to serve as a control container.

By using controls, the experimenter can reduce the impact of factors other than the one being researched. This allows us to verify that an experiment is testing what it says it is testing. Controls are important for all sorts of experimental testing, regardless of the subject, and this goes beyond science.

Methylene blue is usually employed as a redox indicator in analytical chemistry. The solutions of this chemical are blue when in an oxidizing environment, but turn colorless when exposed to a reducing agent.

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Using the formula E=(k)(q/r^2),

if q changes to 2q and r changes to 2r,

then, electric field will be:

E = (k) (2q/ 4r^2) = (k)(q/2r^2) = E/2

So, Electric field = E/2

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A chemical species' concentration in a solution, specifically the amount of a solute per unit volume of solution, is measured by its molar concentration.

The amount of a solute per unit volume of a solution, or the concentration of a chemical species in a solution, is expressed as a solute's molar concentration. The most used unit for expressing molarity in chemistry is the number of moles per litre, represented by the unit sign mol/L or mol/dm3 in SI units.

The molarity of a substance refers to how much of it is present in a given volume of solution (M). Molarity is the measure of how many moles of a solute are present per litre of a solution. Molarity is also referred to as a solution's molar concentration. Molarity is the measure of a solute's concentration in moles per litre in a solution (). Molality is the ratio of moles of solute to kilograms of solvent ().

with units of [tex]$\mathrm{mol} \cdot \mathrm{L}^{-1}$[/tex]..

For  molarity  we take the quotient moles of solute/ volume of solution

And so.... [tex]$\frac{\frac{3.46 \cdot g}{58.44 \cdot \mathrm{g} \cdot \mathrm{mol}^{-1}}}{50.0 \cdot m L \times 10^{-3} \cdot L \cdot m L^{-1}}= \cdot \mathrm{mol} \cdot L^{-1} \ldots$[/tex]

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Rutherford’s model of an atom changed scientific knowledge through his assumptions that the atom was made up of a nucleus with positively charged particles.

This is defined as a procedure which is carried out by scientists in other to support or refute a hypothesis and also to ascertain its authenticity through various processes.

Rutherford bombarded a piece of gold foil with alpha particles which also has a positive charge and he discovered almost all the particles went through it.

This made him infer that the gold atoms were mostly empty space thereby leading him to propose his model of atom and made scientists discover that there was proton present in the nucleus of an atom which was used as a foundation by others in discovering more information and details about an atom.

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A liquid with a density of 0.890 g/ml has a volume of 18.2 ml. its mass in grams is:0.0489.

Gram Formula Mass = mass of the solute/formula mass of the solute. It is always expressed in the unit grams/mole (g/mol).

mass in grams= 0.890 g/ml/18.2 ml

                        =0.0489

Hence, Option d exists correct.

A liquid with a density of 0.890 g/ml has a volume of 18.2 ml. its mass in grams is:0.0489.

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