Convert the following descriptions into balanced equations:
(a) In a gaseous reaction, hydrogen sulfide burns in oxygen to form sulfur dioxide and water vapor.

Answer:

B. 20m/s

Explanation:

The wavelength of a wave can be calculated using the formula;

λ = v/f

Where;

λ = wavelength (m)

v = velocity (m/s)

f = frequency (Hz)

According to the information provided in this question; the wave has a wavelength (λ) of 2m and a frequency (f) of 10Hz.

Using λ = v/f

v = λ × f

v = 2 × 10

v = 20m/s.

Answer:

3 Hz

Explanation:

frequency = \(\frac{number of waves}{time}\)

thus \(f=\frac{6}{2}\) = 3 Hz

If there are 6 waves in a 2-second time frame, the frequency is 3 Hz. When a wave travels through a medium, the frequency describes how frequently the medium's particles vibrate.

The frequency identifies the frequency at which the particles of the medium vibrate as a wave passes through it.

Frequency = number of waves ÷time

The number of waves is  6 and time is 2 second

     f = 6 ÷ 2

      =  3

A disturbance or variation that causes energy to be transferred gradually from one point to another in a medium. It can be an elastic deformation or a change in pressure, electric potential, electric or magnetic intensity, or temperature.

Therefore, if there are 6 waves in a 2-second time frame, the frequency is 3 Hz.

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Answer:

The physical properties of matter are those characteristics that can be measured without altering the atomic structure, while the chemical properties of matter are those characteristics that result in a change in the atomic structure.

Answer:

History of composition

Years Material Weight (grains)

1944–1946 gilding metal (95% copper, 5% zinc) 48 grains

1947–1962 bronze (95% copper, 5% tin and zinc) 48 grains

1962 – September 1982 gilding metal (95% copper, 5% zinc) 48 grains

October 1982 – present copper-plated zinc (97.5% zinc, 2.5% copper) 38.6 grains

Answer:

Group 8 is a group (column) of chemical elements in the periodic table. It consists of iron (Fe), ruthenium (Ru), osmium (Os) and hassium (Hs). They are all transition metals.

Explanation:

The periodic chart has a group (column) of chemical elements called Group 8. Iron (Fe), ruthenium (Ru), osmium (Os), and hastium are the main elements (Hs). All of them are transitional metals.

The Group 8A elements have very little ability to gain or lose electrons to form ions or share electrons with other elements in covalent bonds.

The number of valence electrons shared by elements belonging to the same group is constant. As a result, the physical and chemical properties of elements belonging to the same group are comparable.

The group 8 elements are suitable as cryogenic refrigerants because of their extremely low melting and boiling temperatures.

Therefore, iron (Fe), ruthenium (Ru), osmium (Os) and hassium (Hs) are elements of group 8.

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As the elements of Group 16 (VIA) are considered from top to bottom on the Periodic Table, the covalent radii decrease and the ionization energies decreases.

What is Periodic Table?
The Periodic Table of Elements is an arrangement of all known chemical elements, arranged in order of atomic number, from the lightest (hydrogen) to the heaviest (uranium). The table is organized into rows and columns, with each element having its own unique properties. Elements are arranged according to their atomic number, number of protons, and electron configuration. The table also has information about the element’s chemical symbol, atomic mass, and physical properties. The Periodic Table helps scientists understand the structure of atoms, predict their chemical reactions, and the characteristics of their compounds. It also allows scientists to compare how elements interact with each other to form new substances.

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1. The number of mole of Fe₂(SO₄)₃ is 0.025 mole

2. The number of mole of Fe₂O₃ formed is 0.025

3. The mass of iron (iii) oxide formed is 4 grams

4. The number of mole of SO₃ produced is 0.075 mole

5. The volume of sulphur trioxide at rtp is 1.8 dm³

The number of mole of Fe₂(SO₄)₃ can be obtained as follow:

Mole = mass / molar mass

Mole of Fe₂(SO₄)₃ = 10 / 400

Mole of Fe₂(SO₄)₃ = 0.025 mole

The number of mole of Fe₂O₃ formed can be obtained as follow:

Fe₂(SO₄)₃ -> Fe₂O₃ + 3SO₃

From the balanced equation above,

1 mole of Fe₂(SO₄)₃ reacted to produced 1 mole of Fe₂O₃

Therefore,

0.025 mole of Fe₂(SO₄)₃ will also react to produce 0.025 mole of Fe₂O₃

Thus, the number of mole of Fe₂O₃ formed is 0.025 mole

The mass of iron (iii) oxide, Fe₂O₃ formed can be obtained as follow:

Mass = Mole × molar mass

Mass of iron (iii) oxide, Fe₂O₃ = 0.025 × 160

Mass of iron (iii) oxide, Fe₂O₃ = 4 grams

The number of mole of SO₃ produced can be obatined as follow:

Fe₂(SO₄)₃ -> Fe₂O₃ + 3SO₃

From the balanced equation above,

1 mole of Fe₂(SO₄)₃ reacted to produced 3 moles of SO₃

Therefore,

0.025 mole of Fe₂(SO₄)₃ will react to produce = 0.025 × 3 = 0.075 mole of SO₃

Thus, the mole of SO₃ produced is 0.075 mole

The volume of sulphur trioxide, SO₃ at rtp can be obtained as follow:

Volume of sulphur trioxide, SO₃ = mole × molar volume at rtp

Volume of sulphur trioxide, SO₃ = 0.075 × 24

Volume of sulphur trioxide, SO₃ = 1.8 dm³

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When the two atoms in such a covalent polar bond share the bond's electrons unequally.

The smallest elemental component of an atom, the electron has a negative charge. In a neutral atom, there are an equal amount of protons and electrons. A electrons and one proton are all that the hydrogen atom has. On the contrary hand, the uranium atom possesses 92 protons, which means 92 electrons.

The negatively charged components of an atom are called electrons. The total negative charge of an atom's electrons counteracts that positive charge of its protons inside the atomic nucleus.

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Answer:

This all should be correct:

c

a

c

a

Answer:

C, A, B, B

Explanation:

Question 1: C. inner core

Why? Because the inner core is literally the center of the Earth. Meaning it is the hottest part of the Earth.

Question 2: A. crust

Why? The crust is the outer most layer which is the layer we walk on so to speak. The Earth can be broken up into four layers and as said before the crust is the outer part of it. It is actually amounts to less than 1% of Earth's volume.

Question 3: B. basalt

Why? If we were to average the oceanic crust we would get something around six kilometers and this is the thickness. This is mostly made up of basalt.

Question 4: B. outer core

Why? Due to difference in pressure and temperature the outer core tends to release dense matter which sinks while warm (less dense rises). This causes the Coriolis force, resulting from the Earth's rotations.

Answer:

any data should work as long as you get the question right it should be all fine if you i had this question once and i different sums of data each or each way i did it.

Two possible sources of systematic (determinate) error in the experiment are; Incorrect calibration of volumetric glasswareIncorrect mass of NaCl

To calculate the concentration of NaCl in the resulting solution in mg/L NaCl, we can use the formula; Concentration (mg/L) = (Mass of solute ÷ Volume of solution in L) × 1000 g / 1 mg NaCl is present in the stock solution of 25 mL. So, the mass of NaCl in the solution would be;0.0842 g ÷ 25 mL = 0.00337 g/mL. Now, in the resulting solution, a 1.00 mL aliquot of the stock solution is transferred to a 50.00 mL volumetric flask and diluted to volume. Therefore, the volume of the resulting solution is 50.00 mL. We will substitute these values in the formula, Concentration (mg/L) = (0.00337 g/mL ÷ 50 mL) × 1000 g / 1 mg concentration (mg/L) = 67.4 mg/L. Therefore, the concentration of NaCl in the resulting solution in mg/L NaCl is 67.4 mg/L.7.  Concentration = 67.4 mg/LTolerance = 4.28 mg/LTotal concentration = 67.4 + 4.28 mg/L = 71.68 mg/LWe round off this value to one decimal place; Total concentration = 71.7 mg/LTherefore, the concentration of NaCl in the resulting solution using propagation of error through the calculation is 67.4+0.4 mg/L.8. Two possible sources of random (indeterminate) error in the experiment are; Errors in temperature measurement. Errors in measurement of water volume. Two possible sources of systematic (determinate) error in the experiment are; Incorrect calibration of volumetric glasswareIncorrect mass of NaCl.

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Answer:

23

Explanation:

there are 23 pairs of chromosomes

46 individula chromosomes

but each parnet contribute one chromosome to each pair

Answer:

23 :)

Explanation:

Answer:

In the followings below, the one that doesn't attract to magnets is:

Option 4, Aluminum.

Explanation:

Mainly because of the aluminum's crystal structure.

Hope this helped you out! ^^

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Answer:

Aluminum

Explanation:

Ferromagnetic Metals

Ferromagnetic metals and alloys are the only magnetic metals. Out of all of the elements on the periodic table, there are only 3 metals that are attracted to magnets: iron, nickel, cobalt.

Aluminum

Aluminum is a nonferrous metal (meaning not including iron or steel) that does not include any ferromagnetic metals. Additionally, aluminum itself is not magnetic, so there is no attraction between aluminum and a magnet.

The molar concentration of the barium hydroxide solution is 0.1379 M.

To find the molar concentration of the barium hydroxide solution, we can use the equation:

Molarity of acid x Volume of acid = Molarity of base x Volume of base

We are given the volume and molarity of the acid solution, which is 38.65 mL and 0.0895 M, respectively. We are also given the volume of the base solution, which is 25.00 mL.

Let x be the molarity of the barium hydroxide solution. Substituting the given values into the equation, we get:

0.0895 M x 38.65 mL = x (25.00 mL)

Solving for x, we get:

x = (0.0895 M x 38.65 mL) / 25.00 mL = 0.1379 M

Therefore,0.1379 M is the molar concentration of the barium hydroxide solution.

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The compound most likely formed with magnesium, Mg, is MgX . The correct option is (A) MgX.

The electronic configuration of the element, X is 2,8,7. Since X is located in group 7 of the periodic table, it has 7 electrons in its valence shell. In order to obtain a stable configuration, the atom can either gain one electron to fill the 3rd energy level completely or lose seven electrons to completely empty the 2nd energy level, which is easier. The resulting ion, X-, would have a stable electronic configuration of 2,8. Hence, the compound most likely formed with magnesium, Mg, is MgX .The correct option is (A) MgX.

Explanation: Magnesium is located in group 2 of the periodic table and has two valence electrons in its outermost shell. It loses these two electrons to form Mg2+ ions with stable electronic configurations of 2,8. On the other hand, element X gains an electron to form X- ions with stable electronic configurations of 2,8.The combination of Mg2+ and X- ions results in the formation of the compound MgX with a neutral charge.

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Answer:

The beginning

Explanation:

In a nuclear reaction, the  rate of decay is fastest at the beginning of the process.

There are two types of nuclear reactions which are nuclear fusion and nuclear fission .They involve the combination and disintegration of the element's nucleus respectively.

In nuclear fission, the nucleus of the atom is bombarded with electrons of low energy which splits the nucleus in to two parts .Large amount of energy is released in the process.It is used in nuclear power reactors as it produces large amount of energy.

In nuclear fusion,on the other hand, is a reaction which occurs when two or more atoms combine to form a heavy nucleus.Large amount of energy is released in the process which is greater than that of the energy which is released in nuclear fission process.

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The name of the reaction that produces a β-hydroxyaldehyde is the "Aldol reaction." The Aldol reaction is a versatile organic reaction that involves the condensation of an enolizable aldehyde or ketone with another carbonyl compound, typically an aldehyde. In the reaction, a new carbon-carbon bond is formed, resulting in the formation of a β-hydroxyaldehyde or a β-hydroxyketone, depending on the nature of the reactants.

The reaction proceeds through the formation of an enolate ion or enol intermediate, which subsequently reacts with the carbonyl compound to form the aldol product. The reaction is named after the organic compound "aldol," which is a combination of aldehyde and alcohol, representing the characteristic functional groups present in the product. The reaction proceeds through the formation of an enolate intermediate, which then undergoes nucleophilic attack on the carbonyl carbon of the other reactant. The subsequent protonation yields the desired β-hydroxyaldehyde or β-hydroxyketone product. The aldol reaction is an important tool in organic synthesis, allowing for the formation of complex molecules with varied functionality.

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Schwenck et al. (2017) proposed a novel design of a convergent-divergent annular nozzle for close-coupled atomization in the field of powder metallurgy. The researchers aimed to enhance the atomization process by improving the spray pattern and droplet size distribution.

The design incorporated a unique combination of converging and diverging sections within the annular nozzle, which facilitated better control over the atomization process. Through experimental analysis and characterization, they demonstrated the effectiveness of this design in achieving finer droplet sizes and improved spray patterns compared to traditional nozzle designs. The findings of this study offer promising prospects for optimizing powder metallurgy processes and applications, potentially leading to advancements in materials science, additive manufacturing, and other related fields.

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The question is incomplete complete question is given below

Schwenck et al. (2017) introduced a novel convergent–divergent annular nozzle design for close-coupled atomisation in the field of powder metallurgy, as discussed in their article published in Powder Metallurgy journal.

The ligand-to-metal charge transfer (LMCT) band is a type of electronic transition in which an electron is transferred from a ligand to a metal ion in a complex. This results in the formation of a new bond between the metal and ligand.

The LMCT band typically occurs in the ultraviolet-visible (UV-Vis) region of the electromagnetic spectrum, with the exact wavelength depending on the specific ligand and metal ion involved. The energy required to promote an electron from the ligand to the metal ion is typically in the range of a few electron volts (eV). The LMCT band is an important tool for studying the electronic structure of transition metal complexes and can provide insight into the reactivity and properties of these compounds.

The ligand-to-metal charge transfer (LMCT) band is a type of electronic transition in which an electron is transferred from a ligand to a metal center within a coordination complex. This process typically occurs in the ultraviolet (UV) and visible regions of the electromagnetic spectrum.

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Since cobalt is not a noble gas, the only 2 things we need to look at in this situation are metal and transition element.

A chemical element with the atomic number 27 and the symbol Co is cobalt. With the exception of minor concentrations found in alloys of naturally occurring meteoric iron, cobalt is only ever found in the Earth's crust in a chemically mixed state. The free element created by reductive smelting is a hard, shiny metal that is silver-gray in colour.

Located in the middle of the periodic table of elements, the group of 28 elements known as transition metals includes cobalt. Many of the properties of transitional metals are shared. They have high melting and boiling temperatures and are quite hard, yet they are also malleable and ductile.

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Answer:

15 g

Explanation:

1. According to the Law of Conservation of Mass, the sum of the products should be 105 g because 70 g + 35 g = 105 g.

2. If 90g of solution was produced and there's supposed to be 105 g, then the remaining grams would be equal to the mass of the gas.

3. 105 g - 90g = 15 g

The correct answer is e. The net reaction that occurs in the cell involves the oxidation of copper (Cu) to form copper ions (Cu+), and the reduction of cadmium ions (Cd2+) to form cadmium metal (Cd). This is represented by the equation: 2Cu+ Cd2+ > 2Cu* + Cd.

In this reaction, Cu+ is the oxidizing agent, as it gains electrons and becomes reduced, while Cd2+ is the reducing agent, as it loses electrons and becomes oxidized. This reaction can be used to generate electrical energy in a cell, such as a battery. Overall, the net reaction involves the transfer of electrons from one species to another, resulting in the formation of a metal and an ion.

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(a) diameter of beaker: Vernier caliper

(b) mass of sugar: weighing balance

(c) volume of alcohol: volumetric flask

(d) temperature of air: Thermometer

A laboratory instrument is a tool used in scientific research, experiments, or analysis to measure, monitor, or analyze various parameters, properties, or quantities. These instruments are specifically designed to provide accurate and precise measurements in a controlled laboratory environment.

Here are explanations of the laboratory instruments mentioned:

1. Vernier caliper: A Vernier caliper is a measuring instrument used to measure dimensions such as length, diameter, or thickness with high precision. It consists of an outer scale and a sliding inner scale, allowing for precise measurements. The caliper can be used to measure the diameter of a beaker by gently placing the beaker between the jaws of the caliper and reading the measurement from the scales.

2. Weighing balance: A weighing balance, often referred to as a scale, is used to measure the mass of an object or substance. It provides an accurate measurement of weight by balancing the object being measured against known weights. To measure the mass of sugar, you would place the sugar on the weighing pan or platform of the balance and read the displayed mass.

3. Volumetric flask: A volumetric flask is a glass container used to measure and hold a specific volume of liquid. It has a precise volume calibration mark etched on its neck, indicating the intended volume. To measure the volume of alcohol, you would use a volumetric flask of the appropriate size, add the alcohol to the flask up to the calibration mark, and ensure that the meniscus of the liquid aligns precisely with the mark.

4. Thermometer: A thermometer is an instrument used to measure temperature. It typically consists of a glass tube with a calibrated scale and a temperature-sensing element, such as mercury or a digital sensor. To measure the temperature of the air, you would place the thermometer in the air and allow it to equilibrate, then read the temperature indicated on the scale or display.

[Original question attached]

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Answer:

just watch the video, what does it start with, write that down for each trial, then what does it end with, then starting mass - ending mass is the change mass

Answer:

Computer Models are used to study the complex phenomena in the universe.

Explanation:

The term 'models' can be defined as a representation of something that is real. A model is used to learn the phenomena of the natural world for easy understanding of it.

The computer models are used to study the large and complex data in the universe. These models are used to perform various calculations that, in real, would take years to do. It helps in studying the changes in variables, which in turn helps the scientist to know of any climatic change, or other changes in the nature.

Answer:

about 2 years I think, you might have to ask your dentist

Explanation:

Answer:

it really depens of ur treatment i had braces and it took a year and now i got them again and they say its gonna take a year so it depends on ur treatment

Explanation: