galena is an example of: a. a sulfate mineral b. a sheet silicate mineral c. an oxide mineral d. a halide mineral e. a sulfide mineral

Answer:

light energy --> electric energy ----> light and heat energy by the bulb

Explanation:

The energy transfers that make the bulbs light, starting with energy from solar energy to electrical energy and from electrical energy to heat & light energy.

Transfer of energy is a process in which one form of energy will convert into other form of energy, and total energy during this conversion is conserved. When the solar energy comes from the Sun and falls on the solar panel, then PV cells that are present in the panel will absorb this solar energy and generate electrical charge. This electrical charges are responsible for the flow of internal electricity inside the cell.This generated electricity used by the bulbs to generate light energy as well as heat energy.

Hence, Solar energy will convert in to electrical energy which in turn converts into light and heat energy.

To know more about conservation of energy, visit the below link:

https://brainly.com/question/166559

Answer:

1;1, 2;1, 3;1, 1;2, 1;1, 3;2, 1;3, 2;3, 1;1.

I hope this will help.

Answer:

This is what the answer looks like

Explanation:

Benzene can be produced by the use of three molecules of etheyne as shown.

The term benzene is a compound that is aromatic in nature. When we say that the compound is aromatic we mean that the compound is also satisfies the Huckel rule and there are [4n + 1] number of pi electrons in the molecule.

We can make a mole of benzene when we heat three moles of ethyne to a very high temperature. We have to recall that benzene is made up of three double bonds that are resonating and that the compound is quite stable. It does not undergo an addition reaction but it does undergo a substitution reaction.

The way that we can be able to produce benzene by the use of three molecules of ethyne have been shown in the image attached to this answer.

Learn more about benzene:https://brainly.com/question/14525517

#SPJ1

Answer: The heat energy produced is 53831.25KJ

Explanation:

METHANE is the main component of natural gas. It can undergo combustion reaction in air with a bright blue flame to produce carbondioxide and water. The heat of reaction (enthalpy) is negative because heat is absorbed during the chemical reaction. To calculate the heat energy produced by the combustion of one kilogram (1 kg) of methane the following steps are taken:

Molecular mass of methane =16 gm/mol.

So moles of 1 kg methane =

Given mass of methane ÷ molecular weight of methane

But the given mass = 1kg = 1000g

Therefore,

moles of 1000g methane = 1000÷16

= 62.5 moles

Hence, energy evolved = (moles of methane) × (heat of combustion)

Therefore,

heat energy produced= 62.5 × (-861.3kj)

= -53831.25kj

​

The heat energy produced by the combustion of one kilogram of methane is –53831.25 KJ

We'll begin by calculating the number of mole in 1 Kg of CH₄

Mass of CH₄ = 1 kg = 1000 g

Molar mass of CH₄ = 12 + (4×1) = 16 g/mol

Mole = mass /molar mass

Mole of CH₄ = 1000 / 16

CH₄ + 2O₂ —> CO₂ + 2H₂O ΔH = –861.3 KJ

From the balanced equation above,

1 mole of CH₄ reacted to produce –861.3 KJ.

Therefore,

62.5 moles of CH₄ will react to produce = 62.5 × –861.3 = –53831.25 KJ

Thus, –53831.25 KJ of heat energy is produced.

Complete Question is located in the attached photo

Learn more: https://brainly.com/question/13671340

Explanation:

d

hdjdjdjdjejdjjeuwuwuw

Answer:

D

Explanation:

I have this test as well

Gas chromatography can be used to tentatively identify a compound from its retention time. D. Retention time.

What is chromatography? Chromatography is a method of separating out chemicals from a mixture by moving them through a material. Chromatography is a popular method for identifying and separating different chemical components in a complex mixture. The working principle of Chromatography is that the components of a mixture are separated based on their ability to adhere to a surface, i.e. the stationary phase, and their capacity to move across that surface, i.e. the mobile phase.

Gas chromatography is a powerful analytical method for the separation and quantitation of organic compounds based on their molecular characteristics. Gas chromatography is an essential method used in analytical chemistry for the qualitative and quantitative analysis of mixtures of substances. In gas chromatography, the components in a mixture are vaporized and then separated based on their distribution between a stationary liquid phase and a mobile gas phase that passes through the stationary phase. Each component is identified based on its retention time, which is the amount of time it takes for the component to travel through the column and reach the detector. Therefore, a compound can tentatively be identified by gas chromatography from its retention time. Answer: D. Retention time.

To know more about chromatography visit:

https://brainly.com/question/11960023

#SPJ11

Answer:

Notice that the total charge (2-) is the same on both sides of the equation, and that this is reaction can take place in both directions.

Explanation:

Answer:

no. of neutron=51

2. Cr: no. of protons= 24

no. of neutron=28

3. S: number of protons=16

number of neutrons =16

4. BR : number of proton=35

number of neutron =46

Explanation:

In the given questions;

the numerator is atomic mass and in denominator there is atomic number.

GHz in the axial position causes more steric strain than H would CN A ) µ ) - H ie I CH , also requires more Go to go from eq → ax which is less preferred / stable than CN ( which is more linear ).

Please refer images for better understanding.

Methyl group is axial is 1-methylcyclohexane. After a ring flip the methyl group is equatorial and more stable by 7 kilojoule per mole.

The 1,3-diaxial interactions that result from the axial methyl group's steric crowding with the two axial hydrogens that are situated on the same side of the cyclohexane ring are what cause the energy difference between the two conformations. Axially oriented substituents experience more steric crowding than equatorially oriented ones because axial bonds are parallel to one another. As a result, substituted cyclohexanes will gravitate toward conformations with bigger substituents oriented equatorially. Since there is no strain when the methyl group is in the equatorial position, the equatorial conformer is more stable and is therefore preferred in the ring flip equilibrium.

Learn more about axial position here :

brainly.com/question/17352992

#SPJ4

Motion is the act of shifting one's position.

The physics term for a body's position or orientation changing over time. Translation is the movement along a straight or curved path.. Rotation is a motion that modifies a body's orientation.

According to the information provided,

a body is said to be in motion if its position varies over time. Speed, velocity, distance traveled, displacement, acceleration, and time may all be quantitatively described.

Physics' discipline of kinematics discusses a body's motion without mentioning its cause, while dynamics examines forces as well as how they affect motion.

When it is discovered that an object is not altering its location with respect to a certain frame of reference, it is said to be at rest. Another word for the condition of rest is stationary.

Thus, we could draw the conclusion that motion is the process by which an object's location changes over time.

to know more about Motion visit;

https://brainly.com/question/3421105

#SPJ9

The value of 8D of water vapor in isotopic equilibrium with fresh water whose 8D value is -65%0 is -67.79125‰.

The expression for calculating 8D of water vapor in isotopic equilibrium with fresh water can be given by: 8D = α 8D (vapor) + (1 - α) 8D (liquid). Where,α is a fractionation factor and 8D (vapor) and 8D (liquid) are the deuterium enrichments in water vapor and liquid, respectively.

The value of α is given by:a (liquid-vapor) = 1.090So,α = (a (liquid-vapor) - 1) / (a (liquid-vapor) + 1)α = (1.090 - 1) / (1.090 + 1)α = 0.045So,8D = α 8D (vapor) + (1 - α) 8D (liquid)Given,8D (liquid) = -65‰ (‰ denotes permil, which is equal to parts per thousand)

Substitute the given values in the expression and simplify:8D = 0.045 × 8D (vapor) + (1 - 0.045) × (-65)8D = 0.045 × 8D (vapor) - 61.9258D + 2.79125 = 8D (vapor)

Therefore,8D (vapor) = 8D - 2.79125= -65 - 2.79125= -67.79125‰ (answer)Therefore, the value of 8D of water vapor in isotopic equilibrium with fresh water whose 8D value is -65%0 is -67.79125‰.

To learn more about vapor visit;

https://brainly.com/question/32499566

#SPJ11

The range of the of the oxidation number of the first transition series is +2 to +6.

Transition elements or transition metals are elements or metals that have partially filled d orbitals.

The first main transition series begins with either;

Thus, the range of the of the oxidation number of the first transition series is +2 to +6.

Learn more about oxidation number here: https://brainly.com/question/27239694

#SPJ1

Answer: 2.5 grams

Explanation:

Expression for rate law for first order kinetics is given by:

\(t=\frac{2.303}{k}\log\frac{a}{a-x}\)

where,

k = rate constant

t = age of sample

a = let initial amount of the reactant

a - x = amount left after decay process  

a) to calculate the rate constant:

Half life is the amount of time taken by a radioactive material to decay to half of its original value.

\(t_{\frac{1}{2}}=\frac{0.693}{k}\)

\(k=\frac{0.693}{2years}=0.346years^{-1}\)

b) to find amount left after 4 years

\(4=\frac{2.303}{0.346}\log\frac{10}{a-x}\)

\((a-x)=2.5g\)

Thus 2.5 g of cesium would remain from a 10 g sample after 4 years

The process of spectroscopy determines a substance's physical or chemical identity with as near absolute certainty as existing analytical techniques will permit.

Spectroscopy is the study of the interaction of electromagnetic radiation with matter and is a crucial tool in chemical analysis. By studying the spectrum of a substance (the way it absorbs, emits, or reflects light), spectroscopy can provide information about the composition, structure, and properties of the substance, thereby allowing for its identification with high accuracy.

Spectroscopy is a broad and interdisciplinary field that encompasses many different techniques for studying the interaction of electromagnetic radiation with matter. It plays a crucial role in various areas of science, including physics, chemistry, biology, and materials science. Spectroscopy provides information about the composition, structure, and properties of substances by analyzing the way they interact with light.

Learn more about spectrum here:

https://brainly.com/question/6836691

#SPJ4

Answer:  6.022 × 10²³

Explanation:

Avogadro's Number (6.022 × 10²³ atoms/mole) is the number of atoms in any mole of a substance.

The two given triangles ΔABC and ΔCDA are congruent. Therefore, option (A) is correct.

The Square can be described as a polygon with four sides. The total interior angle of a rectangle is equal to 360 degrees. A square's sides are always parallel and equal, and each angle of the square is equal to 90 degrees. The diagonals of a square are of the same length and intersect in the center.

The Square is ABCD is shown below in the attached diagram:

In triangles ΔABC and ΔCDA have,

AB = CD  (opposite sides)

BC = AD   (opposite sides)

∠ABC = ∠ADC = 90° (angles)

Therefore, the given two triangles ΔABC and ΔCDA are congruent.

Learn more about the Square, here:

brainly.com/question/23944799

#SPJ1

The balanced chemical equation is as follows:

4KClO₃ ₍s₎ ⇒ 3KClO₄ ₍s₎ + 3KCl

The term balanced chemical equation is defined an equation where the number of atoms of each type in the reaction is the equal on both reactants and product sides.

The chemical equation must be balanced in order to obey the law of conservation of mass. When the number of different atoms of elements in the reactants side equals the number of atoms in the products side, the chemical equation is balanced.

Thus, The balanced chemical equation is as follows:

4KClO₃ ₍s₎ ⇒ 3KClO₄ ₍s₎ + 3KCl

To learn more about the balanced chemical equation, follow the link;

https://brainly.com/question/28294176

#SPJ1

Explanation and Answers:

If we compare the properties of the sample #4 with the sample #2 we will find that:

a) What two piece of evidence support her claim?:

- The color of sample #4 is silver, it is the same color as the color of aluminum.

- Sample #4 conducts the electricity, the same as aluminum.

b) What one piece of evidence refutes her claim?:

- The density of sample #4 is different from the density of aluminum.

c) Why does this evidence refute her claim?

Because the density is a property that is characteristic of each metal, if the sample #4 has a density different from aluminum it can't be aluminum.

Answer:

Carbon dioxide

Explanation:

that's all I can say

Answer:

≈15

Explanation:

1.43-.96=.57

.57/1.43 (change / original) * 25 ≈ 9.96

25 - 9.96 ≈ 15

Answer:

Refer to the attachment

Answer:

1. How to Act Like a President

2. Developing a Presidential Style

3. The Institutional Workings of the Presidency

4. Polling Public Opinion, Before Polls

5. Managing a Quarrelsome Cabinet

The coulombic contribution to bonding stronger is in mgo

Coulomb interaction is the electrostatic interactions between electric charges, and follows the Coulomb's law.

It is a basis of classical electrodynamics. In general, Coulomb interaction can manifest itself on various scales from microscopic particles to macroscopic bodies.

When unlike charges (one negative and the other positive) attract each other, or like charges (both positive or both negative) repel each other, Coulomb's law governs the force between them. According to this law the force of attraction or repulsion varies inversely with the square of the distance between the charges.

Higher the magnitude of the charges we have higher coulombs force of attraction. Thus, we can say that the molecule MgO has a higher attraction force between them and has a stronger ionic bond than LiF.

To know more about coulombs law click here:

https://brainly.com/question/506926

#SPJ4

Answer:

4.816x10²⁴atoms

Explanation:

the number of moles of oxygen is 8

let x be number of oxygen atoms

recall that 1 mole=6.02x10^23 atoms

therefore, 8 moles =x

cross multiply

8 x 6.02 x 10^23 = x

x = 4.816 x 10²⁴atoms

The mass of the corresponding sodium salt of the conjugate base which is required to make the buffer with a pH of 7.64 is 18.7 grams. This can be calculated through Henderson-Hasselbalch equation.

The Henderson-Hasselbalch equation can be used to calculate the mass of the corresponding sodium salt of the conjugate base. Here is the equation:

pH = pKa + log₁₀( A⁻/ HA)

Since the pH of the buffer is given, the pKa can be calculated using the formula:

pH = pKa + log₁₀( A⁻/ HA)

pKa = pH - log₁₀( A⁻/ HA)

pH = 7.64

concentration of the acid [HA] = 0.10 m

Molar mass of the acid (MA) = 75 g/mol

Molar mass of the sodium salt of the conjugate base (MB) = 85 g/mol

( A⁻/ HA) = 10^(pH-pKa) = 10^(7.64-4.74) = 4.4

Since the concentration of the acid and the volume are known, we can find the number of moles of the acid.

n(HA) = M(HA) × V(HA) = 0.10 × 0.5 = 0.05 moles

Now we can calculate the number of moles of the conjugate base by multiplying the number of moles of the acid by:

n(HA) = 0.05 × 4.4 = 0.22 moles

Finally, we can find the mass of the conjugate base by multiplying the number of moles by the molar mass and rounding the result to two significant figures. We get, Mass of the corresponding sodium salt of the conjugate base = 0.22 × 85 = 18.7 g (rounded to two significant figures).

Learn more about Conjugate base here:

https://brainly.com/question/30225100

#SPJ11

The molar mass (g/mol) of the unknown solid is 155.36 g/mol.

A sample size of unknown solid acid, m = 0.615 g, The concentration of NaOH, c = 0.1032 m, The mole ratio of the unknown solid to NaOH is 1:1, The volume of NaOH used, V = 38.26 mL

We can calculate the number of moles of NaOH used as follows,

n = c * V / 1000 = 0.1032 * 38.26 / 1000 = 0.00395632 mol

Since the mole ratio of an unknown solid to NaOH is 1:1, we know that the number of moles of an unknown solid is also 0.00395632 mol.

The molar mass of the unknown solid can be calculated as follows,

M = m / n = 0.615 / 0.00395632 = 155.36 g/mol

Therefore, the molar mass of the unknown solid is 155.36 g/mol.

Know more about Molar mass here :

https://brainly.com/question/837939

#SPJ11

Answer:

Explanation:

it is tough question plz give me some time i would give you your ans soon

Answer:

A joule divided a second

Explanation:

i took the test

plz give me brainlist :)

The energy of the ground state of a He+ ion can be calculated using the formula:
the energy of the ground state of a He+ ion is lower than that of a hydrogen atom. The energy of the ground state is an important property of an atom or ion, as it determines the chemical and physical properties of the element.

Energy of He+ ion = Energy of H atom / (Z²)

where Z is the atomic number of He+, which is 2. Substituting the values, we get:

Energy of He+ ion = -13.6 eV / (2²) = -3.4 eV

Therefore, the energy of the ground state of a He+ ion is -3.4 eV.

The ground state energy of a hydrogen atom is -13.6 eV, which is the energy required to remove the electron from the atom completely. To calculate the energy of the ground state of a He+ ion, we use the formula Energy of He+ ion = Energy of H atom / (Z²), where Z is the atomic number of He+. Substituting the values, we get the energy of the He+ ion's ground state as -3.4 eV. This means that the He+ ion requires less energy to remove its electron compared to the hydrogen atom due to the higher nuclear charge of the He+ ion.

The energy of the ground state of a He+ ion is -3.4 eV, which is lower than the energy of the ground state of a hydrogen atom. This is because the He+ ion has a higher nuclear charge than hydrogen, which attracts the electron more strongly and requires less energy to remove it.

To know more about He+ ion visit:

brainly.com/question/2886630

#SPJ11

A carbon-carbon bond has an average bond dissociation energy of 410 kj/mol. The energy of UV radiation at wavelength 292 in nanometers is 410 kj/mol.

The wavelength of a wave is the separation between its two crests or troughs. In the direction of the wave is measured.

The wavelength of a wave is the distance it travels between its crests and troughs (which may be an electromagnetic wave, a sound wave, or the any other wave). The peak of a wave is at its crest, and its trough is at its top. It is given in length units like meters, centimeters, millimeters, and nanometers because wavelength is a measurement of both length and distance.

Light's wavelength changes with color, meaning that it differs for each hue. Violet has the shortest wavelength while red has longest. Compared to violet light, UV radiation has a shorter wavelength. In a similar vein, infrared energy has a larger wavelength than red light.

To know more wavelength visit: https://brainly.com/question/13533093

#SPJ4