which elements have one valence electron?

Answer:

C. Large Asteroid

Explanation: Took the test. 100% sure.

One mole of fluorine gas gives one mole of chlorine gas. Hence, 291 g of chlorine gas is produced by 155 g of fluorine gas. 38 g of F₂ gives 66 g of cobalt fluoride. Hence, 291 g will give 505 g of cobalt fluoride.

Cobalt fluoride is an ionic compound formed by the combination between cobalt metal and chlorine gas.

As per the given reaction, one mole of F₂ gives, one mole of Cl₂.

molecular mass of F₂ = 38 g/mol

molecular mass of Cl₂= 71 g.

hence, mass of F₂ needed to produce 291 g of Cl₂ is:

(291 g × 38 g)/71 g = 155 g.

38 g of F₂ gives 66 g of CoF₂.

molar mass of CoF₂ = 66 g/mol.

Hence, mass of cobalt fluoride produced by 291 g of fluorine is :

(291 × 66)/38 g = 505.4 g

Therefore, 291 g of F₂ will produce 505 g of cobalt fluoride.

Find more on cobalt fluoride :

https://brainly.com/question/14602400

#SPJ1

Answer:

4.9 x 10²²hockey pucks

Explanation:

Given parameters:

Number of moles of hockey  = 0.0814moles

Unknown:

Number of pucks there = ?

Solution:

A mole of a substance is made up of Avogadro's number of particles.

Therefore;

       1 mole of hockey pucks will contain 6.02 x 10²³ hockey pucks

       0.0814 mole of hockey pucks will contain :

                              0.0814 x 6.02 x 10²³ = 4.9 x 10²²hockey pucks

Answer:

A:force times an object displacement

Explanation:

Answer:

B, E

Explanation:

Edge

Since the ions are held together by Strong electrostatic attractions, the amount of energy required is Large and ionic solids therefore have relatively High melting points.

Electrostatic forces are non-contact forces that push or pull on objects without actually making contact with them. A phenomenon known as "charge" can be transferred from one surface to another when certain materials are rubbed together. Uncharged objects are pulled by charged objects, while charged objects can be pushed or pulled by uncharged objects. Similar to the attraction between the opposing poles of two magnets, electrostatic attraction occurs when positively and negatively charged species move toward one another. Between two stationary point charges, the electrostatic force of attraction or repulsion is directly proportional to the product of their magnitudes and inversely proportional to the square of their separation. When the materials are rubbed together, electrons are taken out of their atoms, creating a static charge.

Learn more about electrostatic attractions here:

https://brainly.com/question/13665433

#SPJ4

NaOH should be added to the acid to fix the problem of higher pH of the water.

To neutralize acids, a weak base is used. Bases have a pH greater than 7. Sodium hydroxide, potassium hydroxide and ammonium hydroxide are the examples of bases.

When the acid reacts with base, this type of reaction is called neutralization reaction. So we can conclude that NaOH should be added to the acid to fix the problem.

Learn more about acid here: https://brainly.com/question/25148363

In order to get rid of the spilled HCl from the environment, the compound that should be added is NaOH and the reaction that will occur between the two compounds is called a neutralization reaction.

It is a reaction involving acids and bases resulting in the formation of salt and water.

The spilled HCl can be neutralized by a base to form salt and water.

Thus, the compound that should be added in order to get rid of the HCl is NaOH. The NaOH will react with the HCl as follows:

NaOH + HCl -------> NaCl + H2O

More on neutralization reactions can be found here: https://brainly.com/question/20038776

The atomic radius of Floridium atoms in the FCC unit cell is approximately 109.8 pm to one decimal place.

The face-centered cubic unit cell contains 4 atoms. The edge length of the unit cell can be calculated using the formula:
a = 2 * (radius of atom)
Therefore, the radius of each floridium atom can be calculated as:
radius of atom = a / (2 * sqrt(2))
radius of atom = 310.2 pm / (2 * sqrt(2))
radius of atom = 109.9 pm
Therefore, the atomic radius of floridium is 109.9 pm to one decimal place.
To find the atomic radius of Floridium atoms in a face-centered cubic (FCC) unit cell, we can follow these steps:
1. Recall the relationship between the edge length (a) and the atomic radius (r) in an FCC unit cell: a = √2 * 4r.
2. Solve for the atomic radius (r) using the given edge length (a = 310.2 pm).
Step 1: Relationship between edge length and atomic radius in an FCC unit cell
For an FCC unit cell, the relationship between the edge length (a) and the atomic radius (r) is given by the formula:
a = √2 * 4r
Step 2: Solve for the atomic radius (r)
We are given the edge length (a = 310.2 pm). We can plug this value into the formula and solve for r:
310.2 pm = √2 * 4r
Now, we need to isolate r by dividing both sides of the equation by 4√2:
r = (310.2 pm) / (4√2)
r ≈ 109.8 pm
Therefore, the atomic radius of Floridium atoms in the FCC unit cell is approximately 109.8 pm to one decimal place.

learn more about atoms here

https://brainly.com/question/14352690

#SPJ11

Metal ions such as Zn²⁺ and Fe³⁺ are often needed by enzymes as cofactors or prosthetic groups that facilitate enzymatic reactions.

These metal ions assist enzymes by stabilizing their structure, enhancing substrate binding, and participating directly in chemical reactions to accelerate catalysis. They help the enzymes achieve the necessary specificity and efficiency required for various biological processes.

For instance, Zn²⁺ is involved in the active sites of several metalloenzymes, such as carbonic anhydrase and carboxypeptidase. It typically acts as a Lewis acid, accepting electron pairs from substrates and facilitating the nucleophilic attack on the substrate. On the other hand, Fe³⁺ is found in enzymes like cytochrome P450 and catalase. It plays a vital role in redox reactions, participating in the transfer of electrons and enabling the conversion of substrates to products.

Overall, metal ions such as Zn²⁺ and Fe³⁺ are essential for proper enzyme function, as they help ensure the precise and efficient execution of various enzymatic processes vital to maintaining biological systems.

Learn more about catalysis here: https://brainly.com/question/30542891

#SPJ11

Answer:

you could've googled it but here.

Explanation:

The former OSHA limit for sodium hydroxide (also known as caustic soda or Iye) was 2 mg/m3 as an 8-hour TWA. OSHA proposed a 2-mg/m3 ceiling limit for sodium hydroxide, based on the ACGIH- and NIOSH-recommended limits.

Byzantium continued the traditions of the Roman Empire through its adoption of Roman administrative structures, legal systems, and the Christian religion.

It also preserved the Greek language and culture. However, Byzantium diverged from Rome by shifting its political and cultural center to the East, developing a distinct Byzantine art and architecture style, and establishing theocracy as a key aspect of its governance. Byzantium also faced different challenges, such as the rise of Islam and the fragmentation of Western Roman territories, which shaped its unique identity as a continuation of the Roman Empire in the Eastern Mediterranean.

In more detail, Byzantium carried on the traditions of the Roman Empire by maintaining Roman administrative structures, such as a bureaucracy and a hierarchical government. The Byzantine Empire also upheld Roman legal systems, including the Justinian Code, which served as a basis for Byzantine law. Furthermore, Byzantium embraced Christianity as the state religion, similar to the late Roman Empire. It played a significant role in preserving and promoting Christianity, including the establishment of the Hagia Sophia as a grand Christian cathedral.

However, Byzantium diverged from Rome in several ways. Geographically, it shifted the empire's center of power to the East, with Constantinople (formerly Byzantium) becoming the capital. This change influenced the empire's political, economic, and cultural dynamics, as it became a gateway between the East and the West. The Byzantine Empire also experienced a distinct artistic and architectural development, characterized by the extensive use of mosaics, religious iconography, and domed structures.

Another crucial divergence was the Byzantine Empire's adoption of a theocratic system. Unlike the Roman Empire, which had a secular governance structure, Byzantium blended political and religious authority, with the emperor being viewed as God's representative on Earth. This fusion of religious and political power shaped Byzantine society and governance, as well as its relations with the Church.

Furthermore, Byzantium faced different challenges than the Western Roman Empire. It confronted the rise of Islam and the Arab conquests, which led to the loss of significant territories in the Eastern Mediterranean. This struggle with Islam shaped Byzantium's military strategies, diplomatic relations, and cultural interactions. Additionally, the fall of the Western Roman Empire in 476 CE resulted in the fragmentation of Roman territories in the West, while Byzantium persisted in the East as a distinct and continuous civilization.

In summary, Byzantium continued the traditions of the Roman Empire through the preservation of administrative structures, legal systems, and Christianity. However, it diverged from Rome by shifting its political and cultural center, developing a unique artistic and architectural style, adopting a theocratic system, and facing different geopolitical challenges. These factors contributed to the establishment of Byzantium as its own distinctive civilization within the broader context of the Roman Empire.

Learn more about Roman Empire  here:

https://brainly.com/question/27985217

#SPJ11

we find the energy to be approximately \(3.41 * 10^-19\) Joules is the answer.

To calculate the wavelength of a photon with a frequency of 61.7 MHz, we can use the formula: wavelength = speed of light / frequency. The speed of light is approximately\(3 * 10^8\) meters per second.

Converting the frequency to Hz (\(1 MHz = 10^6 Hz\)), we have \(61.7 * 10^6\)Hz.

Plugging these values into the formula, we get: wavelength =\((3 * 10^8 m/s) / (61.7 * 10^6 Hz).\)

Simplifying, we find the wavelength to be approximately 4.862 meters.

Now, to calculate the energy of a photon with a wavelength of 582.8 nm, we can use the equation: energy = Planck's constant × speed of light / wavelength.

Planck's constant is approximately \(6.63 * 10^-34\) Joule-seconds.

Converting the wavelength to meters (\(1 nm = 10^-9 m\)), we have \(582.8 * 10^-9 m.\)

Plugging these values into the equation, we get: energy =\((6.63 * 10^-34J·s) * (3 * 10^8 m/s) / (582.8 * 10^-9 m).\)

Simplifying, we find the energy to be approximately \(3.41 * 10^-19\) Joules.

know more about wavelength

https://brainly.com/question/31143857

#SPJ11

Given:

Sum of masses of two isotopes = 371.9087 u

Re-185 natural abudance = 37.40%

Re-187 natural abudance = 62.60%

Known:

atomic weight of Re = 186.207 u

Atomic mass of Re-185:

To find the atomic mass of Re-185, take the total mass given and subtract atomic weight.

abundance of Re-185 = 37.40% = 0.3740

(371.9087 - x) = atomic weight of Re-187 in u

To find mass of Re-187:

abundance of Re-187 = 62.60% = 0.6260

Solution:

Step 1. Multiply x times the abundance of Re-185 and multiply (371.9087 - x) times the abundance of Re-187.

Re-185: (0.3740)(x) = 0.3740x

Re-187: (0.6260)(371.9087 - x) = 232.8148462 - 0.6260x

Step 2. Add the results and set them equal to 186.207.

0.3740x + 232.8148462 - 0.6260x = 186.207

Step 3. Solve for x by subtracting 232.8148462 from both sides and then divide both sides by -0.2520.

0.3740x + 232.8148462 - 0.6260x - 232.8148462 = 186.207 -

232.8148462

0.3740x - 0.6260x = -46.6078462

-0.2520x = -46.6078462

-0.2520x/-0.2520x = -46.6078462/-0.2520

x = 184.9517706 u

Step 4. Atomic weights of Re-185 and Re-187.

x = 185.0 u = the atomic weight of Re-185

(371.9087 - 184.9517706) = 186.9569294 = 187.0 u = the atomic weight of Re-187

Therefore the atomic weight of Re-185 is 185.0 u, and the atomic weight of Re-187 is 187.0 u.

The main difference between NaBH₄ and LiAlH₄ is their reactivity and selectivity.

NaBH₄ (sodium borohydride) and LiAlH₄ (lithium aluminum hydride) are both reducing agents commonly used in organic chemistry for the reduction of carbonyl compounds (aldehydes, ketones, esters, etc.) to alcohols.

NaBH₄ is a milder reducing agent compared to LiAlH₄, which means it is more selective in its reduction reactions and is generally used for the reduction of less reactive carbonyl compounds. On the other hand, LiAlH₄ is a stronger reducing agent and can reduce a wider range of carbonyl compounds, including more reactive compounds like carboxylic acids and nitriles.

Another difference between the two reagents is their cost and availability. NaBH₄ is more commonly used in industry due to its lower cost and ease of handling, while LiAlH₄ is more expensive and can be more difficult to handle due to its air and moisture sensitivity.

In summary, NaBH₄ is a milder and more selective reducing agent, while LiAlH₄ is a stronger and more versatile reducing agent. The choice between the two reagents depends on the specific reaction conditions and the desired selectivity and efficiency of the reduction reaction.

Learn more about reducing agents here: https://brainly.com/question/29580453

#SPJ11

The number of moles of 2 M NaOH required to titrate each solution to the equivalence point is for 45.0 mL of 9.50×10−2 M HNO3: 0.00451 moles, for 35.0 mL of 8.00×10−2 M HC2H3O2: 0.0032 moles and finally for 55.0 mL of 1.60×10−1 M HCl: 0.0088 moles.

We can use the equation: M1V1 = M2V2 to calculate the number of moles of NaOH required to titrate each solution to the equivalence point.

(a) For HNO3: M1 = 2M, V1 = X, M2 = 9.50×10−2M, V2 = 45.0mL = 0.045 L.M1V1 = M2V22X = 0.0090256X = 0.0090256/2X = 0.00451 moles

(b) For HC2H3O2: M1 = 2M, V1 = X, M2 = 8.00×10−2M, V2 = 35.0mL = 0.035 L.M1V1 = M2V22X = 0.0064X = 0.0064/2X = 0.0032 moles

(c) For HCl: M1 = 2M, V1 = X, M2 = 1.60×10−1M, V2 = 55.0mL = 0.055 L.M1V1 = M2V22X = 0.0176X = 0.0176/2X = 0.0088 moles

Therefore, the number of moles of 2 M NaOH required to titrate each solution to the equivalence point is as follows:For 45.0 mL of 9.50×10−2 M HNO3: 0.00451 moles.For 35.0 mL of 8.00×10−2 M HC2H3O2: 0.0032 moles.For 55.0 mL of 1.60×10−1 M HCl: 0.0088 moles.

Learn more on NaOH titration here: https://brainly.com/question/31115798

#SPJ11

Answer: See below

Explanation:

n of CO2​ = 0.364mmol

Mass of C = 0.364*12 = 4.368 mg

n of H2​O = 184.37​ = 0.243 mol

The compound has 2*0.243mmol of H

Mass of H = 0.486 mg

Mass of O = 10.68 − (4.368+0.486) = 5.826mg

Moles of O = 0.364

C:H:O Ratios

0.364 : 0.486 : 0.364

= 1 : 1.34 : 1

= 3 : 4 : 3

So the empirical formula is C3​H4​O3​,

Empirical formula mass

= 88= 2 × Molar mass

And the molecular formula is C6​H8​O6

The gravitational force is related to the distance between two objects because it is inversely proportional to the square of the distance.

The gravitational force refers to the attraction between two different objects due to their masses.

This force (gravitational force)  is fundamental for maintaining the distance of objects in the Universe.

In conclusion, the gravitational force is related to the distance between two objects because it is inversely proportional to the square of the distance.

Learn more about gravitational force here:

https://brainly.com/question/72250

#SPJ1

Answer:

4.0 kg

Explanation:

M = W/g = 39.2/9.8 = 4.0 kg

sorry if its wrong-

The mass number of an atom of potassium that has 20 neutrons is option C. 39

Mass number-

Mass number is the total number of protons and neutrons in the nucleus of an atom is called the mass number. It is represented by the symbol A. In other words, mass number refers to the sum of the number of protons and neutrons in the nucleus of an atom.

Atom-

Atoms are tiny particles that make up everything in the world. Everything in the world is made up of tiny particles known as atoms. An atom is the basic unit of matter. The term "atom" comes from the Greek word atomos, which means indivisible.

The basic building blocks of all matter are atoms, which are made up of three types of particles: protons, neutrons, and electrons.

In a neutral atom, the number of electrons is equal to the number of protons, thus the overall charge on the atom is zero. However, the mass number of the atom is equal to the sum of the number of protons and neutrons.

Learn more about the mass number of an atom from the given link-

https://brainly.com/question/26160840

#SPJ11

Young / Grassy

.

.

.

.

.

.

.

.

Answer:

a. young.........................

Answer:             A is the answer

Explanation:

Smoke is often generated when a hydrocarbon is burned.

What chemical process causes smoke?

A fuel and an oxidant, often atmospheric oxygen, engage in a high-temperature exothermic (heat-releasing) redox (oxygen-adding) chemical reaction during combustion that results in oxidized, frequently gaseous products in a mixture known as smoke.

What substance causes smoke?

Carbon monoxide, carbon dioxide, and particulates are present in every smoke (PM or soot). Aldehydes, acid gases, sulfur dioxide, nitrogen oxides, polycyclic aromatic hydrocarbons (PAHs), benzene, toluene, styrene, metals, and dioxins are just a few of the numerous substances that smoke may include.

Learn more about Smoke:

brainly.com/question/26187004

#SPJ4

Answer:

Mass of chemical = 50 gram

Explanation:

Given:

Volume of chemical = 5 ml

Density of chemical = 10 g/mL

Find:

Mass of chemical

Computation:

Mass of chemical = Density of chemical × Volume of chemical

Mass of chemical = 10 × 5

Mass of chemical = 50 gram

Root mean square speed is the estimation of the effect of temperature and weight on kinetic energy. The root means square speed for a mixture of helium and methane is 2. Thus, option d is correct.

Root mean square speed is the estimation of the square root of the mean value of the squared speeds of the individual gas particles in the mixture.

As it is known that,

Root mean square speed = √{3RT/M}

Where T is constant temperature and R is gas constant. The molecular mass of helium gas is 4 g/mol and of methane is 16 g/mol.

Vrms = √{3RT/M}

For helium, Vrms = √{3RT/4}

And, for methane = Vrms = √{3RT/16}

So, (Vrms,helium) / (Vrms,methane) = 4 / 2 = 2

Therefore, option d. 2 is the root-mean-square speed for the mixture.

Learn more about root-mean-square speeds here:

https://brainly.com/question/13095222

#SPJ4

Your question is incomplete, but most probably your full question was, Helium and methane gases are mixed together in a container. what is the ratio of their root-mean-square speeds, i. e. (Vrms, helium) / (Vrms, methane)?

The hormone produced in bone that regulates bone formation and also protects against diabetes mellitus is called osteocalcin. Osteocalcin is produced by osteoblasts, which are cells responsible for bone formation.

It plays a crucial role in maintaining bone health by promoting the deposition of calcium and regulating bone turnover. Additionally, osteocalcin has been found to have a protective effect against diabetes mellitus. It stimulates insulin secretion and improves insulin sensitivity, thus helping to regulate blood sugar levels. Osteocalcin also enhances glucose uptake in skeletal muscle and adipose tissue.

Overall, this hormone serves as a link between bone and metabolism, highlighting the interconnectedness of different physiological processes in the body.

To know more about osteocalcin visit:-

https://brainly.com/question/31172263

#SPJ11

Answer:

The TV signal.

Explanation: Hope this is right! :)