How are pressure units converted ?

Answer:

The metal is not gold.

Explanation:

Density (d) = mass/volume

∴ d of metal =  mass/volume = (8.7 g)/(3.2 mL) = 2.72 g/mL.

So, the metal is not gold.

Answer:

B.

Explanation:

The neutron/proton ratio for a certain element must fall within a certain range for the element to be stable. That’s why some isotopes of an element are stable and others are radioactive.

Spontaneous decay of certain elements in nature occurs because these elements have disproportionate ratios of neutrons to protons. Thus, option B is correct.

Radio active decay is a process in which unstable nuclei will convert into stable nuclei by the emission of some particles in the form of radiations.

Unstable nature of nuclei is due to the presence of inappropriate ratio of neutrons to protons inside the nucleus. So these type of molecules shows spontaneous decay to attain stability.

Hence, the reason is the disproportionate ratios of neutrons to protons. Thus, option B is correct.

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Answer:

I think it is A.

Explanation:

Hope my answer has helped you!

Answer:

[tex]\boxed{\text{Six}}[/tex]

Explanation:

Carbon is element number six, so it has six protons.

[tex]\boxed{\textbf{A neutral atom of carbon then has six electrons.}}[/tex]

Answer: Flowing Water

Explanation:

Answer: Flowing Water

Explanation:

Answer:

Substance with a nonpolar covalent bonds is [tex]Cl_2[/tex].

Explanation:

Polar covalent compound: This compound is formed when difference in electronegativity between the atoms is present. When atoms of different elements combine, it results in the formation of polar covalent bond. For Example: [tex]CO_2,NO_2[/tex] etc..

Non-polar covalent compound: This compound is formed when there is no difference in electronegativity between the atoms. When atoms of the same element combine, it results in the formation of non-polar covalent bond. For Example: [tex]N_2,O_2[/tex] etc.

Substance with a nonpolar covalent bonds is [tex]Cl_2[/tex].

Among the options, Cl2 is the only substance that contains nonpolar covalent bonds because the two chlorine atoms share the pair of electrons equally having the same electronegativity.

The substance that contains nonpolar covalent bonds among the listed options is Cl2. Nonpolar covalent bonds occur when two atoms share a pair of electrons equally, usually seen in diatomic elements or compounds with the same elements. In Cl2, two chlorine atoms share the pair of electrons equally since they have the same electronegativity, hence, it forms a nonpolar covalent bond.

On the other hand, SO3, SiO2, and CCl4 contain polar covalent bonds because the bonding electrons are not shared equally due to a difference in electronegativity of the atoms involved.

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Answer:

The silicates

Explanation:

The silicates are the most common mineral groups on the earth crust. They account for a bulk 90% of all rocks and earth materials we find on our thin crust.

The silicates are made of the fundamental unit which is the SiO₄⁴⁻ tetrahedron. This forms the basic unit through which other elements combine with them. The silicates makes up the bulk of sands we have as silica.

The tetrahedron makes silicates unique and able to combine readily with other elements to form a wide range of minerals.

Most rocks found on the earth surface and in the crust are for their most parts made up of silicate minerals. Some of these minerals are olivine, quartz, beryl, phlogopite, feldspars etc.

Answer:

C₃H₈ + 5O₂ → 3CO₂ + 4H₂O.

Explanation:

To balance the equation, you should apply the law of conservation of mass for the equations.

The law of conservation of mass states that the no. of each atom is equal in both sides (reactants and products).

Hydrocarbon is burned in oxygen to produce CO₂ and H₂O.

So, the given equation is balanced as:

C₃H₈ + 5O₂ → 3CO₂ + 4H₂O.

that 1.0 mole of C₃H₈ is burned in 5.0 moles of O₂ to produce 3.0 moles of CO₂ and 4.0 moles of H₂O.

The no. of all atoms is the same in both of reactants and products side.

C (3), O (10), and H (8).

Answer:

1. The products of this reaction are ZnCl₂ and H₃PO₄.

2. 14.57 g.

Explanation:

1. What would the products of this  reaction be?

Zn₃(PO₄)₂ + 6HCl → 3ZnCl₂ + 2H₃PO₄,

It is clear that 1.0 mol of Zn₃(PO₄)₂ reacts with 6.0 mol of HCl to produce 3.0 mol of ZnCl₂ and 2.0 mol of H₃PO₄.

So, the products of this reaction are ZnCl₂ and H₃PO₄.

2. If we produced 13.05 g of H₃PO₄, how many grams of  hydrochloric acid would be need to start with?​

n = mass/molar mass = (13.05 g)/(97.994 g/mol) = 0.1332 mol.

Using cross-multiplication:

6.0 mol of HCl needed to produce → 2.0 mol of H₃PO₄, from stichiometry.

??? mol of HCl needed to produce → 0.1332 mol of H₃PO₄.

∴ The no. of moles of HCl needed = (6.0 mol)(0.1332 mol)/(2.0 mol) = 0.3995 mol.

∴ The mass of HCl needed = n*molar mass = (0.3995 mol)(36.46 g/mol) = 14.57 g.

So, the grams of  hydrochloric acid would be need to start with = 14.57 g.

Answer:

Oh, I don't run

Explanation:

Alex Russo

Elizabeth is getting ready to run a marathon, her thinking incorrect due to lack of training and unrealistic Expectations.

Lack of Training: Marathon runners need to be properly trained and condition themselves. Elizabeth's reasoning can be flawed if she hasn't had enough training since she might underestimate the physical difficulties and the risks involved in the marathon. Without adequate training, she can experience fatigue, injuries, or other health problems while competing.

Elizabeth might have exaggerated expectations on how well she will perform in the marathon. She would be mistaken in her reasoning, for instance, if she thought she could run the marathon in a relatively short amount of time without any training or prior experience. Setting reasonable objectives that take into account one's ability and level of fitness is crucial.

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Answer:

1 Atm

Explanation:

Dalton's law

The total pressure is 3 Atm so all you have to do is subtract the other partial pressures from 3

Answer:

OB) 1.0 atm

Explanation:

we have a mixture of hydrogen, nitrogen and methane and we have the following data

[tex]P_t= 3.0 atm[/tex]

[tex]P_H=0.5atm\\P_{CH_4}=1.5 atm\\P_N=?[/tex]

According to the law of Dalton the sum of the partial pressures of each gas is equal to the total pressure

Total pressure equation

[tex]P_t=P_H+P_{CH_4}+P_N[/tex]

now we clear the partial pressure of nitrogen from the equation

[tex]P_t=P_H+P_{CH_4}+P_N\\P_t-P_H-P_{CH_4}=P_N\\3amt-0.5atm-1.5atm=P_N\\1atm=P_N[/tex]

the partial pressure of nitrogen is 1 atm

the correct answer is OB) 1.0 atm

Paraffins are the simplest homologous series, where the difference between each member of the series is a simple structural unit.

C. Homologous

It is also referred to as alkanes, are saturated compounds that have the general formula [tex]C_nH_{2n+2}[/tex], where n is the number of carbon atoms. The simplest alkane is methane ([tex]CH_4[/tex]), which is also represented as C-1. Normal paraffins are unbranched straight-chain molecules. It could be the number of monomers in a homo-polymer such as amylose.

Thus, correct option is C.

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Great Question! i'm going to break this down first. So the earth spins on its pole which is called the axis and every 24 hours the earth makes a full rotation on it. Remember, the sun and the moon don't move around our planet. We get our light and darkness because the Earth spins and when it does, the moon is on one side and the sun is on the other. Let's get back to your question. "Why Do We Need Timezones?" We need them because if all the people on Earth set the clocks to the same time, noon would be the middle of the day in some places but in other places, it would be morning evening and the middle of the night. Since different parts of our Earth enter and exit daylight we need different timezones. That is why we have 24 time zones on planet Earth.

Answer:

The fraction remaining of a sample that is 5 half lives old is 0.03125.

Explanation:

So, it will decay as:

1.0 → (first half life) 0.5 → (second half-life) 0.25 → (third half-life) 0.125 → (fourth half-life) 0.0625 → (fifth half-life) 0.03125.

So, the rraction remaining of a sample that is 5 half lives old is 0.03125.

Strong chemical bonds are the intramolecular forces that hold atoms together in molecules. A strong chemical bond is formed from the transfer or sharing of electrons between atomic centers and relies on the electrostatic attraction between the protons in nuclei and the electrons in the orbitals.

mark me brainliest please!

The atoms are primarily held together by strong nuclear forces and electromagnetism. The strong nuclear force binds the particles in the nucleus, while electromagnetism acts on a larger scale, holding atoms together, especially in covalent bonds. Other forces like dispersion forces also play a role when molecules are very close.

Atoms are held together by a few different forces, with the main two being the strong nuclear force and electromagnetism. The strong nuclear force keeps the particles of the nucleus, the nucleons, tightly bound together. This force is very strong, but it falls to zero over a distance of only 10-¹5 meters.

On the other hand, electromagnetism, which includes both magnetic and electrical forces, holds the atoms together at a larger scale. These forces occur between the positive charge of the atomic nucleus and the negatively charged electrons surrounding it. This is especially evident in covalent bonds where pairs of atoms share electrons.

Another type of force, although weaker, are dispersion forces that develop between atoms in different molecules when the molecules are very close.

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Answer:

Native Elements; Metallic Elements

Explanation:

Ultrasound is sound or vibrations, having an ultrasonic frequency, particularly as used in medical imaging. Ultrasound is more commonly used in medical terminology than in industry. Infrasound is sound waves with frequencies below the lower limit of human audibility.

Answer:

It can conduct electricity when dissolved

Explanation:

Final answer:

A substance is classified as an electrolyte if it dissolves in water to produce a solution that can conduct electricity due to the presence of ions. Strong electrolytes dissociate completely, whereas weak electrolytes only partially dissociate.

Explanation:

A substance is classified as an electrolyte because it produces electrically conducting solution when dissolved in water or another polar solvent. Such substances undergo either a physical or a chemical change that yields ions in solution, which are then able to move and conduct electricity. Nonelectrolytes, on the other hand, do not yield ions when dissolved.

There are also distinctions between strong electrolytes and weak electrolytes. A strong electrolyte dissociates completely into ions, leading to high conductivity, whereas a weak electrolyte only partially dissociates, resulting in lower conductivity. Thus, the strength of electrolytes is related to the efficiency of the ion-producing process when the substance is dissolved in a solvent like water.

1. The simplest alkane is the gas methane, whose molecular formula is CH4. Methane exists as a tetrahedral shape, but it is often represented by a flattened structure as are most organic compounds.

Two four-carbon alkanes are known, and they have measurably different chemical and physical properties.  Their structures are H3CCH2CH2CH3 and H3CCH(CH3)2.  Therefore they were named normal butane, often abbreviated as n-butane, and isobutane.  The straight-chain form is considered the "normal" form.  Alternatively, they could be named using the systematic IUPAC method as 1-methylpropane and 2-methylpropane, or even as butane and 2-methylpropane.  The IUPAC method names the longest straight carbon chain in the usual way and then numbers the carbons; the location of a substituent group is given by the number of its carbon.  The IUPAC method is always used for more complicated molecules, but many of the simpler ones still use non-systematic names, called trivial names, because these are less cumbersome to use.

2 . Unsaturated hydrocarbons are hydrocarbons that have double or triple covalent bonds between adjacent carbon atoms. The term "unsaturated" means more hydrogen atoms may added to the hydrocarbon to make it saturated: consisting all single bonds.

Dont know 3. Sorry!

Answer:

insulators

Explanation:

Insulators are meant to stop the conduction of electricity using materials that are non-conductive, like rubber, glass, or cable covers.

Answer:

The right choice is → a reduction reaction

Explanation:

From the balanced equation

we can calculate the change in oxidation number of Cl in reactant and product

in reactant ClO⁻

let x= oxidation number of Cl

and oxidation number of oxygen in its compound is (-2)

and the total charge on the ClO⁻ ion = -1

in product Cl⁻

let x= oxidation number of Cl

and the total charge on the Cl⁻ ion = -1

so the oxidation number of Cl decreases from +1 in reactant to -1 in product so it is reduction reaction.

But, disproportionation reaction is defined as the chemical reaction in which a single substance gets reduced as well as oxidized.

For a disproportionated substance  , it should contain at least three oxidation states. which isn't the case here.

So, the right choice is:

→ a reduction reaction

Answer:

disproportionation reaction

Explanation:

Answer:

1. Equilibrium shifts to (lift side) produce more reactant.

2. Exothermic reaction, Equilibrium shifts to (lift side) produce more reactant.

3. Increasing the pressure will shift the reaction to the side with lower moles of gas (right side).

4. Le Châtelier's principle states that when there is an dynamic equilibrium, and this equilibrium is disturbed by an external factor, the equilibrium will be shifted in the direction that can cancel the effect of the external factor to reattain the equilibrium.

Explanation:

1. How will the equilibrium be affected by adding more of the product?

This will increase the concentration of the products side, so the reaction will be shifted to the lift side (reactants side) to suppress the increase in the concentration of Products.

So, the right choice is: Equilibrium shifts to produce more reactant.

2. Is the reaction endothermic or exothermic? How will the equilibrium be affected by adding heat?

Since the sign of ΔH is negative, the reaction is exothermic reaction.

The reaction can be represented as:

PCl₃ (g) + Cl₂ (g) ↔ PCl₅ (g) + heat.

Adding heat:

Adding heat is like adding more product to the reaction, so the reaction will be shifted to the lift side (reactants side) to suppress the effect of adding heat.

So, the right choice is: Equilibrium shifts to the lift side (produce more reactant).

3. How will the equilibrium be affected by increasing the pressure on the closed system?

When there is an increase in pressure, the equilibrium will shift towards the side with fewer moles of gas of the reaction. And when there is a decrease in pressure, the equilibrium will shift towards the side with more moles of gas of the reaction.

So, increasing the pressure will shift the reaction to the side with lower moles of gas (right side).

4. Explain the principle that you used in determining how the equilibrium is affected.  

Answer:

None of the above.

Explanation:

The limiting factor of this  is the chlorine. You only have 2 moles of chlorine.

2Na + Cl_2 ==> 2*NaCl

The equation tells you that for every mol of Cl2 that you have, you require 2 moles of Na and you get 2 moles of NaCl

So what that means is that if you have 2 mols of Cl2, you need just 4 moles of Na, and you will get 4 mols of NaCl

Since 4 is not one of your choices, the answer is none of the above

Answer:

The whale shark's teeth are an example of vestigial structures. If an inherited feature is no longer needed but also not harmful, there's no evolutionary pressure to get rid of it.- A.

Answer:

The correct answer is option A, that is, the whale shark's teeth are an example of vestigial structures. If an inherited feature is no longer needed but also not harmful, there's no evolutionary pressure to get rid of it.

Explanation:

The vestigial structures refer to the compositions, which exhibit no ostensible activity and seems to be the leftover components from a past ancestor. Some of the examples of vestigial parts are the pelvic bone of a snake, the human appendix, and the wings of flightless birds.

Answer:

[tex]CaF_{2}[/tex]

Explanation:

Calcium = Ca

Fluorine = F

Answer:

CaF2

Explanation:

Neon has atomic mass of 20

Answer:

they are right its neon but i have the same questions so just search up "neon bohr modle" so you know which answer it is.

Explanation:

Answer:

[tex]\boxed{2000}[/tex]

Explanation:

[tex]\text{4 quarters = \$1}\\\\\text{No. of quarters} = \text{\$500} \times \dfrac{\text{4 quarters}}{\text{\$1}} = \boxed{\textbf{2000 quarters}}[/tex]

Answer:  The correct answer is:  [B]:

_________________________________________________

                         " organic acid and amines " .

_________________________________________________

Note:  Choice B:  "organic acid and amines" ;

            is the only answer choice that contains "amines" (hint: amino acid / amine) ;  which are "proteins" .

           As such;  Choice "B" is the only  correct answer choice.

_____________________________________________________

Hope this helps!

    Best wishes to you!

_____________________________________________________

Answer: option B

Explanation:

Amino acids have both COOH and NH2 groups.

Example, Glycine -NH2CH2COOH

Hence amino acids are the combination of organic acids and amine.

Amino acids are building blocks of proteins.

it wouldnt have an effect?

Answer:

There are several theories to the extinction of the dinosaurs. One of the most supported ones are the impact of a meteor near Mexico that caused ashes to enter the atmosphere. These ashes led to a decrease in global temperature since it prevented sunlight from entering. There are many different minor theories that aren't as backed up as the meteor one.

About 65.5 million years ago was the start of the end of the age of the dinosaur. We know now that there was a meteor strike that happened 65.5 million years ago in Latin America and most scientists believe that or that plus a few other things is was initiated the collapse of the age of the dinosaur and initiated the rise of mammals which then leads to us. So 65.5 million years ago, there was an extinction event which scientists believe it was a meteor.

It most likely didn't kill all the dinosaurs immediately. It most likely altered the atmosphere and possibly caused a couple thousand years of a nuclear winter where the sun was blocked out if you can imagine that in your head.

The meteor was about 6 miles wide which doesn't sound like a lot to cause a mass extinction like this but it happened. So that large object striking the earth caused this havoc.

We know when this happened and where it happened.

Years ago, geologists started to notice that there was a thin layer almost like a layer of icing that existed in the same age all over the earth. Now, there is an element called iridium and it doesn't exist on earth. It only exists in outer space and so it had to be brought here and the thought is that this meteor mainly added this element and when it hit, it dispersed and it left this layer all over our planet so it's almost a fingerprint. So we know that this layer exists at 65 million years everywhere on earth and that's associated with this meteor.

The meteor hit in Latin America. The Gulf of Mexico is a meteor crater and that's where it hit and it hit about half on land and half in water.

If that didn't happen, there is a highly likelihood that dinosaurs would still be here. There is no reason why they wouldn't be and they would have evolved in any way they could have evolved in 65 million years and would still be here. However, mammals wouldn't be here.