You are given the balanced equation:

Zn(NO3)2 (aq) + Na2S (aq) ----> ZnS (s) + X

What is correct formula for the product represented by X?

A. Na2(NO3)2 (s)
B. Na2NO3 (s)
C. NaNO3 (aq)
D. 2 NaNO3 (aq)

B.

One mole of any element or compound contains 6.02x10^23 particles (atoms or molecules)

One mole of a compound has 6.02x10^23 molecules

One mole of an element has 6.02x10^23 atoms

Therefore, 2 moles would have the double of 6.02x10^23 atoms

Answer:

Mega- 10^6

Kilo-10^3

Hecto- 10^2

Deca-10^1

Deci-10^-1

Centi-10^-2

Milli-10^-3

Micro-10^-6

All are metric system units

The correct matching of prefixes with the powers of ten they represent is as follows:

1. mega - [tex]\(10^6\)[/tex]

2. kilo - [tex]\(10^3\)[/tex]

3. hecto - [tex]\(10^2\)[/tex]

4. deka - [tex]\(10^1\)[/tex]

5. deci - [tex]\(10^{-1}\)[/tex]

6. centi - [tex]\(10^{-2}\)[/tex]

7. milli - [tex]\(10^{-3}\)[/tex]

8. micro -[tex]\(10^{-6}\)[/tex]

 The metric system uses prefixes to denote powers of ten. Here is the explanation for each prefix:

 1. Mega (M) is a prefix that stands for one million times the base unit, hence [tex]\(10^6\).[/tex]

2. Kilo (k) is a prefix that stands for one thousand times the base unit, hence [tex]\(10^3\).[/tex]

3. Hecto (h) is a prefix that stands for one hundred times the base unit, hence [tex]\(10^2\).[/tex]

4. Deka (da) is a prefix that stands for ten times the base unit, hence \[tex](10^1\).[/tex]

5. Deci (d) is a prefix that stands for one-tenth of the base unit, hence \[tex](10^{-1}\).[/tex]

6. Centi (c) is a prefix that stands for one-hundredth of the base unit, hence [tex]\(10^{-2}\).[/tex]

7. Milli (m) is a prefix that stands for one-thousandth of the base unit, hence [tex]\(10^{-3}\).[/tex]

8. Micro (µ) is a prefix that stands for one-millionth of the base unit, hence [tex]\(10^{-6}\).[/tex]

 The powers of ten are used to express very large or very small numbers concisely. Each prefix represents a specific multiple or fraction of the base unit. For example, a millimeter (mm) is one-thousandth of a meter, and a kilogram (kg) is one thousand times the mass of a gram.

The correct answer really is B.

If you are directed to break that rule then you better be in a high level chemistry class. When I taught things like that I insisted that students just wait until the chemical permeated the fume cabinet and even then I was always very nervous.

Sometimes you have to know when to ignore a bad direction. If you are working with chlorine, for example, you should be especially careful. That stuff was used in WWI as part of a chemical warfare technique. Many men suffered grotesque deaths by breathing it in, particularly if they were in trenches. Chlorine is heavier than air. It sinks to the lowest level.

Answer: 0.161 atm

Explanation:

To calculate the partial pressure of helium (He), use the equation PHe = XHe × Ptotal, where XHe is the mole fraction of He, and Ptotal is the total pressure given in the question.

To calculate the mole fraction of helium, we must first calculate the number of moles of helium and hydrogen gas in the mixture.

nHe = 1.00g He/ 4.003 g/mol = 0.2498 mol

nH2 = 1.00g H2 / 2.016 g/mol = 0.4960 mol

ntotal= 0.2498 mol + 0.4960 mol= 0.7458 mol

We can now solve for the partial pressure of helium as follows. Recall that the mole fraction of helium is the ratio of the moles of helium to the total number of moles of gas.

PHe = XHe × Ptotal

= nHe / ntotal × Ptotal

= 90.2498 mol / 0.7458 mol) × 0.480atm

= 0.1608

Therefore, after rounding the answer to two significant figures, we find that the partial pressure of helium gas is about 0.161 atm.

The partial pressure of helium (He) in the mixture containing 1 g of H₂ and 1 g of He is 0.16 atm

We'll begin by calculating the number of mole of each gas present in the mixture.

Mass of H₂ = 1 g

Molar mass of H₂ = 2 × 1 = 2 g/mol

Mole = mass / molar mass

Mole of H₂ = 1/2

Mass of He = 1 g

Molar mass of He = 4 g/mol

Mole = mass / molar mass

Mole of He = 1/4

Next, we shall determine the total mole.

Mole of H₂ = 0.5 mole

Mole of He = 0.25 mole

Total mole = 0.5 + 0.25

Next, we shall determine the mole fraction of He.

Mole of He = 0.25 mole

Total mole = 0.75 mole

Mole fraction of He =.?

Mole fraction = mole / total mole

Mole fraction of He = 0.25 / 0.75

Finally, we shall determine the partial pressure of He.

Mole fraction of He = 0.33

Total pressure = 0.48 atm

Partial pressure = mole fraction × total pressure

Partial pressure of He = 0.33 × 0.48

Partial pressure of He = 0.16 atm

Therefore, the partial pressure of helium (He) in the mixture is 0.16 atm

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Answer:

Carbohydrates

Explanation:

Did the test and got it right

Answer: D) 2.82

Reasoning: There are 35.453 grams in a single mole.

So divide 100 by 35.453

100/35.453=2.82063577

Rounded 2.82063577 equals 2.82

There are 2.82 moles of chlorine in the 100 gram of chlorine. A mole is a unit of measurement that is used for very tiny particles such as atoms, ions, and molecules.

The number of moles can be calculated by the formula,

[tex]n = \dfrac wm[/tex]

Where,

[tex]n[/tex]- number of moles

[tex]w[/tex] - given mass of chlorine

[tex]m[/tex] - molar mass of the chlorine

Put the values in the formula,

[tex]n = \dfrac {100}{35.45}\\\\n = 2.82 \rm \ g[/tex]

Therefore, there are 2.82 moles of chlorine in the 100 gram of chlorine.

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Answer:

A.  PBr5

Explanation:

To write the formulas for a compound, first identify what the elements used are.

In phosphorus pentabromide, the elements are phosphorus and bromine (bromine => bromide in a compound name). Find these symbols on your periodic table.

Phosphorus = P

Bromine = Br

Write them one after the other:

PBr

Then, determine the number of each atom, which will be written as a subscript. The word penta is the greek prefix meaning 5. Since it's attached to "bromide", there are 5 bromine atoms.

PBr₅

The formula for the binary covalent compound phosphorus pentabromide is PBr5. This is due to the 'penta' prefix indicating five atoms of bromine and one atom of phosphorus.

The correct formula for the binary covalent compound phosphorus pentabromide is PBr5. The prefix 'penta' indicates five, so pentabromide implies there are 5 bromine (Br) atoms. Phosphorus (P), in this case, does not have a prefix, which means there is one phosphorus atom. Therefore, combining one atom of phosphorus with five atoms of bromine gives us PBr5.

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Atlantic

Hope I helped thanksss

Answer:

Atlantic has spread during this time

Explanation:

because South America , North America, and Australia separated from antarctica

Explanation:

There are three states of matter:

1) Solid: In this state, the particles lie closer to each other. there is a strong intermolecular force of attraction between the particles.

2) Liquid: In this state, the particles are at a certain distance to each other. There is an intermediate intermolecular force of attraction between the particles.

3) Gas: In this state, the particles are farther from each other. There is weaker  intermolecular force of attraction between the particles.

As the number of carbon atoms in a molecule increases, the number of particles increases and the particles will come closer to each other. Hence, the state of matter will shift towards the solid state.

Viscosity is defined as the tendency to resist the particles to flow. As, the number of carbon atoms increases, the Vander-Walls forces increases, the particles are closer to each other and Hence, the viscosity will increase.

Ag with a superscript of 107 and a subscript of 47

The silver (Ag) isotope with 60 neutrons has the chemical symbol: [tex] ^{107}_{47}X [/tex].  

Any isotope can be represented as follows:

[tex] ^{A}_{Z}X [/tex]

Where:

Z: is the atomic number = number of protons

A: is the mass number

The atomic number of Silver is 47, so:

[tex] ^{A}_{47}X [/tex]

Now, we need to find the mass number:

[tex] A = Z + n [/tex]

Where:

n: is the number of neutrons = 60

[tex] A = Z + n = 47 + 60 = 107 [/tex]

Therefore, the chemical symbol of Ag-47 is [tex] ^{107}_{47}X [/tex].  

You can find more about isotopes here:

I hope it helps you!

Answer is: John Dalton proposed that matter is made of tiny particles.

Proust's law or law of constant composition said that a given chemical compound always contains its component elements in fixed ratio and does not depend on method of preparation.

Water (H₂O) is made of two hydrogen atoms and one oxygen atom:

m(H) : m(O) = 2·1 : 16 = 1: 8.

Dalton said that matter is composed of atoms and atoms of different elements can join to form chemical compound.

Answer:

Mendeleev

Explanation:

The lines around the finger of the doorknob represent the electric force on the charged objects.

Answer:

Ionic

Explanation:

Step 1: Define

1s²2s¹ is Lithium (Li)

1s²2s²2p⁵ is Chlorine (Cl)

Step 2: RxN

2Li (s) + Cl₂ (g) → 2LiCl (s)

Step 3: Identify

LiCl is a metal and a non-metal bonded together. Therefore, it will be an ionic bond. The Lithium would transfer it's electron to Chlorine (since it wants a full outer shell 0f 8 and it currently as 7) and form a salt.

Answer:

16 mol

Step-by-step explanation:

N₂ + 3H₂ ⟶ 2NH₃

You want to convert moles of N₂ to moles of NH₃.

The molar ratio is 2 mol NH₃:1 mol N₂.

Moles of Br₂ = 8 × 2/1

Moles of Br₂ = 16 mol NH₃

You will have 16 mol NH₃ when the reaction is finished.

Answer: A) Nonmetal carbon shares valence electrons with each nonmetal chlorine forming four covalent bonds.

Explanation: Carbon has atomic no 6. It has 4 valence electrons. It can only share electrons as it is difficult to gain or lose 4 electrons to complete it's octet.

Chlorine has atomic no 17 . It has 7 valence electrons and need one electron to complete its octet.

Thus carbon will share 4 electrons, one each with four chlorine atoms to form carbon tetra chloride.

Covalent bond is formed by sharing of electrons whereas Ionic bond is formed by transfer of electrons between atoms.

Answer:

its A

Explanation:

did it on usa test prep

It would be A bc carbon is NOT usually a product. You can find out more about the by searching combustion reactions, then u should be able to answer the questions on your own.

Answer: The correct answer is Option a.

Explanation:

Combustion reaction is defined as the reaction in which a hydrocarbon reacts with oxygen gas to produce carbon dioxide gas and water molecule. It is considered as an exothermic reaction as energy is released during these reactions.

A hydrocarbon is a substance which contains a covalent bond between a hydrogen and carbon atoms. So, it is considered as a carbon-fuel compound.

The general equation for this reaction follows:

[tex]\text{hydrocarbon}+O_2(g)\rightarrow CO_2(g)+H_2O(g)+\text{heat}[/tex]

From the above equation, it is visible that elemental carbon is not produced.

Hence, the correct answer is Option a.

FeCO3  ==> Fe + produsi minoritari.

m Fe impur= 700 kg

puritatea (p) = masa pura (mp)/ masa impura (mi) x 100

mp= p x mi / 100 sau mp = p/100 x mi => mp Fe = 90/100 x 700 = 630 kg Fe pur.

M FeCO3= 115.85 kg/kmol

115.85 kg FeCO3 .... 55.85 kg Fe

     x kg FeCO3  ........630 kg Fe

x= 630 * 115.85 /55.85 = 1306.81 kg FeCO3 (mp in formula puritatii)

p=mp/mi x 100

mi FeCO3 = 1500 kg

mp FeCO3=1306.81 kg

p=1306.81 / 1500 x 100 = 87.12% puritate Siderit

Answer:

It has 12.84% of impurity

Explanation:

You obtained 700 kg 90% purity of Fe, so you have:

[tex]m_{Fe}=700 kg*0.9=630kg[/tex]

Those 630 kg are the mass of Fe contained in the original sample of 1500 kg in the from of Siderit.

The other substeances that aren't Siderit in the sample can be considered impurities.

Siderit: [tex]FeCO_3[/tex]

[tex]M_{siderit}=115.8 kg/kmol[/tex]

[tex]M_{Fe}=55.8 kg/kmol[/tex]

The mass of siderit:

[tex]m=630 kg Fe*\frac{115.8 kg Siderit}{55.8 kg Fe}=1307.4 kg Siderit[/tex]

[tex]m_{impurities}=1500kg-1307.4kg=192.6kg[/tex]

Percentaje of impurity:

[tex]P=\frac{192.6kg}{1500kg}*100=12.84[/tex]

Answer: 1.94 kg

Explanation: Given : [tex]MgF_2\rightarrow Mg+F_2[/tex]

Sample 1 produces 1.65 kg of Mg and 2.58 kg of [tex]F_2[/tex].

As every chemical reaction follows law of conservation of mass, which says that the mass of products must be equal to the mass of reactants.

Thus mass of [tex]MgF_2[/tex] should be 1.65+2.58 kg = 4.23 kg

1.65 kg of Mg was produced by 4.23 kg of [tex]MgF_2[/tex]

Now the second sample produces 1.24 kg of Mg.

1.24 kg of Mg will be produced by=[tex]\frac{4.23}{1.65}\times {1.24}=3.18 kg[/tex]

Now again law of conservation of mass is to be followed so mass of [tex]F_2[/tex] will be= mass of [tex]MgF_2[/tex] - mass of [tex]Mg[/tex]

=(3.18 kg -1.24 kg)  = 1.94 kg

the answer is A: The Gold Foil experiment

Answer: A. Gold foil experiment

Explanation:

Ernest Rutherford discovered the nucleus in 1911 from the results he obtained in several experiments in which he bombarded a thin sheet of gold with alpha particles (a sub-microscopic particle with a positive charge) from a radioactive element.  

Rutherford observed, by means of a fluorescent screen, to what extent the particles with which he bombarded the sheet were scattered. Most of them traversed the metal sheet without changing direction; however, a few were reflected backwards with small angles.  

Using a mathematical analysis of the forces involved, Rutherford showed that the scattering was caused by a small positively charged nucleus, located in the center of the gold atom. In this way, he deduced that most of the atom is empty space and discovered the atomic nucleus.

(a) The molecular shapes of cis and Trans forms of N2F2 are-

b) There is EN difference between N atom and F atom. Hence the molecule will have a bond dipole.

In Cis form two fluorine atoms are on the same side of N N bond. Hence, bond moment in N2F2 cis form) do not cancel each other. Thus the cis form is polar.

In the trans form two fluorine atoms are on the opposite side of N-N bond. Bond moment of NF cancels each other.

Thus: trans N2F2 is non polar molecule.

Answer:

(a) The molecular shapes of cis and Trans forms of N2F2 are-

b) There is EN difference between N atom and F atom. Hence the molecule will have a bond dipole.

In Cis form two fluorine atoms are on the same side of N N bond. Hence, bond moment in N2F2 cis form) do not cancel each other. Thus the cis form is polar.

In the trans form two fluorine atoms are on the opposite side of N-N bond. Bond moment of NF cancels each other.

Thus: trans N2F2 is non polar molecule.

In an I2 molecule, the 5p atomic orbitals of iodine atoms overlap to form the covalent bond. The I2 molecule has an electron configuration analogous to Xenon.

In the diatomic I2 molecule, the 5p atomic orbitals of each iodine atom overlap to form the covalent bond. As per the electron configuration, an iodine atom has 7 electrons in its outermost 5p orbital. When these combine with another iodine atom, they share 1 electron each, for a total of 8 electrons. This corresponds to the electron configuration of the noble gas Xe (Xenon). Therefore, each iodine atom in an I2 molecule has an electron configuration analogous to Xenon.

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In I2 molecule formation, the 5p orbitals overlap. Each Iodine atom ends up with a total of 54 electrons. This configuration is analogous to the noble gas Xenon (Xe).

In the formation of I2 molecule, the 5p atomic orbitals overlap, similar to the 2p orbitals that overlap in the formation of F2 molecule. When the atomic orbitals of the two iodine atoms overlap and combine, each iodine atom shares one electron with the other, which gives each iodine atom in the I2 molecule a total of 54 electrons. When we look at the periodic table, we can see that the noble gas Xenon (Xe) has 54 electrons. Therefore, each iodine atom in the I2 molecule has an electron configuration analogous to that of xenon (Xe).

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The correct answer is option D, that is, two new compounds.

Double displacement also known as double replacement reactions, metathesis or exchange reactions. It take place when two ionic compounds are exchanged forming two new compounds. One can consider the reaction as swapping the anions or the cations.

Water usually functions as the solvent for a double replacement reaction, and the products and reactants are generally ionic compounds, however, they can also be bases or acids. The example of a double replacement reaction is:

BaCl₂ (aq) + Na₂SO₄ (aq) = BaSO₄ (s) + 2NaCl (aq)

In this, the cations are Na⁺ and Ba²⁺, and the anions are SO₄²⁻ and Cl⁻. If the anions or cations are swapped, the products obtained are BaSO₄ and NaCl.

In a double-displacement reaction, two ionic compounds exchange ions in aqueous solution to form two new compounds, often resulting in a precipitate, a gas, or a molecular compound. The correct answer to the given question is option  D, two new compounds.

In a double-displacement reaction, two compounds exchange ions to form two new compounds. This typically happens between two ionic compounds in aqueous solution.

The most common outcomes of such reactions are the formation of a solid precipitate, a gas, or a molecular compound like water. The correct answer to what is produced in a double-displacement reaction is D, two new compounds.

An example would be mixing aqueous solutions of potassium iodide (KI) and lead (II) nitrate (Pb(NO₃)₂), resulting in the formation of lead (II) iodide (PbI₂), a precipitate, and potassium nitrate (KNO₃), which remains in solution. This occurs because the lead (II) iodide that is formed is insoluble in water and precipitates out, signifying a successful reaction.

4 moles of hydrogen  = 4 * 1.008 = 4.032 grams

1 mole of helium = 4.003 grams

Difference is  4.032 - 4.003

= 0.029 g

Answer:

The correct answer is option B.

Explanation:

The atomic mass of hydrogen-1 = 1.008 g/mol

The atomic mass of helium-4 = 4.003 g/mol

Mass of 4 mole of hydrogen = 4 × 1.008 g/mol = 4.032 g

Mass of 1 mole of helium = 1 × 4.003 g/mol = 4.003 g

Difference of between 4 moles of hydrogen and 1 moles of helium :

4.032 g - 4.003 g = 0.029 g

Answer : Two electrons balances the charges in this half reaction.

Explanation :

The given half reaction is,

[tex]SO_2+2H_2O\rightarrow SO^{2-}_4+4H^+[/tex]

In this half reaction, there is no charges present on the left side of the reaction but on right side of the reaction, (2+) charge is present. So, two electrons (2-) are added on the right side of the reaction for balances the charge of the half reaction.

The balanced half reaction is,

[tex]SO_2+2H_2O\rightarrow SO^{2-}_4+4H^++2e^-[/tex]

Hence, two electrons balances the charges in this half reaction.

Acetylcholine binds to its receptor in the sarcolemma and triggers B. The opening of ligand-gated cation channels.

Acetylcholine refers to an organic chemical that functions in the brain. It's typically a chemical message that's released by the nerve cells in order to send signals to the other cells like the muscles cells, neurons, etc.

When acetylcholine binds to its receptor in the sarcolemma, this lead to the triggering of the opening of ligand-gated cation channels. These is vital for controlling synaptic transmission between the neurons.

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Answer: The correct answer is option d.

Explanation: Energy stored into gasoline is converted into another form of energy. This was very well explained on the basis of Law of conservation of energy. This law states that energy is conserved in the system which means that energy is converted from one form to another form.

The energy stored into gasoline is converted into mechanical energy which helps the car to move and some of the energy is lost in the form of heat.

Hence, the correct answer is Option d.

The energy stored in gasoline is converted into mechanical energy and heat when the car runs, adhering to the conservation of energy law. Option d is correct.

When a car runs out of gasoline, the energy stored in the gasoline is not destroyed or converted into matter, nor is it transferred to the roadway in a straightforward manner. Instead, the chemical potential energy stored within the molecular bonds of the gasoline is converted through combustion into mechanical energy and heat.

This process is known as an energy conversion and is a practical example of the law of conservation of energy, which states that energy cannot be created or destroyed but only changed from one form to another. In a car's engine, the combustion of gasoline causes the gaseous products to expand rapidly, pushing the pistons, thus generating mechanical energy that propels the car forward. Simultaneously, heat is produced, part of which is used to do work while the rest is dissipated into the environment.

Kinetic energy is defined as the energy the object possess due to its motion. It is the work that accelerates a given body from rest to motion.

Given:

The mass of the canoe is 23 kilogram

The velocity of the canoe is 3 m/s

The kinetic energy can be given by the formula:

KE = [tex]\frac{1}{2}.m.v^{2}[/tex]

Substituting the given values in the kinetic energy equation

KE =[tex]\frac{1}{2}.(23kg).(3m/s)^{2}[/tex]

KE= 11.5 * 9 kg.m^2/s^2

k = 103.5 J

Therefore the kinetic energy of the canoe is 103.5 Joules.

Answer: 466.67 ml

Explanation:

Boyle's Law: This law states that pressure is inversely proportional to the volume of the gas at constant temperature and number of moles.

[tex]P\propto \frac{1}{V}[/tex]   (At constant temperature and number of moles)

Thus

[tex]P_1V_1=P_2V_2[/tex]  [according to Boyle's law]

[tex]742torr\times 500ml=795torr\times V_2[/tex]

[tex]V_2=466.67ml[/tex]

Answer : The volume of [tex]CO_2[/tex] will be 0.4665 L

Solution : Given,

Initial volume = 500 ml = 0.5 L         (1 L = 1000 ml)

Initial pressure = 742 torr = [tex]\frac{742}{760}=0.976atm[/tex]    [tex](1atm=760torr)[/tex]

Final pressure = 795 torr = [tex]\frac{795}{760}=1.046atm[/tex]

According to the Boyle's law, the pressure of the gas is inversely proportional to the volume of the gas at constant temperature.

[tex]P\propto \frac{1}{V}[/tex]

or,  [tex]\frac{P_1}{P_2}=\frac{V_2}{V_1}[/tex]

where,

[tex]P_1[/tex] = initial pressure of the gas

[tex]P_2[/tex] = final pressure of the gas

[tex]V_1[/tex] = initial volume of the gas

[tex]V_2[/tex] = final volume of the gas

Now put all the given values in the above formula, we get

[tex]\frac{P_1}{P_2}=\frac{V_2}{V_1}[/tex]

[tex]\frac{0.976atm}{1.046atm}=\frac{V_2}{0.5L}[/tex]

By rearranging the terms, we get the final volume of the gas.

[tex]V_2=0.4665L[/tex]

Therefore, the volume of [tex]CO_2[/tex] will be 0.4665 L

Answer: atmospheric movements

Explanation: The weather in a particular location is influenced by atmospheric movements. The movements and interactions of warm and cold air masses. The type of interaction, the speed of the movements, and the area where the interaction occur can impact the type of weather produced.