What is a material that you cannot see through called?

Answer:

Explanation:

The density of a substance can be found by using the formula

\(Density = \frac{mass}{volume} \)

From the question

mass = 30.8 g

volume = 34.9 cm³

Substitute the values into the above formula and solve

That's

\(Density = \frac{30.8}{34 .9} \\ = 0.8825\)

We have the final answer as

Hope this helps you

Answer:

Noble gases

Explanation:

Noble gases have filled electron shells (group 18=8 electrons) and are all odorless, colorless, monatomic gases with very low chemical reactivity.

55.03 moles of KCI are produced when 6743 grams of \(KClO_{3}\) decomposes

To determine the number of moles of KCl produced when 6743 grams of \(KClO_{3}\) decomposes, we need to use the concept of molar mass and the balanced chemical equation.

First, let's calculate the molar mass of \(KClO_{3}\)

The molar mass of potassium (K) is approximately 39.10 g/mol.

The molar mass of chlorine (Cl) is approximately 35.45 g/mol.

The molar mass of oxygen (O) is approximately 16.00 g/mol.

So, the molar mass of \(KClO_{3}\) is:

(39.10 g/mol) + (35.45 g/mol) + (3 * 16.00 g/mol) = 122.55 g/mol.

Now, we need to calculate the number of moles of \(KClO_{3}\):

Number of moles = Mass / Molar mass

Number of moles = 6743 g / 122.55 g/mol = 55.03 mol.

According to the balanced chemical equation:

2\(KClO_{3}\) -> 2 KCl + 3 O2,

we can see that for every 2 moles of \(KClO_{3}\), we obtain 2 moles of KCl.

Therefore, the number of moles of KCl produced will be equal to the number of moles of \(KClO_{3}\) since the ratio is 1:1. Thus, 55.03 moles of KCl will be produced.

Know more about molar mass here:

https://brainly.com/question/837939

#SPJ11

When an equilibrium system is put under stress, Le Chatelier's principle may constitute used to forecast changes in equilibrium concentrations.

A rule that states that if a system is in equilibrium and a constraint is given to it (such as a change within pressure, temperature, or reactant concentration), the equilibrium will shift and tend to compensate for the effect caused by the constraint. This is  Le Chatelier's principle.

When an equilibrium system is put under stress, Le Chatelier's principle may constitute used to forecast changes in equilibrium concentrations. However, the adjustments required to reach equilibrium might not be as evident if we have a combination of reactants and byproducts that are still not at equilibrium.

To know more about Le Chatelier's principle, here:

https://brainly.com/question/29009512

#SPJ1

Answer:

True

Explanation:

I think the answer is true

Answer:

C. 2AgNO3(aq) + CaBr2(aq) --> 2AgBr(s) + Ca(NO3)2(aq)

Explanation:

The factors that affect the rate of solution formation are capable of either increasing the rate of solution formation or decreasing it.

The rate of solution formation from a chemical reaction depends on the following factors:

Therefore, the factors that affect the rate of solution formation are capable of either increasing the rate of solution formation or decreasing it.

Learn more about solutions here:

https://brainly.com/question/23946616

Answer:

Explanation:

# molecules = Avogadro's num x num of moles

number of CO 6.02x10 23 x n CO

  = 6.02x10 23 )  x 1.044= 6.28x 10 23 molecules

Answer:

The answer is 4

Explanation:

=1+98−97+4−3+2−1

=99−97+4−3+2−1

=2+4−3+2−1

=6−3+2−1

=3+2−1

=5−1

=4

Answer: The particles can move apart only if they have enough kinetic energy to overcome this force of attraction. If particles do not have enough kinetic energy to overcome the force of attraction between them, matter exists as a solid. What is particle kinetic energy? Kinetic energy is energy that an object has because of its motion. The Kinetic Molecular Theory explains the forces between molecules and the energy that they possess.

Answer:

4,  6,  21,  sorry

Explanation:

Answer:

a. True

Explanation:

From the basic concepts of acids and bases, we know that when a base accepts a hydrogen ion (H⁺), it forms a conjugate acid which can accept again the H⁺ ion:

B⁻ + H₂O ⇆ BH + OH⁻

The stronger the base, the weaker the conjugate base. Thus, as more strength has a base, lesser strength will have the conjugate base (it will not be able to accept again the H⁺ ion). For example, when water (H₂O) loses its H⁺ , it forms the conjugate base OH⁻. So, OH⁻ is the stronger base that can exist in an aqueous solution.

H₂O ⇆ H⁺ + OH⁻

In fact, strong bases are hydroxides, such as NaOH or KOH.

Answer:

The process of photosynthesis in plants releases oxygen into the atmosphere. Respiration by plants and animals, as they use the energy stored in food, and the process of decomposition of dead organisms, releases carbon dioxide into the atmosphere. All three work together to maintain the carbon dioxide-oxygen cycle.

Thats just a thought though.

Answer:

Chemistry is sometimes called “the central science,” because it bridges physics with other natural sciences, such as geology and biology. Chemistry is the study of matter and its properties.

Explanation:

~found it~

The volume of hydrogen gas required to produce 25.0 grams of water at STP is 31.2 liters.

The balanced chemical equation for the reaction between hydrogen gas and oxygen gas to produce water is:

2H2(g) + O2(g) → 2H2O(l)

From the equation, we can see that 2 moles of hydrogen gas are required to produce 2 moles of water. The molar mass of water is 18 g/mol, so 2 moles of water has a mass of 36 g.

Therefore, to produce 25.0 grams of water, we need to use:

(25.0 g / 36.0 g/mol) * 2 mol H2/mol H2O = 1.39 mol of H2

At STP (standard temperature and pressure), 1 mole of gas occupies 22.4 L of volume.

So, 1.39 moles of H2 will occupy:

1.39 mol x 22.4 L/mol = 31.2 L

Learn more about volume of hydrogen gas here: https://brainly.com/question/17169574

#SPJ1

The abundance for the isotopes = 65%(isotope 1) and 35%(isotope 2)

The elements in nature have several types of isotopes

Isotopes are atoms whose no-atom has the same number of protons while still having a different number of neutrons.

So Isotopes are elements that have the same Atomic Number (Proton)

Atomic mass is the average atomic mass of all its isotopes

Mass atom X = mass isotope 1 . % + mass isotope 2.%

The average atomic mass of fictitious element Z is 261.4 amu

isotopes 1 = 260, x%

isotopes 2 = 264, 100-x%

\(\tt avg~atomic~mass=260x\%+264(100-x)\%\\\\261.4=2.6x+264-2.64x\\\\0.04x=2.6\\\\x=65\)

Approximately 631.5 liters of dry air at 25°C and 750 torr would need to be processed to produce 150 liters of liquid \(O_2\) -183°C.

To solve this problem, we need to consider the ideal gas law and the molar volume of gases.

First, we can calculate the number of moles of oxygen in 150 L of liquid \(O_2\) at -183°C. To do this, we divide the mass of liquid oxygen by its molar mass:

Mass of liquid oxygen = volume of liquid oxygen * density of liquid oxygen = 150 L * 1.14 g/mL = 171 g

Molar mass of oxygen (O2) = 32 g/mol

Number of moles of oxygen = mass of oxygen / molar mass of oxygen = 171 g / 32 g/mol ≈ 5.34 mol

Since the mole fraction of oxygen in dry air is given as 0.21, we can calculate the total moles of dry air needed to produce 5.34 mol of oxygen:

Moles of dry air = moles of oxygen / mole fraction of oxygen = 5.34 mol / 0.21 ≈ 25.43 mol

Now, we can use the ideal gas law to calculate the volume of dry air at 25°C and 750 torr (convert to atm) that corresponds to 25.43 mol:

PV = nRT

P = 750 torr * (1 atm / 760 torr) ≈ 0.987 atm

V = volume of dry air (unknown)

n = 25.43 mol

R = 0.0821 L·atm/(mol·K)

T = 25°C + 273.15 = 298.15 K

Solving for V:

V = nRT / P = (25.43 mol)(0.0821 L·atm/(mol·K))(298.15 K) / 0.987 atm ≈ 631.5 L

For more such questions on dry air visit:

https://brainly.com/question/14247097

#SPJ8

\(3H_2+2N_2\rightarrow 2NH_3\)

Given:

The unbalanced chemical equation:

\(H_2+N_2\rightarrow NH_3\)

To find:

The balanced chemical equation and to determine of \(N_2\) needed to produce 11.35 g of \(NH_3\).

Solution:

The balanced chemical reaction:

\(3H_2+2N_2\rightarrow 2NH_3\)

Mass of ammonia needed to produce = 11.35 g

Moles of ammonia :

= \(\frac{11.35 g}{17.031 g/mol}=0.6664 mol\)

    \(3H_2+2N_2\rightarrow 2NH_3\)

According to the reaction, 2 moles of ammonia is obtained from 2 moles of dinitrogen, then 0.6664 moles of ammonia will be obtained from :

\(=\frac{1}{1}\times 0.6664 mol=0.6664 \text{mol of } N_2\)

Moles of dinitrogen required = 0.6664 mol

Mass of 0.6664 moles of dinitrogen:

\(=0.6664 mol\times 28.0134 g/mol=18.67 g\)

The mass of \(N_2\) needed is 18.67 grams.

Learn more about the unitary method here:

brainly.com/question/4147368?referrer=searchResults

brainly.com/question/2499283?referrer=searchResults

The boiling point of water is 100.0 °C, the boiling point of the solution will be : 101.49 °C.The correct answer is option (a) 100.00049 °C.

Ideal Solution : An ideal solution is a homogeneous mixture of two or more components that obeys Raoult's law, which states that each component's vapor pressure is proportional to its mole fraction.The boiling point of a solution depends on the solvent's properties and the solute's concentration. It's dependent on the mole fraction of the solvent and solute, as well as the total concentration of the solution. The change in boiling point of a solution is given byΔTb = Kb × m × i, whereKb = ebullioscopic constant, m molarity of the solution, and i = van't Hoff factor.Assuming that the solution's behavior is ideal, we may use the molality of the solution to compute the boiling point elevation of the solution.The molality of the solution is given by the following formula:m = (n₂ / m₂) ÷ (n₁ / m₁), where n is the number of moles, m is the mass, and the subscripts 1 and 2 refer to water and non-volatile solute sucrose, respectively.The molar mass of sucrose (C₁₂H₂₂O₁₁) is342.3 g/mol; therefore, the number of moles of sucrose is115.0 g ÷ 342.3 g/mol = 0.335 mol.m₁ = mass of water = 350.0 g, and m₂ = mass of sucrose = 115.0 g, as given in the problem.Therefore, the molality of the solution is given by:m = (0.335 mol / 0.115 kg) ÷ (1 mol / 1 kg) = 2.91 mol/kg.Substituting these values in the formula for ΔTb, we get:ΔTb = Kb × m = 0.512 °C m⁻¹ × 2.91 mol/kg = 1.49 °C.100.0 °C + 1.49 °C = 101.49 °C.

for such more questions on solution

https://brainly.com/question/25326161

#SPJ8

Explanation:

calculate the change in velocity of an eagle that accelerates downward at 4.6m/s for a time of 5second?

The molar heat capacity of copper is adequately given by the equation Cp = 4.7310-5 * T3 (J / molK ). 1.9 J / mol * K is the absolute entropy of copper at 20K.

The amount of energy needed to add one mole of a chemical substance in the form of heat in order to raise its temperature by one unit is known as the material's molar heat capacity.

The molar heat capacity is the heat capacity for one mole of a material, whereas the specific heat capacity, which is sometimes just termed specific heat, is the heat capacity for one gram of a substance.

The molar heat capacity ( Cp ) of a substance as a function of temperature, and then plot the value of Cp / T versus temperature. The absolute entropy of a material at any temperature T is represented as the area under the curve between 0 K and T.

Thus, the option D is correct.

To learn more about molar heat capacity follow the link below;

https://brainly.com/question/6363778

#SPJ12

Answer:

Mn2+(aq) + 2H2O(l)  ⇒ MnO2(s) + 4H+(aq) + 2e-

Explanation:

Step 1: Data given

The oxidation number of manganese ion (Mn2+ ) is +2

The oxidation number of manganese dioxide  is +(MnO2)4

This means the oxidation number from Mn will go from +2 to +4, since it's increased, this is an oxidation reaction

Mn2+(aq)  ⇒ MnO2(s)

We have to balance both sides. Mn is already the same. But on the right side we have O atoms. T obalance both sides we have to add O atoms to the left side. This by adding 2x H2O

Mn2+(aq) + 2H2O(l)  ⇒ MnO2(s)

Now the amount of O atoms is balanced, but we have H- atoms at the left side. To balance we have to add 4 H atoms to the right side

Mn2+(aq) + 2H2O(l)  ⇒ MnO2(s) + 4H+(aq)

Now the amount of atoms is balanced at both sides. We also have to check if the charge on both sides is the same.

Since the left side has a charge of +2, and right has a charge of +4, we have to add 2 electrons to balance this.

Mn2+(aq) + 2H2O(l)  ⇒ MnO2(s) + 4H+(aq) + 2e-

Answer:

Highest boiling point - 0.43 m Urea

Second highest boiling point - 0.20 m NiSO4

Third highest boiling point - 0.19 m NH4I

Lowest boiling point - 0.17 m NH4NO3

Explanation:

We know that;

ΔT = kb m i

Where;

ΔT = boiling point elevation

kb = boiling point constant

m = molality of the solution

i = Van't Hoff factor

For NiSO4 , NH4I  and NH4NO3 , the Van't Hoff factor, i = 2

But for Urea, the Van't Hoff factor, i = 1

We also have to consider both the values of the molality and Van't Hoff factor , knowing that a higher molality and a higher Van't Hoff factor leads to a higher ΔT and consequently a higher boiling point.

This facts above account for the arrangement of substances shown in the answer.

Answer:

p = 900 kg·m/s

Explanation:

Calculate momentum given mass and velocity:

P = M*V

p = 150*6

For an electron as a particle, E = \(1/2mv^2\)

For an electron as a particle, the energy E can be described using the equation:

E =  \(1/2mv^2\)

where

This equation represents the kinetic energy of the electron, which is the E is the energy

energy associated with its motion.

This equation assumes classical mechanics and does not take into account relativistic effects that become significant at high speeds close to the speed of light.

More on electrons can be found here: https://brainly.com/question/12001116

#SPJ1

Title: The First Amendment: Safeguarding Fundamental Freedoms

While all amendments are crucial, the First Amendment holds unparalleled significance in upholding the principles of liberty, equality, and democracy.

The First Amendment to the U.S. Constitution is undoubtedly the most important amendment as it safeguards fundamental freedoms that form the bedrock of a democratic society.

This amendment, which encompasses the rights of freedom of speech, religion, press, assembly, and petition, plays a vital role in protecting individual liberties and ensuring a just and inclusive society. There are three key reasons why the First Amendment stands out as the cornerstone of our democracy.

Firstly, freedom of speech allows citizens to express their ideas, opinions, and criticisms, fostering a robust marketplace of ideas essential for progress and social change. This right empowers individuals to challenge authority, hold public officials accountable, and engage in meaningful dialogue that drives societal progress.

Secondly, freedom of religion guarantees individuals the right to practice their faith without interference from the state. This principle promotes religious tolerance, diversity, and pluralism, creating a society where individuals can freely worship and live in accordance with their beliefs.

Lastly, freedom of the press ensures an informed citizenry by safeguarding independent journalism. A free press acts as a check on governmental power, exposes corruption, and provides essential information necessary for a functioning democracy.

For ore such questionns on Amendment visit:

https://brainly.com/question/28383565

#SPJ8

Answer:

Displacement

Explanation:

Answer:

When something is gross, it's disgusting. The noun, a gross, is the complete amount (before expenses), and the verb "to gross" is to bring in money. Two things will tell you which meaning is the right one with a word like gross: the part of speech and the context. ... earn before taxes, expenses, etc.

Explanation:

Answer:

You use gross to describe something unacceptable or unpleasant to a very great amount, degree, or intensity.

Answer:

I believe it is a chemical change.

In this reaction, aqueous solutions of lithium fluoride and potassium chloride are mixed, but no precipitate forms. This is because the products of the reaction (LiCl and KF) are both soluble in water, and therefore remain in the aqueous state.

Reaction is a process in which a system changes in response to an external stimulus. It is a response to an action, event, or phenomenon, and it is typically expressed in the form of an observable physical or mental change. Reactions can take place in a variety of forms, including chemical reactions, physical reactions, and psychological reactions. Chemical reactions are the most common type of reaction and involve the rearrangement of atoms and molecules in order to form new substances. Physical reactions involve changes in the physical properties of a system, such as changes in temperature, pressure, or volume. Psychological reactions include changes in behavior and emotion.

The complete and balanced molecular equation for the reaction between aqueous solutions of lithium fluoride and potassium chloride is:
LiF (aq) + KCl (aq) → LiCl (aq) + KF (aq)
The complete ionic equation for this reaction is:
Li+ (aq) + F- (aq) + K+ (aq) + Cl- (aq) → Li+ (aq) + Cl- (aq) + K+ (aq) + F- (aq)

To learn more about reaction
https://brainly.com/question/25769000
#SPJ1