Nio conducts a science experiment. He puts yeast into a bottle with water and sugar, and then caps the bottle with a balloon. He returns two hours later and notices there are bubbles on the surface of the mixture in the bottle and that the balloon has inflated, but there are no other apparent changes.
What most likely happened?

a non-chemical change, because there are no indicators of chemical changes taking place
a chemical change, because the mixture changed color
a chemical change, because a gas was produced
a non-chemical change, because the changes that occurred are reversible

Answer: o.8/11.o

Explanation:

Answer:

they move closer to each other

Answer:

They move closer to each other

Explanation:

Got it right on the test

Hope this helps :)

The value of Kp for the given reaction N2O4(g) ⇌ 2NO2(g) is 1.47x10^-3 atm. To calculate Kp for the reaction N2O4(g) ⇌ 2NO2(g) using the given Kc value, we need to consider the relationship between Kp and Kc.

Kp is the equilibrium constant expressed in terms of partial pressures, while Kc is the equilibrium constant expressed in terms of concentrations. The relationship between them is Kp = Kc(RT)^Δn, where R is the gas constant, T is the temperature in Kelvin, and Δn represents the difference in the number of moles of gaseous products and reactants.

For the reaction N2O4(g) ⇌ 2NO2(g), the stoichiometric coefficients indicate that the change in the number of moles of gas is Δn = (2 - 1) = 1. Given the value of Kc as 5.9x10^-3, we can now calculate Kp. The value of R is 0.0821 L·atm/(mol·K), and let's assume the temperature is 298 K. Plugging in these values into the equation, we have Kp = (5.9x10^-3)(0.0821 L·atm/(mol·K))(298 K)^1 = 1.47x10^-3 atm.

Therefore, the value of Kp for the given reaction N2O4(g) ⇌ 2NO2(g) is 1.47x10^-3 atm.

Learn more about reactants here: brainly.com/question/30129541

#SPJ11

Electrons were in orbits of both fixed size and energy.

The main features of Niels Bohr's proposed atomic model are listed below.

To learn more about Niels Bohr's refer the link:

https://brainly.com/question/12439099

#SPJ1

Molarity of the solution 0.2278 M.

Concentration of the aluminum cation  0.2278 M.

Concentration of the chloride anion  0.6834 M.

Molarity is the total number of moles of solute dissolved in 1 liter solution. The unit used is mol/L.

Here,

Aluminium chloride (AlCl₃; 133.34 g/mol) dissolves in water thus:

The balanced equation (I) will be: AlCl₃--> Al₃ + 3.Cl

Molarity is an unit of chemical concentration given in moles of solute (AlCl₃) per liters of solution.

There are 500 mL of solution=0.50 L

The moles of AlCl₃ are:

15.2 g of AlCl₃ × (1 mol/133.34) = 0.1139 moles of AlCl₃

The molarity of the solution is: moles/volumes

= 0.2278 M

In equation (I) you can see that 1 mole of AlCl₃ produces 1 mole of aluminum cation. The mole of potassium cation are:

0.1139 moles × 1 = 0.1139 moles

The concentration is: 0.1139/0.50

= 0.2278 M

According to the equation (I) the moles of AlCl₃ produces 3 moles of Cl, thus, concentration of phosphate anion is

= 0.1139 moles × 3 = 0.3417

Concentration : 0.3417/0.50L

= 0.6834

Hence,

the molarity of the solution = 0.2278 M

the concentration of aluminum cation = 0.2278 M

the concentration of chloride anion = 0.6834 M

To know more about moles, refer : https://brainly.com/question/26416088

#SPJ4

Answer:To calculate the Molarity of a 70 wt. % Nitric Acid the number of moles of HNO 3 present in 1 liter of acid needs to be calculated. Knowing the density of the acid to be 1.413 g/mL, we can calculate the weight of 1 L of 70% HNO 3 to be 1413

Explanation:

The mass of Cu-63 is approximately 34.02% of the total mass of the two isotopes.To find the mass of Cu-63, we can use the given information about the isotopic composition and the mass ratio of the isotopes.

Let's assume that x represents the mass of Cu-63. Since the mass of Cu-65 is larger than Cu-63, we can express the mass of Cu-65 as 1.0318x.

According to the isotopic composition, Cu-63 constitutes 69.170% of naturally occurring copper, which means that the mass of Cu-63 accounts for 69.170% of the total mass of the two isotopes.

We can set up the equation:

x + 1.0318x = 69.170% (total mass of the two isotopes)

Simplifying the equation:

2.0318x = 69.170% (total mass of the two isotopes)

Dividing both sides by 2.0318:

x = (69.170%)/(2.0318)

Calculating the value:

x ≈ 34.02%

Therefore, the mass of Cu-63 is approximately 34.02% of the total mass of the two isotopes.

To learn more about isotopic composition click here: brainly.com/question/33504446

#SPJ11

Denise ought to keep detailed record of the experiment to allow someone to do the same investigation and check the accuracy of results. Option D

The term experiment has to do with cause and effect relationships. We know that the cause is what leads to the effect if the process can be tested in a laboratory. The experiment that as performed by Denise was targeted at finding what time of the day is warmest.

From the results of the experiment, we can conclude that Denise ought to keep detailed record of the experiment to allow someone to do the same investigation and check the accuracy of results.

Learn more about experiment:https://brainly.com/question/11256472

#SPJ1

A, 1.204x10²⁴ atoms of calcium would weigh approximately 8.014 grams.

To determine the weight in grams of 1.204x10²⁴ atoms of calcium, we need to use the molar mass of calcium and Avogadro's number.

The molar mass of calcium (Ca) will be approximately 40.08 g/mol. This will be found on the periodic table.

Avogadro's number (NA) is approximately 6.022 x 10²³ atoms/mol. It will represents the number of atoms or molecules in one mole of the substance.

Now we can calculate the weight in grams using the given number of atoms;

weight = (number of atoms) x (molar mass) / Avogadro's number

weight = (1.204x10²⁴ atoms) x (40.08 g/mol) / (6.022 x 10²³ atoms/mol)

Simplifying the calculation;

weight = (1.204 x 40.08) / 6.022 g

weight ≈ 48.255 / 6.022 g

weight ≈ 8.014 g

Therefore, 1.204x10²⁴ atoms of calcium would weigh approximately 8.014 grams.

To know more about calcium here

https://brainly.com/question/32451675

#SPJ4

Metals and their alloys, which are crystalline, should be expected to demonstrate a ductile/brittle transition.

Ductility is the property of a metal that allows it to be elongated without breaking. When metals are under stress, they either stretch (ductile) or fracture (brittle). A crystal or crystalline solid is a solid material whose constituents (such as atoms, molecules, or ions) are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions. In addition, macroscopic single crystals are usually identifiable by their geometrical shape, consisting of flat faces with specific, characteristic orientations. The scientific study of crystals and crystal formation is known as crystallography. The process of crystal formation via mechanisms of crystal growth is called crystallization or solidification.

Metals and their alloys, which are crystalline, should be expected to demonstrate a ductile/brittle transition. The ductile/brittle transition temperature (DBTT) is the temperature below which a metal loses its ductility, which means it can no longer be extended or deformed without fracturing.

Learn more about Metals at

https://brainly.com/question/29404080

#SPJ11

The valency of iron (Fe) in this equation is 2

While, the valency of chlorine is 1

Therefore, we know that iron wants to give away 2 electrons to attain octet configuration, and chlorine wants to get an electron to attain octet configuration.

Also while find the products the number of atoms is similar to the oppostie valency

Fe = 1 atom , Cl = 2 atoms

Which will form FeCl₂

Happy to help :)

If you need any help pls ask

Answer:

Single displacement reaction

Explanation:

You have an element (Zinc)  + a compound that consists of an element (Copper) and a polyatomic ion (Sulfate)  

Since there's one element and one compound, the metals in both trade places, giving us Zinc Sulfate and Copper as our products.

This should be the complete balanced equation:

Zn + CuSO4 -------> ZnSO4 + Cu

The Copernican revolution is about the model of the solar system and was given by a polish astronomer. Option C. The discovery that the universe was expanding.

The Copernican Revolution become the paradigm shift from the Ptolemaic model of the heavens, which described the cosmos as having Earth stationery on the center of the universe, to the heliocentric version with the solar on the center of the solar system.

Copernican Revolution, shift the subject of astronomy from a geocentric understanding of the universe, focused around Earth, to heliocentric knowledge, concentrated across the sun, as articulated by the Polish astronomer Nicolaus Copernicus.

This revolution changed the way of thinking of the solar system. Earlier it was thought that earth is in the center of the solar sysytem,i.e; people believed in the geocentric model, but according to Copernicus the solar system has the sun at the center and the remaining planets revolve around it i.e he believed in a heliocentric model.

Learn more about the Copernican revolution here:-https://brainly.com/question/11385060

#SPJ9

An aniline (C6H5NH2) solution at 0.40 M has a pH of 8.59.

To calculate the pH of a 0.40 M solution of aniline \((C_6H_5NH_2)\), we first need to determine the concentration of hydroxide ions \((OH^-)\) produced by the reaction of aniline with water, as aniline is a weak base. We will use the Kb value provided (3.8 x 10^-10) in this calculation.

1. Set up the equilibrium expression for aniline in water:
\(K_b = [C_6H_5NH_3^+][OH^-]\) / \([C_6H_5NH_2]\)

2. Assume a small amount of aniline, x, reacts to form \(C_6H_5NH_3^+\) and \(OH^-\)ions:
\(K_b\) = (x)(x) / (0.40 - x)

3. Since Kb is very small, we can assume x is much smaller than 0.40, so the equation can be simplified to:
\(K_b\) = x^2 / 0.40

4. Solve for x, which represents the concentration of OH- ions:
x = √(\(K_b\) × 0.40) = √(3.8 × 10^-10 × 0.40) = 3.89 × 10^-6 M

5. Calculate the pOH using the OH- concentration:
pOH = -log10(3.89 ×\(10^-6\)) = 5.41

6. Finally, find the pH using the relationship between pH and pOH:
pH = 14 - pOH = 14 - 5.41 = 8.59

Therefore, the pH of a 0.40 M solution of aniline (C6H5NH2) is 8.59.

Learn more about aniline here

https://brainly.com/question/13887633

#SPJ11

Flexible container at  initial volume of 5.12 l contains 8.51 mol of gas. The more gas is then added to the container until it reaches a final volume of the 13.3 l. The number of moles of gas added to the container is 22.1 mol.

The ideal gas equation is as follows :

P V = n R T

The  pressure and temperature of the gas remain constant, WE GET

V₂ / V₁ = n₂ / n₁

n₂ = V₂ n₁ / V₁

Where,

V₁ = 5.12 L

V₂ = 13.3 L

n₁ = 8.51 mol

n₂  = ( 13.3 × 8.51 ) / 5.12

    = 22.1 mol

The number of the moles added is 22.1 mol.

To learn more about ideal gas equation here

https://brainly.com/question/28837405

#SPJ4

Answer:

The concentration of the solution is 5.8168 × \(10^{-4}\) mol.\(dm^{-3}\)

Explanation:

Here, we want to calculate the concentration of the solution.

The unit of this is mol/dm^3

So the first thing to do here is to calculate the number of moles of the solute present, which is the number of moles of AlCO3

The number of moles = mass/molar mass

molar mass of AlCO3 = 27 + 12 + 3(16)  = 27 + 12 + 48 = 87g/mol

Number of moles = 33.4/87 = 0.384 moles

This 0.384 moles is present in 660 L

x moles will be present in 1 dm^3

Recall 1 dm^3 = 1L

x * 660 = 0.384 * 1

x = 0.384/660 = 0.00058168 = 5.8168 * 10^-4 mol/dm^3

Answer:

The correct answer is b) 4.17 g of sodium and 6.42 g of chlorine

Explanation:

According to the law of definite proportions a chemical compound is composed always by the same elements in the same proportions by mass. In this case, the proportion of the elements by mass will be 4.37 g of chlorine (Cl) per 2.84 g of sodium (Na):

4.37 Cl/2.84 g Na= 1.54

We can calculate the proportions of the results in order to see which is the correct:

a) 3.75 g Cl/4.17 g Na = 0.899

b) 6.42 g Cl/4.17 g Na = 1.539 ⇒ ≅1.54

c) 1.05 g Cl/4.17 g Na = 3.971

d) 12.1 g Cl/4.17 g Na = 2.901

The option in which the proportion Cl/Na is equal to 1.54 is option b

The osmotic pressure of a solution made from 12.5 g of CaCl2 in enough water to make 500 mL, if CaCl2 is 78.5% dissociated at 30oC is 167.087 atm

Osmotic pressure and osmosis are connected. Osmosis is the passage of a solvent through a semipermeable membrane into a solution. The pressure that halts the osmosis process is known as osmotic pressure. Osmotic pressure is a collective attribute of material because its value is determined by the solute's concentration rather than its chemical composition.

The formula used to calculate Osmotic Pressure is:-

π = M x R x T x i

Where;

π =osmotic pressure (in atm)

M=molar concentration (in mol/L)

  =(given mass/molar mass)/volume=(12.5g /111.0)/(500/1000)

  =0.224 mol/L

R=Universal gas constant (0.08206 L.atm/mol.K)

T=absolute temperature (in K) = 30.C + 273 = 303 K

i= van't Hoff factor of solute =3

using the formula and  substituting values;

π=0.224 x 0.08206 x 303 x 3

   = 167.087 atm

The osmotic pressure is 167.087 atm

Learn more about osmotic pressure here:-

https://brainly.com/question/14756474

#SPJ4

Answer:

The purpose of this lab is to determine the identity of an unknown liquid by measuring its density, melting point, boiling point, and solubility in both water and alcohol, and then comparing the results to the values for the known substance. Hope this helps!! :)

Balancing a chemical equation involves ensuring that there are equal numbers of atoms of each element on both the reactant and product sides.

Here is the balanced equation:

H2 + Cl2 → 2HCl

The balanced equation shows that there are two hydrogen atoms and two chlorine atoms on both sides. The sum of the coefficients in the balanced equation is 2 + 2 + 2 = 6.

Therefore, the main answer is

6. If you add the coefficients of the balanced chemical equation, you can get the sum of the coefficients.

The coefficients of the balanced equation H2 + Cl2 → 2HCl are 1, 1, and 2, respectively.

Sum of the coefficients = 1 + 1 + 2 = 4.

But this is not the answer you're looking for. This is because it's asking for the sum of the coefficients after balancing.

Learn more about Balancing a chemical equation: https://brainly.com/question/28294176

#SPJ11

Hydration is a specific example of the phenomenon known generally as a. solvation

The act of hydrating involves combining or dissolving an object in water. It is a particular instance of the more general phenomena known as solvation, which is the process by which solvent molecules surround and scatter a solute to create a homogeneous solution. However, hydration explicitly refers to solvation with water as the solvent.

Solvation may also happen with solvents other than water. Solvation is the process through which a solute and solvent interact to stabilise a solute species. Due to its impact on the solubility, reactivity, and behaviour of compounds in solution, solvation is a crucial mechanism in many chemical and biological processes.

Read more about solvation on:

https://brainly.com/question/530845

#SPJ4

Yes. Solubility is 0.070 kg/L

Solution:

Solubility = mass / Volume

Solubility = (0.210kg)/(3L) = 0.070 kg/L

Solubility is defined as the maximum amount of a substance that will dissolve in a specified amount of solvent at a specified temperature. Solubility is a characteristic property of a particular solute/solvent combination, and different substances have very different solubilities.

Adding sugar cubes to your tea or coffee is a common example of a solution. The ability of a sugar molecule to dissolve easily is called solubility. The term solubility can therefore be defined as the property of a substance to dissolve in a particular solvent. Water solubility is a measure of the amount of a chemical that can be dissolved in water at a given temperature.

Learn more about Solubility here:- https://brainly.com/question/23946616

#SPJ4

Since electron orbitals are described as probability clouds, Einstein disagreement with the probable positions of electrons in the orbitals is that, It is not possible to know the orbit of an electron when the position is under probability.

According to Bohr's theory, it is difficult to locate electron or cannot be located in a definite region. Electron has to be found in an orbit and nowhere else. When the probability of finding an electron in a given spherical shell around the nucleus is plotted the distance of the electron from the nucleus for the hydrogen atom, the graph indicates that the probability of finding the electron increases as the distance between the electron and the nucleus decreases

Bohr claimed that electrons a entities had only probabilities if they weren't observed. While Einstein argued that they had independent reality.

But in wave mechanics Model, there is a slight chance of knowing the location of the electron.

Heisenberg uncertainty principle also claim the possibility of knowing the position of electron. Albert Einstein also claim that; to determine the position of an electron to an accurate extent, you would have to compromise your ability to know it's momentum. This inaccuracy will eventually affect the measurement of momentum which will be extremely uncertain.

Since electron orbitals are described as probability clouds, Einstein disagreement with the probable positions of electrons in the orbitals is that, It is not possible to know the orbit of an electron when the position is under probability.

Learn more here: https://brainly.com/question/2663406

As a substance undergoes a change from the solid to the liquid phase at constant temperature, the average kinetic energy of its molecules increases.

The relationship between a molecule's average kinetic energy and absolute temperature is as follows: K = 1 2 m v 2 and K = 3 2 k B T. The average kinetic energy of a substance's particles is directly inversely correlated with its temperature. As the temperature rises, the particles must move more quickly because their mass is constant. The heat that is applied when a substance is heated to a constant temperature (i.e., during the phase change state) causes the vibrating molecules to gain potential energy to dissipate the intermolecular force of attraction and move around freely. The potential energy therefore rises as a result.

Learn more about kinetic energy here:

https://brainly.com/question/26472013

#SPJ4

2 C2H6 + 7 O2 → 6 H2O + 4 CO2 If you start with 5.20 moles of C2H6, 10.4 moles of H2O will produce.

The term mole is defined as the amount of substance of a system which contains as many elementary entities.

One mole of any substance is equal to 6.023 × 10²³ units of that substance such as atoms, molecules, or ions. The number 6.023 × 10²³ is called as Avogadro's number or Avogadro's constant.

The mole concept can be used to convert between mass and number of particles.

5.20 moles of ethane × 4 moles of carbon dioxide / 2 mole of ethane

= 5.20 × 4 / 2

= 10.4 moles

Thus, If you start with 5.20 moles of C2H6, 10.4 moles of H2O will produce.

To learn more about the mole, follow the link;

https://brainly.com/question/26416088

#SPJ1

The reaction's net ionic equation  when sodium phosphate is added to hard water to soften it.

3Ca2++2PO3−4→Ca3(PO4)2(s)

The chemical conversion of one group of chemical constituents into another is known as a chemical reaction.

Chemical reactions take place when atoms' chemical bonds are made or broken.

Reactants are the substances that start a chemical reaction, while products are the substances that come out of the process.

Through chemical processes, plants develop, begin to produce fruit, and then disintegrate to become compost for new plants.

High mineral content water is referred to as hard water. When water percolates through limestone, chalk, or gypsum deposits, which are mostly composed of calcium and magnesium carbonates, bicarbonates, and sulfates, hard water is created. Drinking hard water may offer some health advantages.

For more information on hard water kindly visit to

https://brainly.com/question/28178305

#SPJ4

The saturated vapor pressure of methanol in the vessel is 125.9 mmHg (rounded off to 3 significant figures). The volume percent concentration of methanol in the vapor is 73.2% (rounded off to 3 significant figures).

a. Saturated vapor pressure of methanol in the vessel in mmHg: The vapor pressure of methanol (MeOH) in the vessel can be determined using Dalton's law of partial pressures. MetOH psat = MetOH Pabs

Here, MetOH Pabs is the pressure exerted by the vapor of methanol in the vessel. It is equal to the total pressure in the vessel minus the partial pressure of the inert gas (nitrogen). Pabs = 2 inch of water gauge = 2 x 25.4 mm of water gauge / 1 inch of water gauge = 50.8 mm of water gauge

Total pressure in mmHg = Pabs x 760 mmHg / 406.8 inch of water gauge = 94.8 mmHg

Partial pressure of nitrogen = 2 inch of water gauge = 50.8 mm of water gauge

Partial pressure of methanol = MetOH Pabs MetOH psat = 126 mmHg (at 25°C)

Therefore, the saturated vapor pressure of methanol in the vessel is 125.9 mmHg (rounded off to 3 significant figures).

b. Volume percent concentration of methanol in the vapor: The volume percent concentration of methanol in the vapor can be determined using the ideal gas law and the Dalton's law of partial pressures. V = nRT / PV = volume of the vapor (L)n = number of moles of methanol gas R = gas constant T = temperature (K)P = pressure (atm)

Let's assume that the total volume of the vapor in the vessel is 1 L and the temperature is 25°C (298 K).

The number of moles of nitrogen gas (N2) in the vapor can be determined using the Dalton's law of partial pressures. N2 Pabs = Pabs - MetOH PabsN2 Pabs = 50.8 mm of water gaugeN2 Pabs = 50.8 mm of water gauge x 1 atm / 760 mmHg = 0.067 atmN2 V = nRT / PN2N2 V = (0.067 atm x 1 L) / (0.082 L atm/K mol x 298 K)N2 V = 0.0022 mol

The number of moles of methanol gas (MeOH) in the vapor can be determined using the ideal gas law. MetOH Pabs = MetOH psatMetOH Pabs = 125.9 mm Hg MetOH Pabs = 125.9 mmHg x 1 atm / 760 mmHg = 0.165 atmMetOH V = nRT / PMetOH V = (0.165 atm x 1 L) / (0.082 L atm/K mol x 298 K)MetOH V = 0.006 mol

The volume percent concentration of methanol in the vapor can be determined using the following equation.

Volume percent concentration of MeOH = MetOH V / (N2 V + MetOH V) x 100%

Volume percent concentration of MeOH = 0.006 mol / (0.0022 mol + 0.006 mol) x 100%

Therefore, the volume percent concentration of methanol in the vapor is 73.2% (rounded off to 3 significant figures).

To know more about saturated vapor pressure refer to:

https://brainly.com/question/30447018

#SPJ11

The value of ΔGrxn for the given reaction is -156.74 kJ·mol-1 at 25 °C.

To calculate ΔGrxn for the given reaction, we can use the following equation:

ΔGrxn = ΣnΔfG(products) - ΣmΔfG(reactants)

where ΔfG is the standard molar Gibbs free energy of formation, n and m are the stoichiometric coefficients of the products and reactants respectively.

Let's start by writing the balanced chemical equation for the reaction:

\(SO_2(g) + 2 H_2(g)\) → \(S(s) + 2 H_2O(g)\)

Now we can use the given values of ΔfG to calculate ΔGrxn:

ΔGrxn = [ΔfG(S) + 2ΔfG(\(H_2O\))] - [ΔfG(\(SO_2\)) + 2ΔfG(\(H_2\))]

ΔGrxn = [0 + 2(-228.57 kJ·mol-1)] - [-300.4 kJ·mol-1 + 2(0)]

ΔGrxn = -457.14 kJ·mol-1 + 300.4 kJ·mol-1

ΔGrxn = -156.74 kJ·mol-1

For more question on ΔGrxn click on

https://brainly.com/question/31384759

#SPJ11