Saccharomyces cerevisiae causes bread to rise by creating carbon dioxide bubbles as a byproduct of fermentation. select one: a. true b. false

Answer: Hot water freezes faster.

Explanation: It is because of the Mpemba effect taking place, and even though it seems impossible, it could have less dissolved gas in it, or even take up less mass because of this.

To handle coin top containers  place hand over label, place stopper on workbench to avoid dropping it, pour using a stirring rod and wipe off any drops.

Handling coin top containers requires care to prevent spills and ensure safe handling. Here are the steps to handle coin top containers properly:

1. Place hand over the label: Before handling the coin top container, ensure that your hand is securely placed over the label or lid. This will help prevent accidental opening or spillage of the container's contents.

2. Place stopper on workbench: If the coin top container has a removable stopper, place it on a stable workbench or surface. By doing so, you can keep the stopper readily accessible and avoid the risk of dropping it or misplacing it.

3. Pour using a stirring rod: If you need to transfer the contents of the coin top container, use a clean stirring rod or suitable utensil for pouring. Slowly and carefully pour the desired amount of liquid from the container, taking care to control the flow and minimize the chances of spills or splashes.

4. Wipe off any drops: After pouring, inspect the outside of the container and the surrounding area for any spills or drops. If you notice any liquid on the container or workbench, use a clean cloth or paper towel to wipe off the drops promptly. This helps maintain cleanliness and prevent accidental contact with the spilled substance.

Remember to follow any specific handling instructions provided by the manufacturer or any safety guidelines relevant to the contents of the coin top container.

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Answer: The answer is Net Forces.

Net force is the vector sum of forces acting on a particle or body.

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Answer:

it is unbalanced force

Explanation:

hope this helps u stay safe

Answer:

\( \huge\blue{ \mid{ \underline{ \overline{ \tt ♡ AQUAMARINE ♡ }} \mid}}\)

=> The colour of this stone is usually a pale greenish blue, owing to the presence of iron impurities. Stones that are treated with heat look more blue than green. On the Mohs scale of hardness, aquamarine ranges between 7.5 and 8 making it a relatively hard gemstone.

=> The best way to identify a real aquamarine stone is by looking at its colour. In its natural form, they have a pale blue colour, which is similar to seawater. They may have a slight green or yellow tint as well. Naturally occurring gems have excellent clarity and transparency.

=> The hardness of the stone is another feature you can use to identify the stone. Aquamarine stones are hard and they don’t get scratches easily. However, they can easily scratch glass and other such surfaces. So, if you find visible scratches on the stone, rethink your decision to buy it.

=> Most faceted aquamarine stones are clean to the eye and clear of any inclusions. However, translucent and opaque aquamarine is also available. These are usually fashioned into cabochons or beads. In some cases, inclusions may appear as parallel tubes. Such stones can be crafted to show a cat’s eye. Stones with cat’s eye and star effect are rare and highly priced.

Answer:

Nitrogen

Explanation:

because a rule i use called the "en,ne" rule

Any element that ends with this is diatomic

Statements that describe the reaction of water with an alkyne in the presence of an acid catalyst include :

* The ketone form of the product is more stable than the enol form.

* The initial product of the reaction is an enol.

* The enol tautomerizes to form a ketone.

* HgSO4 is used as an additional catalyst in this reaction.

A catalyst is a substance that accelerates a chemical response or lowers the temperature or pressure needed to begin one, without itself being consumed in the course of the reaction.

Catalysts speed up a chemical reaction by means of reducing the amount of power you need to get one going. Catalysis is the backbone of many business tactics, which use chemical reactions to turn raw materials into beneficial products.

Catalysts may be labeled as homogeneous, heterogeneous, or enzymatic. Homogeneous catalysts exist within the identical phase because of the reactants, whereas heterogeneous catalysts exist in a specific phase than the reactants.

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The number of molecules= 3.55 x 10²⁴

Given

5.9 moles of NaCl

Required

The number of molecules

Solution

The mole is the number of particles(molecules, atoms, ions) contained in a substance  

1 mol = 6.02.10²³ particles

Can be formulated

N=n x No

N = number of particles

n = mol

No = Avogadro's = 6.02.10²³

So for 5.9 moles :

= 5.9 x 6.02 x 10²³

= 3.55 x 10²⁴

Sulfuric acid is added to Fischer's esterification reaction as an acid catalyst to increase the pace of the reaction while also going about as a drying-out specialist.

The Fischer esterification is an acid-catalyzed harmony reaction. The reaction proceeds slowly and adding sulfuric acid increases the pace of the reaction. Concentrated sulfuric acid is used to give the greatest yield to the item.

Fischer esterification or Fischer-Speier esterification is a special sort of esterification by refluxing a carboxylic acid and a liquor in the presence of an acid catalyst. The reaction was first described by Emil Fischer and Arthur Speier in 1895. Fischer esterification is a natural reaction used to change a carboxylic acid and a liquor over completely to an ester using a strong acid catalyst. It is also known as Fischer-Speier Esterification.

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The most probable speed of a gas with a molecular weight of 20.0 amu at 50.0 °C is E) 51.5 m/s.

The average kinetic energy of the gas molecules is given by:

\(\( \overline{E_k} = \frac{3}{2}kT \)\)

where k is the Boltzmann constant, and T is the temperature.

The molecular speed distribution depends on the velocity of the molecules and their number. This distribution function is called the Maxwell-Boltzmann distribution.

The most probable speed is the speed at which the probability density function is highest. It is given by:\( v_{mp} = \sqrt{\frac{2kT}{m}} \)where m is the molecular weight of the gas and T is the temperature.

From the given data:m = 20.0 amu = 20.0 × 1.66 × 10^-27 kg (mass of one amu)T = 50.0 °C = 50.0 + 273.15 K (converting to Kelvin)Putting the values in the equation for most probable speed:

\(vmp = sqrt[2 × 1.38 × 10^-23 J/K × (50.0 + 273.15) K / (20.0 × 1.66 × 10^-27 kg)]vmp = 51.5 m/s\)

Hence, the most probable speed of the given gas is 51.5 m/s. Therefore, option E is the correct answer.

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Answer:

Mechanical energy is energy that results from movement or the location of an object. Mechanical energy is the sum of kinetic energy and potential energy.

Explanation:

Nuclear energy is energy resulting from changes in the atomic nuclei or from nuclear reactions.

Example: Nuclear fission, nuclear fusion, and nuclear decay are examples of nuclear energy. An atomic detonation or power from a nuclear plant are specific examples of this type of energy.

The atom has 21 protons because it is neutral and has the same number of protons as electrons. It also has 22 neutrons, which we calculated by subtracting the number of protons from the mass number.

The mass number of an atom represents the total number of protons and neutrons in its nucleus. Since the atom is neutral, it means it has the same number of protons as electrons.

Given that the atom has a mass number of 43, this means it has a total of 43 protons and neutrons. We can determine the number of protons by subtracting the number of neutrons from the mass number.

To find the number of neutrons, we subtract the number of protons from the mass number. Since the atom is neutral and has 21 electrons, which is also equal to the number of protons, we can conclude that it has 21 protons.

Therefore, to determine the number of neutrons, we subtract 21 (number of protons) from 43 (mass number). This gives us 22 neutrons.

In summary, the atom has 21 protons because it is neutral and has the same number of protons as electrons. It also has 22 neutrons, which we calculated by subtracting the number of protons from the mass number.

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Answer:

D

Explanation:

The correct answer that gives a good example of how the same chemical used to help people can harm the environment would be when excess fertilizers run off into rivers and create a dead zone.

Fertilizers are usually applied to crops as an agricultural practice by farmers to enhance the yield of the crops and boost food or raw materials production. However, excess fertilizer gets washed into nearby water bodies and ends up creating a low-oxygen zone that is incapable of supporting lives within the water body - also known as dead zones.

The correct option is, therefore, D.

Answer:

\(\boxed{It\ will\ shift\ to\ create\ less\ of\ substance\ A}\)

Explanation:

If the concentration of any substance A in a dynamic equilibrium increases, The equilibrium will be  shifted to its opposite side so that Substance A can be created less and the substance opposite to A can be created more so that a "dynamic equilibrium" can again be established.

For the given molecules, toluene and isobutene would have greater solubility in hexane and sucrose and glycol would have greater solubility in water.

Solubility refers to the maximum amount of a substance that can be dissolved in a given amount of solvent at a specified temperature. Solubility is a characteristic property of a specific solute–solvent combination, and different substances have greatly differed solubilities. In other words, it is the ability of a substance - the solute, to combine and form a solution with another substance - the solvent. Polar solutes such as sucrose and glycol are more soluble in polar solvents (i.e., water), and nonpolar solutes such as toluene and isobutene are more soluble in nonpolar solvents (i.e., hexane).

Note: The question is incomplete as it is missing options which are A) toluene B) sucrose C) glycol D) isobutene.

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Answer:

weathering and erosion

Explanation:

Sand forms when rocks break down from weathering and eroding over thousands and even millions of years. Rocks take time to decompose, especially quartz (silica) and feldspar. Often starting thousands of miles from the ocean, rocks slowly travel down rivers and streams, constantly breaking down along the way.

Answer:

weathering and erosion

Answer:

Explanation:

It is the lighter outer part of a shadow, and it is a factor that causes partial solar eclipses, penumbral lunar eclipses, and partial lunar eclipses. You can consider it a shadow within a shadow

The combine mass of the sled and the rider, given that each dog pulled with a force of 30 N is 200 Kg

We know that force is related to mass and acceleration according to the following formula:

Force (F) = mass (m) × acceleration (a)

F = ma

With the above formula, we can determine the combined mass of the sled and rider. Details below.

From the question given above, the following data were obtained:

The combined mass can be obtained as follow:

Force = mass × acceleration

240 = mass × 1.2

Divide both sides by 1.2

Mass = 240 / 1.2

Mass = 200 Kg

Thus, the combine mass is 200 Kg

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Answer:

N2 + O2 → 2NO is an oxidation-reduction reaction.

Explanation:

An oxidation-reduction reaction (also know as Redox reaction) is a type of chemical reaction that involves a transfer of electrons between two species. It occurs when the oxidation number of a molecule, atom, or ion changes by gaining or losing an electron.

We will consider the equations one after the other.

Oxidation numbers of the individual element on the reactant side:

KOH : K = +1, O = -2, H = +1

HNO3 : H = +1, N = +5, O = -2

Oxidation numbers of the individual element on the product side:

H2O: H = +1, O = -2

KNO3: K = +1, N = +5, O = -2

There is no change in the oxidation numbers, hence, it is not an oxidation-reduction reaction.

Oxidation numbers of the individual element on the reactant side:

CaCl2 : Ca = +2, Cl = -1

Na2SO4: Na = +1, S = +6, O = -2

Oxidation numbers of the individual element on the product side:

CaSO4: Ca = +2, S = +6, O = -2

NaCl: Na = +1, Cl = -1

There is no change in the oxidation numbers, hence, it is not an oxidation-reduction reaction.

Oxidation numbers of the individual element on the reactant side:

AgNO3: Ag = +1, N = +5, O = -2

NaCl: Na = +1, Cl = -1

Oxidation numbers of the individual element on the product side:

AgCl: Ag = +1, Cl = -1

NaNO3: Na: +1, N = +5, O = -2

There is no change in the oxidation numbers, hence, it is not an oxidation-reduction reaction.

Oxidation numbers of the individual element on the reactant side:

Al2(SO4)3: Al =+3, S = +6, O = -2

KOH: K = +1, O = -2, H = +1

Oxidation numbers of the individual element on the product side:

Al(OH)3: Al =+3, O = -2, H = +1

K2SO4: K = +1, S = +6, O = -2

There is no change in the oxidation numbers, hence, it is not an oxidation-reduction reaction.

Oxidation numbers of the individual element on the reactant side:

N2: N = 0

O2: O = 0

Oxidation numbers of the individual element on the product side:

NO: N = +2, O = -2

There are changes in the oxidation numbers, hence, it is an oxidation-reduction reaction.

The following is an oxidation-reduction reaction - N2 + O2 → 2NO

Oxidation numbers represent the potential charge of an atom in its ionic state. If the oxidation number decreases in a reaction, it is reduced. If an atom's oxidation number increases, it is oxidized.

= > Oxidation state of N in the reactant is 0

=> Oxidation state of N in the product is +2

So, N is oxidized

=> Oxidation state of O in the reactant is 0

=> Oxidation state of O in the product is -2

So, O is reduced

Thus, the following is an oxidation-reduction reaction - N2 + O2 → 2NO

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Answer:

wwwwwwwwww

Explanation:

Answer:

Explanation:

Answer:

The last one

Explanation:

When we are classifying we try to distinguish between the type, the properties just like clothes

Answer:

I mean If you're asking a question, then yes.

Answer:

A)

4, 7, 4, 6

B)

12 moles

Explanation:

\( NH_{3}(g) + O_{2}(g) \: → NO_{2} + H_{2}O(g)\)

__↑______↑

8.00 mol | 14.00 mol

________________

\( NH_{3}(g) + O_{2}(g) \: → NO_{2} + H_{2}O(g)\)

You can turn this into a system of variables which are solvable.

To do this, create variables for the coefficients of each compound in the reaction respectively.

\( a(NH_{3}(g)) + b(O_{2}(g)) → \\c(NO_{2}) + d(H_{2}O(g))\)

Because to be balanced, the count of atoms in each element of the compound correspond to the coefficient of the variable in that compound so that the count of the left (reactant) side is set equal to the right (product) side.

a corresponds to the coefficient of the first compound, b corresponds to the coefficient of the second compound, c corresponds to the coefficient of the third compound, and d corresponds to the coefficient of the fourth compound.

(Reactant = Product)

Reactant: 1a [N] Product: 1c.

Reactant: 3a [H] Product: 2d.

Reactant: 2b [O] Product: 2c + 1d.

Thus the system is:

1a = 1c

3a = 2d

2b = 2c + 1d.

Then just use the substitution methods to solve.

The ratio of 4.28 of [CO₃²⁻]/[HCO₃⁻] is needed to make a buffer with pH 11.00 using the bicarbonate ion (HCO₃⁻), which is a weak acid. The buffer equation for HCO₃⁻ is: HCO₃⁻ + H₂O ⇌ H₂CO₃ + OH⁻

Since the pH of the buffer is given, the pOH can be calculated using the equation:

pOH = 14.00 - pH = 14.00 - 11.00 = 3.00

The pOH can then be used to calculate the hydroxide ion concentration [OH⁻] using:

pOH = -log[OH⁻]

3.00 = -log[OH⁻]

[OH⁻] = 10⁻³ M

The bicarbonate ion is a weak acid and its conjugate base, carbonate ion (CO₃²⁻), can be calculated using the Henderson-Hasselbalch equation:

pH = pKa + log([CO₃²⁻]/[HCO₃⁻])

11.00 = -log(4.8x10¹¹) + log([CO₃²⁻]/[HCO₃⁻])

log([CO₃²⁻]/[HCO₃⁻]) = 11.00 + log(4.8x10¹¹)

log([CO₃²⁻]/[HCO₃⁻]) = 11.00 + (-10.32)

log([CO₃²⁻]/[HCO₃⁻]) = 0.68

[CO₃²⁻]/[HCO₃⁻] = antilog(0.68)

[CO₃²⁻]/[HCO₃⁻] = 4.28

Therefore, a [CO₃²⁻]/[HCO₃⁻] ratio of 4.28 is necessary to make a buffer with pH 11.00 using the bicarbonate ion0

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Explanation:

Hello

I answered all your questions And I explained it to you in the photo sent.

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The equilibrium constant (K) for the given reaction is 1.0 x 10²⁰(scientific notation).

The equilibrium constant (K) for the reaction between solid copper (Cu) and aqueous silver ions (Ag+) forming aqueous copper (II) ions (Cu2+) and solid silver (Ag) can be calculated using the standard reduction potentials of the half-reactions involved.

By comparing the reduction potentials of Cu2+/Cu and Ag+/Ag, we can determine the ratio of their concentrations at equilibrium, which corresponds to the equilibrium constant.

In this case, the equilibrium constant for the reaction is 1.0 x 10²⁰, indicating a highly favorable reaction towards the formation of Cu2+ and Ag from Cu and Ag+ ions.

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Light emission event: You watch fireworks burst in the sky.Light absorption event: Neither a light emission or absorption event- You notice your friend wearing a green MSU t-shirt.- You watch the sun setting on the horizon.- You're blinded by the neon lights walking down Main Street at night.- You admire the transitioning fall foliage along the

Red Cedar River.The observations given in the question can be classified as follows:1. Light emission event: You watch fireworks burst in the sky.2. Light absorption event: Neither a light emission or absorption event3. Neither a light

emission or absorption event: You notice your friend wearing a green MSU t-shirt, You watch the sun setting on the horizon, You're blinded by the neon lights walking down Main Street at night, You admire the transitioning fall foliage

along the Red Cedar River.The observations which are light emission events are the ones where light is produced, while light absorption events involve the absorption of light energy. The other observations do not involve any light emission or absorption event.

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Answer: 1.26 mol and 20.16g

Explanation:

use ideal gas law

PV = nRT

121.59 x 31 = n x 8.314 x 360.15

n = (121.59 x 31)/(8.314 x 360.15)

n = 1.26 mol

x MM CH4 = 20.16g