What mass in grams of hydrogen gas is produced if 20. 0 mol of zn are added to excess hydrochloric acid according to the equation




zn(s) +2hcl(aq) --> zncl₂(aq) + h₂(g)?

Answer:

The solution is made by adding 4.38 g NaCl to a 250-mL volumetric flask. About 100 mL of water are added and when all the NaCl dissolves water is added up ...

Answer:

have you tried to convert the energy into a simpler form to help

Explanation:

the numbers may be converted with the right equation

The formation of Na2O through the transfer of electrons is Illustrated.

The atom is made up of subatomic particles such as electrons, protons, and neutrons. The atom is made up of a central nucleus that contains neutrons and protons. The nucleus is surrounded by electrons. Electrons are negatively charged, while proton and neutron are positively charged. An electron is a negatively charged subatomic particle that can be bound to or free from an atom.

Because sodium requires two electrons to complete its octet, it transfers one electron to oxygen. To complete the octet, oxygen requires one more electron. As a result, another sodium atom donates its electron to the oxygen atom. Three ions that attract one another form the overall neutral-charge ionic compound.

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Answer:

no the rock was formed before the layers that we life on today

Explanation:

The Wittig reaction is a widely used organic synthesis technique that involves the reaction of a carbonyl compound such as an aldehyde or a ketone with a phosphonium salt to form an alkene.

Organic synthesis is the process of constructing organic molecules from simple, commercially available starting materials. This process involves a wide variety of reactions and techniques, such as condensation reactions, oxidation reactions, reduction reactions, cyclizations, rearrangements, and more.

The reaction is typically carried out in an ether solvent such as diethyl ether, and a base such as sodium hydroxide is added to assist with the reaction. 95% ethyl alcohol is then added to the reaction mixture to make the reaction more efficient. Iodine is also used in the reaction as a catalyst to enhance the reaction rate. The overall reaction results in the deprotonation of the phosphonium salt resulting in the formation of an alkene. (1)
Deviations from the published procedure include the use of a slightly different solvent in which to perform the reaction. Instead of using diethyl ether, which is the main solvent used in this reaction, a combination of diethyl ether and 95% ethyl alcohol is used to aid in the reaction. Additionally, the use of iodine as a catalyst is not mentioned in the original procedure, but it is commonly used to enhance the reaction rate.
In summary, the Wittig reaction involves the reaction of a carbonyl compound with a phosphonium salt in an ether solvent. Sodium hydroxide is used as a base to assist the reaction, while 95% ethyl alcohol is added to increase the reaction efficiency. Iodine is also used as a catalyst to enhance the reaction rate. Deviations from the published procedure include the use of a different solvent and the addition of iodine as a catalyst. (1)

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4°c, the temperature of maximum density for water.

Below that point, the crystalline lattice starts to form and the water begins to expand. The density decreases above that temperature as a result of the elevated molecular vibrational activity.

Temperature is a numerical expression of how hot a substance or radiation is. There are three different kinds of temperature scales: those that depend only on macroscopic properties and thermodynamic principles, like Kelvin's original definition; those that depend only on practical empirical properties of particulate matter rather than theoretical principles; and those that depend on the average translational kinetic energy per freely moving microscopic particle, such as an atom, molecule, or electron, in a body, like the SI scale.

A thermometer is used to determine temperature. It is calibrated using a variety of temperature scales, each of which has a distinct historical definition determined by a specific set of reference points and thermometric materials. The Celsius scale is the most widely used scale.

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Answer:

130

Explanation:

Maintain hot food at 135°F or above. Properly cooked roasts may be held at 130°F or above.

135°F is the minimum hot holding temperature for fried chicken. The most often used scales are indeed the Celsius scale.

Temperature is a physiological measure that quantifies our feelings of hotness and coolness. A thermometer is used to measure temperature.

Thermometers were calibrated in a variety of temperature scales that have traditionally been defined by various reference points including thermometric substances.

The most often used scales are indeed the Celsius scale, with the unit sign °C, the Fahrenheit level (°F), as well as the Scale parameter (K), with the latter being mostly used for scientific reasons. The kelvin is one of the International System of Units' seven basic units (SI). 135°F is the minimum hot holding temperature for fried chicken.

Therefore, 135°F is the minimum hot holding temperature for fried chicken.

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Answer:

atoms are everything and they are use to create anything and everything

Answer:

Atoms are composed of subatomic particles that are the building blocks of life

Answer: should be 28 degrees

Explanation:

The reaction releases 33.0 kJ/g of heat for each gram of reactant consumed. the mass of reactant that will produce 1.230 kJ of energy is 0.0373 g (approximately).

We have to calculate the mass of the reactant that will produce 1230 J (not kj).We must first convert 1230 J to kJ.1230 J = 1.230 kJ We have to calculate the mass of the reactant that will produce 1.230 kJ.Let the mass of the reactant be x grams.33.0 kJ/g is the energy released per gram of reactant consumed.

Therefore, for x grams of reactant, the energy released will be:33.0 kJ/g * x g = 33x kJ Now we have an equation which relates mass and energy:33x kJ = 1.230 kJ Dividing both sides by 33, we get: x = 1.230 kJ / 33 kJ/gx = 0.0373 g (approximately)Therefore, the mass of reactant that will produce 1.230 kJ of energy is 0.0373 g (approximately).

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The mass, in grams, of the sample of methanol (CH₃OH) is 64 grams.

Mass of any substance can be calculated by using moles as:

n = W/M, where

W = required mass

M = molar mass

In the question that:

Moles of methanol = 2mole

Molar mass of methanol = 32g/mole

On putting these values in the above equation, we get

W = n × M

W = 2mole × 32g/mole = 64g

Hence, 64 grams is the mass of the sample.

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Answer:

malleable

Explanation:

The image represent in malleable property of metal.

The image possibly represents the photoelectric effect of a metal, which is when it emits electrons after being exposed to electromagnetic radiation. Metals are also characterized by physical properties such as conductivity, malleability, metallic luster, and metallic bonding.

Based on your question, the image possibly represents the photoelectric effect, a key property of metals. This phenomenon occurs when a metal surface exposed to electromagnetic waves of a certain frequency absorbs radiation and emits electrons. These emitted electrons are called photoelectrons. Metals can also exhibit free electron model behavior, where electrons freely roam within the metal structure.

Metals possess unique physical properties like conductivity, malleability, and metallic luster. Malleability refers to the metal's ability to deform without breaking, while conductivity refers to the metal's ability to transfer heat or electricity. A metallic luster gives metals their characteristic shiny appearance.

Finally, metals are also known for their metallic bonding—a unique force that holds together the atoms within a metallic solid. Metallic bonding gives rise to many useful and varied bulk properties of metals.

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The correct answer is C. When magnesium and nitrogen react, they form a compound with the formula Mg3N2. In this compound, magnesium loses 2 electrons to form Mg2+ ions, while nitrogen gains 3 electrons to form N3- ions.

The lattice of the compound will be composed of Mg2+ and N3- ions, not Mg2- and N3+ ions as stated in option A. Option B is incorrect because the reaction between magnesium and nitrogen is actually exothermic, not endothermic. This means that energy is released during the reaction rather than absorbed. Option D is also incorrect because the melting point of Mg3N2 is actually lower than that of NaCl. This is due to the fact that Mg3N2 has a layered structure, which makes it easier for the layers to slide past each other and therefore melt at a lower temperature. In conclusion, option C is the correct answer because it accurately describes the electron transfer that occurs between magnesium and nitrogen during the formation of their compound.

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Answer:

Radiation

Explanation:

While being beside a campfire, the heat is transmitted by radiation from fire.  

number of moles = mass

molar mass

BaCO3 molar mass = 197.34 g/mol

mass = 10g

n = 10/197.34

n = 0.05moles.

The number of moles of barium carbonate used are 0.05moles.

Answer:

757.5 kPa

Explanation:

Boyle's law states that p1 * v1 = p2 * v2

v1 = 12 mL

v2 = 8 mL

p1 = 505 kPA

p2 = ?

(505)(12) = (p2)(8)

6060 = (p2)(8)

p2 = 757.5

The Solar weather affects the Earth's magnetosphere which is a threat to our magnetic protection and can cause turbulence.

The effect is like widening a hole—suddenly more energy and particles enter the magnetosphere. Auroras intensify, and geomagnetic storms become likely. For this reason, scientists pay careful attention to not only the strength but also the orientation of incoming magnetic fields from the sun. As the wind blows from the galaxy towards the earth it carries with it the Sun's magnetic field. It moves very fast, then smacks right into the Earth's magnetic field. The blow causes a shock to our magnetic protection, which can result in turbulence.

So we can conclude that: The Solar weather affects the Earth's magnetosphere which is a threat to our magnetic protection and can cause turbulence.

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Answer: A galvanic cell consists of two different metals (electrodes) connected through a conducting solution (an electrolyte) and also connected externally completing a circuit.

Answer : 58.44 g

The reaction

\(\tt Na+Cl\Rightarrow NaCl\)

mole ratio :

Na : Cl : NaCl = 1 : 1 : 1

Molar mass of Na : 22,989769 g/mol = 22.99 g/mol

Molar mass of Cl : 35,453 g/mol= 35.45 g/mol

Molar mass of NaCl : 58,44 g/mol

Let's check the mol for reactant (Na and Cl) and product(NaCl)

\(\tt mol=\dfrac{22.99}{22.99}=1\)

\(\tt mol=\dfrac{35.45}{35.45}=1\)

Then the reactants are completed reacting because it matches the mole ratio, which is 1: 1

so that the mole of the product can be determined from the mol Na or Cl, which is 1

\(\tt =\dfrac{mol~NaCl}{mol~Na}\times MW~NaCl\\\\=\dfrac{1}{1}\times 58.44\\\\=\boxed{\bold{58.44~g}}\)

Explanation:

The name for the compound PbO₂ is lead (IV) oxide. The oxidation state of lead is +4 and the oxidation state of oxygen is -2. Actualy the oxidation state of oxygen in oxides is always -2.

Answer: the oxidation state of O in PbO₂ is -2.

The oxidation number of oxygen in the compound PbO₂ is -2. The oxidation number of an atom can be positive, negative, or zero.

Let's assume that the oxidation number of lead (Pb) is x and the oxidation number of oxygen (O) is y. The compound PbO₂ is neutral, which means the sum of the oxidation numbers must be zero.

The oxidation number of Pb is known to be +4 because PbO₂ is lead dioxide, whereas oxygen is typically assigned an oxidation number of -2.

Thus,

(+4) + 2(y) = 0

4 + 2y = 0

2y = -4

y = -2

Therefore, the oxidation number of oxygen (O) in PbO₂ is -2.

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Answer:

D) 607.5 mL

Explanation:

Combined Gas Law: P1V1/T1=P2V2/T2

Substitute: [2.25(450)]300=[2.25(V)]/405

Solve for V: 3.375=2.25V/405

3.375(405)=2.25V

1366.875=2.25V

V=607.5 mL

Option c is correct. The interactive assumes substances change phase as temperature changes describe limitations or safety concerns of this interactive.

While temperature is a key element in determining a substance's condition, other parameters, including pressure, can also be very essential. The interactive's assumption that the reaction is a closed system raises another question about safety.

For instance, if the pressure is high enough, water can continue to be a liquid even at temperatures below its freezing point. Because of this, the interactive does not take into consideration how pressure affects the phase transition, which may restrict its accuracy in some circumstances.

Many phase changes actually take place in open systems where materials can be added or deleted. When water is being heated, some water vapor may escape and alter the system's qualities as well as the pace of boiling.

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Complete question

which of the statements describe limitations or safety concerns of this interactive?

a. boiling points must be carefully determined for liquids that are flammable, such as benzene.

b. the interactive assumes that the temperature of a solid can be easily measured using a temperature probe.

c. the interactive assumes substances change phase as temperature changes.

d.  the interactive assumes that the reaction is a closed system.

Answer: Your answer would be  D

Explanation: Sorry if i get it wrong ! (but good luck and make sure to rate)

Answer:

D

Explanation:

because when it is winter

a bear hibernates in a cave

and eats lots of food so it

dosent starve after sleeping

for such a while.

Hope this helps

plz mark brainliest

if you would be so kind!

bye!

The sweetest natural sugar that is found in fruits and vegetables is fructose. Fructose is a monosaccharide, or simple sugar, that is found in fruits, vegetables, and honey. It is known for its sweet taste and is often used as a natural sweetener.

Unlike glucose, which is quickly absorbed by the body and can cause a spike in blood sugar levels, fructose is absorbed more slowly, which makes it a better option for people who are looking to manage their blood sugar levels. Fructose is also a common ingredient in many processed foods, such as soft drinks and candy. While fructose is a natural sugar, it should still be consumed in moderation, as excessive consumption can lead to health problems, such as obesity and type 2 diabetes. Overall, fructose is the sweetest natural sugar found in fruits and vegetables, and is a good option for those who are looking for a natural sweetener that won't cause a spike in blood sugar levels.

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Answer: I think it's B

Answer:

Lead

Explanation:

Lead (Pb) is the end product of every natural radioactive series.

Answer:

B

Explanation:its the best answer

The most diverse offspring is produced when bees bringing pollen from the flower of one plant to the flower of another plant where, the new flower made will show a characteristic of both plants?

Pollination is the process of transferring pollen grains from the anther of the flower to the female stigma portion. This is a mechanism to create offsprings of the plants.

Pollination can be occurred through various agents such as insects, wind, water etc. Some plants contains both male and female flower within it and those are self pollinating.

Bees and butterflies are the main pollinating agents for plants. When they bring the pollen grains from one plant to another plant's flower the resulting offspring will have diverse properties which are mix of each plants.

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The density of the liquid is 0.79.

Density can be determined by the ratio of mass and volume of a particular substance. It can be denoted by the symbol d. The concept of density is crucial because it enables us to predict which compounds will float and which ones will sink in a liquid. As long as an object's density is lower than that of the liquid's density, it will often float.

Density can be determined by the formula:

Density = mass / volume.

Given data:

Volume = 35.20mL

Mass = 28.54 g

Put the values of given data in above formula:

Density = 28.20 / 35.54

Density = 0.79 m³

Therefore, the density of the liquid will be 0.79.

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The density of a liquid if a 35.2 mL sample has a mass of 28.548 g is 0.811 g/mL.

What is density?

Density is defined as the mass of the substance per unit of volume. It can be understood by the mass of a substance divided by its volume. Density is denoted using symbol ρ. Density of a liquid can be calculated by -

                                      ρ = m

                                             v

where,

ρ = density

m = mass

v = volume

Density is a physical property of a matter. Higher the density of a substance, higher will be its mass and volume. As long as an object's density is lower than that of the liquid's density, it will often float.

To calculate density of given liquid -

we have,

mass = 28.548 g

volume = 35.2 mL

Using the formula,

         Density =   mass  

                           volume

                    ρ = 28.548

                            35.2

                    ρ = 0.811 g/mL

Therefore, density of liquid is 0.811 g/mL or m³

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Always moving from anode to cathode, electrons. This is the transition from an oxidation to a reduction half cell. Electrons will switch from Fe²⁺ towards Cl₂ in this reaction.

The smallest elemental component of an atom, the electron has a negative charge. In a neutral atom, there are an equal amount of protons and electrons. One electron but one proton are all that the hydrogen atom has. The uranium atom, on the other hand, has 92 protons, which translates to 92 electrons.

Net reaction:

Cl₂ + 2Fe²⁺ → 2Cl⁻ + 2Fe³⁺

Oxidation state:

0        +2         -1         +3

Because Cl's oxidation state is shifting form 0 to -1. Cl₂ is thus transformed into Cl. Fe²⁺ is oxidising to Fe³⁺ as the oxidation number of Fe changes from +2 to +3.

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