ZnO can be separated by heat into zinc and oxygen gas. How much zinc can be collected from a 25g sample of ZnO?

Answer:

The Forces that form each star would be your answer :)

Answer:

Explanation:

Similarities.

Both Ionic and covalents bond produce exothermic reactions.

They are both neutral.in Ionic bonds, the two opposite charge will terminate each other and in covalent, the neutral molecules tend to share electrons.

Difference

Ionic bonds have high polarity while covalent have low.

Ionic bonds have no definite shape, covalent have.

Ionic have high melting points, covalent have low.

Io ic have high boiling point, covalents have low.

Answer:

40

Explanation:

D=600

S=40

T=15

600/15 = 40

The arbitrary assignment of the reduction of Zn2+(aq) to Zn(s) as E = 0 V serves as a reference point for determining the relative reduction potentials of other redox reactions. This assignment is based on the convention that the standard reduction potential

In the case of the Zn2+(aq) to Zn(s) reduction, the reaction involves the gain of two electrons by Zn2+ ions, leading to the formation of solid zinc metal. The assigned reduction potential of 0 V indicates that, under standard conditions (1 M concentration, 25°C, and 1 atm pressure), the Zn2+ ions have a tendency to accept electrons and be reduced to Zn metal.

Any reduction potential above 0 V suggests a greater tendency for reduction, while a negative reduction potential indicates a lower tendency for reduction compared to the Zn2+(aq) to Zn(s) reaction.

This reference potential allows us to compare the reactivity of other redox systems and predict the feasibility of different reactions. The more positive the reduction potential, the greater the tendency for reduction to occur. Therefore, if we encounter a reduction potential of +0.34 V for another reaction, we can infer that it is more likely to occur spontaneously compared to the Zn2+(aq) to Zn(s) reduction. Conversely, if we encounter a reduction potential of -0.50 V, we can conclude that the reverse reaction (oxidation) is more favorable than the reduction of Zn2+(aq) to Zn(s).

Overall, the assignment of E = 0 V for the reduction of Zn2+(aq) to Zn(s) provides a benchmark for understanding the electrochemical behavior of other redox reactions and allows us to make predictions based on the relative reduction potentials.

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Answer:

1.3 mL

Explanation:

First, get the density of the olive oil, which is 0.917 kg/mL. Then divide the mass by the density:

1.2kg/0.917kg/mL= 1.3086150491 mL. The kg cancel out, leaving us with mL.

It should have 2 significant figures, because 1.2kg has 2 and we are dividing.

The volume of olive oil will be nearly 1300mL or 1.30 L as per the given data.

Volume is a measurement of three-dimensional space that is occupied. It is frequently numerically quantified using SI derived units or various imperial units. The definition of length is linked to the definition of volume.

Volume is, at its most basic, a measure of space. The units liters (L) and milliliters (mL) are used to measure the volume of a liquid, also known as capacity.

This measurement is done with graduated cylinders, beakers, and Erlenmeyer flasks.

Here, it is given that mass of olive oil is 1.2kg.

We know that,

Density of olive oil = 0.917kg/l.

Volume = mass/density

Volume = 1.2/0.917.

Volume = 1.30 lit.

Volume = 1300mL.

Thus, the volume of olive oil will be 1300 mL.

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Answer:

The correct option is C.

Note the full question and structure of the moleculesis found in the attachment below.

Explanation:

Triglycerides or triacylglycerols are non-polar, hydrophobic lipid molecules composed of three fatty acids linked by ester bonds to a molecule of glycerol.

The fatty acids linked to the glycerol molecule are denoted by R and may be of the same kind or different. when the R group is the same, the R is attached in all the three positions for ester bonding in the glycerol molecule but when they are different are denoted by R, R' and R'' respectively.

During the hydrolysis of triglycerides, the three fatty acids molecules are obtained as well as a glycerol molecule.

From the question, when 1 mole of the triglyceride is hydrolysed, 2 moles of RCOOH, 1 mole of R'COOH and 1 mole of glycerol is obtained. The triglyceride must then be composed of two fatty acids which are the same denoted by R, and a different fatty acid molecule denoted by R'.

The correct option therefore, is C

Rubbing alcohol's molarity and molality can both be represented as 9.2 M and 39 m, respectively.

Divide by the milliliters to litres conversion factor. 250 mL of the example solution contain 0.17 moles of ethanol. There are 1000 mL in a litre, and moles per litre are the unit of molarity. There are 0.17 moles in 0.25 liters after dividing 250 milliliters by 1000 milliliters per liter.

Hard surfaces can be cleaned and disinfected with rubbing alcohol. Most pathogens are resistant to it, but not all of them. Isopropyl alcohol serves as rubbing alcohol's primary component (IA).

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Answer:

Verdadero

Explanation:

el ATP es una molécula orgánica que a porta energía a

A bouncing ball gradually stops bouncing because its energy is converted to heat energy.

According to the law of conservation of energy, energy is neither created nor destroyed but can be transformed from one form to another.

When a ball is bouncing up and down, we notice that the ball will slow down gradually. This is because, the energy in the bouncing ball is transferred to the small air molecules inside the ball as heat. Hence, the ball looses energy consistently until it comes to a stop.

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Answer:

A. The reaction shifts to the right (products) and the concentrations of I and H₂ decrease.

Explanation:

If gas is removed from the system at equilibrium, the system will try to compensate for the loss by shifting the reaction in a direction that produces more gas molecules. This is known as Le Chatelier's principle, which states that a system at equilibrium will respond to a disturbance by shifting in a way that minimizes the effect of the disturbance.

In this case, since gas is being removed from the system, the reaction will shift to the side that produces more gas molecules. Looking at the balanced equation, we can see that 2HI(g) has a greater number of gas molecules compared to H₂(g) and I₂(g). Therefore, the system will shift to the right (products) to produce more HI(g) and reestablish equilibrium.

Th correct answer is 28 g/mol

Given,

mass of the gas = 800 cm³ = 0.8 m

1 mole of gas at STP is 22.4

We know,

If, 1 mole Q occupies 22400 cm

Then, x mole occupies 800 cm³

x = 800/22400

= 0.036mol

Molar mass = Mass ÷ Mole

                   = 1 ÷ 0.036

Molar mass = 28 g/mol

Therefore, the molar mass of Q is 28 g/mol.

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The word "symptom" refers to a specific manifestation or indication of a condition, disease, or disorder that is experienced or observed by an individual.

Symptoms are subjective or objective changes in the body's normal functioning that may be recognized as abnormal, uncomfortable, or problematic. Symptoms can manifest in various ways depending on the nature of the underlying condition. They can be physical, such as pain, rash, cough, fever, or fatigue, indicating an illness or injury affecting the body. Symptoms can also be psychological, such as anxiety, depression, or confusion, reflecting disturbances in mental health.

Symptoms serve as important clues for medical professionals to identify and diagnose diseases or disorders. They provide valuable information about the nature, severity, and progression of an illness, helping healthcare providers formulate appropriate treatment plans. Additionally, symptoms may also be important for individuals to self-assess their own health status and seek appropriate medical attention.

It is essential to note that symptoms alone may not provide a definitive diagnosis, as they can overlap across different conditions. Further evaluation, including medical tests and examinations, is often necessary to confirm a diagnosis and determine the appropriate course of action.

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The area of a rectangle that is 2.1- cm wide by 5.6- cm long is 11.76cm² in two significant figures.

Area is the measure of the extent of a surface. It is measured in square units.

The area of a rectangle can be calculated by multiplying the length of the rectangle by its width.

According to this question, a rectangle that is 2.1- cm wide by 5.6- cm long has an area of;

Area = 2.1cm × 5.6cm

Area = 11.76cm² (2s.f)

Therefore, the area of a rectangle that is 2.1- cm wide by 5.6- cm long is 11.76cm² in two significant figures.

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The expression for the pressure of an ideal gas by means of kinetic theory is P = J / V.

According to the kinetic theory, a gas is made up of numerous submicroscopic particles (atoms or molecules), all of which are moving randomly and continuously. The container's walls and the quickly moving particles constantly collide in this situation.

It should be noted that based on the information, the formula illustrated will be:

f² = u²+ v² + w²

p = mv

where P = momentum

m = mass

v = velocity

Time = Distance / Speed

Force = mass × velocity² / distance

Pressure = force / area

J = mn

P = J/V

where

J = total mass

V = total volume

p = density of gas.

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Types of luminous flames:

1. Yellow Luminous Flame

2. Smoky Luminous Flame

3. Orange Luminous Flame

4. Blue Luminous Flame

Luminous flames are characterized by their visible glow, which is caused by the incomplete combustion of fuel. The presence of soot particles in the flame causes the emission of light. There are different types of luminous flames, which can be classified based on their fuel composition and burning conditions. Here are some common types of luminous flames:

1. Yellow Luminous Flame: This is the most common type of luminous flame, often seen in open fires, candles, and gas stoves. It appears yellow due to the presence of soot particles in the flame. Yellow flames indicate incomplete combustion of hydrocarbon fuels, such as methane, propane, or natural gas. The high carbon content in these fuels leads to the formation of soot, which emits visible light.

2. Smoky Luminous Flame: This type of flame is characterized by a significant amount of black smoke and soot production. It is commonly observed in poorly adjusted or malfunctioning burners or engines. The excessive presence of unburned fuel in the flame results in incomplete combustion and the emission of dark smoke particles.

3. Orange Luminous Flame: An orange flame indicates a higher combustion temperature compared to a yellow flame. It is often seen in more efficient burners or when burning fuels with a higher carbon content, such as oil or diesel. The higher temperature helps in burning more of the carbon particles, reducing the amount of soot and making the flame appear less yellow.

4. Blue Luminous Flame: A blue flame is typically associated with complete combustion. It indicates efficient burning of fuel, resulting in minimal soot formation. Blue flames are commonly observed in gas burners or Bunsen burners. The blue color is a result of the combustion of gases, such as methane, in the presence of sufficient oxygen.

It's important to note that the luminosity of a flame can vary depending on factors such as fuel-air mixture, combustion temperature, and the presence of impurities. Achieving complete combustion and minimizing the production of soot is desirable for efficient and cleaner burning processes.

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The Heat move : Heat always moves from the warmer substance to the cooler substance.

The heat always moves from hotter to cooler object. when object are of different temperature comes in contact with the heat will transfer. heat always moves from cooler to hotter. this process is called as conduction. if you will touch something that is hot you will feel the heat. The heat moves in ways : conduction , convention and radiation. These are the three ways of heat transfer from one object to another object.

Thus, The Heat move : Heat always moves from the warmer substance to the cooler substance.

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Explanation:

Given that,

Volume of a hallow glass sphere is 350 mL

Specific gravity is 1.252

We need to find the weight of the sphere. The ratio of density of substance to the density of water is called specific gravity.

The density of water is 1 g/mL

\(\text{specific gravity}=\dfrac{\text{density of substance}}{\text{density of water}}\\\\SG=\dfrac{m}{V\times \rho_w}\\\\m=SG\times V\times \rho_w\\\\m=1.252\times 350\ mL\times 1\ g/mL\\\\m=438.2\ \text{grams}\)

We know that,

1 pound = 453.592 grams

So,

m = 0.97 lbs

So, the weight of the sphere is 0.97 lbs or 0.97 pounds.

Answer:

D

Explanation:

The valence electrons are the outer electrons and must be located in the outermost shell. In this case, D.

Normality of a solution of sulfuric acid (H2SO4) that containing 86 g

per liter of solution is 1N

The gram equivalent weight of a solute per liter of solution is what is known as a solution's normalcy. The comparable concentration is another name for it. The units of concentration are denoted by the symbols N, eq/L, or meq/L (= 0.001 N). A hydrochloric acid solution's concentration, for instance, could be stated as 0.1 N HCl. The reactive capacity of a specific chemical species is measured by gram equivalent weight or equivalent (ion, molecule, etc.). Utilizing the chemical species' molecular weight and valence, the equivalent value is calculated. The only concentration unit that is reaction-dependent is normality.

g equivalent mass of H2SO4 = 86g

Volume of solution in liter = 1 l

number of g equivalent of H2SO4 = 86/86 = 1

Normality = number of g equivalent/ volume of solution in liter

N = 1 / 1

Normality = 1 N

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Answer:

you will taste the flavour of the food

A pH of 4 is ten times more acidic than a pH of 5.

Yes, pH can have decimal values. In fact, pH values can range from 0 to 14 and can have any value between them including decimals. pH is a measure of the acidity or alkalinity of a solution, and it is determined by the concentration of hydrogen ions (H+) in the solution.A solution with a pH of 7 is neutral, which means that it has an equal concentration of hydrogen ions (H+) and hydroxide ions (OH-). An acidic solution has a pH below 7 and a high concentration of H+ ions. On the other hand, an alkaline solution has a pH above 7 and a low concentration of H+ ions.A pH that is less than 7.0 indicates acidity. pH less than 7.0 is acidic while pH greater than 7.0 is alkaline. Each number on the pH scale represents a ten-fold change in the acidity/alkalinity of the solution. For example, a pH of 5 is 10 times more acidic than a pH of 6, and 100 times more acidic than a pH of 7.A pH of 0 indicates a very strong acidic solution while a pH of 14 indicates a very strong alkaline solution. It's worth noting that pH is a logarithmic scale, meaning that a change of one pH unit corresponds to a ten-fold change in hydrogen ion concentration.

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Potassium citrate (also known as tripotassium citrate) is a potassium salt of citric acid with the molecular formula K3C6H5O7.

Given the following parameters

Mass of hydrazine = 19.3 grams

Determine the moles of hydrazine

According to the Avogadro's constant

Therefore the total atoms that are there in 19.3 g of hydrazine is 3.87 * 10^23 atoms

Nitrogen G is a colorless, tasteless gas that is the most plentiful element in Earth's atmosphere and is a constituent of all living matter of nitrogen.

Nitrogen is an essential gaseous element with an atomic number of 7 and an atomic weight of 14.0067. Nitrogen gas has two particles of Nitrogen therefore, the molecular formula of this gas is N2. It is a non-metallic element that settled Group 15

nitrogen. [ nī′trə-jən ] N. A nonmetallic element that constructs up about 78 percent of the atmosphere by capacity, Nitrogen is a nonmetal and the lightest member of group 15 of the periodic table

So we can conclude that Nitrogen is the chemical element with the symbol N and atomic number 7.

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The balanced net ionic equation for the reaction between potassium sulfide and lead(II) nitrate is Pb²⁺(aq) + S²⁻(aq) → PbS(s)

From the question, we are to write the balanced net ionic equation for the given chemical reaction.

The given chemical reaction is

K₂S(aq) + Pb(NO₃)₂(aq) →

The between potassium sulfide and lead(II) nitrate will produce potassium nitrate and lead sulfide.

That is,

K₂S(aq) + Pb(NO₃)₂(aq) → KNO₃(aq) + PbS(s)

Now, balance the equation

K₂S(aq) + Pb(NO₃)₂(aq) → 2KNO₃(aq) + PbS(s)

Write the complete ionic equation

2K⁺(aq) + S²⁻(aq) + Pb²⁺(aq) + 2NO₃⁻(aq)  → 2K⁺(aq) + 2NO₃⁻(aq) + PbS(s)

Cancel out the spectator ions

S²⁻(aq) + Pb²⁺(aq)   → + PbS(s)

Hence, the balanced net ionic equation is

Pb²⁺(aq) + S²⁻(aq) → PbS(s)

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Answer:

0.016 m³

Explanation:

Step 1: Given data

Width of the tank (w): 18 in

Height of the tank (h): 11 in

Depth of the tank (d): 5 in

Step 2: Calculate the volume of the tank in in³

The fuel tank is a cuboid. We can calculate its volume using the following expression.

V = w × h × d

V = 18 in × 11 in × 5 in

V = 990 in³

Step 3: Convert 990 in³ to m³

We will use the relationship 1 m³ = 61023.7 in³.

990 in³ × (1 m³ / 61023.7 in³) = 0.016 m³

The electron configuration 1s22s22p6 corresponds to the noble gas neon (Ne), which has a completely filled valence shell.

What is Electric Configuration?

The placement of electrons around the nucleus of a specific atom or molecule is known as its electronic configuration.

Protons, neutrons, and electrons are the minuscule components that make up an atom. There are the same number of protons and electrons in a neutral atom. The quantity and location of an atom's electrons are revealed by its electronic configuration.

We say that electrons orbit the nucleus of an atom, like the rings of Saturn orbit the planet. Electrons move in orbitals that can accommodate a specific number of electrons as they circle the nucleus.

Four elements that may have ions with this electron configuration are:

Fluorine (F-) - gains one electron to achieve a noble gas configuration (1s22s22p6)

Oxygen (O2-) - gains two electrons to achieve a noble gas configuration (1s22s22p6)

Sodium (Na+) - loses one electron from the valence shell to achieve a noble gas configuration (1s22s22p6)

Magnesium (Mg2+) - loses two electrons from the valence shell to achieve a noble gas configuration (1s22s22p6)

Therefore, the symbols for these ions are:

Na+, Mg2+, F-, O2-.

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