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After 30 minutes of being in vinegar, the penny will be covered in a thin layer of copper oxide.

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In this question, we have to use Graham's law of effusion in order to find the molar mass of this unknown gas, the formula is the following:

r1/r2 = √ M2/M1

Where:

r1 = rate of gas 1, in this case oxygen, 625 m/sec

r2 = rate of gas 2, unknown gas, 425 m/sec

M1 = molar mass of gas 1, oxygen, 32g/mol

M2 = molar mass of gas 2, unknown

Adding the values into the formula:

625/425 = √ M2/32

1.47 = √ M2/32

(1.47)^2 = M2/32

2.16 = M2/32

M2 = 32 * 2.16

M2 = 69.12g/mol is the molar mass of this gas

The Process of Animal Pollination. Pollinators come to flowers in search of food (nectar and pollen). During a flower visit, a pollinator may unintentionally brush up against the flower's reproductive parts, depositing pollen from another flower. The pollen is then used by the plant to produce a fruit or seed.

The smaller value of x is the limiting factor, so we can conclude that 6.02 moles of H₃PO₄can form during the reaction.

From the given information, we know that 2.0 mol P₄O₁₀ can form 8.0 mol H₃PO₄. Therefore, if we have x moles of H₃PO₄, we would need 0.25x moles of P₄O₁₀.

We also know that 8.0 mol H2O can form 5.3 mol H₃PO₄. Therefore, if we have x moles of H₃PO₄, we would need (8/5.3)x moles of H₂O

Since we need to use the limiting reactant to determine the amount of product formed, we can set up an inequality:

0.25x ≤ 2.0 (the amount of P₄O₁₀ available)

(8/5.3)x ≤ 8.0 (the amount of H₂O available)

Solving for x in both cases, we get:

x ≤ 8.0 (from the P₄O₁₀ reaction)

x ≤ 6.02 (from the H₂O reaction)

The smaller value of x is the limiting factor, so we can conclude that 6.02 moles of H₃PO₄ can form during the reaction.

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Answer:

Explanation: false

Nonpolar covalent bonds form between two atoms of the same element, or between atoms of different elements that share electrons more or less equally.

Answer and Explanation:

When two atoms form a chemical bond, they either share electrons or transfer them to make a new compound. Electrons are the negatively charged particles that orbit the nucleus of an atom in various energy levels.

Answer:

when heated to incandescence, calcium nitrate decomp into /nitrogen oxide, calcium oxide and oxygen/

Explanation:

Answer:

Explanation:

Do you mean what elements is Ca(NO3)2 made from? I think that's what you mean. Every mol of Ca(NO3) contains

Ca = 1 mol

N = 2 mols

O6 = six moles of oxygen

To calculate the volume of a CO2 cartridge, we can use the ideal gas law equation:

PV = nRT

Where:

P = pressure (in Pascals)

V = volume (in cubic meters)

n = number of moles

R = ideal gas constant (8.314 J/(mol·K))

T = temperature (in Kelvin)

First, we need to convert the given values to the appropriate units.

The pressure of 850 PSI needs to be converted to Pascals:

1 PSI = 6894.76 Pascal

So, 850 PSI = 850 * 6894.76 Pascal = 5867756 Pascal

The temperature of 21ºC needs to be converted to Kelvin:

T(K) = T(ºC) + 273.15

T(K) = 21ºC + 273.15 = 294.15 K

Now, we can plug these values into the ideal gas law equation and solve for V:

V = (nRT) / P

V = (0.273 mol * 8.314 J/(mol·K) * 294.15 K) / 5867756 Pascal

Calculating this expression, we find:

V ≈ 0.001368 m^3

Therefore, the volume of the CO2 cartridge is approximately 0.001368 cubic meters.

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Answer:

I hate to not answer and have you repost this if you could repost it with the choices by clicking the arrow I can figure it out a lot faster and I'll copy and paste to show you that it's right

Explanation:

I'm good with history biology sum math so if you want to do what I asked and reposted I can give you the answers and I will show that they are correct I won't just guess like some people do just to get points cuz I don't care about points I just get on here to help people

Answer: The answer for the blanks is initial appearance and than final appearance.

Explanation:

When the volume of a gas is changed from 3.75 L to 6.52 L, the temperature will change from 65.0 °C to °C. T = 173.87K

Gay-law, Lussac's which was found in 1808 and published in 1809, is the term used to describe Joseph-Louis Gay-law Lussac's of combining volumes of gases. It can also mean the ratio of a gas's volume to its absolute temperature at a certain pressure.

From the question:

V1 initial volume = 3.75 L

V2 =final volume= = 6.52 L

T1 (initial temperature) = 100 K

T2 (final temperature) =

V1/T1 = V2/T2

(3.75/100) = 6.52/T2

then we  have

T2 = 6.52/ 3.75

=173.87K.

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The statement is FALSE. Non-ferrous metals can be hardened by heat treatment, although the mechanisms and processes involved may differ from ferrous metals.

Heat treatment techniques such as precipitation hardening can be used to increase the strength of non-ferrous metals. Non-ferrous metals are metals or alloys that do not include iron (or iron allotropes, such as ferrite, etc.) in significant quantities. Non-ferrous metals are employed because they have desired qualities like reduced weight (for example, aluminium), greater conductivity (for example, copper), non-magnetic characteristics, or corrosion resistance (for example, zinc), even though they are often more expensive than ferrous metals. In the iron and steel sectors, several non-ferrous materials are also employed. Bauxite, for instance, is used as a flux in blast furnaces, whereas wolframite, pyrolusite, and chromite are utilised to create ferrous alloys.

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Answer

To convert μg/l to mol/kg?

Step 1: from the mass in grams, find the number of moles by diving the mass by its molar mass

Step 2: To go from L to kg, take the volume given multiply it by density in kg/L

C₃H₄O. is the molecular formula for this substance.

Given :

Percentage of hydrogen = 7.14%

Percentage of carbon = 64.3%

Percentage of oxygen = 28.6%

To find Empirical formula

Number of gram atoms of H = 7.14 / 1.01 = 7.1

Number of gram atoms of O = 28.6 / 16 = 1.8

Number of gram atoms of C = 64.3 / 12 = 5.4

Atomic ratio:

           C                  :         H            :         O

        5.4/1.8             :      7.1/1.8       :       1.8/1.8

           3                   :        4            :        1

C : H : O = 3 : 4 : 1

Empirical formula is C₃H₄O.

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The types of IMFs (intermolecular forces) that a molecule can engage in a pure sample depend on the molecular structure and polarity.

The types of IMFs (intermolecular forces) that a molecule can engage in a pure sample depend on the molecular structure and polarity. In the given options, the molecule can engage in dispersion and dipole-dipole interactions. Dispersion forces are the weakest IMFs and occur between all molecules, regardless of polarity. Dipole-dipole interactions occur between polar molecules with a permanent dipole moment. If the molecule in question is nonpolar, it can only engage in dispersion forces. If the molecule is polar, it can also engage in dipole-dipole interactions. If the molecule has hydrogen atoms bonded to highly electronegative atoms such as nitrogen, oxygen, or fluorine, it can also engage in hydrogen bonding, which is the strongest type of IMF. Therefore, the correct answer to the given question would be dispersion and dipole-dipole. It is important to note that the strength of IMFs affects the physical properties of the substance, such as boiling and melting points, solubility, and viscosity.

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The number of ionic bond in copper is zero.

Pure copper or any pure metal for that matter are examples of metallic bonds, which are neither ionic nor covalent. The copper atoms are stacked very tightly in a solid lattice. In fact it has a face centered cubic lattice which is the closed packing of atoms possible. Each atom has twelve nearest neighbors which allows their 4s orbitals (mostly) to have the optimal overlap. All of these orbitals therefore combine in one gigantic band of delocalized orbitals that spans the entire crystal with its myriad atoms. This band is only partly filled and the difference in energy between one state and the next is puny, which explains copper’s outstanding conductive properties.

Therefore, the bonding in copper has a metallic character.

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Answer: solid liquid and gas

Explanation: the diffrent types of objects/things

Answer:

Check this.

THANK YOU ..

The empirical formula of oxide of iron is Fe2O2 and its name is iron oxide.

Given:

Solution:

Now, calculate the relative mass of iron in iron oxide = Percentage of iron by mass / At. mass of iron

Relative mass of iron = 77.75/55.85 = 1.39

Relative mass of oxygen = Percentage of oxygen by mass / At. mass of iron = 22.25/16 = 1.39

Now the calculate the molar ratio of iron to oxygen = 1.39 : 1.39 = 2:2

Thus, the empirical formula of iron oxide is Fe2O2 and its name is iron oxide.

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Answer:

m = 0.0035 m.

Explanation:

Hello there!

In this case, since the formula for the computation of the molality is:

\(m=\frac{n_{solute}}{m_{solvent}}\)

We can first compute the moles of solute, K3PO4 by using its molar mass:

\(n=30mgK_3PO_4*\frac{1gK_3PO_4}{1000gK_3PO_4}*\frac{1molK_3PO_4}{212.27gK_3PO_4} =1.41x10^{-4}mol\)

Next, since the volume of water is 40.0 mL and its density is 1.00 g/mL we infer we have the same grams (40.0 g). Thus, we obtain the following molality by making sure we use the mass of water in kilograms (0.04000kg):

\(m=\frac{1.41x10^{-4}mol}{0.0400kg}\\\\m=0.0035m\)

In molal units (m=mol/kg).

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True , A catalyst is a substance that quickens a chemical reaction; therefore, in homogeneous catalysis, the catalyst and reactants are in the same phase. Most of the time, everything will exist as a gas or be contained within a single liquid phase.

The difference between heterogeneous and homogeneous catalysts is that the former are in the same phase as the latter are not.

A single phase is what is meant by the notion of a pure substance or homogenous mixture. There are two or more phases in a heterogeneous mixture. Water and oil do not mix uniformly when combined; instead, two distinct layers are created.

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Answer + Explanations

Calculate heat absorption using the formula:

Q = mc∆T

Q means the heat absorbed, m is the mass of the substance absorbing heat, c is the specific heat capacity and ∆T is the change in temperature.

The heat absorbed is calculated by using the specific heat of water and the equation ΔH=cp×m×ΔT. 4. Water is vaporized to steam at 100oC. The heat absorbed is calculated by multiplying the moles of water by the molar heat of vaporization.

You can do this easily: just multiply the heat capacity of the substance you're heating by the mass of the substance and the change in temperature to find the heat absorbed.

To calculate the amount of heat released in a chemical reaction, use the equation Q = mc ΔT, where Q is the heat energy transferred (in joules), m is the mass of the liquid being heated (in kilograms), c is the specific heat capacity of the liquid (joule per kilogram degrees Celsius), and ΔT is the change in ...

Q = mc∆T. Q = heat energy (Joules, J) m = mass of a substance (kg) c = specific heat (units J/kg∙K) ∆ is a symbol meaning "the change in"

Precisely, water has to absorb 4,184 Joules of heat (1 calorie) for the temperature of one kilogram of water to increase 1°C. For comparison sake, it only takes 385 Joules of heat to raise 1 kilogram of copper 1°C.

A reaction that absorbs heat is endothermic. Its enthalpy will be positive, and it will cool down its surroundings. This reaction is exothermic (negative enthalpy, release of heat).

Quantitative experiments show that 4.18 Joules of heat energy are required to raise the temperature of 1g of water by 1°C. Thus, a liter (1000g) of water that increased from 24 to 25°C has absorbed 4.18 J/g°C x 1000g x 1°C or 4180 Joules of energy.

Answer:

It is quite known that in case of electrolyte there are no electrons. The electric current is basically due to flow of ions.

Liquids don't have a definite shape and occupy a fixed volume. They are substances that exist in the liquid state. They take the form of their containers and are slightly compressible. Gases (materials that are in the gaseous state) don't have a fixed shape or take up a set amount of space.

The variations in their molecules account for these many states of matter. Solids, for instance, have a distinct shape and dimension. Liquids, on the other hand, can bend and will conform to the shape of the container they are in. Finally, gases disperse to entirely occupy the space that is accessible. Liquids don't have a definite shape and occupy a fixed volume. They are substances that exist in the liquid state. They take the form of their containers and are slightly compressible. Gases (materials that are in the gaseous form) don't have a defined shape or take up a certain amount of space.

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The mass percent of the solution is 5.43%.

It can be calculated by dividing the mass of the solute (NaOH) by the mass of the solution (NaOH + H₂O) and multiplying by 100.

The mass of the solution is the sum of the mass of the solute (NaOH) and the solvent (H₂O).

Mass of NaOH = 27.5 g

Mass of H₂O = 479 g

Mass of solution = Mass of NaOH + Mass of H₂O

= 27.5 g + 479 g

= 506.5 g

Now, we can calculate the mass percent of the solution:

Mass percent = (Mass of NaOH / Mass of solution) x 100%

          = (27.5 g / 506.5 g) x 100%

          = 5.43%

Therefore, the mass percent of the solution is 5.43%.

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Taking into account the definition of density, the density of the pen is 1.8523 g/mL.

Density is defined as the property that matter, whether solid, liquid or gas, has to compress into a given space and it is a quantity that allows to measure the amount of mass in a certain volume of a substance.

The expression for the calculation of density is:

density= mass÷ volume

From this expression it can be deduced that density is inversely proportional to volume.

In this case, you know that:

Replacing in the definition of density:

density= mass of the pen÷ volume of the pen

density= 24.08 g÷ 13 mL

Solving:

density= 1.8523 g/mL

In summary, the density of the pen is 1.8523 g/mL.

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The term used to denote the concentration of electrolytes in a given volume is "molarity".

Molarity-

Molarity is the number of moles of solute dissolved in one liter of the solution. Molarity is the most widely used concentration metric in chemistry, and it is frequently denoted by "M." It denotes the amount of solute in moles per liter of solution.

A solution's molarity can be calculated using the following formula:

Molarity = moles of solute / liters of solution

Molarity is often used to express the concentration of a solution's electrolytes because electrolytes break into ions when dissolved in a solvent, allowing for electrical conductivity.

Molarity can be used in other applications, such as stoichiometry, which involves determining how much of one compound is required to react completely with another.

Molarity is a useful tool for solving problems that involve chemical reactions since the number of moles of a substance is frequently used to establish reaction ratios, limit reactants, and determine the theoretical yield.

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The compound formed when magnesium oxide reacts with water is magnesium hydroxide (Mg(OH)₂).

Magnesium oxide (MgO) is an ionic compound consisting of magnesium cations (Mg²⁺) and oxide anions (O²⁻). When it reacts with water (H₂O), the oxygen atom in water attracts the magnesium cation, leading to the formation of magnesium hydroxide.

The reaction can be represented as follows:

MgO + H₂O → Mg(OH)₂

In the resulting compound, magnesium hydroxide, there are two hydroxide ions (OH-) for every magnesium ion (Mg²⁺). The chemical formula Mg(OH)₂ represents this ratio.

Magnesium hydroxide is an alkaline compound and is commonly used as an antacid to treat heartburn and indigestion. It is also used in various industrial applications.

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Answer:  \(CaCO_3(s)\rightarrow CaO(s)+CO_2(g)\) , 0.533 L

Explanation:

According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.

\(CaCO_3(s)\rightarrow CaO(s)+CO_2(g)\)

According to avogadro's law, 1 mole of every substance occupies 22.4 L of volume at STP.

Number of moles =\(\frac{\text {given mass}}{\text {Molar mass}}\)

moles of calcium carbonate = \(\frac{2.38g}{100g/mol}=0.0238mol\)

As 1 mole of calcium carbonate produces = 22.4 L of carbon dioxide at STP

Thus 0.0238 moles of calcium carbonate produces =\(\frac{22.4 L}{1}\times 0.0238=0.533L\) of carbon dioxide at STP

The balanced equation is \(CaCO_3(s) \rightarrow CaO(s) + CO_2(g)\)

The number of liters of carbon dioxide that should be produced is 0.533L

As per this law, the mass could neither be developed nor be destroyed. So, the mass of products should be equivalent to the mass of reactants. The number of atoms of every element has to be the similar on reactant and product sides. Due to this, the chemical equations are balanced.

\(CaCO_3(s) \rightarrow CaO(s) + CO_2(g)\)

As per this law,  1 mole of every substance occupies 22.4 L of volume at STP.

So,

We know that

Number of moles = \(given\ mass \div molar\ mass\)

Now the moles of calcium carbonate is \(= 2.38 \div 100\) = 0.0238 mol

Since 1 mole of calcium carbonate generated = 22.4 L of carbon dioxide at STP

So, 0.0238 moles of calcium carbonate generated

\(= 22.4 \div 1 \times 0.0238 \\\\= 0.533L\)

 of carbon dioxide at STP

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The mass of ammonia that can be produced from the reaction of 74.2 g of N₂ and 14.0 moles of H₂ is 90.1 g.

The mole ratio of the reaction for the production of ammonia is obtained from the balanced equation of the reaction as follows:

Equation of the reaction: N₂ (g) + 3 H₂ (g) → 2 NH₃ (g)

The mole ratio of the reactants nitrogen and hydrogen is 1 : 3

Moles of nitrogen in 74.2 g of nitrogen = 74.2/28

Moles of nitrogen in 74.2 g of nitrogen = 2.65 moles

Moles of hydrogen present = 14.0 moles

The limiting reactant is nitrogen

Mole ratio of nitrogen to ammonia is 1 : 2

Mass of ammonia produced = 2.65 * 2 * 17 g

Mass of ammonia produced =  90.1 g

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Answer:

1 C₈H₂₀ + 13 O₂ → 8 CO₂ + 10 H₂O

Explanation:

When balancing chemical equations, looking for the compound that looks the hardest and put a 1 in front of it.

In this case, it would be C₈H₂₀. Put a 1 in front of it.

Now, let's look at the reactants.

C - 8

H - 20

O - 2

Let's look at the products.

C - 1

O - 3

H - 2

To balance the carbons, put 8 in front of CO₂. To balance the hydrogens, put 10 in front of H₂O.

Now to balance the oxygens. There are 16 oxygen atoms in CO₂ and 10 oxygen atoms in  H₂O for a total of 26 oxygen atoms in the products.

To balance the oxygens, put 13 in front of O₂ in the reactants.

The equation is balanced.

Hope that helps.