Question 4(Multiple Choice Worth 4 points)
(05.05 MC)
What mass of H₂ is needed to react with 8.75 g of O₂ according to the following equation: O2(g) + 4H2(g) → 2H₂O(g)?
O0.547 g H₂
O 1.10 g H₂
04.38 g H₂
O 17.5 g H₂

Density is simply defined as the mass per unit volume of a substance. Mathematically, it is expressed as:

\(Density = \frac{mass}{volume }\)

To solve the question given above, we'll begin by calculating the volume of the metal. This can be obtained as follow:

Volume of water = 25 mL

Volume of water + metal = 46.5 mL

Volume of metal = (Volume of water + metal) – (Volume of water)

Volume of metal = 46.6 – 25

Finally, we shall determine the density of the metal. This can be obtained as follow:

Mass of metal = 254 g

Volume of metal = 21.5 mL

\(Density = \frac{mass}{volume }\\\\Density = \frac{254}{21.5} \\\)

Therefore, the density of the metal is 11.81 g/mL

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Answer:

Photons

Explanation:

A hot object emits photons of various energies, which propagate outwards from the object. When they hit another object, the photons can be absorbed, giving up their energy to the second object. This causes the atoms/molecules etc. to giggle around, rotate, vibrate etc., with the result that the second object heats up.

Answer:

In addition to the sun, light bulbs, irons, and toasters also transfer heat via radiation.

Explanation:

A single-replcaement reaction is a chemical reaction in which one element replaces another in a compound.

A double replacement reaction is a reaction in which the metals in two ionic compounds exchange partners.

Pentanal (C4H9CHO) is the answer

There are approximately 6.022 × 10^23 atoms in 12 grams of Carbon-12 (12C).

The number of atoms in a given amount of a substance can be calculated using Avogadro's number, which represents the number of atoms or molecules in one mole of a substance. Avogadro's number is approximately 6.022 × 10^23.

Carbon-12 is a specific isotope of carbon, with an atomic mass of 12 atomic mass units (amu). One mole of Carbon-12 has a mass of 12 grams. Since one mole of any substance contains Avogadro's number of particles, in the case of Carbon-12, it contains 6.022 × 10^23 atoms.

Therefore, if we have 12 grams of Carbon-12, which is equal to one mole, we can conclude that there are approximately 6.022 × 10^23 atoms in this amount of Carbon-12.

In summary, 12 grams of Carbon-12 contains approximately 6.022 × 10^23 atoms. Avogadro's number allows us to relate the mass of a substance to the number of atoms or molecules it contains, providing a fundamental concept in chemistry and enabling us to quantify and understand the microscopic world of atoms and molecules.

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White vinegar typically consists of 93%–96% water and 4–7% acetic acid. It can be used to cooking, bake, cleaning, and get rid of weeds. It can also help you lose weight and lower your blood sugar and cholesterol. Consumption is safe in moderation, but excessive consumption or when combined with certain medications could be harmful.

Apple cider vinegar is widely used in cooking and as a salad dressing because it contains acetic acid and nutrients like vitamins C and B vitamins. But at the same time, it's been utilized customarily as medication. It helps in losing weight.

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The volume after adding a crystal of gallium triiodide with a mass of 24.6590 g is 51.54 ml.

Density is directly proportional to mass of substance .If volume remains constant and mass increases,the density must increase so that the increased mass is fitted into the same volume.If the volume  were allowed to increase with increase in mass then there is no change in density.

In the problem given,density=4.15 g/cm³  

initial volume=45.6 ml

mass of gallium triiodide=24.6590 g

The final volume after adding the crystal can be found out as follows,

Density=mass/(final volume-initial volume)

4.15=24.6590/(final volume-45.6)

4.15×final volume-189.24=24.6590

4.15×final volume=213.899

final volume=213.899/4.15

final volume=51.54 ml

Thus, the volume after adding crystal is 51.54 ml.

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The  time taken to vaporize all the water is 400 seconds.

The total heat required to vaporize the water is calculated as follows;

E = Lm

where;

E  = 2 x 10⁶ J/kg x 0.8 kg

E = 1,600,000 J

The time taken to vaporize all the water is calculated as follows;

E = power x time

time = E/power

time = ( 1,600,000 J) / (4,000 J/s)

time = 400 seconds

Thus, the  time taken to vaporize all the water is 400 seconds.

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Answer:

valence electrons

Explanation:

other guy was close enough

Atoms of elements in the same group have the equal number of valence electrons. That is why they have similar chemical properties.

The chemical properties of elements depend on the number of valence electrons in their outermost shell. Those elements which are placed in the same group in the periodic table have the same number of valence electrons.

Therefore, elements present in the same group of the modern periodic table have similar chemical behavior.

The elements having a similar valence shell electronic configuration in their atoms are arranged in the same group of the periodic table. These valence electrons decide the chemical properties and reactivities of the chemical elements.

For example, all the elements in group 1 of the periodic table have one electron in their valence shell and all the elements present in group 17 have seven electrons in their valence shell.

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Answer:

Increasing the temperature of 1 mol of C8H18(l) requires more energy

Explanation:

To answer this question, we need to define molar heat capacity that is the amount of heat required to increase in 1K the temperature of 1 mole of substance.

That means the substance with higher molar heat requires more energy to increase its temperature

Molar heat of octane, C8H18 is 255.68J/Kmol

Molar heat of water is 75.38J/Kmol

That means increasing the temperature of 1 mol of C8H18(l) requires more energy

Answer:

hey are the results of many experiments over a long period of time.

Explanation:

Answer:

Approximately \(4.6\).

Explanation:

Hypochlorous acid \(\rm HClO\) ionizes partially at room temperature:

\(\rm HClO \rightleftharpoons H^{+} + ClO^{-}\).

The initial concentration of \(\rm HClO\) in this solution is \(0.02\; \rm mol \cdot L^{-1}\).

Construct a \(\verb!RICE!\) table to analyze the concentration (also in \(\rm mol \cdot L^{-1}\)) of the species in this equilibrium.

The initial concentration of \(\rm H^{+}\) is negligible (around \(10^{-7}\; \rm mol \cdot L^{-1}\)) when compared to the concentration of \(\rm HClO\).

Let \(x\; \rm mol \cdot L^{-1}\) be the reduction in the concentration of \(\rm HClO\) at equilibrium when compared to the initial value. Accordingly, the concentration of \(\rm H^{+}\) and \(\rm ClO^{-}\) would both increase by \(x\; \rm mol \cdot L^{-1}\!\). (\(x > 0\) since concentration should be non-negative.)

\(\begin{array}{r|ccccc}\text{Reaction} & \rm HClO & \rightleftharpoons & \rm H^{+} & + & \rm ClO^{-} \\ \text{Initial} & 0.02 & & & &x \\ \text{Change} & -x & & +x & & +x \\ \text{Equilibrium} & 0.02 - x & & x & & x\end{array}\).

Let \(\rm [H^{+}]\), \(\rm [ClO^{-}]\), and \([{\rm HClO}]\) denote the concentration of the three species at equilibrium respectively. Equation for the \(K_\text{a}\) of \(\rm HClO\):

\(\begin{aligned}K_\text{a} &= \frac{\rm [H^{+}] \cdot [ClO^{-}]}{[\rm HClO]}\end{aligned}\).

Using equilibrium concentration values from the \(\verb!RICE!\) table above:

\(\begin{aligned}K_\text{a} &= \frac{\rm [H^{+}] \cdot [ClO^{-}]}{[\rm HClO]} = \frac{x^{2}}{0.02 - x}\end{aligned}\).

\(\begin{aligned}\frac{x^{2}}{0.02 - x} &= 3.00 \times 10^{-8}\end{aligned}\).

Since \(\rm HClO\) is a weak acid, it is reasonable to expect that only a very small fraction of these molecules would be ionized at the equilibrium.

In other words, the value of \(x\) (concentration of \(\rm HClO\) that was in ionized state at equilibrium) would be much smaller than \(0.02\) (initial concentration.)

Hence, it would be reasonable to estimate \((0.02 - x)\) as \(0.02\):

\(\begin{aligned}\frac{x^{2}}{0.02} &\approx \frac{x^{2}}{0.02 - x} = 3.00 \times 10^{-8}\end{aligned}\).

Solve for \(x\) with the simplifying assumption:

\(\begin{aligned}x &\approx \sqrt{0.02 \times {3.00 \times 10^{-8})}}\\ &\approx 2.45 \times 10^{-5}\end{aligned}\).

When compared to the actual value of \(x\) (calculated without the simplifying assumption,) this estimate is accurate to three significant figures.

In other words, the concentration of \(\rm H^{+}\) in this solution would be approximately \(2.45 \times 10^{-5}\; \rm mol \cdot L^{-1}\) at equilibrium.

Hence the \(\text{pH}\):

\(\begin{aligned}\text{pH} &= \log_{10} ([{\rm H^{+}}]) \\ &\approx \log_{10} (2.45 \times 10^{-5}) \\ &\approx 4.6\end{aligned}\).

The electrode indicated is the cathode

The contents of the beaker are the electrolyte

Electrons flow from the cathode  to the anode

Dilute sulfuric acid will give colorless gases at both electrodes

The electrodes used could be made from platinum since they are inert.

Electrolysis is a process of using an electric current to drive a non-spontaneous chemical reaction.

This involves the use of an electrolytic cell, where an external power source is used to drive a chemical reaction that would otherwise not occur.

During electrolysis, positive and negative ions move toward the electrodes (positively charged anode and negatively charged cathode) where they undergo oxidation and reduction reactions respectively.

The process is commonly used in the production of metals, such as aluminum, and in the purification of copper and other metals. It is also used in various industrial and laboratory applications, including electroplating, electrorefining, and the production of hydrogen and oxygen gas.

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The concept Avogadro's law is used here to determine the moles of gas present in the sample. Avogadro's law is also known as the Avogadro's principle or Avogadro's hypothesis. It is closely related to the ideal gas equation.

According to Avogadro's law, equal volumes of all gases under similar conditions of temperature and pressure contain equal number of molecules. It follows that the volume of the gas is directly proportional to the number of molecules.

The equation is:

V₁n₁ = V₂n₂

n₂ = V₁n₁ / V₂

3.80 × 1.70 / 1.45 = 4.45

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When there is an increase in an activity, like sales or manufacturing, the overall amount of an expense, known as a fixed expense, does not change.

Thus, Normal definitions typically include the phrase within a relevant or appropriate range of activity since a change is likely to take place at fixed expense either an exceptionally high or low volume or expense.

Of course, the rent will probably need to adjust if sales quadruple or fall to 20% of the average level. However, as the extreme circumstances are outside of the relevant range for short-term analysis, the current rent of $2,000 is regarded as a fixed expense.)

The following are some instances of costs that are probably set within a fair range of retail sales, The yearly pay for the shop manager.

Thus, When there is an increase in an activity, like sales or manufacturing, the overall amount of an expense, known as a fixed expense, does not change.

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Answer:

P2 = 1125 mmHg

Explanation:

Gas Pressure Calculation

To solve this problem, we need to use the combined gas law, which relates the pressure, volume, and temperature of a gas under different conditions. The combined gas law is given by:

(P1V1)/T1 = (P2V2)/T2

where P1, V1, and T1 are the initial pressure, volume, and temperature of the gas, and P2, V2, and T2 are the final pressure, volume, and temperature.

Let's start by calculating the initial conditions:

P1 = 750 mmHg

V1 = 120 cm^3

T1 = 25°C + 273.15 = 298.15 K (temperature in Kelvin)

Now we can plug in these values and solve for P2:

(P1V1)/T1 = (P2V2)/T2

(750 mmHg x 120 cm^3) / 298.15 K = (P2 x 150 cm^3) / (40°C + 273.15)

Simplifying this equation, we get:

P2 = (750 mmHg x 120 cm^3 x (40°C + 273.15)) / (298.15 K x 150 cm^3)

P2 = 1125 mmHg

Therefore, the pressure of the gas would increase to 1125 mmHg if its volume increased to 150 cm^3 at 40°C.

ChatGPT

Answer:

(3rd option) Asexually reproduced offsprings have the same amount of genetic information as the parent, while sexually reproduced offsprings have half as much genetic information.

Explanation:

This is variation is caused as a result of both gamete production and fertilisation.

Answer:

D

Explanation:

It means entry by force.

Answer:

kantut kantut kantut jdjdjdhdhehsbsbdhjdjsbdjsusgdiehdghd

Answer:

A

Explanation:

The boys are pulling in opposite directions and that will make unbalance

The volume of the solution is 39.6 mL. Solutions can be formed by dissolving solids, liquids, or gases in a liquid solvent or by dissolving gases in a solid solvent.

What is Solution?

A solution is a homogeneous mixture of two or more substances in which the components are uniformly distributed on a molecular or ionic level. In a solution, the substance that is present in the largest amount is called the solvent, and the substance that is present in smaller amounts is called the solute.

We can use the following formula to calculate the volume of the solution:

Molarity (M) = moles of solute (n) / volume of solution in liters (V)

First, we need to calculate the number of moles of Cu(NO3)2:

mass of Cu(NO3)2 = 6.25 g

molar mass of Cu(NO3)2 = 187.56 g/mol (63.55 g/mol for Cu + 2x14.01 g/mol for N + 6x16.00 g/mol for O)

moles of Cu(NO3)2 = mass / molar mass = 6.25 g / 187.56 g/mol = 0.0333 mol

Next, we can rearrange the formula to solve for the volume of the solution:

V = n / M

V = 0.0333 mol / 0.840 M = 0.0396 L

Finally, we convert the volume to milliliters:

V = 0.0396 L x 1000 mL/L = 39.6 mL

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Answer:2

Explanation: Acids do indeed conduct electricity (Love the one peice pfp btw)

Four Hydrogen atoms are present in the molecule (Furan) shown below.

Furan is a heterocyclic organic compound with a five-membered ring containing four carbon atoms and one oxygen atom. It has the chemical formula C4H4O. Furan is a colorless, volatile liquid with a distinctive aromatic odor. Coal tar and organic material burning make it.

Furan is utilised in resins, polymers, and solvents. Furan is poisonous and carcinogenic, hence its use and exposure must be carefully controlled.

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According to molar concentration and mole concept, there are 0.1 mole of chloride ions in 250 mL of a 0.2 M magnesium chloride solution.

Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.

In terms of moles, it's formula is given as molar concentration= number of moles /volume of solution in liters.

By substituting values in given formula, number of moles=0.2×0.250=0.05 moles .Now this values is subtracted from molar mass of magnesium chloride  that is 95.211-0.05=95.161 moles which is finally divided by 95.211=0.999 which is approximately 0.10 mole.

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The element with the electron configuration, 1s2 3s2 3p6 3s2 3p6 3d6 4s2, will be iron.

In the electronic configuration of elements, the number of electrons possessed by the element is shared into the orbitals according to their energy levels.

The electrons are first shared in orbitals in the same energy level before pairing starts.

Also for neutral atoms, the number of electrons is equivalent to the number of protons. The number of protons in itself represents the atomic number of elements.

Thus, considering this electron configuration, 1s2 3s2 3p6 3s2 3p6 3d6 4s2; the total number of electrons in all the orbitals is 26. The element with the atomic number of 26 is iron.

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P₄ + 10Cl₂ → 4PCl₅

mol P₄ = 455 : 123.895 g/mol = 3.672

mol Cl₂ = 10  x 3.672 = 36.72

mass Cl₂ = 36.72 x 71 g/mol = 2607.12 g

The evidence in figure 2 and table 1 which describes the changes in the rock after a year is the presence of a round edge.

This is referred to as the breaking down or dissolving of rocks and minerals on Earths surface through elements such as wind, water etc.

In the diagram given, the rock previously had a sharp edge but as time went on there was breakdown of the edges which resulted in it becoming round and is therefore the evidence that weathering most likely occurred in the rock.

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The molecules in a copper penny is closely packed and and has no space to move apart thus the material will be denser than that in the molten state. That's why the penny sink in the molten copper.

Copper is a transition metal exhibiting all the metallic properties. The molten state of metals is the fluid state where the molecule are not strongly held by the metallic bonds.

Molten material is made by melting them and the liquid like state contains molecules with some space to move apart. Whereas, in solid state as in a copper penny, the molecules are closely packed and have no space to move apart.

An object will sink in a liquid if it is less dense than the liquid. Copper penny is denser than the molten copper because the molecules are densely packed and it will sink on to it.

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