About how many billion years ago did the big bang occur?.

Answer: Beaker D

Explanation:

A higher concentration of HCl would mean more HCl avaliable to react with the magnesium strip. In addition, the reaction occurs faster at a higher temperature as the molecules move around faster and have a higher chance of colliding with the correct orientation. Therefore, the answer is Beaker D.

Answer: 4P + 3O2 → P4O6

Explanation: plz give brainliest

Answer: I think the answer is 9.60s

Explanation: Hope it helps :)

Answer:

K Only

Explanation:

Pretty sure that we only use Kelvin Scale in gas laws as it provides us with the absolute temperature, this is because in gas laws we are also concerned with motion of particles i.e. kinetic energy and we only use kelvin because 0K means 0 kinetic energy (we cannot do the same using other units)

Tert-butyl groups are locked into the equatorial position in certain molecules to minimize steric hindrance caused by 1,3-diaxial interactions. This arrangement is energetically favorable as it reduces the repulsive interactions between the bulky tert-butyl group and neighboring substituents.

The equatorial position is preferred for tert-butyl groups in certain molecules due to steric hindrance considerations. When a tert-butyl group is axial, it experiences unfavorable interactions with the neighboring substituents on the same or adjacent carbon atoms. These interactions are known as 1,3-diaxial interactions and can lead to increased energy and distortion in the molecule. By placing the tert-butyl group in the equatorial position, it is oriented away from the neighboring substituents, reducing steric hindrance and minimizing the 1,3-diaxial interactions. This arrangement allows for a more stable conformation of the molecule, as the bulky tert-butyl group is positioned in a way that maximizes the distance between itself and other substituents. Consequently, the equatorial position is energetically favorable and helps maintain the overall stability of the molecule.

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The time it will take the student to get home if she averages 42 miles per hour is 8.7 minutes.

The time taken for an object to move over a certain distance can be calculated by dividing the distance moved by the average speed as follows:

Time = Distance/average speed

According to this question, a student has to stay after school to make up a test. If she lives 9.8 km away from the school. The time it will take her to get home can be calculated as follows:

9.8km is equivalent to 6.09 miles

Time = 6.09 mi ÷ 42mi/hr

Time = 0.145hours

0.145 hours can be converted to 8.7 minutes.

Therefore, it will take the student 8.7 minutes to get home.

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Explanation:

Letter B .... hope this explanation will help

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Compared to glass, plastic sheet substitutes are generally less durable.

Glass is a very strong and durable material that is much more resistant to scratches and other types of wear and tear than plastic. Plastic sheets are often used as a substitute for glass because they are often cheaper and lighter, but they are not as strong or as durable.Plastic sheeting is generally not as durable as glass, as it is more prone to cracking, scratching, and other damage. Plastic can also be affected by extreme temperatures, whereas glass is more heat-resistant. Additionally, plastic is much more susceptible to UV radiation damage, which can cause it to become brittle and break over time. Glass, on the other hand, is highly durable and can withstand extreme temperatures and pressure without cracking or breaking.

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Water has a molar mass of 18 g/mol while sodium hydroxide has a molar mass of 40 g/mol. As a result, to make 80 g of sodium hydroxide, 18 g of water is needed. Hence, 36 grams of water are required to make 160 grams of NaOH.

Both Na and O are out of balance, thus the balanced equation using the hit-and-miss method is 4Na+O22Na2O.

Due to the molar mass of 61.98 g mol-1, the structure of Na2O is a little complex. The oxidization is composed of a single oxygen atom, which is bonded to two sodium atoms via a few ionic connections. The molecule's structure is similar to that of an antifluorite crystal, so the Na atoms coordinate 4 O2 atoms.

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Answer:

One mole of calcium is present in one mole of calcium carbonate

Explanation:

Because its formula is CaCO3

Ca contains 2+ charge and CO3 contains 2- charge

Answer:

conductivity in solid state/ in water

Explanation:

conducitvity in water state would be least helpful when trying to determine the bond type that has the strongest intermolecule force, becuase they (salt and water) both would dissolve in water the same.

The property that will be least helpful in the determination of the bond type that has the strongest intermolecular forces is C. Conductivity in water.

It should be noted that the students wanted to investigate whether ionic or covalent bonds have stronger intermolecular forces.

In order to carry out the investigation, salt, sugar, and molar balls are used. Based on this, the property that is required for the investigation will be flammability, solubility in water, and the melting point.

The conductivity in water isn't required.

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When an atom forms an ion, it either gains or loses electrons. Ions that have gained one or more electrons are called anions, while ions that have lost one or more electrons are called cations.

The ion formed from aluminum would be smaller than the neutral aluminum atom. Ions form when an atom either gains or loses electrons. The size of an ion varies depending on the number of electrons it has lost or gained. Ions with a positive charge are called cations, while ions with a negative charge are called anions. Aluminum forms a cation when it loses three electrons to form the ion Al³⁺.

A cation is a positively charged ion formed by the loss of one or more electrons from an atom. Cations are smaller than their parent atoms because they have fewer electrons. Because the aluminum ion, Al³⁺, has lost three electrons, it is smaller than the neutral aluminum atom. Therefore, the ion formed from aluminum would be smaller than the neutral aluminum atom.

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The standard enthalpy change for reaction (3) is 117.1 kJ.

The standard enthalpy change for reaction (3) can be calculated by using the enthalpy changes of reactions (1) and (2) and applying Hess's Law.

To do this, we need to manipulate the given equations so that the desired reaction (3) can be obtained.

First, we reverse reaction (1) to get the formation of C2H4(g) from C2H6(g):

C2H4(g)C2H6(g) ΔH° = -52.3 kJ

Next, we multiply reaction (2) by 2 and reverse it to obtain 2 moles of C2H6(g) reacting to form 3 moles of H2(g):

2C2H6(g)2C(s) + 3H2(g) ΔH° = 169.4 kJ

Now, we add the two modified equations together:

C2H4(g)C2H6(g) ΔH° = -52.3 kJ
2C2H6(g)2C(s) + 3H2(g) ΔH° = 169.4 kJ

When adding these equations, the C2H6(g) on the left side cancels out with the C2H6(g) on the right side, leaving us with the desired reaction (3):

C2H4(g) + H2(g)C2H6(g) ΔH° = -52.3 kJ + 169.4 kJ = 117.1 kJ

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The balanced chemical reaction using a system of linear equations is 24CO₂ + 24H₂O → 2C₆H₁₂O₆ + 12O₂

In the chemical reaction given, to balance:

xCO₂ + yH₂O → 2C₆H₁₂O₆ + wO₂

Set up the equations. Have the same number of each type of atom on each side of the equation.

For carbon (C):

x = 262 (12 carbon atoms in each C₆H₁₂O₆ and there are 2 of them)

For hydrogen (H):

2y = 2122 (12 hydrogen atoms in each C₆H₁₂O₆ and there are 2 of them)

For oxygen (O):

2x + y = 1222 + 2w (6 oxygen atoms in each C₆H₁₂O₆, there are 2 of them, and there are 2 atoms in each O2)

From the first two equations x = 24 and y = 24.

Substituting x and y into the oxygen equation gives:

224 + 24 = 122*2 + 2w

72 = 48 + 2w

2w = 24

w = 12

So, the balanced chemical reaction is:

24CO₂ + 24H₂O → 2C₆H₁₂O₆ + 12O₂

This is the photosynthesis reaction, which converts carbon dioxide and water into glucose and oxygen, with the help of sunlight.

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Answer:

CO2 and H2O

Explanation:

CO2 and H2O are both compounds

In the photoelectron spectrum, the unknown element's electron configuration can be identified.

The unknown element's electron configuration is the arrangement of its electrons in shells and subshells around its nucleus.

A photoelectron spectrum is used to investigate the electronic structure of atoms and molecules.

Photoelectron spectroscopy involves irradiating a sample with photons and detecting the emitted photoelectrons. A photoelectron spectrum graph is used to depict the energies of the photoelectrons emitted from an atom as a result of the irradiation of a high-energy photon.

The photoelectron spectrum of the unknown element is shown in the figure. The energy levels are listed in eV on the x-axis, while the y-axis depicts the photoelectron counts.

Below is the unknown element's electron configuration:

Electron configuration: 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁶ .

The electron configuration of the unknown element is derived from the photoelectron spectrum.

The element's electron configuration is derived by comparing the binding energy levels of the photoelectrons to the known energies of the orbitals of the atom.

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The complete question is-

A) Based on the photoelectron spectrum, identify the unknown element and write its electron configuration. B) Consider the element in the periodic table that is directly to the right of the element identified in part (a). Would the 1s peak of this element appear to the left of, right of, or in the same position as the 1s peak of the element in part (a)? Explain your reasoning.

False. On a standard temperature-pressure unary phase diagram, each point represents a single phase at equilibrium.

The diagram shows the boundaries between different phases (e.g., solid, liquid, gas) as a function of temperature and pressure. At any given point, only one phase is stable and in equilibrium. In a unary phase diagram, the horizontal axis represents temperature, and the vertical axis represents pressure. The diagram shows the stable phases as different regions or areas. At certain combinations of temperature and pressure, two phases can coexist in equilibrium. For example, consider the phase diagram of water. At low temperatures and high pressures, the diagram shows regions where both solid ice and liquid water can coexist.

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Answer:

a carbonyl group

Explanation:

Functional group can be interconverted into each there by the means of suitable reagent. Functional group are responsible for the chemical and physical properties of a compound. The correct option is option D that is  amine group.

A group of atoms forming a component of a molecule that accounts for a particular function or chemical behavior is called a functional group. There are so many functional group in organic chemistry. Functional group determine the property of a compound.

The list of functional group are as follow:

Carboxylic group COOH

Alcoholic group OH

Ammine group R-NH₂

Ketonic group R-CO_R

Aldehydic group R-CHO

Thiol group R-S-H

Cyanide group -CN

The given image represent amine group.

Therefore the correct option is option D that is  amine group.

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Answer: Fossil fuels are rich in carbon, and burning them releases carbon into the atmosphere.

Explanation:

The amount of carbon in the form of carbon dioxide in the atmosphere is about 0.03% by volume. This value is kept fairly constant by a natural process known as the CARBON CYCLE. This involves carbon dioxide being continually removed from the atmosphere by plants in photosynthesis, rain water as weak acids while in order to maintain this balance, carbon dioxide is at the same time returned to the atmosphere by:

--> burning of carbon containing substances (fossil fuel)

--> respiration of plants and animals and

--> Decomposition of organic substances.

Therefore the role of fossil fuels which are rich in carbon content releases carbon into the atmosphere when burnt.

False. The new temperature of the gas system would still be 25.0 °C or 298.15 K, not 50.0 °C.

According to Charles's law, at constant pressure, the volume of a gas is directly proportional to its temperature in Kelvin.
If the temperature of the gas system is 25.0 °C or 298.15 K and the volume doubles, the new temperature can be calculated using the formula V1/T1 = V2/T2.
V1/T1 = V2/T2

(2V1)/(T1) = V2/T2

T2 = (2V1T1)/(V2)

T2 = (2 x 298.15 K x 1)/(2 x 1)

T2 = 298.15 K

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Answer:

K I will attempt

Explanation:

a)

\(O_2_{(g)}+ 2H_2_{(g)} => 2H_2O_{(l)}\\\)

b)

1 : 2 : 2 (I don't know if this is what the question wants but it is what I would answer)

c)

Hydrogen because it requires 2 moles of H2 to react with 1 mole of O2

d)

24 moles of water. Look at stoichiometric coefficient. 2:2 means 24 moles you get 24 moles

e)

Oxygen. 2 < 5/2. Remember, 1 mole of O2 requires 2 moles of H2. But 5/2 is still greater than 2

f)

First, let's find out how many moles of water we can get. Since O2 is the limiting reactant, and O2:H2O ratio is 1:2, we will get 4 moles of H2O. Then, we can multiply 4 by Avogadro's number which is \(6.022*10^{23}\) to get the number of molecules. We get: 2.41 * 10^24 molecules of water.

Answer:

I'ma just take the point thank you very much

Answer:

Should be number 4, quartz.

Explanation:

Quartz is rougher than calcite, therefore it's able to scratch it.

Answer:

Calendar and periodic table both have repetitive patterns.

Explanation:

In calendar the days are arranged and divided into weeks whereas in the periodic table the elements are arranged in increasing atomic number and divided into groups

This titration involves adding 50.00 ml of 0.125 M HBr (strong acid) to 0.200 M NaOH. (strong base). The Correct option is A

When the amount of acid added equals the amount of base added, the equivalence point is reached. According to the reaction's stoichiometry, this happens when 31.25 ml of NaOH have been added.

We use the fact that HBr is a strong acid, which implies that it totally dissociates in water to create H+ ions and Br- ions, to determine the pH at different volumes of NaOH supplied. Only the HBr is present at 0.00 ml of NaOH applied, hence the pH may be determined using the initial concentration of H+. We must use the amount of HBr that hasn't been completely neutralised after 10.0 ml of NaOH have been introduced in order to determine the concentration of H+ ions.

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Answer:

-198.15

Explanation:

sorry if wrong form

Answer:Potassium metal reacts very rapidly with water to form a colourless solution of potassium hydroxide (KOH) and hydrogen gas (H2). The resulting solution is basic because of the dissolved hydroxide. The reaction is exothermic.

Explanation:

Based on the molar concentration, the volume of  FeCl₃ required is 371 mL

The mole ratio of the reaction is determined from the equation of the reaction as follows:

Equation of reaction: FeCl₃ (aq) ----> Fe³⁺ (aq) + 3 Cl⁻ (aq)

From the equation of reaction, the mole ratio of FeCl₃ to Cl⁻ is 1 : 3

The moles of chloride ions in 650 mL of  0.300 M is calculated from the formula below:

Moles of Cl⁻ ions = 0.300 * 650/100

Moles of Cl⁻ ions = 0.195

Moles of FeCl₃ required =  0.195/3

Moles of FeCl₃required = 0.065

volume of  FeCl₃ required = 0.065 / 0.175

volume of  FeCl₃ required = 0.371 L or 371 mL

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Answer: The molar mass of the gas is 9.878 g/mol.

Explanation:

According to Graham's law, the rate of diffusion is inversely proportional to square root of molar mass of gas.

\(Rate = \frac{1}{\sqrt{M}}\)

where,

M = molar mass of gas

As given gas diffuses 1/7 times faster than hydrogen gas. So, its molar mass is calculated as follows.

\(\frac{R_{1}}{R_{2}} = \sqrt{\frac{M_{2}}{M_{1}}}\\\)

where,

\(M_{1}\) = molar mass of hydrogen gas

\(M_{2}\) = molar mass of another given gas

\(R_{1}\) = rate of diffusion of hydrogen

\(R_{2}\) = rate of diffusion of another given gas = \(\frac{1}{7}R_{1}\)

Substitute the values into above formula as follows.

\(\frac{R_{1}}{R_{2}} = \sqrt{\frac{M_{2}}{M_{1}}}\\\frac{R_{1}}{\frac{1}{7}R_{1}} = \sqrt{\frac{M_{2}}{2}}\\7 \times 1.414 = M_{2}\\M_{2} = 9.878 g/mol\)

Thus, we can conclude that the molar mass of the gas is 9.878 g/mol.

Answer:

98.78 g/mol

Explanation:

Just took the test