This is the chemical formula for the methyl tert-butyl and ether (the clean-fuel gasoline additive MTBE): Ch3OC(CH3)3
A chemical engineer has determined by measurements that there are 0.0946 moles of carbon in a sample of methyl tert-butyl ether. How many moles of oxygen are in the sample? Be sure your answer has the correct number of significant digits.

A Biochemist is a type of chemist understands the structure of living systems and, in turn, their functions and ways to control them.

The chemistry of living system is known as Biochemistry.

Biochemistry is a study of the chemical changes that occur in living organisms.

Scientists that study biochemistry are called Biochemists.

Biochemistry studies the structure and function of biological molecules such as carbohydrates, lipids, proteins, e.t.c., as well the chemical reaction they undergo.

Biochemistry also studies the energy changes that occur in living systems.

In conclusion, the chemistry of living systems is called Biochemistry.

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The element that is most likely to pair with beryllium in a 1:1 relationship based on valence electron trends would be Se ( 6 valence electrons ). That is option A.

Valence electron is defined as the electron of an atom that is located at the outermost shell which takes part in formation of chemical bonding during a chemical reaction.

The number of Valence electron of the element beryllium = 2

The number of Valence electron of the selenium = 6

Therefore, both beryllium and selenium can form a chemical bond in a 1:1 relationship based on valence electron trends as both will complete their outer most shell into 8 electrons.

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Answer:

D

Explanation:

It is higher in the air, so it will fall faster then the other apples.

Answer:

Hello, your answer here is D - the apple still in the tree. Potential energy is the energy possessed by an object by virtue of its position. As height increases, so does the potential energy of an object. The apple at the highest position has the greatest potential energy.

Have a great day! - Mani :)

Answer:

Increase in the color intensity and hence the concentration of the reacting species increases the rate of the reaction according to collision theory

Explanation:

The given parameters are;

Rate of reaction of metal strip in light blue solution lesser than rate  of reaction of the metal strip in dark blue solution

Therefore, the color of the solution derives from the concentration of the reacting species involved in the reaction.

The increase in the darkness of the blue solution stems from the increase in the concentration of the reacting species which according to collision theory increases the fraction of the effective collisions, thereby increasing the reaction rate.

Answer:

Explanation:

The volume of a balloon is 30 L at 313K and a pressure of 153KPA What is the volume at 273K and 101.3kPa?

from PV=nRT we can derive

PV/T =P'V'/T' so

153X30/313 = 101.3 X V'/273

OR 153 X 30 X273/(313 X 101.3) =V'

V' = 39.5 L

It's important to know that the reaction must have the total mass involved before and after due to the law of conservation of mass. This means that the total mass number of the left side of the reaction must be equal to the right side. So, we have the following

Notice that 235 is the mass number of U, 1 is the mass number of the neutron, X represents the mass number of the unknown element, 141 represents the mass number of Ba, and 3 represents the mass number of three neutrons. This means X should have a mass number of 92, which is the element Kr.

Therefore, the mass number is 92 and the chemical symbol is Kr.

Answer:

2

Explanation:

Because 2 oxygen atoms in reactant are balanced only when 2H2O is produced.

The claim is that the chemist will use approximately 0.651 moles of ethanol in the experiment. This claim is justified based on the molar mass of ethanol (46.07 g/mol) and the given mass of 30 g, allowing for the calculation of moles using the formula: moles = mass/molar mass.

Given that the mass of ethanol is 30 g and the molar mass of ethanol (C₂H₅OH) is approximately 46.07 g/mol

To calculate the number of moles of ethanol, we can use the formula:

moles = mass/molar mass

Substituting these values into the formula:

moles = 30 g / 46.07 g/mol

Calculating this, we find:

moles ≈ 0.651 moles

Therefore, the chemist will use approximately 0.651 moles of ethanol in the experiment.

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The amount of heat required to melt 2654 g of acetone is approximately 260.34 kJ.

To calculate the amount of heat required to melt a given mass of acetone, we can use the equation:

q = m × \(\triangle H_{fus}\)

where:

q is the amount of heat (in joules)

m is the mass of acetone (in grams)

\(\triangle H_{fus}\) is the enthalpy of fusion of acetone (in joules per mole)

Given:

m = 2654 g

\(\triangle H_{fus}\) = 5.69 kJ/mol

First, we need to convert the mass of acetone from grams to moles. The molar mass of acetone (C₃H₆O) is approximately 58.08 g/mol.

moles = mass / molar mass

moles = 2654 g / 58.08 g/mol

moles ≈ 45.71 mol

So, q = m ×  \(\triangle H_{fus}\)

q = 45.71 mol × 5.69 kJ/mol

q ≈ 260.34 kJ

Therefore, the amount of heat required to melt 2654 g of acetone is approximately 260.34 kJ.

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The complete question is:

Calculate the amount of heat required to melt 2654 g of acetone (C₃H₆O). The enthalpy of fusion of acetone is ΔHfus=5.69 kJ/mol.

Waves are rhythmic disturbances that carry energy through matter or space without transferring matter,

Waves are disturbance that occur in a medium that tranfers energy as it is being propageated but wihout a pearmament displacement of the partcle of the medium.

There are two main types of waves, namely:

Mechanical waves - these are waves that require a materila medium for their propagation. For example, soud waves and water waves.

Electromagnetic waves - these are waved that  do not require a metarial medium for their propagetion. For example, light waves and radio waves.

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if the spacing between planes of atoms in NaCl crystal is 0.281 nm, the predicted angle at which 0.148-nm x-rays are diffracted in a first-order maximum is  20.1°(approx.).

The predicted angle at which 0.148-nm x-rays are diffracted in a first-order maximum can be calculated using Bragg's law, which states that nλ = 2dsinθ, where n is the order of diffraction, λ is the wavelength of the X-ray, d is the spacing between the planes of atoms, and θ is the angle of diffraction.

We can rearrange this equation to solve for θ:

θ = sin⁻¹(nλ/2d)

Plugging in the given values, we get:

θ = sin⁻¹(1(0.148 nm)/(2(0.281 nm)))

θ ≈ 20.1°

Therefore, the predicted angle at which 0.148-nm x-rays are diffracted in a first-order maximum is approximately 20.1°.

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To calculate the energy carried by one mole of photons of green light emitted by a fluorescent proflavine molecule at 514 nm, we'll use the energy formula: \(E = h * c /\lambda\) where E is the energy of a single photon, h is Planck's constant (\(6.626 *10^{-34} Js\)), c is the speed of light (\(2.998 * 10^8 m/s\)), and λ is the wavelength (514 nm).

First, convert the wavelength to meters:

\(514 nm = 514 * 10^{-9} m\).
Next, calculate the energy of a single photon:

\(E = (6.626 * 10^{-34} Js) * (2.998 * 10^8 m/s) / (514 * 10^{-9} m) = 3.872 * 10^{-19} J.\)
Now, to find the energy carried by one mole of photons, multiply the energy of a single photon by Avogadro's number (\(6.022 x 10^{23\)):
Energy per mole =\((3.872 *10^{-19 }J) * (6.022 * 10^{23}) = 233.0 kJ.\)
Thus, one mole of photons of green light emitted by a fluorescent proflavine molecule at 514 nm carries 233.0 kJ of energy.

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Answer:

Carbon Monoxide.

Explanation:

I used to lol. Things didn't pop up well in a doctor's appointment and I had it explained to me.

Answer: Sugar solution shows no current flow in an electrolytic cell.

Explanation:

Electric current is the flow of ions or charged species from one point to another.

A solution that does not contain any ions is not able to conduct electric current.

Thus,, we can conclude that sugar solution shows no current flow in an electrolytic cell.

Answer:

multitide of uses (drinking, cleaning, cooking, transportation). Without water we would not survive. -Lead atoms bond together and they make up the lead that we use as a pencil. -Copper atoms, aluminum atoms, nickel atoms, etc., all make up metal which is used for a variety of things in everyday life.

Explanation:

The most direct way to determine if a mineral is likely calcite is by performing an acid test. Calcite will effervesce or fizz when it comes into contact with a weak acid, such as vinegar.

The acid test is a commonly used method to identify calcite because it exhibits a unique reaction with weak acids. Calcite is composed of calcium carbonate, which reacts with acids to produce carbon dioxide gas. To perform the test, a small drop of weak acid, typically vinegar, is applied to the mineral sample.

If the mineral is calcite, it will effervesce or produce visible bubbles as carbon dioxide gas is released. This reaction is distinctive to calcite and allows for a quick and direct identification of the mineral.

It is important to note that the acid test should be conducted with caution and in a well-ventilated area, as the release of carbon dioxide gas can cause pressure buildup in a closed environment.

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The upthrust keeps a ship afloat. The upthrust keeps swimmers on top of the water. Things weigh less in water.

The upward force exerted on a body by the fluid in which the body is submerged is called the upthrust or buoyant force. The property of liquid to exert an upward force on a body immersed in it is called buoyancy. Being a force upthrust is measured in newton or kgf in the system of international units. Examples Pushing an empty can into water experiences the buoyant force. Pushing a cork into water into water experiences the buoyant force. Reason for Upthrust The thrust ating on on the sides of walls of the body get neutralised because they are equal in magnitude and opposite in the directions. There is a pressure difference between the lower and upper faces of block. Since force is the product of pressure and area, The difference in pressure due to liquid is on th two faces of causes a net upward force called upthrust on the body immersed in the fluid.

Answer: upthrust an upward force exerted by a fluid that opposes the weight of an immersed object.It is the force that pushes an object up. ... the upward force that a liquid or gas exerts on a body floating in it.

When a body is placed in water, Up thrust = V x d x g

From the above formula we can say that the following are the factors that affect up thrust:

Acceleration due to gravity - (g)

Density of the liquid - (d)

Volume of the body submerged in the liquid - (V), or volume of the liquid displaced (v)

Explanation:

The systematic name for PbO₂ is lead dioxide.Therefore, the correct option is A.

Systematic names are a type of chemical nomenclature that follow a systematic set of rules to name chemical compounds. Lead dioxide (PbO₂) is a chemical compound composed of lead and oxygen. It is an oxide of lead and can also be called lead(IV) oxide.

The systematic name of the compound is derived by using the root word of the metal, “lead,” and adding the suffix “-dioxide” to indicate the two oxygen atoms. Thus, the systematic name for PbO₂ is lead-dioxide.Therefore, the correct option is A.

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The question is incomplete, but most probably the complete question is,

Give the systematic name for PbO₂?

A. Lead dioxide

B. Lead trioxide

C. Lead oxide

D. Lead azide

A chemical reaction wherein two molecules combine to form one larger product is called a condensation reaction.

The process of joining two or more atoms or molecules to form a single product is known as a chemical reaction. These reactions can be divided into two categories: combination and decomposition reactions.

During the process of condensation reaction a small molecule is eliminated as a byproduct, such as water or alcohol.

The condensation reaction can be utilized to create a variety of polymers by joining smaller monomers together into more complex molecules.

This reaction can be utilized to create peptide bonds between amino acids in proteins, ester bonds between carboxylic acids and alcohols, and glycosidic bonds between sugars, for example.

In addition to the condensation reaction, there are other types of chemical reactions.

For example, Hydrolysis, decomposition, single displacement, double displacement, acid-base, redox, and oxidation reactions are all examples of different types of chemical reactions.

In summary, a chemical reaction wherein two molecules combine to form one larger product is called a condensation reaction.

This process is used to create a variety of polymers by joining smaller monomers together into more complex molecules.

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Answer:

c. add coefficients as needed

Explanation:

A chemical equation is defined as the equation that shows changes in a chemical reaction. A chemical equation consist of reactant and product, reactant is at left side of the arrow and product is at right side of the arrow.

Reactant => Product

While balancing a chemical equation, the basic rule is to balance the coefficient as required. Coefficient represents the number of molecules and is used at front of a chemical symbol. Change in coefficient helps balance the number of atoms or molecules of the substances on both the sides of the arrow.

Subscripts are never allowed to change because it can change the chemical involved in the reaction.

Hence, the correct answer is "c. add coefficients as needed".

Answer:

Without specific data being provided, it is challenging to identify the best-supported claim about the planets. However, based on general knowledge about the planets, some well-supported claims include:

1. The planets in our solar system orbit around the Sun.

This claim is well-supported by extensive astronomical observations and scientific research. The heliocentric model, proposed by Nicolaus Copernicus in the 16th century, provides a comprehensive understanding of planetary motion around the Sun.

2. The planet Earth has liquid water and supports life.

Extensive evidence from various scientific fields, including geology, biology, and climatology, supports the claim that Earth is the only known planet to harbor life. The presence of liquid water is crucial for supporting life as we know it, and Earth's diverse ecosystems provide ample evidence of life's existence.

3. The gas giant Jupiter is the largest planet in our solar system.

Based on measurements of the planets' sizes, Jupiter holds the title for the largest planet in our solar system. It has more than twice the mass of all the other planets combined and is visibly larger than any other planet when viewed from Earth.

4. Mars has geological features that suggest the past presence of liquid water.

Numerous missions, including the Mars rovers and orbiters, have provided compelling evidence of Mars' geological history and the likelihood of liquid water in the past. The presence of ancient riverbeds, canyons, and sedimentary deposits strongly supports the claim that Mars once had liquid water on its surface.

It's important to note that scientific understanding evolves as new data and research become available. Therefore, the best-supported claims may vary as our knowledge advances through ongoing scientific exploration and study.

Answer:

Substances that absorb energy in the form of heat are

b)endothermic.

hope it helps :)

When the gaseous Na+ and Cl− ions form gaseous NaCl ion pairs, 548 kJ/mol of energy is released. This is known that the energy released by combination of oppositely charged ion is called as Lattice energy.

Lattice energy is defined as the energy change upon formation of one mole of a crystalline ionic compound from its constituent ions which are assumed to initially be in the gaseous state. This energy is a measure of the cohesive forces that bind ionic solids. The lattice energy releases even more energy when gas is converted into solid. The ionic bonds are very strong due to high attractive forces holding the positively and negatively charged ions alternatively together. They are packed tightly and the crystal lattice structure is extremely hard to break. Thus at normal room temperature, Sodium chloride occur as solid.  

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Answer:

Didn't know the answer, sorry.

Answer:

First, we can find the partial pressure of carbon dioxide in the scuba tank by subtracting the sum of partial pressures of oxygen and nitrogen from the total pressure:

partial pressure of CO2 = total pressure - partial pressure of O2 - partial pressure of N2

partial pressure of CO2 = 3.33 atm - 1.20 atm - (unknown partial pressure of N2)

partial pressure of CO2 = 2.13 atm - (unknown partial pressure of N2)

Since the enhanced mixture only contains oxygen and nitrogen, the sum of their partial pressures should equal the total pressure:

partial pressure of O2 + partial pressure of N2 = total pressure

1.20 atm + partial pressure of N2 = 3.33 atm

partial pressure of N2 = 3.33 atm - 1.20 atm

partial pressure of N2 = 2.13 atm

Now we can substitute this value into the equation we found for the partial pressure of CO2:

partial pressure of CO2 = 2.13 atm - partial pressure of N2

partial pressure of CO2 = 2.13 atm - 0.77 atm

partial pressure of CO2 = 1.36 atm

Therefore, the partial pressure of nitrogen in the scuba tank is 0.77 atm.

Explanation:

Answer:The zero to the left of a decimal value less than 1 is not significant. All trailing zeros that are placeholders are not significant. Zeros between non-zero numbers are significant.

Explanation:I hoped i have helped u have an wonderful day or night

Answer:

water and air

Explanation:

The examples of medium from this problem is water and air.

A medium is an agency or a means of propagating energy, waves or even facilitating a chemical reaction.

Fluids are very good medium in chemistry for chemical reactions. The two most common media used are air and water.

In physics, a vacuum is an empty space that has been evacuated. It also serves as a medium to study some physical phenomenon.

Answer:

a

Explanation:

The concentration of \(Ca(OH)_2\) is 0.0217 M.

The balanced chemical equation for the reaction between the  \(Ca(OH)_2\) and the HCl is:

\(Ca(OH)_2 + 2HCl\) → \(CaCl_2 + 2H_2O\)

From this equation, we can see that 1 mole of \(Ca(OH)_2\) reacts with 2 moles of HCl.

The number of moles of HCl used can be calculated as:

moles HCl = Molarity * Volume in liters\(= 0.029 M\ *\ 0.0373 L = 0.0010837\ mol\)

Since the stoichiometry of the reaction is 1:2 between \(Ca(OH)_2\) and HCl, the number of moles of \(Ca(OH)_2\) in the 25.0 mL sample can be calculated as:\(moles\ Ca(OH)2 = 0.0010837\ mol / 2 = 0.00054185\ mol\)

The concentration of \(Ca(OH)_2\) can then be calculated as:

\(Molarity = moles\) ÷ \(Volume\ in\ liters\ = 0.00054185\ mol\) ÷ 0.025 L = 0.0217M

Therefore, the concentration of \(Ca(OH)_2\) is 0.0217 M.

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