A student in chm 11500 lab measured a 10. 00-ml sample of deionized water into a pre-weighed erlenmeyer flask using a 50-ml buret and recorded the mass as 9. 95 g. The temperature of the sample was 24 °c. The percent error in the volume measurement was __________________.

The 100g solution of mannitol has 549.45 millimoles.

Mannitol (C₆H₈(OH)₆) is used in pharmaceutical goods as a sweetener, tablet and capsule diluent, excipient for chewable tablets, tonicity agent, and vehicle (bulking agent) for lyophilized preparations. It is used as a drug to lower elevated intracranial pressure and lower ocular pressure, as in glaucoma.

The molecular weight of mannitol = 182g.

Mass of mannitol given = 100g.

∴ Moles per liter of mannitol = [tex]\frac{Mass of mannitol}{Molecular weight of mannitol}[/tex]

                                                  [tex]=\frac{100}{182}[/tex]

                                                  = 0.54945 moles

Now,

1 mole = 1000 millimoles

∴ 0.54945 moles of mannitol = [tex]\frac{0.54945 }{1000}[/tex]

                                                = 549.45 millimoles

Hence, the 100g solution of mannitol has 549.45 millimoles.

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Although the valence electron structures of the atoms of each element in a vertical column are often the same, the number of energy levels in the atoms increases as the elements descend the column.

Because of their comparable chemical behavior, the vertical columns of the periodic table are referred to as groups or families. A family of elements' members share the same valence electron count and chemically similar characteristics.

Periods and groups are the names of the horizontal rows and vertical columns, respectively. Chemical characteristics of elements within the same group are comparable. Due to the fact that they have an equal number of outside

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Secondary pollutants are produced in the air as a part of photochemical smog resulting from a chemical reaction in the presence of sunlight.

The secondary pollutants are the type of pollutants that are formed as a result of combination of two or more primary pollutants in the presence of sunlight.

Examples of secondary pollutants include the following:

Therefore, Secondary pollutants are produced in the air as a part of photochemical smog resulting from a chemical reaction in the presence of sunlight.

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The density of a 167.4 g sample of magnesium having a volume of 96.32 ml is 1.737 g/cm3.

The mass per unit volume is known as density. A scalar quantity, density. It is represented by the letter D, and the Greek letter rho is used as the sign for density. Mass divided by volume is how density is computed.

Mass is a physical body's total amount of matter. Mass is defined as the sum of the moles of the material and the compound's molar mass.

Given the mass is 167.4 g

The volume is 96.32 ml

mass / volume

167.4  / 96.32 = 1.737

Thus, the density of a 167.4 g sample of magnesium is 1.737  g/cm3.

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The gas mileage is 39.986 miles/gallon.

A gallon is a unit of volume in both the US customary and imperial systems of measurement. The US gallon is defined as 231 cubic inches (3.785 liters).

1 km = 0.621371 mi;

1 L = 0.264172 gal

a gas mileage = 17 km/L

d(automobile) =  17 km x 0.621371 km/mi

d(automobile) = 10.563 mi; the distance

V(automobile) = 1 L x 0.264172 L/gal

V(automobile) = 0.264172 gal; the volume of an automobile

a gas mileage = d(automobile) ÷ V(automobile)

a gas mileage = 10.563 mi ÷ 0.264172 gal

a gas mileage = 39.986 mi/gal

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The ancestors of modern cyanobacteria performed the oxygenic photosynthesis responsible for converting our anoxic planet to an oxygenated one.

Photosynthesis sustains life on Earth today by releasing oxygen into the atmosphere and providing energy for the food chain. The rise of oxygen-producing photosynthesis enabled the evolution of complex life forms such as animals and land plants about 2.4 billion years ago. An example of photosynthesis is how plants grow by converting sugars and energy from water, air, and sunlight into energy. (biology) The process by which plants and other photoautotrophic plants produce carbohydrates and oxygen from carbon dioxide, water, and light energy.

Photosynthesis is important for plants to produce the glucose needed to manufacture energy and cellular structures. Photosynthesis also produces the oxygen that both plants and animals need for cellular respiration to make ATP, a complex organic chemical that provides energy.

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2 linear positional isomers of nonene are there

Nonene have molecular formula is C₉H₁₈ called nonene no of possible isomers are 35 but including branched there are 35 isomers of nonene while linear compound mean only straight chain compound here straight chain compound are only 2 common name for nonene is non-1 ene there are so many isomers are seen in nonene Straight chain, Octanes, Heptanes,3,1 Dimethylheptanes,3,2 Ethylheptanes, Hexane, 4.1 Trimethyl. 4.2 Methyl+Ethyl, Pentane. in nonene class of organic compounds known as unsaturated aliphatic hydrocarbons. these are aliphatic hydrocarbons that contains one or more unsaturated carbon atoms. These compounds contain one or more double or triple bonds.

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The immediate effect of hyperventilation on the CO₂ concentration in the blood is low levels of carbon dioxide in the blood.

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Answer:

7.6410^-14 grams N2O4

Explanation:

I will assume that "contains a billion (1.00 × 10º)" is meant to read "(contains a billion (1.00 × 10^9)."

One mole of anything contain 6.02x10^23 particles of that thing (atoms, molecules, paper clips, suns, etc.).  If there are 1.00x10^9 particles of N2O4, we have:

(1.00x10^9 particles N)/(6.02x10^23 particles/mole) = 1.66x10^-15 mole of N atoms

Each mole of N2O4 contains 2 moles of N atoms:  

(1 mole N2O4)/(2 moles N atoms)

(1.66x10^-15 mole of N atoms)*(1 mole N2O4)/(2 moles N atoms) =

8.31x10^-16 moles N2O4

The molar mass of N2O4 is 92.01 g/mole.

(8.31x10^-16 moles N2O4)*(92.01 g/mole) = 7.6410^-14 grams N2O4

Acetic acid are in 1.52 ml if the concentration of the solution is 1.23 m 0.031  mole are present.

Here mass of acetic acid is 60g/mol and here given mole is 1.52 ml then

1.52/60= 0.025 and also here  concentration are given then concentration=n/V so, n=C×V= 1.23 × 0.025=0.03mole

So in 1.52 ml 0.03mole are seen

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Answer:

please mark as brainliest

Explanation:

Isotopes are atoms of the same element that have different numbers of neutrons but the same number of protons and electrons . The difference in the number of neutrons between the various isotopes of an element means that the various isotopes have different masses.

example:chlorine is an example of an isotope it has a proton number of 17 and a mass number of 35 in some cases they have a proton number of 17 and a mass number of 37 there is difference in the number of neutron to calculate this we do it this way.for the first one

mass number=proton+neutron

neutron=mass number-proton

neutron=35-17

neutron=18

for the second one

neutron=37-17

neutron=20

Urn the gas off immediately if the flame sputters, flares, or goes out, or if you  smell gas.

If something which includes an engine or a flame sputters, it really works or burns in an uneven way and makes a chain of soft popping sounds.

What reasons a gasoline burner to sputter?

if your gasoline burner is hissing, sputtering, or burning a yellow flame, it isn't always running successfully. The problem is due to an excessive amount of or too little air being supplied to the flame. here is a way to make an adjustment: Wait to carry out your repair until the stovetop floor is cool

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The pH of the solution after dilution is 1.125.

HCl is hydrochloric acid. It is known by the name muriatic acid. It is among the strong acids. It has a pungent smell and is colorless. It has a molar mass of 36.4 g/mol. It's a common reagent used in pharmaceutical industries. It is also used in other industries such as textile, rubber, and metal.

The volume of HCl added to the solution = 3.0 ml

The molar concentration of HCl = 2.5 M

Let the molar concentration of the solution after dilution is x.

The volume of the diluted solution = 100 ml.

The molar concentration of the solution after dilution is,

[tex]M _{1} V _{2} = M_{2} V _{2} [/tex]

[tex]M_{2} = \frac{ M _{1} V _{2}}{V _{2} }[/tex]

[tex]M_{2} = \frac{2.5 \times 3}{100} [/tex]

[tex] = 0.075 \: M[/tex]

Thus, the molar concentration of the solution after dilution is 0.075 M.

The pH of the solution after the dilution is,

[tex][HCl] = [H ^{ + } ] = 0.075 \: M[/tex]

[tex]pH = - log [H ^{ + } ] [/tex]

[tex]pH = - log(0.075)[/tex]

[tex]pH = 1.125[/tex]

Therefore, the pH of the solution after dilution is 1.125.

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Submicroscopic events are the structure and behavior of the matter or particle that can use for the macroscopic observations of the matter.

Sub microscopic elements are very minute and small particles that can be only seen by a microscope. These are small particles that together make the big matter.

Macroscopic particles are big particles that are constituted by small particles.

Thus, the structure and behavior of the matter or particle that can be used for macroscopic observations of the matter are submicroscopic occurrences.

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Process in which co2, is released as a by-product of oxidation-reduction reactions is known as krebs cycle.

In the mitochondrial matrix, acetyl-CoA is converted to carbon dioxide by the citric acid cycle, which also involves the reduction of coenzymes to produce ATP for the electron transport chain.

The acetyl group of acetyl-CoA is oxidized to make two molecules of CO2 in a succession of eight steps, while also producing one ATP. Additionally, reduced high-energy molecules like NADH and FADH2 are created.

Each glucose molecule produces two acetyl-CoA molecules so, the Krebs cycle must be completed twice to produce the four CO2, six NADH, two FADH2, and two ATPs.

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28 grams of iron will be needed to react completely to form 40 grams of iron oxide.

The atomic mass of iron, 2 Fe = 112

The molecular mass of iron oxide (III) = 160

We have to find how many grams of iron are required to form 40 grams of iron oxide.

By using the comparison formula, we get,

The atomic mass of iron/ Molecular mass of iron oxide = Mass of iron/mass of iron oxide.

Mass of iron = 112/160 × 40

Or, the mass of iron = 28grams.

Therefore, 28 grams of iron will be required to react completely to form 40 grams of iron oxide.

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Stereochemistry of the vinyl boronic acid will be retained and Stereochemistry of the vinyl halide will be retained is how the stereochemistry of the starting materials affected in the Suzuki reaction.

Some compounds have two stereogenic centers or more. Whether or whether those centers are equivalent determines the stereochemistry that results. Similar sets of substituents are present in equivalent sterogenic centers.

There are 2n stereoisomers for n nonequivalent centers. These isomers include certain pairings of enantiomers. These stereoisomers are mirror images of each other because each center of them has the opposite arrangement. Diastereomers are all other stereoisomers.

The answer's solution is included as an image.

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"Saccharomyces cerevisiae causes bread to rise by creating carbon dioxide bubbles as a byproduct of fermentation."

This statement is true.

Fermentation is the technique of making carbon dioxide bubbles that reason the dough to rise.

Carbon dioxide is produced in the course of fermentation and turns into trapped withinside the dough as a small wallet of air. this will increase it. When baked, the carbonic acid expands and the bread rises even extra.

Bread rises due to the fact the yeast eats the sugar and releases the carbon dioxide trapped withinside the gluten of the bread. The extra sugar the yeast eats, the extra fuel line it produces, and the taller the bread rise!

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2 electron bonds are shared between two carbon atoms when they are joined by a double bond.

An atom is a particle of matter that uniquely defines a chemical element. Atoms consist of a central nucleus surrounded by one or more negatively charged electrons. The nucleus is positively charged and contains one or more relatively heavy particles known as protons and neutrons.

Atoms are made up of two types of elementary particles: electrons and quarks. Electrons occupy the space surrounding the nucleus. Each electron has a charge of -1. Quarks form protons and neutrons, which form the nucleus. About 99% of the human body is made up of atoms of hydrogen, carbon, nitrogen, and oxygen. It also contains much smaller amounts of other elements necessary for life. November 6, 2015

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Answer:

It will cost $35.5602

Explanation:

$2.459 /6.5 (mpg) = 0.3783 (cents per mile)

$0.3783 (cost per mile) * 94 (total miles) = $35.5602 total

There are 94,608,000 seconds using conversion factor in 3 years.

First, let's calculate the number of seconds in 1 year, and then multiply it by 3 to get the total number of seconds in 3 years.

Conversion factors:

1 year = 365 days

1 day = 24 hours

1 hour = 60 minutes

1 minute = 60 seconds

Step 1: Calculate the number of seconds in 1 year.

[tex]\[\text{1 year} = 365 \text{ days} \times \left(24 \text{ hours/1 day}\right) \times \left(60 \text{ minutes/1 hour}\right) \times \left(60 \text{ seconds/1 minute}\right)[/tex]

Step 2: Calculate the number of seconds in 3 years.

[tex]\[\text{3 years} = 3 \times \left(365 \text{ days} \times \left(24 \text{ hours/1 day}\right) \times \left(60 \text{ minutes/1 hour}\right) \times \left(60 \text{ seconds/1 minute}\right)\right)\][/tex]

Now, let's perform the calculations:

1 year = 365 * 24 * 60 * 60 seconds

          = 31,536,000 seconds

3 years = 3 *31,536,000

            = 94,608,000 seconds

So, there are 94,608,000 seconds in 3 years.

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Because the excess chemical compound can be contaminated with other chemical compound and some reaction can be happen thats why returning chemicals to a reagent bottle introduce contaminants.

There is a chance for the chemicals which is taken out from the reagent bottle to be contaminated with other substances. the chemical property of some of these chemicals may change on contact with air. all these factors may affect the quality of further reactions that were supposed to be carried out by these unused reagents

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The pH of the solution is 6.07.

pKa = 6.86; the acid equilibrium constant

c(H₂PO₄⁻) = 0.422 mM; concentration of the acid

c(HPO₄²⁻) = 0.068 mM; concentration of the salt

Henderson–Hasselbalch equation for the buffer solution:

pH = pKa + log(c(HPO₄²⁻)/c(H₂PO₄⁻))

pH = 6.86+ log (0.068 mM/0.422 mM).

pH = 6.86 + log0.161.

pH = 6.86 - 0.79

pH = 6.07; potential of hydrogen

pH (potential of hydrogen) is a numeric scale used to specify the acidity or basicity an aqueous solution.

When pH is less than seven (pH<7), solution is acidic..

When is equal seven (pH = 7), solution is neutral.

When pH is greater than seven (pH > 7), solution is basic.

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Disulfide bond forms when the sulfur atoms in two adjacent protein chains are joined together.

When the sulfur atoms in two adjacent protein chains come together, strong chemical side bonds form. Weak physical side bonds are caused by the attraction of opposite electrical charges. Polypeptide chains that are coiled. Chemical bonds that connect amino acids end to end in long chains.

These peptide subunits can form complex structures by bonding with other peptides. Chemical bonds of various types hold proteins together and bind them to other molecules. Examine the chemical bonds that are responsible for protein structure. A protein's primary structure is made up of amino acids linked together in a chain.

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OCFCs were found in the atmosphere at high levels.

Ozone absorbs the maximum of the ultraviolet radiation from the sun. faraway sensing is the technology of obtaining statistics about gadgets or regions from a distance, usually from aircraft or satellites. A Lidar mild Detection and the ranging image were created with data accrued by NOAA's country-wide Geodetic Survey. In 1985 Jonathan Shanklin turned into a junior researcher at BAS while he determined a hole in the invisible defense that protects us from solar radiation.

The ozone layer, which lies high within the ecosystem, shields us from harmful ultraviolet UV rays that come from the sun. Human activities successfully punched a hollow in it, through the use of gases like chlorofluorocarbons CFCs in spray cans and refrigerants, which wreck down ozone molecules in the top environment. Depletion of the ozone layer has outcomes on humans, animals, and plant life. This is typically a consequence of higher UV degrees achieving us on earth. The chlorofluorocarbons act like ultraviolet radiation inflicting a big amount of ozone to be produced.

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Yes; you need to know how long the light bulb is on.

Because of this, lower wattage bulbs are sometimes referred to as "equivalent to 60W"; nevertheless, what is equal is brightness, not energy consumption.

Converting wattage to kilowatts is the best way to determine how much energy your lightbulb consumes. Thus, 0.1 kW would be needed per hour for a 100W light bulb.

Incandescent (up to 100W) and halogen (up to 120W) light bulbs with higher energy consumption are being phased out. You may get ornamental exposed carbon filament light bulbs, which are normally 40–60W, if you still have any of them operating in your house.

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Answer:

Plank length

Explanation:

The smallest possible size for anything in the universe is the Planck Length, which is 1.6 x10-35 m across.

Elements that would share similar properties are c) Cl and Br.

Elements chlorine (Cl) and bromine (Br) are both halogen elements.

In VIIA or group 17 (halogen elements) there are six elements: fluorine (F), chlorine (Cl), bromine (Br), iodine (I), astatine (At) and tennessine (Ts).

They have high electronegativity because they have seven valence electrons in their outermost energy level, so they can gain an electron to have the octet rule.

Electronegativity is a chemical property that describes the tendency of an atom to attract a shared pair of electrons towards itself.

Chemical properties of these elements are similar, because they have the same number of valence electrons.

a) Nitrogen(N) and fluorine (F) are not in the same group of Periodic table of elements, so they have different properties.

b) Boron (N) and Si (silicon) are not in the same group of Periodic table.

d) Bromine and Kr (krypton) are different, because krypton is a noble gas.

e) Lithium (Li) and beryllium (Be) are not in the same group of Periodic table.

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Answer:

Explanation:

Magnetic field is the magnetism charge around a magnetic body

The correct way to complete this statement: when atoms combine to form compounds, they can share electrons.

An atom is a particle of matter that uniquely defines a chemical element. Atoms consist of a central nucleus surrounded by one or more negatively charged electrons. The nucleus is positively charged and contains one or more relatively heavy particles known as protons and neutrons.

Atoms formed shortly after the "Big Bang" billions of years ago. Atoms are made up of electrons that revolve around a nucleus containing protons and neutrons. The big bang created elementary particles such as electrons, protons, and neutrons. Things slowed down as the universe continued to expand and cool. It took 380,000 years for electrons to confine themselves in orbits around the nucleus to form the first atom. These are mainly helium and hydrogen, which are still the most common elements in the universe.

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