when is it important to wear safety goggles in the laboratory? group of answer choices when using liquid chemicals in the lab. when i start pouring or transferring chemicals at the lab bench. any time there are chemicals or laboratory equipment present in the lab. only when my lab ta tells me to. as soon as my lab partners put on their goggles. flag question: question 2

To reach the create an object with symmetry, 184 mL of base, LiOH have been needed.

Chemicals that react with hydrogen atoms to neutralize acids are known as bases. The bulk of bases are composed of minerals, which react with acids to form water and salts. As examples of bases, consider the metal oxides, hydroxides, and calcite. The soluble bases are the alkalis.

One of the core units that can be used to create other units in a measurement system that relies on a phenomena or accepted norm. The metre, kilogram, second, ampere, farenheit, mole, and candela are the foundational elements of the World System of Units.

Acid volume, HCOOH (Vi) = 69.0 mL

Acid molarity is HCOOH (Milliamperes) = 0.4 M.

LiOH (Mb) has a molarity of 0.150 M.

MaVa / MbVb = nA / nB

(0.4 × 69) / (0.150 × Vb) = 1

27.6 / (0.150 × Vb) = 1

0.150 × Vb = 27.6

Divide both side by 0.150

Vb = 27.6 / 0.150

Vb = 184 mL

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Answer:babb

Explanation:

here is the following explanation part:

However, I found similar question to this one, and hope this can helps you. If it's other compound and reactive, tell me to fix it

Now, according to picture 1 (the question), we have alkene reacting with the acid.

This are conditions for reactions similar to the SN1 reactions, so, this reaction follows marknonikov's rule which states that hydrogen will always go to carbon with more hydrogens, while the halide, will goe to the most stable carbon cation.

According to this, mechanism, intermediates and product of reaction is as follow in picture 2.

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A species that contains a lone (unpaired) electron is referred to as a radical.

A radical is also known as a free radical which can be any atom, ion or molecule having atleast one unpaired valence electron.

When homolysis of a weak covalent bond takes place in presence of heat or sunlight (because breaking a bond requires energy) , two new radicals are formed. Also, in an ionic bond due to electron transfer between two atoms of different valencies and electronegativity, the respective atoms involved in that particular bond dissociates to form radicals. Radicals are also formed in reactions like addition, substution and elimination.

for example : The homolysis of the Br₂ bond forms two Br° radicals

Br-Br + hν → Br° + Br°

In the dissociation of the ionic bond NaCl, Na is the basic radical or cation and Cl is the acid radical or anion

NaCl → Na° + Cl°

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Calculating the tension of hydrogen gas gathered over water is possible using Dalton's Law of Equivalent Pressures.

Around room temperature and pressure, hydrogen is a gas, but at -423 degrees Fahrenheit, it condenses into a liquid (minus 253 degrees Celsius).

The gasoline for engines with internal combustion can also be hydrogen. These, however, are less effective than FCEVs and emit tailpipe pollutants. Try reading up on fuel cells. A gallon of gasoline (6.2 kilograms, 2.8 kilograms) has approximately the same amount of energy as 2.2 gbp (1 kilogram) of hydrogen.

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The argon inside the container had a pressure of 101 mm Hg, according to the equation.

Stress is a term used to describe a physical force imparted to an item. A horizontal force is exerted per unit area to an object's surface. The basic formula for pressure is G n. (Force per unit area).

An SI unit of pressure, the pascal (abbreviated as Pa), is equal with one newton every sq.m (N/m2 or kg m-1s-2). Surprisingly, this name was chosen in 1971.

The height of the mercury level difference is

    h=10.1cm

With multiplying it by 10, we may translate it to millimeters.

     h=10.1*10=101mm

The closed manometer's pressure would be equal to its height.

P(gas)=h

P(gas)=101mmHg.

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The pH in the anode compartment is 3.01.

What is electrolysis?

The process of splitting water into hydrogen and oxygen using electricity is known as electrolysis. This reaction takes place in a device known as an electrolyzer.

What happens in electrolysis at anode?

The anode is the positive polarity contact in an electrolytic cell and is where oxidation occurs. The electrical potential forces anions (negative ions) to react chemically and give off electrons (oxidation) at the anode, which then flow up and into the drive circuit.

Reaction at anode:

[tex]2H_2O[/tex]   →   [tex]O_2 + 4H^+ + 4e^-[/tex]

Time = 5mins = 5 * 60s = 300s

Charge Q = I * T (current * Time)

Q = 0.0250 * 300 = 7.5C

Charge of single electron = [tex]1.6 * 10^-^1^9 C[/tex]

no. of electrons = total charge Q / charge on single electron

no. of electrons = 7.5 /  [tex]1.6 * 10^-^1^9 C[/tex] = [tex]4.69 * 10^1^9[/tex]

Moles of electrons = no. of electrons / Avagadro no.

Moles of electrons = [tex]\frac{4.69 * 10^1^9 }{6.022 * 10^2^3}[/tex] = [tex]7.78* 10 ^-^5[/tex]

Given :

volume of solution = 80.0ml = 0.080l

According to the above reaction,

No of mole of [tex]e^-[/tex] = No. of mole of [tex]H^+[/tex]

Molarity of  [tex]H^+[/tex] = moles of  [tex]H^+[/tex] / volume of solution

Molarity of  [tex]H^+[/tex] = [tex]\frac{7.78 * 10^-^5}{0.080}[/tex] = [tex]9.73 * 10^-^4M[/tex]

So,

pH = -log ([tex]H^+[/tex])   = -log( [tex]9.73 * 10^-^4M[/tex])

pH = 3.01

The pH in the anode compartment is 3.01.

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My conclusion about the current stage of development of embryo's image shown above simply is that:

A spinal column is present.

The correct answer choice is option a.

The spinal column simply refers to the bones and other structural substances in the central axis of the skeleton which runs from the base of the skull and extends down to the the tailbone. The spinal column is also known as the vertebral column.

That being said this vertebral or spinal column is found in all animals which possess an axial stiffening known as notochords and in all vertebrate animals ( animals with backbones ). However, this spinal column is well observed and confirmed to be present in the development of the embryo above.

In conclusion, we can now confirm from all said and done above that the spinal column gives protection to the spinal cord.

The image is attached.

Complete question:

The image shows a week-old chick embryo. What can you conclude about its current stage of development?

a. A spinal column is present.

b. The chick will develop four limbs and a beak.

c. It’s an invertebrate.

d. It’s sexually mature.

e. It’s about to undergo a metamorphosis

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Dehydration of 3-methyl cyclohexanol would yield two products: 3-methyl cyclohexene and 3-methyl cyclohexanone. The product that would predominate would be 3-methyl cyclohexene.

This is due to the fact that the reaction of dehydration proceeds through an E1 mechanism, which favors the formation of the more substituted alkene due to an energy difference between the two products. The reaction would look like this:

3-methylcyclohexanol  -> 3-methylcyclohexene + H₂O.

The dehydration of alcohol proceeds with the formation of a carbocation intermediate, which is stabilized by the presence of the methyl group on the cyclohexane ring.

This stabilization allows for the formation of the more substituted alkene, which has lower energy than the other product.

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When two or more nonmetal atoms share valence electrons, the product formed is covalent compound. Therefore, option C is correct.

An electron exchange that results in the formation of electron pairs between atoms is known as a covalent compound. Bonding pairs or sharing pairs are the names given to these electron pairs.

Covalent bonding is the stable equilibrium of the attractive and repulsive forces between atoms when they share electrons.

One positive and one negative ion are created as a result of this. Ionic bonds are created when opposing charges attract one another. Covalent Bonds are Non-metals can join together to form covalent bonds. When non-metals share their valence electrons, covalent bonds are created.

Thus, option C is correct.

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Its binding energy is 1020 MeV per kilojoule. Enter your response using the exponential notation (1.23e4), three significant figures, and no units. Utilize the masses: 1h atom mass.

Given: an In-120 atom weighs 119.907890 amu.

In-120 has 49 protons and 49 electrons in each atom.

quantity of neutrons = (mass number) - (number of protons) (number of protons)

quantity of neutrons = (120) - (49) (49)

71 neutrons are present.

Number of electrons/protons times mass of a 1H atom equals mass of electrons and protons. Therefore, the mass of electrons and protons is equal to (49) * (1.007825 amu), or 49.383425 amu.

Number of neutrons multiplied by the mass of a neutron yields the mass of neutrons as (71) * (1.008665 amu), or 71.615215 amu.

Mass overall = (mass of electrons and protons) - (mass of neutrons) (mass of neutrons)

Total mass equals 49.383425 amu plus (71.615215 amu)

120.99864 amu is the total mass.

Mass change is equal to (Total mass) - (mass of a In-120 atom)

(120.99864 amu) - change in mass (119.907890 amu)

mass change = 1.09075% amu

Change in mass equals 1.09075 amu * (931.5 MeV/c2 / 1 amu)

= 1016 MeV/c2 change in mass

binding energy is equal to (change in mass) times (light speed) squared.

bound energy = (1016 MeV/c2) * (c)

= 1020 MeV for binding energy.

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Answer:

Explanation:

The knowledge of venom composition as well as structure and properties of its components on the one hand may give the clue for better treatment of bites and stings on the other hand it may lead to the discovery of new medicines.

An alternating copolymer is known to have a number-average molecular weight of 250,000 g/mol and a degree of polymerization of 3420. if one of the repeat units is styrene, which of ethylene, propylene, tetrafluoroethylene, and vinyl chloride is the other repeat unit? why?'

Propylene (C3H6) is a colorless gasoline gas with a naturally stinky odor. even though just like propane, it has a double bond which gives it a combustion gain i.e. it burns warmer. This fuel gasoline is extremely flammable and non-poisonous. Propylene is obtained throughout the refining of gas.

Gasoline is a aggregate of many different hydrogen- and carbon- containing chemicals (hydrocarbons). a typical fuel mixture includes about one hundred fifty exclusive hydrocarbons, including butane, pentane, isopentane and the BTEX compounds (benzene, ethylbenzene, toluene, and xylenes)

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red<yellow<green<blue<violet are the colors.

The light spectrum contains waves with specific wavelength which can be classified into groups. Most of the groups are invisible to the eye (like infrared, microwaves, radio waves, gamma rays, etc.) however, there is one group that is known as visible light.

Visible light allows us to see colors from red all the way to violet. The colors have different frequencies and wavelengths. The wave with the highest frequency also has the highest energy (which in this case is violet). Hence, as the frequency decreases, the energy will also decrease, making violet have the highest energy, and red have the lowest energy.

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When a material is cooled from a temperature of 225 ° c temperature to 25 oC, 160 j worth heat energy are released. H=0.17 J/g*C is the metal's specific heat capacity if its mass is 5.0 g.

Heat is the interchange of "thermal" energy caused by a temperature difference. Consider a system that is isolated and has two components that are initially running at different temperatures. Energy is transmitted from the large heat subsystem 2 to the cooler temperature subsystem.

heat energy=160 J released

=5.0 g metal

=A temperature change of (225-35) or 190C.

=160J/(5.0g*190C) = 0.1684 J/g*C

H= 0.17 J/g*C

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To Find:

Formula used:

0°C = 273 K

So, 17°C = 290 K

Let the volume of gas be V

Using the formula, we get

0.6 x V = 2.5x0.082x290

V = 2.5x0.82x290/6

V = 99.08 Litres

So, volume of gas will be 99 litres approx.

Carbon dioxide is created by burning a 6.0 g sample of carbon. The reaction only produces a 60% yield. Actual carbon dioxide production was 13.2g.

C + O2 = CO2

Moles of C in 6.0g = 6.0/12 =  0.5 moles

as 1 moles of C gives 1 mole of CO₂

Thus 0.5 moles of C will give 0.5 moles of CO₂

As, CO₂ produce is 60%

Thus, moles of CO₂ produced=(0.5x60)/100 = 0.3 moles of CO₂

Amount of CO2 produced=  Moles x Molecular mass

= 0.3 × 44

= 13.2g

Thus, 13.2g of CO₂ will be produced.

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The nucleus in question has a binding energy of 7.88 MeV/nucleon.

The subatomic particles that make up an atom's nucleus are known as nucleons. Protons and neutrons are nuclear particles.

We are given a nucleus having representation:   206 Pb

Number of protons = 82

Number. of neutrons. = 206 - 82 = 124  

Δm = [(np × mp) + (nn × mn) - M

where,

np = number of protons = 82  

mp = mass of one proton  = 1.007825 amu

nn = number of neutrons  = 124  

mn = mass of one neutron = 1.008665 amu

M = nuclear mass = 205.974440 amu  

Δm = [(82 × 1.0078725) + (124 × 1.008665)] - 205.974440

Δm = 1.74167amu

the binding energy of the nucleus, we use the equation:

E = Δm[tex]c^{2}[/tex]

E = (1.74167u) × [tex]c^{2}[/tex]

E = 1622.36MeV

1u = 931.5 MeV/[tex]c^{2}[/tex]

Number of nucleons in Fe atom = 206

the number of nucleons divided by the binding energy per nucleon yields:

Binding energy per nucleon = binding energy /nucleons = 7.88MeV/nucleon

binding energy is the amount of energy needed to separate a particle from a system of particles or to disperse all the particles in the system. Particularly relevant cases of binding energy include subatomic particles in atomic nuclei, electrons attached to atoms' nuclei, and atoms and ions bonded together in crystals.

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Aseptic process involves sterilizing the package and food separately and then packaging the food. So the option C is correct.

Aseptic manufacturing requires constant environmental monitoring, specially trained and experienced workers to perform the operations, specialized equipment, and cleaning procedures. If the aseptic process is compromised, there is a serious risk to both the product and the patients.

Aseptic process is a process which involves placing of a sterilized product into a sterilized package and then sealing the product under the sterilized conditions. It ensures that the product is without any bacteria. Many products degrade when gone through the harsh conditions of sterilization but aseptic processes allows the safe production of all those products.

Aseptic packaging is also a type of thermal sterilization. It is process in which commercially sterilized food item is placed in a sterilized package followed by sealing under aseptic environment. It is highly recommended for the preservation of tomato paste, and fruit juices.

Heat treatment, chemical application, or both can be utilized for sterilization in this process. Paper and plastic are generally used in conventional aseptic packaging.

Basically, there are two approaches of aseptic packaging:

composed of steam infusion and steam injunction

comprises scrapped surface heat exchanger, plate heat exchanger, and tubular heat exchanger

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As a result, there is a net change in enthalpy of -376 kJ for the synthesis of one mole of nitric acid from nitrogen, hydrogen, and oxygen. Hess's constant heat summation law states.

No matter if a chemical reaction involves one step or numerous, the amount of heat absorbed or evolved remains constant. The heat absorbed or evolved in a particular chemical equation is the same whether the process takes place in one step or numerous steps, according to Hess's law of constant heat summation.

The enthalpy change for steps 1 through 3 is equal to 1/2*(-92)+(-330) = -376kj. Step 1's enthalpy change is -92kj. Step 2's enthalpy change is -330kj.

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Volume of 2 L soda bottle contain 0.091 ounce mass of air.

Volume given 2 L

and, We know that density of air is 1.29 g/L

So, Density of air = mass of air/volume of air

Thus, 1.29 = mass of air/2

Mass of air = 2.58 g

In ounces; 1 g = 0.35 ounces

so 2.58 g = (2.58 × 0.35) ounces = 0.091 ounces

Hence volume of 2 L of soda bottle contain 0.091 ounces of mass.

What is Density ?

Density, mass of a unit volume of a material substance. The formula for density is d = M/V, where d is density, M is mass, and V is volume. Density is commonly expressed in units of grams per cubic centimetre.

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The characteristics of oxymercuration-demercurations are Markonikov with no rearrangement possible.

Oxymercuration-demercuration is a reaction sequence used to convert an alkene into an alcohol. The reaction sequence involves two steps. In the first step, the alkene is treated with mercuric acetate (Hg(OAc)2) in the presence of base and a protic solvent, resulting in the formation of a mercurial (Hg-C) intermediate. In the second step, the mercurial intermediate is treated with aqueous sodium borohydride (NaBH4), which reduces the mercurial intermediate to an alcohol.

The reaction is stereo-selective, meaning that it usually produces a single stereoisomer of the alcohol product. This is because the mercurial intermediate is planar, and the presence of the bulky Hg atom helps to prevent the alkene from rotating when it is attacked by the nucleophile.

The reaction is also regio-selective, meaning that one of the double bonds of the alkene is attacked preferentially over the other. This is because the mercurial intermediate is formed in such a way that one of the double bonds is more favorable to attack than the other.

Finally, the reaction is also chemo-selective, meaning that it only reacts with alkenes and not other functional groups. This is because the reaction mechanism involves a strong electrophile-nucleophile interaction between the Hg atom and the alkene, which is not present with other functional groups.

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The volume of water and alcohol present in 635 mL of this solution are 381 mL and 254 mL respectively.

As we are given that 40.0 % (v/v) alcohol solution. That means, 40.0 mL of alcohol present 100 mL of solution.

Now we have to calculable the volume of alcohol in 635 mL solution.

As, 100 mL of solution contains 40.0 mL of alcohol

So, 675 mL of solution contains (635/100)*40 = 254 of alcohol

Thus, the volume of alcohol = 254 mL

Now we have to calculate the volume of water.

Volume of water = Volume of solution - Volume of alcohol

Volume of water = 635 mL - 254 mL

Volume of water = 381 mL

Thus, the volume of water = 381 mL

Therefore, the volume of water and alcohol present in 635 mL of this solution are 381 mL and 254 mL respectively.

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The high energy molecules escape from the surface of the bromine, this is due to bromine's high volitivity (which is due to its weak intermolecular forces).

What is  Brownian motion ?

In chemistry, the term "Brownian Movement" refers to a particle's zigzagging motion that is thought to be random and is typically seen under an ultra-high power microscope. The term "Brownian movement" refers to the movement that exactly matches Robert Brown's explanation of the motion of pollen grains in water.

What is energy?

The energy that is contained in chemical compound bonds is referred to as chemical energy (molecules and atoms). In what is referred to as an exothermic reaction, it is released during the chemical reaction and mostly generates heat as a byproduct.

Firstly, the high energy molecules escape from the surface of the bromine, this is due to bromine's high volitivity (which is due to its weak intermolecular forces).

Then due to Brownian motion (the random motion of microscopic particles) there is a net movement of bromine molecules from the region of high concentration (the area above the liquid bromine) spreading out into an area of low concentration. (the rest of the container).

Therefore,  the high energy molecules escape from the surface of the bromine, this is due to bromine's high volitivity (which is due to its weak intermolecular forces).

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The mass of solute needed to prepare 1.575 l of 0.00250 m naclo3 is 0.419g.

1.575 L x 0.00250 mols / L x 106.45 g / mol = 0.419 g.

Sodium chlorate is used as an oxidizer in the manufacture of dyes, explosives, and matches. mass of solute= volume of solution× concentration of solution. Mass of solute plus mass of solvent equals mass of solution. Calculating the mass/mass percent is simple if you are able to measure the masses of the solute and the solution. To calculate the correct concentration, all masses must be stated in the same units. Another type of % concentration is known as mass/volume percent, which compares the volume of the solution to the mass or weight of the solute in grams (for example) (e.g., in mL).

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The correct steps in Polymerase Chain Reaction (PCR) are as follows: denaturation, annealing, and extension. Hence, the answer is C.

Polymerase Chain Reaction (PCR) requires 3 steps for any DNA synthesis reaction, which are:

By the steps described above, we can conclude that the correct answer is C. Denaturation, annealing, extending.

The question seems incomplete. The complete query is as follows:

“The correct order of steps in Polymerase Chain Reaction (PCR) is:

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False, the flavors of frozen desserts are more pronounced when they are very cold. It is False because it is against of weather. It will not suit to our health. So nobody will prefer it.

What is the Weather?

Weather is the phase of the atmosphere, describing for example the measure to which it is hot or cold, wet or dry, calm or stormy, clear or hazy.

What is Health?

WHO describes health as a state of overall physical, mental and social goodness and not merely the default of disease or weakness.

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If the bond angle between two adjacent hybrid orbitals is 109. 5°,then hybridization is sp3 or tetrahedral geometry.

Tetrahedral molecules contain uniform bond angles and no nonbonding electron pairs. Because of this, they can only be asymmetric if one atom is different from the rest.

A symmetrical nonpolar molecule can become asymmetric by adding a new atom to the vicinity; however, if the new atom's electronegativity sufficiently differs from the original atom's, the nonpolar molecule turns polar.

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