Use the virtual lab to prepare 150.0 ml of an iodine solution with a concentration of 0.06 g/ ml from the bottle of 0.12g/ml iodine solution

Answer:

2.28 g of CsF.

Explanation:

The following data were obtained from the question:

Molar mass of CsF = 151.9 g/mol.

Volume = 300 mL

Molarity of CsF = 0.05 M

Mass of CsF =.?

Next, we shall convert 300 mL to litre (L). This can be obtained as follow:

1000 mL = 1 L

Therefore,

300 mL = 300 mL /1000 mL × 1 L

300 mL = 0.3 L

Therefore, 300 mL is equivalent to 0.3 L

Next, we shall determine the number of mole CsF in the solution. This can be obtained as follow:

Volume = 0.3 L

Molarity of CsF = 0.05 M

Mole of CsF =.?

Molarity = mole /Volume

0.05 = mole of CsF /0.3

Cross multiply

Mole of CsF = 0.05 × 0.3

Mole of CsF = 0.015 mole.

Finally, we shall determine the mass of CsF needed to prepare the solution as follow:

Mole of CsF = 0.015 mole.

Molar mass of CsF = 151.9 g/mol.

Mass of CsF =.?

Mole = mass /Molar mass

0.015 = mass of CsF /151.9

Cross multiply

Mass of CsF = 0.015 × 151.9

Mass of CsF = 2.28 g

Therefore, 2.28 g of CsF is needed to prepare the solution.

Answer:

- Take 3.3 mL of 3.0-M hydrochloric acid and subsequently add 76.7 mL of water to complete the 100.00 mL.

- Take 11.7mL of 6.0-M hydrochloric acid and subsequently add 88.3 mL of water to complete the 100.00 mL

Explanation:

Hello,

In this case, given that the dilutions are preparedfrom 3.0-M and 6.0-M hydrochloric acid, we must proceed as follows:

- 3.0-M stock: when using this stock, the aliquot you must take is computed as shown below:

[tex]V_1=\frac{M_2V_2}{M_1}=\frac{100.00mL*0.70M}{3.0M}=23.3mL[/tex]

It means that you must take 23.3 mL of 3.0-M hydrochloric acid and subsequently add 76.7 mL of water to complete the 100.00 mL.

- 6.0-M stock: when using this stock, the aliquot you must take is computed as shown below:

[tex]V_1=\frac{M_2V_2}{M_1}=\frac{100.00mL*0.70M}{6.0M}=11.7mL[/tex]

It means that you must take 11.7mL of 6.0-M hydrochloric acid and subsequently add 88.3 mL of water to complete the 100.00 mL.

Regards.

it should be option A. H

[ because H gained oxygen ( O ) ]

Oxidation is defined by :

- the loss of electrons

- the loss of hydrogen ( H )

- the gain of oxygen ( O )

- increase in oxidation state

Reduction is defined by :

- the gain of electrons

- the gain of hydrogen ( H )

- the loss of oxygen ( O )

- decrease in oxidation state

(Basically, oxidation n reduction is opposite of each other)

The species being oxidized in the following reaction is Carbon Dioxide (CO2). This can be determined by looking at the oxidation states of the reactants and products.

In the reactants, Carbon Dioxide (CO2) has an oxidation state of +4, while Hydrogen (H2) has an oxidation state of 0. In the products, Carbon (CO) has an oxidation state of +2, and Water (H2O) has an oxidation state of -2.

The net change in oxidation states between the reactants and products is a decrease of 6, which means that the species that was being oxidized is Carbon Dioxide (CO2). The oxidation state of a species can be determined by looking at the number of electrons it has gained or lost in a reaction.

In this reaction, Carbon Dioxide (CO2) has lost 6 electrons, which is a sign that it is the species being oxidized. This is further evidenced by the fact that Carbon (CO) and Water (H2O) have gained electrons, meaning that they are the species being reduced. Therefore, the species being oxidized in the following reaction is Carbon Dioxide (CO2).

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Answer:

Explanation:

An electric light bulb is turned on.   Thermal heat , radiant light

A log is burned in a fireplace .  Thermal heat        , radiant light

A green plant grows  Chemical

A bicycle is pedaled  Mechanical ,

A flashlight is turned on.   radiant light

Answer:

A. is the answer i think

Explanation:

Answer: The mass number is the sum of the numbers of protons and neutrons present in the nucleus of an atom.

I hope that this helps you !

Answer:

B. Tell the instructor

Explanation:

Always to the instructor about any accidents happens in a lab.

Answer:

B

Explanation:

Just helping out:)

The correct answer is 0.72 g/cm3

Explanation:

The density of a material depends on both its mass (amount of matter), which is usually provided in grams (g), and its volume (space occupied), which is provided in units such as cubic centimeters cm3. Moreover, to find how dense the material is, take the mass and divide it into the volume. The process for finding the density of the block of wood is shown below:

[tex]d = \frac{m}{v}[/tex]

[tex]d = \frac{46 g}{64 cm3}[/tex]

[tex]d = 0.718 g/cm3[/tex]

This means the density is 0.71g/cm3 and this can be rounded to 0.72 g/cm3

Answer:none of the above

Explanation:

The complementary base sequence to GTAGCT is C-A-T-G. Therefore, option E is correct.

If the base sequence of the other strand is known, complementary base pairs allow the sequence of one strand to be predicted. In DNA, complementary base pairing is crucial because it enables the base pairs to be put in the most energetically advantageous configuration.

Reverse transcriptase, a DNA polymerase that can use either DNA or RNA as a template, creates complementary DNA (cDNA), a DNA copy of a messenger RNA (mRNA) molecule.

The nitrogenous bases' adenine, thymine, cytosine, and guanine are referred to as complementary base pairs. Adenine will always pair with its complementary base, thymine, and cytosine will always couple with its complementary base, guanine, in a double strand of DNA.

Thus, option E is correct.

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Answer:

6 moles

Explanation:

Forst of all arrange the equation, it isn't in the right order and I suppose the equation is of aerobic respiration:

That is :

C6H12O6 + 6O2 ---------> 6CO2 + 6H20 + 2830kJ (energy)

Then use the ratio which can be seen by the balancing:

02 : CO2

6: 6

The ratio clearly shows how much moles of CO2 are produced; 6 moles

The term mole concept is used here to determine the moles of carbon dioxide produced. The moles of CO₂ produced from the given reaction is 6.

One mole of a substance is defined as that quantity of it which contains as many entities as there are atoms exactly in 12 g of carbon - 12. The formula used to calculate the number of moles is:

Number of moles = Given mass / Molar mass

The balanced equation for the oxidation reaction of glucose is given as:

C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + E

In a balanced equation the number of atoms of reactants and products on both sides of the equation are equal. The number of 'C', 'H' and 'O' atoms on both sides of the equation are equal.

Here the number of moles of CO₂ produced from 6 moles of oxygen is 6.

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Given :

Three block of same mass name A , B and C .

Sides of block A , B and C is 3.0 cm , 5.0 cm and 10.0 cm .

To Find :

Which block has the higher  density .

Solution :

We know , density [tex]\rho[/tex] is given by :

[tex]\rho=\dfrac{M}{V}[/tex]   ......1 )

Here , V is volume .

Now , volume V for cube is given :

[tex]V=a^3[/tex]    .......2 )

(  Here , a is the side of cube )

Now ,form equation 1 we can see if mass remains constant then density decrease with increase in volume.

Therefore , cube with minimum side will have higher density , in this case it is 3 cm block .

Hence , this is the required solution .

Answer:

Silicon atoms have 14 protons.

Silicon atoms will react with other atoms in order to gain stability.

Silicon atoms have 14 electrons.

Answer:

1. electrons and neutrons protons

2. true

3. electrons are negative and neutrons are neutral

4. true

5. the total number of neutrons and protons

Explanation:

Answer:

b=200

l=100

Explanation:

so since it is a square all sides would be equal

when you cut the square vertically the dimensions will change

the bredth would be same that is 200

but the length would be half that is 100

Answer:

Gases in Earth's atmosphere form a protective layer

Nitrogen, oxygen and ozone molecules in the upper atmosphere and stratosphere absorb ultraviolet light from the Sun, providing a shield that prevents this radiation from passing to the Earth's surface.

Explanation:

i got this from  

...www.aeronomie.be

Answer:

Explanation:

A student obtains a clean, dry graduated cylinder. She weighs the cylinder and finds the mass to be 32.64 g. She then fills the cylinder with a certain volume of water. She weighs the water-filled cylinder and finds the total mass to be 61.57 g. If the density of the water in the laboratory is 0.9975 g / mL , what is the volume of the water in the graduated cylinder?

Answer:

Volume of water =29.00mL

Explanation:

mass of cylinder (Mc)=32.64g

mass of water-filled cylinder (Mw+c)=61.57g

mass of water (Mw)= (Mw+c) - (Mc).

=(61.57 - 32.64)g = 28.93g

However:

Density = mass÷volume

hence Volume of water = mass of water÷density of water.

28.93g÷0.9975g/mL = 29.00mL

Answer:

A mixture has 2 or more substances that are physically combined

Explanation:

Examples:

-Dirt and water (Mud)

-Water and salt (Sea water)

-Smoke and fog (Smog)

The mixture that has been heterogeneous has been oil and water. Thus, option A is correct.

The mixture has been defined as the combination of two or more substances. The mixture has been categorized as pure and heterogeneous mixture based on the solubility of the constituents.

The pure mixture has been defined as the one in which the constituent substances are completely soluble, and are not visible with the bare eyes.

The heterogeneous mixture has been defined as the combination in which the constituents elements are not completely soluble and are easily differentiated from each other by physical means.

Thus, the mixture that has been heterogeneous has been oil and water. Thus, option A is correct.

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Answer:

The correct answer is - b. transmission electron microscope.

Explanation:

A transmission electron magnifying instrument fires a light emission through an sample to create an amplified and magnified picture of a specimen.

The transmission electron magnifying instrument is utilized to see thin slices of specimen or specimen smaller than 100 nm through which electrons can pass and form a image of specimen. The TEM is comparable to from various perspectives to the ordinary light magnifying instrument.

Thus, the correct answer is - b. transmission electron microscope.

Answer:

dispersion forces

Explanation:

SO3 is a trigonal planar molecule. All the dipoles of the S-O bonds cancel out making the molecule to be a nonpolar molecule.

The primary intermolecular force in nonpolar molecules is the London dispersion forces. As expected, the London dispersion forces is the intermolecular force present in SO3.

Hence SO3 is a symmetrical molecule having only weak dispersion forces acting between its molecules.

The intermolecular bond in the sulfur trioxide has been the dispersive force. Thus, option C is correct.

The sulfur trioxide has been the nonpolar molecule with the presence of S-O and S=O bonds.

The nonpolar bonds have consisted of weak intermolecular interactions resulting from the London Dispersive force. This type of interaction has been able to bind the nonpolar molecules together.

Thus, the intermolecular bond in the sulfur trioxide has been the dispersive force. Thus, option C is correct.

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Answer:

The numeric value is 1.

Explanation:

We have given that the “a” equal to “b” which means we can replace the “a” with “b” or we can replace the “b” with “a”.  

The given condition or quantity = a/b.

Now it is required to find the numeric value of a/b.  

To find the numeric value we first replace the “b” with “a” and then divide the values. Since we know that if the numeration and denominators are the same then after dividing the value, the resulting value will be 1.

The numerical value = a/b = a/a = 1

Answer:

Potential energy can be defined as the energy in a body due to its position

In simple terms potential energy is the energy at rest

Explanation: Examples ;

Answer:

IR spectroscopy can be used to identify chemical structures are present in compounds.

Explanation:

Infrared spectroscopy is a technique in organic chemistry that can be use use to identify chemical structures present in compounds because it is base on the ability of different functional groups to adsorb infrared light.

This work by shinning the infrared lights into the organic compounds to be identified, some of the frequencies of the infrared lights are adsorbed by the compounds and its identify groups of atoms and molecules in the compound.

Answer:

B. Chlorine has more than one stable isotope that occurs naturally.

D. As fluorine only has one isotope the atomic mass is identical to the mass of the isotope.

Explanation:

The reason for the difference seen between the atomic mass provided in the periodic table and the atomic mass of each element is that most naturally occurring elements have more than one isotope (isotopes are atoms that have the same atomic number but different mass numbers). This means that when we measure the atomic mass of an element, we must generally settle for the average mass of the naturally occurring mixture of isotopes.

¹⁹F is the only stable isotope of fluorine, and its abundance is 100%. Therefore, its atomic mass is identical to that of the isotope.

On the other hand, chlorine has two stable isotopes ³⁵Cl (75.77%) and ³⁷Cl (24.23%). The atomic mass of  ³⁵Cl has been determined to be 34.96885 amu, and the atomic mass of ³⁷Cl has been determined to be 36.96590 amu. Thus, the average atomic mass  of chlorine can be calculated as follows:

average atomic mass  of natural chlorine = (0.7577)×(34.96885 amu) + (0.2423)×(36.96590 amu)  = 35.45 amu

Note that in calculations involving percentages, we need to convert percentages to  fractions.

Answer:

True

Explanation:

In a chemical reaction, there's usually something to do with the composition of the substance. In a physical reaction, the effect could have something to do with appearance or smell.

Hope this helps!

Answer:

Non-polar compounds: [tex]CCl_4[/tex], [tex]O_2[/tex], [tex]CO_2[/tex]

Polar compounds: [tex]CH_3Cl[/tex], [tex]H_2O[/tex]

Explanation:

For this question, we must start with the Lewis structure for each molecule and then we can do their respective analysis:

-) [tex]CCl_4[/tex]

In this case, we have 4 equal atoms attached to the central atom. Therefore, we have the same magnitude of electronegativity. Chlorine atoms have different and opposite directions. Therefore due to the orientation the dipole moments cancel and the net dipole moment will be zero and the molecule will be non-polar.

-) [tex]O_2[/tex]

In this case, we have a linear structure in which the magnitude of the dipole moment is the same, but the direction is the opposite. Therefore the dipole moments are canceled and the molecule will be non-polar.

-) [tex]CO_2[/tex]

In this case, we also have a linear structure in which the magnitude of the dipole moment is the same, but the direction is the opposite. Therefore the dipole moments are canceled and the molecule will be non-polar.

-) [tex]CH_3Cl[/tex]

For this molecule, we have a different atom. The hydrogen atom, therefore the magnitude of one of the atoms attached to the central atom is different and the magnitude of the net dipole moment will be different from zero and the molecule will be polar.

-) [tex]H_2O[/tex]

For this molecule, due to the structure of the molecule, the dipole moments of oxygens will not have a totally opposite configuration. Therefore, the net dipole moment will be different from zero and the molecule will be polar.

See figure 1 to further explanations

I hope it helps!

Answer:

greenhouse effects are molecules that trap heat on earth atmosphere

Answer:

play an important role in Earth's climate.

Explanation:

Greenhouse gases are certain molecules in the air that have the ability to trap heat in the Earth's atmosphere. Some greenhouse gases, like carbon dioxide (CO2) and methane (CH4), occur naturally and play an important role in Earth's climate. If they didn't exist, the planet would be a much colder place.

Answer:

The main reason that NO, has a higher boiling point than CO is that NO has a larger molar mass.

The main reason that NH3 has a higher boiling point than CH4 is that NH exhibits hydrogen bonding.

The main reason that CS2 has a higher boiling point than CO2 is that CS2 has a larger molar mass.

Explanation:

The larger the molecular mass, the greater the surface area of the molecule and the greater the magnitude of dispersion forces. Hence, among nonpolar molecules, increase in molecular mass leads to a higher boiling point due to stronger dispersion forces.

Though CO and NO possess dipole-dipole forces, NO has a greater molar mass than CO, hence it has a higher boiling point than CO.

NH3 exhibits intermolecular hydrogen bonding hence it has a much higher higher boiling point than CH4 irrespective of the fact that their molar masses are close in magnitude.

Answer:

The main reason that NO2 has a higher boiling point than CO2 is that NO2 exhibits dipole-dipole forces.

The main reason that CS2 has a higher boiling point than CO2 is that CS2 has a larger molar mass.

The main reason that NH3 has a higher boiling point than CH4 is that NH3 exhibits hydrogen bonding.

Answer: 6

Explanation: Because there is a decimal point, the zero after is included. The first 5 numbers are significant because they aren’t zero. Zeros are included if there is a decimal point (13.0, 160.0) or are in the middle of a number (16007, 101). They are not included if they are before a decimal (000.0081, 0.000021)-(there are only 2 sig figs in these: the actual numbers) or after a number without a decimal (15840000, 100)-(all the zeros in these numbers are not significant).

Answer:

15.0g/L is the concentration of nickel(II) chloride contaminant in the original groundwater sample.

Explanation:

Based on the reaction:

NiCl2 (aq) + 2AgNO3 (aq) -> 2AgCl (s) + Ni(NO3)2 (aq)

Where 1 mole of NiCl₂ reacts producing 2 moles of AgCl.

To solve this problem, we need to convert mass of AgCl to moles to know the moles of NiCl₂ that reacts. With these moles and the volume of the sample (250mL = 0.250L), we can determine the molar concentration of the contaminant in the sample

Moles AgCl:

8.3g of AgCl were collected. In moles (Molar mass AgCl: 143.32g/mol):

8.3g AgCl * (1mol / 143.32g) = 0.05791 moles AgCl

Moles NiCl₂:

As 2 moles of AgCl are produced from 1 mole of NiCl₂. Moles of NiCl₂ are:

0.05791 moles AgCl * (1 mole NiCl₂ / 2 moles AgCl) = 0.02896 moles NiCl₂

Molar concentration:

0.02896 moles NiCl₂ / 0.250L =

0.1158M

In g/L (Molar mass NiCl₂: 129.6g/mol):

0.1158 mol / L * (129.6g / mol) =