If the density of a piece of an object is 2.16 g/cm³, will the item float or sink in pure water?

According to Charles' law, with consistent pressure, the volume of an excellent gas gains in direct ratio to the absolute temperature.

At 35°C, the weather balloon holds 20.67 L of helium.

[tex]\frac {V_{1}}{T_{1}}[/tex]=[tex]\frac {V_{2}}{T_{2}}[/tex]

[tex]V_{1} = first volumeV_{2} = second volumeT_{1} = first temperatureT_{2} = second temperature[/tex]

[tex]V_{2} =\frac{ V_{1} X T_{2}}{T_{1}}[/tex] temperature are in  kelvin. Here's the formula to convert Kelvin to Celsius: ° C = K − 273.15

[tex]V_{2}[/tex] = 20.67 L

The volume of helium in the weather balloon at 35C is  20.67 L.

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These glasswares can be ranked from the least accurate (1) to the most accurate (3) as follows;

Beaker - 1

Graduated cylinder - 2

Volumetric pipette - 3

The beakers are considered to be the least accurate since they are in graduations of 25 or 50 ml. They are also not calibrated during manufacturing.

Graduated cylinders are more precise than beakers since they have permanently marked incremental graduations incorporated in the cylinder hence making them more accurate at reading the volumes of the inside liquids.

Volumetric pipettes are the most accurate as compared to the other two given glassware as they allow the measurement to four significant figures and have an error of a few hundredths of a milliliter.

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Dehydration reactions create covalent bonds which link monomer units.

In organic chemistry, monomers are single-unit compounds that join with other compounds through covalent bonds.

When multiple units of monomers join they form giant molecules called polymers.

In glucose, monomers are joined together through glycosidic linkages and join to form large complex molecules or polymers such as starch, glycogen, and cellulose.

Similarly, in biochemical reactions, a dehydration reaction occurs between glucose and fructose monomers, where a small water molecule is produced as a byproduct. Sucrose is formed as a result of a dehydration reaction.

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Answer:

??? im confused

Explanation:

Avogadro's number is the number of atoms, molecules, ions, formula units, or other particles in a mole of a substances.

Avogadro's number can be defined as the number of units in one mole of substances. it is represented by N and is equal to 6.023 ×  10²³.

Avogadro's number is the no. of particles in one mole of any substance. The conversion between moles and grams depends on the Avogadro's number. Avogadro's constant also called as Avogadro's number represented the no. of particles. it was named in honor of an Italian scientist , Amadeo Avogadro di Quarengna.

Thus, Avogadro's number is the number of atoms, molecules, ions, formula units, or other particles in a mole of a substances.

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Answer:

C. the number of atoms, molecules, ions, formula units, or other particles in a mole of a substance

Explanation:

Got it right on edge

Answer: 2 significant figures

the number 78 has 2 significant figures

Significant figures are the number of digits, starting at the first non-zero digit. A zero after a non-zero number, like anything not zero, which is not a decimal, is not counted as a significant figure. So the first non zero, non decimal is 7 and the next is 8. There are no more numbers after that.

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The most stable isotope among the the isotopic substance given from above is Plutonium-238.

The correct answer choice is option d.

Isotopy is the existence of a chemical element which result to having the same atomic number but different mass number.

From the given task above, the only isotope which is most stable is the Plutonium-238. This is because this isotope has a half life of alot of years; specifically; about 82,000,000 years.

Another interesting thing of factor which makes Plutonium-238 the most state from above is that Plutonium-238 itself decays into uranium-240 through alpha radiation.

There are three different types of radiation in science, these are as follows:

In conclusion, we can now deduced from the above solution that Plutonium-238 is the most stable isotope from above.

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When dye changes its solid state to a liquid state is called melting.

What do you understand by melting point?

The melting point is the temperature at which the solid transforms into liquid under atmospheric pressure.

When any solid whether it is a dye or any other chemical substance in a solid state subjected to high heat, the framework of the bonds within the dye becomes weakens and starts breaking down. So, it converted into a less uniform state which is called liquid or solution.

Hence, the whole procedure is called melting

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Answer:

An ionic bond is formed when a metallic element and a non-metallic element form a compound. Elements form ionic bond to gain more stability.

During the evaporation process, liquid components separates from the solid components

Evaporation process means the change liquid water to gaseous water called evaporation and during evaporation process the soluble solid can be separated from its liquid component by allowing the liquid component to evaporate either by its own or by heating and also during evaporation the liquid component is lost to the atmosphere  and the solid remains behind

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The number of moles of potassium permanganate in 2.5 grams of the solution is 0.016moles (option A).

The number of moles of a substance is amount of the substance of a system which contains exactly 6.02214076 × 10²³ atoms or molecules.

The number of moles of a substance can be calculated by dividing the mass of the substance by its molar mass as follows:

no of moles = mass ÷ molar mass

According to this question, there are 2.50 grams sample of potassium permanganate. The molar mass of potassium permanganate is 158.034 g/mol.

no of moles = 2.5g ÷ 158.034g/mol

moles = 0.016moles

Therefore, 0.016moles are in 2.5 grams of the solution.

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Considering the definition of molar mass, the correct answer is option a. 0.016 moles of potassium permanganate are in the sample

The molar mass of substance is a property defined as the amount of mass that a substance contains in one mole.

The molar mass of a compound is the sum of the molar mass of the elements that form it multiplied by the number of times they appear in the compound.

In this case, you know the molar mass of the elements is:

So, the molar mass of the compound KMnO₄ is calculated as:

KMnO₄= 39.1 g/mole + 54.94 g/mole + 4× 16 g/mole

Solving:

KMnO₄= 158.04 g/mole

You can apply the following rule of three: If by definition of molar mass 158.04 grams of the compound are contained in 1 mole, 2.50 grams are contained in how many moles?

amount of moles= (2.50 grams× 1 mole)÷ 158.04 grams

mass= 0.016 moles

Finally, there are 0.016 moles.

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The change in enthalpy of the system -1.67 x [tex]10^4[/tex] J

Given the data contains,

The mass of the sample is 348g.

The initial temperature is 127 [tex]^oc[/tex].

The final temperature is  103 [tex]^oc[/tex].

The change in temperature is calculated as,

ΔT = T2 - T1

ΔT = 103 - 127 = -24[tex]^oc[/tex]

The change in temperature is -24[tex]^oc[/tex].

The heat content of the system is calculated as,

q = mc ΔTq = 348 x 2.010 x (-24)

q = -1.67 x [tex]10^4[/tex] J

Temperature, a measure of hotness or coldness, expressed on one of several arbitrary scales, indicating the direction in which thermal energy  spontaneously flows—that is, from a hotter body. Temperature does not correspond to the energy of a thermodynamic system; e.g. a burning match is at a much higher temperature than an iceberg, but the total thermal energy of an iceberg is much greater than the energy contained in a volcano.

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Let's see that in the periodic table, we have the molar mass of every element. In this case, carbon has a molar mass of 12 g/mol and oxygen of 16 g/mol. The conversion from grams to moles is dividing the mass by the sum of the molar mass of the compound.

In this case, we have 1 atom of carbon and two atoms of oxygen. Doing the algebraic sum for each of them with their molar mass we're going to obtain:

So, 225 g of carbon dioxide will be:

So, finally, we have 5.11 moles in 225 grams of CO2.

Answer:

13.5 g of chromium (II) chloride (CrCl2).

Explanation:

What is given?

Molality (m) = 0.294 m.

Mass of solvent = 375 g = 0.375 kg.

Molar mass of chromium (II) chloride (CrCl2) = 122.8 g/mol.

Step-by-step solution:

Let's remember the concept of molality: The molality (m) of a solution is the moles of solute divided by the kilograms of solvent. Its formula is the following:

As we have the molality, and the mass of solvent in kg, we just have to solve for 'moles of solute', which in this case, the solute is CrCl2, and replace the given data, like this:

We have 0.110 moles of CrCl2, but the problem is asking for its mass, so let's convert 0.110 moles to grams using the molar mass of CrCl2:

The answer is that we need to add 13.5 g of chromium (II) chloride (CrCl2).

The volume of the gas at a temperature of 405.0 K would be 607.5 mL. Making option D the right answer to the question.

What is the volume of the gas?

To find the volume of the gas, the equation to be used would have to be combine gas law.

Combine gas law as the name suggest uses the combination of Charles law which measures Volume against temperature, and Gay-Lussac's law which measures Pressure/Temperature, and Boyle's law  which measures pressure X volume where k is constant.

Using the combine law to find the volume, we have:

P₁V₁/T₁=P₂V₂/T₂

Where P₁ = initial pressure

           V₁ = initial volume

             T₁ = initial temperature

            P₂ = final  pressure

            V₂ = final  volume

            T₂ = final  temperature

P₁ = 2.25atm

V₁ = 450.0 mL

T₁ = 300 K

T₂ = 405.0 K

V₂ = ?

D) 607.5 mL

= [2.25(450)]÷300=[2.25(V₂]÷405

Making  V₂ the subject

 3.375=2.25 V₂ ÷ 405

V₂ = 3.375 x 405 ÷ 2.25

V₂ = 607.5 mL

In summary, a gas with an initial pressure of 2.25atm, an initial pressure of 450.0 mL and an initial temperature of 300 K would have a final volume of 607.5 mL if the temperature is increased to  405.0 K.

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(a): This is an elimination reaction. The reaction proceeds in 3 steps; Step 1: Protonation of alcohol, step 2: Loss of leaving group, and step 3: Deprotonation to form an alkene. Elimination (E1) reaction dominates than substitution (SN1) reaction because the formed HSO4- anion is a poor nucleophile and tends not to add to the carbocation intermediate formed. Hence the product formed is I, is trans.

(b) This is a dihydroxylation of the alkenes reaction. A catalytic amount of OsO4 is used along with an oxidizing agent, which oxidizes the reduced osmium(VI) into osmium(VIII) to regenerate the catalyst. The reaction proceeds in 2 steps; Step 1: Cis addition of OsO4 to double bond and form 4 member cyclic osmate ester. Step 2: Hydrolysis of the intermediate to 1.2-diol. Hence the product formed is II, is cis. 

(c) This is hydroboration - oxidation reaction. The reaction proceeds through the addition of H- on the more substituted carbon and BH2 on the less substituted carbon of the double bond. The reaction is a syn addition. Hence the product formed is III.

(d) This a reduction reaction where carboxylic acid (-COOH) is reduced to 1o alcohol (-CH2OH). Hence the formed product is IV.

Stereochemistry, a subdiscipline of chemistry, involves the take a look at the relative spatial association of atoms that form the shape of molecules and their manipulation.

The observation of stereochemistry specializes in stereoisomers, which by means of definition have an equal molecular method and series of bonded atoms (constitution), however, differ within the three-dimensional orientations of their atoms in space. for that reason, it's also referred to as 3-d chemistry three-dimensionality.

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Disclaimer:- your question is incomplete, please see below for the complete question.

Each of the following reactions has been reported in the chemical literature. Predict the product in each case, showing stereochemistry where appropriate.

The enthalpy of vaporization of methane is 8.22KJ and enthalpy of vaporization of ethane is 44.25KJ.

We know, the enthalpy of vaporization is defined as the amount of energy required by one mole of compound to get completely evaporated.

a. So, it is given that 0.579 moles of methane takes 4.76 KJ of energy.

So, 1 mole of methane will take 4.76KJ/0.579 energy.

Hence, the enthalpy of vaporization of methane is 8.22 KJ.

b. The amount of energy required to evaporate 22.45 grams of ethane is 21.2 KJ.

We know already,

Moles = mass of substance given/molar mass of substance.

Molar mass of ethane = 46g/mol.

So,

Moles of ethane = 22.45/46

Hence, the energy required to evaporate one mole of ethane = 21.2 ×46/22.45

Energy required = 44.25 KJ.

Hence, the enthalpy of evaporation of ethane is 44.25KJ.

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Answer:

1. Butter is yellow

2. Melts at 32-35 degrees celsius

3. Butter usually comes in a square shape (I'm not so sure about this)

4. Butter is squishy

Explanation:  Butter remains a firm solid when refrigerated, but softens to a spreadable consistency at room temperature, and melts to a thin liquid consistency at 32 to 35 °C (90 to 95 °F). The density of butter is 911 g/L (151⁄4 oz/US pt). It generally has a pale yellow color, but varies from deep yellow to nearly white.

Option B is correct. Caesium bromide, also known as cesium bromide, is an ionic compound of caesium and bromine with the formula CsBr.

An ionic bond is formed when a positively charged ion bonds with a negatively charged ion, in which one atom donates electrons to the other. An example of an ionic bond is the chemical molecule sodium chloride. Carbon shares four valence electrons with each hydrogen atom, resulting in a covalent bond. Methane is the chemical compound's name. Carbon cannot transfer its four valence electrons to each hydrogen atom, which is why it is not an ionic bond. Electrostatic attraction between positive and negative ions holds ionic solids together.

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Answer:

one of the objects will have higher density

Explanation:

In Beaker A, an antacid tablet is added to 50 mL of 20ºC water. In Beaker B, an antacid tablet is added 50 mL of 70ºC water reaction occur faster in the beaker B

Antacid tablet are the medicine for acid in the stomach to relieve indigestion and heartburn and in the given data in beaker A the antacid tablet is added in 50mL of 20ºC water and then in beaker B an antacid tablet is added 50 mL of 70ºC water then in beaker B the reaction will occur fast because in beaker B the temperature of water is more than beaker A so the antacid tablet will dissolve fastly in more temperature than in less temperature

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The reactants are the one to the left side, so they are Cu and HNO₃.

Their coefficients are 3 and 8, so for each 3 Cu that reacts, we will need 8 HNO₃

The Limiting reactant is the one that we have less considering the proportions they will react.

Let's see the two possible cases.

If we have 1 mol of Cu, we need to divide it by its coefficient and multiply it by the coefficient of HNO₃:

HNO₃ --- Cu

8 --- 3

This means that we need about 2.7 mol of HNO₃ to react all the 1 mol of Cu we have.

Since we have 1 mol of HNO₃, we don't have enough.

If we make the other way around, we will get the following:

1 mol of HNO₃, so we need:

Cu --- HNO₃

3 --- 8

So, we would need 0.375 mol of Cu to react with all 1 mol of HNO₃ we have, and since we have 1 mol of Cu, this is enough.

So, we have two pos

Answer: As ice melts into water, kinetic energy is being added to the particles. This causes them to be 'excited' and they break the bonds that hold them together as a solid, resulting in a change of state: solid -> liquid.

Explanation:

(4) The energy carried by one photon of light is  4.42 x 10⁻¹⁹ J.

(5) The energy possessed by a single photon with frequency 5.23 x 10^20 s-1 is 3.47 x 10⁻¹³ J.

The energy of the photon is calculated as follows;

E = hf

E = hc/λ

where;

E = (6.626 x 10⁻³⁴ x 3 x 10⁸) / (4.5 x 10⁻⁷)

E = 4.42 x 10⁻¹⁹ J

The energy possessed by a single photon with frequency 5.23 x 10^20 s-1 is calculated as follows;

E = hf

E = (6.626 x 10⁻³⁴ x 5.23 x 10²⁰)

E = 3.47 x 10⁻¹³ J

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Answer

a) Ba

b) Si

c) Zn

Explanation

The presence of unpaired electrons in an atom orbitals indicates paramagnetic properties. When no unpaired electron is observed in an atom orbitals, such an atom possesses diamagnetic properties.

Therefore, atoms in their ground states that are expected to be diamagnetic in the options are:

a) Ba

b) Si

c) Zn

Answer:  Phosphatidylcholine is the name of the lipid that forms when complete hydrolysis of glycerophospholipid yields glycerol, two fatty acids and phosphoric acid.

Explanation: The term "glycerophospholipids," also known as "phosphoglycerides," describes a molecule of glycerol that has two fatty acid chains and is esterified with one substituted-phosphoric acid.

Hence, Phosphatidylcholine is the name of this group of glycerophospholipids.

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