Put 10 milliliters of distilled water into a second test tube. Label it test tube 2, and place it in the rack. 2. Record the temperature of the water. 3. Measure 2.00 grams of anhydrous copper(II) sulfate (white powder) into a weighing boat. 4. Pour the anhydrous copper(II) sulfate into test tube 2. 5. Measure the final temperature of the solution in test tube 2. Watch the thermometer for a couple minutes, and record the highest temperature it reaches. 6. Calculate the change in temperature. What is the initial temperature in Celsius? What is the final temperature in Celsius?

Answer:

72264x10²³moles

Explanation:

By Avogadro constant one mole of a substance is equal to 6022x10²³. so 12 hydrogen atoms =

12×6022x10²³=72264x10²³ moles.

Element Z can be classified as a metal and will be found to the left of the zigzag line of the periodic table.

Hence, option 3 is correct answer.

Metals are solid at room temperature. Metals are malleable. Metals loses electrons easily. Metal are less electronegative. Non metals are non malleable. Non metals cannot loses electron. Non metals are more electronegative.

The Zig-Zag line called the amphoteric line, the semimetal line, the metal non metal line, the stair case and the metalloid line on the periodic table separates the metals from the non metals.

Thus from the above conclusion we can say that Element Z can be classified as a metal and will be found to the left of the zigzag line of the periodic table.

Hence, option 3 is correct answer.

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Disclaimer: The question was given incomplete on the portal. Here is the complete question.

Question: Element Z has the following properties:

a. silvery-white solid at room temperature

b. malleable

c. used as a catalyst

d. conducts electricity

Element Z can be classified as a _________ and will be found ________ the zigzag line of the periodic table.

(1) non-metal; along side of

(2) metal; along side of

(3) metal; to the left of

(4) metalloid, along side of

(5) non-metal; to the right of

Option 3 is correct

Element Z can be classified as a metal and will be found to the left of the zigzag line of the periodic table.

As the element Z conducts electricity, so it is a metal.

Metals can be hammered, crushed, or rolled into thin sheets without breaking due to a feature known as malleability.

As the given element Z is malleable, so it is a metal.

Most transition metals are also used as catalyst because they can activate other compounds by adsorbing them to their surface. As the element Z is used as catalyst, so it is metal.

Some other physical properties of metals are :

1) They are also good conductor of heat.

2) Highly ductile

3) They are lustrous

4) They are sonorous

Metals are present on the left side of the zig-zag line (the line that separates metals and non metals) whereas non-metals are present on the right side of this line.

As the Element Z is metal on the basis of the given properties left side of the zig-zag line, so it will be found to the left of the zigzag line of the periodic table.

Hence option (3) is correct

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Answer:

c. because it lacks oxygen which might support life of the bacteria

Answer:

1:loses or gains energy

Answer:

10 million years

Explanation:

For a sample to decay to 25% of its original amount, 2 half lives must have passed. Since one half life is 5 million years, multiplying this by 2 gives us that 2 half lives is 10 million years.

Glucose is a sugar that can be reduced to produce an alcohol (option B). Details about glucose reduction can be found below.

Reduction is a reaction in which electrons are gained and valence is reduced.

Reduction can also mean the removal of oxygen or the addition of hydrogen to a substance.

Glucose is a chemical compound and sugar with the chemical formula of C6H12O6, however, it can undergo reduction reaction to produce alcohol/ethanol (C2H5OH) in a process called fermentation.

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Answer:

2

Explanation:

There are  3 carbons on the right side

there are only two on the left side....you need one more ...so add one more... change the '1' coefficient in front of C   to  '2'

The chemical separation method for two of the above named mixtures or compound indicated above are explained below.

A chemical compound is a material generated by the chemical union of two or more elements in set quantities.

Benzophenone and tributylamine

The combination of benzophenone and tributylamine is in diethyl ether (given in question). Tributylamine is a base that may readily be changed to a water soluble salt by adding an aqueous acid.

Add dilute aqueous acid to the solution. The amine salt will be present in the aqueous layer, whereas benzophenone will be present in the ether layer. A separatory funnel will isolate levels.

Fluorenone, octanoic acid, and dicyclohexylamine

Fluorenone, Octanoic acid, and dicyclohexyl amine: The combination comprises both an acid (octanoic acid) and a base (dicyclohexyl amine) (dicyclohexyl amine).

Add the diluted aqueous base to the solution (like NaCO3). Divide the two layers.

The acid is present in the aqueous layer as a salt, while the fluorenone and amine are present in the ether layer.

Add weak aqueous acid to this combination of fluorenone and dicyclohexyl amine.

Divide the two layers. The amine is present in the aqueous layer, and fluorenone is present in the ether.

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Answer:

Carbonate

Explanation:

Carbonate is a combination of a carbon atom and two oxygen atoms for form a compound.

The rate of change of [tex]SO_2[/tex](g)=0.024M/s when the rate of change of [tex]CS_2(g)[/tex] is – 0.012 M/s.

Reaction rate, in chemistry, is the speed at which a chemical reaction proceeds.

[tex]CS_2(l)+3O_2(g)[/tex] → [tex]CO_2(g)+2SO_2(g)[/tex]

[tex]Rate = \frac{-dcs_2}{dt} =\frac{-do_2}{dt} =\frac{+dco_2}{dt} =\frac{1dso_2}{dt}[/tex]

Rate = \frac{-dcs_2}{dt}  =\frac{-do_2}{dt} =\frac{+dco_2}{dt} =\frac{1dso_2}{dt}

Given:

[tex]\frac{-dcs_2}{dt} =-0.012 M/s[/tex]

[tex]\frac{-dcs_2}{dt} =\frac{dso_2}{dt}[/tex]

[tex]\frac{dso_2}{dt}=0.024M/s[/tex]

The rate of change of [tex]SO_2[/tex](g)=0.024M/s

Hence, the rate of change of [tex]SO_2[/tex](g)=0.024M/s

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There is not enough information to determine anything about the relative abundances of the two isotopes.

Isotopes are atoms that have the same atomic number but different mass numbers. We know that all the isotopes of an element are not available to the same extent in nature.

Hence, from the average atomic mass of carbon, we can see that there is not enough information to determine anything about the relative abundances of the two isotopes.

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Answer: Carbon-12 is more abundant than carbon —13 because the average atomic mass is closer to the mass of carbon —12

Explanation: took the test and got it right

Answer:

3 moles Al2O3

Explanation:

See attached image.

Cooperative binding of oxygen occurs for hemoglobin.

Cooperative binding refers to the process whereby binding of one molecule of oxygen results in more binding of oxygen molecules due to increased affinity of oxygen by the ligand.

Cooperative binding of oxygen occurs in hemoglobin.

In conclusion, cooperative binding enables hemoglobin to carry oxygen efficiently.

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Guanine pairs with cytosine using three noncovalent hydrogen bonds, while adenine pairs with thymidine using two noncovalent hydrogen bonds.

Cytosine and guanine are joined by three hydrogen bonds. The Watson and Crick bases differ from one another in strength as a result. Thymine and adenine bonded base pairs in DNA are weaker than guanine and cytosine bonded base pairs. Size and structure of the specific nucleotides cause Adenine and Thymine to always pair together while Cytosine and Guanine always pair together.

Adenine and thymine can make two hydrogen bonds, while cytosine and guanine can form three hydrogen bonds. Or, to put it more simply, A and G form bonds. Because each base can only link with one other base, the process is known as complementary base pairing.

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A 20.0 g sample of methyl alcohol (CH₃OH, molar mass 32.0 g/mol) was dissolved in 21.6 g of water. The mole fraction of CH₃OH is 0.342.

Number of moles = [tex]\frac{\text{Given Mass}}{\text{Molar Mass}}[/tex]

Number of moles of CH₃OH = [tex]\frac{20\ g}{32\ g/mol}[/tex]

                                               = 0.625 mol

Number of moles of H₂O = [tex]\frac{21.6\ g}{18\ g/mol}}[/tex]

                                          = 1.2 mol

Mole Fraction = [tex]\frac{\text{Moles of solute}}{\text{Moles of solute + Moles of solvent}}[/tex]

                       = [tex]\frac{0.625}{0.625 + 1.2}[/tex]

                       = [tex]\frac{0.625}{1.825}[/tex]

                       = 0.342

Thus from the above conclusion we can say that A 20.0 g sample of methyl alcohol (CH₃OH, molar mass 32.0 g/mol) was dissolved in 21.6 g of water. The mole fraction of CH₃OH is 0.342.

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The relative molecular mass of an element is a proportion of the mass of the unified amu. The relative molecular mass of sodium hydroxide is 40.

The molecular mass of a substance is an addition of the individual masses of the element that makes the compound.  

Moles of NaOH = 8 mole

Molarity = 0.2 M

Moles of sodium hydroxide in 25 cm³: 25 × 0.2 = 0.005 moles

The mole ratio between the two moles:

0.2 ÷ 0.005 = 40

Therefore, 40 is the relative molecular mass of the acid.

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Which holds true for nuclear fission? Check all that apply.

Which holds true for nuclear fusion? Check all that apply.

What is nuclear fission?

An unstable nucleus splitting into two smaller, more stable nuclei is known as nuclear fission. Large amounts of energy are released during this process since a smaller nucleus's structure requires a lot less energy to maintain. This mechanism is exploited by turning the thermal energy released into electrical energy.

What is nuclear fusion?

The alternative is nuclear fusion. It entails joining two smaller, less stable nuclei into one larger, more stable nucleus. The sun is where this process takes place because it needs so much energy. Moreover, a tremendous amount of energy is released. Helium, a two-proton element, is the smallest element that can be created using this procedure. The smallest element has one proton (H).

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Answer:

A B D E

Explanation:

Edge 2023

River samples may evidence problems with the water treatment plant because it may contain an excessive amount of certain substances which are filtered during this procedure.

A water treatment plant is a place where wastewater from a city is processed and purified in order to obtain potable water.

Water treatment procedure generally involves the collection, chemical substance addition, filtration, and disinfection.

Any type of problem in these steps can be evidenced by taking a sample of the water after treatment.

In conclusion, river samples evidence problems due to an excessive amount of certain substances which are filtered during this procedure.

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The pressure she exerts on the carpet sample:-5.8279 MPa

P = F/A

Where,

F= Force

A = Area

Given that;

d= 0.987 cm =0.987  x 10^-2 m

m= 45.5 kg

Area = πr^2= (π(0.987  x 10^-2)^2/2)

       =7.6511 x 10^-5  square meter

Force= mg

        = 45.5 x 9.8

        =445.9 N

Pressure = force/ area

              =445.9/7.6511 x 10^-5

              =5.8279 MPa

The pressure she exerts on the carpet sample:-5.8279 MPa

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55.2218 grams of magnesium chloride must be added to 725 mL of water to create a solution with an anion concentration equal to 0.800 M.

To calculate the number of moles from molarity as

[tex]\frac{\text{x moles}\ MgCl_2}{0.725\ \text{L solution}} = \frac{0.8\ \text{moles}\ MgCl_2}{1.0\ \text{L solution}}[/tex]

x moles MgCl₂ = [tex]\frac{0.8\ \text{moles}\ MgCl_2}{1.0\ \text{L solution}} \times 0.725\ \text{L solution}[/tex]

                         = 0.58 moles MgCl₂

Mass of one mole of substance is known as molar mass.

Molar mass of MgCl₂ = Atomic mass of Mg + 2 (Atomic mass of Cl)

                                   = 24.31 + 2 (35.5)

                                   = 95.21

Convert moles to grams

0.58 moles MgCl₂ × [tex]\frac{95.21\ g}{1\ \text{mole}\ MgCl_2}[/tex]

= 55.2218 grams

Thus from the above conclusion we can say that 55.2218 grams of magnesium chloride must be added to 725 mL of water to create a solution with an anion concentration equal to 0.800 M.

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An inert gas is used as an electrical insulator.

Sulfur hexafluoride (SF 6)) is a very potent and long-lasting greenhouse gas that is primarily used as an electrical insulator and arc suppressor. It is non-flammable, non-toxic, inorganic, colorless, and odorless.

The sulfur atom's steric hindrance plays a significant role in the inertness of SF6, whereas SeF 6 and other heavieSFroup 16 equivalents are more reactive than SF 6 due to less steric hindrance.

However, it reacts exothermically with lithium and does not interact with molten sodium below its boiling point.

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Answer:

C.) n

Explanation:

-----> P = pressure (atm)

-----> V = volume (L)

-----> T = temperature (K)

-----> n = number of moles

According to the problem, it seems like pressure (P), volume (V), and temperature (T) are all changing. The problem never brings up whether the number of moles (n) has changed. Therefore, the number of moles (n) must have been held constant.

________________________________________________________

If you need to know what the temperature changes to....

When the number of moles is held constant, you can find the change in the other variables using the Combined Gas Law equation:

P₁V₁ / T₁ = P₂V₂ / T₂

In this formula, "P₁", "V₁", and "T₁" represent the initial pressure, volume, and temperature. "P₂", "V₂", and "T₂" represent the final pressure, volume, and temperature. You can find the final temperature by plugging in the given values and simplifying.

P₁ = 1.21 atm                      P₂ = 2.52 atm

V₁ = 3.75 L                        V₂ = 1.72 L

T₁ = 293 K                         T₂ = ? K

P₁V₁ / T₁ = P₂V₂ / T₂                                       <----- Equation

(1.21 atm)(3.75 L) / (293 K) = (2.52 atm)(1.72 L) / T₂         <----- Insert values

0.015486 =  (2.52 atm)(1.72 L) / T₂              <----- Simplify left side

0.015486 = 4.3344 / T₂                               <----- Multiply 2.52 and 1.72

0.015486 x T₂ = 4.3344                               <----- Multiply both sides by T₂

T₂ = 279.885                                                <----- Divide both sides by 0.015486

T₂ = 280 K                                                   <----- Answer in correct sig figs

Answer:

- 0.57138096 M

- 0.571mol

- 0.571 M NaHCO3

- 0.571 mol/NaHCO3

(these are just different ways to identify the units but they all work and mean the same thing)

Explanation:

- molarity is measured by the ratio of the moles of a solute per liters of a solution

- the formula for molarity is: [tex]M = \frac{mol (s) solute}{L solution}[/tex]__________________________________________________________

- first, you need to convert 250mL to L so, [tex]250/1000=0.25[/tex]

- when it comes to converting g to mol you can do it in a separate equation but i prefer to do it all in one equation

__________________________________________________________

- so the equation for this specific problem would be set up like this:[tex]\frac{12.0g}{.25L} x \frac{1mol}{84.007 g} = x[/tex]

__________________________________________________________

- now to actually solve it:

[tex]\frac{12.0g}{.25L} x \frac{1mol}{84.007 g} = \frac{12.0}{21.00175} = 0.57138096(or)/0.571mol/0.571 M NaHCO3/(0.571 mol/NaHCO3)[/tex]

hope this helps :)

Answer:

Aluminum plays a vital role in the construction of aircraft. Its high resistance to corrosion and good weight to strength to cost ratio makes it the perfect material for aircraft construction. But the one property that makes aluminum the ideal metal for aircraft construction is its resistance to UV damage.

Explanation:

it's quite long but hope it helps

The height of water column would be stable on Mars is 1.89 m

To answer the question, we need to know what the pressure on mars is

The pressure on mars P = ρgh where

Making h subject of the formula, we have

h = P/ρg

Since

Substituting the values of the variables into the equation, we have

h = P/ρg

h = 700 Pa/(1000 kg/m³ × 3.7 m/s²)

h = 700 Pa/370 kg/m²s²

h = 1.89 m

So, the height of water column would be stable on Mars is 1.89 m

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The main chemical compound in marijuana that has a harmful effect on cells lining the airways is tetrahydrocannabinol, or THC. This compound is similar to nicotine, which is the primary harmful chemical compound in cigarette smoke.

In addition to THC, marijuana smoke also contains more tar than cigarette smoke. Tar is made up of small particles that are easily inhaled and are known to be carcinogenic. The combination of the THC, nicotine, and tar in marijuana smoke is what makes it so damaging to cells lining the airways.

The daily smoking of one marijuana joint is equivalent to the amount of damage to cells lining the airways as around five cigarettes.

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Property of water:

Due to the water's ability to stick together (Cohesion), droplets form instead of being spread evenly.  

The strong cohesion between water molecules:  

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The answer is that they were were not based on evidence and experiment and that made alchemy unscientific in its practices.

Alchemy is an old practice that might be thought of as a forerunner of chemistry.

The term alchemy is derived from the Arabic al-kimiyya, which is derived from Greek. Alchemy's fundamental notions focus around the transformation of one substance into another, often transforming a basic metal like lead or iron into a "noble" metal like silver or gold

The alchemist's main ambitions were to find the Stone of Knowledge, the medium of Eternal Youth and Health, and metal transmutation.

To conclude with we can say Alchemy is based on magic and occultism rather than true investigation and facts. Many of the items in it have been utilised as fundamentals for certain chemistry, although the vast majority of them are wrong and inaccurate.

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The molecule expand to relieve steric strain before undergoing torsion to a non-planar structure in order to have several resonating structures.

It should be noted that a molecule simply mean the group of atoms that are bonded together that represents the smallest fundamental unit if the chemical compound.

It should be noted that structures containing fused benzene rings have extensive conjugation. Due to this, they can undergo resonance.

This is vital in decreasing the overall energy of the molecule and helps increase its stability. When there's a change in torsion angle to relieve the steric strain, the molecule won't be planar, hence, the energy will increase and the stability will reduce.

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The volume of aluminum hydroxide required for neutralization is 24.30 mL.

Acid and base:

The compounds which gives H+ ions in the aqueous solution are called acids while those which gives OH- ions are called base.

Neutralization reaction:

It is a chemical reaction that involves a reaction between the equal molar amount of acid and base and form a solution that has pH = 7.

Calculations:

The reaction between aluminum hydroxide and nitric acid is expressed as:

Al(OH)2 + 2HNO3 ----> Al(NO3)2 + 2H2O

The number of moles of nitric acid is calculated as:

Moles of HNO3 = 0.175 M x (30.00/1000) L = 0.00525 mol

The number of moles of Al(OH)2 required for the neutralization is:

Moles of Al(OH)2 = 0.00525 mol/2 = 0.002625 mol

The volume of Al(OH)2 is calculated as:

Volume = 0.002625 mol/0.108 M = 0.0243 L = 24.30 mL

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