Please help would really appreciate it! Thank you so much! ❤️ Have a wonderful day!

Answer:

B. False

Explanation:

In chemistry, pH  is a scale used to specify how acidic or basic a water-based solution is. Acidic solutions have a lower pH, while basic solutions have a higher pH. ... The pH value can be less than 0 for very strong acids, or greater than 14 for very strong bases.

Final answer:

Acids have a high PH - b. False

Explanation:

The statement that acids have a high pH is FALSE. In chemistry, the pH scale is used to measure how acidic or basic which also refers to how alkaline a substance is. The pH scale ranges from 0 to 14, with 7 being neutral, numbers below 7 indicating acidity, and numbers above 7 indicating alkalinity.

Generally, acids have a higher concentration of hydronium ions, resulting in a lower pH, typically below 7. Common examples of acids include vinegar and stomach acid, both known for their low pH levels and acidic properties.

Answer:

289,406.25 ≈ 289,406

Explanation:

We can solve this question in 2 ways: Simple calculation and Using the formula.

Simple Calculation: The rate of increase is 5% per hour. And the initial count was 250,000. Therefore, in the first hour, the increase in the count would be 5% of 250,00, which is [tex]\frac{5}{100}[/tex]×250,000 = 12,500. Therefore,  at the end of the first hour, the count would be 250,000 + 12500 = 262,500. Now, for the 2nd hour, the intial count is 262,500 and the increase in count at the end of the 2nd hour would be 5% of 262,500 = [tex]\frac{5}{100}[/tex]×262,500 = 13,125. And the count at the end of the 2nd hour is 262,500+13,125 = 275,625. Similarly for the 3rd hour, the starting count is 275,625 and the increase in count at the end of the 3rd hour is [tex]\frac{5}{100}[/tex]×275,625 = 13,781.25. Thus, the total count at the end of 3rd hour is 275,625+13,781.25 = 289,406.25 ≈ 289,406.

Direct Formula (Actually, it is the compound interest formula): [tex]C(f) = C(i)(1 + \frac{r}{n})^{nT}[/tex] , where C(f) is final count, C(i) is the initial count, r is the rate of increase, n is the number of times rate of increase is applied in a time period, T is the number of time periods. Here, C(i) = 250,000, r is 5% = 0.05, n is one (because 5% increase happens once in one hour) and T is 3 hours.  Therefore, [tex]C(f) = 250000(1 + \frac{0.05}{1})^{3} = 250000(1.05)^{3} = 289406.25[/tex].

Answer:

The atomic mass of Potassium is 39.09 u+-0.0001u and molar mass is  39.09 g,s/mole

Explanation:

Potassium is a metal belongs to group 1 and period 4 whose atomic number is 19 and electron configuration is 2,8,8,1.

The molar mass of Potassium or K is 39.09 g,s/mole and the atomic mass is 39.09 u+-0.0001u. Potassium was first discovered by Humphrey Davey and was first found in the ashes of plants. It also occurs in the mineral sylvite or KCL and is mined as such.

Answer:

Atomic Mass: 39.0983 u.

Molar mass: 39.0983 g/mol

Answer:

The amount of heat absorbed is 5.183889 kJ  .

Explanation:

In conversion of water to ice it rejects some heat while in conversion of ice to water it absorbs heat which is called latent heat which is given as 6.02 kJ/mol.

The amount of ice given is 15.5 g.

Converting it to moles as the latent heat is given in per moles:

[tex]\frac{given\\weight \\ (in\\grams)}{molecular\\weight\\(in\\grams)}[/tex]

Molecular mass of Hydrogen (H) and Oxygen (O) is 1 u and 16 u respectively.

Molecular mass of water is 18 g ( [tex]H_{2} O[/tex] ⇒  2*1+16=18 ).

mole = 15.5/18 ≈ 0.8611 moles

Therefore the amount of heat absorbed by 15.5 g of ice ( 0.8611 moles) = Latent heat * moles

Heat absorbed = 6.02*0.8611

             = 6.02*(15.5/18)

             ≈  5.183889 kJ

Answer:

87.08 W

Explanation:

Power expended by the boy is power needed/ power experienced to/by the wagon throughout this process of pulling.

When the force F is constant and the angle between the force and the displacement s is θ, then the work done is given by W = Fs cos θ.

Assuming that the force and displacement of the wagon are in the same direction cos(θ)= cos(0)= 1

So, W= 38 * 550 (SI units)

W=20,900 J

[tex]Power = \frac{Work done}{Time taken}[/tex]

Power = [tex]\frac{20,900}{240}[/tex]

87.08 W

Answer:

The whole answer is 87.08 but rounding to 2 number its 87

Explanation:

Answer:

C. Gamma rays

Explanation:

Answer:

C. Gamma rays

Explanation:

ap3x

Answer:

V₂ = 30 L

Explanation:

Given data:

Initial pressure = 30 psi (30 /14.696 = 2 atm)

Initial volume = 15 L

Final volume = ?

Final pressure = 1 atm

Solution;

P₁V₁ = P₂V₂

V₂ = P₁V₁  / P₂

V₂ = 2 atm .  15 L /  1 atm

V₂ = 30 L

Answer:

O atom requires 2 electrons to achieve octet structure and in this structure, it is only bonded to one H atom hence only obtaining an additional valence electron. Without a octet structure, the molecule is unstable hence this structure is incorrect. The correct structure should be H-O-H.

Explanation:

Answer:

A Balanced Atom

Most nuclei also contain neutrons. Perhaps the most essential characteristic of a proton is its positive electrical charge. This charge is equal in magnitude to the negative electrical charge of the electron, which means that the charge of one proton balances out the charge of one electron.

Explanation:

Hello. This question is incomplete. The full question is:

"Which chemical equation represents a redox reaction? A. Mg(ClO3)2 + 2HCl → MgCl2 + 2HClO3   B. CO + H2O → H2 + CO2 C. 2NH4NO3 + CuCl2 → 2NH4Cl + Cu(NO3)2 D. Na2SO3 + FeBr2 → 2NaBr + FeSO3 "

Answer:

B. CO + H2O → H2 + CO2

Explanation:

The reactions that involve loss and gain of electrons are called oxide-reduction reactions. In the oxidation reaction, electrons are lost, while the reduction reaction consists of gaining electrons.

Oxidation can occur in three circumstances: when oxygen is added to the substance, when a substance loses hydrogen or when the substance loses electrons. Example: fruit salads tend to darken when they come into contact with air, this is because oxygen acts to promote fruit oxidation. A tip to avoid this is to add lemon or orange juice, as the vitamin C present in citrus fruits prevents the oxidizing action of oxygen on the salad.

Reduction, in turn, is the reverse and also occurs in three ways: when a substance loses oxygen, when it gains hydrogen or when it gains electrons. Example: when the copper oxide (black) is placed in an appropriate apparatus (chamber) for its reduction to occur, the hydrogen gas comes in contact with the super heated copper oxide and, as a result, it loses oxygen and gradually goes away. turning pink as it is being reduced to copper.

An example of a redox reaction is CO + H2O → H2 + CO2

A redox reaction is a reaction that involves the transfer of electrons. An example is the reaction between hydrogen and fluorine, where hydrogen is oxidized and fluorine is reduced.

A redox reaction, or reduction-oxidation reaction, involves a transfer of electrons between two species. An example of a redox reaction is the reaction between hydrogen and fluorine:

H2 + F2 → 2HF

In this reaction, hydrogen is oxidized (loses electrons) and fluorine is reduced (gains electrons). Hence this is a redox reaction. You can often identify redox reactions by looking for changes in oxidation states of elements in a reaction.

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Explanation:

Using a ruler is not ideal for measuring the volume of irregular objects like a random stone. This is because they do not have definite length, width and height dimensions like regular objects eg a block of wood. Measuring the volume of the displaced water (eg using a calibrated cylinder) will give you the volume of the object. Remember an object displaces its own volume of a liquid when fully immersed in the liquid - Archimedes' principle.

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Answer:

away from; away from

Explanation:

A divergent boundary occurs when two tectonic plates move away from each other. Here two plates are moving away from each other along this boundary. The result of this motion is that North America is moving away from Europe.

The Mid-Atlantic Ridge is defined as the mid-ocean ridge which is located at the bottom of the Atlantic ocean which stretches approximately 16,000 kilometers from north to south. Mid ocean ridges are large central rift valleys which is surrounded by the mountain ranges created by tectonic forces along divergent plate boundary lines.

The divergent plate boundaries exist between the plates which are spreading apart from each other. This occurs due to the convection currents in the mantle rising and impacting beneath the lithosphere before spreading out and dragging plates along with them.

The mid Atlantic range ridge separates the Eurasian, north American and african plates.

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0.111 J/g°C

We are given;

But, density of pure water = 1 g/mL

We are required to determine the specific heat of the metal;

Q = m × c × ΔT

For water, ΔT = 23.68 °C - 21° C

                       = 2.68 °C

Thus;

Q = 45.2 g × 4.184 J/g°C × 2.68°C

    = 506.833 Joules

We know that, Q =  m × c × ΔT

For the unknown metal, ΔT = 101° C - 23.68 °C

                                              = 77.32°C

Assuming the specific heat capacity of the unknown metal is c

Then;

Q = 58.932 g × c × 77.32°C

   = 4556.62c Joules

4556.62c Joules = 506.833 Joules

c = 506.833 ÷4556.62

  = 0.111 J/g°C

Thus, the specific heat capacity of the unknown metal is 0.111 J/g°C

Answer:

C.  nonmetal.

Explanation:

It is not ionic because it did not conduct electricity.

There is only one liquid metal  at room temperature and that is mercury, which will conduct electricity.

A salt is usually solid at room temperature and if it is in solution will conduct electricity.

In the neutralization reaction between nitric acid and sodium hydroxide, 63g of Nitric acid and 60g of Sodium hydroxide would result in 18g of water. The reaction will be limited by the nitric acid acting as the limiting reagent.

The question pertains to a neutralization reaction between nitric acid (HNO3) and sodium hydroxide (NaOH). This reaction produces sodium nitrate (NaNO3) and water (H2O) as per the equation: HNO3 + NaOH → NaNO3 + H2O. To find out the amount of water formed, we need to look at stochiometry of the reaction. From the balanced chemical equation, you can see that 1 mole of nitric acid reacts with 1 mole of sodium hydroxide to produce 1 mole of water.

First, we need to convert the weights of the reactants into moles. The molecular weight of HNO3 is approximately 63 g/mol, so 63 g of nitric acid represents 1 mole. The molecular weight of NaOH is approximately 40 g/mol, so 60 g represents 1.5 moles. Therefore, the limiting reagent in this reaction is nitric acid.

As per the stoichiometry of the reaction, 1 mole of nitric acid will produce 1 mole of water. Thus, 1 mole of nitric acid will give 18 g of water (molecular weight of water is approximately 18 g). So, when 63 g (1 mole) of nitric acid is fully reacted, it will produce 18 g of water.

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Answer:

3,3-dimethylhexane

why did you set the limit to 20 characters?

Answer:

a. chromium (III) chloride

Explanation:

Chromium chloride is also binary ionic compound composed of only two element chromium and chlorine.

When naming these compounds the name of metal or cation is written first and anion is written after the cation. The anions are non meals.

The anion name is end with suffix " ide".

such as chromium chloride.

The (III) shows the oxidation number of metal. In given compound the oxidation state of chromium is +3 while chlorine chow the oxidation state of -1 that's why three chlorine atoms are attached with one chromium atom.

Answer:

% (COOK)2H2O = 37.826 %

Explanation:

mix: (COOK)2H2O + Ca(OH)2 → CaC2O4 + H2O

∴ mass mix = 4.00 g

∴ mass (CaC2O4)H2O = 1.20 g

∴ Mw (COOK)2H2O = 184.24 g/mol

∴ Mw (CaC2O4)H2O = 146.12 g/mol

∴ r = mol (COOK)2H2O / mol (CaC2O4)H2O = 1

⇒ mass (COOK)2H2O = (1.20 g (CaC2O4)H2O)×(mol (CaC2O4)H2O / 146.12 g (CaC2O4)H2O)×(mol (COOK)2H2O/mol (CaC2O4)H2O)×(184.24 g (COOK)2H2O/mol (COOK)2H2O)

⇒ mass (COOK)2H2O = 1.513 g

⇒ % (COOK)2H2O = ( 1.513 g / 4 g )×100

⇒ % (COOK)2H2O = 37.826 %

Final answer:

The percentage of the 4.00 g mixture that is potassium oxalate is 37.75%.

Explanation:

When attempting to determine what percentage of a 4.00 g mixture is potassium oxalate, we begin by using the information provided about the mass of calcium oxalate hydrate recovered.

Given:

Mass of calcium oxalate hydrate recovered = 1.20 g

Molar mass of calcium oxalate hydrate = 146.12 g/mol

Mole:mole ratio of potassium oxalate to calcium oxalate = 1:1

We can calculate the number of moles of calcium oxalate hydrate:

\( \text{Moles of calcium oxalate} = \frac{1.20\,g}{146.12\,g/mol} = 0.00821\,mol \)

Since the ratio of potassium oxalate to calcium oxalate is 1:1, moles of potassium oxalate will be the same, 0.00821 mol.

Now we calculate the mass of the potassium oxalate hydrate:

\( \text{Mass of potassium oxalate} = 0.00821\,mol \times 184.24\,g/mol = 1.51\,g \)

To find the percentage of the mixture that is potassium oxalate:

\( \text{Percentage of potassium oxalate} = \frac{1.51\,g}{4.00\,g} \times 100\% = 37.75\% \)

Therefore, 37.75% of the 4g mixture is potassium oxalate.

Answer:

KOH

Explanation:

Chemical reaction:

2K + 2H₂O →  2KOH + H₂

Element ratio of K.

K = 1

Because only potassium is present.

Element ratio of H₂O.

2 : 1

in water ratio of element is 2 : 1 because two hydrogen and one oxygen atom present.

Element ratio of KOH

1 : 1 : 1

in KOH elemental ratio is 1 : 1 : 1 because one potassium one hydrogen and one oxygen atom are present.

Element ratio of H₂.

2

Just two atoms of hydrogen are present.

Answer:

ΔH₍reaction₎ = ΔH₍ hydrogen gas bond-breakage₎ + ΔH₍fluorine gas bond-breakage₎ + 2.ΔH₍hydrogen fluoride bond-formation₎ .

Explanation:

Reaction:

H₂ + F₂ --> 2.HF      ΔH₍reaction₎

In this reaction, bonds are broken in the hydrogen gas and fluorine gas molecules which then lead to the new bond formation, that is, bond between hydrogen and fluorine atoms which explains the formation of hydrogen fluoride.

ΔH₍reaction₎ = ΔH₍bond-breakage₎ + ΔH₍bond-formation₎

ΔH₍bond-breakage₎ is just ΔH₍ hydrogen gas bond-breakage₎ + ΔH₍fluorine gas bond-breakage₎.

ΔH₍bond-formation₎ is 2.ΔH₍hydrogen fluoride bond-formation₎ .Since the ΔH₍bond-formation₎ is in the units kJ/mol, a factor of 2 comes in the picture

Therefore,

ΔH₍reaction₎ = ΔH₍ hydrogen gas bond-breakage₎ + ΔH₍fluorine gas bond-breakage₎ + 2.ΔH₍hydrogen fluoride bond-formation₎ .

Note: Care should be taken while assigning opposite signs to ΔH₍bond-breakage₎ and ΔH₍bond-formation₎.

Answer:

titan

Explanation:

Answer:

There are two subshells for n=2.

Explanation:

Principal quantum number (n)

It tell about the energy levels. It is designated by n.

For example,

If n =2  

It means there are two energy level present.

Azimuthal quantum number (l)

The azimuthal quantum number describe the shape of orbitals. Its value for s, p, d, f... are 0, 1, 2, 3.

(n-1)

2-1 = 1

thus possible values of l = 0,1

it means principle quantum is 2 and subshells are s and p..

Answer:

-2

Explanation:

Consider object is starting 12 units right from the reference point which is 0.

Assign the right direction positive sign.

when object is moving 14 units on left direction the position of object will be two units to the left side of reference point.

Assign the left direction negative sign position will be -2.

Answer:

Area near a sea having flat land and low relief.

Explanation:

Just think of a beach, that's a coastal plain, it's usually flat land with low relief.

Final answer:

A coastal plain best describes an area near a sea having flat land with low relief, like the Gulf-Atlantic Coastal Plain, which has gradual slopes and can include estuaries like Chesapeake Bay.

Explanation:

The term coastal plain describes an area near a sea having flat land and low relief. It is characterized by a landscape that slopes very gradually toward the sea, with a rate of elevation change so subtle that it could be just a few feet or even inches per mile. An example of a coastal plain is the Gulf-Atlantic Coastal Plain, which extends across various eastern states in the US and includes notable features such as the entire state of Florida, as well as other areas along the Gulf of Mexico and the Atlantic Ocean. Coastal plains can often be swampy due to their flat nature which doesn't allow water to drain away quickly. They are also where coastal plain estuaries, or drowned river valleys, can be found, such as Chesapeake Bay and Delaware Bay.

Answer:

102.807 kPa

Explanation:

There are some assumptions to be made in the answer. The air inside the balloon acts as an ideal gas at a given temperature conditions.

Using the combined ideal gas equation.

[tex]PV = nRT\\[/tex]

P= absolute pressure of air inside the balloon.

V= volume of air inside the balloon (6.23 L= 6.23 * 10⁻³ m³)

n= moles of gas(air). (0.250 mol)

R= Universal gas constant ( 8.314 J / mol·K)

T= Temperature in Kelvin

T= 35 + 273.15 = 308.15 K

So, [tex]P = \frac{nRT}{V}[/tex]

[tex]P = \frac{0.250 * 8.314 * 308.15}{6.23 * 10^{-3} }[/tex]

P= 102.807 * 10³ Pa

P= 102.807 kPa

Answer: 103 for Edmentum users !

Answer:hydrocarbon

Explanation:it reacts with oxygen to produce water and carbodioxide.

Answer:

hydrocarbon

Explanation:

a p e x :)

is a carbon oxoacid and a chalcocarbonic acid. It has a role as a mouse metabolite. It is a conjugate acid of a hydrogencarbonate. Bicarbonate, or hydrogen carbonate, is a simple single carbon molecule that plays surprisingly important roles in diverse biological processes.

Answer:

Dissolves limestone and other rocks.

Explanation:

you didnt give any choices so i did the best i could

Answer:

Nuclear fusion

Explanation:

Nuclear fusion is the source of Sun's energy.. At the core where temperature and pressure are very high hydrogen atoms fuse into helium atom and release energy in the form of Gama rays.