Iron has a density of 7.86 g/cm3 . Calculate the volume (in dL ) of a piece of iron having a mass of 4.89 kg . Note that the density is provided in different units of volume and mass than the desired units of volume ( dL ) and the given units of mass ( kg ). You will need to express the density in kg/dL ( 1 cm3 = 1 mL ) before calculating the volume for the piece of iron.

The alternative that does not include a buffer with a pH equal to the pKa value is 1.0M of a weak acid and 0.1M of HCl. A substantial quantity of a strong acid (HCl) will compromise the buffer system, causing the pH to diverge from the pKa value. Option C is correct.

According to the Henderson-Hasselbalch equation, the pH of a buffer solution can be calculated using the following equation:

pH = pKa + log ([A-]/[HA])

where pH is the desired pH of the buffer, pKa is the acid dissociation constant of the weak acid (or the base dissociation constant of the weak base), [A-] is the concentration of the conjugate base, and [HA] is the concentration of the weak acid (or the conjugate acid in the case of a weak base).

The pH of the buffer can be equal to the pKa value when the concentrations of the weak acid and its conjugate base are equal. The presence of a strong acid like HCl will disrupt the equilibrium and compromise the buffer capacity, causing the pH to deviate from the pKa value. When the weak acid and its conjugate base are present in equal concentrations, the buffer can maintain its pH close to the pKa value.

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Answer:

The principle that allows the enthalpy of a reaction to be determined indirectly from several steps is called Hess's Law.

Explanation:

Hess's Law states that the enthalpy change of a chemical reaction is independent of the pathway between the initial and final states, as long as the initial and final conditions are the same.

This means that the overall enthalpy change for a reaction can be calculated by adding or subtracting the enthalpy changes for a series of simpler reactions that add up to the overall reaction.

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Answer:

stability and completely filled orbitals

Explanation:

As it pertains to valence electrons, "8 is great" means the valence electrons present in the orbital confers stability on the atom as the shell becomes completely filled.

Answer:

Pppppppp pppppppp pppppppp pppppppp

Answer:

Explanation:

Distilled water has a pH of 7. Anything below that is acidic. One is very acidic. So a b and c cannot be the answer.

Lime is a base. That means that when it is put in water, the pH is going to be greater than 7,

The only possible answer is D

Answer:

Explanation:

Arsenic is the the metalloid which has "five valence electrons" in the "fourth electron shell". Explanation: Metalloids are found between the metals and non-metals in the periodic table.

hope it helps

Answer:  The definition of a copmpound is that it have two or more lements.+

Explanation:  The definition of compound is:  "a substance formed from two or more elements chemically united in fixed proportions."  CaO has two elements in a fixed ratio of 1:1.  O2 is a compound since it has 2 elements.  

All of the following are qualitative tests that are often used to identify unknown ionic compounds except titration.

Qualitative tests are conducted to determine the presence or absence of certain ions or compounds in a sample based on their characteristic reactions. Common qualitative tests include flame tests, precipitation reactions, color changes, and gas evolution tests.

Titration, on the other hand, is a quantitative technique used to determine the concentration of a specific substance in a solution by reacting it with a standardized solution of another substance. It is not typically used as a qualitative test for identifying unknown ionic compounds.

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Answer:

One molecule of water has two hydrogen atoms covalently bonded to a single oxygen atom. Water is a tasteless, odorless liquid at ambient temperature and pressure.

Explanation:

Hope this helps :) Have a great day!

Because boiling point is independent of liquid volume, the boiling point would not vary.

What is boiling point  ?

A liquid's boiling point changes depending on the pressure being applied; the normal boiling point is the temperature at which the vapor pressure is equal to the average atmospheric pressure at sea level (760 mm [29.92 inches] of mercury). Water boils at sea level at 100° C.

The temperature at which a liquid's vapor pressure equals the pressure around it and the liquid turns into a vapor is known as the boiling point of a substance

A liquid's boiling point varies depending on the atmospheric pressure in the area. The boiling point of a liquid is lower in a partial vacuum than it is at atmospheric pressure. A liquid's boiling point is lower under low pressure than it is under air pressure. As a result, water boils at 99.97 °C (211.95 °F) at sea level but at 93.4 °C (200.1 °F) at 1,905 m (6,250 ft) altitude under standard pressure. Various liquids will boil at different temperatures at a given pressure.

Because boiling point is independent of liquid volume, the boiling point would not vary.

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A super acid is defined as an acid with acidity greater than 100% pure H2SO4. It can also be defined as a medium in which the chemical potential of the proton is higher than in pure Sulphuric Acid.

In the chemical reaction shown, 2H2 + O2→H2O, hydrogen and oxygen are called reactants.

A chemical reaction equation is has a left and a right hand side separated by an arrow.

The species on the left hand side "combine" to yield the specie(s) on the right hand side.

These species on the left hand side undergo breaking of bonds are rearrangement of atoms to give the species on the right hand side.

Hence, the species on the left hand side are called reactants because they combine with each other to give the species on the right hand side (products).

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Answer:

1.37cm

Explanation:

It's less than 1.4cm but more than 1.3cm. It's also more than 1.35cm so I guess the best answer would be 1.37cm or round up to 1.4cm

Answer:

Explanation:

The methyl orange indicator is typically yellow in an acidic solution with a pH below 4. If the solution is a hydrochloric acid, the indicator will likely turn red, as hydrochloric acid has a pH of around 1. If the solution has a pH between 4 and 6, the methyl orange indicator will appear orange.

Answer:

Condensation

Explanation:

Gas particles move closer to each other and condense which makes them heavier, The density will increase then it becomes a liquid

Answer:

If you follow the periodic table and its orbitals, you'll see that the element that has the electron configuration of 1s²2s²2p³ is Nitrogen. It's period, group, and atomic number are 2, 15, and 7 respectively. The other 2 are Neon, who's period, group, and atomic number are 2, 18, and 10 and the last one is Fluorine, who's period, group, and atomic number are 2, 17, and 9.

Since rate of reaction depends on the surface area of the reactants,  lumps of sodium carbonate react more slowly with dilute nitric acid than powdered sodium carbonate.

The rate of reaction is affected by many factors among which is the surface area of the reactants. We must note that the greater the surface area the quicker the rate of reaction.

As such, the surface area of the powdered sodium carbonate is greater than that of the lumps of sodium carbonate. Therefore, lumps of sodium carbonate react more slowly with dilute nitric acid than powdered sodium carbonate. This is because the particles of the powdered sodium carbonate collide more easily with the acid molecules than the lumps of sodium carbonate.

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Answer:

Because of daylight savings

Answer:

because during the summer is when the earth is tilted a certain one. But because in different places they get summer at a different time the earth tilts differently for the places around the world.

Explanation:

Answer:

15.9 Liters

Explanation:

according to Boyle's law P1V1 = P2V2

so we just plug in the values the problem gives us and solve for V2

(1.74)(4.21)=(.46)(V2)

V2 = 15.9 Liters

*note - there is a typo in your question when you states P1 = 1 074 atm. I just assumed you meant 1.74, if this is a mistake just replace 1.74 with the real P1 and solve it as shown above

if you have any questions just comment them below

Answer:

The volume in cubic centimeters is 250

Explanation:

The rule of three or is a way of solving problems of proportionality between three known values and an unknown value, establishing a relationship of proportionality between all of them.

If the relationship between the magnitudes is direct, that is, when one magnitude increases, so does the other (or when one magnitude decreases, so does the other), the direct rule of three must be applied. To solve a direct rule of three, the following formula must be followed:

a ⇒ b

c ⇒ x

So:

\(x=\frac{c*b}{a}\)

The direct rule of three is the rule applied in this case where there is a change of units. To perform this conversion of units, you must first know that 1 mL = 1 cubic centimeters. So, if 1 cubic centimeters is 1 mL, how many cubic centimeters equals 250 mL?

\(cubic centimeters=\frac{250 mL*1 cubic centimeters }{1 mL}\)

cubic centimeters= 250

The volume in cubic centimeters is 250

Answer:

Gap 1, S-Phase, Gap 2, Prophase, Metaphase, Anaphase, Telophase, Cytokinesis

Hope this helps.

Answer: I hope this helps :

An element in Group 5 = Bismuth (Bi)

A halogen = Fluorine (F) or Astatine (At)

An alkali Metal = Lithium (L)

A metal in Group 6 = Selenium (Se) , Tellurium (Te) , Polonium (Po)

A gas made up of individual atoms = Argon (Ag)

An element that forms 1+ ions = Lithium

The most reactive element in Group 1 = francium (it doesn't appear in the image)

The most reactive element in Group 7 = Fluorine

An element that is a good catalyst= Iron (Fe) Cobalt (Co) , Nickel (Ni)

An element that does not react with anything  = Argon

A metal that floats on water = Lithium

An element with a full outer energy of electrons = Helium (He), neon (Ne), and argon (Ar)

A transition Metal = Iron (Fe) Cobalt (Co) , Nickel (Ni)

A noble gas = Argon (Ar)

The element in Group 6 , Period 5 =   Molybdenum , Tellurium

A non-metal = Fluorine , Argon

A gas made up of Diatomic molecule = Argon (Ar)

An element that forms 1- ions =

The Group 1 element with the highest melting point =  Lithium

The Group 7 element with the highest boiling point = Astatine (As)

An element with 3 electrons in it's outer energy level = Boron

An element that forms coloured compounds = Iron

An element that has a coloured vapour = Chlorine  Fluorine

A metal that can form ions with different charges = Iron, Cobalt , Lead

Explanation:

Halogen : Are any of the six nonmetallic elements that make up Group 17  of the periodic table e.g  fluorine (F), chlorine (Cl), bromine (Br), iodine (I), astatine (At).

All elements in Group 1 are Alkali metals( except hydrogen)

Examples :lithium (Li), sodium (Na), potassium (K), rubidium (Rb), caesium (Cs), and francium (Fr).

A pure gas may be made up of individual atoms (e.g. a noble gas like neon), elemental molecules made from one type of atom (e.g. oxygen)

Argon is one of the inert gases that normally exist as single atoms.

Transition metals are good metal catalysts because they easily lend and take electrons from other molecules. A catalyst is a chemical substance that,  does not affect the thermodynamics of a reaction but increases the rate of reaction.

Transition metals ; Scandium. Titanium. Vanadium. Chromium. Manganese. Iron. Cobalt. Nickel.

Noble gases(inert gases) don't react with anything . The family of noble gases includes helium, neon, argon, krypton, xenon, and radon.

Lithium is the lightest metal and has density about half of water.

Group 18 elements (helium, neon, and argon are shown) have a full outer, or valence, shell.

chlorine, fluorine, carbon, nitrogen, arsenic, phosphorus, selenium are examples of non-metal.

Noble gases : helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), radon (Rn).

The following 5 element gases are found as diatomic molecules at room temperature and pressure:

Hydrogen – H. ...

Nitrogen – N. ...

Oxygen – O. ...

Fluorine – F. ...

Chlorine – Cl.

Lithium, Li melts at 180°C.

From the lowest boiling and melting point to the highest, the group in order is fluorine, chlorine, bromine, iodine and astatine.

Like other transition metals, iron forms coloured compounds. The table shows some examples of these. Note that iron can form two different ions in its compounds. Iron(II) compounds contain the Fe 2+ ion and iron(III) compounds contain the Fe 3+ ion.

Elements in group seven(Halogens)  : As you move down the group the halogens become darker in colour. For example fluorine is a very pale yellow whereas iodine will be dark purple in colour when it is in a vapour state.

A few elements, all metals, can form more than one possible charge. For example, iron atoms can form 2+ cations or 3+ cations. Cobalt is another element that can form more than one possible charged ion (2+ and 3+), while lead can form 2+ or 4+ cations.

Answer:

9.53g

Explanation:

Given the following :

Density = 1.065g/mL

Volume of solution = 25.0mL

% of acetic acid =58%

Molar mass of CH3COOH = 60.05g/mol

Molar mass of Ca(OH)2 = 74.093g/mol

Reaction:

2CH3COOH + Ca(OH)2 ----> Ca(CH3Co2)2 +2H2O

Volume of solution × density × % of CH3COOH × (mole per molar mass CH3COOH) × (mole of Ca(OH)2 per mole of CH3COOH) × (molar mass of Ca(OH)2 per mole of Ca(OH)2)

25mL × (1.065/1) × (58/100) × (1 / 60.05) × (1 / 2) × (74.093 / 1)

25 × 1.065 × 0.58 × 0.0166527 × 0.5 × 74.093

= 9.526g

The false statement is Option (d)

d) Suppose you were 60ft beneath the surface of ocean scuba diving and took a deep breath of air from your tank and held your breath. It is a good idea to start ascending without exhaling.

If you hold your breath while ascending to the surface, your lungs and the air within them expands as the water pressure weakens. since the air has no place to get out it will be pressurized between the wall of the lungs. It gets keep on swelling between the walls of the lungs .

Frequent changes in the pressure of the air which is present in the walls of the lungs during the ascending or descending without exhaling can cause a serious lung injury.

When a scuba diver descends to deeper depths in the oceans he has to breathe air through a device the compressed air consists of 71% nitrogen and 28% oxygen.

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5 seconds. 5x2=10.






(Don't know why you asked this here, the math is really simple)

Answer:

The percent composition by mass of nitrogen in (NH₄)₂CO₃ is approximately 29.13%.

Explanation:

To determine the percent composition by mass of nitrogen in (NH₄)₂CO₃, we need to calculate the mass of nitrogen relative to the total mass of the compound and express it as a percentage.

The molar mass of (NH₄)₂CO₃ is 96.11 g/mol

Now, let's calculate the mass of nitrogen in (NH₄)₂CO₃:

Mass of nitrogen = 2 × 14.01 g/mol = 28.02 g

To find the percent composition of nitrogen, we divide the mass of nitrogen by the molar mass of (NH₄)₂CO₃ and multiply by 100:

Percent composition of nitrogen = (Mass of nitrogen / Molar mass of (NH₄)₂CO₃) × 100

= (28.02 g / 96.11 g/mol) × 100

≈ 29.13%

Therefore, the percent composition by mass of nitrogen in (NH₄)₂CO₃ is approximately 29.13%.

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If the compound is ionic, it consists of a metal and a nonmetal. In this case, we write the symbol of the metal first, followed by the symbol of the nonmetal.

If the compound is molecular, it consists of nonmetals only. In this case, we use prefixes to indicate the number of atoms of each element. For example, if we have a compound formed between carbon (C) and oxygen (O), we write CO2 as the chemical formula.

To determine if the compound is ionic or molecular, we need to know the elements present in the compound. If it contains a metal and a nonmetal, it is ionic. If it consists of nonmetals only, it is molecular.

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The brightest star in our sky is Sirius. We can infer so because it has the smallest apparent magnitude (most negative).

The correct option is (a) Sirius's dog collar

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0.18 L of solution can be prepared using 7.55g of KCl if the final molarity is 0.55M.

Molarity (M) is known to be the amount of a substance in a given volume of solution which is usually is defined as the number of moles of solute per liter of solution.

Both molarity and molarity are measures of the concentration of a chemical solution. The main difference between the two is mass and volume. Molarity refers to the moles of solute to the mass of the solvent, and molarity refers to the moles of solute to the volume of the solution.

Let's calculate no. of moles first:

No. of moles = Mass/Molecular mass

Mass of given KCl = 7.55 g

Molecular mass of KCl = 74.5513 g/mol

No. of moles = 7.55/74.5513

No. of moles = 0.100 mol

Now, for the calculation of molarity:

Molarity = No. of moles/V of solution

0.55 = 0.100/V

V = 0.100/0.55

V = 0.18 L

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