Potassium sulfate has a molecular mass of 174.3 g/mol. How many grams of potassium sulfate do you need to dissolve in 0.987 liters of water to prepare a solution with 0.735 molarity?

Answer:  To date, approximately 1,200 dinosaur skeletons have been discovered.

Scientists can only guesstimate the other parts of the bodies of dinosaurs because a lot of times, partial skeletons have been found. Or even, when a full skeleton has been found, the skin and organs and everything else are gone. This leaves the scientists to make educated guesses about how they stood, what they looked like and everything else in between based on the skeletons they've found.

Answer:

This question appears incomplete

Explanation:

There is no such element known as "Ballardium (Bu)" in the periodic table. However, there are elements with a bit of similarity in spellings and pronunciation such as Beryllium (Be) which is found in group 2 (meaning it is an alkali earth metal), Berkelium (Bk) which is an actinide (meaning it is radioactive) and Vanadium (V) which is found in group 5 of the periodic table (meaning it's a transition metal).

Calories = 3346 calories

Given energy= 14.00KJ

For converting the joule energy into calories we divide the given value with 4.184

In calories= 14.00÷4.184

                = 3346 calories

Therefore by converting 14KJ we get 3346 calories

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Answer:

all you have to so answer it all done

Answer:

B.

Our pupils contract and expand depending on the amount of light at any given time in order to avoid being blinded and to see better in the darkness.

Answer:

Its D

Explanation:

Explanation:

Formula for Dichlorine trioxide is: Cl2O3

hope this helps you

have a great day :)

Q = Ksp = 1 × 10^(-12).

Substituting the values into the Nernst equation, we have:

0.799 V = E° - (RT/2F) * ln(1 × 10^(-12))

Now, solving for E°:

E° = 0.799 V + (RT/2F) * ln(1 × 10^(-12))

The value of R is the ideal gas constant, T is the temperature in Kelvin, and F is the Faraday constant.

To find the standard reduction potential at 25°C for the half-reaction Ag2CrO4(s) + 2e¯ → 2Ag(s) + CrO4²-(aq), we can use the Nernst equation, which relates the standard reduction potential (E°) to the equilibrium constant (K) and the reaction quotient (Q).

The Nernst equation is given as follows:

E = E° - (RT/nF) * ln(Q)

Given information:

Ksp = 1 × 10^(-12)

E = +0.799 V (standard reduction potential of Ag+ to Ag)

Since the reaction involves the dissolution of Ag2CrO4(s), the reaction quotient Q can be expressed as [Ag+]²/[CrO4²-].

Since the stoichiometry of the reaction is 2:1 for Ag2CrO4 to Ag+, we can say that [Ag+]² = Ksp.

Therefore, Q = Ksp = 1 × 10^(-12).

Substituting the values into the Nernst equation, we have:

0.799 V = E° - (RT/2F) * ln(1 × 10^(-12))

Now, solving for E°:

E° = 0.799 V + (RT/2F) * ln(1 × 10^(-12))

The value of R is the ideal gas constant, T is the temperature in Kelvin, and F is the Faraday constant.

Please note that without specific values for temperature (T) and the ideal gas constant (R), the exact standard reduction potential at 25°C cannot be determined.

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An organic compound's skeleton formula, also known as the line-angle formula or shorthand formula, is a type of molecular structural formula that acts as a shorthand for a molecule's bonding and some specifics of its molecular geometry.

An organic compound's skeleton formula, also known as the line-angle formula or shorthand formula, is a type of molecular structural formula that acts as a shorthand for a molecule's bonding and some specifics of its molecular geometry.

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The balanced chemical equation for the reaction is:

PCl5 + H2O → H3PO4 + HCl

To balance this equation, we need to make sure that the number of atoms of each element is equal on both sides of the equation.

To do this, we can start by balancing the phosphorus (P) and chlorine (Cl) atoms. There is one P atom and five Cl atoms on the left side of the equation, and one P atom and one Cl atom on the right side of the equation. We can balance these by adding a coefficient of 5 in front of HCl:

PCl5 + H2O → H3PO4 + 5HCl

Now we have five Cl atoms on both sides of the equation. Next, we can balance the hydrogen (H) atoms. There are two H atoms on the left side of the equation and five H atoms on the right side of the equation. We can balance these by adding a coefficient of 2 in front of H2O:

PCl5 + 2H2O → H3PO4 + 5HCl

Now we have two H atoms on both sides of the equation. Finally, we can balance the oxygen (O) atoms. There are two O atoms on the left side of the equation and four O atoms on the right side of the equation. We can balance these by adding a coefficient of 2 in front of H3PO4:

PCl5 + 2H2O → 2H3PO4 + 5HCl

Therefore, to balance this reaction, we need to use this balanced chemical equation:

PCl5 + 2H2O → 2H3PO4 + 5HCl

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There are 2.64 × 1022 molecules of sucrose present in this serving of fruit dessert containing 15.0 g of sugar.

To determine the number of molecules of sugar present in the serving, we need to calculate the number of moles of sugar and then convert it to the number of molecules.

Given:

Mass of sugar (sucrose) = 15.0 g

Molar mass of sucrose (C12H22O11) = 342 g/mol

First, calculate the number of moles of sugar using the formula:

Number of moles = Mass of substance / Molar mass

Number of moles of sugar = 15.0 g / 342 g/mol ≈ 0.0439 mol

Next, we use Avogadro's number, which states that there are approximately 6.022 × 10^23 molecules in one mole of a substance. Therefore, to find the number of molecules of sugar:

Number of molecules = Number of moles × Avogadro's number

Number of molecules of sugar = 0.0439 mol × 6.022 × 10^23 molecules/mol ≈ 2.64 × 10^22 molecules

Therefore, there are approximately 2.64 × 10^22 molecules of sugar present in this serving.

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The crystal lattice energy depends not only on the charge of the ions but also on the distance between the ions and the arrangement of the ions in the crystal structure.

Therefore, two ionic solids made of 1/-1 ions can have different crystal lattice energies if the ions have different sizes or if the arrangement of the ions in the crystal is different. A crystal lattice is a three-dimensional arrangement of atoms, ions, or molecules in a crystal that forms a regular repeating pattern. It is a fundamental concept in solid-state physics and chemistry, and understanding the crystal lattice structure of a material is essential for predicting its properties and behavior. The crystal lattice is described by its unit cell, which is the smallest repeating unit of the lattice that can be used to build the entire crystal structure. The crystal lattice energy is the amount of energy required to break the lattice and is influenced by the size and charge of the ions, as well as the arrangement of the ions in the crystal structure. The crystal lattice can also affect the physical properties of a material, such as its melting point, solubility, and conductivity.

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Answer:

C2H4(g) + 3O2(g) ----> 2CO2 + 2H2O(l)

Mg(s) + 2HCL(l) ----> MgCl2(aq) + H2(g)

Ionic bonding is a type of chemical bond that occurs when electrons are transferred between atoms to form ions. The resulting ions are attracted to each other by their opposite charges and form an ionic compound. Here is a summary of the information you provided:

Element: Na (sodium)

Number of valence electrons: 1

Dot structure: Na

Transfer of electrons: Na loses 1 electron to become Na+

Ions formed: Na+ and Cl-

Compound formed: Sodium chloride (NaCl)

Name of compound: Salt

Element: F (fluorine)

Number of valence electrons: 7

Dot structure: F

Transfer of electrons: F gains 1 electron to become F-

Ions formed: F- and Mg2+

Compound formed: Magnesium fluoride (MgF2)

Element: O (oxygen)

Number of valence electrons: 6

Dot structure: O

Transfer of electrons: O gains 2 electrons to become O2-

Ions formed: Ba2+ and O2-

Compound formed: Barium oxide (BaO)

Element: Li (lithium)

Number of valence electrons: 1

Dot structure: Li

Transfer of electrons: Li loses 1 electron to become Li+

Ions formed: Li+ and Cl-

Compound formed: Lithium chloride (LiCl)

Element: P (phosphorus)

Number of valence electrons: 5

Dot structure: P

Transfer of electrons: P gains 3 electrons to become P3-

Ions formed: Al3+ and P3-

Compound formed: Aluminum phosphide (AlP)

Element: N (nitrogen)

Number of valence electrons: 5

Dot structure: N

Transfer of electrons: N gains 3 electrons to become N3-

Ions formed: Al3+ and N3-

Compound formed: Aluminum nitride (AlN)

The process of the reduction of half-reaction of a redox reaction occurs at the cathode in a galvanic cell.

A redox reaction's half reaction is its component that involves either oxidation or reduction. By taking into account how each substance involved in the redox reaction has changed in oxidation state, a half reaction is obtained. To balance redox reactions, half reactions are frequently employed. The hydrogen ions in the half reaction must be balanced with H+ ions in acidic oxidation-reduction reactions after the atoms and oxidation numbers have been balanced.

An electrochemical cell in which an electric current is produced from spontaneous oxidation-reduction reactions is called a galvanic cell, while a voltaic cell is named after the scientists Luigi Galvani and Alessandro Volta, respectively. Galvanic cells are two types of electrochemical devices that use chemical energy from spontaneous redox reactions to produce electricity.

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Answer:

Where are the options??

We can't answer without them.

The body of a person is a marvel of design. The basic building blocks of life are tiny cells. Tissues, such as muscle and epithelial tissue, are made up of cell clusters. Organ systems contract  are made up of groups of organs,

Their primary quality is its capacity to contract. Muscles that are attached to bones, internal organs, or blood vessels move objects. The primary cause of practically all physical movement is muscle contraction.

Your capacity to walk, lift objects, send blood around your body, and even breathe, is supported by these muscles. When you think of your body's muscles, you probably concentrate on the ones you possess the most of. As these muscles are optional (VOL-uhn-ter-ee), you can control their movements.

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Answer:

56.96 grams

Explanation:

To find the mass of 1.78 moles of O2, we need to use the molar mass of O2, which is the mass of one mole of O2.

The chemical formula for O2 is O-O or simply O2. The molar mass of O2 is the sum of the atomic masses of two oxygen atoms, which can be found on the periodic table.

The atomic mass of oxygen (O) is approximately 16.00 g/mol. So the molar mass of O2 is:

Molar mass of O2 = 2 x atomic mass of O

= 2 x 16.00 g/mol

= 32.00 g/mol

Therefore, the mass of 1.78 moles of O2 is:

Mass = number of moles × molar mass

= 1.78 mol × 32.00 g/mol

= 56.96 g

So the mass of 1.78 moles of O2 is 56.96 grams.

The isotopes of bromine from the options would be Z = 35,  A = 79.

Isotopes are atoms of the same element with the same atomic number but different neutron numbers.

The atomic number of an atom is the number of protons present in the nucleus of the atom. Since elements are arranged according to their atomic number on the periodic table, isotopes of the same element will occupy the same position on the periodic table.

Now, considering the isotope of bromine (Br). The atomic number is 35. The atomic number is denoted as Z on the periodic table. The normal bromine atom has a mass number of 80. With 35 as the number of protons, the number of neutrons can be calculated as:

80 - 35 = 45.

Considering an atom with Z = 35, A = 79, means the atomic number is 35, which means it is a bromine atom. The mass number is 79 instead of 80.

79 - 35 = 44.

This means that the atom has 44 as the neutron number instead of 45. Thus, Z = 35, A = 79 is the only isotope of bromine.

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Answer:

cause they like it that way

Explanation:

btw cant tell if this is legit or not

Answer:

false

Explanation:

Answer:

its sodium hydroxide

Explanation:

60 27 cobalt isotope decays with a half life of 5.27 years to produce 60 28 nickel. The fraction of a sample of 60/27 cobalt isotope that will remain after 15 yrs is 0.125.

The number of half lives for a sample is calculated as

n=t/t(1/2)

Where, t=15yrs

t(1/2)=5.27 yrs

Therefore, number of half lives for 60 27 cobalt is

n=15 yrs/5.27 yrs=2.8463≈3

Let us assume that we will start with 100g of 60 27 cobalt. Then amount of cobalt remains at each decay is

At first decay, 100/2=50 g

At second decay, 50g/2 = 25g

At third decay, 25g/2=12.5 g

The fraction of sample remain after 15 yrs is

fraction = 12.5/100 = 0.125

Therefore, the fraction of a sample remain after 15 yrs is 0.125.

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Nitrous acid is a weak acid dissociation reaction, written using the H30 convention, is: HNO2 + H30 (where is used as the equilibrium symbol).

nitrous acid is an inorganic compound having the formula HNO3. It is a powerfully corrosive mineral acid. Although the material is colorless, older samples could have a yellow tint from nitrogen oxide decomposition. Most commercially available nitric acid has a 68% concentration in water. When the solution contains more than 86% HNO3, nitric acid flares. Depending on how much nitrogen dioxide is present, fuming nitric acid can also be categorized as red fuming nitric acid at concentrations above 86% or white fuming nitric acid at concentrations above 95%.

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Answer:

1.) Mixture can be defined as the physical combination of two or more substances which can be separated into its different constituents because it's not chemically bound together. A mixture can be homogeneous or heterogeneous.

Explanation:

3.) Homogeneous mixture appears UNIFORM while heterogeneous mixture appears IRREGULAR( non - uniform).

4.) A homogeneous mixture is a type of mixture in which the composition is uniform throughout the mixture. While a heterogeneous mixture is a mixture in which different sections have different compositions.

5.) Examples of Homogeneous mixture: the solution of salt and water.

Example of heterogeneous mixture: mixture of sand and water.

From the basic knowledge and definition of mixture in chemistry the above answers had been given.

Furthermore, a mixture contains two or more substances in any proportion. It can be heterogeneous or homogeneous. Examples of mixture include: sea water ( this contains salt and water and can be physically separated) or mud which contains dirt and water.

Homogeneous mixture are said to be uniform in appearance because because the dissolved material is present in the same amount throughout the solution. That is why sea water is known as a typical example.

Heterogeneous mixture are said to be irregular or non- uniform in appearance because the combined substances usually form different phases and layers which can be physically observed. This is seen in a mixture of sand and water or water and oil.

Answer:

E

Explanation:

The simple rule of thumb is that as the atomic or molar mass of an atom increases, the entropy increases. This means that more the mass more will be entropy.

The atomic mass of various elements is as follows

Ne = 20 g/mol

Xe = 131 g/mol

He = 4 g/mol

Ar = 40 g/mol

Kr = 84 g/mol

Therefore, the order of increasing entropy must be

He<Ne<Ar<Kr<Xe.

Hence, option E is the correct answer.

Answer:

0.8853 mL

Explanation:

First we convert 13 lb to kg, keeping in mind that 1 lb = 0.454 kg:

Then we calculate how many mg of acetaminophen should be given, using the recommended dose and infant mass:

Finally we calculate the required mL of suspension, using its concentration:

Answer:

If a measurement closely matches the recognized standard for that measurement, it is considered accurate.

Explanation:

Precision:

“Precision means how close the measured values are to each other.”

A precise measurement is one that has less absolute uncertainty.

Measurement of Precision:

The Precision of measurement is found out by the instrument being

used. It is described by the least count of the measuring instrument. The smaller a physical quantity, the more precise instrument should be used.

Example:

Let the length of a pencil is measured with a meter rod and vernier caliper.

It shows that readings of the vernier caliper are more precise than the metering rod.

Answer:

help pls

Explanation:

Answer:

the molar mass of the gas is approximately 0.956 g/mol