Round each measurement to three significant figures. Write your answers in scientific notation.
a. 8758.073 meters

b. 435,200,000

c. 0.001552 meter

d. 0.009009 meters

e. 177,888 meters

f. 629.55 meters

carbonic acid (h2co3) is a weak acid formed when carbon dioxide dissolves in water. The ions present in a carbonic acid solution are H+ and HCO3–.

Carbonic acid is a weak acid with a chemical formula of H2CO3. In the presence of water, the partial dissociation of the carbonic acid occurs to produce H+ and HCO3– ions.

It is an inorganic compound also known as diprotic acid because it can form two types of salts; carbonates and bicarbonates. It is produced at industrial level as a by-product during the burning of the fossil fuels.

Carbonic acid is used to prepare carbonated water, sparkling wine. It can also be used to remove carbon dioxide from water.

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Polar covalent bonds are the type of covalent bond found between oxygen and hydrogen in water molecules

Water is a Polar Covalent Molecule

The choppy distribution of electrons among atoms and the uneven form of the molecule way that the water molecule has poles - a superb price at the hydrogen pole (side) and an oxygen Negative price at the poles (flanks)).

A water molecule includes hydrogen atoms covalently bonded to the equal oxygen atom. Oxygen atoms are electronegative and entice covalent electrons in covalent bonds.

The bond among the oxygen and hydrogen atoms withinside the water molecule is a polar covalent bond. H. Electrons aren't shared similarly among oxygen and hydrogen. Oxygen has a better affinity for electrons than hydrogen.

A polar covalent bond is a bond wherein the electron pairs are shared similarly among the 2 bonding atoms, and a polar covalent bond is a bond wherein the electron pairs are shared unequally among the 2 bonding atoms. Polar bonds are a result of variations in electronegativity.

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If reaction occurs with an 73.9% yield, the mass of iron which should be reacted to produce 63.0 g of Fe₂O₃ is 59.1 g

The balanced chemical equation of the reaction is :

                   4Fe + 3O₂ → 2Fe₂O₃

Molar ratio of iron and Fe₂O₃ is 4 : 2

For a reaction having 100 % yield, every 4 mole of iron will produce 2 moles of Fe₂O₃.

So, 63.0 g of Fe₂O₃ is produced by reaction. Let's use molar mass of Fe₂O₃ , which is 159.6 g/mol to find out number of moles produced.

              moles =      63.0 g     = 0.39 mol

                             159.6 g/mol

moles of iron needed  if % yield is 100.  

= 0.39 mol x 4 mol

                      2 mol

= 0.78 mol Fe

Since given percentage yield is 73.9%, more Fe is reacted.

       % yield =    actual yield     x 100

                      theoretical yield

         73.9 % =         63.0 g           x 100

                         theoretical yield

         Theoretical yield = 85.2 g

So, to find out mass of iron reacted to theoretically produce 85.2 g Fe₂O₃

Use molar mass of Fe and mole ratio of two compounds.

        moles = 85.2 g         = 0.53 moles Fe₂O₃

                     159.6 g/mol

using this,

 = 0.53 Fe₂O₃  x     4 moles Fe    

                 2 moles Fe₂O₃

 = 1.06 moles Fe

So,

The mass of iron = ( 1.06 x 55.8 )g

                            = 59.1 g

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3.45g sulfuric acid will be present in the mixture after the reaction is complete.

H₂SO₄ (aq) + Pb(CH₃COO)₂ (aq) ⇌ PbSO₄ (s) + 2 CH₃COOH (aq)

1 mole of sulphuric acid reacts with 1-mole lead(II) acetate to give 1-mole lead(II) sulfate and 2-mole acetic acid.

Mass of lead acetate reacting = 5.00g

Mass of sulphuric acid reacting = 5.00 g

Now, calculating the no. of moles of each reactant involved:

No. of moles = [tex]\frac{Given mass of substance}{Molar mass of substance}[/tex]

Moles of sulphuric acid = [tex]\frac{5.00g}{98.08g}[/tex]  

                                       = 0.510 mol

Moles of lead acetate = [tex]\frac{5.00g}{325.29g}[/tex]

                                    = 0.0158 mol

Thus,  0.0158 moles of lead acetate will react with 0.0510 moles of sulphuric acid to give 0.0158 moles of lead sulfate and 0.0158 × 2 = 0.0316 moles of acetic acid.

Therefore, only 0.0158 moles of sulphuric acid will react.

So, the remaining moles = 0.510 - 0.0158

                                         = 0.0352 mol

Remaining mass of sulphuric acid = 0.0352 × 98.08

                                                        = 3.45g

Hence, 3.45g sulfuric acid will be present in the mixture after the reaction is complete.

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Solutions of sulfuric acid and lead (II) acetate react to form solid lead (II) sulfate and a solution of acetic acid, 5.00 g of sulfuric acid, and 5.00 g of lead(II) acetate are mixed. Calculate the number of grams of sulfuric acid present in the mixture after the reaction is complete.

3.733mol potassium ions are in 5.48 g of potassium sulfate: k2so4

The molar quantity of potassium sulfate:

Here 5.48 g of potassium sulfate and molecular weight of potassium sulfate is 174.27 g/mol  are given so  5.48 g / 174.27 g/mol = 0.031mol

0.031mol potassium sulfate, there are 2×0.031=0.062mol with respect to potassium ion

we multiply this molar quantity by avagadro's no

avagadro's no=6.022×10²³

0.062×6.022×10²³=3.733mol

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When you purchase 0.500 gallon of milk, 7.89mL of milk are there in the container

Unit of liquid capacity equal to four quarts or 231 cubic inches or 3.785 liters called gallon. here 1 gallon = 3.785 l and you purchase 0.500 gallon so multiply the no of cubit feet by 7.47 then and here

volume is 8 then 8×7.47=59.76 so  

1 gallon = 3.785=59.76÷3.785=15.78

15.78×0.0500gallon=7.89ml

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Answer: hope this helps :)

Explanation:

Heterogeneous:

soy sauce, pizza, fruit salad, halo halo, iced mango juice (assuming this is a mango milkshake), sago milk tea

Homogeneous:

vinegar, salt solution, sugar syrup

abno ka hahaha hatdog hamburger

Most combustibles, when burned with just the stoichiometric amount of air, under conditions where no heat is lost, will produce flames between the temperature range of 2100-2300 K.

Combustion is a chemical process in which a substance reacts rapidly with oxygen and gives off heat. The original substance is referred to as the fuel and the oxygen's source as the oxidizer. Although it is typically a liquid for airplane propulsion, the fuel can be a solid, liquid, or gas. However, combustion is a chemical reaction between substances, usually including oxygen, and usually accompanied by the generation of heat and light in the form of flame.

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A covalent bond involves: d. sharing electrons

The atoms of a molecule are held together by electrical forces that hold the atoms together, this is due to the electrical attraction between the electrons of the atom of one element and the nucleus of the other atom, this force of attraction is called covalent bond.

A covalent bond involves the sharing of electrons that are in the last energy layer of the atoms because they are the most likely or willing to be shared.

An example of a covalent bond is the bond between a hydrogen atom and a carbon atom in methane.

The atom is the smallest part of the composition of matter, it is indivisible and is composed of a nucleus that has protons and neutrons, and around the nucleus there are the electrons.

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The volume of sand plus air that the teacher order is 14.4 x 10^4 ft3.

Volume is defined as the space occupied within the boundaries of an object in three dimensional space. It is also known as capacity of the object.

The SI unit of volume is liter.

To calculate the volume of sand :

Density = mass / volume

As density is given 0.70g/ml and mass of sand is 22kg then,

Volume = mass/ density

             = 22 / 0.7g/ml = 31.43 g/ml or cm3

As sand plus air is 1.3 time much as volume of sand alone,

Then 31.43g/ml = 31.43 x 1.3 = 40.86 g/ml  or cm3

40.86 cm3 is equal to 14.4 x 10^4 ft3

Thus, the volume of sand plus air that the teacher order is 14.4 x 10^4 ft3.

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The mass of nugget is 106.446 grams.

We are given the density and volume of the gold nugget in the question. Now, to find the mass of gold nugget, we need to relate the three quantities. The relation between them is as follows -

Density = mass÷volume

Rewriting the formula according to mass

Mass = density × volume

Converting the volume from cm³ to liters. As per the known fact,

1 liter = 1000  cm³

So, 0.00369 liters = 3.69  cm³

Keep the values in formula to find the mass

Mass = 31.4×3.69

Performing multiplication to find the mass of gold nugget

Mass = 106.446 grams

Hence, the mass of gold nugget is 106.446 grams.

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Answer:

1600 mm to m = 1.6 meters

Explanation:

Answer:

NaCl: sodium chloride.

NaBr: sodium bromide.

NaF: sodium fluoride.

NaI: sodium iodide.

KF: potassium fluoride.

Explanation:

Hope this helps!

It is given that volume & density of liquid = 30.0ml = 1.52 g/ml

is read Density is as 1.529  g/ml

mass of Ime of liquid is 1.529.

option A is correct.

So, the mass of 30 ml liquid. = (1.52 x 30 g/ml ml =

1.529 X 30 g

45.69 g

the question is incomplete

A liquid is a nearly incompressible fluid that conforms to the shape of its container but maintains (nearly) constant volume regardless of pressure. As such, it is one of the four fundamental states of matter (the others being solids, gases, and plasmas) and is the only state with a definite volume, but no fixed shape. Liquids are made up of tiny vibrating particles of atom-like matter held together by intermolecular bonds. Like gases, liquids can flow and take the form of containers.

The volume of a liquid is fixed, but the shape is not. Examples of liquids are water, oil, and blood. A liquid is a state of matter that has a fixed volume but no fixed shape. That is, the liquid takes the shape of its container. The matter is something that takes up space and has weight. Solids keep their shape, liquids take the shape of their containers, and gases fill their containers.

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You have to calculate the mass of a 30.0 mL liquid sample with density of 1.52 g/mL, but you have forgotten the formula. Which way of reasoning would help you in finding the correct mass?

Select one:

a. If 1 mL of a liquid has the mass of 1.52 g, then 30.0 mL has the mass of _____ g.

b. If 1.52 mL of a liquid has the mass of 1 g, then 30.0 mL has the mass of _____ g.

The potential energy stored in high-energy bonds is commonly harnessed when the bonds are split by the addition of water in a process called hydrolysis.

Hydrolysis of high-energy compound (ATP) using water:

ATP + H2O → ADP + Pi

ATP is short for adenosine triphosphate.

Adenosine triphosphate converts to either the adenosine diphosphate (ADP) or adenosine monophosphate (AMP), in this process energy is released.

ATP is made of three components: the triphosphate, the sugar ribose and a nitrogenous base (adenine).

In cellular respiration where organic matter is transformed into carbon dioxide and energy is released for production of ATP.

Glucose and oxygen are reactants and carbon dioxide, water and energy are products of this chemical reaction; cellular respiration creates an energy molecule (ATP) when glucose is broken down.

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In the biochemistry, Where reactants are normally dissolved in water, The strongest bond or interaction in the water is polar covalent bonds.

Water is a good solvent for polar and ionic compounds. the polarity and hydrogen bonding capability of water makes excellent solvent for polar molecules.In water ionic bonds come apart much more than covalent bonds.

The polarity  of water molecules is what makes a widely good solvent . The positive part of the water molecules attract negative part of solute and negative part of water attract positive part of solute.

Water greatly weaken the electrostatic forces and hydrogen bonding between ionic and polar molecules by competing for their attraction.

Hydrogen bonds are weaker than ionic bond and covalent bonds but stronger than dipole dipole interaction.  

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A solution has been prepared with 100 g of drug in 1,000 ml solution mg of drug are in 120 ml of the solution is 12000 mg

1,000 ml solution requires =100g of drug;

1 ml solution requires =100÷1000 g of drug;

                                   = 0.1g of drug;

120 ml solution requires =0.1×120g of drug;

                                       = 12g of drug;

                                        = 12000 mg of drug;

The present clinical use of H2O2 continues to be constrained to the elimination of microbial infection and every now and then hemostasis, better information in the direction of the sterilization ability and cell behavior regulatory characteristic of H2O2 inside wounds will decorate the ability to exogenously augment and control recovery.

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Increased quantities of Mitochondria in the muscle cells leads to produce great amount of energy.

What are skeletal muscle cells?

Skeletal muscle fibers are very elongated cells with a sarcolemma, a very elastic and resilient plasma membrane. Muscle fibers are referred to as syncytiums because they are distinguished by the presence of many nuclei near the cell's edge.

Myocytes, or muscle cells, are the cells that make up muscular tissue. Long, cylindrical, multi-nucleated, and striated cells make up skeletal muscle. Due to their high energy needs, skeletal muscle cells have numerous mitochondria that enable them to produce enough ATP.

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When a protein of 50 nanometers is mixed with water, the opaque result is called a: suspension.

A suspension is a heterogeneous combination of two or extra substances. In it, the particles are suspended for the duration of the solution in bulk and can be easily viewed by means of bare eyes.

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The numerical value of the Ksp  of [tex]BaSO_{4}[/tex] is 1.69 * 10^-20.

The Ksp is an equilibrium constant that shows the extent to which a substance is soluble in water. Now consider the fact that [tex]BaSO_{4}[/tex] is almost insoluble in water.

i) The Ksp of the [tex]BaSO_{4}[/tex] solution can be obtained from the relation;

Ksp = [[tex]Ba^{2+}[/tex]] [[tex]SO_{4}^{2-}[/tex]]

ii) The numerical value of the Ksp is obtained from; [1.30 × 10–10]^2 = 1.69 * 10^-20

iii) The reason for the toxicity of [tex]BaCO_{3}[/tex] even though it is not more soluble that barium sulfate is that [tex]BaCO_{3}[/tex] can dissolve in the gastrointestinal tract which is acidic leading to barium poisoning.

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Submicroscopic events are the structure and behavior of the matter or particle that can use for the macroscopic observations of the matter.

Sub microscopic elements are very minute and small particles that can be only seen by a microscope. These are small particles that together make the big matter.

Macroscopic particles are big particles that are constituted by small particles.

Thus, the structure and behavior of the matter or particle that can be used for macroscopic observations of the matter are submicroscopic occurrences.

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In addition, the sodium-potassium pump activates integrators that regulate the Mitogen-Activated Protein Kinase (MAPK) Pathway, intracellular calcium, and reactive oxygen species. The majority of the ATP produced by human cells is used to maintain sodium (Na+) and potassium (K+) concentration gradients.

Sodium and potassium move in the opposite direction of the concentration gradients. The Na+ K+-ATPase pump maintains a gradient of higher sodium concentrations extracellularly and higher potassium levels intracellularly.

The sodium-potassium pump is a cellular mechanism that transports sodium and potassium ions in opposite directions against a concentration gradient using Adenosine triphosphate (ATP). The pump mechanism's purpose is to keep the potassium ion concentration constant.

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The corrcet answer is option D: About half of the buffer molecules are dissociated.

Buffers work best when about half of the buffer molecules are dissociated.

In chemistry, an aqueous solution that can resist change in pH when acidic or basic substances are added to it is called a buffer solution.

The main components of a buffer are a weak acid and a conjugate base and vice versa.

When an acid or a base is added to it, it cancels out its effects and makes the solution neutral.

In this way, it maintains a very stable pH of the solution under all conditions.

For a chemical reaction, buffers are really important and handy solutions.

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The main function of a vitamin is to help interaction between two chemicals to occur, changing both chemicals.

In toxicology, synergism refers to the effect caused when exposure to two or more chemicals at one time results in health effects that are greater than the sum of the effects of the individual chemicals.

What are vitamins?

Therefore, the main function of a vitamin is to help interaction between two chemicals to occur, changing both chemicals.

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The number of moles in monochloro pentaborane (9) [tex]B_5H_8Cl[/tex] is 0.37056.

We know that ,

Number of moles =   Given mass/ Molar mass

Given mass of monochloro pentaborane (9) is 20.1 g

The molar mass of monochloro pentaborane (9) is

                                        =  [tex]5*B + 8*H + Cl[/tex]

                                        =  [tex]5* 10.811 + 8 * 1 + 35.453[/tex]

                                        = 54.241

Thus number of moles =  20.1/54.241

                                      = 0.37056

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28 grams of iron will be needed to react completely to form 40 grams of iron oxide.

The atomic mass of iron, 2 Fe = 112

The molecular mass of iron oxide (III) = 160

We have to find how many grams of iron are required to form 40 grams of iron oxide.

By using the comparison formula, we get,

The atomic mass of iron/ Molecular mass of iron oxide = Mass of iron/mass of iron oxide.

Mass of iron = 112/160 × 40

Or, the mass of iron = 28grams.

Therefore, 28 grams of iron will be required to react completely to form 40 grams of iron oxide.

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Proteins are composed of amino acid

Protein is constructed from amino acids. An extended chain of amino acids makes up proteins. There are a huge variety of proteins in your body, each of which performs a vital function.

Amino acid sequences differ for every protein. The protein can adopt various shapes and perform a variety of bodily tasks depending on the sequence.

The alphabet's letters can be compared to amino acids. You can create new words by combining letters in various ways. Similar principles apply to amino acids; by combining them in different ways, proteins of various types can be created.

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The concentration gradients are established and maintained by the sodium potassium - potassium exchange pump is the concentration of potassium (k+) is found higher inside the cell (neuron) and the concentration of sodium (Na+) is found higher outside the cell.

The sodium - potassium pump is an active transport that exchange sodium ions for potassium ions.Active transport is the energy - requiring process of pumping molecules and ions across membranes , against concentration gradient.

To move molecules against the concentration gradient , carrier protein is needed.The Na / K+ pump use the energy of ATP molecule to exchange the ions.

The Na+ / K+ Pump goes through cycles to maintain a negative membrane potential.Three sodium ions exit the cell while two potassium ion enters in the cell for every single ATP consumed.

Thus , the sodium - potassium pump maintains the gradient of high concentration of N+ extracellularly and high level of K+ intracellularly.

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Alcohols (O-H), acids (COOH), or amines (NH2)-polar groups are need to be present in the R group for hydrogen.

This type of functional group contains only hydrogen and carbon as constituent elements. They are commonly represented with ‘R’. They are also called hydrocarbyl groups. The bonding between the carbon atoms can be single, double, or triple.

When we define a functional group, we imply a group of atoms of the same or different elements forming a chemically-active section of a compound and creating a class of new compounds. In organic chemistry, there are many such functional groups. For example, an alcohol group (-OH) defines a particular set of characteristics of the compounds that have it as a constituent. These characteristics will vary from one functional group to the other.

Therefore,

Three function groups  Alcohols (O-H), acids (COOH), or amines (NH2) needs to be present in the R group for hydrogen.

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