Matter is a substance that has ________.

The orbitals that overlap to form the c-h bond in ethene (h2c=ch2) is  s-sp2. The correct option is d.

Orbitals are wave functions that are the places where the electrons can be found. There are different orbitals present. These are s, p, d, and f. Orbitals are of different shapes. Round orbital and eight-like shapes.

Each carbon atom is joined to two hydrogen atoms in the ethylene molecule. Therefore, for the C-H sigma bonds in ethylene, overlap two sp2-hybridized orbitals with the 1s orbitals of two hydrogen atoms.

Thus, the correct option is d. s-sp2.

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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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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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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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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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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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The formula weight of ammonium sulfate ((NH₄)₂SO₄), rounded to the nearest integer, is 132 amu

Ammonium sulfate ((NH₄)₂SO₄) formula are as follow:

((NH₄)₂SO₄)

Now,28+8+32+64  = 132gm/mol

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Answer:

0.036g

Explanation:

I've learned about sig figs

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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HTQ would be the most likely daughter cell genotype if independent assortment does not occur.

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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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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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The difference between ideal gases and real gases are most pronounced under conditions of inter molecular forces.

Difference between ideal gases and real gases are discussed below :

Real gases differ from ideal gases thanks to the presence of inter molecular forces, which cause the molecules of a true gas to deviate from perfect random motion.

As a result, real gases deviate from the perfect gas law at high densities and low temperatures, where the results of inter molecular forces are more pronounced.

So, the difference between ideal gases and real gases are most pronounced under conditions of inter molecular forces.

What are inter molecular forces?

The attractive forces that exist between molecules are liable for many of the bulk physical properties exhibited by substances.An inter molecular force (IMF) (or secondary force) is that the force that mediates interaction between molecules, including the electromagnetic forces of attraction or repulsion which act between atoms and other sorts of neighboring particles, e.g. atoms or ions.

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Gases other than compressed air are normally supplied in pressurized cylinders at 1500 psi to 2000 psi.

What are compressed gas cylinders used for?

Cylinders of industrial compressed gas used in oxyfuel welding and steel cutting. A gas cylinder is a type of pressure container used to store and contain gases at pressures higher than atmospheric pressure.

Thus, typically, pressurized cylinders containing gases other than compressed air are delivered at pressures between 1500 and 2000 psi.

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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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Banded iron formations are made of minerals like iron-rich silicates and iron-rich carbonates.

Banded iron is the sedimentary rocks that are formed by the iron-rich contents and iron-rich carbonates and silicates. These minerals are hematite and magnetite.

The organisms that release oxygen are converted into iron oxides underwater, and they form sedimentary rocks like banded iron. The oxides are composed on the ocean floor, and they turn into rocks.

Thus, the correct minerals for banded iron formation are iron-rich silicates and iron-rich carbonates.

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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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The correct set is N, S, and I.

The right combination is N, S, and I.

The ions of two separate elements, one of which is a metal and the other a nonmetal, make up a binary ionic combination. As a result, in binary ionic compounds, metals form cations and non-metals produce anions. As non-metals, nitrogen (N), sulfur (S), and iondine (1) produce anions in binary ionic compounds  anions.

Since Li is a metal, it cannot form an anion.

The other sets are wrong.

Being metals, Rb and Al do not form.

Sr, Ni, and other metals are not anions since they are metals.

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The items can be used to control the boiling when heating liquid is in a round bottom flask are boiling chips or stones,a stir bar and stir plate.

What is Boiling?

When a liquid is heated to its boiling point, which is the temperature at which the vapour pressure of the liquid equals the pressure placed on it by the surrounding atmosphere.

Because they provide even boiling and stop the solution from boiling over, boiling stones are very helpful in chemical labs. These chips are designed to be porous in order to permit the formation of solvent vapors in the air cavities.

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Aerobic refers to exercise that primarily uses the oxygen-dependent energy system, oxidative phosphorylation.

Aerobic Respiration is the method of cellular respiration that takes place in the presence of oxygen gasoline to produce electricity from food. This type of breathing is frequent in most of the plant life and animals, birds, humans, and different mammals. In this process, water and carbon dioxide are produced as quit products.

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Answer:soluble

Explanation: bc its less then NaOh

A suitable hypothesis for the above experiment conducted by the chemist is as follows: IF the temperature is increased, THEN the rate of chemical change will also increase.

Experiment is a test under controlled conditions made to either demonstrate a known truth, examine the validity of a hypothesis, or determine the efficacy of something previously untried.

A hypothesis is an educated guess or a tentative conjecture explaining an observation or scientific problem.

According to this question, a chemist is designing an experiment to investigate the effect of temperature on the rate of a chemical change.

This suggests that a suitable hypothesis for the above experiment conducted by the chemist is as follows: IF the temperature is increased, THEN the rate of chemical change will also increase.

Also, the Independent variable is the temperature because it is the variable that is changed.

Dependent variable is the rate of chemical change because it is the measured variable.

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Answer:

A suitable hypothesis for the above experiment conducted by the chemist is as follows: IF the temperature is increased, THEN the rate of chemical change will also increase.

Independent variable - Temperature

Dependent variable - Rate of chemical change

controlled variable - pressure or concentration of the reactants

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

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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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 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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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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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.

To prepare the HCl solution if 1% m/v HCL was available, take 2.5ml of the stock solution and makeup to mark with 7.5 ml of water.

HCl is hydrochloric acid, and it is a highly reactive and strong acid.

Given, the dilution formula

C₁V₁= C₂V₂

C₁ = initial concentration

V₁ = initial volume

C₂ = Final concentration

V₂ = final volume

The values are

C₁ = 1% m/v

V₁ = ?

C₂ = 0.25% m/v

V₂ =  10 ml

V₁  = C₂V₂/C₁

V₁  = 0.25% m/v ×  10 ml /1% m/v

V₁  = 2.5 ml

Thus, the amount of HCl is 2.5ml of the stock solution. The amount of water is 7.5 ml of water.

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