The higher the pH, the less acidic the solution

The bond angle of sulfur difluoride (SF₂) is < 109.5 °

hydrogen sulfide (H₂S) Bond angle < 109.5  °

carbon tetrafluoride ([tex]CF_{4}[/tex]) is 109.5 °

and chloroform ([tex]CHCl_{3}[/tex]) is 109.5 ° .

The bond angle of  sulfur difluoride and hydrogen sulfide is less than 109.5  ° due to repulsion in the two lone pair of the electron present in these molecule .

Electron repulsion between the linked pairs and bond angles rise as the central atom's remaining electron density increases . The higher bond angle of ammonia (106.6°) than [tex]NF_{3}[/tex] (102.2°) can also be attributed to the electronegativity theory .

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Answer:

it is A trust me I know thank you

-300;800 is the correct answer

Answer:

an electron charge is -1

The body of scientific knowledge is based on different Observations (Option C).

Observations in the scientific method are fundamental because it is the first step to raising scientific questions that may be explained through plausible hypotheses. Subsequently, hypotheses must be tested by experimental procedures.

In conclusion, the body of scientific knowledge is based on different Observations (Option C).

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Answer:

Percent Composition (C)  =  71.40%

Explanation:

To find the percent composition of carbon by mass, you need to (1) calculate the molar mass of C₂₀H₂₉FO₃ (using the atomic masses of each atom in the molecule), then (2) calculate the total amount of carbon in C₂₀H₂₉FO₃ (using the atomic mass of carbon), and then (3) calculate the percent composition of carbon.

(Step 1)

Atomic Mass (C): 12.011 g/mol

Atomic Mass (H): 1.008 g/mol

Atomic Mass (F): 18.998 g/mol

Atomic Mass (O): 15.999 g/mol

Molar Mass (C₂₀H₂₉FO₃):

20(12.011 g/mol) + 29(1.008 g/mol) + 18.998 g/mol + 3(15.999 g/mol)

=  336.447 g/mol

(Step 2)

Atomic Mass (C): 12.011 g/mol

Total Mass (C): 20(12.011 g/mol) = 240.22 g/mol

(Step 3)

                                                  mass of carbon
Percent Composition (C)  =  -----------------------------  x  100%
                                                 mass of molecule

                                                   240.22 grams
Percent Composition (C)  =  -----------------------------  x  100%
                                                  336.447 grams

Percent Composition (C)  =  71.40%

The equation of the reaction is 5Ca(OH)₂ + 3H₃PO₄ ---> Ca₅(PO₄)₃(OH) + 9H₂O. The mass of hydroxyapatite that could form is 159.7 g

We know that it is not possible to obtain the solutions to a problem of this sort unless we are able to obtain the balanced reaction equation. This is the only way that we are able to apply the stoichiometry solve the problem.

We have the balanced reaction equation as;

5Ca(OH)₂ + 3H₃PO₄ ---> Ca₅(PO₄)₃(OH) + 9H₂O.

Number of moles acid =  128 g /98.00 g/mol = 1.31 moles

Number of moles of calcium hydroxide = 113 g/ 74 g/mol = 1.59 moles

If 5 moles of calcium hydroxide reacts with 3 moles of acid

1.59 moles of calcium hydroxide reacts with 1.59 moles *  3 moles / 5 moles

= 0.954 moles

Hence  calcium hydroxide is the limiting reactant.

Now;

5 moles of  calcium hydroxide yields 1 mole of hydroxyapatite

1.59 moles  of  calcium hydroxide yields   1.59 moles  * 1 mole /5 moles

= 0.318 moles of hydroxyapatite

Mass of hydroxyapatite  = 0.318 moles  * 502.3 g/mol

= 159.7 g

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The total mass , reported to the appropriate number of significant figures of three samples of granite when it were massed is 137.9 g .

Here we know that ,

Mass of the first granite sample = 67.4 g

Mass of the second sample = 43.2  g

Mass of the third sample = 27.3 g

We want to get the total mass for the three granite samples ,  then what we need to do is just add the three values that we know , this will give:

Total mass = 67.4 g + 43.2 g + 27.3 g = 137.9 g .

We conclude that the total mass of the three samples is 137.9 g .

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A series of concentric circles make form the geometric shape known as the annulus. Each circle has the same radius, and there is an equal distance between them. Both the size of a circular region and the circumference of the circle can be determined using the annulus.

An animal or plant's annulus is a ring-shaped structure. The portion of the stem that holds the leaves in place on plants is known as the annulus. The stem's annulus, which similarly shrinks to let the plant move, is another example of this. The portion of the skeleton that encircles the spinal cord in animals is known as the annulus. The annulus helps to maintain the body upright while safeguarding the spinal cord.

A new ring is built on a molecule via the chemical reaction known as annulation in organic chemistry. Helicenes and acenes are two examples of side-on condensed cyclic segments that are used to build annular molecules.

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The following choice is not a chemical property is Copper compounds often form beautiful blue crystals when a solution of a given copper compound is evaporated slowly.

Chemical Property is defined as the any substance's or particles properties that can be seen changing before and after is known as chemical property.

Ignitible, pH value, chemical stability are some of the properties of chemical property.

The other options are chemical property first one is burning a piece of cloth and leave another acid, another one is forming a gas, the another one is also changing the property into soluble form , and the last one is wound is fizzing so it is also a chemical property.

Hence, the option (c) isn't a chemical property.

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Answer:

1.93 2.86

Explanation:

exactly the reason for the above text

A polystyrene cup is used to minimise  the thermal energy loss because polystyrene cup is acts as a very good insulator.

It is important to use polystyrene cup to minimise thermal energy loss because it prevent the heat energy loss as it has air bubbled trapped inside them. if we hold a hot coffee in a polystyrene cup , the hot coffee does not burn your finger because it is a bad conductor of heat. it is a natural insulator. we can also use this styroform or polystyrene idea to make home warm in cold region , it reduce the transfer of heat ,so  that building stays warmer.

We can use plastic foam to reduce heat energy loss .  Both polystyrene and plastic foams are the good insulators and bad conductor of heat.

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The half life of radioactive iodine 137 is 8 days 0.0866 iodine nuclei are necessary to produce an activity of 1.0 micro Ci

Here given data is half life of radioactive iodine 137 = 8days

Activity of iodine is = 1.0micro Ci

Radioactive decay is the process by which an unstable atomic nucleus loses energy by radiation and the material containing unstable nuclei is considered radioactive

The interconnection between the decay constant and half-life of any sample can be given by the expression are

T1/2 = (0.693/R); T1/2 = 8

8 = 0.693/R;  R=0.0866 R=0.693×1.0/t1/2 = 0.0866

0.0866 iodine nuclei are necessary to produce an activity of 1.0 micro Ci

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The equipment we used to prepare 250 ml of a 0.010 M solution of NaCl from a stock solution is Volumetric flask (piece of lab).

It is calibrated to comprise a precise volume (v) at a given temperature.

It is used for accurate results in dilutions and to prepare a solutions that is needed according to the experiment.

Volumetric flask short form is vol flask.

A stock solution is defined as the standard solution made using nearly accurate experiment.

Example of stock solution - Two M sol of tris-HCL, 5M sol of NaCl.

Stock Solution formula = C1*V1 = C2*V2

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The difference between the ideal pressure and the pressure calculated by the Van Der Waal equation is 2.08 atm.

In this problem, we are mandated to obtain the pressure both by the use of the ideal gas equation and then the use of the Van der Walls equation.

Using the idea gas equation;

PV = nRT

P = nRT/V

P = pressure

V = volume

n = number of moles

T = temperature

R = gas constant

P = 1 * 0.082 * (24 + 273)/0.5

P = 48.7 atm

Using the Van Der Wall equation:

P = RT/(V - b) - a /V^2

P = 0.082 * 297/(0.5 - 0.03219) - 1.345/(0.5)^2

P = 24.354/0.46781 - 1.345/ /0.25

P = 52 - 5.38

P = 46.62 atm

The difference between the ideal pressure and the pressure calculated by the Van Der Waal equation is; 48.7 atm - 46.62 atm = 2.08 atm

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Answer:

The hydrogen ion concentration in mol/L

Explanation:

Answer:

The pH of a solution is a measure of hydrogen ion concentration in mol/L

Explanation:

the concentration of hydrogen ions in a solution expressed usually in moles per liter or in pH units and used as a measure of the acidity of the solution

Answer:

CH4

Explanation:

Since it's a hydrocarbon, ignore the reds, only looks at the white and grey,

The empirical formula of the hydrocarbon based on these products, CH₄. The molecular name of  CH₄ is methane.

An organic substance made completely of hydrogen and carbon is called a hydrocarbon. Examples of group 14 hydrides include hydrocarbons. The majority of hydrocarbons are colorless and hydrophobic, and their scents are either insignificant or best characterized by those of gasoline and lighter fluid.

The four different kinds of hydrocarbons are alkanes, alkenes, alkynes, and aromatic hydrocarbons.

The essential energy-storing molecules in all significant forms of fossil fuels and biofuels are hydrocarbons. They serve as the raw material for making many different kinds of polymers.

Thus, The empirical formula of the hydrocarbon based on these products, CH₄.

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The density of the object in g/cm³ is 3.0  .

Since the one mililiter is equal to one centimeter cube .

The density of the object is determined using the following formula and can be stated numerically as the mass per unit volume .

So, density = mass / volume = g / ml = g / cm³

While any unit of mass and volume can be used to compute density , like grams ( g ) and millilitres  ( ml ) are the most often used units . As a result , density is expressed in grams per millilitre ( g/ml ) . The density is expressed in grams per centimeter cube also .

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Answer:

3.0

Explanation:

Answer:

32 grams

Explanation:

To find the mass of the object, you need to multiply the given volume by the denisty. The denisty ratio compares the mass of an object per every 1 mL. It is important to arrange the denisty ratio in a way that allows for the cancellation of units (mL should be in the denominator). The final answer should have 2 sig figs.

Denisty = 1.35 g/mL

  24 mL                1.35 g
----------------  x  -----------------  =  32.4 g = 32 g (correct sig figs)
                              1 mL

The accurate responses are;

1) it has the configuration of of the noble gas in the same period

2) higher, gain, more

The electron configuration shows the arrangement of the atoms in an element. We know that in an element, the nucleus is at the core of the atom. The shells have energies increasing order with the shells that are close to the nucleus having the lowest energy and the energy of the shells tends to increase radially outwards from the nucleus.

Now let us try to look at sodium. We know that the formation of ions leads an element to attain the noble gas configuration. We can see that when sodium loses an electron, it closely resembles the noble gas neon.

The ionization energy is the energy that is required for the removal of one electron from the outermost shell of the atom. The complete statement therefore is; Ionization energies for nonmetals are higher than metals because they would rather gain  electrons than lose electrons, so it takes more energy.

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The process that completes the way that the the federal budget is created is that executive agencies submit budget requests.

The budget refers to the way in which the expenditure of the government is to be run in the coming year. It is customary that the executive must present their budget to the legislative arm of the government for consideration. It must be noted that the budget that has been drafted by the executive arm of government could only be passed into law by the legislative arm.

It is important to note that the legislative arm of government is composed of both the senate and the congress and the both chambers of the legislature must have to individually pass the appropriation bill before it could be passed into law by the president.

Hence, the process that completes the way that the the federal budget is created is that executive agencies submit budget requests.

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Some examples of synthetic products made from metal ores include, aluminum, cobalt, copper, gold, plastics.

Metal ores are the rocks from which metal is mostly extracted from, usually in a commercial quantity.

Also, metal ores are naturally occurring rocks that contain metals or metal compounds in sufficient amounts to make it worthwhile extracting them.

The method used to extract a given metal from its ore depends upon the reactivity of the metal and so how stable the ore is.

Examples of metal ores;

Thus, some examples of synthetic products made from metal ores include, aluminum, cobalt, copper, gold, plastics.

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175.93m hope this helps

The density of 4.00 mL x 10⁻² mL of bromine (liquid) weighing 0.1249 g is 3.1225 g/mL.

Density of a liquid is defined as the mass of the substance per unit of its volume. Density is equal to the mass divided by the volume of any liquid. It is denoted by a Greek letter ρ. It is given by -

                                               ρ = m

                                                      v

where,

ρ = density

m = mass

v = volume

To calculate the density of bromine liquid,

We use,

         Density =   mass    

                           volume

         Density =  0.1249   g

                         4.00 x 10⁻² mL

         Density = 3.12 g/mL

Therefore, the density of bromine liquid is 3.12 g/mL

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The evidence to explain how advancements in technology influenced cell theory is the invention of microscopes. It has lead the way into the discovery of cells.

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The percent by mass of iron in Prussian blue is 32.6%.

The salt called Prussian blue is a salt that is of the family of the  ferrocyanide salts. They are commonly used as dyes. This compound as it is know could be used as a blue dye in many quarters. In medicine it could be used to assist the body to expedite the elimination of certain elements or harmful chemicals from the body.

We are here mandated to obtain the percent by mass of the iron atom in the Prussian blue;

Molar mass of Prussian blue = 859

Mass of iron in Prussian blue = 5(56) = 280

Percent by mass of Prussian blue =  280/ 859  * 100 = 32.6%

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Answer:

Electrons

Explanation:

Assuming you are talking about the nucleus of an atom, the particles surrounding the nucleus are electrons.

Atoms consist of three subatomic particles: protons, neutrons, and electrons. Protons and neutrons are located within the nucleus, whereas the electrons exist outside of it.

The temperature of the boiling water stop changing as you continue to add heat because all the heat energy is used up in changing water from liquid state to vapor state.

When we heat the water and once water  starts boiling , the heat supplied will be used in state conversion , from liquid to gaseous vapour. in other words, energy added to liquid used into breaking bonds between liquid molecules without changing the temperature.

All the energy provided in the form of heat increases the kinetic energy of particles and temperature does not increase. The boiling point of water depends on atmospheric pressure. At 1 atm the boiling point of water is 100°C.

Hence, The temperature of the boiling water stop changing as you continue to add heat because all the heat energy is used up in changing water from liquid state to vapor state.

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Previously cooked food must reheated to temperatures of at least 165°F.

When food is cooked, it should be eaten and any leftovers preserved.

Leftovers can be preserved by refrigeration.

However, when this refrigerated food is to be eaten again, it should be reheated before eating.

Previously cooked food must be heated to prevent spoilage and poisoning.

The addition of heat will prevent spoilage by:

Previously cooked food must reheated to temperatures of at least 165 °F.
The process of reheating the food may be done in microwave oven or over a stove.

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