which of the following molecules has a shape is trigonal pyramid?

ccl4
ch2o
Nh2o
h2o​

The coefficients needed to balance the equation would be 2, 7, 4, and 6 respectively.

This requires that the number of atoms of each element is the same both on the reactant and product's sides.

Hence, the balanced equation of the reaction becomes:

\(2C_2 H_6 O+ 7O_2 --- > 4CO_2 +6H_2 O\)

Thus, the coefficient for each species would be 2, 7, 4, and 6 respectively.

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HI is the aqueous solution which is the most acidic. Any aqueous solution in chemistry can be divided into one of three groups, including neutral, basic, or acidic solutions.

Any aqueous solution in chemistry can be divided into one of three groups, including neutral, basic, or acidic solutions. Any aqueous solution with a pH 7.0 ([H+] > 1.0 x 10-7 M) is considered an acidic solution.

Water serves as the solvent in an aqueous solution. Solutions that are acidic are sour, whereas alkaline solutions are soapy, thus it's rarely a good idea to try an unfamiliar solution. HI is the aqueous solution which is the most acidic.

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The liquid substance used in the laboratory for dissolving dry mortar on floor flies is hydrochloric acid.

Hydrochloric acid is a strong acid that can dissolve many materials, including dry mortar.

Hydrochloric acid also known as muriatic acid or sulfuric acid, are commonly used to dissolve hardened mortar or concrete residues.

To use hydrochloric acid to dissolve dry mortar, you will need to mix the acid with water in a ratio of 1 part acd to 10 parts water.

You should then apply the mixture to the dry mortar using a brush or spray botle.

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this is how you find it:

23-11=12

the 12 is the amount of neutrons

Answer:

\(\fbox{c = - 4.01 \: joule/g°C}\)

Step by step explanation:

Given:

Mass of given sample (m) = 2.50 g

Initial temperature (T1) = 25°C

Final temperature (T2) = 20°C

Heat Energy Q = 12 cal

To find:

\(Specific \: Heat \: c = \: ?\)

Solution:

We know that,

Specific heat of any substance is directly proportional to the mass and change in temperature.

Represented by equation,

\(Q = mc \triangle T\)

Where,

Q = Heat Energy

m = mass of given sample

c = specific heat

∆T = change in temperature

Substituting corresponding values,

\(Q = mc \triangle T \\ 12 = 2.5\times c \times (20-25) \\ c = \frac{12}{2.5 \times ( - 5)} \\ c = - 0.96 \: cal/g°C \\ \)

We also know that,

\(1 \: cal = 4.184 \: joules\)

multiplying above answer by 4.184,

\(c = - 0.96 \times 4.184 \\ \fbox{c = - 4.01 \: joule/g°C}\)

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Iridium forms metallic bonds, while mercury exhibits a combination of metallic and covalent bonding. These covalent interactions give rise to the low boiling point and weak intermolecular forces in liquid mercury.

Iridium (Ir) and mercury (Hg) exhibit different types of bonding based on their electronic configurations and properties.

Iridium is a transition metal belonging to Group 9 of the periodic table. It has a partially filled d-orbital in its atomic structure, which allows it to form metallic bonds. Metallic bonding occurs when the outer electrons of metal atoms are delocalized and form a "sea" of electrons that are free to move throughout the crystal lattice. This results in the characteristic properties of metals, such as high electrical and thermal conductivity, malleability, and ductility. Iridium forms metallic bonds with other iridium atoms, contributing to its solid, dense, and lustrous nature.

Mercury, on the other hand, is a unique element. It is a transition metal, but it exhibits characteristics of both metallic and covalent bonding. At room temperature, mercury exists as a liquid, which is highly unusual for a metal. This is because mercury atoms have a weak interatomic interaction, known as metallic bonding, similar to other metals. However, due to the presence of unpaired electrons in its 6s orbital, mercury can also form weak covalent bonds. These covalent interactions give rise to the low boiling point and weak intermolecular forces in liquid mercury.

In summary, iridium forms metallic bonds, while mercury exhibits a combination of metallic and covalent bonding.

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Answer:

Increase

Explanation:

More collisions mean more force, so the pressure will increase. When the volume decreases, the pressure increases. This shows that the pressure of a gas is inversely proportional to its volume.

The number of L present in a 10.0 lb sample of a substance with a density of 0.25 g/cm³ is 1.8L.

The volume of a substance can be calculated by dividing the mass by its density as follows:

Volume = mass (g) ÷ density (g/cm³)

According to this question, 10.0 lb sample of a substance has a density of 0.25 g/cm³. The volume can be calculated as follows:

10.0 Ib to grams = 453.59 grams

1 gram/cubic centimetre = 1000 grams/Litre

0.25g/cm³ = 250g/L

Volume of substance = 453.59g ÷ 250g/L

Volume = 1.8L

Therefore, the number of L present in a 10.0 lb sample of a substance with a density of 0.25 g/cm³ is 1.8L.

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Answer:

cannot be measure

Hope this helps :) !!!

Answer:

Explanation:

Here, we want to get the number of moles in 4.25 g of CO

To get the number of moles, we have to divide the mass by the molar mass of CO

Mathematically:

The molar mass of CO is the sum of the atomic masses of carbon and oxygen

The atomic mass of carbon is 12 amu

The atomic mass of oxygen is 16 amu

The molar mass is thus:

Thus, we have the number of moles as:

Answer:

Option 3 and 4

Explanation:

In an endothermic reaction, the potential energy of the system increase. The potential energy of the reactant is less as compared to the potential energy of the products and hence additional energy is required to produce products.

The potential energy of the reactants depend on their chemical state and not the physical state. Hence, option 2 is not correct. Also, the number of reactant do not make any significant impact on the determination of potential energy of reactants. Thus, option 1 is also incorrect

The volume of ammonia would be produced by this reaction 4.56mL of nitrogen were consumed is 9.13 mL of ammonia.

Volume is a unit used to describe how much space a substance or thing takes up. It is a real thing with a physical value that can be measured in liters, milliliters, cubic meters, or cubic centimeters.

The chemical equation for the reaction of nitrogen and hydrogen gases to produce ammonia gas is as follows:

N₂ + 3H₂ → 2NH₃

The balanced equation's stoichiometry states that 2 moles of ammonia are created when 1 mole of nitrogen combines with 3 moles of hydrogen. This indicates that nitrogen and ammonia have a mole ratio of 1:2.

We must first estimate how many moles of nitrogen were reacted in order to calculate the volume of ammonia created. The ideal gas law allows us to do the following:

PV = nRT, where R is the gas constant, n is the number of moles, P is the pressure, V is the volume, and T is the temperature.

We can assume that the pressure is constant and cancel it out because the gases are not contained:

V = nRT/P

The volume of 1 mole of gas is 22.4 L at standard temperature and pressure (STP), which are 0°C and 1 atm. As a result, the amount of nitrogen that reacted was:

n(N2)  = 4.56 mL × (1 L/1000 mL) × (1 mol/22.4 L) × 0.000204 moles.

As nitrogen and ammonia have a mole ratio of 1:2, the amount of ammonia produced is calculated as follows: n(NH₃) = 2 × n(N₂) = 0.000408 moles

In order to calculate the volume of ammonia produced, we can once more utilize the ideal gas law:

V(NH₃) = n(NH₃) × V(molar)= 0.000408 moles × 22.4 L/mol = 0.00913 L.

The amount of ammonia produced, rounded to three significant digits, is 9.13 mL = 0.00913 L. Hence, the answer is: 9.13 mL of ammonia.

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In this letter, express gratitude to your uncle, a university professor, for his invitation and congratulate him on his achievements.

Here are the steps to be followed:

By following these steps, you can write a thoughtful and appreciative letter to your uncle, expressing your gratitude for his invitation and congratulating him on his achievements.

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Answer:

--->

Explanation:

the change of oxygen from solid to liquid would be that at the solid phase the color would be light blue and changes to colorless on the liquid phase

When oxygen transitions from solid to liquid, its colour changes from bright blue in the solid state to colourless in the liquid state.

The periodic table's Group 16 (also known as the oxygen group) contains the nonmetallic chemical element oxygen (O). Oxygen is a colourless, odourless, and tasteless gas that is necessary for all living things. Animals take it up and then change it into carbon dioxide, which plants then use as a source of carbon and release the oxygen back into the atmosphere.

As well as reactions that remove elements from their combinations with one another, oxygen may react with nearly any other element to produce compounds. These reactions, which are frequently accompanied by the development of heat and light, are known as combustions. Water is the most significant component.

Therefore, when oxygen transitions from solid to liquid, its colour changes from bright blue in the solid state to colourless in the liquid state.

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Answer: 1. The empirical formula is \(PNF_2\)  

2. The molecular formula is \(PNF_2\)

Explanation:

If percentage are given then we are taking total mass is 100 grams.

So, the mass of each element is equal to the percentage given.

Mass of P = 37.32 g

Mass of N = 16.88 g

Mass of F = 45.79 g

Step 1 : convert given masses into moles.

Moles of P =\(\frac{\text{ given mass of P}}{\text{ molar mass of P}}= \frac{37.32g}{31g/mole}=1.20moles\)

Moles of N =\(\frac{\text{ given mass of N}}{\text{ molar mass of N}}= \frac{16.88g}{14g/mole}=1.20moles\)

Moles of F =\(\frac{\text{ given mass of F}}{\text{ molar mass of F}}= \frac{45.79g}{19g/mole}=2.41moles\)

Step 2 : For the mole ratio, divide each value of moles by the smallest number of moles calculated.

For P = \(\frac{1.20}{1.20}=1\)

For N = \(\frac{1.20}{1.20}=1\)

For F =\(\frac{2.41}{1.20}=2\)

The ratio of P: N: F= 1: 1: 2  

Hence the empirical formula is \(PNF_2\)

The empirical weight of \(PNF_2\)= 1(31)+1(14)+2(19)= 82.98 g.

The molecular weight = 82.98 g/mole

Now we have to calculate the molecular formula.

\(n=\frac{\text{Molecular weight}}{\text{Equivalent weight}}=\frac{82.98}{82.98}=1\)

The molecular formula will be=\(1\times PNF_2=PNF_2\)

Answer:

See explanation

Explanation:

In this question, we have to follow the IUPAC rules. Lets analyze each compound:

a. 1-methylbutane

In this compound we have a chain of 5 carbons, so the correct name is Pentane.

b. 1,1,3-trimethylhexane

In this compound, we longest chain is made of 7 carbons, so, we have to use the name "heptane". Carbon one would be the closet one to the methyl group, so the correct name is  2,4-dimethylheptane.

c. 5-octyne

In this case, carbon 1 would be the closet one to the triplet bond. With this in mind, the correct name is oct-3-yne.

d. 2-ethyl-1-propanol

In this compound, we longest chain is made of 4 carbons, so, we have to use the name "butane". Carbon one would be the carbon with the "OH" group, so the correct name is  2-methylbutan-1-ol.

e. 2.2-dimethyl-3-butanol

In this case, carbon 1 would be the closet one to the "OH". With this in mind, the correct name is 3,3-dimethylbutan-2-ol.

See figure 1

I hope it helps!

Answer:

antimony-121 has the highest percent natural abundance

Explanation:

percent natural abundance;

121.76 = 120.90 x + 122.90 (1 - x)

121.76 = 120.90 x + 122.90 - 122.90x

121.76 = -2x + 122.90

121.76 - 122.90 = -2x

x= 121.76 - 122.90/ -2

x= 0.57

Where x and 1 - x refers to the relative abundance of each of the isotopes

Percent natural abundance of antimony-121 = 57 %

Percent natural abundance of antimony-123 = (1 - 0.57) = 43%

Let us remember that isotopy refers to a phenomenon in which atoms of the same element have the same atomic number but different mass numbers. This results from differences in the number of neutrons in atoms of the same element.

We can clearly see that antimony-121 has the highest percent natural abundance.

So, the mass of each metal in the 70.5 g mixture is: Magnesium: 39.1 g and Silver: 31.4 g.

A reaction, in chemistry, refers to a process in which one or more substances are transformed into new substances with different physical and/or chemical properties. Chemical reactions involve the breaking and forming of chemical bonds between atoms or molecules, resulting in the rearrangement of atoms to create new substances. In a chemical reaction, the reactants are the starting materials that undergo the chemical change, while the products are the substances that are formed as a result of the reaction. The chemical equation represents the reactants and products of a chemical reaction and is balanced to show the conservation of mass and the law of conservation of energy.

Here,

The balanced chemical equation for the reaction between magnesium and silver nitrate is:

Mg + 2AgNO3 → 2Ag + Mg(NO3)2

From the equation, we can see that 1 mole of magnesium reacts with 2 moles of silver nitrate to produce 2 moles of silver and 1 mole of magnesium nitrate.

First, we need to calculate how much silver was produced in the reaction. From the equation, we can see that 1 mole of magnesium produces 2 moles of silver, so:

1 mol Mg = 2 mol Ag

The molar mass of magnesium is 24.31 g/mol, so the number of moles of magnesium in the sample is:

=17.6 g Mg / 24.31 g/mol

= 0.724 mol Mg

Since 1 mole of magnesium produces 2 moles of silver, the number of moles of silver produced in the reaction is:

=0.724 mol Mg × 2 mol Ag / 1 mol Mg

= 1.448 mol Ag

The molar mass of silver is 107.87 g/mol, so the mass of silver produced in the reaction is:

=1.448 mol Ag × 107.87 g/mol

= 156.0 g Ag

Now, we can calculate the mass of magnesium that reacted in the reaction:

=17.6 g Mg × (156.0 g Ag / 70.5 g total metal)

= 39.1 g Mg

Therefore, the mass of silver in the 70.5 g mixture is:

=70.5 g total metal - 39.1 g Mg

= 31.4 g Ag

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Answer:

Explanation:

In theory, not much of anything. The vast majority of nitrates are water soluble. Aside, not sure what chemistry level you are at but you will probably be asked to know or memorize some solubility rules. This, for lack of a better phrase, Nitrate rule, is near spot on. With one exception—a rare one—all metal cationic nitrates are soluble in water. All of them. So, assuming you are talking about aqueous, water-based solutions of these salts and mixing them together, I expect nothing to occur. Both solutions, I believe are colorless in water and will thus remain so. If you had say a solution of Iron (III) nitrate and copper (II) nitrate, slightly different story. Both are colorful solutions and I would think you might see blending of colors but no reaction; no precipitate will form. You will probably learn about markers of a chemical reaction. One of these is a color change. Note, you should read this as a change of color from what you previously had. Going from red to blue or colorless to colored (or vice versa) is a strong indication of a reaction (e. g. evidence of bond-breaking and bond-formation). The mere mixing of colors does not constitute a chemical reaction.

Answer:

3–heptene or Hept–3–ene.

Explanation:

To name the compound given in the question above, we must determine the following:

1. Identify the functional group of the compound.

2. Locate the longest continuous carbon chain. This gives the parent name of the compound.

3. Identify the substituent group attached to the compound.

4. Locate the position of the double bond (i.e the functional group) by giving it the lowest possible count.

5. Combine the above to obtain the name of the compound.

Now, we shall obtain the name of the compound as follow:

1. The compound contains double bond. Hence the compound is an alkene.

2. The longest continuous carbon chain is 7 i.e heptene.

3. No substituent group is attached to the compound.

4. The double bond is located at carbon 3 since counting from the right gives the lowest count for the double bond.

5. The name of the compound is:

3–heptene or Hept–3–ene

The second one is B (2-hexyne)

Answer:

Unlike other extinguishing agents - water, dry chemical, CO2, etc., a stable aqueous foam can extinguish a flammable or combustible liquid fire by the combined mechanisms of cooling, separating the flame/ignition source from the product surface, suppressing vapors and smothering. It can also secure for extended periods of time against reflash or reignition. Water, if used on a standard hydrocarbon fuel, is heavier than most of those liquids and if applied directly to the fuel surface, will sink to the bottom having little or no effect on extinguishment or vapor suppression. If the liquid fuel heats above 212ºF, the water may boil below the fuel surface throwing the fuel out of the contained area and spreading the fire. For this reason, foam is the primary fire-extinguishing agent for all potential hazards or areas where flammable liquids are transported, processed, stored or used as an energy source.

this is what I found, hope it helps

In contrast to other extinguishing agents such as water, dry chemical, CO2, and so on, a stable aqueous foam can extinguish a flammable or combustible liquid fire through a combination of cooling, separating the flame source from the product surface, suppressing vapors, and smothering.

The term solubility is defined as the maximum amount of a substance that will dissolve in a given amount of solvent at a specified temperature.

It can also protect against ref lash or reignition for extended periods of time. Water is heavier than most liquids when used on a standard hydrocarbon fuel and will sink to the bottom if applied directly to the fuel surface, having little or no effect on extinguishment or vapor suppression.

If the liquid fuel heats above 212°F, water may boil beneath the fuel surface, releasing the fuel and spreading the fire.

Thus,  dry chemical, CO2, and so on, a stable aqueous foam can extinguish a flammable or combustible liquid fire through a combination of cooling.

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Ancef (Cefazolin) is a first-generation cephalosporin antibiotic that is used to treat bacterial infections. Cefazolin is available in several formulations, including injectable, intravenous, and powder for injection.

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Answer:

wdym?

Explanation:

The amount of potassium permanganate (KMnO4) in the volumetric pipette and the 100 ml solution is the same.

When a volumetric pipette is used to take 10 ml of the stock solution, it is designed to deliver an accurate volume of liquid, ensuring that the amount of solute (KMnO4) is accurately transferred to the flask. By adding water to the volumetric flask to make a more dilute solution, the total amount of solute (KMnO4) remains the same, but it is now distributed throughout the larger volume of the flask.

Therefore, there is no more or less KMnO4 in the volumetric pipette or the 100 ml solution. Both contain the same amount of KMnO4, which was accurately transferred using the volumetric pipette. It is important to note that accuracy in transferring the correct volume is critical in ensuring that the concentration of the diluted solution is correct.

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An air bubble in your pipette while collecting 15.0 mL of your copper sulfate solution. You ignore the air bubble and carry on with making your solution by then adding 100-mL of DI water then low volume transfer, thus altering the concentration of reaction mixes leading to failed experiments.

Air bubbles can form when gaseous gas is present in the liquids used in the experiment. This is particularly true when the liquids are heated during the experiments.

They result in incorrect dosing because the system believes the bubble is titrant and produces falsely high results. Furthermore, different sized air bubbles cause result variation.

Thus, altering the concentration of reaction mixes leading to failed experiments.

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A student sets up the investigation shown below. The movement of colored water through the gravel best models groundwater.

Groundwater is water that is located beneath the surface of the Earth in soil pore spaces and in the fractures of rock formations. It originates from precipitation that percolates into the soil and moves downward to the water table, which is the boundary between the unsaturated and saturated zones of soil.

Groundwater can be a major source of drinking water and is also used for irrigation, industry, and other purposes. It can be accessed through wells drilled into the ground, and it often moves very slowly through the subsurface, sometimes taking decades or even centuries to replenish.

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The complete question:

A student sets up the investigation shown below. The movement of colored water through the gravel best models —

The reaction order and specific reaction rate constant can be determined by performing the kinetics experiment on irreversible polymerization A. Kinetic experiments can be used to investigate the rate and mechanism of chemical reactions. Chemical kinetics is the study of chemical reactions' speed and pathway.

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Answer:

one to two inches (three to five centimeters) per year.

Explanation:

Answer:

1 to 2 inches (3 to 5 centimeters) per year

Explanation:

It depends on what plates your talking about, but in general, they move apart anywhere from 1 to 2 inches (3 to 5 centimeters) per year.

Specifically, though, The Arctic Ridge has the slowest rate (less than 2.5 cm/yr), and the East Pacific Rise near Easter Island, in the South Pacific about 3,400 km west of Chile, has the fastest rate (more than 15 cm/yr).

Answer:

It describes the idea that the number and kinds of atoms present before and after a chemical reaction remain constant.

Explanation:

This one best describes it.

you can't really see the conservation of energy and describe it.

it is not the basic principle for chem solutions, there are tons.

mass in a chemical rxn always changes.

thus, best option is the last one.