nf3nf3 draw the molecule by placing atoms on the grid and connecting them with bonds. include all lone pairs of electrons.

First, let's remember the formula to calculate an object's density:

Then, we analyze what we have:

We need to determine the volume, so we transform our formula like this:

We replace our data:

Then, the answer is that the volume equals 12.4 cm^3.

Answer:

planets,meteoroids and asteroids  

Explanation:

The mass of water produced if the percent yield of the reaction is 72% is 16.2g.

Mass of acetylene = 40.0 grams

Mass of oxygen = 40.0 grams

Percent yield of the reaction = 72%

The balanced chemical equation is : 2 C2H2(g) + 5 O2(g) → 4 CO2(g) + 2 H2O(g)

From the balanced chemical equation, it is clear that 2 moles of acetylene reacts with 5 moles of oxygen to form 2 moles of water.

To find out limiting reagent

Moles of acetylene = Given mass of acetylene / molar mass of acetylene

                                 = 40.0 g / 26 g/mol = 1.54 moles

Moles of oxygen = Given mass of oxygen / molar mass of oxygen

                                = 40.0 g / 32 g/mol = 1.25 moles

The limiting reactant is oxygen because its number of moles is less than acetylene. Oxygen will react with 1.25 moles of acetylene present and form CO2 and H2O.

According to the balanced equation, the stoichiometric ratio of C2H2 to H2O is 2:2, meaning that for every 2 moles of C2H2, 2 moles of H2O are produced.

Since the stoichiometry is 1:1, the moles of water produced will be the same as the moles of acetylene used.

The number of moles of H2O produced 1.25 moles.

The mass of H2O produced = Number of moles of H2O × Molar mass of H2O

Mass of H2O produced = 1.25 × 18 = 22.5 g

Given percent yield = 72%

The actual yield can be calculated as follows;

Percent yield = Actual yield / Theoretical yield × 100

72% = Actual yield / 22.5 g × 100

Actual yield = 22.5 g× 72 / 100 =16.2 g

Thus, the mass of water produced if the percent yield of the reaction is 72% is 16.2g.

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In an aqueous solution, water molecules associate with one another through hydrogen bonding.

Hydrogen bonding occurs when the hydrogen atom in one water molecule is attracted to the electronegative oxygen atom of another water molecule. This interaction leads to the formation of a network of hydrogen bonds between water molecules, resulting in the cohesive and adhesive properties of water. Hydrogen bonding is responsible for many of the unique properties of water, such as its high boiling point, high specific heat capacity, and surface tension.

Hydrogen bonding plays a crucial role in many of the unique properties of water. It gives water a relatively high boiling point, which allows it to exist as a liquid over a wide range of temperatures. Additionally, hydrogen bonding contributes to water's high specific heat capacity (the amount of heat energy required to raise its temperature) and its high surface tension.

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The chemical equation for Direct Combination of Cobalt (III) and nitrogen, with the product given can be represented as given : Cobalt (III) + nitrogen → Cobalt nitride (Co3N2)When Cobalt (III) and nitrogen are combined using direct combination method, the product formed is Cobalt nitride (Co3N2).

The balanced chemical equation for this reaction is shown below.2 Co (III) + 3 N2 → Co3N2.Cobalt nitride is a blackish gray powder with a melting point of 1750 °C and a density of 6.5 g/cm3. Cobalt nitride is an important metal nitride that is used in the preparation of cobalt metal catalysts, magnetic alloys, and other materials.

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According to the information of the graph we can infer that if the water were cooled to 5°C the reaction time would be close to 30 seconds.

To establish what would the reaction time be if the water were cooled to 5°C we have to analyze the information of the graph specially the trend. In this case, we have to take into account where are located the point that relate time and temperature.

In this case, the trend is more time with less temperature. So if the water were colled to 5°C, the time would be close to 30 seconds.

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Answer:

1

Explanation:

Molarity is simply defined as the mole of solute per unit litre of water. Mathematically, it can be expressed as:

\(Molarity = \frac{mole}{volume}\)

With the above information in mind, we can obtain the molarity of the hydrochloric acid solution as follow:

Mole of HCl = 3 moles

Volume of water = 3 L

\(Molarity = \frac{mole}{volume}\\Molarity = \frac{3}{3}\\Molarity = 1 M\)

Therefore, the molarity of the hydrochloric acid solution is 1 M.

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Answer:

volume problem

Explanation:

cubic usually means volume

Answer:

B: Radiant

Explanation:

E2021...I got you guys

Answer:

radiant

Explanation:

Answer:

flower

Explanation:

Answer: As we know that atoms are the building block of the universe and so it is very important to know about the structure of atom so that we can understand and explain the matter, properties of matter and reaction/change between matter and atomic theory is one of the step to understand matter that taken by chemist and physicist

Answer:

They are already matched for you. It goes

1.

2.

3.

in the order of the questions.

Using smaller pieces of coal and increasing the concentration of oxygen can both increase the rate of the exothermic combustion reaction of coal. The correct answer is d. both (a) and (b) are correct.

When coal is broken down into smaller pieces, it increases the surface area available for the reaction. This allows for more contact between the coal and oxygen, promoting faster and more efficient combustion. The increased surface area facilitates the exposure of more coal particles to the surrounding oxygen, leading to a higher frequency of successful collisions between reactant molecules and an overall increase in the reaction rate. Similarly, increasing the concentration of oxygen provides a higher number of oxygen molecules available for the combustion reaction. This higher concentration promotes more frequent collisions between oxygen and coal particles, resulting in an accelerated reaction rate. Lowering the temperature, as mentioned in option (c), would not increase the rate of the reaction. Generally, increasing the temperature enhances reaction rates for exothermic reactions. Therefore, the correct answer is option d, as both using smaller pieces of coal (increased surface area) and increasing the concentration of oxygen can effectively increase the rate of the exothermic combustion of coal.

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Answer:

H2O < NH3 < CCl4 < BCl3

Explanation:

Bond angle of a molecule or an ion can be explained by two concepts which are either by their valence shell electron pair repulsion (VSEPR) model or hybridization.

The VSEPR model  determines the total number of electron pairs surrounding the central atom of the species. All the electron pairs will orient themselves in such a way as to minimize the electrostatic repulsions between them. These repulsions hence determine the geometry of the covalent bond angles around the central atom.

Hence; as the number of lone pairs increases from zero to 2 the bond angles diminish progressively.

Hybridization is the mixing and blending of two or more pure atomic orbitals to form two or moe hybrid atomic orbitals which are identical in shape and energy. During the process of formation of these hybrid orbitals, The bonds formed i.e the sigma bond and the pi bond determines the bond angle of such compound.

From the given compounds;

H20 have a bond angle of 104.5°

NH3 have a bond angle of 107°

BCl3 have a bond angle of 120°

CCl4 have a bond angle of 109.5°

thus in an increasing order of bond angle:

H2O < NH3 < CCl4 < BCl3

The spines spear food and protect an urchin from predators.

From the skull base to the tailbone, there are bones, muscles, tendons, and other tissues. The fluid around the spinal cord and the spinal cord itself are enclosed by the spine. known by the names vertebral column, spinal column, and backbone. a strong, slender, sharp-pointed structure that resembles a modified leaf or stipule (a stipule is an appendage located at the base of a petiole, or at the base of a leaf's stalk). A pointy growth from the skin or bark is referred to as a. Thorns are modified stems that are stiff, woody, and have a sharp point. Cervical, thoracic, and lumbar spines are the three primary segments of the spine. Seven vertebrae make up the cervical, which is the top portion of the spine (bones). Centered in the body is the thoracic.

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The change in pressure or difference here is  due to the changes in air density  since air density is related to temperature, the Warm air is less dense  compare to cooler air, in getting  wind there needs to be a pressure gradient,  so that there will be higher pressure than the other. Wind will then start blowing from the high pressure to the low pressure.

One side will have a higher pressure compare to the other  ans this can be attributed to how the wind requires a pressure gradient then wind will begin to blow from the area of high pressure to that of low pressure.

It should be noted that the density and temperature of air masses are two factors that affect changes in air pressure.

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The description of the molecular polarity and the intermolecular forces present in ammonium lauryl sulfate should be explained below.

The common name of it should be likely ammonium lauryl sulfate (ALS)  and its molecular formula should be  (CH3(CH2)10CH2OSO3NH4).

Also, one intermolecular formula that should be presented in the molecule should be considered as the electrostatic forces of attraction that lies between the non-polar chain and the polar ending group.

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Answer:

uhm I think it would be letter C. 0.589

The molecular solids can not expand to conduct electricity because there are small distances between the atoms and also their bonds are very strong, both characteristics make the movement of particles very small (they only vibrate in place), and that also causes the electrons to be attracted to the atoms with greater force and therefore they do not move easily.

Answer:

A new element

Explanation:

As you add mopre and more protons and electrons and neutrons it keeps on crating new.

Answer:

Either the first one or the third one.

Explanation:

Using process of elimination: knowing that the controlled variable is something the conductor is able to control and stays the same throughout; the amount of water is the same, but it also states that temperature is not the same throughout. This cancels out B because the amount of sugar dissolved varies and doesn’t stay the same. D fits the same criteria as well.

so now we are left with A and C.

An independent variable is something that can be by itself and doesn’t depend on anything else. Sugar is NOT independent, as it dissolves DEPENDING on the amount of liquid. So we can already rule out that sugar is a dependent variable. Both A and C have those choices though, so now we are with the control group and the independent variable.

Think about it, which is the independent variable? Water amount doesn’t depend on anything, while the temperature depends on the room. So the answer is most likely A.

Hope this helps, don’t stress about homework. Happy Holidays!

A represents the central atom, X represents the terminal atom, E represents the non-bonding electron group (usually lone pairs), and n represents the number of bonding electron pairs.

We describe each term as follows:

A: Central atom represents the atom in the center of the molecule to which other atoms are bonded.

X: Terminal atom represents the atoms bonded to the central atom.

E: Non-bonding electron group represents the valence electron group that is not involved in bonding and usually exists as lone pairs on the central atom.

n: Number of bonding electron pairs represents the number of pairs of electrons shared between the central atom and the terminal atoms.

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Answer:

Atomic size decreases from left to right in the Periodic Table.

Explanation:

s you move from left to right, the nucleus gains protons.

This increases the positive charge of the nucleus and its attractive force on the electrons.

At the same time, electrons are added to the atoms as you move from left to right across a period.

These electrons reside in the same energy shell and do not offer complete shielding.

The effect of the increasing proton number is greater than that of the increasing electron number.

As a result, the valence electrons are held closer to the nucleus, and the atomic radius decreases.

Answer: The color of pH paper with milk at its isoelectric point is typically neutral, which means it may not show any significant color change.

Explanation:

At the isoelectric point, pH paper with milk would show a neutral color. This occurs because the isoelectric point is the pH at which a molecule, such as a protein, has no net charge. In the case of milk, the proteins present, such as casein, have a specific isoelectric point around pH 6.6. At this pH, the positively and negatively charged groups on the protein molecules are balanced, resulting in no overall charge.

pH paper is designed to undergo a color change in response to different levels of acidity or alkalinity. However, since the isoelectric point of milk is close to neutral pH, the pH paper will not display a significant color change. It will likely remain close to its original color, indicating a neutral pH reading.

Therefore, when using pH paper with milk at its isoelectric point, the absence of a distinct color change reflects the balanced charge of the proteins, resulting in a virtual pH paper reading of neutral.

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Molar mass

No of moles

Volume

Answer:

c) The natural home or environment of an animal, plant, or other organism

Explanation:

Please note that in order to post questions in Science, you must post in Science section, but not in History. You are asking a wrong question in the wrong section.

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Answer: Yes it is. Rust would be considered a chemical reaction because it changes the chemical makeup of the metal.

Explanation:

Answer:

Yes

Explanation:

Rusting is an example of a chemical reaction because it creates a new product. When iron reacts with oxygen (rusting) it becomes Iron (III) oxide.