6.755 mol Pb(SO4)2
How many atoms

Answer:

molecules P4O10 = 2.546 E22 molecules

Explanation:

∴ mass P4O10 = 12 g

∴ mm P4O10 = 283.886 g/mol

⇒ mol P4O10 = (12 g)×( mol/283.886 g) = 0.0423 mol P4O10

⇒ molecules P4O10 = (0.0423 mol P4O10)×(6.022 E23 molecules/mol)

⇒ molecules P4O10 = 2.546 E22 molecules

Elements in group 2 have similar chemical properties due to the same number of valence electrons.

Explanation:

These are also known as alkaline earth metals. The Group 2 elements are 6 in number. This is the second most reactive elements after the alkali metals of group1.

These are group 2 elements because they contain 2 electrons in their valence shell.

They can easily form compounds by ionic bonds.

The elements in Group 2 have similar chemical properties because they have the same number of valence electrons in their atomic structure.

The elements in Group 2, also known as the alkaline earth metals, have similar chemical properties due to their atomic structure. Each element in Group 2 has two valence electrons in its outermost energy level. This similarity in valence electron configuration means that these elements have similar tendencies to lose two electrons and form +2 ions. For example, beryllium, magnesium, and calcium all readily form +2 ions by losing their two valence electrons. This similarity in chemical properties is due to the fact that elements in the same group have the same number of valence electrons.

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Answer:1 mole Li2O

Explanation: Solution attached

First balance the given chemical equation

4 Li + O2 => 2 Li2O

The stoichiometric factor of Li and Li2O is 4 moles Li and 2 moles Li2O

Solution:

2 moles Li x 2 moles Li2O / 4 moles Li

= 1 mole Li2O

Explanation:

Answer: D

Explanation:

Without additional context, it is difficult to determine which supernatural element is emphasized. In literature, each element typically has a distinct significance that contributes to the plot's development.

To ascertain which supernatural element is emphasized, we need additional context from the text or material being discussed. Generally, in literature, supernatural elements like ghosts, prophecies, goblins, and angels serve to create a sense of mystery or to advance the plot. Each element has its own typical significance: a ghost might represent unresolved issues from the past, a prophecy could foreshadow future events, a goblin often adds a touch of mischief or terror, and an angel could symbolize guidance or protection.

Answer:

n= -13

Explanation:

-22 = -9 + n

first flip the equation

n + -9 = -22

then add 9 beacuse we need to do the opposite to find n

so -22 + -9 = - 13

so n = -13

plz mark brainliest i just need 1 more plz plz plz!

Answer:

c.

Explanation:

When the temperature of a gas increases by 4x, its volume will increase according to option A, by 4x as per Charles's law. Thus, correct option is A.

If the pressure of a gas is decreased by 4x, the volume will increase as per option A, by 4x as per Boyle's Law. Thus, correct option is A.

According to the ideal gas law (PV = nRT), when the temperature of a gas is increased, keeping other factors constant, its volume also increases proportionally. This is known as Charles's law. So, if the temperature is increased by 4 times, the volume will increase by 4 times as well.

Similarly, according to Boyle's law, when pressure decreases, volume increases proportionally. So, if the pressure is decreased by 4 times, the volume will increase by 4 times.

Therefore, the correct answers are A for both scenarios.

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Final answer:

Both acetaldehyde and butanoic acid contain a carbonyl group (C=O), which is their similarity. Acetaldehyde is an aldehyde with the carbonyl group bonded to a hydrogen atom, and butanoic acid is a carboxylic acid with the carbonyl group bonded to an -OH group.

Explanation:

The question regarding acetaldehyde and butanoic acid pertains to the similarity of their functional groups. Both acetaldehyde and butanoic acid contain the carbonyl group (C=O). However, acetaldehyde is an aldehyde with the carbonyl group bonded to at least one hydrogen atom, giving it the formula CH3CHO, while butanoic acid is a carboxylic acid where the carbonyl group is bonded to an -OH group, giving it the formula C3H7COOH. Where they must have the same is in having the carbonyl group. Acetaldehyde acts as a starting material in the synthesis of many other organic compounds and occurs naturally in various foods; it also forms in the body during the metabolism of alcohol. On the other hand, butanoic acid has an unpleasant smell and is found in butter and animal fats. While both compounds are functionally different, their similar characteristic lies in the presence of the carbonyl group.

Acetaldehyde and butanoic acid both have a carbonyl group (C=O) in their structure.

Acetaldehyde and butanoic acid must have the same type of functional group known as the carbonyl group, which is denoted as C=O.

In acetaldehyde, the structure is CH₃CHO, where the carbonyl group is bonded to a hydrogen atom and a methyl group (CH₃). Butanoic acid, with the structure CH₃CH₂CH₂COOH, also contains a carbonyl group, but in this case, it is bonded to a hydroxyl group (OH) on the same carbon atom, characterizing it as a carboxylic acid.

The presence of the carbonyl group in both compounds facilitates similar reactions, such as the ability to form hydrates by adding water. This commonality is essential in understanding the fundamental properties and reactions of organic compounds in chemistry.

A molecule of a compound is composed of at least two types of atoms.

Explanation:

A molecule is defined as when two or more atoms of an element combine together by the bonds by sharing the electrons as O^2 (oxygen molecule)

A compound is a molecule when two different types of atom joined by chemical bonds as covalent, ionic or coordinate bonds as NH^3 ( ammonia)

Answer:

C- A molecule of a compound is composed of at least two types of atoms

Explanation:

just did the quiz

Answer:

Explanation:To convert from cal/(g*C) to J/(kg*K), we just need to find a conversion factor for specific heat. There is really no mathematical way to do this other than to look in a physics or chemistry book and find a conversion factor. After doing this, you will see that 1 cal/(g*C) is equal to 4,186 J/(kg*K).

To find the specific heat of a material, first look at the units. There is energy per unit mass per unit temperature. So if we are given an amount of energy appllied to an object, its mass and how much the temperature of the object rises, we can calculate its specifc heat by dividing the energy by both the mass and the temperature, but don't forget to keep the units as they are:

Specific heat of the metal = (95 cal)/(10 K * 700g) = 0.014 cal/(g*K)

To find how much energy it requires to melt 250 grams of ice, we will need what is called the Latent Heat of Melting for ice. This is the amount of heat required to change unit mass of a solid into unit mass of a liquid at a constant temperature. Again, using a reference, the latent heat of melting for ice is found to be 334 kJ/kg. So the energy required to melt one kg of ice is 334 kJ. The amount of energy required to melt 0.250 kg of ice is then:

334 * 0.250 = 83.5 kJ

Answer:A. Negative B. Positive C. Neutral or 0

Explanation: Electrons carries a negative charge and protons are apositively charge subatomic particles. Neutrons exhibits a neutral or 0 charge.

It shows how many atoms are in a element

A chemical formula shows you what a substance was made from. So like what elements are in it, and how many atoms of each element are in it.

For example: H20 has 2 atoms of hydrogen and 1 atom of oxygen.

Happy to help! :)

The amount of sugar in the milk chocolate bar, when reduced from 11.630 g to 4.000 g, would be approximately 3999 mg, assuming the sugar content scales directly with the weight of the chocolate bar.

To determine the amount of sugar in milligrams when the size of the milk chocolate bar is reduced from 11.630 g to 4.000 g, we must understand that the question implicitly suggests a direct relationship between the chocolate bar's weight and its sugar content. Assuming the sugar content scales directly with the weight, we can use a proportion based on the known values, while ensuring that our final answer is expressed in milligrams (mg) and to four significant figures.

First, we need the original sugar content in milligrams for the 11.630 g chocolate bar. Without this specific information, let's assume that the entire mass is sugar for demonstration purposes: 11.630 g equals 11630 mg (since 1 g = 1000 mg). If the bar is reduced to 4.000 g and the sugar scales directly, the amount of sugar in the reduced bar can be calculated as follows:

Answer:

a

Explanation:

a

A)Models make systems more complicated and easier to learn.

Answer:

This time, a hot metal spoon is put in room-temperature water.

Explanation:

The faster-moving atoms in the spoon contact the slower-moving molecules in the water. The atoms in the spoon transfer some of their energy to the molecules in the water. The spoon will get cooler and the water will get a little warmer.

Answer:

This time, a hot metal spoon is put in room-temperature water. The faster-moving atoms in the spoon contact the slower-moving molecules in the water. The atoms in the spoon transfer some of their energy to the molecules in the water. The spoon will get cooler and the water will get a little warmer.

Edit: this is what i think

Answer:

It would be A, B, and C.

Explanation: This is because radio waves are the longest and gamma rays are the shortest wavelengths. Visible light is in between infrared and ultraviolet rays.

Answer: [tex]2.9(10)^{7} ft[/tex]

Explanation:

Firstly we need to know that [tex]1 km=3280.84 ft[/tex], then we cam make the conversion:

[tex]8848 km \frac{3280.84 ft}{1 km}=29,028,872.32 ft[/tex] This is the height of Mount Everest in feet

However, we can express it using scientific notation by counting to the left the decimal spaces:

[tex]29,028,872.32 ft \approx 2.9(10)^{7} ft[/tex]

Answer:

Mass = 27.4 g

Explanation:

Given data:

Mass of sulfur = 15.7 g

Mass of iron = ?

Solution:

Chemical equation:

Fe + S →  FeS

Number of moles of sulfur:

Number of moles = 15.7 g/32 g/mol

Number of moles = 0.49 mol

Now we will compare the moles of sulfur with iron

                  S         :        Fe

                  1          :         1

               0.49      :         0.49

Mass of iron:

Mass = number of moles  × molar mass

Mass = 0.49 mol× 55.85 g/mol

Mass = 27.4 g

Answer:

even though I am missing the question I believe that the correct answer to the question is; his cats will be brown (Dominant)

Explanation:

this statement is true to the fact that on of his cats has the homozygous dominant gene BB. For their to be a chance of a white cat as an offspring both cats would either have to be Hetrozygous (Bb) or Homozygous recesssive (bb)

Answer:

3333333333333337ysh

After reaction, 20cm3 of oxygen will be left and 20cm3 of carbon dioxide will be produced. 12.5cm3 of 0.100 mol/dm3 copper(II) sulfate solution is required to react completely with a solution containing 0.0250 mol of sodium hydroxide.

In the experiment, 10cm3 of ethene (C2H4) was burnt in 50cm3 of oxygen. According to the equation (C2H4 + 3O2 = 2CO2 + 2H2O), every one molecule of ethene reacts with three molecules of oxygen to produce two molecules of carbon dioxide (CO2) and two molecules of water (H2O). As ethene and oxygen are both gases, we can apply the concept of stoichiometry in gases, and say that one volume of ethene will react with three volumes of oxygen, and produce two volumes of carbon dioxide. So, when 10cm3 of ethene burn, it will require 30cm3 of oxygen and produce 20cm3 of carbon dioxide. Hence, the remaining volume of oxygen is 50cm3 - 30cm3 = 20cm3 of oxygen.

As for the second problem, since one molecule of copper(II) sulfate (CuSO4) reacts with two molecules of sodium hydroxide (NaOH) according to the equation (CuSO4 + 2NaOH = Cu(OH)2 + Na2SO4), 0.0250 mol of NaOH would react with 0.0250 / 2 = 0.0125 mol of CuSO4. In terms of volume, that's 0.0125 mol * 1000cm3/mol = 12.5cm3 of 0.100 mol/dm3 copper(II) sulfate solution.

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Answer:

                     Mass of K₂SO₄  =  12.633 g

Explanation:

                    The balance chemical equation for given reaction is as;

                                     CaSO₄ + 2 K = K₂SO₄ + Ca

To solve this reaction one should first find the limiting reagent. To do so e will calculate the moles of each reactant as,

Moles of CaSO₄  =  Given Mass / M.Mass of CaSO₄

Moles of CaSO₄  =  9.87 g / 136.14 g/mol

Moles of CaSO₄  =  0.0725 moles

Similarly for K,

Moles of K  =  Given Mass / A.Mass of K

Moles of K  =  12.05 g / 39.10 g/mol

Moles of K  =  0.308 moles

Now, according to equation,

             1 mole of CaSO₄ reacts with  =  2 moles of K

So,

         0.0725 moles of CaSO₄ will react with  =  X moles of K

Solving for X,

                     X  =  0.0725 moles × 2 moles / 1 mole

                      X  =  0.145 moles of K

As calculated above, we are provided with 0.308 moles of K while, we require only 0.145 moles of it so it means that K is in excess and CaSO₄ is the limiting reagent hence, CaSO₄ will control the yield of K₂SO₄.

So,

The amount of K₂SO₄ produced is calculated by first finding its moles as,

According to equation,

             1 mole of CaSO₄ produced  =  1 mole of K₂SO₄

So,

         0.0725 moles of CaSO₄ will produce  =  X moles of K₂SO₄

Solving for X,

                     X  =  0.0725 moles × 1 mole / 1 mole

                      X  =  0.0725 moles of K₂SO₄

Now convert moles of K₂SO₄ to mass as,

Mass of K₂SO₄  =  Moles × M.Mass

Mass of K₂SO₄  =  0.0725 × 174.26 g/mol

Mass of K₂SO₄  =  12.633 g

Answer:

it is b

Explanation:

Answer: atomic number Z, gives the proton number of an element and it is unique for all elements ( i.e no two elements have the same atomic number or proton number) if the atom of the element is electrically neutral, the atomic number can also be the electron number

Explanation:

Answer:

A, tho I'm not completely sure.

Maybe this will help (picture)

D orbitals start getting filled after the s orbital of the next highest energy level. This is due to the Aufbau principle which mandates that orbitals are filled in order of increasing energy levels. Even if 4s has a higher quantum number than 3d, it gets filled first due to its lower energy.

In atomic structure, d orbitals start getting filled after the s orbital of the next highest energy level. Each energy level in an atom has different types of orbitals - s, p, d, and f. The filling of these orbitals follows the Aufbau principle which means 'building up' in German. This principle essentially mandates that electrons fill up orbitals in order to increase energy levels.

The order of filling starts with the 1s orbital, then 2s, 2p, 3s, 3p, 4s and then the 3d orbitals. Thus, before the d orbitals start getting filled up, the s orbital of the next higher energy level (4s in this case) gets filled. It's important to note that despite 4s having a higher principal quantum number (n=4) than 3d (n=3), 4s has a lower energy and fills up before 3d.

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Answer:

1. Potential energy

2. Chemical energy

3. Electromagnetic energy

4. Kinetic energy

Answer:

1) potential energy 2) chemical energy 3) electromagnetic energy 4) kinetic energy

Explanation:

Just completed this question on my assignment. :)

Answer:

Molecular oxygen and Hydrogen fluoride.

Explanation:

Definition:

Hydrogen bonding:

It is a type of dipole-dipole attraction between the hydrogen atom and more electronegative atoms.

In hydrogen bonding mostly the highly electronegative atoms are fluorine, nitrogen and oxygen.

Explanation:

In given compound such as methane CH₄ the electronegativity of carbon is 2.55 while that of hydrogen is 2.2 so there is smaller electronegativity difference that's why it can not form hydrogen bond.

In case of molecular oxygen the electronegativite atom oxygen is present. It can form hydrogen bonds with water. its electronegativity is 3.44.

In case of hydrogen fluoride the electronegativity atom fluorine is present. It will form hydrogen bonds with water. Its electronegativity is 3.98. So it is more likely to take part in hydrogen bonding.

Answer:

The atmosphere

Explanation:

study island

Answer:

reactivity

Explanation:

Answer:

reactivity is the answer

Explanation:

Option B

Primary productivity is not limited by time

Explanation:

To ecosystems, the productivity of the primary producers is essential because certain bodies generate energy for different existence bodies. Besides the era, primary production ends in the extension of dissimilar plant biomass to the practice. Consumers acquire their strength from primary producers, unless directly (herbivores, any detritivores), or diffusely.

It depends superimposed on the availability of the sunlight, availability of the nutrients such as nitrogen, iron, phosphorus from the soil and water. The primary productivity of the plant's distinct autotrophs is not restricted by time.

Answer:

its b i did the test

Explanation: