I will mark brainlist please help

1) What is the concentration of a solution that contains 6 moles of solute in 2 liters of solution

• 6M

• 12M

• 7M

• 3M


2) what is the number of moles of solute in 250 mL of a 0.4M solution?

• 0.1 mol

• 0.16 mol

• 0.62 mol

• 1.6 mol


3) the molality of a solution containing 8.1 moles of solute in 4847 g of solvent is

• 39m

• 1.7m

• 0.17m

• 598m


4) which of the following is unchanged when a solution is diluted by addition of solvent?

• volume of solvent

• mass of solvent

• number of moles of solute

• molarity of solution

The substance is ethylene glycol.

The term density is the ratio of mass to volume. We have two substances here which are ethanol and ethylene glycol. We have the mass of the solution as shown in the image in question 7 in the attachment to the question.

Mass of the solution = 381 - 250 = 131 g

Volume of the solution = 4 fl oz

1mL= 0.0338 fl

x = 4 fl oz

x =4 fl oz*  1mL/0.0338 fl oz

x = 118.34 mL

Density = mass/volume =  131 g/118.34 mL = 1.11 g/mL

The substance is ethylene glycol.

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Answer:

1. 57.5%

2. 27.89 g

Explanation:

1. Determination of the percentage of sodium in sodium hydroxide.

Molar mass of NaOH = 23 + 16 + 1 = 40 g/mol

Mass of Na in NaOH = 23 g

Percentage of Na = mass of Na / Molar mass of NaOH × 100

Percentage of Na = 23/40 × 100

Percentage of Na = 57.5%

2. Determination of the mass of sodium in 48.5 g of sodium hydroxide.

Molar mass of NaOH = 23 + 16 + 1 = 40 g/mol

Mass of Na in NaOH = 23 g

Total mass of NaOH = 48.5 g

Mass composition of Na = mass of Na / Molar mass of NaOH × Total mass

Mass composition of Na = 23/40 × 48.5

Mass composition of Na = 27.89 g

57.5% is the per cent of sodium in sodium hydroxide.

27.89 g of sodium are there in 48.5 g of sodium hydroxide.

A mole is defined as 6.02214076 × \(10^{23}\)of some chemical unit, be it atoms, molecules, ions, or others. The mole is a convenient unit to use because of the great number of atoms, molecules, or others in any substance.

1. Determination of the percentage of sodium in sodium hydroxide.

Molar mass of NaOH = 23 + 16 + 1 = 40 g/mol

Mass of Na in NaOH = 23 g

Percentage of Na = mass of Na / Molar mass of NaOH × 100

Percentage of Na = 23/40 × 100

Percentage of Na = 57.5%

2. Determination of the mass of sodium in 48.5 g of sodium hydroxide.

Molar mass of NaOH = 23 + 16 + 1 = 40 g/mol

Mass of Na in NaOH = 23 g

The total mass of NaOH = 48.5 g

Mass composition of Na = mass of Na / Molar mass of NaOH × Total mass

Mass composition of Na = 23/40 × 48.5

Mass composition of Na = 27.89 g

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Answer:

Explanation:

                                       Answer:

Explanation: stay the same

Answer: We must first compute the quantity of H2O that can result from the reaction of AL(CH)3 and H2SO4 in order to determine the mass of H2O produced.

Explanation:

Let's begin by formulating the reaction's balanced chemical equation:

Al2(SO4)3 + 6 H2O + 2 CH4 = 2 AL(CH)3 + 3 H2SO4

According to the equation, 2 moles of AL(CH)3 and 3 moles of H2SO4 combine to form 6 moles of H2O.

1.75 g of AL(CH)3 is equal to: 1.75 g / 78.0 g/mol = 0.0224 mol of AL(CH)3 as 1 mole of AL(CH)3 has a molar mass of roughly 78.0 g/mol.

2.00 g of H2SO4 is equal to: 2.00 g / 98.1 g/mol = 0.0204 mol of H2SO4 as 1 mole of H2SO4 has a molar mass of roughly 98.1 g/mol.

In order to calculate the amount of H2O produced, we must now identify the limiting reagent.

We contrast the moles of AL(CH)3 and H2SO4 in use. AL(CH)3 and H2SO4 have a stoichiometric ratio of 2 to 3. As a result, 3 moles of H2SO4 are required for every 2 moles of AL(CH).

The equation states that 2 moles of AL(CH)3 will yield 6 moles of water. Therefore, we can calculate the moles of H2O created for 0.0224 mol of AL(CH)3 as follows: 0.0224 mol AL(CH)3 (6 mol H2O / 2 mol AL(CH)3) = 0.0672 mol H2O

Finally, we may use the molar mass of H2O to convert its moles to grams. H2O has a molar mass of about 18.0 g/mol:

18.0 g/mol x 0.0672 mol H2O = 1.21 g H2O

As a result, the mass of H2O generated is roughly 1.21 grams if H2SO4 is the limiting reagent.

According to this scientific tenet, matter cannot be generated or destroyed in a closed system. This implies that all of the carbon on with us planet seems to have been present and will continue to be present.

Crystalline substance carbon has to have the atomic radius six and the letter C assigned to it. The tetravalent atom's nonmetallic nature and four accessible electrons allow it to establish covalent chemical bonds. The periodic table's group 14 includes it. The crust of the Earth contains 0.025 percent carbon.

Coke and charcoal, both made from wood, are forms of impure carbon used in the smelting of metals. It is crucial for the copper and steel industry in particular. Graphite is utilized in furnace inner lining, electrical brushes, and pencils.

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Answer : The correct match is:

1 positive charge = 1 negative charge

2 positive charges = 2 negative charges

3 positive charges = 3 negative charges

Explanation :

As we now that there are three subatomic particles which are protons, electrons and neutrons.

The protons and neutrons are located inside the nucleus and electrons are located around the nucleus.

The protons are positively charged, the electrons are negatively charged and neutrons are neutral.

As we know that all the things are made up of charges and opposite charges attract to each other.

In a neutral atom, the positive charges and negative charges are balanced in an object. That means, in neutral atom the number of positive charges are equal to the negative charges.

So we can say that:

1 positive charge = 1 negative charge

2 positive charges = 2 negative charges

3 positive charges = 3 negative charges

Answer:

1 positive---- 1 negative

2 positive---- 2 negative

3 positive---- 3 negative

Explanation:

edge 2023

Multiplying by 1000 will allow you to convert 35 liters to milliliters

1 Liters = 1000 milliliters

Thus, multiply the value in liter by 1000 will convert it to milliters

With the above scale, we can convert 35 liters to milliliters. Details below:

We can convert 35 liters to milliliters as illustrated below:

1 Liters = 1000 milliliters

Therefore,

35 liters = (35 liters × 1000 milliliters) / 1 liters

35 liters = 35000 milliliters

Thus, 35 liters is equivalent to 35000 milliliters

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A compound is composed of two or more elements. Elements are composed of atoms.

In question 2, we can see that Helium gas is not a compound. A sample of Helium is made up of individual atoms of helium which are not chemically combined.

In question 3, the true statement about elements and compounds is that they are homologous in nature.

In question 4, the element mentioned among the list is iron. It is not chemically combined.

In question 5, The statement that describes an element is that it is the simplest substance.  Elements have separate existence.

In question 6, the statements that correctly describes a compound ar;

In question 7, When hydrogen and oxygen gas combine, the result is water.

In question 8, a salt is made up of sodium and chlorine. This is our common table salt.

The correct matches for question 9 are;

In question 10, the symbol that does not depict an element is pz.

For question 11, the correct matches;

Aluminum: ELEMENT

Mercury: ELEMENT

Ferrous Sulfate: COMPOUND

Sucrose: COMPOUND

Carbon: ELEMENT

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As per the balanced reaction of Al and oxygen gas, 4 moles of Al needs 3 moles of oxygen gas. Hence, 7 moles of Al needs 5.2 moles of O₂.

Aluminum metal is more reactive towards oxygen and it forms oxides on its surface. The balanced chemical equation of the reaction between Al and oxygen is written as follows:

\(\rm 4 Al + 3O_{2}\rightarrow2 Al_{2}O_{3}\)

As per this reaction, 4 moles of aluminum needs 3 moles of oxygen molecule. Then, the number of moles oxygen molecule required to react with  7 moles of Al is :

no.of moles of O₂  = (7×3)/4 = 5.2

Therefore, 5.2 moles of oxygen gas is required to completely react with 7 moles of aluminum metal.

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Answer:

P_2 =0.51  atm

Explanation:

Given that:

Volume (V1) = 2.50 L

Temperature (T1) = 298 K

Volume (V2) = 4.50 L

at standard temperature and pressure;

Pressure (P1) = 1 atm

Temperature (T2) = 273 K

Pressure P2 = ??

Using combined gas law:

\(\dfrac{P_1V_1}{T_1} = \dfrac{P_2V_2}{T_2} \\ \\ \dfrac{1 *2.5}{298} = \dfrac{P_2*4.5}{273}\)

\(0.008389261745 \times 273 = 4.5P_2\)

\(P_2 =\dfrac{0.008389261745 \times 273 }{4.5}\)

\(P_2 =0.51 \ atm\)

Answer:

Zinc with copper is Brass, Zinc is alloyed with Lead and Tin to make solder.

One time explanation of one observation is a hypothesis.

Whenever, an assumption is made juts by observation and without proper testing then that is referred as an hypothesis.

For example- If my friend is late, so I might assume that he or she must have been stuck in traffic. So, this assumption is not tested yet and is made based on my observation. So, this is a hypothesis.

Whenever, a conclusion is given after several experiments and testing after observing something in science is referred as scientific theory.

For example- Atomic theory given by Dalton was based on several experiments. However, theories can also be proved wrong as Dalton's theory was proved wrong later on my JJ Thomson.

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An aromatic compound is cyclohexadiene

An aromatic compound is a type of organic compound that contains a ring of atoms with alternating double bonds, known as an aromatic ring or an arene. The most common and well-known example of an aromatic compound is benzene, which has a ring of six carbon atoms with alternating double bonds.

Aromatic compounds are characterized by their unique chemical and physical properties, including their stability. They are know to be  planar and lack alkene like reactivity due to enhanced resonance stabilization.

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A compound will not be classified as aromatic if it is not cyclic, planar, or, have a continuous ring of pi electrons that follows Hückel's rule.  

An organic compound would not be classified as an aromatic compound if it does not meet the criteria for being an aromatic compound.

The criteria for being an aromatic compound include being:

If an organic compound is not cyclic or planar, or if it does not have a continuous ring of pi electrons that follows Hückel's rule, then it would not be classified as an aromatic compound.

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We can measure the slope of the tangent line to the curve at a certain position on a graph to calculate the pace of a response at that time.

A reaction is a process in which one or more reactants are changed into one or more products, also known as the final products. Atoms are rearranged and chemical bonds are made and broken between the atoms during a chemical reaction, which transforms reactants into products.

The instantaneous rate of the response at that particular time is indicated by the slope of the tangent line.

If we have a graph of the quantity of product produced over time, for instance, we can choose a point on the curve that represents a certain period, draw a tangent line to the curve at that location, and then calculate the slope of the line. The pace of the reaction at that specific moment is shown by the slope of the tangent line.

The average rate of the response over a certain period of time can be calculated by repeating this method at various points on the curve to produce a series of instantaneous rates.

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Answer:

name four agricultural inputs are subsidized by the government

0.297 kJ of heat is needed to raise the temperature of 10g of aluminum from 22 degrees Celsius to 55 degrees Celsius.

The specific heat is the amount of heat per unit mass required to raise the temperature by one degree Celsius.

It is a measure of how much energy it takes to raise the temperature of a substance. It is the amount of heat necessary to raise one mass unit of that substance by one temperature unit.

It is given by the formula -

                                                  Q = mcΔT

where, Q = amount of heat

m = mass

c = specific heat

ΔT = Change in temperature

Given,

mass = 10g

c = 0.901J/g⁰C

Initial temperature (T₁) = 22⁰C

Final Temperature (T₂) = 55⁰C

Q = mcΔT

= 10 × 0.901 × (55 -22)

= 297.33 J = 0.297 kJ

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Simple atomic models called Bohr-Rutherford diagrams display how many electrons are present in each of an atom's outermost shells.

The Bohr theory only applies to organisms with a single electron. Three electrons make up the lithium atom. Hence, the lithium atom does not fit into Bohr's hypothesis.

Lithium is an air-reactive alkali metal that tarnishes quickly to a dull silvery-grey and finally black. It is a silvery-white to grey alkali metal with a metal-lic lustre when new. At 20 °C, it is the least dense and lightest metal of all the elements that are not gases, and it floats on water.

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Two key criteria that engineers must prioritize are efficiency and safety. By emphasizing efficiency and safety during process development, engineers can create robust and reliable processes that not only maximize productivity but also prioritize the well-being of personnel and the environment.

When developing a process, engineers need to consider several important criteria. Two key criteria that engineers must prioritize are efficiency and safety.

Efficiency is crucial in process development to ensure optimal use of resources, time, and energy. Engineers strive to design processes that maximize productivity, minimize waste, and reduce costs. This involves optimizing reaction conditions, streamlining workflow, and implementing automation where possible. Efficiency considerations also extend to energy consumption, raw material utilization, and overall process sustainability.

Safety is another critical aspect that engineers must prioritize. They need to identify and mitigate potential hazards associated with the process, ensuring the safety of both personnel and the environment. This involves conducting thorough risk assessments, implementing safety protocols, and designing equipment and systems with safety features. Engineers must also consider the safe handling and storage of materials, as well as potential risks during transportation and disposal.

By emphasizing efficiency and safety during process development, engineers can create robust and reliable processes that not only maximize productivity but also prioritize the well-being of personnel and the environment.

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The number of moles of lead iodide formed is 0.000275 moles

The equation of the reaction is as follows:

MI₂ (aq) + Pb(NO₃)₂ (aq) ----> M(NO₃)₂ (aq) + PbI₂ (s)

The number of moles of MI₂ that reacted is 0.000275 moles

The group 2 metal is Calcium whose molar mass is 40.0 g

a. From the given values:

Mass of lead iodide precipitated = 0.1270 g

molar mass of lead iodide = 461 g/mol

number of moles = mass / molar mass

number of moles of lead iodide formed = 0.1270 g / 461 g /mol

number of moles of lead iodide formed = 0.000275 moles

b. The equation of the reaction shows the reactants as well as the products formed after reaction.

The general molecular equation is given as :

MI₂ (aq) + Pb(NO₃)₂ (aq) ----> M(NO₃)₂ (aq) + PbI₂ (s)

The net ionic equation is given as:

Pb²⁺ (aq) + 2 I⁻ (aq) ---> PbI₂ (s)

c. 1 mole of MI₂ reacts with 1 mole of Pb(NO₃)₂ to produce 1 mole of M(NO₃)₂ and 1 mole PbI₂

Since 0.000275 moles of PbI₂ was formed, it would require 0.000275 moles MI₂ to be formed.

Number of moles of MI₂ that reacted = 0.000275 moles

d. Mass of 0.000275 moles of MI₂ = 0.0810 g

mass of 1 mole of MI₂ = 0.0810 / 0.000275 =294.5 g

In 294.5 g of MI₂, mass composition of Iodide = 127 * 2 = 254 g

Therefore mass of the metal = mass of compound - mass of iodine in the compound

mass of metal, M = 294.5 - 254 = 40.5 g

The group 2 metal is Calcium whose molar mass is 40.0 g

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Answer:

From fastest to slowest its: (4)A to B, (1)E to F, (3)C to D, (2)D to E

Explanation:

The steeper the line is the faster she went. D to E she didn't make any progress because the line is straight. Sry I'm terrible at explaining things.

NH3 is the chemical compound produced as a product in the given balanced chemical equation.

With the formula NH3, ammonia is a nitrogen and hydrogen inorganic chemical. A Lewis base is urea. Ammonia is a colourless, extremely unpleasant gas that has a strong, suffocating stink when it is present at room temperature. It is hygroscopic and known as anhydrous ammonia in its pure state (readily absorbs moisture). Ammonia is corrosive and has alkaline qualities.

Water molecules' shared dipoles and development of hydrogen bonds with one another account for this. As a consequence, the molecules of water and ammonia are both made up of dipoles that exert significant electrostatic forces on one another.

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Answer:

Gravitational Energy: The energy of an object due to its movement

Mechanical Energy: The potential energy of position

Nuclear Energy: internal energy caused by vibrations of atoms and molecules

Thermal Energy: Energy stored in the nucleus of an atom

Answer:

radiant

nuclear

thermal

potential

Explanation:

Answer:

Enclosed gas.

Explanation:

Taking into account the definition of sensible heat, the energy required to raise the temperature of 4.2 mol of graphite by 25.0°C is 895.3455 J.

Sensible heat is defined as the amount of heat that a body absorbs or releases without changes in its physical state (phase change). In other words, when a system absorbs (or gives up) a certain amount of heat, it can happen that it experiences a change in its temperature without a phase change occurring, which implies sensible heat.

The expression that allows to calculate heat exchanges is:

Q = c× m× ΔT

where:

In this case, you know:

Replacing in the definition of sensible heat:

Q = 0.71 J/gC× 50.442 g× 25 C

Solving:

Q= 895.3455 J

In summary, the energy required is 895.3455 J.

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Conversion factor used to convert volume is 1L = 1000 mL.

15.43L = 15430mL

The same attribute is expressed using a unit conversion but in a different unit of measurement. For instance, time can be expressed in minutes rather than hours, and distance can be expressed in kilometers, feet, or any other measurement unit instead of miles. Measurements are frequently offered in one set of units, like feet, but are required in another set, like chains. A conversion factor is a mathematical equation that facilitates an equal exchange of feet for chains.

A conversion factor is a number that is used to multiply or divide one set of units into another. If a conversion is required, it must be done using the correct conversion factor to get an identical value.

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