When salt water is heated leaving behind solid salt, this is separating a mixture by what method?
A)
chromatography
B)
evaporation
Eliminate
filtration
D)
sifting

Answer:

I'm pretty sure its the percent difference between the two (starting mass and mass retrieved)

Explanation:

Don't blame me if I'm wrong :x

The balanced chemical equation for the complete combustion of propan-2-ol (also known as isopropanol) is: C₃H₈O + 5O₂ → 3CO₂ + 4H₂O.

Complete combustion is a chemical reaction between a fuel and an oxidant that produces only carbon dioxide and water vapor as the products. In other words, in complete combustion, all of the fuel is burned completely, producing the maximum amount of heat and light energy. The general equation for complete combustion of a hydrocarbon fuel is: hydrocarbon + oxygen → carbon dioxide + water. In this reaction, methane reacts with oxygen to produce carbon dioxide and water vapor. This reaction is exothermic, meaning it releases heat energy, and it is used in many applications such as heating and energy production. Complete combustion is different from incomplete combustion, where the fuel is not burned completely and other products such as carbon monoxide (CO) and unburned hydrocarbons are produced. Incomplete combustion is generally less efficient and can produce harmful pollutants.

Here,

This equation shows that one molecule of propan-2-ol reacts with five molecules of oxygen gas to produce three molecules of carbon dioxide and four molecules of water vapor. This reaction releases energy in the form of heat and light and is a common way of producing energy from organic fuels. The balanced equation shows that the number of atoms of each element is the same on both sides of the equation, which is a requirement for a balanced chemical equation.

To know more about complete combustion,

https://brainly.com/question/14177748

#SPJ9

Answer:

99 L

Explanation:

Step 1: Given data

Moles of nitrogen: 4.4 moles

Step 2: Calculate the volume occupied by 4.4 moles of nitrogen

The volume occupied by a gas depends on other conditions such as pressure  (P) and temperature (T). If we have this information, we can calculate the volume of the gas using the ideal gas condition.

P × V = n × R × T

Since the task doesn't inform the conditions, we can assume it is under standard pressure (1 atm) and temperature (273.15 K). At STP, 1 mole of any gas occupies 22.4 L.

4.4 mol × 22.4 L/1 mol = 99 L

Answer:

A.)  C₃H₈N

Explanation:

The given compound is written in its molecular formula form. The molecular formula represents the amount of each atom in a compound. The empirical formula represents the smallest whole number ratio of each type of atom in a compound.

In the compound, C₆H₁₆N₂, there are 6 carbons, 16 hydrogens, and 2 nitrogens. Because these are all even amounts, you can divide each by 2.  As such, the empirical formula is C₃H₈N.

Answer:

I believe the answer is "b". "During the experiment, the scientist has only one element, or variable, that is changed to test the hypothesis."

Explanation:

I remember from last year but I'm not totally sure. Good luck!

The experimental setup has been the design that includes the experimental and the control group. during the experiment, only one variable is changed to test the hypothesis. Thus, option b is correct.

The experiment design includes the testing of the hypothesis to solve the problem and reach the solution through the analysis of the observations. It has been the setup that includes the test and the control group that involves the dependent, independent, and controlled variables.

Testing one variable in the experimental designs means changing one of the elements of the experience to prove the reliability of the hypothesis. This variable is the factor that alters and affects the other factors of the experiment and leads to a cause and effect.

The result of the effect of the hypothesis proves the testability of the experiment and provides solutions to the research question. This further leads to the formulation of the law and theory.

Therefore, option A. testing one variable involves proving the hypothesis.

Learn more about experimental design, here:

https://brainly.com/question/17280313

#SPJ6

Taking into account the reaction stoichiometry, 2.44245 grams of C₈H₁₈ is consumed by the reaction of 8.57g of oxygen gas.

In first place, the balanced reaction is:

2 C₈H₁₈ + 25 O₂ → 16 CO₂ + 18 H₂O

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

The molar mass of the compounds is:

Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

Mass of octane consumed

The following rule of three can be applied: If by reaction stoichiometry 800 grams of O₂ react with 228 grams of C₈H₁₈, 8.57 grams of O₂ react with how much mass of C₈H₁₈?

\(mass of C_{8} H_{18} =\frac{8.57 grams of O_{2} x228 grams of C_{8} H_{18}}{800grams of O_{2}}\)

mass of C₈H₁₈= 2.44245 grams

Finally, 2.44245 grams of C₈H₁₈ is consumed by the reaction of 8.57g of oxygen gas.

Learn more about the reaction stoichiometry:

brainly.com/question/24741074

brainly.com/question/24653699

#SPJ1

The addition of \(O_2(g)\) will shift the equilibrium towards the right side of the reaction and will consume \(Cl_2(g)\).

For more questions on equilibrium

https://brainly.com/question/29398344

#SPJ8

Answer:

A. What is the concentration of nitric acid?

Explanation:

its right

Answer:

A

Explanation:

Volume would the helium gas occupy at a pressure of 1.00 atm is 2.08 Liters by using Charle's law.

Helium is a safe, non-flammable gas that is frequently used to fill balloons for festivals and parades. Helium, however, is a crucial component in a variety of industries, including high technology, science, and even national security.

According to Charle's Law: V1 / T1 = V2 / T2, the volume that helium gas would occupy at a pressure of 1.00 atm

V1/T1=V2/T2

12/25=V2/1

V2=2.08 L

Everything is conceivable. Pure helium inhaling causes the body to lose oxygen as if you were holding your breath. If you were unable to breathe at all, your body would run out of blood-stored oxygen within minutes, and you would start to lose consciousness.

Learn more about Charle's Law here

https://brainly.com/question/30759302

#SPJ1

Answer:

gravity

Explanation:

There is a law called conservation of energy which states that energy can neither be created nor be destroyed. It can be only transferred from one form to another form. Therefore, the correct option is option A.

Energy transfer is a phenomenon in which energy transfer from one matter to another matter. Energy can be transferred in two forms that are by doing work or by transferring heat.

To move any object energy is required so work has to be done by the gas to the piston. Heat can be transferred by three ways conduction, convention and radiation. In conduction, when two object are in direct contact, transfer of molecules takes place. Wind blowing at 3 km/h has kinetic energy. Anything that move possess kinetic energy.

Therefore, the correct option is option A.

Learn more about energy transfer, here:

https://brainly.com/question/18649915

#SPJ2

The mass of the oxygen gas that is consumed in the process is 5491.2 g.

Stoichiometry is important in chemical reactions because it allows us to predict the amount of products that can be produced from a given amount of reactants, and to determine how much of each reactant is needed to produce a desired amount of product.

The equation of rust is;

4Fe + 3O2 → 2Fe2O3

Number of mols of iron III oxide

= 18.3 * 10^3g/160 g/mol

= 114.4 moles

Now;

3 moles of O2 produces 2 moles of iron III oxide

x moles of O2 produces 114.4 moles of Fe2O3

=171.6  moles

Mass of oxygen = 171.6 moles * 32 g/mol

= 5491.2 g

Learn more about stoichiometry:https://brainly.com/question/30215297

#SPJ1

A hydrogen atom must absorb 1.815x10⁻¹⁹ Joules of energy in order to transfer electrons from n=3 to n=6.

Let,

Energy absorbed by photon=13.6 z²(1/n₁²-1/n₂²)

E₃₋₆=13.6×1²(1/3²-1/6²)

    =(13.6×3/36)ev

E₃₋₆=1.133 eV

to convert energy into J from eV,

E₃₋₆=1.133 eV× 1.602×10⁻¹⁹

E₃₋₆=1.815x10⁻¹⁹ Joules

Electrons are subatomic particles that have a negative electric charge. They are one of the building blocks of matter and are found in the shells that orbit the nucleus of an atom. Electrons play a crucial role in many physical and chemical processes, such as electricity, magnetism, and chemical bonding. They are incredibly tiny, with a mass of about 9.11 x 10⁻³¹ kg and a size of about 10⁻¹⁸ meters. They are also incredibly fast, moving at speeds close to the speed of light. Electrons can be found in a variety of environments, from the atoms that make up the world around us to the free electrons in metals that allow for the flow of electricity.

Learn more about Electrons here:

https://brainly.com/question/9399236

#SPJ4

Answer:

See explanation

Explanation:

The boiling point of  a substance at a location depends mostly on the atmospheric pressure in that location. The lower the atmospheric pressure in a location, the lower the boiling point and vice versa.

Boiling point is defined as the temperature at which the vapor pressure of the liquid becomes equal to the atmospheric pressure.

In Denver (the mile high city), alcohol will boil at a lower temperature(due to its high altitude) than in Houston because pressure decreases with height.

The boiling point of alcohol in Houston and Denver will vary as a result of the difference in atmospheric pressure.

The boiling point of  a compound at a particular location depends on the

atmospheric pressure of that location. The lower the atmospheric pressure

of a given place or area, the lower the boiling point and vice versa.

In Denver (the mile high city), alcohol will boil at a lower temperature as a

result of its higher altitude than in Houston because atmospheric pressure

decreases with increase in height and vice versa.

Read more on https://brainly.com/question/19529723

Answer:

Yes

Explanation:

The speed of light is about 300 000 km per second, so light takes about 1.28 seconds to travel from the Moon to the Earth.

Answer:

Explanation:

ask you teacher

The student's method for preparing pure crystals of copper sulfate contains errors and does not produce the desired outcome.

Use copper oxide instead of calcium carbonate: The student should add copper oxide (CuO) to the hydrochloric acid instead of calcium carbonate. Copper oxide reacts with hydrochloric acid to form copper chloride, which can then be converted to copper sulfate through a subsequent reaction with sulfuric acid.

Add sulfuric acid to the copper chloride solution: After the copper chloride solution is formed, the student should add sulfuric acid to it. This reaction between copper chloride and sulfuric acid will yield copper sulfate and hydrochloric acid. The student should ensure that the correct stoichiometric ratio is maintained to maximize the yield of copper sulfate crystals.

Crystal formation: The student should allow the solution to cool slowly after the reaction with sulfuric acid. This promotes the formation of larger, well-defined copper sulfate crystals.

Filtration and drying: Once the crystals have formed, the student should filter the solution to separate the solid crystals from the remaining liquid. The filtered crystals should then be thoroughly dried to remove any remaining water, resulting in pure copper sulfate crystals.

By following these improvements, the student can obtain pure crystals of copper sulfate.

For more such questions on copper sulfate visit:

https://brainly.com/question/17439051

#SPJ8

Answer:

33.6g/mol is the molar mass of the unknown acid

Explanation:

The molar mass of a substance is defined as the ratio of the mass of the acid (0.138g) and the moles of the substance.

The diprotic acid, H₂X, reacts with magnesium hydroxide, Mg(OH)₂ as follows:

H₂X + Mg(OH)₂ → MgX + 2H₂O

Where 1 mole of the diprotic acid reacts per mole of magnesium hydroxide

To find the moles of the acid and solve the molar mass of it we need to find the moles of magnesium hydroxide added to the solution at equivalence point = Moles of diprotic acid as follows:

22.8mL = 0.0228L * (0.1800moles / L) = 4.104x10⁻³ moles of the acid.

The molar mass is:

0.138g / 4.104x10⁻³ moles =

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.

For more question on bonds

https://brainly.com/question/29794367

#SPJ8

Answer:

False

Explanation:

"Observations is the action of observing something or someone carefully or in order to gain information" - google dictionary. This definition does not completely match the definition given, so the answer is false.

I hope this helps!

Answer: true

Explanation: the action or process of observing something or someone carefully or in order to gain information that is the real definition

Answer:

In a single-displacement reaction, only one substance is replaced in a compound. In a double-displacement reaction, two substances are replaced in compounds.

Explanation:

The force applied to the rocket by its engines remains constant as it moves up, while its mass decreases, resulting in an increase in acceleration.

Newton's laws of motion provide an explanation for the acceleration of a rocket as it moves away from the ground. According to Newton's second law, the force exerted on an object is directly proportional to its acceleration, and the force required to move an object increases as its mass increases.

In the case of a rocket, its mass decreases as it consumes fuel, which means that less force is required to move it as it climbs higher into the atmosphere.

As the rocket moves up, its acceleration increases while the force exerted on it remains constant. Newton's second law of motion explains that the acceleration of an object is directly proportional to the force applied to it. According to the second law of motion, an object's acceleration is equal to the force exerted on it divided by its mass.

This means that as the rocket climbs higher and its mass decreases due to the consumption of fuel, less force is required to accelerate it, and so its acceleration increases. In other words, the rocket's acceleration is increasing because the force required to move it is decreasing due to the decreasing mass of the rocket.

This phenomenon is also related to Newton's third law of motion, which states that every action has an equal and opposite reaction. The force exerted by the rocket's engines is balanced by an equal and opposite force exerted on the rocket by the exhaust gases, according to this law.

For more such questions on acceleration visit;

https://brainly.com/question/26590057

#SPJ8

Answer:

Trioxocarbonate (iv) are salts derived from trioxocarbonate (iv) acid when it reacts with metals and metallic oxides. All trioxocarbonate (iv) salts of Sodium (Na), Potassium (K) and Ammonium(NH4+) are soluble while all others are insoluble.

Answer:

of different elements with different electronegativities

Explanation:

A molecule containing two atoms "of different elements with different electronegativities"

A polar covalent bond exists when two different atoms (non-metals) with different electronegativities are able to share their electrons in a covalent bond.

Some examples of polar covalent bonds are seen in:

1. Ammonia(NH3): The polar covalent bonds exists between the nitrogen and hydrogen atoms.

2. Water(H2O): The polar covalent bond exists between hydrogen and oxygen. The oxygen molecule has a net negative charge while the hydrogen atoms have a net positive charge.

The rate law and the value of k for the given reaction is 1.7×103 M⁻²s⁻¹. Therefore, option D is correct.

The word "rate law" refers to an expression that expresses reaction rate as the product of the stoichiometric coefficient of the reacting species in a balanced chemical equation multiplied by the molar concentration of the reactants, with each term raised to a power.

\(\rm Rate = k \times [NO]^{n} x [O_{2}]^ {m}\)

Thus, m must = 1

\(\rm Rate\ 1 = k \times [NO 1]^ {m} x [O_{2} 1]^ {n}\\Rate\ 2 = k \time [NO 2]^ {m} x [O_2 2]^ {n}\)

Rearranging this equation

\(Rate1 / [O_2 1]^{n} = k x [NO1]^ {m}Rate2 / [O_2 2]^{n} = k x [NO2]\)

but  [NO 1] = [NO 2]

Hence,

\(Rate1 / [O_2 1]^ {n}= Rate2 / [O_2 2]^{n}\)

Rearranging and substituting in the values

\(([O_2 2] / [O_2 1])^{n} = Rate2 / Rate 1\)

\(2^{n} = 2\)

So, n = 1

Same from run 1 to 3

[NO] doubled

[O₂] stayed constant

Rate quadrupled

\((2)^{n} = 4\)

n = 2

we know that rate = k x [NO]² x [O₂]

Substitute in any value for [NO], [O₂] and rate and calculate K

k = rate / [NO]² x [O₂]

= (8.55x10⁻³ M / sec) / ((0.030M)² x (0.0055M))

= 1.7×103 M⁻²s⁻¹

Thus, option D is correct.

To learn more about the rate law follow the link;

https://brainly.com/question/30379408

#SPJ9

Your question is incomplete, most probably complete question is

Determine the rate law and the value of k for the following reaction using the data provided.

2 NO(g) + O2(g) 2 NO2(g)

[NO]i (M) [O2]i (M) Initial Rate (M-1s-1)

0.030 0.0055 8.55 x 10-3

0.030 0.0110 1.71 x 10-2

0.060 0.0055 3.42 x 10-2

A. Rate = 57 M-1s-1[NO][O2]

B. Rate = 3.8 M-1/2s-1[NO][O2]1/2

C. Rate = 3.1×105 M-3s-1[NO]2[O2]2

D. Rate = 1.7×103 M-2s–1[NO]2[O2]

Answer:

recordando también que ** 1mL = 1cm ^ 3 **

(como ** 1 dm ^ 3 = 1 L **)

Answer:

i think its B.

Explanation:

i will grop up i want to be a pilot, save pakistan and destroy india

grape