What effect does a solute have on the freezing and boiling points of the solution?

The four known elements that make up 96 percent of the mass of the human body are the following: Oxygen or O in the Periodic table, Carbon or C, Hydrogen or H, and Nitrogen or N in the periodic table. These are the 4 elements that makes up the body mass of an individual.

Answer: a pattern in nature observed over and over

Explanation:

Scientific law is the statement(s) which describes or helps in the predicting the natural phenomena. The information in the scientific law is valid and it is verified by the experimental procedures and observations. It can be used to explain the cause of a natural phenomena, conditions responsible for natural phenomena, occurrence of the natural phenomena, also gives information why a natural phenomena repeat itself over and over again.

The density of the substance is found by dividing its mass by its volume. The volume of the substance is determined by the change in the water level in a graduated cylinder when the substance is added. The calculated density of the substance is 2.6 g/cm³.

The density of a substance can be calculated by using the formula: Density = Mass / Volume. In this case, the volume of the substance can be determined by the change in water level in the graduated cylinder when the substance is added. The initial volume is 8.0 cm³, and the final volume is 10.5 cm³. So, the volume of the substance is the difference between the two volumes, which is 2.5 cm³.

The mass of the substance is given as 6.50 g. Now, we can substitute the mass and volume into the formula to find the density: Density = 6.50 g / 2.5 cm³ = 2.6 g/cm³. So, the density of the substance is 2.6 g/cm^3.

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The answer is C.33S. I had this question as well. Hope this helps you :)

The symbol of a chemical element whose atom has 16 protons and 17 neutrons is 33S. Thus, the correct option for this question is C.

Protons may be defined as the type of sub-atomic particles that are significantly present in the nucleus of an atom along with neutrons. Protons are positively charged in nature. It might be thought that protons are discovered by Ernest Rutherford.

If an atom has 16 protons, it means that it has an atomic number of 16. According to the periodic table, the atomic number 16 is occupied by the sulfur element. While chlorine elements have an atomic number of 17.

Now, the atomic mass is equal to the number of protons plus the number of neutrons. So, atomic mass = 16 + 17 = 33.

Therefore, the symbol of a chemical element whose atom has 16 protons and 17 neutrons is 33S. Thus, the correct option for this question is C.

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The hypothesis for solubility has been, "With the increase in temperature there has been an increase in solubility."

The solubility has been the extent of the dissolution of the solute in the solvent without being precipitated out. The solubility has been dependent on the bonding of solute molecules with the solvent.

The hypothesis for the effect of temperature on solubility has been:

With the increase in temperature, there has been an increase in solubility.

The research has been mediated with the acceptance of the hypothesis with the increased solubility as there have been more available solute molecules for dissolution with the solvent molecules.

Thus, the hypothesis for solubility has been, "With an increase in temperature there has been an increase in solubility."

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Answer : The atomic mass of the atom is composed of the mass of protons + neutrons.

Explanation :

Atomic number : It is defined as the number of protons or number of electrons.

Atomic number = number of protons = number of electrons

Atomic mass : It is defined as the sum of number of protons and number of neutrons.

Atomic mass = Number of protons  + Number of neutrons

For example : The sodium (Na) elements has atomic number 11. That means, the number of electrons and number of protons is equal to 11. The number of neutrons are 12. So, the atomic mass will be:

Atomic mass of Na = Number of protons  + Number of neutrons

Atomic mass of Na = 11 + 12 = 23

Hence, the atomic mass of the atom is composed of the mass of protons + neutrons.

Answer : The order of the coefficients of each substance in the following neutralization reaction are, 1, 2, 1, 2

Explanation :

Balanced chemical reaction : It is defined as the chemical reaction in which the number of individual atoms of an element in reactant side always be equal to the number of individual atoms of an element in product side.

The given unbalanced reaction will be,

[tex]H_2SO_4+LiOH\rightarrow Li_2SO_4+H_2O[/tex]

In order to balance the chemical reaction, the coefficient 2 is put before the reactant [tex]LiOH[/tex] and product [tex]H_2O[/tex].

The balanced chemical reaction will be,

[tex]H_2SO_4+2LiOH\rightarrow Li_2SO_4+2H_2O[/tex]

By the stoichiometry we can say that, 1 moles of [tex]H_2SO_4[/tex] react with 2 moles of [tex]LiOH[/tex] to give 1 mole of [tex]Li_2SO_4[/tex] and 2 moles of [tex]H_2O[/tex] as a product.

Hence, the order of the coefficients of each substance in the following neutralization reaction are, 1, 2, 1, 2

Final answer:

To find the volume of a urine sample with a mass of 147 g and a density of 1.010 g/ml, divide the mass by the density. The volume is 145.54 ml.

Explanation:

The volume of the urine sample can be calculated using the formula:

Volume = Mass / Density

Given data:

Substitute the values and calculate:

Volume = 147 g / 1.010 g/ml = 145.54 ml

Therefore, the volume of the urine sample is 145.54 ml.

Answer:

updraft stage

Explanation:

Answer;

-Remote sensing

Explanation;

-Remote sensing involves obtaining information about objects or areas from a distance, typically from aircraft or satellites.

-Remote sensors collect data by detecting the energy that is reflected from Earth. These sensors can be on satellites or mounted on aircraft.Remote sensing has a wide range of applications, such as coastal applications (monitoring shoreline changes), ocean applications to monitor ocean circulation and current systems, and hazard assessments among other applications.

To obtain 75.0 grams of nickel from an ore that is 32.6% nickel by mass, one would need to mine approximately 0.230 kilograms of the ore.

The student is asking about the quantity of a nickel ore that would need to be processed to obtain a specific amount of pure nickel. If the ore is 32.6% nickel by mass, one needs to perform a simple calculation by setting up a proportion:

32.6 g ore contains 1 g nickel,

The calculation is as follows:

Multiply the desired quantity of nickel (75.0 g) by 100.

Divide this product by the percentage of nickel in the ore (32.6%).

This gives the mass of the ore required to be:

(75.0 g nickel) × (100/32.6) / 100% = 230 g ore (approximately, using significant figures)

To convert this to kilograms, we know that 1 kg = 1000 g, so:

230 g = 0.230 kg

Therefore, one would need 0.230 kilograms of this nickel ore to extract 75.0 grams of nickel.

Final answer:

To determine if a homogeneous liquid is a solution or a pure substance, examine its composition and properties. A homogeneous mixture, such as a solution, has a uniform composition throughout, while a pure substance has a fixed and definite composition. Perform tests like measuring boiling or freezing points to confirm the nature of the liquid.

Explanation:

A sample of a homogeneous liquid can be determined to be a solution or a pure substance by examining its composition and properties.

In a homogeneous mixture, such as a solution, the composition is uniform throughout the mixture. This means that any sample of the liquid will have the same composition as any other sample. On the other hand, a pure substance, which can be either an element or a compound, has a fixed and definite composition.

To determine whether the liquid is a solution or a pure substance, you can perform tests such as measuring its boiling or freezing point. If the liquid has a consistent boiling or freezing point, it indicates that it is a pure substance. If the liquid does not have a fixed boiling or freezing point, it suggests that it is a solution since the different components may have different boiling or freezing points.

Answer:

Sequence will be:

NaCl

Na₂SO₄

Na₂S

Explanation:

The silver ions get precipitated on addition of chloride ion as silver chloride.

So we will add NaCl in the first step.

The following reaction will occur.

[tex]Ag^{+}+Cl^{-}--->AgCl(s)[/tex]

Lead and nickel are soluble in sodium chloride (lead chloride and nickel chloride).

[tex]Pb^{+2}[/tex] will get precipitated as lead sulfate and nickel will remain soluble as nickel sulphate is soluble in water.

The reaction will be:

[tex]Pb^{+2}+2SO_{4}^{-2}--->PbSO_{4}(s)[/tex]

Then nickel will be precipitated as sulfide.

The reaction will be:

[tex]Ni^{+2}+2Cl^{-} ---->NiCl_{2}(s)[/tex]

Answer:

2

Explanation:

Answer:

n = 2

Explanation:

The first quantum number of 2s2 electron in phosphorus will be 2 which is principle quantum number.

Quantum numbers are just a sequence of numbers that represent the location and momentum of a particular atom or ion.

Calculation of quantum number.

It is given that, 2s2.

Here, 2 will be the principle quantum number.

Therefore, the first quantum number of 2s2 electron in phosphorus will be 2 which is principle quantum number.

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The reaction is not given here but we take an example reaction to understand how to calculate moles.

Let the balanced equation for the reaction is
C3H8 (g) + 5 O2 (g) → 3CO2 (g) + 4 H2O (g)

From here 5 moles of oxygen produces 3 moles of carbon dioxide

So 2.5 moles of oxygen produces 2.5/5 x 3 = 0.5 x 3 = 1.5 moles of carbon dioxide

Final answer:

Based on the combustion reaction 2 CO(g) + O₂(g) → 2CO₂(g), 2.5 moles of oxygen gas consumed would produce 5 moles of carbon dioxide.

Explanation:

When 2.5 moles of oxygen gas (O₂) are consumed in their reaction, to determine how many moles of carbon dioxide (CO₂) are produced, we need a balanced chemical equation. A common combustion reaction is 2 CO(g) + O₂(g) → 2CO₂(g), which indicates that for every mole of O₂ consumed, two moles of CO₂ are produced. Thus, if we consume 2.5 moles of O₂, we would typically produce 5 moles of CO₂, as the mole ratio is 1:2 between O₂ and CO₂.

You only need to know first is the vapor pressure of water at that boiling point which is ~ 179 mm hg.

 So the (vapor pressure of C2H5I = 760 – 179)

And since you know the molecular weight of H2O which is equal to18 g/mol and the molecular weight of C2H5I = 156 g/mol.

Just apply the equation: 

grams H2O M.W.      H2O × P H2O 

----------------------    = -------------------------- =  28.13 grams C2H5I 

grams C2H5I M.W.   C2H5I × P C2H5I

To determine the weight of ethyl iodide carried over by 1 g of steam during steam distillation, we need to calculate the mole fraction of ethyl iodide in the mixture and multiply it by the weight of the steam.

The boiling point of a solution can be determined using Raoult's law, which states that the vapor pressure of a solvent above a solution is equal to the product of the mole fraction of the solvent and the vapor pressure of the pure solvent. In this case, we are looking for the weight of ethyl iodide carried over by 1 g of steam during steam distillation. Since the mixture of ethyl iodide and water boils at 63.7°C, we know that the vapor pressure of ethyl iodide at 63.7°C is equal to the vapor pressure of steam at that temperature.

To determine the weight of ethyl iodide carried over by 1 g of steam, we need to calculate the mole fraction of ethyl iodide in the mixture. We can use the equation:

mole fraction of ethyl iodide = weight of ethyl iodide / weight of ethyl iodide + weight of water

Once we have the mole fraction of ethyl iodide, we can multiply it by the total weight of the steam (1 g) to find the weight of ethyl iodide carried over.

Answer:

29

Explanation:

Potassium is chemically similar to other Group 1 elements (Alkali metals) on the Periodic Table like Lithium, Sodium, Rubidium, Cesium, and Francium due to having comparable electron configurations.

Elements that are chemically similar to potassium are mainly those within the same group (Group 1) on the periodic table. These elements, known as the Alkali metals, have similar chemical behavior due to having one electron in their outermost shell. Examples include Lithium (Li), Sodium (Na), Rubidium (Rb), Cesium (Cs), and Francium (Fr).

This group of elements shares similar properties, such as being silvery and soft, and being highly reactive, especially with water. They also have comparable physical properties such as low densities and low melting points when compared to other metals.

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