What is the mass number of an atom having 16 protons and 13 neutrons?

The periodic table can be used to recall the ionic charge of alkali metals, alkaline earth metals, and aluminum by understanding the trends in the table.

You can use the periodic table to recall the ionic charge of an alkali metal, alkaline earth metal, or aluminum by understanding the trends in the periodic table. The alkali metals (group 1) have a 1+ charge, alkaline earth metals (group 2) have a 2+ charge, and aluminum (group 13) has a 3+ charge. The ionic charges are determined by the number of electrons lost by the element.

For example, sodium, an alkali metal, has an atomic number of 11. It loses one electron and forms a cation with a 1+ charge. Calcium, an alkaline earth metal, has an atomic number of 20. It loses two electrons and forms a cation with a 2+ charge. Aluminum, in group 13, has an atomic number of 13. It loses three electrons and forms a cation with a 3+ charge.

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To the prepared solution at  [tex]\rm 20^\circ C[/tex] the extra mass of x to be added to the solution at  [tex]\rm 30^\circ C[/tex] will be 4.44 g.

The complete question has given:

Solubility of x/100 g water at [tex]\rm 20^\circ C[/tex] = 11

Solubility of x/100 g water at [tex]\rm 30^\circ C[/tex] = 23

Now, since the saturated solution at [tex]\rm 20^\circ C[/tex]  will use 37 g of water. The mass of x in the saturated solution will be :

Mass of x =  [tex]\rm \dfrac{solubility\;of\;x\;\times\;mass\;of\;water}{100}[/tex]

Mass of x at [tex]\rm 20^\circ C[/tex] = [tex]\rm \dfrac{11\;\times\;37}{100}[/tex] g

Mass of x at [tex]\rm 20^\circ C[/tex]  = 4.07 g.

The mass of solute at [tex]\rm 30^\circ C[/tex] will be = [tex]\rm \dfrac{23\;\times\;37}{100}[/tex] g.

The mass of solute at[tex]\rm 30^\circ C[/tex]  = 8.51 g.

The extra mass of x to be added to the solution will be = 8.51 - 4.07 g.

The extra mass of x to be added to the solution will be 4.44 g.

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Answer: The name of the compound sodium oxide.

Explanation: Sodium is Na and its atomic mass is 22.99 amu. Oxygen is O and its mass is 16.00 amu. Na is a first group metal with one valence electron where as oxygen is a non metal with six valence electrons. Na loses one electron to get its nearest noble gas configuration and oxygen accepts two electrons to get its nearest noble gas configuration. So, the charge for Na is +1 and the charge for O is -2.

For each oxygen atom, two atoms of sodium are required. Hence, formula of the compound is [tex]Na_2O[/tex] and its name is Sodium oxide.

Formula mass = [2(22.99)+16.00]amu

= (45.98 + 16.00)amu

= 61.98 amu

11.2 moles of co2 are produced when 5.60 mole of ethane are burned in an excess of oxygen.

In chemistry, a standard scientific unit for measuring large quantities of very small entities such as atoms, molecules, or other specified particles.

The chemical reaction is given by :

2C₂H₆ + 7O₂ → 4CO₂ + 6H₂O

2 mole C₂H₆ - 4 mole CO₂

5.60 mole C₂H₆ - x

x=5.60*4/2=11.2 mole

Thus, 11.2 moles of co2 are produced when 5.60 mole of ethane are burned in an excess of oxygen.

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The balanced equation for the generation of sugar from sunlight water and CO₂ is

6 CO₂ + 6 H₂O → C₆H₁₂O₆ + 6 O₂

carbon dioxide + water → sugar + oxygen

The process of photosynthesis occurs when the chlorophyll present in the leaves of plants absorb sunlight to make food in the presence of carbon dioxide (enters through the stomata of leaves) and water (absorbed from the roots). As a result of this reaction sugar and oxygen is formed. After that sugar is converted in to starch and oxygen is released into air.

Photosynthesis is the biological process that transforms sunlight, water, and CO2 into glucose and oxygen. The balanced equation for photosynthesis is 6CO₂ + 6H₂O + light energy --> C6H12O6 + 6O2. The process includes intermediate reactions that eventually form simple carbohydrate molecules.

The process that generates sugar from sunlight, water, and CO2 is called photosynthesis. The balanced chemical equation for photosynthesis is 6CO₂ + 6H₂O + light energy --> C6H12O6 + 6O2.

During photosynthesis, plants use sunlight energy to convert carbon dioxide gas (CO2) and water (H2O) into glucose (C6H12O6) and oxygen (O2). This process is complex and involves intermediate reactions and products.

Glyceraldehyde-3-phosphates, which are simple carbohydrate molecules that can be converted to glucose and various other sugar molecules, are formed during the course of the reaction.

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Answer: The correct formula for phosphorous pentachloride is [tex]PCl_5[/tex] because a subscript 5 indicates five chlorine (Cl) atoms.

Explanation: For the given molecule, phosphorous pentachloride, there are 2 atoms present which are phosphorous and chlorine atoms.

Number of phosphorous atoms = 1

Number of chlorine atoms = 5

So, the correct formula for phosphorous pentachloride will be [tex]PCl_5[/tex] because the subscript 5 represents the 5 chlorine atoms.

The correct formula for phosphorus pentachloride is PCl₅. Therefore, option B is correct.

In the compound, phosphorus has a valence of +5, meaning it can form up to five bonds. Each chlorine atom has a valence of -1, allowing it to form a single bond.

By combining one phosphorus atom with five chlorine atoms, each chlorine atom can share one electron with the phosphorus atom, resulting in the formation of five P-Cl bonds.

In the compound, "penta" indicates that there are five chloride (Cl) atoms bonded to the central phosphorus (P) atom. The subscript of 5 in PCl5 represents the number of Cl atoms bonded to each P atom.

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The concentration of Na ion in the final solution is 0.66 M.

To calculate the concentration of Na ions in the solution, the moles of [tex]\rm Na_2SO_4[/tex] in the solution have been calculated.

Moles = molarity [tex]\times[/tex] volume (L)

The molarity of [tex]\rm Na_2SO_4[/tex] solution given is = 0.4

Volume of [tex]\rm Na_2SO_4[/tex] solution = 100 ml = 0.1 L.

Moles of [tex]\rm Na_2SO_4[/tex] = 0.4 [tex]\times[/tex] 0.1

Moles of [tex]\rm Na_2SO_4[/tex] = 0.04

The dissociation of [tex]\rm Na_2SO_4[/tex] will be as follows:

[tex]\rm Na_2SO_2\;\rightarrow\;2\;Na^+\;+\;SO_4^2^-[/tex]

1 mole of [tex]\rm Na_2SO_4[/tex] = 2 moles of Na ions.

0.04 moles of [tex]\rm Na_2SO_4[/tex] = 0.04 [tex]\times[/tex] 2

0.04 moles of [tex]\rm Na_2SO_4[/tex] = 0.08 moles of Na ions.

The moles of Na ions in NaCl solution will be:

Given, molarity of NaCl solution = 0.6 M

Volume of NaCl solution = 200 ml = 0.2 L.

Moles of Na ions in NaCl solution = 0.6 [tex]\times[/tex] 0.2

Moles of Na ions in NaCl solution = 0.12.

The dissociation of NaCl will be as follows:

[tex]\rm NaCl\;\rightarrow\;Na^+\;+\;Cl^-[/tex]

1 mole of NaCl = 1 mole of Na ions

0.12 moles of NaCl gives = 0.12 moles of Na ions.

Thus the total Na ions = Na ion in [tex]\rm Na_2SO_4[/tex] + Na ions in NaCl

Total moles of Na ions = 0.08 + 0.12

Total moles of Na ions = 0.2 moles.

The total volume of solution will be :

0.1 L [tex]\rm Na_2SO_4[/tex] + 0.2 L NaCl

= 0.3 L.

Concentration of Na ion in the final solution = [tex]\rm \dfrac{moles}{volume\;(L)}[/tex]

The concentration of Na ion in the final solution =  [tex]\rm \dfrac{0.2}{0.3}[/tex] M

Concentration of Na ion in the final solution = 0.66 M.

The concentration of Na ion in the final solution is 0.66 M.

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The pH range of acid is between 0-7 on pH scale while for base pH range is from 7-14. pH is a unitless quantity. The relationship between pH and hydrogen ions is pH=-log[H⁺].

pH is a measurement of amount of hydronium ion H₃O⁺ in a given sample. More the value of hydronium ion concentration, more will be the solution acidic. pH scale used to determine pH of a solution.

Mathematically the relation between hydrogen ion and pH is given as

pH=-log[concentration of hydrogen ion]

pH=-log[H⁺]

On subtracting pH from 14, we get pOH which measures the concentration of hydroxide ion in a given solution. pH depend on the temperature. At room temperature pH scale is between 0 to 14. pH of neutral solution is 7.

Therefore, the relationship  between pH and hydrogen ions is pH=-log[H⁺].

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Answer: Option (a) is the correct answer.

Explanation:

Atomic number means the sum of total number of protons acquired by an atom.

So, when atomic number of nitrogen is 7 then it means there are 7 protons present.

Whereas atomic mass means the sum of total number of protons and neutrons present in an atom.

Therefore, nitrogen-15 is an isotope of nitrogen that will always have 7 protons when it is neutral in nature. Hence, in nitrogen-15 the number of protons and neutrons are calculated as follows.

                   Atomic mass = no. of protons + no. of neutrons

                             15 = 7 + no. of neutrons

                    no. of neutrons = 15 - 7

                                               = 8

Thus, we can conclude that the atomic nucleus of nitrogen-15 contains 8 neutrons.

Atomic number is the number of protons in an element. Mass number is the total number of protons and neutrons in an element. Thus, to get the number of neutrons in an element, one can subtract the atomic number of an element from the mass number.

Since Nitrogen has an atomic number of 7, the number of neutrons in nitrogen with a mass number of 14 is 14 - 7 = 7 neutrons

The number of neutrons in nitrogen with a mass number of 15 is 15 -7 = 8 neutrons

Thus, the answer to the question is 8 neutrons.

Note: Nitrogen-14 means nitrogen with a mass number of 14 while nitrogen-15 means nitrogen with a mass number of 15

The half-life of a radioisotope that decayed from 0.5 g to 0.125 g in 9.6 min is 4.8 minutes, calculated by recognizing that two half-lives have occurred within the given timeframe.

The question concerns the calculation of the half-life of a radioisotope based on the amount of material that remains after a certain period of time. The half-life is the time taken for half of the radioactive nuclei in a sample to decay. To determine the half-life, we can apply the formula for exponential decay:

N(t) = N(0) * (1/2)^(t/T)

Where:

N(t) is the remaining quantity of the substance after time t,

N(0) is the initial quantity of the substance,

t is the time that has passed,

T is the half-life of the substance.

In this case, we start with 0.5 g and end with 0.125 g after 9.6 minutes. Since two half-lives have passed to get from 0.5 g to 0.125 g (0.5 g -> 0.25 g -> 0.125 g), we can calculate the half-life as:

9.6 minutes / 2 = 4.8 minutes

Therefore, the half-life of the radioisotope is 4.8 minutes.

Answer:

Calcium chloride

Explanation:

Colligative  property depends upon number of particles. The colligative property is independent of the nature of solute present in a solution.

More the number of particles larger the colligative property.

The following are colligative property

a) depression in freezing point

b) elevation in boiling point

c) relative lowering of vapor pressure

d) osmotic pressure

Thus if we wish to melt the we will take calcium chloride as it will give more number of ions per molecules as compared to sodium chloride.

In Ba(NO3)2, the ratio of barium ions (Ba²⁺) to nitrate ions (NO₃⁻) is 1:2. This is because each formula unit of this compound contains one Ba²⁺ ion and two NO₃⁻ ions.

In a sample of solid Ba(NO3)2, the ratio of barium ions (Ba²⁺) to nitrate ions (NO₃⁻) is 1:2. This is because in each formula unit of Ba(NO3)2, there is one Ba²⁺ ion and two NO₃⁻ ions.

The subscript '2' after NO₃ in the formula indicates that two nitrate ions are associated with every one barium ion in this compound. Hence, for every single barium ion, there are two nitrate ions.

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A phase diagram is a temperature vs pressure plot from which the phase of a compound can be deduced under the given temperature and pressure conditions. The 3 equilibrium curves: Solid-Gas, Liquid-Gas and Solid-Liquid separate the compound into the three states of matter. The 3 states can however coexist at a unique point referred to as the triple point.

Based on the phase diagram for CO2 (which is readily available online), at -70 C and 5.5 atm, CO2 exist as a solid.

Answer: coefficient for aluminum is 2.

Explanation:

According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.

The skeletal equation is:

[tex]Al+FeS\rightarrow Al_2S_3+Fe[/tex]

The balanced equation for single displacement reaction is:

[tex]2Al+3FeS\rightarrow Al_2S_3+3Fe[/tex]

Thus the coefficient for aluminum when the chemical equation is balanced is 2.

The vapor pressure is EQUAL TO the outside air pressure.

Answer: Option (c) is the correct answer.

Explanation:

In an open system, the vapor pressure is equal the outside air pressure because there can be mass transfer or energy transfer from the atmosphere to the system as the system is open.

Whereas in a closed system there cannot be mass transfer or energy transfer from the system to the surrounding or vice versa.

Thus, we can conclude that option (c) is the correct answer.

Final answer:

Two different compound samples consisting of the same elements but in different proportions are different compounds. They exemplify the Law of Multiple Proportions, with the specific mass ratios indicating the identity of the compounds.

Explanation:

If two compound samples are composed of the same elements but in different proportions, we can conclude that these are different compounds. This observation is encompassed by the Law of Multiple Proportions which states that when two elements combine to form more than one compound, they do so in ratios of small whole numbers. For instance, carbon and oxygen can form carbon monoxide (CO) with a ratio of 1:1 and carbon dioxide (CO2) with a ratio of 1:2. Therefore, the different mass ratios indicate different compounds altogether, each with unique properties.

The example given in the question shows compound A with a carbon to oxygen mass ratio of approximately 1:1.33, and compound B with a ratio of approximately 1:2.66, suggesting that compound B contains twice as many oxygen atoms per carbon atom compared to compound A. This could indicate that compound A is carbon monoxide and compound B is carbon dioxide, illustrating the Law of Multiple Proportions.

There are various kind of elements that are present in periodic table. Some elements are metals, some are non metals, some are metalloids. Therefore, the activity series of metals compares the strength of reactivity of metals.

Metals are those elements which is hard, conduct electricity, ductile, lustrous and malleable.

Lets take property

1.Since metals have free electrons that's why they can conduct electricity

2. Since atoms in metals are very closely packed in a definite crystal solid. It is not brittle that is it can not be broken down easily.

3. It does not react with water.

4.It is denser than water hence it sink in water.

The activity series of metals compares the strength of reactivity of metals.

Therefore, the activity series of metals compares the strength of reactivity of metals.

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Answer:

require only one electron to complete their outer shell

have a high electronegativity

Explanation: