Phosphorus is a common element that has a radioisotope that decays by emitting beta particles. the product is sulfur 32. the equation is :
³²P₁₅ -----> ³²S₁₆ + ⁰₋₁β
In the phosphorus beta decay the proton will converted in to neutron and electron. so. that the mass no. will be same but the atomic number increased by one.
The reaction is given as :
³²₁₅P ------> ᵃₙX + ⁰₋₁β
mass on product side = mass on product side
mass no a = 32
atomic no. on reactant side = atomic no. product side
15 = n - 1
n = 16
therefore the product is ³²S₁₆
Thus, Phosphorus is a common element that has a radioisotope that decays by emitting beta particles. the product is sulfur 32. the equation is :
³²P₁₅ -----> ³²S₁₆ + ⁰₋₁β
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What occurs when an electrolytic cell is used for silver-plating a spoon?(1) A chemical reaction produces an electric current.(2) An electric current produces a chemical reaction.(3) An oxidation reaction takes place at the cathode.(4) A reduction reaction takes place at the anode.Clear selection
2) An electric reaction produces a chemical reaction
The electrolytic cell uses the silver spoon as one of the electrodes where silver Ag+ is reduced into metallic silver covering the spoon with a layer of silver.
A gas composed of chlorine and oxygen has a density of 2.875 g/L at 754.5 mm Hg and 11°C. What is the most likely molecular formula of the gas?
The molecular formula of the unknown gas is ClO₂.
Let us consider that the gas composed of Chlorine and Oxygen is X. It is given that the density of the gas is 2.875g/L, the pressure of the gas is 754.5mmHg and the temperature is 11°C which is 284K.
From the kinetic theory of gases,
ρ = PRT/M
where M is the molar mass of the unknown gas X and R is the universal gas constant.
On substituting the values, we get
0.992763 = (2.875 x 0.0821 x 284)/M
M = 66.45174/0.992763
M = 67.52g/mol
Therefore, the molar mass of X is 67.52g/mol.
This molar mass value is equal to the molar mass value of ClO₂. Thus we could conclude that the molar mass of X is 67.52g/mol and the molecular formula of X is ClO₂.
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If 2.71 g of argon gas occupies a volume of 4.21 L, what volume will 1.29 moles of argon occupy under the same conditions?
The volume of argon gas will be, 79.68L .
Mass of argon (Ar) gas = 2.71 g
Molar mass of argon = 39.95 g/mole
Volume of argon gas = 4.21 L
Moles of neon (Ne) gas = 1.29 mole
First we have to calculate the moles of argon gas.
[tex]Moles of argon = \frac{mass\ of \ar}{molar \mass\ of \ ar}\\ \\Moles of argon = \frac{2.71}{39.95} \\\\Moles of argon = 0.0678 moles[/tex]
Now we have to calculate the volume of neon gas.
According to the Avogadro's law, the volume of gas is directly proportional to the number of moles of gas at same pressure and temperature. That means,
[tex]\frac{v_1}{v_2} =\frac{n_1}{n_2}[/tex]
where,
[tex]v_1[/tex] = volume of argon gas
[tex]v_2[/tex] = volume of argon gas
[tex]n_1[/tex] = number of moles of argon gas
[tex]n_2[/tex] = number of moles of argon gas
Now we put all the given values in this formula, we get
[tex]\frac{4.21}{v_2} = \frac{0.068}{1.29} \\\\v_2 = 79.86 L[/tex]
Therefore, the volume of argon gas will be, 79.68L .
What is molar mass ?The molar mass of a chemical compound is defined as the mass of a sample of the compound divided by the amount of the substance, which is the number of moles of the sample measured in moles. Molar mass is the volume of a substance, not a molecular property. Molar mass is the average of several occurrences of a compound, whose mass often varies due to the presence of isotopes. In most cases, molar mass is calculated from standard atomic masses and is thus a function of the Earth's average and the relative abundance of the Earth's atomic isotopes. Molar mass is suitable for converting between the mass of a substance and the amount of substance in bulk.
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spike is not a clone of his father he inherited dna from both of his parents Chromosomes are condensed units of dna if spike has 36 chromosomes you would expect that spike would have inherited
18 Chromosomes from his mother and 18 Chromosomes from his father.
If a spike has random chromosomes we would expect it to inherit 18 chromosomes from its father and 18 from its mother. All 36 chromosomes are arranged in two sets of chromosomes. Almost every cell in the human body has the same DNA. Most of the DNA is in the cell nucleus.
Must have a dominant allele to be considered a tastant hence Tt. Parents pass on traits such as eye color and blood type to their children through genes. Some health conditions and diseases can also be inherited genetically. Traits can take many forms. Bases are the parts of DNA that store information, giving DNA the ability to encode human phenotypes' visible characteristics. Adenine and guanine are purine bases.
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C
Next incorrect question
A Question 6 (1 point) Retake question
In an electrically neutral atom of any element, there are equal numbers of
atomic number and atomic mass,
electrons and neutrons.
electrons and protons.
protons and neutrons.
Equal numbers of protons and electrons.
An electron and a proton have the same quantity of charge, yet they are charged differently. As a result, an atom is said to be electrically neutral if it has an equal number of protons and electrons.
For instance, a neutral sodium atom has 11 protons and 11 electrons. This atom's electron is removed, resulting in a positively charged Na+ ion with a net charge of +1. More electrons in an atom result in a negative charge. For instance, a neutral chlorine atom has 17 protons and 17 electrons.
The number of electrons in an atom is always equal to the number of protons, even though heavier atoms typically have more neutrons than protons. As a result, an atom as a whole has no electrical charge. When an atom loses one or more electrons, it becomes positively charged.
An atom is said to be electrically neutral when its total charge is zero. Protons, which are positively charged, electrons, which are negatively charged, and neutrons, which are not positively or negatively charged, make up an atom.
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How many grams of
NaOH are required to
prepare 300. mL of a
0.350M solution?
(molar mass of NaOH =
40.0 g/mol)
4.2g of NaOH are required to prepare 300ml of a 0.350M solution.
Given,
the Molarity of the solution = M = 0.350M
molecular mass of NaOH = m = 40g
volume of solution = V = 300ml
weight of NaOH = w
According to the formula of Molarity,
M = (w×1000) /(m×V)
0.35M = (w ×1000) /(40×300)
w = (0.35×40×300) /1000
w = 4.2 g
Hence, 4.2g of NaOH are required to prepare 300ml of a 0.350M solution.
What is Molarity?The total number of moles of solute in a given solution's molarity is expressed as moles of solute per litre of solution. As opposed to mass, which fluctuates with changes in the system's physical circumstances, the volume of a solution depends on changes in the system's physical conditions, such as pressure and temperature. M, sometimes known as a molar, stands for molarity. When one gramme of solute dissolves in one litre of solution, the solution has a molarity of one. Since the solvent and solute combine to form a solution in a solution, the total volume of the solution is measured.
mathematically,
M = (w×1000) / (m×V)
where,
M = Molarity
m = mass of solute
V = volume
w = weight of the solute
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An empty container with a volume of 160.0 cm3 is weighed and found to have a mass of 72.1 g. The container is filled with a liquid and reweighed. The mass of the container and the liquid is 192.5 g. What is the density of the liquid to the appropriate number of significant figures?
Let us first define what density is. Density is defined as the mass of a substance that occupies a certain volume. It is described by the following equation:
[tex]\rho=\frac{Mass}{Volume}[/tex]Now, we have the volume of the liquid that will be equal to the volume of the container, that is, 160.0 cm3.
The mass of the liquid will be equal to the total mass (Container + Liquid) minus the mass of the container. The mass of the liquid is:
[tex]Mass=192.5g-72.1g=120.4g[/tex]Now, we substitute the value of mass and volume and find the density:
[tex]\begin{gathered} \rho=\frac{120.4g}{160.0cm^3} \\ \rho=0.7525g/cm^3 \end{gathered}[/tex]Answer: The density of the liquid is 0.7525 g/cm^3
A room is 3.5 m wide, 4.0 m long, and 3.0 m high. The pressure inside the room is 760. tort and th
temperature in the room is 27 °C
(a) (3 pts) What is the pressure in the room in atmospheres (atm)?
(a) The pressure in the room in atmospheres (atm) : 1 atm
What is atmospheric pressure ?Atmospheric pressure, also called atmospheric pressure, the force per unit area exerted by an atmospheric column (ie, the total mass of air over a given area). Atmospheric pressure can be measured with a mercury barometer (hence the common synonym barometric pressure), which indicates the height of a mercury column that exactly balances the weight of the air column relative to the barometer. Air pressure is also measured with an aneroid barometer
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A 0.2535 M solution of an unknown ionic compound is prepared by adding 5.259 g of the compound to a 125 mL volumetric flask and adding deionized water to the line. What is the molar mass of the ionic compound? Show your work and include the correct number of significant figures
Molarity is affected by temperature. Its unit is mole/litre. It measure the concentration of any solute in a solution. Thus the Molar mass is 166.4g/mol.
What is molarity?
Molarity can be calculated by dividing number of moles of solute by volume of solution in liter. Molarity is affected by temperature. Its unit is mole/liter. It measure the concentration of any solute in a solution.
Mathematically,
Molarity= number of moles of solute/volume of solution in liter (1)
Where,
moles= given weight÷ molecular weight
= 5.259 g÷ molecular weight
Substituting values in equation 1
0.2535 M =(5.259 g÷ molecular weight )÷(125÷1000)
molecular weight= 166.4g/mol
Thus the Molar mass is 166.4g/mol.
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1. A 20.00g sample of gold (molar mass = 196.97, Cp = 0.129 J/g C) at 500 Celsius is placed in a water bath of 300.00g at a temperature of 30.00 Celsius (molar mass = 18.02 g/mole, Cp= 4.18 J/g C). What is the temperature of the water after thermal equilibrium is obtained. You can assume no heat is lost in the process. No work no credit. (Show all equations used) 8 pts
The temperature of the water after thermal equilibrium is obtained is 30.97 °C
How do I determine the equilibrium temperatureFrom the question given above, the following data were obtained:
Mass of gold (M) = 20 gSpecific heat capacity of gold (C) = 0.129 J/gºC Temperature of gold (T) = 500 °CMass of water (Mᵥᵥ) = 300 gTemperature of water (Tᵥᵥ) = 30 °CSpecific heat capacity of the water = 4.18 J/gºC Equilibrium temperature (Tₑ) =?The equilibrium temperature can be obtained as illustrated below:
Heat loss = Heat gain
MC(T – Tₑ) = MᵥᵥC(Tₑ – Tᵥᵥ)
20 × 0.129 (500 – Tₑ) = 300 × 4.18(Tₑ – 30)
2.58(500 – Tₑ) = 1254(Tₑ – 30)
Clear bracket
1290 – 2.58Tₑ = 1254Tₑ – 37620
Collect like terms
1290 + 37620 = 1254Tₑ + 2.58Tₑ
38910 = 1256.58Tₑ
Divide both side by 1256.58
Tₑ = 38910 / 1256.58
Tₑ = 30.97 °C
Thus, the equilibrium temperature is 30.97 °C
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