Answer:
262
Explanation:
determine the number of significant figures in each of the following numbers.1.) 32.05 =2.) 36541 =3.) 300,012,345 =4.) 36,000 =5.) 100 =6.) 100.0 =7.) 1,0000 =8.)250 =9.) 250. =10.) 407 =
we are required to determine the significant figures in each of the numbers.
1) 4 significant figures
2) 5 significant figures
3) 9 significant figures
4) 5 significant figures
5) 3 significant figures
6) 4 significant figures
7) 5 significant figures
8) 3 significant figures
9) 3 significant figures
10) 3 significant figures
you find the density of an object 4 times 1.3g/ml 1.25g/ml 1.17g/ml and 1.22g/ml now determine the percent deviation from the mean
Firstly we will determine the average or the mean of the objects density:
[tex]\begin{gathered} Mean=\frac{1.3g•mL^{-1}+1.25g•mL^{-1}+1.17g•mL^{-1}+1.22g•mL^{-1}}{4} \\ Mean=\frac{4.94g•mL^{-1}}{4} \\ Mean=1.235 \end{gathered}[/tex]Now we will calculate the deviation. The deviation is how much is trial is different from the average. We take the absolute value so the answers can be positive:
[tex]\begin{gathered} Trial\text{ }1:|1.3-1.235|=0.065 \\ Trial\text{ }2:|1.25-1.235|=0.015 \\ Trial\text{ }3:|1.17-1.235|=0.065 \\ Trial\text{ }4:|1.22-1.235|=0.015 \end{gathered}[/tex]We will determine the average of the deviation:
[tex]\begin{gathered} Deviation\text{ }mean=\frac{0.065+0.015+0.065+0.015}{4} \\ Deviation\text{ }mean=0.04 \end{gathered}[/tex]To determine the percent deviation we:
[tex]\begin{gathered} \%\text{ }deviation=\frac{mean\text{ }deviation}{mean}\times100 \\ \\ \%\text{ }deviation=\frac{0.04}{1.235}\times100 \\ \\ \%\text{ }deviation=3.24\% \end{gathered}[/tex]Answer: The percent deviation from the mean is 3.24%,
A 0.15M solution of methylamine CH3NH2 contains an unknown concentration of methylamine chloride CH3NH3Cl. If the solution has a pH of 10.20,what is the concentration of methylamine chloride in the solution? Kb for methylamine =4.6*10^-4
The concentration of methylamine chloride in the solution is 0.44 M.
given that :
concentration of methylamine , [ base ] = 0.15 M
pH = 10.20
pH + pOH = 14
pOH = 14 - pH = 14 - 10.20 = 3.8
Kb = 4.6 × 10⁻⁴
concentration of methylamine chloride , [ acid ] = ?
The equation of POH is given by the following formula :
POH = pKb + log [ acid ] / [ base ]
pkb = -log kb
pkb = - log ( 4.6 × 10⁻⁴ )
pkb = 3.33
now, substituting the values, we get:
POH = pKb + log [ acid ] / [ base ]
3.8 = 3.33 + log [ acid ] / [ 0.15 ]
0.47 = log [ acid ] / [ 0.15 ]
10^0.47 = [ acid ] / [ 0.15 ]
2.95 = [ acid ] / [ 0.15 ]
[ acid ] = 0.44 M
Thus, A 0.15M solution of methylamine CH3NH2 contains an unknown concentration of methylamine chloride CH3NH3Cl. If the solution has a pH of 10.20,what is the concentration of methylamine chloride in the solution is 0.44 M.
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the atomic number of an atom is the number of _____ in its nucleus and is equal to the number of ____ if the atom is not charged
Answer:
first blank: protons
second black: electrons
Explanation:
The combustion of liquid ethanol (C2H, OH)produces carbon dioxide and water. After 5.8 mLof ethanol (density = 0.789 g/mL) was allowed toburn in the presence of 12.5 g of oxygen gas, 3.10mL of water (density = 1.00 g/mL) was collected.
Answer
Explanation
Given data:
Fill in the Blanks
Type your answers in all of the blanks and submit
- current answer: When solid potassium chlorate is heated in the laboratory it decomposes to form potassium chloride and oxygen. Consider this reaction to answer the questions below: When properly balanced the sum of the coefficients for this reaction = - 7 -. When you decompose 71.7 grams of potassium chlorate you can form a maximum of - blank2 -grams of potassium chloride and - blank3 -grams of oxygen.
When solid potassium chlorate is heated in the laboratory it decomposes to form potassium chloride and oxygen.
Consider this reaction to answer the questions below:
When properly balanced the sum of the coefficients for this reaction =
blank1 - Word Answer
7
.
When you decompose 71.7 grams of potassium chlorate you can form a maximum of
blank2 - Word Answer
Please type your answer to submit
grams of potassium chloride and
blank3 - Word Answer
grams of oxygen.
There is 1 error to address before submitting
Unanswered1 attempt left
Submit
Answer:
The correct answer is option C. Slavery is a degrading institution to all those involved. Explanation: As Douglass narrates, slavery not only degrades slaves, but slavers asWhich of the following sentences best describes Douglass’s opinion about slavery?
Calculate the wavelength and energy of light that has a frequency of 1.1 * 10^17 Hz
The wavelength and the energy would be 2.72 × 10⁻⁹ meter 6.886 × 10⁻¹⁷ Joules and respectively if the light has s a frequency of 1.1 × 10¹⁷ Hz.
What is Wavelength?It can be understood in terms of the distance between any two similar successive points across any wave.
C = λν
As given in the problem we have to calculate the energy of the light if the frequency of light is 1.1 × 10¹⁷ Hz
The wavelength of the light = 3 × 10⁸ / 1.1 × 10¹⁷
= 2.72 × 10⁻⁹ meter
The energy of the light = h ν
= 6.26 × 10⁻³⁴ × 1.1 × 10¹⁷
= 6.886 × 10⁻¹⁷ Joules
Thus, the wavelength and the energy would be 2.72 × 10⁻⁹ meter 6.886 × 10⁻¹⁷ Joules and respectively if the light has s a frequency of 1.1 × 10¹⁷ Hz.
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A reaction experimentally yields 15.68 g of a product. What is the percent yield if the theoretical yield is 18.81 g?
Answer
The percent yield = 83.36%
Explanation
Given:
Experimental yield = actual yield = 15.68 g
Theoretical yield = 18.81 g
What to find:
The percent yield for the reaction.
Step-by-step solution:
The percent yield for the reaction can be calculated using the formula below:
[tex]\begin{gathered} Percent\text{ }yield=\frac{Actual\text{ }yield}{Theoretical\text{ }yield}\times100\% \\ \\ Percent\text{ }yield=\frac{15.68\text{ }g}{18.81\text{ }g}\times100\% \\ \\ Percent\text{ }yield=83.36\% \end{gathered}[/tex]Hence, the percent yield for the reaction is 83.36%
a sample of argon has a volume of 4.95 L and the pressure is 0.92 atm if the final temperature is 30 C the final volume is 5.7 L and the final pressure is .092 atm what was the initial temperature of the argon
The initial temperature of the argon is 2678 K
Given that,
Initial volume (V1) = 4.95 L
Initial pressure (P1) = 0.92 atm
Final temperature (T2) = 30 C = 303.15 K
Final volume (V2) = 5.7 L
Final pressure (P2) = 0.092 atm
We need to find the Initial temperature of the argon represented as T1
We Know that, In ideal gas law: PV = nRT
It can be written as, P1V1 / T1 = P2V2 / T2
(0.92 * 4.95) / T1 = (0.092 * 5.7) / 303.15
4.554 / T1 = 0.5244 / 303.15
4.554 / T1 = 0.0017
T1 = 4.554 / 0.0017
T1 = 2678 K
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For the following equations you will be given the names of reactants and products. In the space below each reaction provide theformulas of each reactant and product along with coefficients.
Explanation:
First, let's write the formulas:
Potassium chlorate: KClO3
Oxygen: O2
Potassium chloride: KCl
So the reaction will be:
KClO3 -> O2 + KCl
Now let's balance it.
To balance the equation it is necessary to have the same number of atoms of each element on both sides of the equation (reactant side and product side). Let's count the number of atoms of each element for the unbalanced equation: KClO3 -> O2 + KCl
Reactant side:
K - 1
Cl - 1
O - 3
Product side:
O - 2
K - 1
Cl - 1
As you can see, oxygen number of atoms is not equal on both sides of the equation. Let's balance it by changing the stoichiometric coefficient.
2KClO3 → 2KCl + 3O2
Let's count the number of atoms of each element for the balanced equation.
Reactant side:
K - 2
Cl - 2
O - 6
Product side:
K - 2
Cl - 2
O - 6
Now the equation is balanced.
Answer: 2KClO3 → 2KCl + 3O2
Coefficients are: 2, 2 and 3.
I believe the incorrect statement is dissolution of oxygen in water is due to dipole- induced dipole interaction.
For this question we have 4 options and relates a few chemical concepts, let's analyze each option and reach a final conclusion:
A. Since in a geometric 3-D point of view, neopentane is more closely together in its bondings, the boiling point will be lower in it, and n-pentane has more surface to be heated, therefore the boiling and melting point will be higher, as it is proven experimentally, n-pentane = 36.1°C, neopentane = 9.5°C. Correct
B. If we have O2 being thrown in water, the covalent bonding between these two atoms is very nonpolar and weak, the weak Van der Waals force, also known as temporary dipole-induced dipole interactions. Correct
C. Dipole moment has a lot to do with the strength of a bond, greater the dipole moment, the stronger the bond will be, and if we have a strong bond, more energy will be required to break, therefore higher the boiling and melting point will be for these compounds, therefore this one is Incorrect
D. Yes, in DNA the main type of intermolecular force is Hydrogen bonding
In paragraph format explain how the energy from Sun gets heats the water in tank. The explanation is based on the concept of atoms (or particles) of matter and the heat transfer (conduction, convection and radiation)
The energy from the sun heats up the water in the tank by convection and radiation.
What is heat transfer?We know that heat is that which is able to effect a temperature change in an object. Now, we know that there are three forms of heat transfer and these are;
1) Conduction
2) Convection
3) Radiation
Now, we know that radiation is the movement of heat without a medium of propagation. Heat from the sun reaches the tank by radiation. The molecules that are at the surface are first heated up and sink down while the heavier particles below move up. This is called convection.
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Express the following in liters at STP:
4.83 x 10^-3 moles HF
Considering the definition of STP conditions, 4.83 × 10⁻³ moles of HF will occupy a volume of 0.108192 L at STP.
STP conditionsThe STP conditions refer to the standard temperature and pressure. Pressure values at 1 atmosphere and temperature at 0 ° C are used and are reference values for gases, and 1 mole of any gas occupies an approximate volume of 22.4 liters.
Volume in this caseIn this case, you have 4.83×10⁻³ moles of HF. You can apply the following rule of three: if by definition of STP conditions 1 mole of HF occupies a volume of 22.4 liters, 4.83×10⁻³ moles occupies how much volume?
volume= (4.83×10⁻³ moles ×22.4 L)÷ 1 mole
volume= 0.108192 L
Finally, there is a volume of 0.108192 L at STP.
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What is the electronic configuration of argon
Electronic configuration: this shows us the distribution of electrons in an atom. The chart below helps us find the electron configuration.
How many protons does argon have?
Argon has 18 protons.
The electronc configuration of argon is 1s2 2s2 2p6 3s2 3p6
Chen has a toy car and wants to find out which surface will allow the car to move the fastest. He plans to push the car on carpet, wood, and bricks. predict which surface the toy car will move the fastest on and why
Answer:
The car will most likely move the fastest on the wood. Carpet will create drag due to the friction between the car's wheels and the carpet. Bricks are not smooth so drag will occur, however it will be minimal. Wood is usually smooth and there is almost no drag or friction...the car will glide easily over the surface.
Explanation:
Hope this helps!!
A NaOH solution contains 26.0 g of NaOH, and it’s concentration is 1.3M. What is its volume?
Answer
Volume = 0.5 L
Explanation
Mass of NaOH = 26.0 g
Molarity = 1.3 M
Molar mass of NaOH = 39.997 g/mol
Volume = ?
The volume of NaoH can be calculated using
[tex]\begin{gathered} V=\frac{n}{M} \\ \text{Where;} \\ V\text{ is the volume} \\ n\text{ is the number of mole of NaOH} \\ \text{M is the Molarity} \end{gathered}[/tex]But the number of mole of NaOH, n = mass of NaOH / Molar mass of NaOH
[tex]\Rightarrow n=\frac{26.0\text{ g}}{39.997\text{ g/mol}}=0.65\text{ mole}[/tex]Therefore, the volume of NaOH is
[tex]V=\frac{0.65}{1.3}=0.50\text{ L}[/tex]Calculate the boiling point of a 0.33 m solution of a solute in benzene.
(Kb = 2.53°C /m).
We can see that the solution has a boiling point of 80.93°C.
What is the boiling point?The atmospheric pressure does equal the pressure of a liquid as we heat the system. The temperature at which this occurs is called the boiling point. Now we know that the boiling point of the pure benzene is 80.1 °C.
Given that;
ΔT = K m i
ΔT = boiling point elevation
K = boiling point constant
m = molality of the solution
i = Van Hoff factor (molecular solute)
ΔT = 2.53°C /m * 0.33 m * 1
ΔT = 0.83°C
The boiling point of the solution is now gotten from ; 0.83°C + 80.1 °C
= 80.93°C
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What is the energy of a purple
lamp with a frequency of
7.5 x 10^14 Hz
Answer:
[tex] \huge{4.969 \times {10}^{ - 19} \:J }[/tex]
Explanation:
The energy of the purple lamp can be found by using the formula
E = hf
where
E is the energy
f is the frequency
h is the Planck's constant which is
6.626 × 10-³⁴ Js
From the question.
[tex] f = 7.5 \times 10^14 \: Hz [/tex]
We have.
[tex] E = 6.626 \times 10^{-34} \times 7.5 \times 10^{14} [/tex]
We have the final answer as
[tex]4.969 \times {10}^{ - 19} \: J[/tex]
A solution is made by dissolving4.87 g of potassium nitrate in waterto a final volume of 86.4 mL solution.What is the weight/weight % orpercent by mass of the solute?Use 1.00 g/mL for the density of the solution.Enter text here
Answer
The weight/weight % of solute = 5.3%
Explanation
Given
Mass of solute (potassium nitrate) = 4.87 g
Volume of solvent (water) = 86.4 mL
Density of water = 1.00 g/mL
Required: Weight/weight% of the solute
Solution
Step 1: Covert the volume of water to mass
mass = density x volume
mass = 1.00 g/mL x 86.4 mL
mass = 86.4 g
Step 2: Calculate the weight/weight % of the solute
Mass % solute = [mass of solute/(mass of solute + mass of solvent)] x 100
Mass % solute = 4.87g/(4.87 + 86.4)
Mass % solute = 5.3%
Please help
For this assignment, you will create a public service
announcement, or a PSA, describing the environmental
and economical impact of the end-products of
chemical reactions of those that may result in the
greenhouse effect or ozone depletion.
Items you must include or address:
• describe the chemical reaction
occurring using a
chemical equation and identifying the reactants
and products.
• demonstrate how mass/matter is conserved
during this chemical reaction.
• describe the energy changes that accompany this
chemical reaction.
• describe how the end-products affect the
environment.
• describe the economical impact.
provide ways for anyone to help reduce the
environmental impacts.
I need to be a letter to your senator
The assignment about the Public Service Announcement (PSA) describing the environmental impacts due to ozone depletion and the greenhouse effect is given below.
Since we live in a modern industrialized world, we need to get exposed to lots of chemicals and pollutants. With modernization people began to use Air conditioners, Refrigerants, and other household appliances for a sophisticated lifestyle without knowing the harmful effects it causes on the environment.
The use of Refrigerators and Air Conditioners contains Freons which are used as aerosol propellants. These freons release CFCs which are called as Chloro-Fluro-Carbons which are the main element responsible for damaging the environment by causing both global warming and Ozone depletion.
The Chlorine atom that is released from the CFCs breaks the bond of the Ozone. The reaction is elucidated below:
ClO + O -------> Cl + O₂
This breaks the bond of Ozone creating Ozone depletion and eventually leading to Global Warming.
Similar to Ozone depletion, another main environmental problem is the greenhouse effect which is occurring mainly due to the release of harmful gases from automobiles, and industries such as CO₂, SO₂, etc... These gases absorb and trap the solar heat from the Infrared region and creates a greenhouse effect. These gases are called greenhouse gases.
This greenhouse effect, ozone depletion eventually leads to an increase in global temperature and results in the rising of sea levels by melting the glaciers and icebergs. The climatic pattern is adversely affected. This would affect agriculture, as well as the health of humans as harmful UV rays that enter the earth due to ozone depletion, will lead to skin diseases, cancer, and so on.
By adversely affecting the agriculture and health of the world, there would be a drop in the entire economy as our country is dependent mainly on agriculture for the nation's economy.
The effects of these could be minimized by using public transport, planting trees, using refrigerators and air conditioners free from freons, and proper treatment of the wastes eliminated from industries must be ensured.
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Which state of matter is being described below?It cannot be squashed easily, will not spread out & is high densityA. GasB. SolidC. LiquidD. Plasma
There are 3 main states of matter: gas, solid, and liquid.
The solid is characterized by its rigid structure, its high density (it means that's there's a lot of mass per unit of volume). Also, it doesn't take the container's shape as a liquid does.
Then, the description corresponds to the solid state (option B).
A reaction between liquid reactants takes place at 28.0 degree celcuis in a sealed, evacuated vessel with a measured volume of 15.0L. Measurements show that the reaction produced 10.0g of dinitrogen difluoride gas.
Calculate the pressure of dinitrogen difluoride gas in the reaction vessel after the reaction. You may ignore the volume of the liquid reactants. Round your answer to 2 significant digits.
The pressure of N2F2 will be 1.64 atm.
Given data:
Mass of N2F2 = 66 grams
Molar mass of N2F2 = 66 g/mol
Temperature = 28°C = 273 +28 = 301 Kelvin
volume = 15 L.
Gas constant = 0.08206 L*atm/K* mol
Number of moles can be determined by using the formula:
Number of moles = mass of N2F2 / Molar mass of N2F2
Number of moles = 66 g/ 66 g/mol = 1 moles.
Volume can be determined by using the formula:
P*V = n×R×T
where, P is pressure, V is volume, T is temperature.
P = (n×R×T)/ V
P = 1 * 0.08206 * 301 )/15 = 1.6466 atm.
The pressure of the sulfur tetrafluoride gas is 1.64 atm.
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How do you calculate mass of a known substance (sodium chloride for example) given its amount in terms of moles? O multiply moles by the molar mass O divide moles by the molar mass O cannot be determined based on the given divide the molar mass by the Avogadro's number
1) List the known and unknown quantities.
Amount of substance: moles
mass: grams
2) Set the equation.
[tex]Molar\text{ }Mass=\frac{Mass\text{ }(grams)}{Amount\text{ }of\text{ }substance\text{ }(moles)}[/tex][tex]Molar\text{ }Mass\ast Amount\text{ }of\text{ }substance\text{ }(moles)=Mass\text{ }(grams)[/tex]If we have the number of moles of a compound, we have to multiply it by the molar mass to find the mass.
Answer: multiply moles by the molar mass.
.
How many coulombs of charge are needed to produce 53.5 mol of solid zinc?
The charge of 10,325,500 coulombs is needed to produce 53.5 mol of solid zinc.
What is the coulomb charge?The coulomb is the unit of electric charge in the International System of units and is represented by 'C'. In the S.I., it is equal to the electric charge delivered by a 1-ampere constant current in 1 second and to elementary charges, about 6.2×10¹⁸ e.
The coulomb in terms of the ampere and second can be described as 1 C = 1 A × 1 s. The SI base units fixed the numerical value of the elementary charge expressed in coulombs.
Solid zinc can be formed by chemical reactions:
Zn²⁺ + 2e⁻ → Zn (s)
One mole of zinc is produced by using two moles of electrons.
One mole of electrons is equal to one faraday electricity.
Then, the total electrons required = 2×53.5 = 107 F
The charge (in coulombs) on one mole of electrons = 96500 C
Amount of charge required to form zinc = 96500 × 107 = 10,325,500 C
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In Peft A, we saw that the theoretical yield of aluminum oxide is 1.50 mol. Calculate the percent yield if the actual yield ofaluminum oxide is 0.885 mol .Express your answer with the appropriate units.D View Available Hint(s)
Explanation:
The theoretical yield of our reaction is 1.50 moles, the actual yield of aluminum oxide is 0.885 moles. The percent yield is:
percent yield = actual yield/theoretical yield * 100 %
percent yield = 0.885 moles/(1.50 moles) * 100 %
percent yield = 59.0 %
Answer: The percent yield is 59.0 %.
How is percent composition related to alkene stability?
The stability of alkene can be determined by measuring the amount of energy that is associated with the hydrogenation of the molecule.
What is alkene stability?Because those branched alkanes are more stable than their linear isomers (Figure 1), the origins of this stability are unclear. For each branch in an alkane, the measured heat of formation is lower than expected by about 2 kcal mol−1 in comparison to the linear isomer. The fullness structures in which all atoms have complete valence shells are more stable. The structures with the least number of ritual charges are more stable. The structures with a negative charge on the further electronegative atom will be more stable. The three main factors determining the relative stability of alkenes are i) the number of substituents attached to the double-bond carbon atoms, ii) hyperconjugation, and iii) the stereochemistry of the double bond.
So we can conclude that the more electron-donating alkyl groups are the more stable the alkene
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6. Initially, a sample of nitrogen gas is found in a pressure of 4.62 atm under the temperature of 27.0℃. Find the change in temperature of the gas when the pressure is increased to 5.59 atm.
Answer: ΔT = 62.98
Explanation:
This can be done using Gay Lusac's Law which states that Pressure is proportional to temperature
So, we take p1 = 4.62 atm, t1 = (27+273)°K, p2 = 5.59 atm, t2=?
now, P1/T1 = P2/T2
From here find out T2 which would be in Kelvin and then subtract 273 to convert it into celsius. Then find the difference between T1 and T2 and you should have your answer.
Using the Mole: Empirical Formulas, Molecular Formulas, % Composition5. Potassium persulfate was used in photography to remove the last traces of hypo from photographic papers and plates, A 0,8162 g sample was found to contain 0,2361 g of potassium, 0.1936 g of sulfur, and the rest was oxygen. The formula weight of this compound was measured to be 270. What are the empirical and molecular formulas of this compound?
Answer:
Molecular formula = KSO4.
Empirical formula = K2S2O4.
Explanation:
What is given?
Mass of K (potassium) = 0.2361 g.
Mass of S (sulfur) = 0.1936 g.
Mass of O (oxygen) = 0.8162 g - 0.2361 g - 0.1936 g = 0.3865 g.
Molar mass of K = 39.1 g/mol.
Molar mass of S = 32 g/mol.
Molar mass of O = 16 g/mol.
Weight of compound = 270 g/mol.
Step-by-step solution:
Remember that empirical formulas show the simplest whole-number ratio of atoms in a compound, and molecular formulas show the number of each type of atom in a molecule. So first, let's see what would be the molecular formula:
Let's find the number of moles of each element using its molar mass:
[tex]\begin{gathered} 0.2361\text{ g K}\cdot\frac{1\text{ mol K}}{39.1\text{ g K}}=0.006038\text{ moles K,} \\ 0.1936\text{ g S}\cdot\frac{1\text{ mol S}}{32\text{g S}}=0.006050\text{ moles S,} \\ 0.3865\text{ g O}\cdot\frac{1\text{ mol O}}{16\text{ g O}}=0.02416\text{ moles O.} \end{gathered}[/tex]The next step is to divide each number of moles obtained by the least number of moles, in this case, the least number is 0.006038:
[tex]\begin{gathered} 0.006038\text{ moles K/0.006038=1 mol K,} \\ 0.006050\text{ moles S/0.006038 =}1.001\text{ moles S}\approx1\text{ mol S,} \\ 0.02416\text{ moles O/0.006038=4.001 moles O}\approx\text{4 moles O.} \end{gathered}[/tex]Our molecular formula would contain 1 mol of K, 1 mol of S, and 4 moles of O, so it would be KSO4.
But remember that we need to find the empirical formula too, based on the molecular weight. In the statement, they're telling us that the molecular weight is 270 g/mol, but the molecular weight of KSO4 is 135 g/mol (you can calculate it using the given molar masses and by doing an algebraic sum). So, to obtain the empirical formula with 270 g/mol as molecular weight, we have to multiply by two each number of moles of the compound (135 g/mol * 2 = 270 g/mol):
[tex]\begin{gathered} 1\text{ mol K}\cdot2=2\text{ moles K,} \\ 1\text{ mol S}\cdot2=2\text{ moles S,} \\ 4\text{ moles O }\cdot2=8\text{ moles O.} \end{gathered}[/tex]So, you can realize that K2S2O4 would be the empirical formula because its molecular weight would be 270 g/mol.
Molecular formula = KSO4.
Empirical formula = K2S2O4.
Scientists discovered a rock formation in the mountains that
contains some amount of Uranium-235. Upon further testing you
learn that the rock is composed of 25% Uranium-235. Knowing that
the rock is 1.426 billion years old, how long is the half-life of
Uranium-235?
The half-life of the Uranium-235, given that the rock is composed of 25% Uranium-235 is 713 million years
How do i determine the half-life?First, we shall calculate the number of half lives that has elapsed. This can be obtained as follow:
Original amount of Uranium-235 (N₀) = 100%Amount remaining of Uranium-235 (N) = 25%Number of half-lives (n) =?2ⁿ = N₀ / N
2ⁿ = 100 / 25
2ⁿ = 4
2ⁿ = 2²
n = 2
Finally, we shall determine the half-life of the Uranium-235. This can be obtained as follow:
Number of half-lives (n) = 2 Age of rock (t) = 1.426 billion years Half-life (t½) = ?n = t / t½
Cross multiply
n × t½ = t
Divide both sides by n
t½ = t / n
t½ = 1.426 / 2
t½ = 713 million years
From the calculations made above, we can conclude that the half-life is 713 million years
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Which of the following statements is true? *
The stronger the acid the easier the H+ ions dissociate in solution.
The weaker the acid the easier the H+ ions dissociate in solution.
The stronger the base the easier the H+ ions dissociate in solution.
O The weaker the base the easier the H+ ions dissociate in solution.
4 points
The stronger the acid the easier the H+ ions dissociate in solution of the following statements is true.
The correct option is A.
Does a stronger acid dissociate more?Because it almost entirely dissociates, HCl is a powerful acid. A weak acid, such as acetic acid (CH₃COOH), on the other hand, does not dissociate easily in water because numerous H+ ions are still locked up inside the molecule. In conclusion, more free H+ ions are liberated into solution with stronger acids.
Why do more stronger acids than weak acids dissociate?Strong acids (and bases) are completely dissociated into ions, which is the cause of this. In comparison to weak acids (and bases) of comparable concentrations, they therefore supply more ions for conductivity. An illustration is the complete ionization of a 0.1 M hydrochloric acid solution.
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The complete question is -
Which of the following statements is true?
A-The stronger the acid the easier the H+ ions dissociate in solution.
B-The weaker the acid the easier the H+ ions dissociate in solution.
C-The stronger the base the easier the H+ ions dissociate in solution.
D-The weaker the base the easier the H+ ions dissociate in solution.
