This value is approximate.
=============================================
Work Shown:
From the periodic table, we are working with these elements
K = PotassiumI = IodinePb = Leadand they form these relevant compounds
Potassium iodide = KILead (ii) iodide = [tex]PbI_2[/tex]Note: the lead (ii) nitrate chemical formula and it's chemical data (eg: atomic mass) doesn't matter so we won't worry about it.
--------------------
Using the periodic table, specifically the atomic mass of each element mentioned, we can find that:
Molar Mass of KI = 166.00277 grams per molMolar Mass of PbI2 = 461.00894 grams per molThey are approximate values based on the average atomic mass.
Those values are handy in calculating the theoretical yield
That theoretical yield is roughly...
[tex]\left(23 \text{ g } KI\right)*\left(\frac{\text{1 mol } KI}{\text{166.00277 g } KI}\right)*\left(\frac{\text{1 mol } PbI_2}{\text{1 mol} KI}\right)*\left(\frac{\text{461.00894 g } PbI_2}{\text{1 mol } PbI_2}\right)\approx 63.8736668 \text{ g } PbI_2[/tex]
So 23 grams of potassium iodide, and the excess amount of lead (ii) nitrate (the amount of this isn't important as long as it exceeds the potassium iodide amount) react together to produce a theoretical yield of about 63.8736668 grams of lead (ii) iodide precipitate.
-----------------------
Despite us calculating the theoretical yield to be 63.8736668 grams, we actually only got 18 grams. We call this the "actual yield".
To get the percent yield, we divide the actual yield over the theoretical yield and multiply by 100%
So,
[tex]\text{percent yield} = \frac{\text{actual yield}}{\text{theoretical yield}}*100\%\\\\\text{percent yield} \approx \frac{18 \text{ g of } PbI_2}{63.8736668 \text{ g of } PbI_2}*100\%\\\\\text{percent yield} \approx \frac{18}{63.8736668}*100\%\\\\\text{percent yield} \approx 0.2818*100\%\\\\\text{percent yield} \approx 28.18\%\\\\\text{percent yield} \approx 28\%\\\\[/tex]
In short, we expected to get a theoretical amount of roughly 63.87 grams of lead (ii) iodide, but instead we got roughly 28% percent of that theoretical amount and got 18 grams of it instead.
differentiate between stream load stream discharge and stream gradient
Answer:
Differentiated below
Explanation:
- Stream load is defined as the quantity of solid matter that's carried by the erosion of the stream.
- Stream discharge is defined as the quantity (which is volume) of water that passes a given point for a particular amount of time.
- Stream Gradient is defined as the slope of the stream. This is basically expressed as:
Stream gradient = Change in elevation between two points on a stream ÷ actual distance between the two points where water actually flows.
A serving of Frosted Flakes cereal contains 235,000 J of energy. Calculate the change in temperature (ΔT) that would occur if this food was used to heat 1,000 grams of water.
The change in temperature (ΔT) : 56.14 ° C
Further explanationGiven
Cereal energy = 235,000 J
mass of water = 1000 g
Required
the change in temperature (ΔT)
Solution
Heat can be formulated :
Q = m . c . ΔT
c = specific heat for water = 4.186 J / gram ° C
235000 = 1000 . 4.186 . ΔT
[tex]\tt \Delta T=\dfrac{235000}{1000\times 4.186}=56.14^oC[/tex]
A circuit is a path along which electric current flows. How would changing the battery in a circuit from 9 volts to 1.5 volts most likely affect the circuit? More electric charge would flow in the circuit. Less electric charge would flow in the circuit. The resistance in the circuit would decrease. The resistance in the circuit would increase.
Answer:
A wave passes from a solid to a liquid while remaining the same temperature.
The medium increases in temperature while remaining in the same phase.
The medium decreases in temperature while remaining in the same phase.
A wave passes from a liquid to a gas while remaining the same temperature.
AND less electric charge would flow in the circuit
The voltage is decreased
Explanation:
PLEZZ MARK ME AS BRAINLYEST PLEZZ!!
Changing the battery in a circuit from 9 volts to 1.5 volts would most likely result in less electric charge flowing in the circuit.
What is Ohm's law ?According ohms law, the electric voltage is the product of current and resistance in the circuit. A lower voltage battery will have less electric potential energy available to move the charges, resulting in a lower electric current flow in the circuit.
The resistance in the circuit would not necessarily increase or decrease due to the change in the battery voltage. Resistance is a property of the components in the circuit, such as resistors, wires, and other devices that can impede the flow of current.
However, if the resistance of the circuit remains the same and the battery voltage decreases, the resulting electric current flow would also decrease according to Ohm's law (I = V/R), where I is the current, V is the voltage, and R is the resistance.
Find more on circuits:
https://brainly.com/question/27206933
#SPJ7
4) 300cm of Hydrogen chloride gas were passed over 7.0g of heated iron fillings until there was no further
change. The reaction vessel was then allowed to cool to room temperature. Use the equation below to
determine the mass of iron that remained at the end of the experiment (molar gas volume = 24000cm"; Fe=56).
Fe(s) + 2HCl(g) → FeCl2(s) + H2(g)
(3 mks)
50
3 of IM colution calcium chloride (Avogadro's
The mass of iron that remained at the end of the experiment : 6.65 g
Further explanationGiven
V HCl gas = 300 cm³
mass Fe = 7 g(Ar Fe = 56 g/mol)
Reaction
Fe(s) + 2HCl(g) → FeCl2(s) + H2(g)
Required
The mass of iron remained
Solution
molar volume for 1 mol gas = 24000 cm³=24 L, so mol HCl :
[tex]\tt \dfrac{300}{24000}=0.0125~mole[/tex]
mol ratio Fe : HCl from equation : 1 : 2, so mol Fe =
[tex]\tt \dfrac{1}{2}\times 0.0125=0.00625[/tex]
mass of Iron(reacted) :
[tex]\tt 0.00625\times 56=0.35~g[/tex]
Mass remained
7 g - 0.35 = 6.65 g
How is light energy converted to chemical energy?
Answer:
Photosynthesis is the process in which light energy is converted to chemical energy in the form of sugars. In a process driven by light energy, glucose molecules (or other sugars) are constructed from water and carbon dioxide, and oxygen is released as a byproduct.
Explanation:
Answer:
Photosynthesis is the process in which light energy
Explanation:
⚠️PLS HELP I HAVE ZERO CLUE AND NEED HELP ASAP DUE AT 12 WILL GOVE BRAINLIEST THANK U⚠️
1/4th of a sample of thorium-232 remains.
How long has the sample been decaying?
Answer:
I believe it is 42.3 billion years old
Explanation:
Is it physically possible to create a chemical serum that would give you any sort of superpower??
What are the products of the combustion of a hydrocarbon?
O carbon and oxygen
O carbon dioxide and water
O carbon and hydrogen
O carbon dioxide and hydrogen
Answer:
carbon dioxide and water
The products of the combustion of a hydrocarbon is carbon dioxide and water. Hence option B is correct.
What is Hydrocarbon ?Hydrocarbon is a compound to which hydrogen atoms are attached to carbon atoms. Those are the chief components of petroleum and natural gas. Methane, Ethane, Butane and Pentane etc. are the examples of the hydrocarbon. liquid petroleum gas which we use to cook food in our home is a butane gas which is hydrocarbon.
when hydrocarbon react it releases heat, and carbon dioxide and water as by products.
lets see such a reaction for an example.
when methane react with a oxygen, it gives water and releases carbon dioxide.
CH₄ + 2O₂ ======= CO₂ + 2H₂O
Hence combustion of hydrocarbon gives water and carbon dioxide, option B is correct.
To know more hydrocarbon click :
https://brainly.com/question/30907363
#SPJ7.
3 A student investigates how the concentration of an acid affects the speed of reaction with a 0.5
D filtration
mass of magnesium at 30°C.
The student has a beaker, concentrated acid, water and the apparatus below.
P a balance
Qa dock
R a measuring cylinder
S a thermometer
Which pieces of apparatus does the student use?
A P, Q and R only
B P, Q and S only
C Q, R and S only
DP, Q, R and S
Answer:
C Q, R and S only.
Thermometer: for measuring temperature.
Measuring cylinder: for measuring accurate volume used in standardization during determination of concentration.
dock: for holding solutions
What happens when the number of electrons and protons inside of an atom are Not equel?
Hello, It's me Moriah Elizabeth!
Answer:
When the number of electrons does not equal the number of protons, the atom is ionized.
OxYgen and hydrogen particles are kept in a container. Which of the following
accurately describes diffüsion of these gases?
OOxygen and hydrogen particles concentrate at the center of the container.
Oxygen particles move to one corner of the container and hydrogen particles go
to the opposite corner
DOxygen particles and hydrogen particles repel each other.
O Oxygen particles mix evenly with hydrogen particles.
Answer:
Option D
Oxygen particles mix evenly with hydrogen particles.
Explanation:
Diffusion refers to the movement of gasses from a region of higher concentration to a region of lower concentration.
Diffusion occurs in gases because their particles are in a state of constant random motion.
Due to this continuous random motion, once the oxygen and the hydrogen are added to the container, they will begin to mix freely with each other until they fill up the entire volume of the container.
What happens if you were to swallow a small amount if wet nail polish? Answer truthfully in your own words.
Answer:
I'm pretty sure you'll be fine
Explanation:
I've swallowed more than a small amount and I'm ok sort of
PLEASE HELP ASAP I NEED HELP I LOVE YOU THIS IS URGENT PLEASE MY CLASS ENDS IN LIKE A DAY AND A HAVE 3 UNITS LEFT
Answer:
B: Hemoglobin
Explanation:
that's the answer
Answer:
B.Hemoglobin
Explanation:
Hemoglobin is the red color pigment that gives the color to your blood. Its found in the RBC's [Red Blood Cells]. Its main function is to bind completely with oxygen, due to the presence of iron in it, that helps it to get transported to various parts of the body according to its necessity through blood.
PLEASE HELP ME ASAP IM DYING
Answer:
Empirical formula is NH₃
Explanation:
Given data:
Percentage of hydrogen = 82%
Percentage of nitrogen = 18%
Empirical formula = ?
Solution:
Number of gram atoms of H = 18 / 1.01 = 17.8
Number of gram atoms of N = 82 / 14 = 5 .9
Atomic ratio:
H : N
17.8/5.9 : 5.9/5.9
3 : 1
H : N = 3:1
Empirical formula is NH₃
(HELP FAST )The model shows a molecule of silk made by a spider.
why is carbon dioxide a green house gas
Answer:
That's because the glass walls of the greenhouse trap the Sun's heat. The greenhouse effect works much the same way on Earth.
Explanation:
Gases in the atmosphere, such as carbon dioxide, trap heat just like the glass roof of a greenhouse. These heat-trapping gases are called greenhouse gases.
. The atoms are held together because they both pull on the ________________ electrons
Answer:
negative and positive i think
Explanation:
How many seconds are in 209.7 ms?
Answer:0.21 seconds
Explanation:
Just because it is and how science works
Answer:
0.21 seconds, please let me know if I am wrong
when will condensation occur?
A. When the humidity equals the relative humidity
B. When sublimation does not occur
C. When the relative humidity drops below 50 percent
D. When the temperature drops below the dew point
Answer:
d
Explanation:
What best explains why you should use transitions when writing an argument? Transitions help engage and interest the reader in the argument’s subject matter. Transitions help clarify the central argument for the reader. Transitions help the reader understand how the ideas in the argument are connected. Transitions make reading an argument smoother and more enjoyable.
Answer:
c
Explanation:
trust
Transitions help the reader understand how the ideas in the argument are connected best explains why you should use transitions when writing an argument. Therefore, option C is correct.
Why is it important to use transitions?They are cues that assist the reader in understanding your ideas. Transitional words or phrases help you move your thoughts from one sentence to the next and from one paragraph to the next.
Finally, transitional words smoothly connect sentences and paragraphs so that there are no abrupt jumps or breaks between ideas.
They make a direct link between ideas, sentences, and paragraphs. Specific words are used in effective transitions. Avoid using pronouns such as "this" to refer to an entire concept because it is not always clear who or what "this" refers to.
Transitions help the reader understand how the ideas in the argument are connected, which is why you should use them when writing an argument.
Thus, option C is correct.
To learn more about the transitions, follow the link;
https://brainly.com/question/18089035
#SPJ6
What is the general trend for electron affinity values going across a period?
Answer:
increase.
Explanation:
as you cross the period the atomic size decrease makes the atoms to have more affinity to the coming electrons.
Calculate the number of moles in 125g of Copper (II) Hydroxide. URGENT!
Answer:
1.28 mol Cu(OH)₂
General Formulas and Concepts:
Chemistry - Atomic Structure
Reading a Periodic TableUsing Dimensional AnalysisExplanation:
Step 1: Define
125 g Cu(OH)₂
Step 2: Identify Conversions
Molar Mass of Cu - 63.55 g/mol
Molar Mass of O - 16.00 g/mol
Molar Mass of H - 1.01 g/mol
Molar Mass of Cu(OH)₂ - 63.55 + 2(16.00) + 2(1.01) = 97.57 g/mol
Step 3: Convert
[tex]125 \ g \ Cu(OH)_2(\frac{1 \ mol \ Cu(OH)_2}{97.57 \ g \ Cu(OH)_2} )[/tex] = 1.28113 mol Cu(OH)₂
Step 4: Check
We are given 3 sig figs. Follow sig fig rules and round.
1.28113 mol Cu(OH)₂ ≈ 1.28 mol Cu(OH)₂
Is the specimen classified as living or non-living? Use three pieces of evidence and reasoning to justify your answer. Provide 3 out of the 7 characteristics of life criteria to use as evidence.
Answer: All living things move in some way. This may be obvious, such as animals that are able to walk, or less obvious, such as plants that have parts that move to track the movement of the sun. All living things grow. Earthworms hatch from eggs and can grow up to a metre or more in length! Some earthworms are also able to regrow small parts of their body that have been lost or injured. Chromists are a diverse group of plant-like organisms and range from very small to very large. They are found in almost all environments.
Explanation: I hope that helped yall!
What type of glassware is useful for transferring liquids from the large stock container to a smaller container such as a graduated cylinder
Answer:
Beaker
Explanation:
In the laboratory, we often need to transfer liquids from a large stock container to a graduated cylinder in order to measure a specific volume of liquid.
This is done using a beaker. A beaker is a lipped cylindrical glass container for laboratory use (Oxford dictionary).
Hence, when transferring liquids from the large stock container to a smaller container such as a graduated cylinder, we use a beaker.
If you put an egg on a plate will it melt ?? Im confused
In the diagram of a transverse wave shown, what does M represent?
Transverse Wave
P=1cycle per second
A. Wavelength
B. Frequency
C. Amplitude
D. Rest positions
In the diagram of a transverse wave, P = 1 cycle per second, M represent wavelength. Therefore, option A is correct.
What is transverse wave ?A wave is considered to be transverse if its oscillations run counterclockwise to the wave's direction of advance. A longitudinal wave, on the other hand, moves in the direction of its oscillations. Transverse waves include water waves.
Due to the shear stress produced, transverse waves are frequently observed in elastic solids; in this situation, the oscillations are caused by the displacement of the solid particles from their relaxed state in directions perpendicular to the wave's propagation.
Trough: A transverse wave's lowest point. The distance separating one transverse wave's peak from the next is known as the wavelength. The distance from the wave's resting position to its crest is its amplitude.
Thus, option A is correct.
To learn more about transverse wave, follow the link;
https://brainly.com/question/23165088
#SPJ5
What occurs as the atomic number of the elements in Period 2 increases?
1)The nuclear charge of each successive atom decreases, and the atomic radius decreases.
2)The nuclear charge of each successive atom decreases, and the atomic radius increases.
3)The nuclear charge of each successive atom increases, and the atomic radius decreases
4)The nuclear charge of each successive atom increases, and the atomic radius increases.
Answer:
3)The nuclear charge of each successive atom increases, and the atomic radius decreases
Explanation:
As we move from left to right across the periodic table the number of valance electrons in an atom increase. The atomic size tend to decrease in same period of periodic table because the electrons are added with in the same shell. When the electron are added, at the same time protons are also added in the nucleus. The positive charge is going to increase and this charge is greater in effect than the charge of electrons. This effect lead to the greater nuclear attraction. The electrons are pull towards the nucleus and valance shell get closer to the nucleus. As a result of this greater nuclear attraction atomic radius decreases and ionization energy increases because it is very difficult to remove the electron from atom and more energy is required.
which of the following has the smallest radius? K+, K, Rb, Rb+
:
Option (c) is the correct answer.
Explanation:
It is known that when we move down a group then there is increase in size of atom. This is because there occurs increase in number of shells in the atom.
Also, when an atom loses electrons then it acquires a positive charge and size of the atom decreases. On the other hand, when an atom gain electrons then it acquires a negative charge and size of the atom increases.
Since, both Rb and K are same group elements and Rb has larger atomic size than K.
Hence, we can conclude that out of the given options K^{+}
+ has the smallest size.
Answer:
K+
Explanation:
Just took the quiz :)
Based on the reactivities of the elements involved, which reaction will form products that are more stable than the reactants?
Answer:
Exothermic reaction
Explanation:
Since in an exothermic reaction heat is released, the products will be more stable than the reactants.
4 Fe + 3 O2 --> 2 Fe2O3
How many grams of Fe will react with 40.0 grams of O2?
Answer:
93.33 g of Fe
Explanation:
The balanced equation for the reaction is given below:
4Fe + 3O₂ —> 2Fe₂O₃
Next, we shall determine the masses of Fe and O₂ that reacted from the balanced equation. This can be obtained as follow:
Molar mass of Fe = 56 g/mol
Mass of Fe from the balanced equation = 4 × 56 = 224 g
Molar mass of O₂ = 2 × 16 = 32 g/mol
Mass of O₂ from the balanced equation = 3 × 32 = 96 g
SUMMARY:
From the balanced equation above,
224 g of Fe reacted with 96 g of O₂.
Finally, we shall determine the mass of Fe required to react with 40 g of O₂. This can be obtained as follow:
From the balanced equation above,
224 g of Fe reacted with 96 g of O₂.
Therefore, Xg of Fe will react with 40 g of O₂ i.e
Xg of Fe = (224 × 40)/96
Xg of Fe = 93.33 g
Therefore, 93.33 g of Fe is required to react with 40 g of O₂.