Once chewed and swallowed, the food will be digested and absorbed nutrients, while the rest of the food will be excreted through the body's feces. This digestion process can take about 24-72 hours.
How is the digestive process in humans?The process of digestion of food in humans can be divided into two types, namely mechanical digestion and chemical (enzymatic) digestion. Mechanical digestion is the process of changing food from a large or coarse form to a smaller or finer form. The process takes place in the mouth with the help of teeth and tongue. The mechanical digestion process also occurs in the stomach with the help of peristaltic motion of the stomach wall, so that food is like being stirred. While the chemical digestion process is the process of converting food substances from complex forms into simpler forms with the help of digestive enzymes.
Learn more about digestion of food here: https://brainly.com/question/21470803#SPJ4
when copper is heated with an excess of sulfur, copper(i) sulfide is formed. in a given experiment, 0.0970 moles of copper was heated with excess sulfur to yield 6.43 g copper(i) sulfide. what is the percent yield?
The percent yield is 83.29%.
What Is percent yield?The real yield is calculated as the theoretical yield divided by the theoretical yield multiplied by 100. % Yield = (Actual Yield % Theoretical Yield × 100%) Many factors can cause a chemical reaction's actual yield to be lower than its theoretical yield.
Numbers of moles copper = 0.0970 moles
Mass of copper(I) sulfide = 6.43 grams.
Balanced equation
2Cu + S ⇒ Cu₂S
Calculate moles of Cu₂S
To create 1 mol of Cu2S from 2 moles of Cu, we require 1 mole of S.
For 0.0970 moles Cu we'll have 0.0970 / 2 = 0.0485 moles
Calculate mass of Cu₂S
Mass Cu₂S = moles Cu₂S × molar mass Cu₂S
Mass Cu₂S = 0.0485 moles × 159.16 g/mol
Mass Cu₂S = 7.72 grams
Calculate percent yield
Percent yield = (actual yield/ theoretical mass) × 100%
Percent yield = (6.43grams / 7.72 grams) × 100%
Percent yield = 83.29 %
To know more about percentage yield visit:
https://brainly.com/question/27492865
#SPJ4
please help with my chemistry homework thank you so much
Answer:
There are 2.2 moles of hydrogen.
Explanation:
The given information from the exercise is:
- Volume (V): 48.6L
- Temperature (T): 0°C (273K)
- Pressure (P): 1atm
1st) It is important to convert the temperature unit from °C to Kelvin:
[tex]0+273=273K[/tex]This first step is very important, because all the units must be at atm, L and Kelvin, before using the Ideal Gases Law formula.
2nd) Now to calculate the moles of hydrogen, we hae to replace the values of V, T and P in the Ideal Gases Law formula:
[tex]\begin{gathered} P*V=n*R*T \\ 1atm*48.6L=n*0.082\frac{atm*L}{mol*K}*273K \\ 48.6atm*L=n*22.4\frac{atm*L}{mol} \\ \frac{48.6atm}{22.4\frac{atm*L}{mol}}=n \\ 2.2moles=n \end{gathered}[/tex]R: is the gases constant, in its value is 0.082atm.L/mol.K.
So, there are 2.2 moles of hydrogen.
What advantages exist when using the balloons to model molecular shapes verses using model kits?.
Balloons can be used to mimic the morphologies of covalently bound chemical molecules. Many students struggle to visualize the shapes. The balloons are superior (and less expensive) than typical ball and stick model kits. The balloons in this exercise represent pairs of electron-electron clouds, not atoms.
Each balloon is an electron domain (either a bonded pair or a lone pair of electrons) that surrounds a core atom. When balloons are linked, they spontaneously adopt the lowest energy structure suggested by the VSEPR model.
Learn more about VSEPR model here:
https://brainly.com/question/28355903
#SPJ4
Name the two molecular compounds you think would have the same mass.
The oxides of 'C' and 'N' are the two molecular compounds having the same mass i.e. CO₂ and N₂O.
To calculate the molecular weight of a molecule, individual atomic masses of various elements are added.
Given: The atomic mass of 'C' = 12u
The atomic mass of 'N' = 14u
The atomic mass of 'O' = 16u
∵Molecular weight of CO₂ = 12+16+16 = 44g/mol
The molecular weight of Carbon Dioxide is 44g/mol.
∵Molecular weight of N₂O = 14+14+16 = 44g/mol
The molecular weight of Nitrous Oxide is 44g/mol.
Molecular compounds having the same mass are known as Isobars. Isobaric properties are:
Same physical behaviorDifferent chemical behaviore.g.: Ar and Ca
Are other metals also suitable for obtaining copper out of oxide copper?
Answer: Yes
Explanation: More reactive metals in the reactivity series can displace copper from copper oxide just leaving copper on its own after the reaction. But usually, carbon is used to displace copper as its safe and more reactive.
Specify the particular process(es) that would be altered, and EXPLAIN how this/these process(es) would be altered. (Hydrologic Cycle)
The hydrologic cycle to be altered because of global warming due to increasing green house effect.
What is global warming?Global warming is the term used to describe the phenomena of a gradual increase in temperature close to the earth's surface. This trend has been noticed during the past century or so. This change has affected the pattern of the earth's climate. Scientists have offered proof that the earth's temperature is gradually rising, even if the concept of global warming is still up for debate.
Global warming has a number of causes that are harmful to people, plants, and animals.
What is Green house effect?A glass-enclosed structure called a greenhouse is used to grow plants. The sun's beams warm the greenhouse's air and plants. The greenhouse must be warmed in order for the plants to flourish because the heat that is trapped inside is unable to escape. The earth's atmosphere is identical.
The greenhouse gases in the earth's atmosphere absorb the heat throughout this process. Because of this, the earth's surface becomes warmer, which enables life to exist on the planet.
Learn more about global warming here :
brainly.com/question/3553382
#SPJ13
Which of the following are isotopes of element X, with atomic number of 9: 19/9X, 20/9X, 9/18X, and 21/9X.
The isotopes of the element X are; 19/9X, 20/9X and 21/9X.
What are isotopes?The term isotopes has to do with the atoms that have the same atomic number but they do not have or posses the same mass number. The implication of this definition is that the atoms that we call the isotopes are different in the number of the neutrons that they do contain.
Now we know that the common thread that holds the atoms that we call an isotope of each other is that they have the same atomic umber and the atomic number of the atom X in this case is 9.
Learn more about isotopes:https://brainly.com/question/12955625
#SPJ1
Four atoms of element X have the same mass as one atom of bromine.
(i) What is the relative atomic mass of element X?
80
(ii) Name element X.
(c) Eight atoms of element Y have the same mass as two atoms of silicon.
(i) What is the relative atomic mass of element Y?
56
(ii) Name element Y.
Answer:
Neon and lithium.
Explanation:
4x = 79.9 atomic mass
x = 19.98 atomic mass
The element having the nearest atomic mass to 19.98 is neon with an atomic mass of 20.180.
==
8y = 2*(28.085)
8y = 56.17
y = 7.021
The element having the nearest atomic mass to 7.021 is lithium with an atomic mass of 6.94..
57. For the reaction shown, calculate the theoretical yield ofthe product in grams for each of the initial quantities ofreactants.2 Al(s) + 3 Cl₂(g) 2 AlCl3(s)(a) 1.0 g Al; 1.0 g Cl₂(b) 5.5 g Al; 19.8 g Cl₂(c) 0.439 g Al; 2.29 g Cl₂
In this question, we have to calculate the theoretical yield of AlCl3, based on the following reaction:
2 Al + 3 Cl2 -> 2 AlCl3
In this reaction, we have the following molar ratios:
2 Al = 3 Cl2
2 Al = 2 AlCl3
3 Cl2 = 2 AlCl3
We have as the initial mass of the reactants:
1.0 grams of Al and 1.0 grams of Cl2
We need to find the limiting and excess reactants before the theoretical yield, and in order to find the limiting and excess reactants, we need to calculate the number of moles we have in 1.0 grams of each
Starting with Al, the molar mass of Al is = 27g/mol
27g = 1 mol of Al
1.0g = x moles of Al
27x = 1
x = 0.37 moles of Al in 1 gram of Al
According to the molar ratio between Al and Cl2, 2 moles of Al = 3 moles of Cl2, what if we have 0.37 moles of Al:
2 Al = 3 Cl2
0.37 Al = x Cl2
2x = 1.11
x = 1.11/2
x = 0.55 moles of Cl2 will be needed to react with 0.37 moles of Al
The molar mass of Cl2 is 70.9g/mol:
70.9g = 1 mol of Cl2
1.0g = x moles
70.9x = 1
x = 1/70.9
x = 0.014 moles
We have 0.014 moles of Cl2 in this reaction, and we needed 0.55 moles of Cl2, which means that Cl2 is the limiting reactant and Al is in excess
Using the number of moles of the limiting reactant, 0.014 moles, we will find the final mass of the product
First we need to know how many moles of AlCl3 we have, based on the molar mass between Cl2 and AlCl3, 3:2
3 Cl2 = 2 AlCl3
0.014 Cl2 = x AlCl3
3x = 0.028
x = 0.028/3
x = 0.009 moles of AlCl3
Now we have the number of moles of AlCl3, the molar mass is = 133.34g/mol
133.34g = 1 mol
x grams = 0.009 moles of AlCl3
x = 0.009 * 133.34
x = 1.20 grams of AlCl3
The theoretical yield of AlCl3 for 1.0 gram of Al and 1.0 gram of Cl2 will be 1.20 grams
here are three isotopes of silicon: si-28, si-29, and si-30, with relative abundances of 92.23%, 4.67%, and 3.1%, respectively. determine the atomic mass of silicon.
The atomic mass of silicon is calculated to be 28.1087 amu if the three isotopes have relative abundances of 92.23%, 4.67%, and 3.1%, respectively.
The atomic mass of an element can be determined by first changing the percentage abundance of each isotope into decimal form, then multiplying this value by the atomic mass of that isotope. Then the resultant value of each isotope is added together to get the atomic mass of the element.
As the mass of the three isotopes of silicon is 28 amu, 29 amu, and 30 amu with relative abundances of 92.23%, 4.67%, and 3.1%, respectively, we can calculate the atomic mass of silicon as follows;
si-28 = 92.23% = 92.23/100 = 0.9223
si-29 = 4.67% = 4.67/100 = 0.0467
si-30 = 3.1% = 3.1/100 = 0.031
Now multiplying these values by the atomic mass;
si-28 = 0.9223 × 28 = 25.8244
si-29 = 0.0467 × 29 = 1.3543
si-30 = 0.031 × 30 = 0.93
Now adding these values together;
atomic mass of silicon = 25.8244 + 1.3543 + 0.93
atomic mass of silicon = 28.1087 amu
Therefore; the atomic mass of silicon is calculated to be 28.1087 amu.
To learn more about atomic mass; click here:
https://brainly.com/question/11065367
#SPJ4
two compounds might have spots with the same rf value in a chromatography experiment and not be identical compounds. which proposed chromatography experiment could best help determine whether the compounds are identical? select one: repeat the original experiment with a different solvent system repeat the original experiment with the development chamber jar open repeat the original experiment with larger spots of each compound repeat the original experiment with a mixture of the compounds in a single spot
The chromatography experiment which would best decide whether the compounds are identical or not is to Repeat the original experiment once more with various solvent systems;
If two things have the same Rf value, they are probably the same compound, but not always. They are definitely distinct compounds if their Rf values differ.
Compounds with a low polarity have higher Rf values than compounds with higher polarity. Compounds' absorptivity typically rises in tandem with their polarity—that is, the more polar a compound is, the more strongly it binds to the adsorbent. Solvents' eluting power increases with polarity. In diverse solvents, different compounds with identical Rf values might behave differently.
Know more about Rf values here: https://brainly.com/question/1394204
#SPJ4
why was it important to use a volumetric pipette and volumetric flasks (instead of some other glassware, for example, a graduated cylinder, etc.) for the preparation of all solutions in this procedure?
It is important to use a volumetric pipette and volumetric flasks because they are marked with one trace, they are calibrated and there are very less chance of error in them.
The percentage error of volumetric flask is very low at 0.3%. Volumetric pipette and volumetric flasks are specially designed to give accurate measurements of liquids and make them suitable for preparing standard solutions.
The volumetric pipette has a long and narrow neck which makes it easier to measure.
Graduated cylinders are more accurate then beakers. However they are not used to carry volumetric evaluations for this purpose volumetric tools like flasks and pipettes are used because they are more accurate and exact.
To know more about Volumetric flask and Pipette click here
brainly.com/question/5897608
#SPJ4
How does the conductivity of metalloids compare to the conductivity of metals and nonmetals?
Metalloids conduct electricity better than metals, but not as well as nonmetals.
Metals, metalloids, and nonmetals all have the same level of conductivity.
Metalloids conduct electricity better than nonmetals, but not as well as metals.
Metalloids cannot conduct electricity.
The conductivity of metalloids can be compared to the conductivity of metals and nonmetals because metalloids conduct electricity better than nonmetals, but not as well as metals (Option C).
What are metalloids?The expression metalloids is a term used to denote chemical elements that have features resembling metals such as an acceptable electrical conductivity, but they are not metals (e.g. boron, germanium, antimony, arsenic, polonium, etc).
Therefore, with this data, we can see that metalloids are similar to metals in electrical conductivity but they are not metals because they do not fit all properties of metals.
Learn more about metalloids here:
https://brainly.com/question/6007181
#SPJ1
what statements are always true about limiting reactants? select one or more: the limiting reactant is completely used up in the reaction. there will be an excess of other reactants at the end of the reaction. the limiting reactant is always the same for a given reaction. the limiting reactant dictates the amount of product. the limiting reactant has a lower mass than other reactants.
The correct statements are:
The limiting reactant is completely used up in the reaction.
There will be an excess of other reactants at the end of the reaction.
The limiting reactant dictates the amount of product.
Which reactant will be the limiting reactant depends on the molar ratios of all the reactants in the experiment (and the coefficients in the balanced reaction equation), so it will absolutely vary depending on the reaction setup and conditions, which is why it cannot always be the same for a given reaction.
Because the molar ratios of the reactants dictate which of them will be the limiting one, it is not true that the one with the lowest mass will always be the limiting reactant.
You can learn more about limiting reactants here:
brainly.com/question/14225536
#SPJ4
Determine the validity of the following experiment based on the trend of the results.
This graph shows acceleration over pulling force. Both axes are labeled and have units. There is no title. The data increases steadily from (0.1, 0.8) to (0.6, 3.4). The best fit line crosses the y axis at 0.4.
A. Experiment’s results vary greatly from the best fit line; this variation means the data is not reliable.
B. Experiment’s results vary greatly from the best fit line; this variation means the data is reliable.
C. Experiment’s results lie close to the best fit line and have no noticeable outliers; it is not reliable.
D. Experiment’s results lie close to the best fit line and have no noticeable outliers; it is reliable.
From the slope of the graph, the experiment’s results lie close to the best fit line and have no noticeable outliers; it is reliable; option D
What is a line of best fit?A line of best fit is a line that plots a range of data to the approximately best value.
The line of best will minimized the variation between several points in the data.
Considering the data points plotted, the slope of the whole line can be derived as:
slope = Δy / Δx
slope = (3.4 - 0.8) / (0.6 - 0.1)
slope = 5.2
Taking the slope from the intercept of the line of best fit on the y-axis
Slope = (3.4 - 0.4) / (0.6 - 0.0)
slope = 5.0
Therefore, the data is reliable.
Learn more about the line of best fit at: https://brainly.com/question/1518824
#SPJ1
8. a small cylinder of helium gas for filling balloons has a volume of 2.30 l and a pressure of 1850 atm at 25oc. how many balloons can you fill if each one has a volume of 1.5 l and a pressure of 1.25 atm at 25oc?
A total of 2269 balloons of 1.5 Liters volume and 1.25 atm pressure can be filled from the cylinder of volume 2.3 Liters and 1850 atm pressure.
The volume of the Helium gas is 2.3L and the pressure is 1850 atm at 25° Celsius.
The smaller balloons that has to be filled are of volume 1.5 L at the pressure 1.25atm at the same temperature of 25° C.
Because the temperature is conserved, so, according to Boyle's law,
When temperature is constant, the pressure and volume of the gas are inversely proportional to each other.
we can write,
P₁V₁ = P₂V₂
Let us say that a total n numbers of smaller balloons can be filled, so,
P₁V₁ = n(P₂V₂)
Where,
P₁ is pressure of bigger balloon,
V₁ is the volume of the bigger balloon,
P₂ is the pressure of the smaller balloon and,
V₂ is the volume of the smaller balloon.
Now, putting all the values,
2.30 x 1850 = n(1.5 x 1.25)
n = 2269
So, a total 2269 balloons can be filled from the bigger balloon to the smaller balloons.
To know more about Boyle's Law, visit,
https://brainly.com/question/1696010
#SPJ4
Which of the following Periodic Table trends (characteristics) is incorrect?
a) electron affinity decreases from top to bottom on the periodic table
b) electronegativity decreases left to right across the periodic table
c) atomic radii decreases left to right across the periodic table
d) ionization energy decreases from top to bottom on the periodic table
(b) electronegativity decreases left to right across the periodic table
Electronegativity increases from left to right in a period across the periodic table.
Electronegativity is a relative property that defines the tendency to attract shared pair of electrons. It is a unitless parameter that is calculated by different formulae.
Pauling scale is widely used to calculate the electronegativity values of a covalent bond. e.g. F = 4.0, Cl = 3.0, etc.
⇒Electron affinity decreases from top to bottom in the periodic table.
⇒Atomic radii decrease from left to right in the periodic table.
⇒Ionization energy decreases from top to bottom in the periodic table.
when a condensed fuel, such as a candle or a pool of gasoline, burns, a portion of the heat of the gaseous flame is transferred to the fuel, causing it to gasify. when this gasification occurs without chemical decomposition of the molecules, it is:
The process of gasification that occurs without the chemical decomposition of the molecules is pyrolysis.
Pyrolysis is the process of heating substances especially organic materials in absence of oxygen as oxygen is not involved combustion does not occur rather a biomass thermally decomposes into combustible gases and other products.
when condensed fuel such as a candle or pool of gasoline burns the heat produced makes them convert into smaller fragments in absence of air through the application of heat.
The heat produced is responsible for gasification and responsible for thermal combustion without the usage of oxygen making them remain than combustion over oxygen which ensures complete decomposition.
To learn more about combustion see:
https://brainly.com/question/14104327?referrer=searchResults
#SJP4
which of the following statements about a reaction rate is not true? group of answer choices reaction rate is the speed at which the reaction proceeds toward equilibrium. reaction rate is governed by the energy barrier between reactants and products. enzymes can accelerate the rate of a reaction. reaction rates are not sensitive to temperature. none of these.
The incorrect statement is, "reaction rate is the speed at which the reaction proceeds towards equilibrium".
The rate of the reaction is defined as the rate at which the reaction is taking place.
It is true that the rate of reaction is governed by the energy barrier between the reactant and the products.
Enzymes are special compounds which can accelerate the rate of reaction.
The rate of reaction is independent of the rate of temperature of the system. The rate of reaction depends on the concentration of the reactants.
Rate of the reaction is directly proportional to the increase in concentration of products.
To know more about rate of reaction, visit,
https://brainly.com/question/24795637
#SPJ4
The hydrochloric acid utilized in this experiment can often discolor gloves if it is spilled on them during use. If this does occur, what should be done in order to remedy this potentially hazardous situation?.
Option B: Apply some sodium bicarbonate to the gloves to neutralize them in order to address this potentially dangerous condition with hydrochloric acid.
What is hydrochloric acid?Muriatic acid, another name for hydrochloric acid, is an aqueous solution of hydrogen chloride. It's a really dull response with a strong odor. It is currently classified as a powerful acid. It is a component of stomach acid in the digestive systems of the majority of animal species, including humans.
In the food, textile, metallurgical, and rubber industries, hydrogen chloride (HCl) is typically employed as a bleaching agent to neutralize alkaline marketers. It quickly hydrolyzes when exposed to water and is far neutralized when released into the soil.
To learn more about hydrochloric acid refer to:
https://brainly.com/question/24586675
#SPJ4
79.853 ml of 4.988 m sodium fluoride (aq) is added to 23.760 ml of 1.471 m beryllium sulfate. after the reaction is complete, what is the mass of precipitate that has formed?
Using the balanced reaction equation, we can calculate that the mass of the precipitate will be 1.617 g.
To solve this question, we need to write the balanced reaction equation first:
2 NaF(aq) + BeSO₄(aq) → Na₂SO₄(aq) + BeF₂(s)
We can now see that the precipitate will be beryllium fluoride. We can also see that 1 mol of beryllium sulfate reacts with 2 moles of sodium fluoride. Now we can calculate the number of moles (n) of both reactants using their molarities (c) and volumes (V):
c = n/V ⇒ n = c * V
n(NaF) = c(NaF) * V(NaF)
n(NaF) = 4.988 M * 79.854 mL = 0.3983 mol
n(BeSO₄) = c(BeSO₄) * V(BeSO₄)
n(BeSO₄) = 1.471 M * 23.3760 mL
n(BeSO₄) = 0.03439 mol
We can see that n(NaF) is more than 2 times greater than n(BeSO₄), so NaF is in excess, and BeSO₄ is the limiting reactant. Now we can calculate the number of moles of BeF₂ formed:
1 mol BeSO₄ : 1 mol BeF₂ = 0.03439 mol BeSO₄ : X
X = 0.03439 mol BeF₂
We can now convert the number of moles (n = 0.03439 mol) of BeF₂ into mass (m), using the molar mass of BeF₂ (M = 47.01 g/mol):
n = m/M ⇒ m = n * M
m = 0.03439 mol * 47.01 g/mol
m = 1.617 g
You can learn more about balanced reaction equations here:
brainly.com/question/22064431
#SPJ4
What type of evidence can be pulled from both a computer and a portable device?
O Images
O Text history
O GPS coordinates
O Phone call data
Type of evidence can be pulled from both a computer and a portable device is images, text history, GPS coordinates
Computer is the machine that can store and process the information and it is an electronic device that manipulate information or data and type of evidence can be pulled and collected from digital device is
Computer documentsEmailsText and instant messages,TransactionsImagesInternet historiesThe above all examples of information that can obtained from electric devices
Therefore, the digital evidence can be pulled from both a computer and a portable device is images, text history, GPS coordinates
Know more about portable device
https://brainly.com/question/28650694
#SPJ1
a sample of an ideal gas at 1.00 atm and a volume of 1.52 l was placed in a weighted balloon and dropped into the ocean. as the sample descended, the water pressure compressed the balloon and reduced its volume. when the pressure had increased to 70.0 atm, what was the volume of the sample? assume that the temperature was held constant.
The volume of the balloon when the balloon descended down in the water becomes 0.0217 Liters.
We know, from the Boyle's Law,
If the temperature of a gas is kept constant, the pressure of the gas and the volume of the gas becomes inversely proportional to each other.
So, we can write,
P₁V₁ = P₂V₂
Where,
P₁ is the initial pressure of the gas,
V₁ is the initial volume of the gas,
P₂ is the final pressure of the gas,
V₂ is the final volume of the gas.
According to the given condition, the initial volume of the ideal gas was 1.52 L and the initial pressure of the gas is 1 atm and the final pressure of the gas is 70 atm while the final volume is unknown,
So,
1.52 x 1 = V₂ x 70
V₂ = 0.0217 Liters.
The final Volume of the gas is 0.0217 Liters.
To know more about Boyle's Law, visit,
https://brainly.com/question/1696010
#SPJ4
HElp me please!!!!!!!!!!!!!!!!!!!!!
If a student wants to demonstrate the size of a magnetic field to a friend, an activity which the student should perform is to: sprinkle iron filings around the magnet, and observe the pattern in which the iron filings arrange themselves.
What is the law of magnetism?The law of magnetism states that the like poles of a magnet would repel one another while unlike (different) poles would generally attract each other.
This ultimately implies that, two north (N) poles of a magnet would repel one another while a north (N) and south (S) would attract each other.
Based on the law of magnetism, we can reasonably infer and logically deduce that this student should sprinkle iron filings around a magnet, and then observe the pattern in which these iron filings would be arranged the length of the magnet.
Read more on magnet here: https://brainly.com/question/27862911
#SPJ1
Complete Question:
A student wants to demonstrate the size of a magnetic field to a friend. Which activity should the student perform?
answer choices
Suspend a magnet freely using a thread, and compare its alignment with a compass.
Cut a magnet in half, and bring the halves together to show they attract each other.
Sprinkle iron filings around the magnet, and observe the pattern in which the iron filings arrange themselves.
Rub an iron bar with a magnet, and bring the bar close to the magnet to show that they attract each other.
potassium iodide reacts with lead (ii) nitrate to form lead (ii) iodide and potassium nitrate. what are the reactants? what are the products?
The reactant will be potassium iodide and lead (ii) nitrate. The products will be lead (ii) iodide and potassium nitrate.
In the field of chemistry, reactants can be described as starting materials that react together in order to form a product. The reactants are the starting material whereas the products are the ending material.
In the case above, potassium iodide and lead (ii) nitrate are the reacting materials as they are the starting materials. On the other hand, lead (ii) iodide and potassium nitrate are the ending products of this reaction.
While writing a chemical equation, the reactants are written on the left-hand side, before an arrow. On the other hand, the products are written on the right-hand side after the arrow.
To learn more about reactants, click here:
https://brainly.com/question/6421464
#SPJ4
Which chemical symbol represents a compound?
The compound is represented by formula comprising symbols of elements.
An element is represented by chemical symbol like oxygen is O, hydrogen is H calcium is Ca and so on.
The compound is represented by the formula comprising symbols of elements. Compound is made up of two or more elements join together. some of the example are given below :
water - H₂O , made up of oxygen atom and hydrogen atom
Ammonia - NH₄
Calcium carbonate - CaCO₃
Carbon dioxide - CO₂
Acetic acid - CH₃COOH
these are the some example of compound , formula of compound comprises the chemical symbol of elements.
Thus, The compound is represented by formula comprising symbols of elements.
To learn more about compound here
https://brainly.com/question/13516179
#SPJ1
What is flow of lava called?
Answer:
Clinkers
Explanation:
Clinkers are generally considered to form by fragmentation of an upper vesiculated crust due to an increase in apparent viscosity and/or to an increase in shear strain rate
Which of these is an example of a physical change?
à rusting metal
& browning fruit
burning wood
melting ice
Answer:
The correct answer is Water boiling. Examples of physical change are freezing of water, boiling of water, melting of wax, etc. Examples of chemical change are digestion of food, burning of paper, rusting of metal, silver tarnishing, etc.
if i have an unknown quantity of CI2 at a pressure of 1.2 atm, a volume of 31 liters and a temperature of 87C, how many moles of CI2 do i have
Answer:
I think 1.3 moles correct me if I'm wrong
Explanation:
it has been found that ddt in the soil decomposes by a first-order reaction with a half-life of 12.0 years. how long would it take ddt in a soil sample to decompose from a concentration of 195 ppbm (parts per billion by mass) to 15 ppbm?
The ddt in the soil with half-life of 12 years needs 44.4 years to decompose.
We need to know about the half-life of the radioactive elements to solve this problem. The radioactive element will decay over time and follow the equation
N = No(1/2)^(t/t'')
where N is the final quantity, No is the initial quantity, λ is the decaying constant, t is time and t'' is the half-life of a radioactive element.
From the question above, we know that
t'' = 12 yr
N = 15 ppbm
No = 195
By substituting the given parameter, we can calculate the required for decomposing
N = No(1/2)^(t/t'')
15 = 195(1/2)^(t/12)
1/13 = (0.5) ^ (t/12)
t/12 = ⁰'⁵log(1/13)
t/12 = 3.7
t = 44.4 years
Find more on half-life at: https://brainly.com/question/25750315
#SPJ4