Answer:
1.57
Explanation:
moles = mass / molar mass
moles = 69 / 44.013
moles = 1.57
moles N₂O = 69 : 44 g/mol = 1.568
N₂O : 2 moles N, 1 mole O
moles N = 1.568 x 2 = 3.136
how do i solve these equations using proust's law? we haven't gone over balancing chem equations in class and our teacher doesn't want us to use those but instead some kind of ratio? can someone explain
Answer:
Explanation:
Ok so Proust's Law, better known as the Law of Definite Proportions, states that the components of a compound always exist in a fixed ratio. This means that it does not matter what the source of the components are nor the coefficients in front of them. The ratio your teacher is referring to is most likely mass percent/ percent composition. This ratio is the amount of the component over the amount of the entire compound times 100%.
*I am not very familiar with this law so please do with my answers what you will :)*
7.)
First, you want to find the percent composition (aka mass composition) of Na in NaCl.
45.89 g Na
--------------------- x 100% = 39.3%
116.89 g NaCl
So, there must be 39.3% sodium in NaCl. You can find how much chlorine is in NaCl by subtracting that percent by 100 (to find the percent composition of chlorine) then multiplying it by the mass.
100% - 39.3% = 60.7%
60.7% / 100 = 0.0607
116.89 g NaCl x 0.0607 = 70.91 g Cl₂
You could also just subtract the mass of sodium from the mass of sodium chloride to find the mass of chlorine.
116.89 g NaCl - 45.89 g Na = 71 g Cl₂
8.)
10.57 g Mg + 6.96 g O₂ = 17.53 g MgO
6.96 g O₂
--------------------- x 100% = 39.7% O₂
17.53 g MgO
9.)
6.46 g Pb = 1 g O₂
68.54 g Pb = 28.76 g O₂
68.54 g Pb / 28.76 g O₂ = 2.83 g ≠ 6.46 g
No, the two samples are not the same because the proportion of lead to oxygen is not the same for both samples. In the first sample, there is 6.46 g lead for every oxygen. In the second sample, there is 2.38 g lead for every oxygen.
A reaction forms a gas at 90.4 ∘C. Report this value using the temperature scale required for gas law calculations and select the correct units for your answer.
The temperature scale required for gas law calculations is Kelvin , The temperature of the gas is 363 in Kelvin.
What is Gas Law ?According to Gas law , for a unit mole of ideal gas the product of pressure to volume is equal to the product of Universal Gas Constant and Temperature.
it is written as
PV = RT
It is given that A reaction forms a gas at 90.4 °C.
The temperature scale required for gas law calculation is Kelvin
Temperature in Kelvin = Temperature in degree Celsius +273
Temperature in Kelvin = 90.4 +273
Temperature in Kelvin = 363 K
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What is the empirical formula for a compound composed of 0.0683 mol of carbon ( C ), 0.0341 mol of hydrogen ( H ), and 0.1024 mol of nitrogen ( N )?
The empirical formula for a compound composed of 0.0683 mol of carbon ( C ), 0.0341 mol of hydrogen ( H ), and 0.1024 mol of nitrogen ( N ) is [tex]C_2HN_3[/tex].
What is the empirical formula?An empirical formula tells us the relative ratios of different atoms in a compound.
Given data:
Moles of carbon = 0.0683 mol
Moles of hydrogen = 0.0341 mol
Moles of nitrogen = 0.1024 mol
Dividing each mole using the smallest number that is divided by 0.0341 moles.
We get:
Carbon= 2
Hydrogen=1
Nitrogen=3
The empirical formula for a compound is[tex]C_2HN_3[/tex].
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vinegar contains 5g of acetic in 100mL of solution so the (w/v)% concentration is:
The (w/v)% concentration of vinegar contains 5g of acetic in 100mL of solution is approx 0.5 %
What is Concentration ?The concentration of a chemical substance expresses the amount of a substance present in a mixture.
There are many different ways to express concentration.(w/v)% is one of them.
Given ;
Mass of solute(acetic acid) is 5.0 g Volume of solution is 100.0 mL.
We need to convert the grams of acetic acid to moles ;
Formula of acetic acid is CH₃COOH
Thus,
Molar mass of acetic acid = 2(12.01) + 4(1.01) + 2(16)
= 24.02 + 4.04 + 32
= 60.06 grams per mol
Moles of acetic acid = 5.0/60.06
= 0.083 moles
(w/v)% = 0.083 x 60 / 1000 x 100
= 0.498 %
= 0.5 %
Hence, The (w/v)% concentration of vinegar contains 5g of acetic in 100mL of solution is approx 0.5 %
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Which of the following is an insoluble compound that is likely to be produced by the reaction below?
CaSO4 + PbI _______
The following is an insoluble compound that is likely to be produced by the reaction below CaSO4 + PbI- CaI + PbSO4. The PbSO4 will be insoluble as The sulfates are insoluble in water besides for the sulfates of calcium, barium, mercury, and lead.
Why lead sulfate is insoluble in water?Lead sulphate ($PbS$) is insoluble in water due to the fact water's dipole electricity is simply too vulnerable to shy away the ions (each anion and cations) from the sturdy crystals of lead sulphate.Lead sulfate seems as a white crystalline solid. Insoluble in water and sinks in water. Contact might also additionally aggravate skin, eyes, and mucous membrane.
Thus, PbSO4 is insoluble. In PbSO4 , the electricity of the dipole is vulnerable to interrupting the anionic and cationic bond. So, PbSO4 stays insoluble in solution.
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Identify if the following substances (a-h) are elements or compounds.
Answer:
Boron, Hydrogen, Helium, Lithium, Beryllium, Carbon, Nitrogen, Oxygen, etc.
Explanation:
These are all elements, not all of them.
Is any of the following an acid?
a. Ba(OH)2
b. H3PO4
c. FeCl3
d. NaC2H3O2
e. No acids are listed.
Answer:
b
Explanation:
The buildup of sediment where a river empties into a slow-moving or nonmoving body of water is known as a/an
A type of soil made almost entirely of windblown sediment is called _______.
The _______ in soil comes from decaying plants and animals and their waste products.
_______, which is made up of tiny particles and drains water very poorly, is one of the main components of soil.
A type of soil called peat is most likely to form in a/an
Water helps in the development of soil by carrying _______ and nutrients from upper layers to lower layers.
The _______ of nutrients from soil is common in wet environments, like rain forests.
Quartz-rich parent material leads to the development of _______ soils.
The layers of soil composed mainly of organic matter are known as the ______ and _______ horizon.
A layer of soil in which clay, iron, and other elements from the overlying soil accumulates is known as the _______ horizon, or subsoil.
ANSWERS:
river delta.
loess
organic matter
Clay
swamp (or wetland).
minerals
leaching
sandy
O and A
B
The buildup of sediment in which a river empties right into a slow-transferring or non transferring frame of water is referred to as a Delta.
What is Delta ?Deltas are wetlands that shape as rivers empty their water and sediment into some other frame of water, together with an ocean, lake, or some other river.
A form of soil made nearly completely of windblown sediment is referred to as Loess.
The natural count number in soil comes from decaying flora and animals and their waste products.
Clay, that's made of tiny debris and drains water very poorly, is one of the essential additives of soil.
A form of soil referred to as peat is maximum probably to shape in a/an Coastal surroundings in Tropical placing.
Water enables withinside the improvement of soil with the aid of using carrying Mineral and vitamins from higher layers to decrease layers.
The Richness of nutrients from soil is not unusualplace in moist environments, like rain forests.
Quartz-wealthy determine cloth results in the improvement of Sandy soils.
The layers of soil composed specifically of natural count number are referred to as the O and A horizon.
A layer of soil wherein clay, iron, and different factors from the overlying soil accumulates is referred to as the B horizon, or subsoil.
Delta is stated to be a frame of sediments deposited whilst a river flows into a status water, together with the ocean or a lake.Loess are wind blown deposits of silts and clay composed of quartz, feldspar and different minerals . Loess dominantly have excessive porosity.Organic subjects compose specifically of stays of animal and flora . After this flora and animals dies they shape natural count number that provides to soil vitamins.Clayey soil represent very tiny debris which have a bad draining cappotential because of it tiny bad spaces .Tropical placing in a coastal surroundings affords the important environments for soils like peat to shape . It has plentiful of plant stays . Moreover peat is the primary degree of coal formation, containing wet and unconsolidated plant substances.Minerals part of what help withinside the improvement of the soil .And additionally it is carried right all the way down to the earth with the aid of using water thru a procedure referred to as Leaching.Richness of nutrient are not unusualplace in tropical surroundings which are moist and help plentiful life.Sandy soil are fashioned from dad and mom substances containing minerals together with feldspar and quartz.Horizon O and A are referred to as topsoil and are specifically compose of animal and flora stays and big quantity of minerals.The subsoil or B Horizons consists of mineral together with irons , clay minerals because of percolation from the pinnacle soils and it has a tendency to build up here(subsoil).Learn more about Horizon here ;
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If 142.5 g of liquid in the coffee-cup calorimeter rises 8.00 °C, how much heat is released by the neutralization reaction?
Q=mcΔt
Q=142.5 x 4.18 x 8
Q = 4.765 x 10³ J
What is an open system?
A. A system that allows energy to move in and out but not mass
B. A system that allows energy and mass to move in and out of it
C. A system that allows mass to move in and out but not energy
OD. A system that does not allow energy or mass to move in or out of
it
Answer:
An open system is :-
B. A system that allows energy and mass to move in and out of it.
Example :-
Water boiling in a pot on a stove. (Without lid).
calculate the molecular weight of carbon dioxide
Answer:
44.01 g/mol
Explanation:
Carbon dioxide is produced when carbon and oxygen are burned.
To totally burn carbon into carbon dioxide, or CO2, we require one mole of oxygen for every gram of carbon by weight.
or alternatively:
You produce 12+216=44 g of carbon dioxide for every 12 g of carbon.
The weight of CO2 in kg may be calculated if the amount of CO2 in litres is known by converting it to moles and multiplying it by 44.
How many moles of CH3CH2Br are contained in 422 mL of 0.0950 M CH3CH2Br solution?
How much heat (in joules) does it take to heat 180 g of water from 24 °C to 66 °C? The heat capacity of water is 4.184 J/(g · °C). You may round your answer to the nearest 100 J
Answer:31,631.04
Explanation: multiply final temp with initial temp = 42 then multiplied by grams = 7,560 then multiplied by J = 31,631.04
Look at the question marks between zinc (Zn) and arsenic (As) . At the time no elements were known with atomic weights between 65.2 and 75
Mendeleev positioned elements in the periodic table in increasing order of their atomic numbers, such that elements having identical chemical properties and characteristics plunge into the same group.
What is Mendeleev's periodic table?Mendeleev's periodic table may be defined as a collection of elements in an increasing atomic mass hierarchy in a table arrangement, such that it reminisces resemblances and manias according to their chemical properties and characteristics.
Mendeleev found that two elements existed between atomic weights 65.2 and 75 because he comprehended especially pleasingly that the possessions of the elements were more comparable and closer to this degree.
He also anticipated having other elements that would have their possessions comparable to these other elements.
Therefore, he departed a void for these two elements in the periodic table until they were ultimately found in their real existence.
The complete question is as follows:
Look at the two question marks between zinc (Zn) and arsenic (As). At the time, no elements were known with atomic weights between 65.2 and 75. But Mendeleev predicted that two elements must exist with atomic weights in this range. What led Mendeleev to predict that two undiscovered elements existed in that range?
Therefore, it is well described above.
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HELP! ASAP!
3. Describe the process of copper-plating. What occurs at the molecular level? Is this considered a physical change or a chemical change? Explain your reasoning.
Copper-plating is a chemical change in which copper ions become neutral copper atoms by accepting electrons which then are deposited on the material to be coated.
What is copper-plating?copper-plating?Copper-plating is the process by which a layer of copper is used to coat another material using the process of electrolysis.
At the molecular level, copper ions in solution accept electrons to become neutral copper atoms which then are deposited on the material, thereby coating.
This is an example of a chemical change since it us not easily reversible and new products are formed.
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Data are often arranged to highlight particular patterns. What other ways might you arrange the data shown in the Sample of Elements table?
The data shown in the Sample of Elements table can be arranged on basis of physical and chemical properties , atomic number , atomic weight , etc .
The data shown in the Sample of Elements table can be arranged in various ways :
On basis of similarity among physical and chemical properties of several groups of three elements , as done by Johann Dobereiner in early 1800’s .On basis of increasing atomic wieghts , as done by A.E.B. de Chancourtois in 1862 and english chemist, John Alexander Newlands in 1865.On basis of the physical properties such as atomic volume, melting point and boiling point against atomic weight as done by Lothar Meyer .On basis of atomic no. as done by the English physicist, Henry Moseley in 1913.Learn more about Sample of Elements table here https://brainly.com/question/15987580
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In your own words, explain why a study published a cereal company that finds that breakfast is the most important meal of the day is likely to contain bias.
Diffrentiate the reactivity of metals and Non-metals with air / oxygen.
Answer:
Both metals and non-metals when burnt in oxygen form their oxides. Oxides of metals are basic in nature and oxides of non-metals are acidic in nature.
Which of these is a reason an engineer may choose to use a prefabricated
building component?
A. She wants to make the building more original and unique.
B. She wants to use standard materials to minimize negative
environmental impacts.
C. She wants to make the building safer.
OD. She is not on a strict timeline.
Answer:
B.
Explanation:
customization requires more material, more machine time which can creates a greater impact on the environment in the sense of pollution (travel by the extra employees, creation of custom materials, increased machine running time). Good luck in your studies. Hope this answers your question in full.
Need answer ASAP!! The specific heat capacity of metal A is twice that of metal B. Based on
this information, which of the following statements is true?
The melting point of metal A is higher than that of metal B
The heat of fusion of metal A is twice that of metal B
If the same amount of heat is absorbed by equal masses of metal A and metal B,
the temperature change of metal A will be twice that of metal B
If the same amount of heat is absorbed by equal masses of metal A and metal B,
the temperature change of metal A will be half that of metal B
Answer:
last choice
Explanation:
Specific heat of a metal is j/kg-c
It says nothing about melting point or heat of fusion
A = twice B = 2 * j/kg-c B = j/kg-c
if j is constant and mass is the same we can write this more like
A = 2 /C and B = 1/C
or A ~ C/2 and B~ C
now you can see that the temp change in A will be 1/2 that of B
Which of the following is the best definition of a physical change?
A. A change in a substance where a new substance is formed
B. A change in a substance in which mass is conserved
C. A change in a substance inwhich bonds are broken
D. A change in a substance with no new substances being formed
D. A change in a substance with no new substances being formed
Explanation:There are 2 ways a substance can change, physical changes and chemical changes. In all changes, physical or chemical, mass is always conserved.
Physical vs. Chemical
The main difference between a physical and chemical change is the substance at the end.
Physical changes do not form new substancesChemical changes do form new substancesNew substances are only created by chemical changes. Additionally, only chemical changes break apart bonds. Physical changes maintain the same compounds and elements, so bonds are not broken.
Examples of Physical Changes
Physical changes do not change the actual substance, but they can change the form of the substance.
MeltingBoilingFreezingCrumblingCuttingBreakingAll of these change the state of matter or shape of the substance, but not the chemical makeup.
Which quantity could best be measured with a meter stick?
A.
the amount of matter in a rock
B.
the width of a wooden block
C.
the volume of water in a cup
D.
the diameter of the Earth
Answer:
B
Explanation:
A meter stick measures distances ( like centimeters) so....B
it does NOT measure mass , volume or VERY large distances (Like earth's diameter)
The quantity could best be measured with a meter stick will be "the width of a wooden block".
What is meter stick?The measurement tool is known as a "meter stick" would be used to measure objects in meters and millimeters.
What is wooden block?A single new piece of wood would be used to create a miniature slit drum known as a wood block.
An instrument for measuring lengths in meters and centimeters is a meter stick, which measures one meter (hundred centimeters). A meter stick can be used to measure things such as the width of a bag or the length of a table.
The quantity that could best be measured with a meter stick will be "the width of a wooden block".
Therefore, the correct answer will be an option (b)
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The average speed of a diatomic fluorine molecule at 25 ∘C is 442.4 m⋅s−1 . What is the average wavelength of a fluorine molecule at this temperature? Assume that the molecule acts as a single particle
The average wavelength of the fluorine molecule will be 2.36 × 10⁻¹¹ metres.
Fluorine Molecule's Speed = 442.4 m/s
The Molar Mass of the F₂ = 38 g/mol
Now as we know that any molecule's
1 mole contain = 6.022 × 10²³ Molecule
So, 1 Fluorine molecule mass =
Fluorine's Molar mass / Number of Fluorine molecule in 1 mole
So, 1 Fluorine molecule mass = 38 / ( 6.022 × 10²³ )
1 Fluorine molecule mass = 6.31 × 10⁻²³ g
1 Fluorine molecule mass = 6.31 × 10⁻²⁶ Kg
So molecule's momentum = Molecule's mass × Molecule's Velocity
So molecule's momentum = ( 6.31 × 10⁻²⁶ ) × 442.4
So molecule's momentum = 2.8 × 10⁻²³ Kg.m/s
Now wavelength of Fluorine molecule = λ = planks constant / momentum
wavelength of Fluorine molecule = λ = ( 6.626 × 10⁻³⁴ ) / ( 2.8 × 10⁻²³ )
wavelength of Fluorine molecule = λ = 2.36 × 10⁻¹¹ metre
So the wavelength of the diatomic fluorine molecule came out to be 2.36 × 10⁻¹¹ metres after applying all the concepts and formulas.
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How many xenon atoms are contained in 1.00 moles of xenon?
Answer:
6.022 x 10²³
Explanation:
The number of atoms = the number of moles x with the Avogadro's number.
(The Avogadro's number is 6.022 x 10²³ atoms / moles)
number of atoms = 1.00 moles x 6.022 x 10²³ atoms / mole
number of atoms = 6.022 x 10²³ atoms
(There is no need to simplify?) = 6.022 x 10²³
(ps. This is my first time doing this question so im sorry if i got it wrong
(つ﹏⊂)
PLEASE HELP CHEMISTRY!!!! Will give brainiest
Show work pls.
2 moles of ZnO are produced if 1 mole of Zn and 2 moles of [tex]O_2[/tex] is required.
What are moles?A mole is defined as 6.02214076 × [tex]10^{23}[/tex] of some chemical unit, be it atoms, molecules, ions, or others. The mole is a convenient unit to use because of the great number of atoms, molecules, or others in any substance.
Balanced equation:
[tex]2 Zn + O_2[/tex] → [tex]2 ZnO[/tex]
For 2 moles of Zinc, we need 1 mol of Oxygen to produce 2 moles of Zinc oxide
For 1 mole Zn, we need 2 mol [tex]O_2[/tex] to produce 2 moles ZnO only.
Hence, 2 moles ZnO is produced.
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We do not want all staff being able to access all records that we hold. How can you ensure traceability and accessibility to the data stored?
To ensure data traceability and accessibility is to complete a study beginning-to-end on a closed system or platform.
How can you ensure traceability and accessibility to the data stored ? Lean On Self-Service Business Intelligence. Embed Dashboards Into Your Teams' Tools. Facilitate Data Literacy Throughout the Company. Embrace Your Changing Role.Learn more about Data accessibility here ;
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Step 5: Measure the Mass of the Water (Iron)
Tare the balance. Put calorimeter (no lid) on the balance.
Measure the mass to the nearest 0.01 g.
g
DONE✔
ZERO
Answer:
12.42 g
Explanation:
because I saw your laptop so it is
Different atoms and elementary particles have varied masses. Therefore, 12.42 g is the Mass of the Water.
What is mass?A body's mass is an inherent quality. Before the invention of the atom or particle physics, it was widely considered to be tied to the amount of matter inside a physical body. It was discovered that, despite having the same quantity of matter in theory, different atoms and elementary particles have varied masses.
There are various conceptions of mass in contemporary physics that are theoretically different but physically equivalent. The resistance of the body to acceleration in the presence of a net force can be measured experimentally as mass. 12.42 g is the Mass of the Water.
Therefore, 12.42 g is the Mass of the Water.
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The energy released per gram of material is __________.
A much larger in nuclear fusion reactions than in chemical reactions
B much smaller in nuclear fusion reactions than in chemical reactions
C the same amount in nuclear fusion reactions as it is in chemical reactions
D insignificantly larger in nuclear fusion reactions than in chemical reactions
Answer:
I'm pretty sure the answer is C.
Magnesium burns in air with a dazzling brilliance to produce magnesium oxide: 2 Mg(s) + O2(g) → 2 MgO(s) How many moles of O2 are consumed when 2.10 mol of magnesium burns?
Answer:
1.05 mols of O2 gas
Explanation:
For this type of problem, it's important to understand what the balanced Chemical equation tells us:
Balanced Chemical equationsLet's look at the balanced chemical equation:
[tex]2Mg(s)+O_2(g)-- > 2MgO(s)[/tex]
This equation two sides of the reaction arrow. On the left are the reactants (things you start with, and that react during the chemical reaction), and on the right side are products (things that are produced during the chemical reaction that you end with).
The numbers in front of each compound tell how many of molecules are involved for a full reaction without anything left over. A "mol" is a large quantity ([tex]6.022*10^{23}[/tex]), in this case, of molecules , since it's unlikely you're only taking a single molecule of each substance (it would be so tiny, you wouldn't even know you were doing the reaction).
So,for every 2 moles of Magnesium used, we'll also need 1 mole of Oxygen, and it will produce 2 moles of Magnesium Oxide.
In a way, during the reaction it's almost like 2 moles of Magnesium is equal to 1 mole of Oxygen and is equal to 2 moles of Magnesium Oxide:
[tex]2 mol Mg(s)=1mol O_2(g)=2molMgO(s)[/tex]
From here, we can build some unit ratios, to convert between the known quantity of moles we have, and find the unknown quantity of moles that are requested.
Finding the right unit ratioWe know that we are looking at 2.10 mol of Magnesium, so we want a unit ratio with moles of Mg on the bottom. We want to find moles of O2, so we want a unit ratio of moles of O2 on top.
The unit ratio we want is the middle part of the equation, divided by the left part of the equation.
[tex]2 mol Mg(s)=1mol O_2(g)\\\frac{2 mol Mg(s)}{2 mol Mg(s)}=\frac{1mol O_2(g)}{2 mol Mg(s)}\\1=\frac{1mol O_2(g)}{2 mol Mg(s)}[/tex]
Since this quantity is 1, it is a unit ratio and can be multiplied to other things to change their units (for this problem).
Finding the answerStarting with what we know, and multiplying by our unit ratio:
[tex]2.10 mol Mg(s)*\frac{1mol O_2(g)}{2 mol Mg(s)}=1.05mol O_2(g)[/tex]
Notice that the units from the first quantity cancel with the units on the bottom of the fraction, leaving only the unit on top of the fraction ... the exact units we wanted!
So, 1.05mols of O2 would be consumed during the reaction if exactly 2.10moles of Magnesium are burned.
Jon does an experiment in which he varies the amount of calcium chloride (CaCl2) powder used for the chemical reaction with sodium bicarbonate (NaHCO3). He plans to observe whether the amount of CaCl2 powder has an effect on reaction rate.
Make the most logical prediction for the results of his experiment using the drop-down menus.
I predict that using a larger amount of calcium chloride powder will
______
a. increase
b. decrease
c. have no effect on
the reaction rate because the calcium chloride molecules will ______
a. have more kinetic energy
b. balance the number of product molecules
c. collide more often with other reactant molecules
Answer:
a.) increase
c.) collide more often with other reactant molecules
Explanation:
Generally, when you increase the quantity of reactants, the rate of the reaction increases (the forward reaction). When there are more reactants, there are more chances for them to interact with each other. More interactions means more reactions.
I predict that using a larger amount of calcium chloride powder will increase the reaction rate because the calcium chloride molecules will collide more often with other reactant molecules.
When does the reaction rate would increase?It becomes fair to assume that the reaction rate would increase when Jon increases the quantity of calcium chloride (CaCl2) powder utilised in the chemical reaction with sodium bicarbonate (NaHCO3).
This is due to the fact that adding more calcium chloride powder to the reaction mixture will add more CaCl2 molecules.
There will be more collisions between CaCl2 and NaHCO3 molecules due to the larger concentration of CaCl2 molecules. Successful collisions between reactant molecules are essential for the production of products in a chemical reaction.
Therefore, a greater reaction rate will result from more CaCl2 and NaHCO3 molecules colliding often. The additional molecules contribute to a higher number of energetic collisions, where the reactant particles possess sufficient energy to overcome the activation energy barrier and undergo the reaction.
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