The given question is complete, the complete question is:
To measure the amount of calcium carbonate (CaCO) in a seashell, an analytical chemist crushes a 4.80 g sample of the shell to a fine powder and titrates it to the endpoint with 515. mL of 0.140 M hydrogen chloride (HCl) solution. The balanced chemical equation for the reaction is: 2HCI(a)Co (a) H2Co,(aq) + 2Cl (aq)
What kind of reaction is this?
If you said this was a precipitation reaction, enter the chemical formula of the precipitate.
If you said this was an acid-base reaction, enter the chemical formula of the reactant that is acting as the base.
If you said this was a redox reaction, enter the chemical symbol of the element that is oxidized
Calculate the mass percent of CaCO in the sample. Be sure your answer has the correct number of significant digits.
Answer:
It is an acid-base reaction and the mass percent of CaCo3 is 75.2%.
Explanation:
A chemical reaction in which an insoluble salt produces from two soluble salts is termed as precipitation reaction.
A reaction in which atleast exchange of one proton takes place between the two species is termed as an acid-base reaction.
A reaction in which any of the element has a change in oxidation state is termed as redox reaction.
In the mentioned reaction, there is a transfer of H⁺, no precipitation is forming, and no change in oxidation state taking place, thus, it is an acid-base reaction.
In the acid-base reaction, the base refers to the species that accepts hydrogen ion or proton. In the given case, CO₃²⁻ is accepting H+ ion to become H₂CO₃. Hence, CO₃²⁻ is the base.
In order to calculate mass percent of CaCO₃, first there is a need to find the moles of HCl reacted for a solution,
Moles = Molarity × Volume (L)
Moles = 0.140 mol/L × 515 × 10⁻³ L
Moles = 0.0721 mol
Now from the balanced equation, one mole of CaCO₃ needs two moles of HCl.
So, moles of CaCO₃ reacted will be,
= 1/2 × 0.0721 = 0.03605 mol
The mass of calcium carbonate taking part in reaction will be,
= Moles × Molar mass
= 0.03605 × 100 gram/mole
= 3.6086 gram
Mass% of CaCO₃ = Mass of CaCO₃/Mass of sample × 100
= 3.6086 grams/4.80 grams × 100
Mass % = 75.2%
When Aluminum foil is added to a solution of Copper (II) chloride (blue color solution), the following reaction occurs.
2 Al. +. 3 CuCl2. ----->. 3 Cu. +. 2 AlCl3
a
Aluminum is more reactive than copper.
b
Cannot determine the reactivity order.
c
Copper is more reactive than Aluminum.
What 2 ions can affect the pH
СH +
О, –
СО, +
НО
What is the balancing equation
Answer:
i would also like to know
Explanation:
plz..............................................
Predict whether each substance will dissolve in water.
Answer:
Dissolves in water
Explanation:
how to balance Cl2(g) + KBr(aq)
Answer:
Cl₂(g) + 2 KBr(aq) ⇒ Br₂(l) + 2 KCl(aq)
Explanation:
Let's consider the unbalanced single displacement reaction between chlorine and potassium bromide.
Cl₂(g) + KBr(aq) ⇒ Br₂(l) + KCl(aq)
We will start balancing Cl atoms by multiplying KCl by 2.
Cl₂(g) + KBr(aq) ⇒ Br₂(l) + 2 KCl(aq)
Finally, to get the balanced equation, we have to multiply KBr by 2.
Cl₂(g) + 2 KBr(aq) ⇒ Br₂(l) + 2 KCl(aq)
Compute the specific heat capacity at constant volume of nitrogen (N2) gas. The molar mass of N2 is 28.0 g/mol.
Answer:Specific heat capacity at Constant volume of Nitrogen =742.32JKg.K
Explanation:
The Specific heat capacity at Constant volume of an ideal gas is given as
c =Cv / M
Cv= Constant volue of gas
M= Molar mass
But First, we determine the Constant volume, Cv which is given as
Cv = 5/2R since Nitrogen is a diatomic gas, N2 where R= 8.314Jmol.k
= 5/2 x 8.314Jmol.K
=20.785Jmol.K
Specific heat capacity at Constant volume, c
c= Cv/M
M=molar mass = 28.0 g/mol.
changing to kg/mol =28/1000= 0.028kg/mol
Therefore c =20.785Jmol.K/0.028kg/mol
=742.32JKg.K
How can you increase the gravitational potential energy (GPE) of an empty shoe box on the bottom shelf of a bookcase?
A. all of the options listed here will increase the GPE
B. add items to the box and raise it to a higher shelf
C. add items to the box to increase its mass
D. raise the box to a higher shelf
We can calculate the about of potential energy in an object using the formula PE = mgh where m is the mass of the object, g is the acceleration due to gravity (which on Earth is a constant 9.8) and h is the height the object is from ground. If I have a 2kg bar of gold and raise that to a shelf mounted 3 meters from the ground what is that objects GPE? Remember to insert the numbers into the formula like this PE = (2)B. (9.8) (3) , you may use your calculator to complete this multiplication problem.
A. 14.8 J
B. 88.2 J
C. 58.8 J
D. 176.4 J
Which is an example of only potential energy
A. a skateboard rolling down a hill.
B. a puppy sleeping on the ground under a tree.
C. an elevator moving up to the 3rd floor.
D. an apple step on top of the teacher’s desk.
If Kinetic energy has the shorted name of energy of motion, what is the shortened name for Potential Energy?
A. Stored energy
B. Joules
C. Newtons
D. Awkward energy
Potential energy can be converted into kinetic energy, a good example of this is when a pole-vaulter bends the pole during a leap. When the pole is bent the most, does it store elastic or gravitational potential energy?
A. Only gravitational potential energy because that is more powerful than elastic potential energy.
B. The pole stores gravitational potential energy because it is bent from its natural shape when off the ground.
C. The pole stores elastic potential energy when the pole is bent because its shape is change from its natural shape and it will want to go back to its original form, just like a spring or stretched elastic material.
D. It has neither elastic or gravitational potential energy.
Is the potential energy of the roller coaster elastic or gravitational?
A. neither
B. gravitational
C. elastic
D. both
In the EXPLORE section of your lesson 4.08 on Potential energy there were several animations to watch that provided a graphic illustrating how the PE and KE in a system changed as skateboarder rides a pipeline or a pendulum moves, why did the bar for the total energy remain constant?
A. Energy is converted from kinetic to potential and potential to kinetic, but the total amount of energy is conserved.
B. Because these models do not take into account the impact of friction and air resistance and are helping to solidify the concept of energy conservation and that the total mechanical energy remains constant in that model.
C. This is because no energy is being created or destroyed in this system.
D. all answers given are correct
In class we learned that a car model with a mass of 5.0 kg that is placed on a track 3.0 m off the ground and is traveling at a speed of 4 m/s. Has a measurable kinetic and potential energy. Calculate the total mechanical energy of the object using the formula ME = KE + PE when the KE is 40 joules and the PE is 147 joules. (You may use your calculator on this addition problem.)
A. 60 J
B. 147 J
C. 40 J
D. 187 J
Answer:someone answer 4 b
Explanation:
123
which proccess do NOT build mountains
Answer:
its does not
Explanation:
not do...................
The moles of MnO4- can be calculated by multiplying the volume of MnO4- required to reach the endpoint multiplied by the molarity of the MnO4- solution. What are the moles of MnO4- used in the titration?
Answer:
See explanation
Explanation:
The molarity of the KMnO4 solution= 0.0815 M
For the first trial;
number of moles = 30.44/1000 * 0.0815 = 2.48 * 10^-3 moles
For the second trial;
number of moles = 31.24/1000 * 0.0815 = 2.55 * 10^-3 moles
For the third trial;
number of moles = 31.89/1000 * 0.0815 = 2.6 * 10^-3 moles
Which of the following situations would cause light to refract?
When light passes from one medium to the other of different density, the light ray will bend. This is called refraction. Light moving from air to water cause refraction. Hence, option d is correct.
What is refraction ?Refraction is a phenomenon in which a light ray bent in its direction when passing from one medium to the other where the mediums have different densities.
The measure of bending of light in a medium is called refractive index of that medium. It depends on the density as well as velocity of light through the medium.
For example, when light passes from air to water or air to glass it bends. We can clearly observe the bending in the light ray at the boundary of the two mediums. Hence, option D is correct.
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The options of your question were as follows:
A. traveling through a vacuum B. passing from one glass block to another C. moving through the air D. moving from air to water.
What happens to water when it changes to ice?
Its density increases.
Its density decreases.
Its mass increases.
Its mass decreases.
Its volume increases.
Its volume decreases
Answer:
Its density decreases
Its volume increases
Explanation:
You notice that ice floats on water, this means that its density is less. The mass remains the same because you did not add or remove anything. But what causes the density to decrease then? For density to change, there needs to be a change in either the volume or the mass of the object. Density is calculate by mass/volume. Since the mass did not change, the volume must have. So in this case, the volume increases. Hence, this is what causes it to be less dense. :)
Answer:
D.
Explanation:
brainliest pls
The reactants in photosynthesis are:
Answer:
Carbon dioxide, sunlight, and water.
Explanation:
Consider the equation CH4 + O2 —> 2H2O + CO2
Which element or elements are unbalanced in this equation?
C, H and O are all unbalanced
Both H and O are unbalanced
Only the H is unbalanced
Only the O is unbalanced
Answer:
O is the only 3lement that is unbalanced
Answer:
The answer is: Only the Ois unbalanced.
Explanation:
I took the test
please answer I need help
Answer:
i dont uderstand collage
Explanation:
tough
but please I need this answer fast and if you don't know it don't answer it D.
Answer:
its just a chromosome getting ready to split in a cell, Its called the telophase and its copying itself for the mother and daughter cell
(03.05 LC)
Look at the image shown
What does this image represent?
1.Linear molecule with one domain
2.Linear molecule with two domains
3.Tetrahedral molecule with four domains
4.Trigonal planar molecule with three domains
Answer:
The correct answer is 4
Explanation:
Boron trifluoride (BF₃) has a molecular geometry (as shown in the image in the question) referred to as trigonal planar; this is because each of the the fluorine atoms/molecules (bonded to the central boron atom) is placed in such a way that they form the three "end points"/"domains" of an equilateral triangle. Hence, the correct option is the last option.
What happens to the abundance of elements as their atomic numbers increase?
Answer:
Their abundance decreases.
Explanation:
Google :)
How many water molecules are in 4 moles of water
Answer:
12.
Explanation:
There are 12 atoms within 4 water molecules.
identify the reactants in the following reaction: 2 ch3oh(l) + 3 o2(g) →2 co2(g) + 4 h2o(g)
Answer:
2 ch3oh(l) + 3 o2(g)
Explanation:
because they are at the beginning and they are what are being changed.
In the given chemical reaction: [tex]\rm 2 CH_3OH(l) + 3 O_2(g) \rightarrow 2 CO_2(g) + 4 H_2O(g)[/tex], the reactants are [tex]\rm CH_3OH[/tex] and [tex]\rm O_2[/tex], respectively.
Reactants are the starting materials or substances that are consumed in a chemical reaction to produce new products.
The reaction is a combustion reaction, where a fuel (in this case, methanol) reacts with oxygen gas to produce carbon dioxide and water vapor.
[tex]\rm 2 CH_3OH(l) + 3 O_2(g) \rightarrow 2 CO_2(g) + 4 H_2O(g)[/tex]
The starting molecules (reactants) in this reaction is [tex]\rm CH_3OH[/tex] and [tex]\rm O_2[/tex], which reacts to produce [tex]\rm 2 CO_2(g)\ and\ \4 H_2O(g)[/tex] as the final product.
Therefore, [tex]\rm CH_3OH[/tex] and [tex]\rm O_2[/tex] are the reactants in the given chemical reaction, respectively.
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PLEASE HELP ME PLEASE
Answer:
1. increase higher 2. it would be decreased.
Explanation:
Writing Chemical Equations
Balance the equation for the reaction of dicarbon tetrahydride with oxygen gas to produce carbon dioxide and water.
Answer:
The prefix di means 2 and the prefix hexa means 6.
As per IUPAC rules you must use the prefixes to indicate the number of atoms of each element in the formula.
So, the proper name for the compound C2H6 is dicarbon hexahydride.
Explanation:
The balanced equation for the reaction of dicarbon tetrahydride with oxygen gas to produce carbon dioxide and water is [tex]\rm C_2H_4 + 3O_2 \rightarrow 2CO_2 + 2H_2O[/tex].
A reaction is a process that involves the transformation of one or more substances into one or more different substances.
The balanced chemical equation for the reaction between dicarbon tetrahydride ([tex]\rm C_2H_4[/tex]) and oxygen gas ([tex]\rm O_2[/tex]) to produce carbon dioxide ([tex]\rm CO_2[/tex]) and water ([tex]\rm H_2O[/tex]) is:
[tex]\rm C_2H_4 + 3O_2 \rightarrow 2CO_2 + 2H_2O[/tex]
In this reaction, two molecules of carbon dioxide and two molecules of water are produced for every molecule of dicarbon tetrahydride and three molecules of oxygen gas that react. The equation is balanced because the number of atoms of each element is the same on both sides of the equation.
Therefore, [tex]\rm C_2H_4 + 3O_2 \rightarrow 2CO_2 + 2H_2O[/tex] is the balanced chemical equation for the reaction of dicarbon tetrahydride with oxygen gas to produce carbon dioxide and water.
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Convert 3.52 × 10^22 atoms of gold to moles
Answer:
5.85 x 10⁻² mol Au
Explanation:
Divide the atoms of gold with Avogadro's number to find the solution.
3. (05.04 MC)
What mass of Hy is needed to react with 8.75 g of O2 according to the following equation: 02(g) +h2g > h20g
H2(g)
0.547 g H2
1.10 g H2
4.38 g H2
17.5 g H2
4. (05.04 MC)
nroduce aluminum chloride according to the following equation.
Answer: Mass of H₂ needed to react with O₂ : 1.092 g
Further explanation
The concentration of a substance can be expressed in several quantities such as moles, percent (%) weight / volume,), molarity, molality, parts per million (ppm) or mole fraction. The concentration shows the amount of solute in a unit of the amount of solvent.
Reaction
O₂(g) + 2H₂(g) → 2H₂O(g)
mass of O₂ : 8.75 g
mol O₂(MW=32 g/mol) :
From the equation, mol ratio of O₂ : H₂ = 1 : 2, so mol H₂ :
Mass H₂ (MW=2 g/mol) :
.546 x 2 = 1.10 g
The term mole concept is used here to determine the mass of hydrogen. The mass of hydrogen is 1.10 g. Thus the correct option is B.
What is a mole?One mole of a substance is defined as that quantity of it which contains as many entities as there are atoms exactly in 12 g of carbon - 12. The formula used to calculate the number of moles is:
Number of moles = Given mass / Molar mass
The balanced equation when H₂ reacts with oxygen is:
2H₂ (g) + O₂ (g) → 2H₂O (g)
The molar mass of oxygen is 16.00 g/mol and the given mass is 8.75. Then the number of moles is:
8.75 g / 16.00 g/ mol = 0.546 mol
In the equation 1 mole of 'O' = 2 mole of 'H'
Then 0.546 mol 'O' = 0.546 × 2 mol of 'H' = 1.092 mol
The mass of H₂ needed to react with 8.75 g of O₂ is:
Mass = Number of moles × Molar mass
Here the molar mass of H₂ is 1.00794 g/mol.
Then the mass is:
1.092 mol × 1.00794 g/mol = 1.10 g.
Thus the correct option is B.
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The solubility of barium carbonate, BaCO3, is 0.0100 g/L. Its molar mass is 197.3 g/mol. What is the Ksp of barium carbonate
Answer:
Ksp = 2.58x10⁻⁹
Explanation:
The equilibrium that takes place is:
BaCO₃(s) ↔ Ba⁺² + CO₃⁻³Ksp = [Ba⁺²] [CO₃⁻³]The molar concentration of Ba⁺² at equilibrium is the solubility. The same can be said about CO₃⁻³:
Ksp = s * sKsp = s²So now we can calculate the Ksp from the solubility, after converting the solubility from g/L to mol/L:
0.0100 g BaCO₃/L ÷ 197.34 g/mol = 5.07x10⁻⁵ mol/LKsp = (5.07x10⁻⁵ mol/L)²
Ksp = 2.58x10⁻⁹3 Points
Vinegar is a mixture of about 5 g of acetic acid in every 95 g of water. Therefore, the acetic acid is the
solvent, and the water is the solute.
True or False?
During beta-oxidation of fatty acids, ___________ is produced in peroxisomes but not in mitochondria. A) acetyl-CoA B) FADH 2 C) H 2 O D) H 2 O 2 E) NADH
Answer:
The correct option is D
Explanation:
Normally, beta-oxidation of fatty acid occurs in the mitchondrial matrix, however, when the fatty acid chains are too long, the beta-oxidation occurs in the peroxisomes where the oxidation is not attached to ATP synthesis but rather transferred (i.e high energy electrons are transferred) to O₂ to form hydrogen peroxide (H₂O₂). This is the major difference between the beta-oxidation that occurs in the peroxisomes to that which occurs in the mitochondria.
na2o3 is nitrogen trioxide why
Answer:
Because it contains 2 molecules of nitrogen and 3 molecules of oxygen
Explanation:
Is the potential energy of the roller coaster elastic or gravitational?
Question 8 options:
both
elastic
gravitational
neither
Answer:
gravitational
Explanation:
Hope this helps :)
When zinc and HCl are reacted, the product is hydrogen gas. You can measure the reaction rate by measuring what?
PLEASE HELP ME
Answer:
measuring the consumption of the products and the rate of conversion of products to reagents
Explanation:
It must be taken into account that the reaction rate also depends on the presence of a catalyst, since these advance the rate of the reaction.
PLEASE HELP MEEEE
What type of sunscreen can best reduce risk of melanoma? SPF 4 used daily SPF 4 used once a month SPF 15 or higher used daily SPF 15 or higher used once a month -this is science-
Answer:
spf 30
Explanation:
its a good sunscreen btw
