the apparatus above was used to collect the oxygen that was produced by elodea. whichfactor was most responsible for the production of oxygen by elodea?

The product that is a precipitate is ZnS(s), which will appear as a solid in the solution. A displacement reaction can be described as one in which a more active substance displaces a less active substance from its compound.

To predict the products, we need to use the double displacement reaction. When Na₂S (aq) and ZnSO₄(aq) are mixed together, they will exchange partners to form Na2SO4(aq) and ZnS(s).
Na₂S (aq) + ZnSO₄(aq) —> Na₂SO₄(aq) + ZnS(s).

A double displacement reaction can be described as a kind of chemical reaction in which the reactant ions exchange places to be new products. Usually, a double displacement reaction is present in the precipitate formation. The chemical bonds between the reactants may be either covalent or ionic.

You can learn more about the double displacement reaction: https://brainly.com/question/29307794

#SPJ11

The type of plot that can be used to determine λ max of a solution is Absorbance vs wavelength.

The correct option is C.

The plot of absorbance vs wavelength is called an absorption spectrum or an absorbance spectrum.

In this plot, the x-axis represents the wavelength of light, usually in nanometers (nm), and the y-axis represents the absorbance of the sample at that particular wavelength. The absorbance is a measure of how much light is absorbed by the sample at a specific wavelength.

The absorption spectrum is used to identify the wavelengths at which a substance absorbs light and can be used to determine the identity or concentration of the substance. The pattern of peaks and troughs in the absorption spectrum is unique to each substance, making it a useful tool in analytical chemistry and biochemistry.

Learn more about absorbance and wavelength at: https://brainly.com/question/28178230

#SPJ1

Answer:

PFAS molecules are made up of a chain of linked carbon and fluorine atoms. Because the carbon-fluorine bond is one of the strongest, these chemicals do not degrade in the environment.

Answer:

B. shape of wings

Explanation:

Insect, (class Insecta or Hexapoda), any member of the largest class of the phylum Arthropoda, which is itself the largest of the animal phyla. Insects have segmented bodies, jointed legs, and external skeletons (exoskeletons).

Higher classification: Hexapoda

Answer:

The oxidation state of hydrogen is +1 in its compounds, except for metal hydrides, such as NaH, LiH, etc., in which the oxidation state for H is -1. The oxidation states of other elements are then assigned to make the algebraic sum of the oxidation states equal to the net charge on the molecule or ion.

The oxidation state of a lone element is that It is its most likely oxidation state, and it is the same as in a compound. The correct options are A and D.

The oxidation state or oxidation number is a hypothetical charge that is given to the elements when they lose or gain an electron. When elements combine, they form bonds with each other. When bonds are formed, the atoms share electrons with each other.

The element that gains electrons, get a negative charge, and the atom that donates electrons gain a positive charge. The number of charges increased as per electrons. The oxidation state of a lone element is most likely the oxidation state and the same as in a compound.

Thus, the correct options are A. It is its most likely oxidation state and D. It is the same as in a compound.

Learn more about the oxidation state, here:

https://brainly.com/question/11313964

#SPJ5

Answer:

Adenine(A) with Thymine(T)

Guanine(G) with Cytosine(C)

bare

Explanation:

The four bases in DNA are adenine (A), cytosine (C), guanine (G), and thymine (T). These bases form specific pairs (A with T, and G with C).

Answer:

DNA base pair. Under normal circumstances, the nitrogen-containing bases adenine (A) and thymine (T) pair together, and cytosine (C) and guanine (G) pair together. The binding of these base pairs forms the structure of DNA.

Answer:

- Bubbles were produced when iron was placed in acid.

- Two liquids were combined, and a solid appeared.

- A white substance turns blue when water was added.

Explanation:

A chemical change can be identified when the original substance changes to a different one.

The following cases are chemical changes:

- Bubbles were produced when iron was placed in acid, because the bubbles represent that a gaseous substance was formed.

- Two liquids were combined, and a solid appeared, because the solid is a new substance that precipitated.

- A white substance turns blue when water was added, because the color change means a new substance was formed.

A beaker containing 1.00 L of 2.00 M LiCl is allowed to sit undisturbed in a warm room. The new concentration of the lithium chloride solution is 2.16 M.

The number of moles of LiCl initially present in the solution is:

moles of LiCl = concentration x volume = 2.00 M x 1.00 L = 2.00 mol

After the water has evaporated, the number of moles of LiCl in the solution is still 2.00 mol, since no LiCl has been lost or added.

The new volume of the solution is 0.925 L.

Calculate the new concentration of the solution using:

New concentration = moles of LiCl / new volume

New concentration = 2.00 mol / 0.925 L

= 2.16 M

To learn more about the concentration, follow the link:

https://brainly.com/question/10725862

#SPJ1

Answer:

c

Explanation:

got it right on my test

Answer:

The answer is: C aka covalent bond

Explanation:

Happy to help

Approximately 6.14 grams of oxygen are produced during the decomposition of lead nitrate when 11.5 grams of NO is formed.

To determine the number of grams of oxygen produced during the decomposition of lead nitrate, we need to know the balanced chemical equation for the reaction. Since the equation is not provided, I will assume a balanced equation based on the information given.

The balanced equation for the decomposition of lead nitrate is as follows:

2 Pb(NO3)2 -> 2 PbO + 4 NO2 + O2

From the balanced equation, we can see that for every 2 moles of lead nitrate (Pb(NO3)2) decomposed, 1 mole of oxygen (O2) is produced. We can use this information to calculate the number of moles of oxygen produced.

First, we need to convert the given mass of NO (11.5 g) to moles. The molar mass of NO is approximately 30.01 g/mol (14.01 g/mol for nitrogen + 16.00 g/mol for oxygen). Therefore, the number of moles of NO is:

moles of NO = mass of NO / molar mass of NO

moles of NO = 11.5 g / 30.01 g/mol ≈ 0.383 moles

Since the balanced equation shows that 2 moles of lead nitrate produce 1 mole of oxygen, we can use this ratio to calculate the number of moles of oxygen produced:

moles of O2 = moles of NO / 2

moles of O2 = 0.383 moles / 2 ≈ 0.192 moles

Finally, we can convert the number of moles of oxygen to grams using the molar mass of oxygen (approximately 32.00 g/mol):

grams of O2 = moles of O2 × molar mass of O2

grams of O2 = 0.192 moles × 32.00 g/mol ≈ 6.14 g

Therefore, approximately 6.14 grams of oxygen are produced during the decomposition of lead nitrate when 11.5 grams of NO is formed.

Learn more about balanced equation here :
brainly.com/question/31242898

#SPJ11

Answer:

Charge is conserved due to the groups in which Lithium and Chlorine are located in the periodic table of the elements.

Explanation:

In the reaction \(Li + Cl - > LiCl\), we can examine the groups in which Li and Cl are found in the periodic table of the elements. Lithium appears in Group 1A, or the alkali metals group, indicating that it carries a charge of +1. Chlorine appears in Group 7A, or the halogen group, indicating that it carries a charge of -1. Because LiCl's constituent elements carry the same charges as previously mentioned, LiCl will have an overall charge of 0.

The chemical equation can then be rewritten as \(Li^{+} + Cl^{-} - > LiCl\), which, if looking at the individual charges of Li and Cl in lithium chloride, becomes \(Li^{+} + Cl^{-} - > Li^{+}Cl^{-}\). Adding the charges on the reactant and product sides of this chemical equation gives us zero in both locations, meaning that we have a charge of 0 on the reactant side and a charge of 0 on the product side. This indicates that charge is conserved in this reaction.

Another way to look at this is expressed in the valence electrons of Li and Cl. Li has an electron configuration of \(1s^{2}2s^{1}\), where the n = 2 electron shell has one of eight total electrons needed to fill the valence shell. This means that Li will easily lose one electron in order to have an electron configuration where the n = 1 electron shell is full, \(1s^{2}\), and become the \(Li^{+}\) ion. Similarly, Cl has an electron configuration of \(1s^{2}2s^{2}2p^{6}3s^{2}3p^{5}\) (or \([Ne]3s^{2}3p^{5}\)), meaning that the n = 3 electron shell is one electron away from becoming complete. Cl will easily gain one electron to have the electron configuration \([Ne]3s^{2}3p^{6}\) (or \([Ar]\)) in order to have an electron configuration where the n = 3 electron shell is full, \(3s^{2}3p^{6}\), and become the \(Cl^{-}\) ion. Thus, when Li and Cl bond, Li will lose the electron \([1, 0, 0, +\frac{1}{2}]\) and transfer it to Cl, where it will become the electron \([3, 1, 1, -\frac{1}{2}]\), thus conserving charge, as there is an equal total number of electrons before and after the reaction.

We would need six moles of magnesium hydroxide in the reaction.

We must note that the reaction that we want to deal with here is a neutralization reaction and the reaction would involve the combination of the hydrochloric acid and the magnesium hydroxide molecule.

The equation of the reaction is something like this;

2HCl + Mg(OH)2 ----> MgCl2 + 2H2O

We have from the balanced reaction equation;

1 mole of magnesium hydroxide would yeild 2 moles of water

x moles of magnesium hydroxide would yeild 12 moles of water

x = 1 * 12/2

= 6 moles

Learn more about reaction:https://brainly.com/question/28984750

#SPJ1

Answer: 1. Endoplasmic Reticulum

Explanation:

it has passageways that carry proteins and other materials from one part of the cell to another

Answer:

0.600 is yourr answer and if wrong sorry  

Explanation:

0.600 mol of potassium contain \(3.6 * 10^{23}\) atoms of potassium.

C. 0.600 mol

A mole is the amount (10) of material containing  \(6.022*10^{23}\) particles . This number is also called Avogadro's number.

Given:

Atoms of potassium = \(3.3*10^{23} atoms\)

To find:

Moles of potassium =?

As we know,

\(1 mole = 6.022*10^{23} atoms\\\\1 atom = 1 / 6.022*10^{23} mole\\\\3.3*10^{23} atoms = 1 / 6.022*10^{23} mole * 3.3*10^{23} atoms\\\\3.3*10^{23} atoms=0.600 mol\\\\\)

Thus, 0.600 mol of potassium contain  \(3.6 * 10^{23}\) atoms of potassium.

Therefore, option C is correct.

Find more information about One mole here:

brainly.com/question/15356425

At 1298K temperature, the reaction ΔG0 value is calculated to be -100,329 J. The thermodynamically stable phases are Cu(s) and CuO.

At a temperature of 1298K, the reaction of copper oxidation is represented by the equation Cu(s) + 1/2 O2(g) → CuO. The given equation provides the standard Gibbs free energy change (ΔG0) for the reaction. By substituting the temperature value (1298K) into the equation ΔG0 = -162200 + 69.24T J (298K-1356K), we can calculate the ΔG0 value.

Plugging in the values, we get ΔG0 = -162200 + 69.24 * 1298 J = -100,329 J. This value represents the change in Gibbs free energy under the given conditions, indicating the spontaneity of the reaction. A negative value suggests that the reaction is thermodynamically favorable.

Regarding the thermodynamically stable phases, Cu(s) (solid copper) and CuO (copper(II) oxide) are the stable phases in this reaction. The symbol "(s)" denotes the solid phase, and "(g)" represents the gaseous phase. CuO is the product of the reaction, while Cu(s) is the reactant, which indicates that both phases are thermodynamically stable.

Learn more about Thermodynamically

brainly.com/question/1368306

#SPJ11

Answer:

A) The substance is in the gas phase only in "region 5".

B) The substance is in both the liquid and solid phase in "region 2"

C) The substance is only in the liquid phase in "region 3".

D) The melting point is the temperature at "region 2".

E) The boiling point is the temperature at "region 4".

Explanation:

The graph is a graph of the solid, liquid, vapour phase change diagram.

In phase 1, the substance is ice which is the solid phase.

In phase 2,it undergoes melting in a forward reaction.

In phase 3, the melting from phase 2 has now changed to water which is liquid phase.

In phase 4, the substance is undergoing a forward reaction known as evaporation.

In phase 5, the evaporation from stage 4 will turn the liquid into vapour known as the gas phase.

A) The substance is in the gas phase only in "region 5".

B) The substance is in both the liquid and solid phase in "region 2"

C) The substance is only in the liquid phase in "region 3".

D) The melting point is the temperature at "region 2".

E) The boiling point is the temperature at "region 4".

The change of state of a substance occurs when heat is either added or removed from the substance.

Change of state is a process in which a substance changes from one state of matter to another due to heat changes.

From the graph given:

Learn more about change of state at: https://brainly.com/question/9007095

#SPJ5

The moles of NaF that must be dissolved in 1.00 liter of a saturated solution of PbF₂ at 25˚C to reduce the [Pb²⁺] to 1 x 10⁻⁶ molar is 2.0 x 10⁻⁵.

The solubility product expression for PbF₂ is given by:

At equilibrium, the product of the ion concentrations must be equal to the solubility product constant. We are given that the [Pb²⁺] in the saturated solution is 1 x 10⁻⁶ M. Therefore, we can use the Ksp expression to calculate the concentration of F- in the solution:

Now, we can calculate the amount of NaF needed to reduce the [F⁻] concentration to 2.0 x 10⁻¹ M. Since NaF is a 1:1 electrolyte, the concentration of F- will be equal to the concentration of NaF added.

However, we need to dissolve this amount of NaF in a saturated solution of PbF₂. Therefore, we need to check that the amount of NaF we added will not exceed the maximum amount that can dissolve in the solution at 25˚C.

To learn more about solubility, here

https://brainly.com/question/29661360

#SPJ4

Answer: A change in appearance. (Please say thanks!)

Explanation:

The biggest sign of a chemical change is change in appearance.

Answer:

d

Explanation:

Answer:

you will have to use T = 1/10

Explanation:

this question was answered in a couple weeks with the same question I did u do not want me and my dad did it all over and u just said it is not going well and you don't want me and my mom and dad don't mind if I can come up to the mall and pick them out on my own and I can come

Answer:

Explanations:

Given the following electronegativity of three elements as:

Answer:

the force has to increase aswell

Explanation:

force and mass have a direct relationship meaning when one increases the other will. the heavier something is, the more force u have to put in order to get it to move!!

If the mass increases than the gravitational attraction between them increases as well as force also increases.

Force is defined as a push or pull on an object caused by its interaction with another thing.

It is a vector quantity, which implies it has both magnitude and direction.

There are basically five types of force

Force can be expressed as

Force = mass x acceleration

With increases in mass the force will also increases and acceleration will also increases.

Thus, If the mass increases than the gravitational attraction between them increases as well as force also increases.

To learn more about force, refer to the link below:

https://brainly.com/question/13191643

#SPJ5

From the balanced chemical equation:

Fe2O3(s) + 3CO(g) → 2Fe(l) + 3CO2(g)

We can see that for every 1 mole of Fe2O3, we produce 2 moles of Fe. Therefore, to produce 12 moles of Fe, we need 6 moles of Fe2O3.

In the chemical equation, the stoichiometric coefficient of Fe2O3 is 1. This means that for every 1 mole of Fe2O3, we can produce 2 moles of Fe. Since we want to produce 12 moles of Fe, we need to scale up the amount of Fe2O3 proportionally.

By multiplying the stoichiometric coefficient of Fe2O3 by 6, we find that 6 moles of Fe2O3 are needed to produce 12 moles of Fe. Therefore, the correct answer is 6 moles.

In summary, to produce 12 moles of Fe according to the given balanced chemical equation, 6 moles of iron oxide (Fe2O3) are required.

To know more about iron oxide  click this link-

https://brainly.com/question/32307053

#SPJ11

hydrated cucl2 have blue-green colour

It turned out instead that some carbon 14 from the environment had contaminated the charcoal from the last part, would the true age of the same be (lower) / estimation is younger than its true age  Contaminated samples, naturally, will have inaccurate results.

Radiocarbon dating has revolutionized how we think about the last 50,000 years. In 1949, Professor Willard Libby established the first radiocarbon dates. He later won the Nobel Prize for his work on dating by contrasting the three distinct carbon isotopes. The number of protons in the nuclei of different isotopes of a given element are the same, but the number of neutrons varies. This indicates that they have distinct masses despite having extremely similar chemical properties.

The number superscript denotes the isotope's total mass. The heaviest isotope, 14C (radiocarbon), is radioactive while the lighter isotopes, 12C and 13C, are stable. This indicates that because its nucleus is so massive, it is unstable. 14C decomposes to nitrogen over time (14N). The majority of 14C is created in the upper atmosphere when neutrons from cosmic rays interact with 14N atoms. After that, it undergoes oxidation to produce 14CO2, which is released into the atmosphere where it mixes with 12CO2 and 13CO2. After being utilized by plants for photosynthesis, this CO2 moves up the food chain.

Find out more about Carbon dating

brainly.com/question/29581952

#SPJ4

Calcium carbonate (CaCO3) is an important component of coral reefs. 0.986 moles are in 98.6 g of CaCO3.

The term mole is defined as the amount of substance of a system which contains as many elementary entities.

One mole of any substance is equal to 6.023 × 10²³ units of that substance such as atoms, molecules, or ions. The number 6.023 × 10²³ is called as Avogadro's number or Avogadro's constant.

Number of moles of CaCO3 = Mass / Molar mass

Number of moles of CaCO3 = 98.6 g / 100g/ mol

= 0.986 moles

The balanced chemical equation of this reaction is as follows:

CaCO₃ → CaO + CO₂

Therefore, the reaction ratio is 1:1:1.

So, 0.986 moles of CaO are formed.

Thus, 98.6 g CaCO3 = 0.986 moles CaCO3.

To learn more about the mole, follow the link;

https://brainly.com/question/26416088

#SPJ1

The range of the of the oxidation number of the first transition series is +2 to +6.

Transition elements or transition metals are elements or metals that have partially filled d orbitals.

The first main transition series begins with either;

Thus, the range of the of the oxidation number of the first transition series is +2 to +6.

Learn more about oxidation number here: https://brainly.com/question/27239694

#SPJ1