Significant figures are the digits within the number that help determine
accuracy.
о
True
о
False

The rate of the reaction between 2CO(g) and CO₂(g) + C(s) can be determined by injecting some CO(g) into a reaction vessel and measuring the total pressure while maintaining the reaction volume constant.

only CO(g) is present initially, the value of the velocity constant and the reaction rate expression can be determined. The velocity constant, also known as the rate constant, is a measure of how fast the reaction proceeds at a given temperature.

The reaction rate expression, on the other hand, represents the relationship between the reactant concentrations and the rate of the reaction.

By measuring the pressure of the reaction mixture over time, the velocity constant and reaction rate expression can be calculated using mathematical formulas and graphs.

Learn more about reaction at https://brainly.com/question/31429329

#SPJ11

A concentration of acetic acid of approximately 0.023 M is required to make a solution with a pH of 3.

The pH of a solution is a measure of its acidity or alkalinity. It is determined by the concentration of hydrogen ions (H+) present in the solution. A lower pH indicates higher acidity, while a higher pH indicates higher alkalinity.

In this case, we are given that the pKa of acetic acid is 4.76. The pKa is a measure of the acid dissociation constant (Ka) and provides information about the strength of an acid. Acetic acid (CH3COOH) is a weak acid, meaning it partially dissociates in water, releasing hydrogen ions.

To calculate the concentration of acetic acid required to achieve a pH of 3, we can use the Henderson-Hasselbalch equation:

pH = pKa + log([A-]/[HA]),

where [A-] represents the concentration of the conjugate base (acetate ion, CH3COO-) and [HA] represents the concentration of the undissociated acid (acetic acid, CH3COOH).

Given that the pH is 3 and the pKa is 4.76, we can rearrange the equation to solve for the concentration of the conjugate base:

[A-]/[HA] = 10^(pH - pKa).

Substituting the values, we find:

[A-]/[HA] = 10^(3 - 4.76) = 10^(-1.76) ≈ 0.023.

Therefore, a concentration of acetic acid of approximately 0.023 M is required to make a solution with a pH of 3.

Learn more about Acetic acid

brainly.com/question/15202177

brainly.com/question/29141213

#SPJ11

λ is the wavelength, directly or inversely proportional to the change in energy, ΔE.

ΔE = hc/ λ

Here, h = planks constant

          c = speed of light

          λ = wavelength

Since h and c are constant.

ΔE = 1/λ

Hence,  λ is the wavelength, directly or inversely proportional to the change in energy, ΔE.

Energy is the quantitative asset this is transferred to a frame or to a physical gadget, recognizable in the overall performance of work and inside the form of heat and light. strength is a conserved quantity—the regulation of conservation of power states that electricity.

Energy exists in lots of different forms. Examples of these are mild power, heat strength, mechanical energy, gravitational energy, electrical power, sound strength, chemical energy, nuclear or atomic energy, and so forth. each form can be converted or modified into the other forms.

Energy is absorbed to interrupt bonds and released when bonds are made. electricity adjustments in a reaction are calculated through bond energies and shown by power diagrams.

Learn more about energy here:-https://brainly.com/question/13881533

#SPJ1

Answer:

Iron is reactant in excess.

Explanation:

It would remain is 1.16 mol.

From the stoichiometry of the reaction, the final molarity of Cr2O7^2- in the solution is 0.044 M.

1) The balanced reaction equation is;

4Cr^3+(aq) + 14HClO(aq) + 14H^+(aq) -----> 28H^+(aq) + 7Cl2(g) + 2Cr2O7^2-(aq)

2) The oxidation number of chromium in Cr2O7^2- is obtained as follows;

2x + 7(-2) = -2

2x - 14 = -2

2x = -2 + 14

2x = 12

x = 6

3) This is an oxidation - reduction reaction because the oxidation number of Cr increased from + 3 to +6.

4) This is because, the reaction produces hydrogen ions causing the pH to decrease.

5) Nitrate does not appear in the balanced reaction equation hence it is a spectator ion.

6) Number of moles of chromium nitrate = 26.5/1000 L × 0.120 M = 0.00318 moles

Since 4 moles of Cr^3+ reacts with 14 moles of hypochlorous acid

0.00318 moles of  Cr^3+ reacts with  0.00318 moles × 14 moles/4 moles =

0.0011 moles

Molarity of hypochlorous acid = 0.0011 moles/0.01 L = 0.11 M

7) If  4 moles of Cr^3+  yields 2 moles of  Cr207^2-

0.00318 moles of  Cr^3+ yields  0.00318 moles ×  2 moles / 4 moles

= 0.00159 moles

Final molarity of   Cr207^2- =  0.00159 moles/(10 mL + 26.5 mL) × 10^-3

= 0.044 M.

Learn more about redox reaction: https://brainly.com/question/13978139

Walt's mistake is described as: "Only dead plants form natural gas. What is natural gas Natural gas is a fossil fuel that is generated deep beneath the earth's surface. It's a colorless, odorless gas that can be utilized as a fuel for vehicles, heating, cooking, and electricity generation.

It is primarily made up of methane, a hydrocarbon chemical compound. When natural gas is produced, it is accompanied by smaller quantities of hydrocarbon liquids and non-hydrocarbon gases.What is the best description of Walt's mistake The best description of Walt's mistake is that he believed "Only dead plants form natural gas. This assertion is incorrect since natural gas is produced by both land plants and animals.

The dead organic matter is then converted into natural gas through a process known as kerogen formation. Hence, the statement "Only dead plants form natural gas" is incorrect, and it is important to make sure your facts are right before making any assertions. the natural gas is not solely formed from dead plants. Land plants and animals can also produce natural gas. The statement "Natural gas only requires extreme pressure to form" is also incorrect because natural gas is created over a long period of time, usually millions of years.

To know more about generation Visit;

https://brainly.com/question/32772113

#SPJ11

Answer:

the ability of a compound to dissolve

Explanation:

salt dissolves in water so it would be soluble.

oil does not dissolve in water so it is not soluble

The polyatomic formyl anion is written as CHO⁻.

The simplified representation of the valence shell electrons in a molecule is known as Lewis Structure. Lewis structure is used to show how the electrons are arranged around individual atoms in a molecule.  Bonding electrons are shown as a line and Electrons are shown as "dots" between the two atoms.

Number of valence electrons:

Carbon atom → 4 e⁻

Oxygen atom → 6 e⁻

Hydrogen atom → 1 e⁻

One negative charge → 1 e⁻

Total number of electrons = 12 e⁻

Least electronegative atom (except H) is C. So the Lewis structure with resonance hybrids is shown in the image.

Hence, octet rule for all the atoms are satisfied.

Learn more about Lewis structure from the link given below.

https://brainly.com/question/20600113

#SPJ4

In the context of atomic orbital (AO) wavefunctions, the terms "radial node" and "nodal plane" refer to different aspects of the wavefunction's behavior.

A radial node is a region in the AO wavefunction where the probability of finding an electron is zero along the radial direction. In other words, it represents a spherical shell where the electron is unlikely to be found. The number of radial nodes is determined by the principal quantum number (n) of the orbital. For example, the 2s orbital has one radial node, while the 2p orbital has no radial nodes.

On the other hand, a nodal plane is a flat plane within the AO wavefunction where the probability of finding an electron is zero along a particular direction. It represents a surface that divides the orbital into two regions of opposite phases. The number of nodal planes is determined by the angular quantum numbers (l and m) of the orbital. For example, the 2s orbital has no nodal planes, while the 2p orbital has one nodal plane (the xz or yz plane).

Radial nodes arise from the radial part of the wavefunction because they depend on the distance from the nucleus. The radial part determines the distribution of the electron density as a function of distance, and the nodes correspond to regions where the density drops to zero.

On the other hand, nodal planes arise from the angular part of the wavefunction because they depend on the orientation and shape of the orbital. The angular part describes the angular distribution of the electron density around the nucleus, and the nodal planes correspond to regions where the phase of the wavefunction changes sign.

In summary, radial nodes are related to the distance from the nucleus and arise from the radial part of the wavefunction, while nodal planes are related to the orientation and shape of the orbital and arise from the angular part of the wavefunction. The 2s orbital has one radial node and no nodal planes, while the 2p orbital has no radial nodes and one nodal plane.

learn more about radial node here

https://brainly.com/question/31829965

#SPJ11

Answer:

the correct answer is 2

Explanation:

i just did this assignment :)

There will be 2 unpaired electrons in p orbital of unpaired electrons present in the ground state of the atoms in Group 4A(14).

The unpaired electrons are those which do not have any pair due to absence of no more electrons and they are highly unstable elements if the electrons are not paired in the orbitals.

There are 4 types of orbitals s, p, d, and f s-orbital consist of one pair of electrons to fill and the p-orbital have 3 blocks which can be filled with 3 pair that is 6 electrons after filling, and two unpaired electrons left in p-orbital.

Therefore, in the ground state of the atoms in Group 4A(14)  2 unpaired electrons in the p orbital of unpaired electrons are present.

Learn more about unpaired electrons, here:

https://brainly.com/question/11636854

#SPJ6

we have obtained expressions for z1 and z2 in terms of z0, c1, and c2. We can now use these expressions to compute z2 given an arbitrary z0, c1, and c2, z1 = (c1 + z0)/√2 + i(c1 - z0)/√2,  z2 = (c2 + z1)/√2 + i(c2 - z1)/√2.

Let's denote the complex numbers as follows:

c1: the center of the first rotation.

c2: the center of the second rotation.

z0: the initial complex number.

z1: the result of rotating z0 around c1 by π/4 counter-clockwise.

z2: the result of rotating z1 around c2 by π/4 counter-clockwise.

To perform these rotations, we use the following formulas:

To rotate a complex number z around a center c by an angle θ counter-clockwise, we can use the formula: z' = c + (z - c) * e²(iθ), where i is the imaginary unit and e²(iθ) is the complex exponential function.

Using these formulas, we can calculate z1 and z2 as follows:

z1 = c1 + (z0 - c1) * e²(iπ/4)

z2 = c2 + (z1 - c2) * e²(iπ/4)

To simplify these expressions, we can use the fact that e²(iπ/4) = 1/√2 + i/√2, which gives us:

z1 = (c1 + z0)/√2 + i(c1 - z0)/√2

z2 = (c2 + z1)/√2 + i(c2 - z1)/√2.

learn more about expressions here:

https://brainly.com/question/14083225

#SPJ4

Here, we have been given the the amount of helium to be 52 amu.

Thus,

$ \red{\leadsto}$ Hence, the number of atoms will be 13 atoms.

\( \\ \)

Yes, I am agree with the evaporating dish is not preheated, then the mass of the anhydrate will be heavier, resulting in a greater value for the anhydrate and a smaller value for "z" in this formula:

CuxCly • zH2O

For such more questions on anhydrate

https://brainly.com/question/31067396

#SPJ8

Answer:

C. METHANE

Explanation:

The blue color of both the ice giants can be contributed to the presence of methane in their upper atmospheres. Methane absorbs most of the red light incident on the planets which makes them appear blue in color.

Answer:

0.025M

Explanation:

As you must see in your graph, each concentration of the experiment has an absorbance. Following the Beer-Lambert's law that states "The absorbance of a solution is directely proportional to its concentration".

At 0.35 of absorbance, the plot has a concentration of:

This will have a substantial impact on the projected molecular weight of the unknown because the calculations will not account for the mass of the test tube and p-xylene. This indicates that the mass of the unknown that is actually used to determine the molecular weight will be less than the real value, leading to an incorrectly low computed molecular weight. This is done  by determining freezing point.

The addition of a solute to a solvent will decrease the freezing point (temperature) of the solvent. The decrease in freezing point (ΔTf) when a nonvolatile, nonionizing  solute is dissolved in a solvent is proportional to the molal concentration, m, of the solute present in the solution.

ΔTf IS Directly proportional to atomic mass (m)

ΔTf = Kf × m

Kf is a constant for a given solvent. Kf is called the molal freezing point depression constant and represents how many degrees the freezing point of the solvent will change when 1.00 mole of a nonvolatile nonionizing  solute dissolves in one kilogram of solvent.

to know more about freezing point, visit;

brainly.com/question/14813723

#SPJ1

The number of grams of iron that contain the same number of atoms as 2.24 g of cobalt is 2.122 g. The mole concept is used here to obtain the mass of iron.

The term mole is known as the quantity of a substance which contains the same number of elementary particles as the number of atoms in 12 g of carbon-12 isotope.

The number of moles of a substance can be calculated as:

Number of moles = Mass of the substance ÷ Molar mass

Here the mass of cobalt is 2.24 g and the molar mass of cobalt is 58.93 g/mol.

Then the number of moles of cobalt in 2.24 g is:

2.24 g ÷ 58.93 g/mol = 0.038 mol

According to the question iron contains same number of atoms as cobalt. Thus, iron has the same number of moles.

The molar mass of iron is 55.85 g/mol. The mass of a substance can be calculated from the number of moles and molar mass by the equation:

Mass = Number of moles × Molar mass

The mass of iron is:

0.038 mol × 55.85 g/mol = 2.122 g

Thus the mass of iron is 2.122 g.

To know more about the mole concept, visit;

https://brainly.com/question/29367909

#SPJ1

Answer:

Confirm the results

Explanation:

Answer:

its the answer from the guy above me so its B

Explanation:

Answer:

The answer would be (b)

Explanation:

False.

Radiation itself does not typically have a green glow, intense heat, crackling sound, or ammonia smell. These descriptions do not accurately represent the properties of radiation.

The emission of energy in the form of particles or electromagnetic waves is referred to as radiation. Our senses cannot immediately notice it. Radiation is measured and detected using specialized apparatus and detectors.

Alpha particles, beta particles, gamma rays, and X-rays are a few examples of different forms of radiation that have unique characteristics and may be identified with the right tools. For instance, ionizing radiation is typically detected using Geiger-Muller counters or scintillation detectors, whereas radiation exposure is measured using dosimeters.

For precise radiation risk identification and protection, it's crucial to rely on the right detection tools and follow safety procedures.

To know more about radiation:

https://brainly.com/question/31106159

#SPJ4

Answer:

pH = 12.6

Explanation:

The HF reacts with LiOH as follows:

HF + LiOH → LiF + H₂O

To solve this question we need to find the moles of each reactant:

Moles HF:

0.1500L * (0.20mol / L) = 0.030 moles HF

Moles LiOH:

0.600L * (0.10mol / L) = 0.060 moles LiOH

That means there is an amount of LiOH in excess, that is:

0.060 mol - 0.030 mol = 0.030 moles LiOH

In 600.0mL + 150.0mL = 750.0mL = 0.750L

The molarity of LiOH is:

0.030 moles LiOH / 0.750L =

0.040M LiOH = [OH⁻]

As:

Kw = 1x10⁻¹⁴ = [H⁺] [OH⁻]

1x10⁻¹⁴ = [H⁺] [0.040M]

2.5x10⁻¹³M = [H⁺]

As pH = -log [H⁺]

Among the given options, the functional group that cannot hydrogen bond with itself is: 1) Ethers Ethers, which have the general formula R-O-R', consist of two alkyl or aryl groups bonded to an oxygen atom.

While oxygen is capable of forming hydrogen bonds with hydrogen atoms from other functional groups, ethers themselves do not have hydrogen atoms directly bonded to the oxygen atom. As a result, ethers lack the necessary hydrogen bonding donor or acceptor sites required for intermolecular hydrogen bonding.

2) Tertiary amines: Although they lack a hydrogen atom directly bonded to the nitrogen atom, they can still participate in hydrogen bonding as hydrogen bond acceptors.

3) Esters: The oxygen atom in the ester functional group can act as both a hydrogen bond donor and acceptor, enabling intermolecular hydrogen bonding.

4) Carboxylic acids: Carboxylic acids have a hydrogen atom bonded to the oxygen of the carboxyl group, making them capable of forming hydrogen bonds with other carboxylic acid molecules through the oxygen and hydrogen atoms.

Learn more about functional group here: brainly.com/question/31328777

#SPJ11

Cation ion occur when an atom loses electron whereas anion occur when an atom gains an electron.

NaCl is known as sodium chloride. Sodium loses one electron and chlorine accepts that one electron. On sodium cation ion appears after losing electron whereas, on chlorine anion ion appears due to the accepting of electron.

KBr is known as Potassium bromide. Potassium has one outermost electron o it loses one electron and bromine needs one electron so it accepts that one electron. On potassium cation ion appears after losing electron whereas, on bromine anion ion appears due to the accepting of electron.

CaO is also known as calcium oxide. Calcium has two outermost electron so it loses two electrons which leads to two cations on it while on the other hand, oxygen needs two electron so it accepts that two electrons which causes the appearance of two anion ions.

MgO is known as magnesium oxide. Magnesium has two outermost electron so it loses two electrons which leads to two cations on it while on the other hand, oxygen needs two electron so it accepts that two electrons which causes the appearance of two anion ions on it.

BaCl2 is called barium chloride. Barium has two electrons in its outermost shell so it loses two electrons which leads to the appearance of two cations on it while on the other hand, chlorine needs one electron so two chlorine atoms are needed to accept that two electrons which causes the appearance of two anion ions on chlorine atom.

Learn more about cation and anion here: https://brainly.com/question/14309645

Learn more: https://brainly.com/question/26087635

Answer:  The intertidal or littoral zone maintains a balance between the land and the sea. It provides a home to specially adapted marine plants and animals.

Explanation: The intertidal zone is the area where the ocean meets the land between high and low tides. A tide pool within Monterey Bay National Marine Sanctuary. Intertidal zones exist anywhere the ocean meets the land, from steep, rocky ledges to long, sloping sandy beaches and mudflats that can extend for hundreds of meters.

Answer:

Mg + 2H2O → Mg(OH)2 + H2, is normally sluggish, but it becomes reasonably rapid when a milled composite of powdered magnesium metal and powdered iron (1−10 mol %) is used with sodium chloride solutions.

The mass of the displaced fluid can be expressed in terms of the density and its volume, m = ρV. The fluid displaced has a weight W = mg, where g is acceleration due to gravity. Therefore, the weight of the displaced fluid can be expressed as W = ρVg.

Answer:

Color Change.

Production of an odor.

Change of Temperature.

Evolution of a gas (bubbles)

Precipitate (formation of a solid)  

There are 5 so you can choose 4.

The four signs that a chemical reaction has occurred are as follows:

A chemical reaction may be defined as a process that significantly involves the chemical transformation of one set of chemical substances to another. This process involves the utilization of substances known as reactants that are transformed into other substances known as products.

Every chemical reaction involves the four signs which are mentioned above. These signs are delivered by chemical reactions along with determined products. But the mass of the reactants and products always remains the same. Precipitation is only visualized in specific reactions with the possessions of certain characteristics.

Therefore, the four signs that a chemical reaction has occurred are well-mentioned above.

To learn more about Chemical reactions, refer to the link:

https://brainly.com/question/11231920

#SPJ2

Answer:

The arrows are moving in the same direction so you will add the two forces 50N and 30N

Net force = 50 N + 30 N = 80N

and the box will move in the direction of arrow (ie, the same direction of force applied)