1.
How did Wegener use the shapes of
the continents as evidence that the
continents had moved?

Pb⁺²(aq) + CO₃⁻²(aq) →  PbCO₃ (s)

The net ion equation removes ions that have equal moles on both sides. Therefore, Na⁺¹ and NO3⁻¹ have equal molarity on both sides, so we removed them.

In the net ionic equation we write only the ions that participate in the reaction. If the system has the same molar number of ions in the initial and final stages, they will be quenched because they are in the same amount and in the form of ions in the reaction medium. To formulate the ionic equation, simply cancel out ions with the same moles in the initial and final stages.  

Pb⁺²(aq) + CO₃⁻²(aq) →  PbCO₃ (s)

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Answer: When they do, they transfer some of their energy. The energy is transferred from particle to particle. It is sort of like a row of dominoes falling over. In this process, thermal energy moves through a substance. It can even move into other nearby substances. In Figure above, conduction occurs between particles of the metal in the pot. It also occurs between particles of the pot

Explanation:

The name of the organic compound CH₃CH₂CH₂CH₃ is butane.

Butane is an alkane with four carbon atoms and a straight chain. The prefix "but-" indicates four carbon atoms, and the suffix "-ane" indicates that the molecule is an alkane with all single bonds between the carbon atoms.

The molecular formula for butane is C₄H₁₀. Butane is a highly flammable gas at room temperature and pressure, and it is commonly used as a fuel for lighters, camping stoves, and other portable heaters. It is also used as a refrigerant, propellant, and solvent in various industrial applications.

It is a member of the homologous series of alkanes, which have the general formula CnH₂n+2, where n is the number of carbon atoms in the molecule.

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a) The absolute pressure at point B cannot be determined based on the given information.

b) The relative pressure at point F, with respect to the air in the tank, is also indeterminable with the provided information.

a) The absolute pressure at point B cannot be determined because the information about the liquid levels or the densities of the liquids in the tank is not provided.

The absolute pressure depends on the height of the liquid column and the density of the liquid, which are missing from the given data. Without this information, it is not possible to calculate the absolute pressure at point B.

b) The relative pressure at point F, with respect to the air in the tank, is also indeterminable. To calculate the relative pressure, we need to know the absolute pressure at point F and subtract the atmospheric pressure.

However, the absolute pressure at point F is not given, so we cannot determine the relative pressure. Additionally, the value of atmospheric pressure (Patm) provided is not relevant to calculating the relative pressure at point F.

In order to determine the absolute pressure at point B or the relative pressure at point F, we would need additional information such as the liquid levels in the tank, the densities of the liquids, and possibly the atmospheric pressure at point F.

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The decay of a free (not in a nucleus) neutron results in the following particles:

1. Proton: A neutron decays into a proton, which is a positively charged subatomic particle found in the nucleus of an atom.

2. Electron: During the decay process, an electron is also emitted. This electron is a negatively charged subatomic particle and is often referred to as a beta particle (β-).

The decay process of a neutron can be represented as follows:

neutron → proton + electron + antineutrino

So, the resulting particles of the decay of a free neutron are a proton, an electron, and an antineutrino.

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The reaction that follows the law of conservation of mass is \(\rm 2\;H_2\;+\;O_2\;\rightarrow\;2\;H_2O\). Thus, option C is correct.

The law of conservation of mass has been stating that in a chemical reaction, the mass at the product and reactants has been equal.

The atoms has been conserved in the reaction that follows the law of conservation of mass.

The moles of reactants and products in the following reactions has been:

A. \(\rm H_2\;+\;O_2\;\rightarrow\;H_2O\)

Hydrogen: The atoms in reactant=2

Atoms in product=2

Oxygen: The atoms in reactant=2

Atoms in product=1

The product and reactant are not equivalent, thus it not follows the law of conservation of mass.

B. \(\rm H_2\;+\;O_2\;\rightarrow\;H_2O\;+\;4\;He\)

Hydrogen: The atoms in reactant=2

Atoms in product=2

Oxygen: The atoms in reactant=2

Atoms in product=1

He: The atoms in reactant=0

Atoms in product=4

The product and reactant are not equivalent, thus it not follows the law of conservation of mass.

C. \(\rm 2\;H_2\;+\;O_2\;\rightarrow\;2\;H_2O\)

Hydrogen: The atoms in reactant=4

Atoms in product=4

Oxygen: The atoms in reactant=2

Atoms in product=2

The product and reactant are equivalent, thus it follows the law of conservation of mass.

D. \(\rm \;H_2\;+\;O_2\;\rightarrow\;2\;H_2O\)

Hydrogen: The atoms in reactant=2

Atoms in product=4

Oxygen: The atoms in reactant=2

Atoms in product=2

The product and reactant are not equivalent, thus it not follows the law of conservation of mass.

The reaction that follows the law of conservation of mass is \(\rm 2\;H_2\;+\;O_2\;\rightarrow\;2\;H_2O\). Thus, option C is correct.

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According to the Department of Transportation (DOT), hazardous materials are defined as materials that can pose an unreasonable risk to health, safety, or property during transportation.

These materials can include explosives, flammable gases and liquids, toxic substances, radioactive materials, and more. The DOT has specific regulations in place for the transportation of these materials to ensure that they are handled and transported safely to minimize the risk of accidents or harm.

These regulations include:

It is important to follow these regulations to prevent accidents and protect the health and safety of those involved in the transportation of hazardous materials.

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Answer:

zn +2Agno3= Zn(No3)2 +2Ag

A chemical with a formula of SrBr2 will contain 35.4% sr & 64.6% br, in accordance with the stated assertion.

Chemically, strontium bromide has the chemical SrBr2. It is an inorganic compound that is white and odorless at room temperature. In a lab experiment, strontium bromide produces a vivid red color that shows the presence of potassium ions. Along with being utilized in flares, it also has some medical use.

In this case, we first convert the percent composition to moles:

35.4 g Sr / 87.62 g/mol = 0.404 mol Sr

64.6 g Br / 79.904 g/mol = 0.808 mol Br

0.808 mol Br / 0.404 mol Sr = 2.00

Sr:Br = 1:2

So, the empirical formula of the compound is SrBr2.

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Answer:

5 mol Xe × 6.02×10^23

------------ ----------------

1 1 mol Xe

3.01x10^24

I would calculate on your calculator to make sure

ANSWER:

all of them

Explanation:

preciseness is measured by how many decimal places are used not by accuracy. since all of these are to the same decimal place they are all equally precise even if they are inaccurate.

The pH of a buffer solution is determined by the concentration of the weak acid and the conjugate base present in the solution. When 0.0015 mol of Ba(OH)2 is added to 0.210 L of a solution containing 0.250 m of weak acid Hy and 0.110 m y-, the pH of the solution will be affected.

The amount of Ba(OH)2 added is small enough to not cause a drastic change in the pH, but it will still be higher than it was before the addition. The pH of the solution can be calculated by taking the ratio of Hy to y- and then using the Henderson-Hasselbalch equation, which states that the pH of a buffer solution is equal to the pKa of the weak acid plus the log of the ratio of the weak acid to the conjugate base.

After the addition of the Ba(OH)2, the ratio between Hy and y- will change, which will cause the pH to change as well. The exact pH of the solution can be calculated by taking into account the amount of Ba(OH)2 added, the initial concentrations of Hy and y-, and the pKa of the weak acid.

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The scientist can conduct an experiment to determine the amount of base that can be added to a solution before the pH changes.

Here's a step-by-step approach:
1. Prepare a solution with a known pH.
2. Add a small amount of base to the solution and measure the pH using a pH meter.
3. Gradually increase the amount of base added while recording the pH at each step.
4. Observe the point at which the pH starts to change significantly.
5. Repeat the experiment multiple times to ensure accuracy and consistency.
6. Calculate the average amount of base required to cause a noticeable change in pH.
7. This average value will indicate the approximate amount of base that can be added before the pH changes significantly.

For example, if the scientist starts with a solution of pH 7 and notices a significant pH change when 10 mL of base is added, then they can conclude that around 10 mL of base is the threshold before the pH changes.
Remember, the experiment can be repeated with different solutions or bases to gather more data and ensure reliable results. The scientist should also consider using appropriate safety measures and equipment during the experiment.
Overall, this experiment will help the scientist understand the relationship between the amount of base added and the resulting pH change in a solution.

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The chemist has 642.4 millimoles of barium acetate in the solution.

To calculate the millimoles of barium acetate (Ba(C₂H₃O₂)₂) in the solution, we can use the formula:

moles = molarity × volume (in liters)

First, let's convert the volume from milliliters (mL) to liters (L):

440.0 mL ÷ 1000 = 0.440 L

Now we can substitute the given values into the formula:

moles = 1.46 M × 0.440 L

moles = 0.6424 mol (rounded to 4 decimal places)

To convert the moles to millimoles, we multiply by 1000:

millimoles = 0.6424 mol × 1000

millimoles = 642.4 mmol (rounded to 3 significant digits)

Therefore, the chemist has 642.4 millimoles of barium acetate in the solution.

It's important to note that the molarity (M) represents the number of moles of solute per liter of solution. By multiplying the molarity by the volume in liters, we can find the number of moles of solute. To convert moles to millimoles, we multiply by 1000. The result represents the millimoles of barium acetate present in the given volume of solution.

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Answer:

d. NH4+ and C2H3O2- ions

Explanation:

When ammonium acetate (NH4C2H3O2) is mixed with water, it dissociates into its ions. In this case, it dissociates into NH4+ (ammonium ion) and C2H3O2- (acetate ion). Therefore, the solution will contain NH4+ and C2H3O2- ions dissolved in water.

The solution contains NH4+ and C2H302 ions. Among the given options, the correct answer is option d. It forms a solution containing NH4+ and C2H302 ions that are fully dissolved in the water.

When a chemist mixes ammonium acetate into 500 mL of water, the ammonium acetate (NH4C2H3O2) dissolves and dissociates into its constituent ions. This results in the formation of NH4+ ions (ammonium ions) and C2H3O2- ions (acetate ions) in the solution. Ammonium acetate is a salt that readily dissolves in water, dissociating into NH4+ and C2H302 ions. The aqueous solution will contain NH4+ ions and C2H3O2- ions, which are formed due to the dissociation of ammonium acetate in water. These ions will be dispersed throughout the solution and will not sink to the bottom.

In conclusion, when ammonium acetate is mixed into water, it forms a solution containing NH4+ and C2H302 ions that are fully dissolved in the water.

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Answer:

among us

Explanation:

red among us

tama

For the n = 5 level of hydrogen, there are five possible subshells. The subshells are labeled using letters: s, p, d, f, and so on.

The number of possible subshells for a given energy level can be determined using the formula 2n², where n represents the principal quantum number.

In this case, since n = 5, we can substitute it into the formula to find the result. Applying the formula, we have 2(5)² = 2(25) = 50. Thus, there are 50 possible orbitals or subshells within the n = 5 level.

However, it's important to note that hydrogen has only one electron, so it can occupy only one orbital at a time. Therefore, while there are 50 possible subshells in theory, only one electron will occupy the n = 5 level of hydrogen.

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Answer:

Because it's a system in the solar areas.

Explanation:

Im just tryna sound smart, I actually have no clue

Answer:

The Latin word for the Sun is Sol, so we call this system the Solar System. He showed that it was very likely that all the planets moved around the Sun. This time even more people thought Galileo may be right and that the Earth really did move around the Sun.

Explanation:

There are many planetary systems like ours in the universe, with planets orbiting a host star. Our planetary system is named the "solar" system because our Sun is named Sol, after the Latin word for Sun, "solis," and anything related to the Sun we call solar.

Hope That Helps :0

As the names suggest, a physical change affects a substance's physical properties, and a chemical change affects its chemical properties. Many physical changes are reversible (such as heating and cooling), whereas chemical changes are often irreversible or only reversible with an additional chemical change.

(hope this helps ^^)

The compound that does not undergo Friedel-Crafts reaction is C. Nitrobenzene. Friedel-Crafts reaction involves the electrophilic substitution of an aromatic ring with an electrophile, typically a carbocation.

However, nitrobenzene contains a strong electron-withdrawing nitro group (-NO2), which makes the ring less reactive towards electrophilic attack. This is due to the fact that the nitro group withdraws electron density from the ring, making it less nucleophilic.

As a result, nitrobenzene does not react with electrophiles under typical Friedel-Crafts reaction conditions. In contrast, benzene, toluene, and naphthalene are all highly reactive towards electrophiles and readily undergo Friedel-Crafts reactions to form new substituted aromatic compounds.

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Answer:

Solids, Gasses, Liquids

Explanation:

Solids are rigid structures that have a definite share and volume.

Gasses will continue to spread indefinitely until pressure prevents further spreading.

Liquids have a volume but take the shape of the container they are in.  

For extraction, there should be an option c) lower solute solubility in the second phase.

Extraction is a process in which a solute is separated from a solution or mixture by two immiscible liquid phases. It involves two phases in which the solute has different solubilities.

In the first phase, the solute has higher solubility, meaning it dissolves more readily.

In the second phase, the solute has lower solubility, meaning it is less likely to dissolve.

In order for extraction to be successful, the solute must be differently soluble in the phases. This ensures that the solute is separated efficiently and effectively.


The process of extraction involves the formation of two liquid phases and the transfer of the solute from one phase to the other. The solute is transferred from the first phase to the second phase, where it is separated from the solution.


To summarize, extraction is a process of separating a solute from a solution or mixture by two immiscible liquid phases. It involves two phases in which the solute has different solubilities.

Therefore, for extraction, it is necessary for the solute to have a lower solubility in the second phase. and hence the correct answer is option c.

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First of all, Z is unknown. I hope it is a mistake.

        Now, it is given that the element X has nineteen electrons. This proves that X is actually Potassium.

        As per the periodic table, both Potassium and Lithium belongs to group 1 as their valency is 1 because of the presence of only one electron in the outermost shell of electrons i.e., they lose an electron during a chemical reaction to form a stable compound. Furthermore, both are metallic.

        Magnesium belongs to group 2 and hence its valency is two, which is different from potassium though it is metallic. Similiarly, bromine belongs to group 17 and gains one electron during a reaction in contrast to potassium.

( No internal links available for reference. For clarification, check the periodic table).

For the burning of sugar, there is a molar internal energy change. For a comb calorimeter, w=0 because Delta V=0 and Delta E=q+w. So Delta

E = q.

Water may absorb a lot of heat energy because of its large specific heat capacity without boiling or even significantly changing its temperature. Water is a useful medium for heat exchange in calorimetry because of this.

Heat transfer rates to or from a substance are measured using calorimetry. Heat is transferred to do this using a calibrated item (calorimeter). Calculating the quantity of heat transmitted by the process under study requires using the temperature change recorded by the calorimeter.

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Answer:

Option C

Explanation:

In Lewis dot structure the valence electrons are represented as dots around the symbol.

For example,

In hydrogen valence electron is only one it can be represented as,

H·

We know that in covalent bonding atoms share their electron to complete the octet. Thus, their Lewis dot structure would be represented as,

H:H

This is the Lewis dot structure of H₂.

In given atom X their are  2 valence electrons (3s²) thus its Lewis dot structure contain two dots around the symbol.

Option C is correct answer because it has only two dots which actually represent valence electrons.

Other options are incorrect because symbol X has more than two electrons/dots.

An Erlenmeyer flask is also termed as conical flask and titration flask. Invented in the year 1860. It is made up of glass and plastic. Inventer - Emil Erlenmeyer

Weight of empty erlenmeyel flask = 79.83 g

Weight after addition of water = 89.82 g

Weight of water = 89.82 - 79.83 = 9.99 g

Density of water at 22 deg celcius = 0.99777

Density = mass / volume

Volume = mass / density

= 9.99 g / 0.99777 g/ ml

= 10.01 ml

Calculated volume of water that the student measured is 10.01 ml.

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Answer:

C. Lower Electronegativity

Periodic table is divided into metals, non metals, semiconductors and noble gases on the basis of electron gain or loss. Metals have lower electronegativity. The correct options is option C.

Metals are those elements which is hard, conduct electricity, ductile, lustrous and malleable.

Lets take properties

1.Since metals have free electrons that's why they can conduct electricity.

2. Since atoms in metals are very closely packed in a definite crystal so these are solid. Metals are not brittle that is, it can not be broken down easily

3.Metals  do not react with water easily.

4.Metals are denser than water hence sink in water.

5. Metals are meant to give electrons so these have low ionization energy. and lower electronegativity.

6. Metals form basic form of oxide.

7. Metals have lower electron shielding.

Therefore the correct options is option C.

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A solution with a pH of 13.8 means that the solution is a strong base.

pH refers to power of hydrogen. The pH is a scale used to measure the degree of acidity or alkalinity of a solution.

pH scale ranges from 0 - 14

Where;

However, the closer the pH value is to 1, the more the acidity and vice versa while the closer it is to 14, the more the alkalinity and vice versa.

Therefore, a solution with a pH of 13.8 means that the solution is a strong base.

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Answer:

See explanation

Explanation:

Limonene is an oil from oranges and lemons. Its structure has been shown in the image attached to this answer.

There are two different groups of carbon atoms in limonene. One group of carbon atoms are sp2 hybridized while the other group are sp3 hybridized. The group of carbon atoms that are sp2 hybridized have a trigonal planar geometry and have been accurately labeled in the image attached while the carbon atoms that are sp3 hybridized were also labelled and have a tetrahedral geometry.

Hence in limonene, there are trigonal planar and tetrahedral carbon atoms.

One mole of a substance is defined as the amount of that substance that contains the same number of particles as there are atoms in exactly 12 grams of carbon-12. Approximately 550 mL of the 0.3000 M NaCl solution is required to produce 0.1650 moles of NaCl.

In chemistry, a mole (mol) is a unit of measurement used to quantify the amount of a substance. It is a fundamental concept in stoichiometry and plays a central role in understanding the relationships between the masses, numbers of particles, and volumes of substances involved in chemical reactions.

To determine the volume of a 0.3000 M NaCl solution needed to produce 0.1650 moles of NaCl, we can use the equation:

moles = molarity x volume

Rearranging the equation to solve for volume:

volume = moles/molarity

Given that the moles of NaCl is 0.1650 and the molarity is 0.3000 M, we can substitute these values into the equation:

\(volume = 0.1650 moles / 0.3000 M\\ = 0.55 L\)

To convert the volume from liters to milliliters, we multiply by 1000:

\(volume = 0.55 L * 1000 mL/L\\volume = 550 mL\)

Therefore, approximately 550 mL of the 0.3000 M NaCl solution is required to produce 0.1650 moles of NaCl.

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