The dotted arrow in this reaction is a placeholder. Select the arrow that best describes the relationship between the reactants and products. -CECAH -CEC-L Identify the correct arrow descriptor.

Group 7 of the periodic table, usually referred to as the halogen group, exhibits a number of tendencies. Among these trends are:

Increasing atomic radius: The atomic radius of the elements rises as you descend the group. This is so because every element increases the size of the atom by adding a new electron shell.

Increasing electron affinity: As you proceed down the group, the electron affinities of the elements in group 7 likewise rise. The energy released when an atom picks up an electron to create a negative ion is known as electron affinity. The group 7 elements have a high electron affinity due to their high reactivity and propensity to gain electrons quickly.

Melting and boiling points dropping: As you travel down the group, the melting and boiling points of the elements in group 7 tend to do the same. Because of their greater size and the weaker forces that bind them, atoms are kept together less tightly.

Increasing reactivity: Fluorine is the most reactive element in the periodic table, and group 7 elements are all quite reactive. The responsiveness of the elements often reduces as you progress along the group. All of the elements in group 7 are still quite reactive, and they frequently combine with other elements to produce compounds.

Increasing atomic radius, increasing electron affinity, lowering melting and boiling temperatures, and raising reactivity are the main trends in group 7 of the periodic table. These patterns are brought on by the distinct characteristics of the elements in this group, which are governed by the quantity and configuration of electrons in their outer shells.

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200 ml of water would be sufficient to dissolve 1.166g of milk of magnesia, mg(oh)2 (s) (58.3 g/mol).

It is a laxative (of the osmotic variety), and its mechanism of action is assumed to include pulling water into the intestines, which aids in causing bowel movement. The symptoms of having too much stomach acid, such as heartburn, an upset stomach, or indigestion, are also treated with this medicine.

MgCl2 +2NaOH→Mg(OH)2+2NaCl

moles of mg(oh)2 in 200ml of 58.3 M solution =  58.3 ∗200/10000.

​=1.166g

according to above equation, for 1 mole of MgCl2

we require 1 mole of NaOH

so, NaOH is a limiting reagent.

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The equation in which the enthalpy of formation is the same as the enthalpy of reaction is option A.

The term enthalpy has to do with the heat that is giving out or is absorbed in a reaction. We know that the enthalpy of formation would refer strictly to the heat that is given out or absorbed when a substances is formed from its constituents under standard conditions.

We know that when we are looking at the enthalpy of formation of a substance, we are looking at the way that the elements that make up the substance are able to combine and these elements that are becoming combined in the substance would have to do that under standard conditions so as to generate the equation of the enthalpy of formation of the substance.

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The abbreviated electron configuration for Al2+ is [Ne]3s2 3p1

since Al has 13 electrons :  [Ne]3s2 3p1

Al2+ means it has lost 2 electrons to become :  [Ne]3s1

Electronic configurations in chemistry can be describe as the way each electron move independently in an orbital, in an average field created by all other orbitals. which also means  the arrangement of electrons in orbitals around an atomic nucleus.

An electron in simple term is a negatively charged subatomic particle that binds together with protons and neutrons  to form an atom's nucleus. it can also be seen as a tiny particle of matter that is smaller than an atom and has a negative electrical charge in it.

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Directly inversely correlated are the following quantities: pressure and absolute temperature, volume and moles, volume and absolute temperature, and density and molar mass. Volume and pressure are inversely correlated.

A substance's molar mass is defined as its molecular weight in grams. By adding the molar masses of a substance's constituent atoms, as demonstrated in this video, we may get the substance's molar mass. Then, to convert between mass and the quantity of moles of the material, we may utilize the computed molar mass.

The sum of all the atoms' individual masses in grams that make up a mole of a certain molecule is known as the molar mass, sometimes referred to as molecular weight.

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The final volume will be larger than 1.12L.

What is ideal gas equation?

The Ideal Gas Law is an equation of state for a gas and is also known as the equation of state of an ideal gas. It states that the product of the pressure, volume, and temperature of an ideal gas is a constant. Mathematically, the Ideal Gas Law can be written as PV = nRT, where P is pressure, V is volume, n is the number of moles of the gas, R is the ideal gas constant, and T is temperature. The constant R is equal to the gas constant, 8.314 J/mol-K, divided by the molar mass of the gas. The Ideal Gas Law is an approximation of the behavior of many gases under many different conditions. It is useful because it relates the variables of pressure, volume, and temperature in a simple mathematical relationship.

PV=nRT

Using ideal gas equation

V2= P1V1/T1 ×T2/P2

In this equation P2 is in denominator so when pressure is decreased V2 increases.

T2 is in numerator so when temperature increases V2 increases.
Overall V2 increases.

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The final gas volume will increase

Define the ideal gas law.

The ideal gas law, also known as the perfect gas law, is a relationship between a gas's pressure P, volume V, and temperature T in the range of low pressures and high temperatures where the gas's molecules move virtually independently of one another.

The ideal gas law (PV = nRT) connects the macroscopic characteristics of ideal gases. An ideal gas is one in which the particles are both non-repellent and non-attractive to one another (have no volume).

PV = nRT

P1V1/T1 = P2V2/T2

From tis .pressure is directly proportional to volume

So if pressure is decreased, volume also decreases

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Answer:

0.164 M

Explanation:

Molarity is defined as moles of solute per liter of solution.  In order to arrive at the desired units, dimensional analysis must be performed.

To find moles of sodium:

[tex]890\ mg\ Na(\frac{1\ g}{1000\ mg})(\frac{1\ mol\ Na}{22.99\ g\ Na})=0.0387\ mol\ Na[/tex]

To find liters of solution:

[tex]1\ cup(\frac{1\ qt}{4\ cups})(\frac{0.946\ L}{1\ qt})=0.2365\ L[/tex]

The ratio of sodium to solution can then be written as [tex]\frac{0.0387\ mol}{0.2365\ L}[/tex].  This can be simplified by dividing the numbers, [tex]0.164\frac{mol}{L}[/tex] or 0.164 M.

The change in the internal energy of a gaseous system that absorbs 21 J of heat and does 8.0 J of work by expanding is 13 J

Energy can only be transformed; it cannot be created or destroyed, according to the First Law of Thermodynamics. For any system, energy transfer examples include mass crossing the control border, external work, or heat transfer over the barrier. The vigor and vitality required for ongoing physical or mental activity is referred to as energy. Heat is the transfer of kinetic energy between two substances, or from an energy source to a material or object. Any action that needs both mental and physical effort to achieve a goal or result is considered work.

ΔE˭q˖w

q= heat added or lost from system

w= work done by system or on system

q is negative when heat is lost

w is negative when a system affects its environment

here, q˭21 and w˭8

ΔE˭21˖(˗8)

ΔE˭13 J

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The energy of the wave can be obtained as 6.6 * 10^-16 J.

We know that the energy of a wave has to do with the energy that is possessed by the wave and we can be able to obtain this energy by the means of the equation of Max Plank.

We know that we have the following equation;

E = hf

h = Plank's constant

f = Frequency of the wave

Then we have;

E = 6.6 * 10^-34 Js * 1 * 10^18 Hz

E = 6.6 * 10^-16 J

The radio waves have an energy of about 6.6 * 10^-16 J.

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Scientific theories explain why a phenomenon occurs and a scientific law explains what occurs. The correct option is A.

A scientific theory is an explanation for a phenomenon in the natural world or the universe that has undergone extensive testing and verification using approved procedures for observation, measurement, and result evaluation.

A scientific law often describes an observed phenomenon. It doesn't explain the phenomenon's existence or its origins.

A scientific theory is the explanation for a phenomenon. It is a myth that with enough study, theories can become laws.

Thus, the correct option is A.

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The molecule or ion that is being oxidized in the reaction is TeO2. Ceramics may occasionally be colored using tellurium dioxide.

TeO2 is soluble in strong acids, alkali metal hydroxides, and only very little water. Due to its amphoteric nature, it can operate as either an acid or a base depending on the solution it is in. It interacts with bases to form tellurites and acids to create tellurium salts.

Due to the presence of 6 e-pairs surrounding the center atom, 6 atoms bound to it, and 0 lone pairs, this molecule is octahedral.

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The complete question is:

A sample of ore containing the mineral tellurite, TeO2 , was dissolved in acid. The resulting solution was then

reacted with a solution of K2Cr2O7 to form telluric acid, H2TeO4 . The unbalanced chemical equation for the

reaction is given below.

. . . TeO2(s) + . . . Cr2O72−(aq) + . . . H+(aq) → . . . H2TeO4(aq) + . . . Cr3+(aq) + . . . H2O(l)

(a) Identify the molecule or ion that is being oxidized in the reaction.

The answer is O II only.

I: Calculation errors would be considered a valid source of error in a laboratory experiment. If the calculations made during the experiment are incorrect, it can affect the accuracy of the results.

II: Inability to calibrate measuring devices would NOT be considered a valid source of error in a laboratory experiment. Calibrating measuring devices is an essential step in any experiment to ensure that the measurements being taken are accurate. If the measuring devices are not calibrated correctly, the results of the experiment will be invalid.

III: Using the wrong solution for a reaction would be considered a valid source of error in a laboratory experiment. If the wrong solution is used, the results of the experiment may not be accurate.

Therefore, II is the only option that would NOT be considered a valid source of error in a laboratory experiment.

The answer is O II only.

I: Calculation errors would be considered a valid source of error in a laboratory experiment. If the calculations made during the experiment are incorrect, it can affect the accuracy of the results.

II: Inability to calibrate measuring devices would NOT be considered a valid source of error in a laboratory experiment. Calibrating measuring devices is an essential step in any experiment to ensure that the measurements being taken are accurate. If the measuring devices are not calibrated correctly, the results of the experiment will be invalid.

III: Using the wrong solution for a reaction would be considered a valid source of error in a laboratory experiment. If the wrong solution is used, the results of the experiment may not be accurate.

Therefore, II is the only option that would NOT be considered a valid source of error in a laboratory experiment.

Substances in which atoms are  held together by polar covalent bonding is b)CsCl.So,correct option is b.

Polar covalent bond is a kind of compound bond where one sets of electrons is shared unevenly between two molecules. For instance, Hydrogen chloride (HCl) particle. The holding of hydrogen and chlorine iotas inclines more towards Cl particles since Cl is more electronegative in nature than hydrogen

Since Cs has one unpair of electron and Cl has five unpair electron. So, both of elements are favorable for formation of covalent bond.

Properties of Polar Covalent Compound

Hence,correct option is B.

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A stronger bond is always created when the bond's enthalpy is higher since a stronger bond requires more energy to break.

Bonds are financial instruments in which a buyer loans money for a certain duration to a business or the government in return for periodical interest payments.

Between atoms or ions, a condensation reaction is a source of attraction. Atoms share or transmit their valence electrons, which results in bonds. The electrons that can be engaged in chemical reactions are known as valence electrons, which are located at the outermost energy level of the atom.

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In joules, electrical energy could be quantified.Volts are used to measure electrical potential.

When referring to this attribute in relation to electrical applications, it is more frequently referred to as voltage. Voltage is a measurement of the energy that accompanies the transfer of charge.The unit of measurement for potentials is the volt (V), which is equal to one joule in energy for every coulomb of charge.

The potential differential between both the two electrodes of an electrochemical cell, which develops when electrons are transmitted through the open circuit of the a cell that has not yet reached equilibrium, is known as the cell potential.

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The closest packed formations always have six atoms in a plane surrounding each atom.

74% of the available space is effectively filled by the configuration in a cubic closest packing. The second layer of spheres is stacked on top of half of the first layer's depressions, much like in hexagonal closest packing.

Placing spheres in Cartesian space with their centers at integer coordinates is known as simple cubic packing. Face-centered cubic packing is achieved by layering closely packed spheres such that every third layer's spheres overlap one another.

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In studying the influence of environmental pH on peroxidase activity, researchers can repeat the experiment without guaiacol, which will reveal the effect of guaiacol on reaction rates.

One of the investigators' proposal to use oxygen gas production to measure reaction rates leads to a change in the dependent variable.

In the first experiment the dependent variable was the volume of guaiacol and in the second experiment the dependent variable will be oxygen production.

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Answer:

Explanation:

The most common way to solve this problem is to use the formula

c

1

V

1

=

c

2

V

2

In your problem,

c

1

= 4.2 mol/L;

V

1

= 45.0 mL

c

2

= ?;

V

2

= 250 mL

c

2

=

c

1

×

V

1

V

2

= 4.2 mol/L ×

45.0

mL

250

mL

= 0.76 mol/L

The concentration terms are molality, normality and mole fraction. Molarity can be used to find out the ionic strength of any solution. Therefore, 0.050moles of sodium hypobromite (NaBrO) should be added to 1.00 L of 0.050 M hypobromous acid (HBrO) to form a buffer solution of pH 9.15

Molarity can be calculated by dividing number of moles of solute by volume of solution in litre. Molarity is affected by temperature. Its unit is mole/liter. It measure the concentration of any solute in a solution.

Mathematically,

Molarity= number of moles of solute/volume of solution in litre

Where,

moles= ?

volume= 1.00 L

Molarity=0.050 M

Substituting values in equation, we get

0.050=number of moles of solute/1.00

number of moles of solute=0.050moles

Therefore, 0.050moles  of sodium hypobromite (NaBrO) should be added to 1.00 L of 0.050 M hypobromous acid (HBrO) to form a buffer solution of pH 9.15

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The food coloring would spread across all the papers at the end of the 30 minutes.

We know that diffusion does occur in all the states of matter whether solid, liquid or gas. We know the speed of the diffusion would depend on the particular kind of matter that is in question as we can see.

From the question, we have a food coloring which is liquid. The food coloring would eventually diffuse across the boundaries and get to all the papers that have been laid out as shown.

Hence, the food coloring can be said to spread by the principle of diffusion.

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The given question is incomplete, hence, can not be answered. Still, adding some relevant information for your reference.

What are formal charges?

Formal charge (FC) is the charge associated with the atoms in a molecule, assuming that the electrons of all chemical bonds are shared equally between atoms, regardless of their relative electronegativities. In determining the optimal Lewis structure (or dominant resonance structure) of a molecule, structures are chosen such that the formal charge of each atom is as close to zero as possible.

In chemistry, the formal charge in the covalent view of a chemical bond is assigned to the atoms in a molecule assuming that all chemical bond electrons are equally shared between atoms, regardless of their relative electronegativities. is the virtual charge that Simply put, the formal charge is the difference between the number of valence electrons of an atom in the neutral free state and the number assigned to that atom in the Lewis structure. In determining the optimal Lewis structure (or dominant resonance structure) of a molecule, structures are chosen such that the formal charge of each atom is as close to zero as possible.

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Nitrous acid, phosphoric acid, sulfurous acid and carbonic acid are the  weak acids. Hydrochloric acid and perchloric acid is a strong acid. This can be Written in the aqueous solution.

Nitrous acid is a weak acid and can be written in the aqueous solution as,

HNO2 (aq.) ----> H+ (aq.) + NO2- (aq.)

This is very unstable and exists only in aqueous solution.

Hydrochloric acid is a strong acid and can be written in the aqueous solution as,

HCl(aq.) ------> H+ (aq.) + Cl -(aq.)

perchloric acid  is a strong acid and can be written as

HClO4 (aq.) ---->   H+ (aq.) + ClO4- (aq.)

Phosphoric acid is a weak acid. It is a triprotic acid that exists as a dense liquid. It is an irritant or corrosive to the skin, eyes. It can be written in the aqueous solution as,

H3PO4 (aq.) ----> H+ (aq.) + H2PO4- (aq.)

sulfurous acid is a weak acid and can be written as,

H2SO3 (aq.) ----> H+ (aq.) + HSO3- (aq.)

carbonic acid is a weak acid. Carbonic acid is a carbon-containing compound which has the chemical formula H2CO3. This can be written in the aqueous solution as,

H2CO3 (aq.)  ----> H+ (aq.) + HCO3- (aq.)

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In the following reactions, NADH is converted to NAD+, FMN to FMNH2, Fe+2 to Fe+3, and CoQ to CoQH2.

When an electron is taken away from a molecule throughout a chemical reaction, the process is known as oxidation. What occurs during oxidation? There is an electron transfer during oxidation. In other words, there is an electron loss during oxidation.

The removal of electrons from the a material causes oxidation. Additionally, it is when a material gains oxygen. When magnesium combines with oxygen to generate magnesium oxide, for instance, it is oxidized: The compound magnesium oxide is created when magnesium and oxygen are combined.

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Matter are anything that is made up of atoms. The quantity of matter can be observed only on the basis of mass and volume calculation. Thus option C is correct option.

Matter is a substance that has some mass and can occupy some volume. The matter is mainly used in science. Matter can be solid, liquid or gas.

Matter is anything that is made up of atoms. Anything around us that can be physically seen and touched are matter. Ice, water and water vapors are example of matter.

Giant planet atmospheres have layers of clouds and aerosols (tiny liquid droplets) made from different chemicals because different chemicals condense at different temperatures.

Therefore,  option C is correct option.

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Considering the Gay-Lussac's law, the final temperature when the gas is heated at constant volume until the pressure triples is 909 K or 636° C.

Gay-Lussac's law establishes the relationship between the temperature and pressure of a gas when the volume is constant. This law says that the pressure of a gas is directly proportional to its temperature: if the temperature increases, the pressure will increase, while if the temperature decreases, the pressure will decrease.

Mathematically, Gay-Lussac's law states that the ratio between pressure and temperature always had the same value:

P÷ T= k

where

Analyzing an initial state 1 and a final state 2, it is fulfilled:

P₁÷ T₁= P₂÷ T₂

In this case, you know that the gas is heated at constant volume until the pressure triples. This is, P₂=3×P₁

Replacing in Gay-Lussac's law:

P₁÷ T₁= (3×P₁)÷ T₂

T₂× (P₁÷ T₁)=(3×P₁)

T₂= (3×P₁)÷ (P₁÷ T₁)

T₂= 3×T₁

If one mole of oxygen gas is at a temperature of 30°C of 303 K (being 0 C= 273 K), then:

T₂= 3×303 K

T₂= 909 K = 636° C

Finally, the final temperature is 909 K or 636° C.

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A gas is collected over water at a certain temperature, then the partial pressure of gas is calculated to be = 741 torr

The term "water vapor pressure" refers to the amount of water vapor present in any gas combination that is in equilibrium with either solid or liquid water. When the vapor pressure equals the atmospheric pressure, water begins to boil.

Given total pressure is 760 torr

Vapor pressure of water = 17 torr

As we know that, partial pressure of gas = total pressure - vapor pressure of water

= 760 - 17

Partial pressure of gas = 741 torr.

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The atomic number of an atom is the number of protons in the nucleus of the atom, while the mass number is the total number of protons and neutrons in the nucleus. The atomic number is unique to each element and determines the identity of the element, while the mass number is a measure of the mass of the atom and can vary within an element.

Atoms are electrically neutral when the number of protons in the nucleus is equal to the number of electrons orbiting the nucleus. This means that the positive charge of the protons is balanced by the negative charge of the electrons, resulting in an overall neutral charge for the atom.

The atomic number of each atom represents the number of protons in the nucleus of the atom. This number is unique to each element and determines the identity of the element. For example, the atomic number of hydrogen is 1, which means that it has one proton in its nucleus and is therefore a unique element. The atomic number is used to arrange the elements in the periodic table and is an important property of atoms.

Answer:

A

Explanation:

Based on a ruler in centimeters, with ten divisions between each centimer mark, you will have marks at every 0.1 cm.

Then, the measure of the length of a metal rod should have 1 decimal place.

That decimal place means limiters, given that 1 mm = 0.1 cm.

Answer:

A

Explanation:

Based on a ruler in centimeters, with ten divisions between each centimer mark, you will have marks at every 0.1 cm.

Then, the measure of the length of a metal rod should have 1 decimal place.

That decimal place means limiters, given that 1 mm = 0.1 cm.

Answer:

3.51 x 10²¹ molecules H₂O

Explanation:

To find the amount of molecules in the sample, you need to multiply the amount of moles by Avogadro's Number. Avogadro's Number is a ratio comparing the amount of molecules per every 1 mole. It is important to arrange the ratio in a way that allows for the cancellation of units (moles should be in the denominator). The final answer should have 3 sig figs like the given value (0.00583 = 3 sig figs).

Avogadro's Number:

6.022 x 10²³ molecules = 1 mole

0.00583 moles H₂O           6.022 x 10²³ molecules
--------------------------------  x  --------------------------------------  =  3.51 x 10²¹ molecules
                                                          1 mole