what does the lewis dot structure of mg2 look like? group of answer choices zero pair of electrons one pair of electrons one pair of electrons, two lone electrons four pairs of electrons

KClO₂, NaC₂H₃O₂, LiBrO, and LiCN will form basic solutions.

How is a basic solution formed?

A basic solution can be created easily. A solid base is dissolved in water to create a basic solution. Water reacts with some solid bases as a result, producing hydroxide ions. For instance, when water (H2O) is exposed to NaOH, the reaction results in Na+ and OH-.

LiBrO in an aqueous solution is basic. This conjugate base creates hydroxide ions when it is in equilibrium with the water.

Salt that is basic is NaC₂H₃O₂. Salts produced by the interaction of a strong base and a weak acid are typically basic. The solution will be basic.

The potassium ion in KClO₂ does not hydrolyze in water. Due to the ionization of ClO−2 C l O 2 − hydroxide ions are formed. This results in a solution with a basic pH value. Similarly, LiCN is also basic in water.

Hence, the answer is all of the above.
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ΔU of the reaction the combustion of compound x is -538 kJ/mol

Combustion is a reaction in which a substance reacts with oxygen gas and releasing energy in the form of light and heat

Here given data is

Mass of compound x = 0.485gram

Mass of water = 3000gram

Temprature rise =  0. 285°C

Heat capacity of the calorimeter = 3. 81 kJ/°C

Specific heat of water =  4. 184 J/g·°C

MW of x = 56. 0 g/mol

Then calculate q

ΔU = ΔH -PΔV

The bomb calorimeter has a constant volume ΔV = 0

ΔU = ΔH

q reaction = q(water + q(bomb)

q(bomb) = 3810J/°C×0.285 = 1085.85J

q(water) = 3000g × 4. 184 J/g·°C×0.285°C = 3577.32 J

q reaction = q(water) + q(bomb)

q reaction = 4663.17 J = 4.66kJ means this is an exothermic

Then calculate moles of compound

Moles = mass/molar mass

Moles = 0.485 g/56.0g/mol

Moles = 0.00866 moles

Then calculate ΔU

ΔU = 4663.17 J/0.00866 moles = 538472 j/mol = 538.5kJ/mol means the reaction is exothermic

ΔU = -538kJ/mol

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The first compound to accumulate is 1,3-bisphosphoglycerate.

Carboxylation is step one within the Calvin cycle where carbon dioxide is bonded to a five-carbon sugar called RuPB. though it is known as the darkish response the Calvin cycle does not surely occur within the darkish or all through the nighttime time. that is because the procedure requires NADPH, which is short-lived and is derived from light-structured reactions.

The reactions of the Calvin cycle add carbon to an easy 5-carbon molecule referred to as RuBP. these reactions use chemical energy from NADPH and ATP that have been produced in the light reactions. The very last manufactured from the Calvin cycle is glucose. The Calvin cycle reactions may be organized into 3 simple degrees fixation discount and regeneration.

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In order to use a flashlight to see in the dark, the flashlight must first transform the electrical energy it receives from batteries into light energy.

What is flashlight?
A portable hand-held electric lamp is known as a torch (UK, Australia), or a flashlight (US, Canada). The light source used to typically be a tiny incandescent light bulb, but since the mid-2000s, light-emitting diodes (LEDs) have taken their place. A typical flashlight is made up of a light source mounted inside a reflector, a transparent cover to shield the light source as well as reflector, a battery, a switch, and sometimes a lens. All of these components are housed in a case. Around 1899, the development of dry cells and tiny incandescent electric lamps made the first battery-operated flashlights feasible. Today's flashlights run on disposable as well as rechargeable batteries and mostly use light-emitting diodes. Some require the user to turn a crank, shake the lamp, or squeeze it in order to operate. Some batteries can be recharged using solar panels.

In order to use a flashlight to see in the dark, the flashlight must first transform the electrical energy it receives from batteries into light energy. This light energy is then emitted from the flashlight in a concentrated beam, which illuminates the area in front of the person using the flashlight and allows them to see in the dark.

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Substances with weak intermolecular forces will have higher vapor pressure

Vapor pressure is the measure of the tendency of a material to change into the gaseous or vapor state, and it increases with temperature. So, the temperature at which the vapor pressure at the surface of a liquid becomes equal to the pressure exerted by the surroundings is called the boiling point of the liquid. Or we can simply say that the when a liquid is boiling its vapor pressure is equal to the external pressure.

In the above given case we are comparing the intermolecular forces and understanding the concept of vapor pressure. So, vapor pressure of liquid is said to be  inversely proportional to the intermolecular forces between the atoms of the liquid. This relation means that if the liquid has stronger intermolecular forces than the rate of evaporation of liquid will be very low and hence it causes lower vapor pressure.

But whereas if the  intermolecular forces are weaker then the rate of evaporation of the liquid will be high and therefore it vaporizes fast which results in higher vapor pressure.

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The mass of the products when 5g of a chemical A is combined with 5g of chemical B is 10g.

The law of conservation of mass is a law of classical physics that states that the total mass of a closed system remains constant regardless of the chemical or physical changes that take place within it.

The law explains that a mass in an isolated system can neither be created nor be destroyed but can be transformed from one form to another”.

This means that in a chemical reaction, the mass of the reactants must be equal to the mass of the products.

According to this question, chemical A has a mass of 5 grams and chemical B has a mass of 10 grams. If these two chemicals are mixed and a complete chemical reaction occurs, the total mass of the products in accordance with the law of conservation of mass is 5g + 5g = 10 grams.

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Answer:

Bromine has 7 electrons but to complete the octet you add one more electron so it has a net charge of 1-

Explanation:

The heat capacity of calorimeter is 133.76 J/c.

What is calorimeter?

A calorimeter is a device used in calorimetry, a procedure for calculating heat capacity and trying to measure the heat of chemical reactions or even other physical changes. Among the most popular kinds are dsc calorimeters, isothermal micro calorimeters, titrimetric calorimeters, and accelerated rate calorimeters. A straightforward calorimeter is just a metal container with a thermometer suspended beyond a combustion chamber. It's one of the measurement tools used in the research of chemistry, biochemistry, and thermodynamics. The two substances A and B are separately added to a calorimeter, and the original and final temperatures are recorded, in order to determine the enthalpy change per mole of substance A in a reaction between those two substances.

We know:

mw Cw Ow = mc Cc delOc + Ccal delc

80g * 4.18/gc * (80-45)C = 80g * 4.18J/g * (45-20) + Ccal *(45-20)

= 11704J = 8360 + Ccal (25)

= 133.76 j/c

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Answer: amorphous

Explanation:

Amorphous solids don't have an organized structure and therefore don't have a definite melting point. They slowly soften and melt as the temperature increases.

Trans isomer of  1-bromo-3-tert-butylcyclohexane reacts faster when refluxed with potassium tert-butoxide

Structural isomers are those isomers in which the atoms are completely arranged in a different order but they have the  same molecular formulas. These are the molecules having the same kind of molecular formula with different connectivity which is completely  depending upon the order they are put together.

Cis isomers are molecules with the same connectivity of atoms. They feature that the same side priority groups are placed on the same side of a double bond. Trans isomers feature molecules with same side priority groups placed on opposite sides of a double bond.

In the above given question the trans isomer of 1-bromo-3-tert-butylcyclohexane reacts faster when refluxed with potassium tert-butoxide, because in trans isomer there is less steric hindrance and therefore it can react easily, where as the cis isomer is having a lot of  steric hindrance

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The mass of zinc that the company can expect to produce is 5g.

The reaction is given as follows:

Ca + ZnCO₂ → Zn + CaCO₃

15g       25g      ? g        35g

To find: mass of zn

The above given reaction is an example of a displacement reaction.

According to law of conservation of mass, in a chemical reaction the mass of reactants is equal to the mass of products.

Here, mass of reactants

= mass of Ca + mass of ZnCO₂

= 15g + 25g

mass of products

= mass of Zn + mass of CaCO₃

=mass of Zn + 35g

∵ mass of reactants = mass of products

⇒ 15g + 25g= mass of Zn + 35g

⇒mass of Zn = (15+25)g - 35g

⇒mass of Zn = 40g- 35g

⇒mass of Zn = 5g

Hence, 5g of Zinc is expected to be produced.

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True each element possesses unique physical and chemical properties.

An element's properties are based on its atomic numbers, atomic masses, and electron configurations. An element is a pure substance consisting of only one type of atom which all have the same number of protons in their nuclei. A substance whose atoms all contain the same number of protons is said to be an element; alternatively, all the atoms of a particular element must contain the same number of protons. Chemical reactions cannot degrade elements because they are the simplest chemical forms. The two main classes of elements are metals and non-metals.

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The energy of combustion for 1 gm of the hydrocarbon is 0.56 kJ

What is a bomb calorimeter?

Bomb Calorimeter is a constant-volume  calorimeter which  measures the heat of a particular reaction or measures the calorific value of the fuels. They can withstand  large pressure produced within the calorimeter due to the reaction or burning of fuel.

The above question can be solved by

Energy of combustion = m X c X ΔT

m = mass of hydrocarbon burnt  ,

 c = heat capacity of calorimeter   ,

 ΔT = temperature change

Energy of combustion = 0.106g X 2.47kJ/K X 2.14K = 0.56kJ

Energy of combustion when 1g of hydrocarbon is burnt = (0.56kJ / 0.106g ) X 1g = 5.28kJ

Hence,  The energy of combustion for 1 gm of the hydrocarbon is 0.56 kJ

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For the student who is reacting magnesium and hydrochloric acid by placing a strip of Mg metal into a beaker containing HCl solution, the rate of reaction between the Mg and the HCl will be increased by:

The rate of a chemical reaction is the rate at which the reactant molecule is converted or the rate at which product molecules are formed.

Mathematically;

The factors that affect the rate of a reaction are:

In the given reaction, the surface area of the reactants can be increased by cutting the magnesium metal strips into smaller pieces thus, increasing the reaction rate.

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Answer:

It C smh smh

Explanation:

Usatest prep and expert explanation

It is very important to know how elements and compounds react together because everything that surrounds us is made out of elements and compounds. Therefore, understanding how these work can allow us to have a better understanding of the world that surrounds us. Moreover, it can avoid accidents when we deal with dangerous compounds, such as when we cook or clean.

Some elements are more "reactive" than other elements because the number of electrons in the outermost shell of the atom is greater that that of others.

A chemical element is a species of atoms that have a given number of protons in their nuclei, including the pure substance consisting only of that species.

The known elements have certain properties that helps in their identification .Those properties include  but are not limited to the following:

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Answer:

it is very important to know how elements and compounds react together because everything that surrounds us is made out of elements and compounds. Therefore, understanding how these work can allow us to have a better understanding of the world that surrounds us. Moreover, it can avoid accidents when we deal with dangerous compounds, such as when we cook or clean.

Explanation:

Answer:

Graph A.

Explanation:

Graph

It represents a constant function

Answer:

graph c

Explanation:

Answer:

James Hutton described the Law of Inclusions, which states that if one rock body (Rock B) contains fragments from another rock body (Rock A), then Rock B must be younger than the bits of rock it has.Garnets commonly contain many inclusions

2 valence electrons must m have .

What is neutralisation reaction ?

Neutralization is the process by which acids and bases salts and water. When reacting with water, neutralization leaves excess hydrogen or hydroxide ions in solution. The pH of a neutralized solution depends on the strength of the acid or base it contains. Mixing a strong acid and a strong base makes a neutral salt. Mixing a strong acid and a weak base produces an acid. Similarly, when a weak acid is mixed with a strong acid, the salts formed are basic. Neutralization is used in many applications.

For example, acid + base —-> salt + water i. e. NaOH (sodium hydroxide, base) + HCl (hydrochloric acid, acid) ——> NaCl (salt) + H2O (water)react to form

Reaction between metal oxide and H2O

Metal oxide + H2O --> M(OH)x

Reaction between metal oxide and HCl

M(OH)x + xH2O ---> MClx + xH2O

Volume = 29 mL

Molarity of HCl solution = 1.8 M

Moles of HCl = molarity * Volume

Moles of HCl = 1.8 M * 29 mL *10^-3 L/ 1 mL

Moles of HCl = 0.0522 mol

Volume = 73 mL

Molarity of M(OH)x = 0.35 M

Moles of M(OH)x = Volume * Concentration of M(OH)x

Moles of M(OH)x = 73 mL * 10^-3 L / 1mL *0.35 M

Moles of M(OH)2 = 0.02555 mol

x = moles of HCl / moles of M(OH)x

x = 0.0522 mol / 0.02555 mol

x = 2

Number of valance electron = x = 1

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Answer:

If you placed the two magnets so that opposite poles are facing each other, the force will be attractive and you will need to add more mass to the opposite side of the scale Magnetic attraction and repulsion is one of three fundamental non contact forces in nature

If there’s a attraction it comes towards one on other if there repulsion the opposite happens.

Explanation:

The mechanical advantage of the lever that has a 36 cm input arm and a 6 cm output arm is 0.167.

Mechanical advantage is the ratio of the output force produced by a machine (especially a simple machine) to the applied input force.

This means that mechanical advantage of a machine can be calculated by dividing the output force by the input force as follows:

MA = Fb/Fa

Where;

According to this question, a lever has a 36 cm input arm and a 6 cm output arm. The mechanical advantage can be calculated as follows;

MA = 6cm ÷ 36cm

MA = 0.167

Therefore, 0.167 is the mechanical advantage of the lever.

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Answer:

Paper chromatography requires less preparation, whereas thin layer chromatography requires more preparation time. The stationary phase of paper chromatography is the water trapped in the cellulose filter paper. The stationary phase of the thin layer chromatography is the glass plates coated with silica gel.

Explanation:

A scientific law is different from a scientific theory because it describes something in nature without attempting to explain it, this statement is true.

A scientific law foretells the outcomes of particular beginning circumstances. It may tell you what color hair your unborn kid would have or how far a baseball will go when fired at a specific angle.In contrast, a theory seeks to offer the best plausible justification for why events take place the way they do.

A scientific law often describes an observable phenomena. It doesn't explain the phenomenon's existence or its origins. A scientific theory is the explanation for a phenomena. It is untrue that with enough study, hypotheses become laws.

Thus, a scientific law is different from a scientific theory because it describes something in nature without attempting to explain it, this statement is true.

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To learn about the saturated solution and concentration to find the value of Ksp.

What is saturated solution?

When a solution has dissolved all of the solute it is capable of removing, it is said to be saturated. At a certain temperature, a saturated solution cannot dissolve any more solute. We can create a saturated solution by continuing to dissolve the solute until no more can be done.

What is concentration?

In chemistry and related fields, the idea of concentration is used frequently. It is a way to gauge how much of one substance is incorporated into another.

The ionic compound lead(II) chloride, or PbCl2, does not completely dissociate into lead(II) cations and chloride anions when placed in aqueous solution.

Instead of completely dissociating, a state of equilibrium will be established between the solid lead (II) chloride and the dissolved ions under the control of the solubility product constant, K sp.

PbCl 2(s) + 2 Cl (aq] Pb 2 + (aq]

The compound's molar solubility, or s in moles, represents the amount of lead(II) chloride that will dissolve in aqueous solution at a given temperature.

A mole of lead II chloride will result in the production of 1 mole of lead II cations and 2 moles of chloride anions. To determine the molar solubility of the solid, use an ICE table.

PbCl 2(s) + 2 Cl (aq] Pb 2 + (aq]

I      0        0

C     (+s)     (+2s)    

E      s          2s

According to the definition, the solubility product constant will equal

Ksp = (pb²⁺) (cl⁻)²

Ksp = s⋅ (2s)²= 4s³

As a result, lead (II) chloride will have a molar solubility of

4s³=1.6⋅10⁻⁵⇒ s= [tex]\sqrt[3]{1.6/4*10^-5}[/tex] = 0.0159 M.

Therefore, the value of ksp for pbcl2 at this temperature is 0.0159 M.

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Answer:

The first 20 Elements of the Periodic Table: Hydrogen, Helium, Lithium, Beryllium, Boron, Carbon, Nitrogen, Oxygen, Fluorine, Neon, Sodium, Magnesium, Aluminium, Silicon, Phosphorus, Sulphur, Chlorine, Argon, Potassium, Calcium.

Explanation:

hope this helps:)

The first 20 Elements of the Periodic Table are given below:

What is an element?

A chemical element is a type of atom with a particular number of protons in the nucleus, such as the specific compound made up entirely of that species. Chemical elements, unlike chemical compounds, cannot be broken down into simpler substances by any chemical reaction. The number of protons in the nucleus is an element's defining attribute, and it is symbolised by the symbol Z - all atoms with the same atomic number are atoms of the same element. Atoms are rearranged into new compounds linked together by chemical bonds when various elements undergo chemical reactions.

The first 20 Elements of the Periodic Table are given below:

Hydrogen (atomic number 1), Helium (atomic number 2), Lithium (atomic number 3), Beryllium (atomic number 4), Boron (atomic number 5), Carbon (atomic number 6), Nitrogen (atomic number 7), Oxygen (atomic number 8), Fluorine (atomic number 9), Neon (atomic number 10), Sodium (atomic number 11), Magnesium (atomic number 12), Aluminium (atomic number 13), Silicon (atomic number 14), Phosphorus (atomic number 15), Sulphur (atomic number 16), Chlorine (atomic number 17), Argon (atomic number 18), Potassium (atomic number 19), Calcium (atomic number 20).

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Using the ideal gas law, the moles of an ideal gas required are

Volume = 1.09 L

Pressure = 1.00 atm

Temperature (not given so we take the room temperature) = 25 °C or 298 K

Value of R = 0.0821 atm.L/mol.K

Number of moles = ?

Ideal gas law:

   PV = nRT

Rearrange it for the number of moles (n)

    n = PV / RT

Put the values

    number of moles (n) = 1.00 atm × 1.09 L ÷ 0.0821 atm.L/mol.K × 298 K

    number of moles (n) = 1.09 / 24.46 mol

    number of moles (n) = 0.0446 mol

So 0.0446 mol of an ideal gas is required to fill 1.09 L can.

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6.616% of sodium chloride is present in solution as a mass percent.

An example of an electrolyte is chloride. It functions with additional electrolytes like sodium, potassium, & carbon dioxide (CO2). These compounds support the maintenance of the body's hydrochloric balance and correct fluid balance.

One of the elements in your blood is chloride. Chloride blood tests determine whether you have healthy amounts of chlorine in your blood. Dehydration, vomiting, and other medical disorders are just a few of the many things that can lead to an abnormally high quantity of sodium in your blood.

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Answer:

Explanation:

The glass with Jell-O is a colloid, the glass with plain water is a pure substance, and the glass with sugar and red food coloring is a solution.

What I observed is that the light was scattered more in the glass with the Jell-O mixture and the glass with the sugar water. The light was not scattered in the glass with just plain water.

The Tyndall effect is the scattering of light by particles in a colloid or fine suspension.

The glass with the Jell-O mixture displayed the Tyndall effect. This tells me that the substance in the glass is a colloid.

The glass with just plain water represents a pure substance.

Therefore, the glass with the sugar water and food color represents a solution. The glass with the Jell-O mixture represents a colloid.

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Vapor pressure will increase with Temperature.

What does vapor pressure mean exactly?

The vapor pressure of a liquid is the pressure at which a vapor and its liquid (or solid) are at equilibrium, or the pressure at which a sample of a liquid (or solid) evaporates in a closed container to produce a vapor.

Vapor pressure for liquids is influenced by the following variables: Intermolecular Force and Temperature

The molecules of a liquid begin to move more quickly as the temperature rises. More vapor pressure is produced as a result of the production of gas. As a result, vapor pressure and temperature are directly related. The related graph will be a straight line graph since temperature and vapor pressure are directly proportional to one another.

Hence, Vapor pressure will increase with Temperature.

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