what is the molarity and molality of a solution prepared by mixing 23g of CaCl2 with 217g of water(assuming density of water is 1g/mol)​

Answer:

parent and offspring

Explanation:

I think probably what the question is referring to is in the context of biology, the "original organism" is known as the parent. The young that they reproduce are known as the offspring.

The offspring could be formed by the sexual reproduction of two parental organisms, or the asexual reproduction of just one parental organism.

Explanation:

Reversible reactions that happen in a closed system eventually reach equilibrium. At equilibrium, the concentrations of reactants and products do not change. But the forward and reverse reactions have not stopped - they are still going on, and at the same rate as each other.

Every reaction strives to reach a state of chemical equilibrium, which is the point where both the forward and backward processes are occurring at the same pace. The concentrations of the reactants and products are constant at equilibrium because the forward and reverse speeds are equal.

Chemical equilibrium is the state of a chemical process where both the reactants and products are present in concentrations that have no further tendency to change over time, preventing any discernible change in the system's properties.

When a chemical reaction is reversible, equilibrium is reached when the rate at which the forward reaction is moving equals the rate at which the reverse reaction is moving.

Even though the two reactions proceed at equal but opposite rates, there are no additional changes in the reactant and product concentrations. At some point, the forward and reverse reaction rates are identical; the rate at which reactants transform into products is the same as the rate at which products transform into reactants.

Thus, Every reaction strives to reach a state of chemical equilibrium, which is the point where both the forward and backward processes are occurring at the same pace.

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Answer:

Among Na ,K , Pb , Li , The atom which does not react with water is :

Pb

Explanation:

Li  : Reacts slowly with water

Na ,K  : Reacts vigorously with water

Pb : It does not reacts with water because :- Pb oxidize in presence of  atmospheric oxygen to form lead oxide (PbO) . this PbO form a layer over the surface of Pb and make it inert to water.

Answer:

To find the number of neutrons we would subtract the number of protons from mass number of an atom.

Explanation:

An atom consist of electron, protons and neutrons. Protons and neutrons are present with in nucleus while the electrons are present out side the nucleus.

All these three subatomic particles construct an atom. A neutral atom have equal number of proton and electron. In other words we can say that negative and positive charges are equal in magnitude and cancel the each other. For example if neutral atom has 6 protons than it must have 6 electrons. The sum of neutrons and protons is the mass number of an atom while the number of protons are number of electrons is the atomic number of an atom.

For example:

The mass number of carbon is 12 amu and it has six protons thus to find the number of neutrons we would subtract the 6 from 12 and get number of neutrons.

12- 6 = 6 neutrons

Answer:

Lower than the specific heat capacity of water

Explanation:

Specific heat capacity of a material is defined as the amount of heat needed to raise 1 g of that substance by [tex]1^oC[/tex]. Specific heat capacity is typically used in the equation which relates heat transfered to the product of specific heat capacity, mass and change in temperature, given by:

[tex]Q = cm\Delta T[/tex]

In this problem:

[tex]Q = 420 J[/tex]

[tex]m = 7 g[/tex]

[tex]\Delta T = 30^oC[/tex]

We may simply rearrange this equation for specific heat, c, in order to solve for its value:

[tex]c = \frac{Q}{m\Delta T} = \frac{420 J}{7 g\cdot 30^oC} = 2 \frac{J}{g^oC}[/tex]

We know that the specific heat capacity of water is:

[tex]c_w = 4.184 \frac{J}{g^oC}[/tex]

The value we obtained is lower than the specific heat capacity of olive oil.

The specific heat of olive oil is approximately 2 J/g °C, which is less than the specific heat of water.

The specific heat of olive oil can be calculated by using the formula: q = mcΔT, where q is the heat energy absorbed, m is the mass of the substance, c is the specific heat, and ΔT is the change in temperature. In this case, we are given the heat (q) as 420 J, the mass (m) as 7 g, and the change in temperature (ΔT) as 30 °C. Plugging these values into the formula, we get 420 J = c * 7 g * 30 °C. Solving for c, we find that the specific heat of olive oil is approximately 2 J/g °C.

Comparing this specific heat value to the specific heat of water, which is 4.184 J/g °C, we can conclude that the specific heat of olive oil is less than the specific heat of water.

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Answer:

0.6 Molar

Explanation:

According to the Question,

In 500 mL of water ,

0.2 mol sample of MgCl is present and 0.1 mol of KCl is present.

Thus ,

Concentration of Cl anion in the solution will be the sum of Cl anion concentration from MgCl and KCl.

From MgCl , 0.2 mol of Cl anion will come and 0.1 mol of KCl anion will come ,

Thus , 0.3 mol of Cl anion will come totally .

So, Cl anion concentration will be [tex]\frac{0.3}{0.5}[/tex] = 0.6 M

The concentration of Cl⁻ in the solution, after dissolving 0.20 mol MgCl₂ and 0.10 mol KCl and diluting to 500 mL, is 1.0 M.

To determine the concentration of Cl⁻ ions in the solution, we need to calculate the total moles of Cl⁻ ions from both MgCl₂ and KCl after dissolving them in water.

Magnesium chloride (MgCl₂) provides two moles of Cl⁻ for every mole of MgCl₂. Hence, 0.20 moles of MgCl₂ will produce 0.20 x 2 = 0.40 moles of Cl⁻.

Potassium chloride (KCl) provides one mole of Cl⁻ for every mole of KCl. Therefore, 0.10 moles of KCl will give 0.10 moles of Cl⁻.

Adding the total moles of Cl⁻ from both salts gives us 0.40 moles + 0.10 moles = 0.50 moles.

To find the concentration of Cl⁻ in the final solution, divide the total moles of Cl⁻ by the volume of the solution in liters. Since the solution volume is 500 mL, which is equivalent to 0.500 L, we perform the following calculation:
Concentration of Cl⁻ = 0.50 moles / 0.500 L = 1.0 M.

Therefore, the correct answer is that the concentration of Cl⁻ in the solution is 1.0 M.

Answer: false

Explanation: metal like sodium, potassium have just one oxidation number while metals like aluminium have 3

Answer:

Explanation:

Magnesium is present in second group of periodic table. It has two valance electrons. Oxygen us present in group sixteen it has six valance electrons.

Magnesium need to lose two valance electrons to complete the octet while oxygen needed two electrons to complete the octet.

When magnesium loses it two electrons it form magnesium cation Mg²⁺ and its two electrons transfer to the oxygen thus oxygen becomes anion O²⁻.

Both negative and positive charges attract each others and form magnesium oxide. MgO.

Chemical equation with electron dot illustration:

Reaction is given in attached file.

Answer:

Around worm because it gets bebefits such as food and habitat without killing its host..

Answer:

A roundworm living inside a dog and producing eggs which then get distributed to the environment through the dog's feces.

Explanation:

Parasitism is said to be an interaction between two organism whereby one organism benefit from the relationship and the other organism suffers. Most times the organism that suffers do not die instantly.

In the case of roundworm living inside a dog and producing eggs , the dog provides the necessary environment for the roundworm to strife. The roundworm enjoys the ingested foods from the dog and also comfortable environment devoid of predators. Even when the roundworm lay eggs the dog assist in the growth of the next generation by releasing it to the environment through feces. other animals later ingest the developed egg and the cycle continues.    

Answer:

They require only one electron to complete their outer shell

Explanation:

The elements of group 17 are called halogens. These are six elements Fluorine, Chlorine, Bromine, Iodine, Astatine. Halogens are very reactive these elements can not be found free in nature. Their high reactivity is due to the presence of seven valance electrons. They need just one electron to complete the octet that's why they can not found free in nature. Their chemical properties are resemble greatly with each other. As we move down the group in periodic table size of halogens increases that's way fluorine is smaller in size as compared to other halogens elements. Their boiling points also increases down the group which changes their physical states. i.e fluorine is gas while iodine is solid.

Consider the example of sodium chloride. Chlorine accept one electron from sodium and complete the octet.

The electronegativity of chlorine is 3.16 and for sodium is 0.93. There is large difference is present. That's why electron from sodium is transfer to the chlorine. Sodium becomes positive and chlorine becomes negative ion. Both atoms are bonded together electrostatic attraction occur between them and both get complete complete octet.

Answer:

1) have a high electronegativity

and

2) require only one electron to complete their outer shell

Explanation:

Answer:

56 is the mass

Explanation:

You would add 26 and 30(the protons and neutrons). I didn't add the electrons because they are so small their mass is negligible in this situation.

Answer:

Mass = 56

Explanation:

Answer: Metaphase

Explanation:

Metaphase is SECOND stage of mitosis, that follows prophase and comes before anaphase, during which condensed chromosomes become aligned before being separated.

During Metaphase, the chromosomes become visible due to the condensation, and the success of this stage determines whether anaphase will occur.

Therefore, metaphase is the second stage of mitosis.

Answer:s the solution expressed in the unit %. ... Solvent is a liquid which dissolves the solute.

Explanation:

Volume/volume percentage (v/v percent) is a measure of the concentration of a substance in a solution. It is expressed as the ratio of the volume of the solute to the total volume of the solution multiplied by 100. Examples: Wine has a typical alcohol content (v/v percent) of 12 percent.

Answer:

See the answer below, please.

Explanation:

The volume / volume percentage relates the volume of solute / solution volume and this is multiplied by 100.

In the case of weight / volume percentage, relate grams of solutes to milliliters of solution, then this is multiplied by 100.

Answer: 612C

Explanation: 49B + 24He —> 612C + 01n

Nitrogen is 1.25 g/L

Sulfur dioxide is 2.86 g/L

Methane is 0.714 g/L

Hope I helped :)

Explanation:

The formula used :

[tex]PM=dRT[/tex]

Where:

P = pressure of the gas

M = Molar mass of the gas

d = Density of the gas

T = temperature of the gas

R = Universal gas constant = 0.0821 atm L/mol K

A.

The density of the gas at STP, d = 1.25 g/L

Pressure of the gas = 1 atm

Temperature of the gas = T = 273 K

[tex]M=\frac{dRT}{P}=\frac{1.25 g/L\times 0.0821 atm l/mol k\times 273 K}{1 atm}[/tex]

M = 28.01 g/mol

Molar mass of nitrogen gas =28 g/mol ≈ 28.01 g/mol

The density of nitrogen gas at STP is 1.25 g/L.

B.

The density of the gas at STP, d = 2.86 g/L

Pressure of the gas = 1 atm

Temperature of the gas = T = 273 K

[tex]M=\frac{dRT}{P}=\frac{2.86g/L\times 0.0821 atm l/mol k\times 273 K}{1 atm}[/tex]

M = 64.10 g/mol

Molar mass of sulfur dioxide gas = 64g/mol ≈ 64.10 g/mol

The density of sulfur dioxide gas at STP is 2.86 g/L.

C.

The density of the gas at STP, d = 0.714 g/L

Pressure of the gas = 1 atm

Temperature of the gas = T = 273 K

[tex]M=\frac{dRT}{P}=\frac{0.714 g/L\times 0.0821 atm l/mol k\times 273 K}{1 atm}[/tex]

M = 16.00 g/mol

Molar mass of methane gas = 16 g/mol

The density of methane gas at STP is 0.714 g/L.

Answer:

Carbohydrates

Explanation:

You would eat carbohydrates as they supply your body with lots of short-term energy that can be burned at a fast rate.

Answer:

Explanation:

Molar mass:

Molar mass of substance is sum of atomic weight of all the atoms of elements present in it.

HCl

Atomic weight of hydrogen = 1.008 amu

Atomic weight of chlorine = 35.5 amu

Atomic weight of HCl =  1.008+ 35.5 = 36.508 g/mol

K₂CO₃:

Atomic weight of potassium = 39.0893 × 2 = 78.1786 amu

Atomic weight of carbon = 12 amu

Atomic weight of oxygen = 16×3 = 48 amu

Atomic weight of K₂CO₃ =  48+12+ 78.1786 = 138.178 g/mol

Ca(OH)₂:

Atomic weight of calcium = 40 amu

Atomic weight of oxygen = 16× 2 amu = 32 amu

Atomic weight of hydrogen = 1.008× 2 = 2.016 amu

Atomic weight of Ca(OH)₂ = 74.016 g/mol

Na₃PO₄:

Atomic weight of sodium = 23×3= 69 amu

Atomic weight of phosphorus = 31 amu

Atomic weight of oxygen = 16 × 4 = 64 amu

Atomic weight of Na₃PO₄= 69+31+64 = 164 g/mol

Answer:

Physical Property

Explanation:

Magnetism is temporary untill you seperate the objects. There is no chemical change involved before, after, or during.

The attraction of certain materials to a magnet is a physical property of matter because it doesn't involve a change in the chemical composition of the material but rather relates to the arrangement and behavior of its electrons.

The attraction of certain types of matter to a magnet is a physical property of matter. Physical properties are characteristics of a substance that can be observed or measured without altering the substance's chemical composition. Magnetism is one such property that describes a material's ability to be attracted to or repelled by a magnet.

The phenomenon of magnetism arises from the alignment and behavior of the electrons in the atoms or molecules of a material. Materials that exhibit magnetic properties have domains where the magnetic moments of the individual atoms or molecules align in a particular direction. When exposed to an external magnetic field, these domains can align with the field, causing the material to be attracted to the magnet.

Importantly, this attraction is reversible and does not involve a change in the material's fundamental chemical composition. When the magnetic field is removed, the material returns to its original state. Common magnetic materials, such as iron, nickel, and cobalt, have unpaired electrons in their electron configurations, which allows them to exhibit strong magnetic properties.

In contrast, chemical properties of matter involve changes in the chemical composition of substances, such as reactions that form new compounds or alter the arrangement of atoms within molecules.

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Answer:?

Explanation:?

Answer:

Phosphorus

Explanation:

As we move from left to right across the periodic table the number of valance electrons in an atom increase. The atomic size tend to decrease in same period of periodic table because the electrons are added with in the same shell. When the electron are added, at the same time protons are also added in the nucleus. The positive charge is going to increase and this charge is greater in effect than the charge of electrons. This effect lead to the greater nuclear attraction and electronegativity increases.

As we move down the group atomic radii increased with increase of atomic number. The addition of electron in next level cause the atomic radii to increased. The hold of nucleus on valance shell become weaker because of shielding of electrons thus electronegativity decreases.

Silicon is present in group 4A and Phosphorus and Arsenic is present in group 5A thus electronegativity of silicon is less than Phosphorus and arsenic. Arsenic is present down to phosphorus thus its electronegativity will less than phosphorus.

P = 2.19

Si = 1.9

As = 2.18

Answer:

By tracking oxidation numbers we can identify the number electron in the atom

Explanation:

Tracking of electrons helps us to know when and how many electrons get transferred from one atom to other atom . Oxidation  referred as the “loss of one or more electrons” by an atom. When the oxidation number of an element increases, there is a loss of electrons and that element is being oxidized. Oxidation numbers are usually written with the sign (+plus or −minus) followed by the magnitude, which is the opposite of charges on ions. In their elemental stage oxidation number of an atom is zero.  

Final answer:

Oxidation numbers are used to track electrons in atoms. By assigning oxidation numbers based on certain rules, we can determine what is being oxidized and what is being reduced in a redox reaction.

Explanation:

Oxidation numbers are used to keep track of electrons in atoms. They are assigned to atoms based on four rules. Oxidation is an increase in oxidation number (loss of electrons), while reduction is a decrease in oxidation number (gain of electrons). By tracking oxidation numbers, we can determine what is being oxidized and what is being reduced in a redox reaction. For example, in the reaction where carbon reacts with oxygen to form carbon dioxide, the oxidation number of carbon changes from zero in the reactants to +4 in the product, indicating that carbon is being oxidized. On the other hand, the oxidation number of oxygen changes from zero to -2, indicating that oxygen is being reduced.

Answer:

Begin to succumb to the power of gravity because of the decrease in lift

Explanation:

Final answer:

An airplane climbing to altitudes higher than 300,000 ft would struggle with decreased lift due to lower air density and would not necessarily require an extra engine. Engines produce less power with increased altitude, so the airplane must efficiently use its existing engines to maintain climb without compromising lift. So the correct option is D.

Explanation:

When an airplane attempts to fly higher than 300,000 ft, it would not typically need an extra engine but will begin to succumb to the power of gravity because of the decrease in lift, that is, option D. At such altitudes, the air density is much lower, meaning there is less air to generate lift. Indeed, for straight and level flight, an aircraft must maintain a balance where the thrust equals the drag. As the airplane ascends, the air becomes thinner (density altitude increases), and to maintain the same lift, the aircraft would need to travel at higher speeds or have a greater angle of attack. However, the engines' efficiency also decreases with altitude, as they are designed to operate optimally within certain atmospheric conditions.

Furthermore, jet engines, like turbojets, produce less power at higher altitudes due to the reduced air density. Thrust from engines does not counteract drag by increasing the number of engines but by optimizing performance of existing engines. To climb and maintain velocity, aircraft need to produce enough excess power to convert that energy into increased potential energy without compromising the energy needed for maintaining lift.

The student needs to understand that the trade-off between kinetic and potential energy in an aircraft is similar to a car climbing a hill. To increase altitude without losing speed, additional power is required to offset the energy directed towards increasing altitude. Thus, the aircraft must be capable of generating the additional power needed to climb, which becomes more challenging as altitude increases.

Answer:

NO decreases the activation energy and increases the rate of a reaction

Explanation:

To fully comprehend this problem, we wish to understand the role of a catalyst in a chemical reaction. Catalyst is a substance which is essentially consumed and then reproduced (that said, its mass remains the same and the net mass consumed is equal to 0) in a chemical reaction which:

Addition of a nitrogen monoxide catalyst would therefore decrease the activation energy and increase the rate of a reaction.

Now, in terms of equilibrium (if the reaction is at equilibrium, as just a right arrow is indicated), since nitrogen monoxide is a gas, there would be no shift in equilibrium towards the products or reactants, as addition of an inert gas to an equilibrium system would decrease the partial pressures of each component equally.

For the given reaction, according to the Law of Conservation of Energy, the energy required to decompose Hcl and produce [tex]H_{2}+c l_{2}[/tex] are equal.

Answer: Option C

Explanation:

According to law of conservation's of energy, energy can only be transferred from reactants to product side. So in this process, it is stated that 185 kJ of energy will be needed to decompose it. So that 185 kJ of energy will be getting transferred to produce the creation of hydrogen and chloride in the product side.

So if we see from the reactants side, the energy of 185 kJ is required for decomposition of hydrogen chloride. Similarly, if we see from the product side, the 185 kJ utilized for decomposition is transferred as energy required to create hydrogen and chlorine atoms. This statement will be in accordance with the law of conservation's of energy.

Answer:

the answer is b ^ that person is wrong

Explanation:

Answer:

Paired = 12

Unpaired = 0

Explanation:

Magnesium is alkaline earth metal.

It is present in second group.

Its atomic number is 12 and atomic mass 24 amu.

Electronic configuration:

Mg₁₂ = 1s² 2s² 2p⁶ 3s²

It can seen from electronic configuration that all electrons are paired because s subshell have one orbital and it can accomodate two electrons. Each s subshells in magnesium have two electrons so these are filled and have paired electrons. While p subshell have three orbitals and can accomodate six electrons two by each orbital with opposite spin thus 2p is also filled and have paired electrons.

Answer:

Separation method for various ingredients are

1. Paneer from curdled milk.  - Filtration

2. Chalk powder from water.  - Filtration

3. Sand from salt solution. - Evaporation

4. Saw dust from water.  - Skim off, sieve or filter

5. Tea leaves from brew. - Filtration.

Explanation:

By the help of a muslin cloth the paneer is separated from the curdled milk, the process is called as the filtration. The paneer will remain in the cloth and curdled milk will be removed. Separation of chalk powder from water is very easy by the process of filtration, after the filtration the chalk powder retentate and the filtrate obtained is the water in absence of chalk.  Salt and sand water separation can be done with the help of evaporation. Separation of the saw dust from water takes place by the method of sieving or sedimentation. The tea leaves are separated from brew by filtration.

Answer:

Explanation:

Zinc-64  = 30 proton, 30 electron and 34 neutron

chlorine-37 = 17 proton, 17 electron and 20 neutron

hydrogen-3 = 1 proton, 1 electron and 2 neutron

calcium-40 = 20 proton, 20 electron and 20 neutron

The numbers in front are the mass number, the number of proton equal number of electron in a neutral atom and these atoms do carry charge which means they are neutral. To calculate the number of neutron simply subtract the number of proton from the mass number

The shorthand composition of atoms is represented as Element-Mass number. Examples include Zinc-64 as ^64Zn, Chlorine-37 as ^37Cl, Hydrogen-3 as ^3H, and Calcium-40 as ^40Ca.

The composition of each atom can be expressed using shorthand notation based on the atomic number and mass number. This format is usually represented as Element-Mass number.

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I'll try to explain this in the simplest way I've learned it.

What the last column basically meant was that if the second word of the compound has a negative ion charge

and contains oxygen it will give the the compound a name ending with -ate

Answer:

Sb

Explanation:

The given elements are present in group 5th A in Following order:

N

P

As

Sb

As we move down the group atomic radii increased with increase of atomic number. The addition of electron in next level cause the atomic radii to increased. The hold of nucleus on valance shell become weaker because of shielding of electrons thus size of atom increased.

As the size of atom increases the ionization energy from top to bottom also  decreases because it becomes easier to remove the electron because of less nuclear attraction and as more electrons are added the outer electrons becomes more shielded and away from nucleus.

Thus antimony have largest atomic radius.

Out of the four options, Sb has the highest atomic radius.

Answer: acid react with metals to form H2.

Explanation: metals which are more electropositve than hydrogen will always displaced hydrogen from acids. The equation below show how hydrogen is displaced from acid

Zn + 2HCl -—> ZnCl2 + H2