Why are prefixes not used in naming ionic compounds?

Answer:

poor hydrogen-ion donor

Explanation:

Acid dissociation constant constant chemistry is the equilibrium constant of the dissociation reaction of an acid, it is denoted by Ka. This equilibrium constant is a measure of the strength of an acid in a solution.

Note these as a rule of thumb:

When Ka is large, the dissociation of the acid is favored.

When Ka is small, the acid does not dissociate to a large extent.

Hence, a Ka of 4.3 x 10-7 shows a weak acid. A weak acid is a poor hydrogen ion donor because it does not dissociate to a large extent in solution.

According to its chemical reaction where it donates a hydrogen ion, and despite having a small Ka value, H2CO3 (carbonic acid) can be classified as a relatively good hydrogen-ion donor.

Given that the equation  H2CO3 = H+ + HCO3- represents the dissociation of carbonic acid into a hydrogen ion (H+) and a bicarbonate ion (HCO3-), H2CO3 can be identified as a good hydrogen-ion donor. This is because in this reaction, it readily gives up a hydrogen ion, which is characteristic of acid behavior. An acid's strength is determined by its ability to donate hydrogen ions, and the bigger the constant Ka value, the stronger the acid. However, a Ka of 4.3 x 10-7 is quite small, indicating that carbonic acid does not completely ionize in solution but it's relatively better at donating hydrogen ions than accepting them.

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Answer:

200 m/s.

Explanation:

The car's velocity after 3 seconds can be calculated using the kinematic equation:

v= u+ at

Given:

- Initial velocity, u = 50m/s

- Acceleration, a = 50m/s2

- Time, t = 3 s

Plugging the values into the equation:

v = 50 + 50 * 3

v = 50 + 150

v = 200 m/s

Therefore, the car's velocity after 3 seconds will be 200 m/s. Hope this helps!!

The car's velocity after 3 seconds is 200 m/s, calculated using the formula for final velocity with an initial velocity of 50 m/s and an acceleration of 50 m/s².

To find the final velocity of a car with an initial velocity and constant acceleration, you can use the formula v = u + at, where v is final velocity, u is initial velocity, a is acceleration, and t is time.

In this case, the car has an initial velocity (u) of 50 m/s and a constant acceleration (a) of 50 m/s². After 3 seconds (t), we can calculate the final velocity using the formula:

v = u + at
v = 50 m/s + (50 m/s² × 3 s)
v = 50 m/s + 150 m/s
v = 200 m/s

Therefore, the car's velocity after 3 seconds is 200 m/s.

Answer:

18.8

Explanation:

Just trust me it’s Ap3x Things

Answer:

18.8

Explanation:

*wink wink*

The steps which we taken into consideration during the changing of state of water from ice to steam are by increasing the temperature or by providing heat.

When any amount of energy is released or absorbed by any matter as a result of which changes in state of matter of substance takes place.

Hence, the steps that required to change ice to steam is by increasing temperature.

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Answer:

c

Explanation:

edge 2023

Common errors in atomic models can include incorrect placement of subatomic particles, improper scale, misunderstanding of atomic space, or misrepresentation of electron paths as demonstrated in the Bohr model.

Without seeing the specific diagram referenced in the question, it's hard to identify the exact flaw in the model of the atom. However, common mistakes in atomic models often include misplacing the subatomic particles (protons, neutrons, and electrons), misunderstanding the scale of the atom, or ignoring the fact that atoms are mostly empty space. For example, in the Bohr model of the atom, electrons orbit the nucleus in definite paths, which is an inaccurate depiction according to quantum mechanics.

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Answer:

The hydrogen ion concentration of the substance is 3.16*10⁻⁵ M

Explanation:

pH is a parameter used to measure the degree of acidity or alkalinity of a substance. The pH is calculated as the negative logarithm (base 10) of the concentration of hydronium ions [H₃O⁺] or hydrogen ions [H⁺].

pH= - log [H₃O⁺]= - log [H⁺]

Values ​​on the pH scale range from 0 to 14, where pH equal to 7 is neutral, below 7 is acidic and above 7 is basic.

In this case, pH= 4.5

So:

4.5= - log [H⁺]

Solving:

[ H⁺]= 10⁻⁴ ⁵

[H⁺]= 3.16*10⁻⁵ M

The hydrogen ion concentration of the substance is 3.16*10⁻⁵ M

The empirical formula is Diphenyl ether. 2-Phenylphenol, or o-phenylphenol.

For the empirical formula of a compound, you need to find the simplest, whole-number ratio of the elements present in the compound. The given molecular formula is C12H10O.

1. Determine the number of moles for each element:

  Carbon (C): 12 moles

  Hydrogen (H): 10 moles

  Oxygen (O): 1 mole

2. Find the simplest, whole-number ratio by dividing each mole value by the smallest number of moles (which is 1 in this case):

  C: 12 moles / 1 = 12

  H: 10 moles / 1 = 10

  O: 1 mole / 1 = 1

So, the empirical formula is Diphenyl ether. 2-Phenylphenol, or o-phenylphenol.

Answer:

Air, liquids or solids.

Explanation:

Sound is a form of mechanical waves, which needs a material medium to propagate. There is no sound in the void. Sound can be propagated in gases, liquids and solids. The best choice is "Air, liquids or solids".

Answer:C

Explanation:

on edge

Answer:

B. covers all body surfaces

Explanation:

epi=upper (outside of skin)

- Hope that helps! Please let me know if you need further explanation.

Answer: [tex]Rate=\frac{\Delta_{\text {reactants or products}}}{\Delta_{time}}[/tex]

Explanation:

Rate law says that rate of a reaction is directly proportional to the concentration of the reactants each raised to a stoichiometric coefficient determined experimentally called as order.

Rate of reaction can be defined in terms of reactants or products. It is the ratio of disappearance of reactants per unit time or ratio of appearance of products per unit time.

[tex]Rate=\frac{\Delta_{reactants}}{\Delta_{time}}[/tex] or [tex]Rate=\frac{\Delta_{products}}{\Delta_{time}}[/tex]

[tex]S_{products}-S_{reactants}[/tex] gives the entropy change for the reaction.

[tex]\Delta H-T\Delta S[/tex] gives Gibbs free energy.

[tex]PV=nRT[/tex] is the ideal gas equation.

Final answer:

Chemical kinetics equation for reaction rates and how rates of reactions depend on reactant and product concentrations.

Explanation:

Reaction rates in chemical kinetics are described by the equation: rate = k[A]m[B]n , where k is the rate constant, m and n are exponents determined experimentally, and m+n is the reaction order.

The rate of a chemical reaction can be expressed as the change in concentration of reactants or products over time. In general, the rate of reaction depends on the concentration of reactants or products involved in the reaction.

For a net forward reaction under rapid equilibrium conditions, the rate equation can be derived and expressed in terms of concentrations of reactants and products.

Answer:

C. It makes sure there is a balance inside the body

Explanation:

Hope this helps

Answer:

C. It make sure there is a balance inside the body.

Explanation:

Homeostasis in the body tries to maintain the norm for the survival of the body. This includes temperature & amount of fluids inside the body. If they are too out in the end of the spectrum, your brain will tell you that you need to obtain it, such as drinking more water, going to a cool place if you are in the heat, or to obtain warmth if you are in the cold.

Answer:

c) ensure the results are accurate

Explanation:

you don't really know they're accurate unless you get them 2+ times

Answer:B)

The sample size of five was too small.

Explanation:

Answer:

Q = 63.75J

Explanation:

Mass = 2.5g

Initial temperature (T1) = 25°C

Final temperature (T2) = 50°C

Specific heat capacity of Mg = 1.020J/g°C

Heat energy = ?

Heat Energy (Q) = mc∇T

Q = heat energy

M = mass of substance

C = specific heat capacity of substance

∇T = change in temperature = T2 - T1

Q = mc∇T

Q = mc(T2 - T1)

Q = 2.5 × 1.020 × (50 - 25)

Q = 2.55 × 25

Q = 63.75J

The heat energy required to raise magnesium metal from 25°C to 50°C is 63.75J

Answer:

V = 7.8 L

Explanation:

Message

The volume of gas of 0.323 mole sample of a gas at 265 K and 0.900 atm is 7.798L.

Ideal gas equation gives idea about the behavior of gas at different condition & represented as:

PV = nRT, where

On putting all these values on the above equation, we get

V = (0.323)(0.082)(265) / (0.9) = 7.798 L

Hence required volume of gas is 7.79L.

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Answer:

D

Explanation:

It depend on your parents genes. What they have, is what you'll have.

~Jack Pullman

p.s. Mark for brainiest!

Answer:

C. Nutrition and Enviroment

Explanation:

An individual growing up in poverty will not get as the good nutrition as an individual from a rich household. Nutrition affects growth, so malnutrition can make a person shorter and ruining their potentially taller height.

The elements on the periodic table that form cations in ionic compounds are primarily found in the alkali metals (group 1), alkaline earth metals (group 2), transition metals  and the representative metals. These elements lose electrons to achieve a stable electron configuration and form cations with positive charges.

The areas of the periodic table that contain elements which form cations in ionic compounds are primarily the groups that contain metals. These are the alkali metals (group 1), alkaline earth metals (group 2) and transition metals (groups 3-12). These elements lose electrons and form cations with positive charges. For example, an atom of an alkali metal like sodium (Na) loses one electron and forms a cation with a 1+ charge.

Transition elements and post-transition metals can also form cations in ionic compounds. Although their charges can vary, they often lose electrons to achieve a stable electron configuration.

These are termed as representative metals, including aluminum, zinc, and tin, which can exhibit different positive charge magnitudes based on their group and period. For instance, aluminum (Al) from group 13, and zinc (Zn) from group 12, commonly lose 3 and 2 electrons respectively to form cations.

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Answer:

Blue

Explanation:

It is the closest color to violet.

The color which has the highest energy is the blue color because it have low wavelength value.

Energy of any waves of color will be calculated by using the below equation as:

E = hυ, where ............... (i)

h = plank's constant

υ = frequency of wave

Frequency is inversely proportional to wavelength (λ) as:
υ = c/λ, where ................. (ii)

c = speed of light

From (i) & (ii)

E = hc/λ

From this we conclude that wavelength is inversely proportional to energy and wavelength of blue color is smaller than other so that it will have higher energy.

Hence blue color has the highest energy.

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Answer:

Solute, solvent

Explanation:

In a solution, the substance that is dissolved is called the solute, and the substance that does the dissolving is called the solvent. Together, they form a solution, which is a homogeneous mixture where the solute is evenly distributed in the solvent.

In a solution, the substance that gets dissolved is called the solute. For instance, when you make a cup of tea, the tea leaves (or tea bag) represent the solute, as they get dissolved in the water. Meanwhile, the substance that does the dissolving is referred to as the solvent. In the tea example, the water would be the solvent because it is the substance that dissolves the tea leaves or tea bag.

The process of a solvent dissolving a solute results in a solution, a homogeneous mixture where the solute is uniformly distributed within the solvent.

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Answer:Chemical energy

Explanation:

Answer:

Density directly proportional to mass and inversely proportional to volume, if you increase the density of the mass increases and vice versa, if you increase the volume density decreases and vice versa.

A compound is something that is composed of two or more separate elements; a mixture.

Explanation:

Answer:

0.0679

Explanation:

Answer:

It is not a gas because its particles do not have large spaces between them.

Explanation:

Answer:

19.2g

Explanation:

The equation of the reaction is;

Li3N(s) +3H2O(l) ---->NH3(g) +3LiOH(aq)

From Avogadro's law we know that 1 mole of any gas occupies a volume of 22.4 L under standard conditions.

It is also clear from the equation that 1 mole of lithium nitride produces 1 mole of ammonia occupying 22.4L volume

Hence;

1 mole of Lithium nitride yields 22.4 L of ammonia

x moles of lithium nitride yields 12.26L of ammonia

x= 12.26×1/22.4

x= 0.55 moles of lithium nitride

Molar mass of lithium nitride= 34.83 g/mol

Mass of lithium nitride = number of moles × molar mass

Mass of lithium nitride= 0.55 moles × 34.83 g/mol

Mass of lithium nitride = 19.2g

Answer:

The mass of lithium nitride that produces 12.26 L of ammonia is 19.053 g

The mass of lithium hydroxide produced is 39.3 g

Explanation:

Water and Lithium nitride combine to form ammonia and lithium hydroxide the  equation for the reaction being;

Li₃N(s) + 3H₂O(l) → NH₃ (g)  + 3LiOH (aq)

That is 1 mole of lithium nitride combines with 3 moles of water molecules to form 1 mole of ammonia gas plus 3 moles of lithium hydroxide

Whereby the volume of ammonia produced is 12.26 L, we have at STP

PV = nRT

Therefore, n = PV/RT

Where:

P = Pressure = 1 atm

V = Volume = 12.26 L

R = Universal gas constant = 0.08205 L·atm/(mol·K)

T = Temperature = 273.15 K

Plugging the values in gives;

n = (1×12.26)/(0.08205×273.15) = 0.547 moles

Since 1 mole of lithium nitride forms 1 mole of NH₃, 0.547 mole will be required to produce 0.547 moles of NH₃ and 3×0.547 or 1.64 moles of LiOH

Molar mass of Li₃N = 34.83 g/mol

Molar mass of LiOH = 23.95 g/mol

Since mass = Number of moles × molar mass, we have;

Mass of Li₃N = 0.547 × 34.83 = 19.053 g  

Mass of LiOH = 1.64 × 23.95 = 39.3 g

Therefore;

The mass of lithium nitride that produces 12.26 L of ammonia = 19.053 g

The mass of lithium hydroxide produced = 39.3 g.

Answer:

82

Explanation:

Atomic number of the isotope is 26 and it has a mass number of 56

X = ⁵⁶₂₆Fe

The three main subatomic particles in an atom are

1. Proton

2. Neutron

3. Electron

The number of protons and electrons are usually equal so as to maintain electrical neutrality in the atom except in cases where it's a charged particles hence the number of proton and electrons will differ.

In this case, the atomic number is 26 and atomic numbers are also known as the number of protons (positively charged particle).

Proton = 26

Electrons = 26 (since it's a naturally charged particle)

Neutron = ?

Mass number = sum of proton and neutrons. This variation in the mass number usually leads to isotopes of an atom and this is mainly caused by variation in the number of neutrons eg. Carbon-12 and Carbon-13 have different number of neutrons.

Mass number = protons + neutrons

Neutrons = mass number - protons

Neutrons = 56 - 26

Neutrons = 30

Subatomic particles present are

Protons = 26

Electrons = 26

Neutrons = 30

Total number = (26 + 26 + 30) = 82

The total number of subatomic particles is 82.

The total number of subatomic particles in the nucleus of this common isotope of iron (with an atomic number of 26 and a mass number of 56) is the sum of protons and neutrons, which is 56.

An isotope is a variant of an element that has the same number of protons (which is the atomic number) but differs in the number of neutrons. The atomic number of iron (Fe) is 26, which reflects the number of protons in the nucleus. The mass number (56) is the combined total of protons and neutrons in the nucleus. Since we know there are 26 protons (from the atomic number), the remainder must be neutrons. So, 56 (mass number) minus 26 (atomic number) gives us 30 neutrons.

Therefore, the total number of subatomic particles in the nucleus of this isotope of iron is 26 (protons) + 30 (neutrons) = 56 particles in total.

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