pleasw help me do you have any trick to memrise formulas of ores?​

the value of work done is -235.73 J. The negative sign indicates that the work done is against the external pressure.

The chemical reaction produces gas that pushes the piston upward against an external pressure of 1.5 atm so that the volume of the gas changes from 0.95 L to 2.5 L. The work (in joules) can be calculated as follows:

W = -PΔV

where,

W = work done

P = external pressure

ΔV = change in volume

We are given the following values:

P = 1.5 atm

ΔV = 2.5 L - 0.95 L = 1.55 L

Substituting the given values in the formula for work done,

W = -PΔV = -(1.5 atm) (1.55 L) = -2.325 atm L

Converting the units of pressure and volume to SI units,

W = -2.325 atm L × 101.3 J L⁻¹ atm⁻¹ × (1 m³ / 1000 L) = -235.73 J

Thus, the value of work done is -235.73 J. The negative sign indicates that the work done is against the external pressure.

learn more about work done here

https://brainly.com/question/25573309

#SPJ11

Answer:

Iconic, neutral, and cation

Explanation:

When a metal and a nonmetal react, the result is a(n) Ionic compound. Ratio of cat ions and anion depends on the ionic charge of each. All ionic compounds come together in the simplest ratio to make a  neutral formula unit and the cation  is always written first in the formula.

The ionic compounds are solids in crystalline form and these are formed by opposite charged ion packing,  formed by the reaction of metals react with non-metals.

Elements can either gain or lose electrons in order to achieve noble gas configuration and these formation of ions helps them gain stability, the structure of ionic compound depend on the relative sizes of the cations and anions.

Ionic compounds are salts, oxides, hydroxides, sulphides, and the inorganic compounds. Ionic solids are held together by the electrostatic attraction between the positive and negative ions.

Learn more about ionic compound, here:

https://brainly.com/question/977324

#SPJ2

For the lighter nuclei up to atomic number 20, the number of neutrons increases at the same exact rate as the protons increase in number. For the heavier nuclei, the increase in the number of neutrons is faster than the protons increase.

The neutron-proton ratio or N/Z ratio of an atomic nucleus can be described as the ratio of its number of neutrons to its number of protons. Among stable nuclei, the neutron-proton ratio increases with increasing atomic number.

Because electrical repulsive forces between protons with distance are different than strong nuclear force attractions. Proton density in stable larger nuclei should be lower than in smaller stable nuclei.

For each element with atomic number Z up to that of calcium (Z = 20), there exists with N/Z ratio of one, except beryllium (N/Z = 1.25). Uranium-238 has the highest N/Z ratio of 1.587, while lead-208 has the highest N/Z ratio at 1.537.

For the heavier nuclei, the N/Z ratio is greater than 1 so the number of neutrons is greater than the protons.

Learn more about neutron-proton ratio, here:

https://brainly.com/question/17699889

#SPJ1

Answer:

Explanation:

1.0

⋅

10

−

7

Explanation:

Start by writing a balanced chemical equation for the partial ionization of the acid

HA

(aq]

+

H

2

O

(l]

⇌

A

−

(aq]

+

H

3

O

+

(aq]

Notice that you have

1

:

1

mole ratios across the board. For every mole of acid that ionizes in aqueous solution, you get one mole of its conjugate base and one mole of hydronium ions,

H

3

O

+

.

In other words, the equation produces equal concentrations of conjugate base and hydronium ions.

Now, you can use the pH of the solution to calculate the equilibrium concentration of the hydronium ions.

pH

=

−

log

(

[

H

3

O

+

]

)

⇒

[

H

3

O

+

]

=

10

−

pH

In your case, the pH of the solution is equal to

4

, which means that you'll have

[

H

3

O

+

]

=

10

−

4

M

By definition, the acid dissociation constant,

K

a

, will be equal to

K

a

=

[

A

−

]

⋅

[

H

3

O

+

]

[

HA

]

The expression for the acid dissociation constant is written using equilibrium concentrations. So, if the reaction produced a concentration of hydronium ions equal to

10

−

4

M

, it follows that it also produced a concentration of conjugate base equal to

10

−

4

M

.

Because the initial concentration of the acid is considerably higher than the concentrations of the conjugate base and hydronium ions, you can approximate it to be constant.

This means that the acid dissociation constant for this acid will be

K

a

=

10

−

4

⋅

10

−

4

0.100

=

1.0

⋅

10

−

7

This is the underlying concept behind an ICE table

HA

(aq]

+

H

2

O

(l]

⇌

A

−

(aq]

+

H

3

O

+

(aq]

I

0.100

0

0

C

(

−

x

)

(

+

x

)

(

+

x

)

E

0.100

−

x

x

x

Here

x

represents the equilibrium concentration for the conjugate acid and hydronium ions. Since you know that

x

=

10

−

4

, you will have

K

a

=

10

−

4

⋅

10

−

4

0.100

−

10

−

4

Once again, you can use

0.100

−

10

−

4

=

0.0999

≈

0.100

to get

K

a

=

10

−

8

0.100

=

1.0

⋅

10

−

7

Flood plains are desirable farm land in spite of the fact that they are prone to flooding because of its high fertility.

Floodplains are very fertile agricultural areas because the floods carry nutrient-rich silt and sediment and deposited it that plains. Floodplains are flat which make easier farming.

So we can conclude that flood plains are desirable farm land because of its high fertility.

Learn more about floodplain here: https://brainly.com/question/1000851

The element with the symbol "K" refers to potassium. To determine the number of electrons in each energy level (shell) for potassium, we can refer to the periodic table.

Potassium has an atomic number of 19, indicating that it has 19 electrons. The electron configuration of potassium is 1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹. Based on this configuration, we can assign the number of electrons in each energy level as follows:

=1 (first energy level): 2 electrons

=2 (second energy level): 8 electrons

=3 (third energy level): 8 electrons

=4 (fourth energy level): 1 electron

Learn more about electron configuration here: brainly.com/question/30849672

#SPJ11

Osmosis is the movement of water molecules from an area of higher water concentration to an area of lower water concentration across a semipermeable membrane.

This movement of water occurs because of the tendency for water to move towards a higher solute concentration in order to achieve equilibrium. Solutes are particles that are dissolved in water and they decrease the amount of available water molecules. Therefore, when solute concentration is higher on one side of a semipermeable membrane, the water molecules move towards the solute in order to balance out the concentration levels on both sides. This process is crucial for many biological processes such as maintaining proper cell function and the absorption of nutrients in plants.

Osmosis is the process in which water molecules move across a selectively permeable membrane from an area of lower solute concentration to an area of higher solute concentration. This movement continues until an equilibrium is reached, where the solute concentrations are equal on both sides of the membrane.

To know more about molecules visit:

https://brainly.com/question/30465503

#SPJ11

Answer: (ii) measuring cylinder / pipette / burette

Explanation:

Answer:

NH3 and HCl

Explanation:

NH3 and HCl are acids because of their hydrogen ions. NHO3 and NaOH are bases (you can tell because they have an OH). I don't believe SCl2 is an acid or a base

The number of electrons in each shell of an N-14 atom in the ground state is 7.

The N-14 atom is nitrogen isotope. It has seven protons and seven neutrons. N-14 is a neutral atom having seven electrons. An atom's first shell has only two electrons which occupies an s orbital.

The total number of neutrons which are present in the nucleus are equal to the difference among the atomic number and mass number of an atom.

The nitrogen-14 isotope is having mass number as 14 and an atomic number as 7.

Nitrogen-14 is one of two stable isotopes of nitrogen which are non-radioactive. It makes about 99.63% of nitrogen which is naturally present. Nitrogen-14 is stable nuclides which have both an number of seven protons and seven neutrons. It is the only one which forms up more than half of its element.

To learn more about atoms,

brainly.com/question/75208

#SPJ1

The range for the target ph of a buffer solution that would favours ph stabilization unders this condition in (4.75-4.85).

What is Henderson Hasselback equation ?

The Henderson-Hasselbalch equation, pH = pKa + log([A]/[HA]), can be used to determine the pH of a buffer. The terms "HA" and "A" in this equation stand for the equilibrium concentrations of the conjugate acid-base pair that were employed to make the buffer solution.

What is acetate?

A proton is taken out of the carboxy group of acetic acid to produce acetate, a monocarboxylic acid anion. It performs a function as a Saccharomyces cerevisiae metabolite as well as a human metabolite. The base is a conjugate of an acetic acid. ChEBI. Alternatives to ACETIC ACID

The Henderson Hasselback equation for a suitable acetic acid / acetate buffer-

Ph= Pka + log (salt)/(acid)

(salt) = (acetate)

(acid) = (acetic acid)

now, CH3 COOH dissociates as

CH3COOH ⇔ CH3COOH +H

Pka for CH3COOH = 4.75

If a chemical reaction produced hydroxide ions, then CH3COOH gets consumed and more acetate ions with produces. This leads to change in Ph of the solution as due (CH3C00H-) increases the ph absence increases.

The range for the target ph of a buffer solution that would favours ph stabilization unders this condition in (4.75-4.85)

The buffer capacity is the ability of a given buffer to resist any changes in ph when small amount of acid or base added to it.The buffer capacity of a mixed weak acid( here Acetic acid)-base (NaOH) buffer is much greater when the individual pKa values are in close proximity with each other.

Therefore, The range for the target ph of a buffer solution that would favours ph stabilization unders this condition in (4.75-4.85).

Learn more Henderson Hasselback equation about from the given link.

https://brainly.com/question/13423434

#SPJ4

In the given question, option a. 2.82 is the predicted ratio of the amount of oxygen atoms to the number of magnesium atoms on Earth.

Matter is anything that has mass and takes up space. It can exist in different forms, such as solid, liquid, or gas, and it is made up of tiny particles called atoms.

To estimate the ratio of the number of oxygen atoms to the number of magnesium atoms on earth, we need to compare the mass percentage of each element with their atomic masses.

The atomic mass of oxygen is 16, while the atomic mass of magnesium is 24.31.

The mass percentage of oxygen is 28.7%, so the mass of oxygen in 100 grams of ordinary matter is 28.7 grams.

The mass percentage of magnesium is 15.4%, so the mass of magnesium in 100 grams of ordinary matter is 15.4 grams.

The number of oxygen atoms in 28.7 grams of oxygen is (28.7 g / 16 g/mol) = 1.79 moles of oxygen.

The number of magnesium atoms in 15.4 grams of magnesium is (15.4 g / 24.31 g/mol) = 0.634 moles of magnesium.

The ratio of the number of oxygen atoms to the number of magnesium atoms: \(\rm \dfrac {(1.79 \ moles\ of \ oxygen)} { (0.634\ moles \ of \ magnesium) }\)

= 2.82

Therefore, the estimated ratio of the number of oxygen atoms to the number of magnesium atoms on earth is option a. 2.82.

Learn more about matter here:

https://brainly.com/question/6966886

#SPJ12

Your question is incomplete but most probably your full question was:

Oxygen is estimated to make up 28.7% of the mass of ordinary matter on earth, while magnesium makes up 15.4%. estimate the ratio of the number of oxygen atoms to the number of magnesium atoms on earth.

a. 2.82

b. 2.88

c. 3.22

d. 2.73

A chemical process that destroys most, but not necessarily all, harmful organisms on environmental surfaces is disinfection.

Pathogenic and other sorts of microbes are destroyed using heat or chemicals. Because treatment eliminates the majority of known pathogenic microorganisms but just not necessarily all microbial forms, disinfection was much less lethal that sterilization (e.g., bacterial spores).

standard household bleach the steam autoclave. The most desired and widely used physical sterilization technique resembles a pressure cooker. Sterilization. eliminates all living things on a surface totally.

Therefore, a chemical process that destroys most, but not necessarily all, harmful organisms on environmental surfaces is disinfection.

To know more about chemical process

https://brainly.com/question/14787457

#SPJ4

1. Some reactions will present an actual yield lower than the theoretical yield, and this can occur due to many situations, a couple of the reasons why that we can list is that some reactions don't have the reactants actually reacting to form the products, and another reason why is the loss of reactants in the process for many possible situations.

4. According to the solubility curve, if we have 30 grams of NH4Cl at 50°C, the reaction will be unsaturated

Answer:  low - pressure system and a cold weather front

Explanation: because if you look at the map on where the black arrow is pointing you will see blue triangles that indicates a cold front and you will also notice that there is a big red L that L means low pressure, therefore the answer is low - pressure system and a cold weather front. please correct me if i'm wrong. ( i also just finished this same TGA in k12 and this was the answer)

i really hope this helps and have a great day.

A weather map, commonly referred to as a synoptic weather chart, shows different meteorological features across a certain area at a particular time and contains different symbols with different meanings.

The Weather Map is a weather forecaster's fundamental tool. The distribution patterns of atmospheric pressure, wind, temperature, and humidity at various levels of the atmosphere are shown on the weather map.

To know more about Weather map please click here ; https://brainly.com/question/26255452

#SPJ1

Rutherford's model of the atom differed significantly from earlier models, such as Dalton's atomic theory. Here are some of the key differences:

Structure of the atom: Dalton's atomic theory proposed that atoms were indivisible, solid spheres. In contrast, Rutherford's model suggested that atoms had a complex structure consisting of a dense, positively charged nucleus at the center, surrounded by negatively charged electrons orbiting around it.

Charge of the nucleus: Dalton's model had no concept of a nucleus, so it did not address the charge of the center of the atom. Rutherford's model, on the other hand, proposed that the nucleus had a positive charge, which was responsible for the electrostatic attraction that kept the negatively charged electrons in orbit.

Size of the atom: Dalton's model did not propose a specific size for atoms. Rutherford's model, however, suggested that atoms were much smaller than previously believed, with most of the mass concentrated in the nucleus, which was thousands of times smaller than the overall size of the atom.

Experimental evidence: Rutherford's model was based on experimental evidence from his famous gold foil experiment, in which he shot alpha particles at a thin sheet of gold foil and observed how they were deflected. This provided direct evidence for the existence of a small, positively charged nucleus at the center of the atom. In contrast, Dalton's model was based more on theoretical considerations and did not rely as heavily on experimental evidence.

Rutherford's model of the atom differed from Dalton's model in several key ways, including its proposed structure, charge, size, and the experimental evidence used to support it. Rutherford's model represented a major advance in our understanding of the atom and provided a framework for later developments in atomic theory.

Learn more about atomic model here: brainly.com/question/28825274

#SPJ4

One difference between a reflux setup and a simple distillation setup is the presence of a T-shaped three-way adapter positioned between the reaction pot and the condenser.
In the reflux setup, the condenser is mounted directly on the reaction flask.

The purpose of the reflux setup is to maintain the solvent in the reaction flask at boiling point while maintaining a constant volume of it. It is assumed that the boiling point of the solvent is known, so no thermometer is necessary.
On the other hand, the purpose of the distillation setup is to separate the liquid components of the mixture based on the difference in their boiling points. Because of this, we need to be able to gauge the temperature of the vapors entering the condenser, making the thermometer (and the T-shaped three-way adapter) necessary.

You can learn more about distillations here:
brainly.com/question/13345735

#SPJ4

Explanation:

molarity = no. of moles of solute/solution in litres

molarity =0.202/7.98

=0.025 M

Two possible sources of systematic (determinate) error in the experiment are; Incorrect calibration of volumetric glasswareIncorrect mass of NaCl

To calculate the concentration of NaCl in the resulting solution in mg/L NaCl, we can use the formula; Concentration (mg/L) = (Mass of solute ÷ Volume of solution in L) × 1000 g / 1 mg NaCl is present in the stock solution of 25 mL. So, the mass of NaCl in the solution would be;0.0842 g ÷ 25 mL = 0.00337 g/mL. Now, in the resulting solution, a 1.00 mL aliquot of the stock solution is transferred to a 50.00 mL volumetric flask and diluted to volume. Therefore, the volume of the resulting solution is 50.00 mL. We will substitute these values in the formula, Concentration (mg/L) = (0.00337 g/mL ÷ 50 mL) × 1000 g / 1 mg concentration (mg/L) = 67.4 mg/L. Therefore, the concentration of NaCl in the resulting solution in mg/L NaCl is 67.4 mg/L.7.  Concentration = 67.4 mg/LTolerance = 4.28 mg/LTotal concentration = 67.4 + 4.28 mg/L = 71.68 mg/LWe round off this value to one decimal place; Total concentration = 71.7 mg/LTherefore, the concentration of NaCl in the resulting solution using propagation of error through the calculation is 67.4+0.4 mg/L.8. Two possible sources of random (indeterminate) error in the experiment are; Errors in temperature measurement. Errors in measurement of water volume. Two possible sources of systematic (determinate) error in the experiment are; Incorrect calibration of volumetric glasswareIncorrect mass of NaCl.

Learn more about NaCl

https://brainly.com/question/32275922?

#SPJ11

Answer:

When you look only at the “before” and “after” of a change, you are considering it as static change. In this perspective, you look at change as a one-dimensional shift. A situation or object was one way, and now it is different because some outside force acted on it to make it change.

Explanation:

Its the def

In the correct significant figures, the solutions to the given problems are;

The term significant figures refers to the number of important single digits in the coefficient of an expression in scientific notation.

61.2 m + 9.35 m + 8.6 m = 79.15 m

9.44 m – 2.11 m = 7.33  m

1.36 m + 10.17 m = 11.53 m

34.61 m – 17.3 m = 17.31 m

Thus, in the correct significant figures, the solutions to the given problems are;

Learn more about significant figures here: https://brainly.com/question/24491627

#SPJ1

The statement that, the lower the pH, the higher the hydrogen ion concentration is true.

pH is a measure of how acidic/basic water is. The range goes from 0 - 14, with 7 being neutral. pH of less than 7 indicate acidity, whereas a pH of greater than 7 indicates a base. pH is really a measure of the relative amount of free hydrogen and hydroxyl ions in the water.

The full form of pH is “Potential of Hydrogen”. pH is known as the negative logarithm of H+ ion concentration.

pH = -log(H+)

pH scale:

0 < acid < 7 = pure water < base < 14.

To know more about the pH, here

brainly.com/question/23659500

#SPJ4

119.37 g/mol

Relative atomic mass (Ar) and relative molecular mass / molar mass (M)  

the molar mass/molecular mass of a compound : the sum of the relative atomic mass (Ar) of the constituent atoms

M AxBy = (x.Ar A + y. Ar B)  

Atomic weight (Ar) of :

The molar mass of CHCl₃

\(\tt CHCl_3=12.0107+1,00784+(35,453\times 3)=119.37~g/mol\)

The molar mass of \(CHCl_3\) (chloroform) is 119.37 g/mol. Therefore, the correct option is C.

The organic compound chloroform, which has the molecular formula \(CHCl_3\), is well known for its use as a solvent and anaesthetic. It consists of three chlorine atoms (Cl), one hydrogen atom (H), and one carbon atom (C).

The molar mass of carbon (C) is approximately 12.01 g/mol, the molar mass of hydrogen (H) is approximately 1.01 g/mol, and the molar mass of chlorine (Cl) is approximately 35.45 g/mol. We add up the molar masses of all the individual atoms to determine the molar mass of \(CHCl_3\):

(1 * molar mass of C) + (1 * molar mass of H) + (3 * molar mass of Cl)

(1 * 12.01 g/mol) + (1 * 1.01 g/mol) + (3 * 35.45 g/mol)

12.01 g/mol + 1.01 g/mol + 106.35 g/mol

The molar mass of \(CHCl_3\) is approximately 119.37 g/mol.

Therefore, the correct answer is C.

Learn more about Molar mass, here:

https://brainly.com/question/31545539

#SPJ6

The pressure within a gas container that is sealed would rise as the temperature climbed. The right answer is B.

This is easily understood by picturing how the gas particles in the container move more energetically as the temperature rises. This indicates that there are more contacts between them and the container's sidewalls, increasing the pressure.

The pressure inside a closed container of gas is brought on by collisions between the gas's particles and the container's walls. The pressure of the gas increases with the frequency of collisions.

To know more about gas visit:-

https://brainly.com/question/14812509

#SPJ1

The radiocarbon age of the deeper layer of sediment in the cave is approximately 4160 years.

This age is determined by measuring the ratio of Carbon-14 (14C) to Carbon-12 (12C). Charcoal is often used for this purpose because it is preserved for long periods of time.

The ratio of 14C to 12C is typically used to calculate the age of a sample. This is because the amount of 14C in a sample decreases over time due to radioactive decay, meaning a sample with a lower ratio of 14C to 12C has been around longer than one with a higher ratio.

In the case of the cave sample, the ratio of 14C to 12C was found to be only 15% of that of the charcoal sample from a higher level with a known age of 2540 years.

To calculate the age of the deeper layer, we need to take the known age of 2540 years and divide it by 0.15 (the ratio of the cave sample to the higher level sample). This gives us a radiocarbon age of 4160 years for the deeper layer of sediment.

Learn more about carbon age here:

https://brainly.com/question/28093520

#SPJ11

Explanation:

hope it make sense to u :)

Answer:

Again, Microscopes discovered a lot of things in biology like the prokaryotic cells, Bacteria and Archaea, aswell as parts of an organelle/cell.

Most likely, exothermic processes are what cause the light that fireflies emit. because fuel and oxygen undergo a chemical process that produces carbon dioxide and water.

In thermochemistry, an exothermic process is one "for which the overall standard enthalpy change H is negative." Exothermic processes typically result in heat. A reaction for which the overall standard Gibbs energy change G is negative is what the term "reaction" according to the IUPAC means.

The exergonic response and the phrase are commonly mistaken. A very exothermic reaction will often accompany an exergonic reaction since "H" significantly contributes to "G." The majority of the remarkable chemical reactions presented in classrooms are exothermic and exergonic processes.

On the other hand, an endothermic reaction typically produces heat and is brought on by a rise in the entropy of the system.

Learn more about fireflies:

https://brainly.com/question/29336431

#SPJ4