French scientist Antoine Lavoisier was one of the first to use an
analytical
to monitor chemical reactions.
O balance
O spectrometer
O thermometer
O chromatogram

No they are not, as climate is long term conditions for an area while weather is temporary

The pH of H2SO4 is 1.20×10–2.

We need to determine the pH of a 0.310 M solution of H2SO4.In order to find pH, we'll need to find the [H+] of the solution.

At equilibrium, the concentration of H+ will be twice that of the initial concentration of H2SO4.

Thus, [H+] = 2 × 0.310 = 0.620 M

The concentration of [SO42-] will also be 0.310 M.

Using the Ka2 expression for H2SO4 gives:

Ka2 = ([H+][SO42-])/[H2SO4]1.20 × 10-2 = (0.620 x 0.310)/[H2SO4][H2SO4] = 0.12 M

The [H+] in the solution is 2 × 0.310 = 0.620 M,

so:

pH = -log([H+]) = -log(0.620) = 0.2064 (rounded to four significant figures)pH = 0.21 (rounded to two significant figures)

Therefore, the pH of a 0.310 M solution of H2SO4 is 0.21.

learn more about pH here

https://brainly.com/question/172153

#SPJ11

Answer:

New volume of chlorine gas (V2) = 179 ml (Approx)

Explanation:

Given:

Volume of chlorine gas (V1) = 193 ml

Temperature of chlorine gas (T1) = 21°C = 21 + 273 = 294 k

New temperature of chlorine gas (T2) = 0°C = 0 + 273 = 273 k

Find:

New volume of chlorine gas (V2) = ?

Computation:

Using charle's law

V1 / T1 = V2 / T2

193 / 294 = V2 / 273

V2 = 179.21

New volume of chlorine gas (V2) = 179 ml (Approx)

The half life is the time taken for only one of the half  of the radioactive substance to remain.

The half life is the time taken for only one of the half  of the radioactive substance to remain. We can see the half life by looking at the graph and observing the point at which the sample decreases to half its original number.

Since the half life of carbon-14 is 5700 years, after ten half lives, almost 60000 years has elapsed thus there is little or no carbon-14 left. As a result of this carbon-14 can not be used if the sample is over 60000 years old.

Learn more about half life:https://brainly.com/question/24710827

#SPJ1

The mass of ammonium chloride that will be needed is 27 g.

The number of moles of ammonium nitrate in 35 g is,

n = 35 g / 80.044 g/mol

⇒ n = 0.45 mol

The change in enthalpy caused by the reaction of ammonium nitrate in water is,

ΔH = n × ΔHₓₙ

⇒ ΔH = 0.45 mol × 15.7 kJ/mol

⇒ΔH = 7.1 kJ

The number of moles of ammonium chloride required to change in enthalpy of 7.1 kJ is,

n = ΔH / ΔHₓₙ

⇒ n = 7.1 kJ / 14.8 kJ mol⁻¹

⇒ n = 0.48 mol

The molar mass of ammonium chloride is 53,49 g/mol. The mass of ammonium chloride is,

m = 0.48 mol × 53.49 g/mol

⇒ m = 27 g

Hence, the mass of ammonium chloride that will be needed is 27 g.

Learn more about molar masses from the link given below.

https://brainly.com/question/14182416

#SPJ4

The sodium-potassium ion pump found in cell membranes is made of amino acids. Option A is correct option.

The sodium-potassium ion pump is a type of integral membrane protein that actively transports sodium ions (Na+) out of the cell and potassium ions (K+) into the cell.

This pump plays a crucial role in maintaining the electrochemical gradient across the cell membrane, which is necessary for various cellular functions.

Amino acids are the building blocks of proteins, and proteins are composed of one or more polypeptide chains. The sodium-potassium ion pump is a protein, and its structure is formed by a specific arrangement of amino acids.

These amino acids contribute to the pump's ability to bind and transport sodium and potassium ions across the cell membrane.

For more question on cell membranes click on

https://brainly.com/question/4353274

#SPJ11

The major difference between heat transfer by conduction and convection and heat transfer by radiation is that heat transfer by conduction and radiation requires a material medium, while heat transfer by radiation is done by electromagnetic waves and doesn't require a medium.

Heat or thermal energy is the energy generated when atoms or molecules move in a variety of directions (translational, rotational and vibrational). The three methods of heat transfer are convection, conduction and radiation. Conduction only occurs between solid objects in contact, convection occurs within a fluid, and radiation occurs through electromagnetic waves.

Unlike conduction and convection, radiation doesn't require a material medium before heat is transferred, as electromagnetic radiations don't require a material medium to propagate. Heat is transferred by radiation through infrared rays. Other differences include:

Learn more about radiation here:

https://brainly.com/question/10219972

#SPJ4

Answer:

0.567 g/mL

Explanation:

First, we will find the mass of the liquid. Subtract the weight of the empty cylinder from the weight of the filled cylinder

110.81 - 82.45 = 28.36

The mass of the liquid is 28.36 g.

Now, we find the density by dividing the mass by volume

28.36/50 = 0.5672

The density of the unknown liquid is approximately 0.5672 grams per cubic centimeter.

Given that:

Weighs of empty graduated cylinder = 82.450 g

Mass of the graduated cylinder + unknown liquid = 110.810 g

Volume of the unknown liquid = 50.0 mL

The mass of the unknown liquid can be calculated as:

Mass of unknown liquid = Mass of graduated cylinder + unknown liquid - Initial mass of graduated cylinder

Mass of unknown liquid = 110.810 g - 82.450 g

Mass of unknown liquid = 28.360 g

The density formula can be obtained as:

\(Density = \dfrac{Mass}{Volume}\)

Substitute the values in the formula:

\(Density = \dfrac{28.360 g}{50.0 mL}\)

The volume is given in milliliters (mL)

1 mL = 1 cm³,

\(Density = \dfrac{28.360 g}{50.0 cm^3 }\)

Density = 0.5672 \(\dfrac {g}{cm^3}\)

So, the density of the unknown liquid is approximately 0.5672 grams per cubic centimeter (g/cm³).

Learn more about density here:

https://brainly.com/question/15164682

#SPJ3

Chemical symbols are used to represent elements, which are the basic building blocks of matter. These symbols can be classified into the symbolic domain.

The symbolic domain refers to the use of abstract symbols and language to represent real-world objects and concepts. In the case of chemistry, this involves the use of chemical symbols to represent elements, which are the fundamental units of matter.

Chemical symbols are shorthand representations of the names of elements. They are usually one or two letters long, and are often derived from the name of the element in some way. For example, the chemical symbol for carbon is C, which is derived from the Latin word "carbo" meaning coal.

Chemical symbols are an important part of the language of chemistry, and are used to represent elements in a wide range of contexts, from chemical equations to the periodic table of elements.

They are a fundamental tool for chemists, allowing them to communicate and work with the properties and behaviors of different elements and their combinations in a precise and efficient way.

to know more about chemical symbols refer here

https://brainly.com/question/9249660#

#SPJ11

Answer:

to remember when balancing nuclear equations: 1. The total of the superscripts (mass numbers, ) in the reactants and products must be the same. 2. The total of the subscripts (atomic numbers, ) in the reactants and products must be the same P a r t A What is the value of in the following nuclear reaction?

When you balance an equation you can only change the coefficients (the numbers in front of molecules or atoms). Coefficients are the numbers in front of the molecule. Subscripts are the smaller numbers found after atoms. These cannot be changed when balancing chemical equations! Subscripts are the smaller numbers found after atoms.

Balanced chemical equations have the same number and type of each atom on both sides of the equation. The coefficients in a balanced equation must be the simplest whole number ratio. Mass is always conserved in chemical reactions.

Keeping this in view, what is meant by a balanced equation? A balanced equation is an equation for a chemical reaction in which the number of atoms for each element in the reaction and the total charge is the same for both the reactants and the products. Also Known As: Balancing the equation, balancing the reaction, conservation of charge and mass.

Explanation:

Answer:

0.24%

Explanation:

The following data were obtained from the question:

Measured value = 42.1 g

Actual value = 42 g

Percentage error =?

Percentage error can be obtained by using the following formula:

Percentage error = |Measured value – Actual value | / Actual value × 100

With the above formula, we can obtain the percentage error as follow:

Measured value = 42.1 g

Actual value = 42 g

Percentage error =?

Percentage error = |42.1 – 42| / 42 × 100

Percentage error = 0.1/42 × 100

Percentage error = 10/42

Percentage error = 0.24%

Therefore, the percentage error is 0.24%

The concept of energy balance refers to the equilibrium between the energy input into a system and the energy output from that system. It is based on the principle of conservation of energy, which states that energy cannot be created or destroyed but can only be transferred or transformed from one form to another.

In terms of human energy balance, it involves the energy intake from food and beverages (energy in) and the energy expenditure through basal metabolic rate, physical activity, and other bodily processes (energy out). When the energy intake matches the energy expenditure, there is an energy balance. However, when there is an imbalance, either an excess or deficit of energy, it can lead to weight gain or weight loss, respectively.

For example, if a person consumes 2000 calories (energy in) through their diet and expends 2000 calories (energy out) through their daily activities and bodily functions, they maintain an energy balance. This means that the energy intake is equal to the energy expenditure, and their weight remains stable.

On the other hand, if a person consumes 2500 calories (energy in) but only expends 2000 calories (energy out), there is a positive energy balance. The excess energy is stored in the body as fat, leading to weight gain over time.

Conversely, if a person consumes 1500 calories (energy in) but expends 2000 calories (energy out), there is a negative energy balance. The body needs to compensate for the energy deficit by utilizing stored energy reserves, such as fat, resulting in weight loss.

Support for the concept of energy balance comes from scientific studies on weight management and obesity. It has been shown that maintaining an energy balance is crucial for weight maintenance, while sustained positive or negative energy balances can lead to weight changes. Additionally, energy balance plays a role in various physiological processes, including metabolism, hormone regulation, and overall health.

By understanding and managing energy balance, individuals can make informed decisions regarding their diet, physical activity, and lifestyle to achieve and maintain a healthy weight and overall well-being.

To know more about energy balance, click here, https://brainly.com/question/31922451

#SPJ11

To determine the vapor pressure of a solution at 25°C containing 76.6 g of glucose, we need to know additional information such as the solvent used and the concentration of the glucose solution. The vapor pressure of a solution is influenced by the solvent properties and the concentration of the solute.

Assuming we have a glucose solution in water, we can use the concept of molality to calculate the vapor pressure. Molality is the number of moles of solute per kilogram of solvent.

Here are the steps to calculate the vapor pressure of the glucose solution:

1. Calculate the number of moles of glucose:

To do this, divide the mass of glucose by its molar mass. The molar mass of glucose (C6H12O6) is approximately 180.16 g/mol.

Number of moles of glucose = mass of glucose / molar mass of glucose

Number of moles of glucose = 76.6 g / 180.16 g/mol

2. Determine the molality of the solution:

Molality (m) is the number of moles of solute per kilogram of solvent. In this case, the solvent is water.

Molality = moles of solute / mass of solvent (in kg)

Since we don't have the mass of the water, we cannot calculate the molality or the vapor pressure without that information.

To determine the vapor pressure of the solution, we need to know the concentration of the solution or have the mass of the solvent (water) available.

To know more about vapor pressure, refer here :

https://brainly.com/question/29640321#

#SPJ11

One mole of gas takes up 22.4 liters of volume at STP (standard temperature and pressure). As a result, by dividing the volume of gas created by the number of moles of gas.

the experimental molar volume of the gas may be calculated Volume of gas / Number of moles of gas = experimental molar volume 112 L / 5.25 mol = experimental molar volume 21.33 L/mol experimental molar volume (rounded to two decimal places) As a result, the gas's experimental molar volume is roughly 21.33 L/mol. One mole of gas takes up 22.4 liters of volume at STP (standard temperature and pressure). As a result, by dividing the volume of gas created by the number of moles of gas.

learn more about  gas  here:

https://brainly.com/question/3637358

#SPJ4

Asexual reproduction results in two organisms with the same parent and the same DNA.

Asexual reproduction produces offspring which are genetically identical to the parent because the offspring are all clones, that is, identical copies of the original parent.

Asexual reproduction in animals occurs through various process such as fission, fragmentation, budding and parthenogenesis. A single individual can produce offspring asexually and large numbers of offspring can be produced quickly with asexual reproduction.

A new potato growing from an old potato can be an example of asexual reproduction. Variation is not possible or significantly reduced in asexual reproduction. Asexual reproduction results in offspring with the same combination of genetic information as the parents.

To learn more about asexual reproduction,

brainly.com/question/18575016

#SPJ1

Answer: carbon atoms

Explanation:

carbon atoms because carbon has an atomic mass of 12. Atomic mass is the mass of an atom. It is calculated as the sum of the number of protons and neutrons in the atom, because protons and neutrons make up the majority of the atom's mass.

1.84 x 10^(-9) g (or 1.84 ng) of NaOH to give a pH of 11.5 in a 14.5 L tank of water.

To find the mass of NaOH needed to give a pH of 11.5 in 14.5 L of water, we first need to calculate the concentration of hydroxide ions (OH-) required to achieve that pH.

The pH of a solution is defined as the negative logarithm of the hydrogen ion (H+) concentration, so we can write:

\(pH = -log[H+]\)

We can rearrange this equation to solve for [H+]:

\([H+] = 10^(-pH)For a pH of 11.5, we have:[H+] = 10^(-11.5) = 3.16* 10^(-12) M\)

Since NaOH is a strong base that completely dissociates in water, we know that the concentration of hydroxide ions will be the same as the concentration of NaOH we add.

Therefore, we can calculate the amount of NaOH needed using the following equation:

\(moles of NaOH = volume of water (in L) * desired [OH-] concentration (in M)moles of NaOH = 14.5 L * 3.16 * 10^(-12) M = 4.59 * 10^(-11) mol\)

Finally, we can convert moles of NaOH to grams using the molar mass of NaOH:

\(mass of NaOH = moles of NaOH * molar mass of NaOHmass of NaOH = 4.59 x 10^(-11) mol* 40 g/mol = 1.84 * 10^(-9) g\)

Therefore, we need 1.84 x 10^(-9) g (or 1.84 ng) of NaOH to give a pH of 11.5 in a 14.5 L tank of water.

Learn more about Mass of NaOH

brainly.com/question/1416379

#SPJ11

The total mass of 4 tin is in grams is 580 grams and in kg is 0.58kg.

One tin of chopped tomatoes weight is 145 grams

and we have to calculate it for 4

so for 4

145*4 =580 grams

and we have to change it into kilograms so

580 /1000  = .58kg

By 1,000, divide the number of grams.

To convert from grams to kilograms, simply divide by 1,000 because there are 1,000 grams in every kilogram. If necessary, construct the equation using fractions. Put the number of grams over 1 and divide it by the conversion factor, which is 1 kg / 1,000 g. Your answer in kilograms will result from the cancellation of the grams. Remember to use the appropriate units to mark your response.

know more about grams to kilograms click here;

https://brainly.com/question/12065899

Answer:

D

Explanation:

In the periodic table the noble gases are place in same column because the valence electron configuration is similar in all noble gas elements. Thus option D is correct.

A periodic table is defined as an organization of all known elements in increasing atomic number and repeating chemical properties.

It can also be defined as a tabular arrangement of chemical elements ordered by increasing atomic number and element groups.

There are more than 118 elements are arranged in modern periodic table.

Noble gases are defined as any of a class of rare gases that includes helium, neon, argon, krypton, xenon, and, most commonly, radon and display high stability and extremely low reaction rates.

Electronic configuration are defined as the electron configuration around the nucleus of a specific atom or molecule.

Thus, in the periodic table the noble gases are place in same column because the valence electron configuration is similar in all noble gas elements. Thus option D is correct.

To learn more about periodic table, refer to the link below:

https://brainly.com/question/11155928

#SPJ5

Answer:

10⁻³⁶ s

Explanation:

There is much speculation, but many scientists believe the universe started expanding about 10⁻³⁶ s  after the Big Bang.

We must apply the formula that links a material's density to its atomic weight and unit cell dimensions in order to resolve this issue.





The density of a face-centered cubic lattice is given by: density is equal to (Z M) / (a3 Na).Z stands for the quantity of atoms perunit cell, M for the substance's molar mass, a for the lattice parameter, or the length of a cube's edge, and Na for Avogadro's number.Since KCl has a face-centered cubic unit cell in this instance, each unit cell contains 4 Cl- ions (corners) and 4 Cl- ions (face centres). Avogadro's number is 6.022 1023 mol-1, while the molar mass of KCl is 74.55 g/mol. So, here we are:We must apply the formula that links a material's density to its atomic weight and unit cell dimensions in order to resolve this issue. The density of a face-centered cubic lattice is given by density is equal to (Z M) / (a3 Na).Z stands for the quantity of atoms per unit cell, M for the substance's molar mass, a for the lattice parameter, or the length of a cube's edge, and Na for Avogadro's number.To solve for a, we obtain:an is equal to [(Z M) / density Na]^(1/3)The formula for an is [(8 74.55 g/mol) / (1.984 g/cm3 6.022 1023 mol1)]^(1/3)A = 6.289 ÅWe can use the correlation between the radius of an octahedral hole and the radius of the K+ ion to explain why the K+ ion occupies the octahedral hole between adjacent Cl- ions.



learn more about issue here :



https://brainly.com/question/29869616



#SPJ11

Answer:

The answer is B. Urine, Feces

Explanation:

Answer:

b.urine ,feces

.................

3 moles⋅22.4 L/1 mole=67.2 L Likewise, 0.5 moles of gas will occupy half the volume 1 mole occupies 0.5 moles⋅22.4 L/1 mole = 11.2 L

Standard Temperature and Pressure conditions imply a temperature of 273.15 K and a pressure of 1 atm. When these conditions are met, 1 mole of any ideal gas occupies exactly 22.4 L. Keep in mind that ideal gas particles are assumed to have no volume of their own, that's why, for example, at STP 1 mole of helium gas will occupy the same volume as, say, 1 mole of chlorine gas.

However, as you can see in the picture, the two gases will have different masses because of the difference in their molar mass. The balloon filled with helium will weigh less than the one filled with chlorine, despite the fact that they occupy the same volume.

So, if 1 mole occupies 22.4 L, the immediate conclusion is that a bigger number of moles will occupy more than 22.4 L, and a smaller number of moles will occupy less than 22.4 L.

In your case, 3 moles of gas will occupy 3 times more volume than 1 mole of gas.

3 moles⋅ 22.4 L/1 mole=67.2 L

Likewise, 0.5 moles will occupy half the volume 1 mole occupies

0.5 moles⋅ 22.4 L/1 mole=11.2 L

Learn more about gas here: https://brainly.com/question/29197891

#SPJ4

Answer:because they run out of energy when it is transferred and to other objects, or their kinetic energy

Explanation:

During hybridization in a CH₄ molecule, the valence electrons of the carbon atom are equally allotted to the hybrid orbitals. Option B is correct.

In hybridization, atomic orbitals from the same atom, usually s and p orbitals, combine to form a set of new hybrid orbitals that are equivalent in energy and symmetry. These hybrid orbitals then participate in bonding with other atoms to form covalent bonds.

In CH₄ molecule, carbon atom undergoes sp₃ hybridization, which means that one 2s and three 2p orbitals of carbon combine to form four new hybrid orbitals called sp₃ hybrid orbitals. The four hydrogen atoms then bond with these sp₃ hybrid orbitals to form four identical C-H bonds.

In this process, the valence electrons of the carbon atom are evenly distributed among the four sp₃ hybrid orbitals.

Hence, B. is the correct option.

To know more about hybridization here

https://brainly.com/question/14140731

#SPJ4

--The given question is incomplete, the complete question is

"Which statement best describes what occurs to the valence electrons in a CH₄ molecule during hybridization? select the correct answer below:  A) the valence electrons of the carbon atom are unequally allotted to the hybrid orbitals. B) the valence electrons of the carbon atom are equally allotted to the hybrid orbitals. C) the valence electrons of the carbon atom do not change in energy. D) the valence electrons of the carbon atom are distributed to the sp₃ orbitals, except for one electron which remains in the 2p orbital."--

There are two molecular orbitals are needed to form one bonding molecular orbital and one anti-bonding molecular orbital.

Bond orbitals Electrons that spend most of their time between the nuclei of two atoms are placed in bonding orbitals, and electrons that spend most of their time outside the nuclei of two atoms are placed in anti-bonding orbitals.

Adding up the same number of atomic orbitals gives the same number of molecular orbitals. Two atomic orbitals combine to form two molecular orbitals. An anti-bonding orbital is essentially the opposite of a bonding orbital. They form when atomic orbitals combine in ways that lead to almost destructive interference.

Learn more about Atomic orbitals here:- https://brainly.com/question/20319149

#SPJ4

To recover the benzoic acid, collect the bottom layer, dry it with \(Na_{2} SO_{4}\), filter to remove \(Na_{2} SO_{4}\), and evaporate the solvent. The option 4  is correct.

This is because benzoic acid is a carboxylic acid and will react with the basic aqueous solution to form a water-soluble carboxylate salt. As a result, benzoic acid will be in the aqueous layer, which is the bottom layer. Ethyl acetate is the organic solvent and will form the top layer. By collecting the bottom aqueous layer, we can isolate the benzoic acid. Drying the solution with \(Na_{2} SO_{4}\) removes any remaining water, and evaporating the solvent leaves behind the solid benzoic acid. Option 4 is correct answer.

To know more about benzoic acid, here

brainly.com/question/24052816

#SPJ4

--The complete Question is, you are separating anthracene from benzoic acid via an extraction between ethyl acetate and a basic aqueous solution in a separatory funnel. how would you recover the benzoic acid? group of answer choices

1.  collect the top layer, dry with na2so4,

2. filter to remove the na2so4, and evaporate the solvent.

3. collect the bottom layer, dry with na2so4,

4.  collect the bottom layer and add hcl to precipitate the compound.

5. collect the top layer and add hcl to precitipate the compound.  --

Answer:

1. The methods used for the separation were filtration and evaporation

Explanation:

The mixture of table salt and sand is first dissolved in distilled water. The salt is soluble in water but the sand is not. The solution is now filtered. The filtrate contains the salt solution while the residue is the sand. The filtrate is now evaporated to dryness to recover the table salt from solution.

From the experiment we can clearly see that table salt is highly soluble in water.

One precaution during the experiment is to ensure that the filter paper was placed correctly before filtration started.

To determine the number of moles of oxygen in methyl tert-butyl ether (MTBE), we need to consider the molecular formula and the molar ratios of the elements. The molecular formula of MTBE is CH3OC(CH3)3. From the formula, we can see that for each molecule of MTBE, there is one oxygen atom.

Given that there are 67 moles of hydrogen in the sample, we know that the mole ratio of hydrogen to oxygen is 3:1 according to the formula. So, for every 3 moles of hydrogen, there must be 1 mole of oxygen. Therefore, the number of moles of oxygen in the sample is 67 moles / 3 = 22.33 moles. Rounding to 2 significant digits, the number of moles of oxygen in the sample of methyl tert-butyl ether is 22.33 moles.

Learn more about molecular formula here: brainly.com/question/31786544

#SPJ11