2.How could you identify an element by its
number of protons?

You could form approximately 5.8 grams of methanol (CH3OH) from the given gas mixture at STP.

Using the Ideal gas equation;

n = PV / RT

n = (1 atm * 7.82 L) / (0.0821 L·atm/(mol·K) * 273.15 K)

From the question;

nCO = n / 2

nH2 = n / 2

Then;

n = (1 atm * 7.82 L) / (0.0821 L·atm/(mol·K) * 273.15 K)

n = 0.362 mol

nCO = n / 2 = 0.362 mol / 2 = 0.181 mol

nH2 = n / 2 = 0.362 mol / 2 = 0.181 mol

By stoichiometry;

methanol= nCO = 0.181 mol

Mass of methanol =  0.181 mol * 32.04 g/mol

= 5.8 g

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The chemical formula of aspartame is C₁₄H₁₈N₂O₅ and it's relative molecular mass is 294.30 g/mol which is calculated as (12×14)+(1×18)+(14×2)+(16×5).

Molecular  mass of a compound or a molecule is defined as the mass of the elements which are present in it.The molecular mass is considered to be a bulk quantity not a molecular quantity. It is often an average of the of the masses at many instances.

The molar mass and formula mass are used as synonym for the molecular mass.It does not depend on the amount of substance which is present in the sample.It has units of gram/mole.

Molecular masses of an element are given as relative atomic masses while that of compounds is the sum of relative atomic masses which are present in the compound.In case of aspartame it is calculated as,(12×14)+(1×18)+(14×2)+(16×5)=294.30 g/mol.

Thus , relative molecular mass or molecular mass of aspartame is 294.30 g/mol.

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Answer:

constructed as a cylindrical container for the battery cell, and a carbon rod surrounded by a compound with a higher Standard electrode potential (positive polarity), known as the cathode, that collects the current from the manganese dioxide electrode

Explanation:

is this what you are talking about?

Answer:

3

Explanation:

Important concept! The little number after an element represents the number of atoms in the substance. Eg. SF6. The 6 after the F tell us that there are 6 atoms of Fluorine in SF6. The coefficient or big number before a substance tells us how many of that substance there is in the equation. TO find the number of atoms in a substance with a coefficient we simply multiply the coefficient by the subscript or small number. Eg. 4SF6. The number of fluorine atoms in 4SF6 can be found my multiplying 4 and 6. 4 * 6 = 24 so there are 24 atoms of fluorine in 4SF6

Balancing the equation!

First lets list the number of atoms of each element on each side so we can see what we need to balance

SF6 + SO3 --> O2SF2

               2  S   1

               6  F  2

               3  O  2

First lets balance the number of oxygen atoms. We can do this by adding a coefficient of 2 to SO3 and a 3 to O2SF2. After doing so lets count the number of atoms of each element again as some of them may have changed.

SF6 + 2SO3 --> 3O2SF2

                3  S   3

                6  F  6

                6  O  6                

It appears that the each element in the reaction is now balanced after adding a 2 to SO3 and a 3 to O2SF2 so the equation is now balanced.

The answer would be 3 as 3 was added to O2SF2 to balance the reaction.

Answer:

72.2222

Explanation:

Global warming is a phenomenon that has become an increasing concern worldwide.

The increase in Earth's average surface temperature due to rising levels of greenhouse gases, particularly carbon dioxide, in the atmosphere is referred to as global warming.

It is most closely associated with climate change.

It is a long-term trend that has become one of the most pressing environmental problems facing our planet today.

The primary cause of global warming is human activity.

Human beings are responsible for releasing large amounts of carbon dioxide, methane, and other greenhouse gases into the atmosphere through the burning of fossil fuels such as coal, oil, and natural gas.

These gases trap heat from the sun's rays and cause the Earth's temperature to rise, leading to global warming.

The effects of global warming can be seen in rising sea levels, more frequent and severe weather events such as hurricanes, droughts, and floods, and the melting of ice caps and glaciers.

It is also having a significant impact on the world's ecosystems, with changes in temperature and precipitation patterns affecting the distribution and abundance of plant and animal species.

Although global warming is a serious issue, there are ways to reduce its impact.

Reducing our dependence on fossil fuels by transitioning to renewable energy sources such as wind and solar power can help to reduce greenhouse gas emissions.

Additionally, planting trees and other vegetation can help to absorb carbon dioxide from the atmosphere and store it in the ground. Education and awareness-raising can also help individuals and communities take action to mitigate the effects of global warming.

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The first undiscovered remedy is barium chloride.

Option b is correct.

Explanation and Response: The flame of potassium, often known as a lilac flame, is violet or light purple in color. Remember that different elements can create similar colors, thus flame tests are not always reliable.

Avoid contact with mucous membranes, eyes, and skin as copper(II) chloride is mildly poisonous. Body tissue irritant lithium chloride is used. In order to prevent trashcan fires, rinse the wooden splints before throwing them in the trash. Put on chemical-resistant gloves, an apron, splash goggles, and other protective gear.

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Answer:

A. Whatever is in the water, it moves. Even if a block is placed in there, it would move by sinking to the bottom. If a plastic bag was placed in there, it wouldn't sink but move a little.

Answer:

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

\(n = \frac{N}{L} \\\)

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

\(n = \frac{8.72 \times {10}^{24} }{6.02 \times {10}^{23} } \\ = 14.48504...\)

We have the final answer as

Hope this helps you

The value of ΔG° for the reaction CO(g) + H₂O(g) ⇄ CO₂(g) + H₂(g), when ΔH° = -41.0 kJ/mol and ΔS° = -42.3 J/K*mol, at 25.0°C and 1 atm, is -28.40 kJ/mol.

The reaction is:

CO(g) + H₂O(g) ⇄ CO₂(g) + H₂(g)    (1)

Gibbs free energy for reaction (1) is given by:

\( \Delta G^{\circ} = \Delta H^{\circ} - T\Delta S^{\circ} \)

Where:

ΔH°: is the enthalpy of the reaction = -41.0 kJ/mol

ΔS°: is the entropy of the reaction = -42.3 J/K*mol

T: is the temperature = 25.0 °C = 298 K

The value of ΔG° is:

\( \Delta G^{\circ} = \Delta H^{\circ} - T\Delta S^{\circ} = -41.0 kJ/mol - 298 K(-42.3 \frac{J}{K*mol}*\frac{1 kJ}{1000 J}) = -28.40 kJ/mol \)

Therefore, the value of ΔG° is -28.40 kJ/mol.

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I hope it helps you!

Answer:

I think the answer is A

Explanation:

the temperature of solids , liquids and gases can be easily measured

Answer:

true

Explanation:

Explanation:

1

Number of nucleon =

Molarmassofnucleon

Massofatom

=

1.6726×10

−24

g/nucleon

3.32×10

−23

g

=19.8=20(approximately)

It is given that element comprises of 2 atoms

Hence,number of nucleon = 2×20=40

2

You have 4.70 mol H2O

There are two H atoms in 1 molecule H2O.

Therefore, there must be 2*4.70 = 9.40 mols H in 4.70 mols H2O.

How many mols O in 4.70 mols H2O? That's 4.70 mols, of course.

Said another way, you have 2 mols H for every 1 mol H2O and 1 mol O for every 1 mol H2O.

So for 50 mols H2O you have 100 mols H and 50 mol O.

Water molecules did not have a slight negative charge on one end and a slight positive charge on another, the loss of polarity would have profound effects on various biological, chemical, and physical processes. The unique properties of water that are vital for life as we know it would be significantly altered, potentially rendering many biological systems nonfunctional and disrupting the stability of ecosystems.

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The properties of a natural resource that make it useful for humans as a material or energy source is the ability to convert mass into energy and vice versa.

The expression natural resources make reference to all types of matter and energy extracted from nature that can be used to produce goods and services.

Some examples of natural resources include for example irreversible resources such as fossil fuels (i.e., oil, or coal, gas, minerals such as metals, rocks, etc) as well as those based on the use of reversible energy such as eolic air energy, solar radiation or sunlight, soil and hydric resources or water.

Therefore, with this data, we can see that natural resources can be defined as any material and or energy obtained from nature that may be irreversible or reversibly used to produce goods and services.

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Explanation:

We have to find the empirical formula for sulfur dioxide. The compound contains two elements: Sulfur and oxygen.

As it name says, it is a dioxide, it means that one molecule of the compound contains two atoms of O.

The empirical formula of sulfur dioxide is: SO₂.

Answer: d. SO₂.

An error during DNA replication would create a gene mutation.

During DNA replication, the genetic information in a cell is copied to make new DNA molecules. However, mistakes can occur during this process, leading to changes in the DNA sequence, which can result in a mutation. Mutations can also be caused by exposure to environmental factors, such as radiation or chemicals, which can damage the DNA molecule directly or affect the cellular processes involved in DNA replication.

Mutations can have a variety of effects on the organism, ranging from no effect to causing serious health problems or even death. Gene mutations can also be inherited from a parent, which can result in genetic disorders or predisposition to certain diseases. Therefore, it is important to understand the mechanisms of gene mutations and their potential impacts on organisms.

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Cations are positively charged ions that have fewer electrons than protons. Anions are negatively charged ions that have more electrons than protons. Mg2+ is a cation, and Cl- is an anion.

Cations are ions that have a positive charge. They are formed when an atom loses one or more electrons. Cations have fewer electrons than protons, resulting in a net positive charge. Some common characteristics of cations include:

- They are positively charged.

- They have more protons than electrons.

- They are typically formed by metals.

- They tend to be located in the left side of the periodic table.

In this case, Mg2+ is a cation. Magnesium (Mg) is a metal, and when it loses two electrons, it forms the Mg2+ cation. The loss of electrons gives it a net positive charge.

Anions, on the other hand, are ions that have a negative charge. They are formed when an atom gains one or more electrons. Anions have more electrons than protons, resulting in a net negative charge. Some common characteristics of anions include:

- They are negatively charged.

- They have more electrons than protons.

- They are typically formed by nonmetals.

- They tend to be located on the right side of the periodic table.

In this case, Cl- is an anion. Chlorine (Cl) is a nonmetal, and when it gains one electron, it forms the Cl- anion. The gain of an electron gives it a net negative charge.

To summarize, cations are positively charged ions that have fewer electrons than protons, tend to be formed by metals, and are located on the left side of the periodic table. Anions are negatively charged ions that have more electrons than protons, tend to be formed by nonmetals, and are located on the right side of the periodic table. Mg2+ is a cation, and Cl- is an anion.

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Answer:

a. 4166,67 b. 74553.0

Explanation:

The empirical formula for a compound that contains 48.6%C, 8.2% H, and 43.2% S by mass is \(C_3H_6S\).

An empirical formula tells us the relative ratios of different atoms in a compound.

We need to calculate the number of moles

Number of a mole of carbon =

48.6 g X (\(\frac{1 mole }{ 12.0107 g}\)) =4.05 mole

Number of a mole of hydrogen =

8.2g X (\(\frac{1 mole}{.00784g}\)) =8.14 mole

Number of moles of sulphur =

43.2g X (\(\frac{ mole}{32.065g}\)) = 1.35 mole

Dividing each mole using the smallest number that is divided by 1.35 moles.

Carbon= \(\frac{4.05 mole }{1.35 mole}\) =3

Oxygen= \(\frac{8.14 mole}{1.35 mole}\) =6

Sulfur= \(\frac{1.35 mole}{1.35 mole}\) =1

Empirical formula is \(C_3H_6S\)

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Answer:

66 grams of ice would have to melt to lower the temperature of 352 mL of water from 15 °C to 0 °C.

Explanation:

To calculate the amount of ice that would have to melt to lower the temperature of 352 mL of water from 15 °C to 0 °C, we need to use the formula:

Q = m_water * c_water * ΔT_water + m_ice * Lf

where,
Q = the amount of heat transferred,
m_water = the mass of water, c_water is the specific heat capacity of water,
ΔT_water = the change in temperature of water, m_ice = the mass of ice,
Lf = the specific latent heat of fusion of ice.

First, let's calculate the amount of heat transferred to the water:

Q = m_water * c_water * ΔT_water
Q = 352 g * 1.0 cal/(g*°C) * (15-0) °C
Q = 5,280 cal

Next, we can use the specific latent heat of fusion of ice, which is 80 cal/g, to calculate the amount of heat required to melt the ice:

Q = m_ice * Lf
Q = m_ice * 80 cal/g
m_ice = Q / Lf
m_ice = 5,280 cal / 80 cal/g
m_ice = 66 g

Answer:

64.3 kilograms = 64300000 milligrams

Hope this helps :)

Answer:

Therefore, the correct answer is:Complex I (NADH-ubiquinone oxidoreductase)Complex II (succinate-ubiquinone oxidoreductase)Complex III (ubiquinol-cytochrome c reductase)Complex IV (cytochrome c oxidase)

Explanation:

Coenzyme Q (also known as ubiquinone) carries electrons between the stages of the electron transport chain in which it is found. In general, coenzyme Q is found in the following stages:Complex I (NADH-ubiquinone oxidoreductase): Coenzyme Q carries electrons from NADH to complex I.Complex III (ubiquinol-cytochrome c reductase): Coenzyme Q carries electrons from complex II (succinate-ubiquinone oxidoreductase) to complex III.Complex IV (cytochrome c oxidase): Coenzyme Q carries electrons from complex III to complex IV.

Answer:

Sometimes, it can be difficult to tell if a chemical or physical change is taking place. In the video, Dr. Jeff and the team explore a few different reactions to determine if they are chemical or physical changes, by figuring out if the material made after the reaction was present before the reaction. Chopping a banana.

Explanation:

The molarity of the NiSO₄ solution made by dissolving 38.81 grams of nickel (ii) sulfate, NiSO₄, in enough water to make 0.467 liters of solution is 0.535 M

First, we shall obtain the mole of 38.81 grams of nickel (ii) sulfate, NiSO₄. Details below:

Mole of NiSO₄ = mass / molar mass

= 38.81 / 154.75

= 0.25 mole

Now, we shall determine the molarity of the solution. Details below:

Molarity of solution = mole / volume

= 0.25 / 0.467

= 0.535 M

Thus, the molarity of the solution is 0.535 M

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Answer: the answer is A.

Explanation:

Bailee explained that when traveling to the moon  mass of the objects is which changes when the gravitational pull changes. Bailee is incorrect. Both the mass and weight will change. Option C is correct.

Mass is the physical quantity of any substance or object and weight is the measurement of amount of force acting on a particulate body of the mass.

At the moon both the  mass and weight is divided by 6 means the  mass and weight is six times lighter then the expected  mass and weight on earth.

Therefore, Bailee is incorrect. Both the mass and weight will change. Option C is correct. which changes when the gravitational pull changes

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Answer:

Taxonomy

Explanation: