At STP, 2.24 L of carbon dioxide gas is collected. What is the number of molecules of gas present in this volume?
a. 6.02 × 1022
c. 1.24 × 1024
e. 3.62 × 1024
b. 6.02 × 1023
d. 1.81 × 1024

Gloves is the tool component which will unlikely present a hazard in this scenario.

This is referred to as potential source of harm when performing various types of activities.

Gloves will unlikely cause harm as it is used to prevent the risk of electric shock when handling electrical devices which is why it is the most appropriate choice.

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They are forms of water in its liquid state at ground level. Thus, the correct option is A.

Precipitation, or water in the atmosphere, forms hail. When water drops freeze together in the chilly higher parts of thunderstorm clouds, hail is the result.

When a water droplet is lifted by an updraft from a thunderstorm over the freezing point of the atmosphere, hail is created. The super-cooled water or water vapor that the frozen water droplet accretes later freezes when it comes into touch with it. A hailstone grows as a result of this process.

When water vapor from the atmosphere condenses into liquid water droplets, they become heavy enough to fall as a result of gravity.

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Answer:A

Explanation:

.

Answer: A. Simple structure, molecule, single bonds, two elements

Gas law refers to the relationship between the temperature, volume and pressure of a gas.

The term gas law refers to the relationship between the temperature, volume and pressure of a gas.

6a) PV =nRT

P = nRT/V

P =  0.898 * 0.082 * 293/24.5

P = 0.88 atm

6b)  Number of  moles of helium = 2.82 g/4 g/mol = 0.705 moles

Pressure =  991 mm Hg or 1.3 atm

V = nRT/P

V = 0.705 * 0.082 * 300/1.3

V = 13.3 L

8a) V = nRT/P

V = 0.814 * 0.082 * 273/1

V = 18.22 L

8b) 1 mole of oxygen occupies 22.4 L

1.21 mole of oxygen occupies   1.21 mole *  22.4 L/ 1 mole

= 27.1 l

9b) C4H10(g) + 13/2O2 -----> 4CO2 + 5H20

1 moles of butane produces 4 moles of CO2, It then follows that the volume of carbon dioxide produced is 4( 7.95 liters) = 31.8 litres

10b) CaCO3 ------> CO2 + CaO

Since the reaction is 1:1,  0.504 mol of CO2 is produced

PV =nRT

V = 0.504 * 0.082 * 273/1 atm

V = 11.3 L

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2Li + 2H2O____ 2LiaOH + 2H2

Answer:

2 Li + 2 H2O --> 2 LiaOH + 1 H2

They are converted into a single “o” when "ao" or "oo" are together when naming covalent bonds.

A covalent bond consists of the mutual sharing of one or more pairs of electrons between two atoms.

Sometimes, while naming the chemical compounds, a problem arises when compounds with “ao” and “oo” are written with -ide name. Conventionally, they are converted into a single “o”.

For example, the “ao” in the dichlorine hept-ao-xide ([tex]Cl_2O_7[/tex]). This “ao” in the [tex]Cl_2O_7[/tex] can be converted into “o”. As the result, the correct name of this compound would be dichlorine hept-o-xide.

Hence, they are converted into a single “o” when "ao" or "oo" are together when naming covalent bonds.

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Answer:

a chemical compound

Answer:

Substance

Explanation:

Any physical matter despite of living or non living things are composed by a set of molecules or atoms commonly known as substance

On specific living things are composed of biomolecules or cells where as non living things are composed of molecules and atoms

Answer:

Substances

Physical matters are divided into 3 states

As per randomness of particles the order is

The variable "air pressure inside the football" in this experiment is quantitative and dependent variable. Hence, option D is correct.

The dependent variable is the variable that is being measured or tested in an experiment.

In the experiment, the scientist filled the footballs with fix quantity of pressure which was then kept for 12 hours. After 12 hours the pressure inside the footballs was again measured. Pressure here is a quantitative variable.

Since the air temperature is an independent variable. The pressure being the dependent variable depends upon the temperature of the air.

Independent variable; The variable which does not depends upon any other variable.

Dependent variable; The variable which depends upon the independent variable or varies with the change independent variable.

Qualitative variables are variables which cannot be expressed in form of numbers. They generally convey the characteristic, category, quality or type.

Whereas Quantitative variables are the variables which can be expressed in the form of numbers. These are the variables which exist along the continuous sequence.

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Answer:

1. Used in many smoke detectors for homes and businesses to measure levels of toxic lead in dried paint sample to ensure uniform thickness in rolling processes like steel and paper production and to help determine where oil wells should be drilled.

2.Used to treat cancerous tumors to measure correct patient dosages of radioactive pharmaceutical to measure and control the liquid flow in oil pipelines to tell researchers whether oil wells are plugged by sand and to ensure the right fill level for packages of food, drugs, and other

products.

3.Used in medical diagnosis

4.Used to treat thyroid disorders. (Graves’s disease).

5.Used in molecular biology and genetics research.

6.Used in nuclear medicine for lung ventilation and blood flow studies.

7.Used in dental fixtures like crowns and dentures to provide a Uranium-234 natural color and brightness.

8.Used in electric blanket thermostats and to gauge the thickness of thin plastics, thin sheet metal, rubber, textile and paper.

Answer:

B.

Explanation:

customization requires more material, more machine time which can creates a greater impact on the environment in the sense of pollution (travel by the extra employees, creation of custom materials, increased machine running time). Good luck in your studies. Hope this answers your question in full.

Answer:

1.20 M (3 s.f.)

Explanation:

In this question, we are trying to find the concentration of KCl after dilution. Note that the number of moles of KCl does not change.

[tex]g \div \frac{g}{mol} = g \times \frac{mol}{g} = mol[/tex]

Number of moles of KCl

= 44.7 ÷74.55

= 0.59960 mol (5 s.f.)

New volume

= 500 mL

= (500 ÷1000) L

= 0.5 L

Concentration after dilution

= 0.59960 ÷0.5

= 1.1992 mol/L

= 1.20 M (3 s.f.)

* M is the symbol for Molarity, which is also equal to mol/L

Answer:

the IUPAC name is: 2-ethyl-3-methyl-pentanal

Answer:

Thus IUPAC name is: 3-methylpentane. Was this answer helpful?

Explanation:

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Cr₂O₃ ( s ) + 3H₂S ( g ) → Cr₂S₃ ( s ) + 3H₂O ( l )

mol  Cr₂S₃ = 421 : 200.19 g/mol = 2.103

mol Cr₂O₃ ≈ mol Cr₂S₃ = 2.103 ( equivalent coefficient)

mass Cr₂O₃ = 2.103 x 151.99 g/mol = 319.63 gr

Quartz and Feldspar will be comparatively larger in size since they are formed from cooling of magma while Pyroxene and Olivine are formed by the cooling of lava.

Magma is molten rock that is found deep within the earth's crust whereas Lava is molten rocks that comes up and flows on the earth's surface.

Minerals formed from magma and lava have comparatively different sizes.

Minerals formed from magma are larger in size than minerals formed from Lava. This is because minerals formed from magma undergo slower cooling, and thus, have a longer time to grow in size. However, minerals formed from lava have a relatively shorter cooling time and do not grow into very large sizes.

Therefore, Quartz and Feldspar will be comparatively larger in size since they are formed from cooling of magma while Pyroxene and Olivine are formed by the cooling of lava.

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The noble gas configurations for

Li= [He] 2s¹, Na=[Ne] 3s¹ and K =[Ar] 4s¹.

Noble gas configurations are the term for the electronic configurations of the atoms for which the electronic configuration becomes very larger i.e, for the higher atomic numbers.

For the noble gas electronic configurations, the noble gas, which is before that atom is written.

So, the Lithium can be represented as [He] 2s¹.

So, the Sodium can be represented as [Ne] 3s¹.

So, the Potassium can be represented as [Ar] 4s¹.

Hence, the noble gas configurations for Lithium= [He] 2s¹, Sodium=[Ne] 3s¹ and potassium =[Ar] 4s¹.

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A sample of rainwater with a pH of 3.5 is sure to contain a large concentration of [tex]H_3O^+[/tex]

A pH value of 7 downward is said to be acidic. Upward of 7 is said to be basic. A pH of 7 on the dot is said to be neutral.

An acid is defined as a substance that produces  [tex]H_3O^+[/tex] as its only positively charged ion in solution.

Thus, rainwater with a pH of 3.5 is acidic and will contain a high concentration of  [tex]H_3O^+[/tex].

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Answer:

5.06 M LiCl

Explanation:

To find the new molarity of the solution, you need to (1) find the amount of moles LiCl (via the molarity equation using the original molarity and volume) and then (2) calculate the new molarity (via the molarity equation using the new volume and old moles). The final answer should have 3 sig figs to match the given values.

Molarity (M) = moles / volume (L)

Step (1)

381 mL / 1,000 = 0.381 L

Molarity = moles / volume

9.96 M = moles / 0.381 L

(9.96 M) x (0.381 L) = moles

3.79 = moles

Step (2)

750 mL / 1,000 = 0.750 L

Molarity = moles / volume

Molarity = 3.79 moles / 0.750 L

Molarity = 5.06 M

The amount of nitrogen oxide in the air sample is determined as 7.01 ppb.

The amount of Nitrogen oxide (NO2) in the air in parts per billion (ppb) is calculated as follows;

12 micrograms of NO2 = 12 μg = 12 x 10⁻⁶ g

PV = nRT

V = nRT/P

Where;

n = m/M

M = molar mass of NO2 = 46

n =  12 x 10⁻⁶/46

n = 2.73 x 10⁻⁷ mole

V = (2.73 x 10⁻⁷ x 0.082057 x 313)/(1)

V = 7.01 x 10⁻⁶ L

V =  7.01 x 10⁻⁹ m³

= (Volume of NO2)/(volume of air) x 10⁹

= (7.01 x 10⁻⁹)/(1) x  10⁹

= 7.01 ppb

Thus, the amount of nitrogen oxide in the air sample is determined as 7.01 ppb.

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Answer:

c) oil and vinegar

Explanation:

A heterogeneous mixture is a mixture that does not have a "uniform composition" (meaning that the entire mixture is not thoroughly mixed to be the exact same. In different parts of the mixture, there is a              non-consistent / differing composition.)

Oil and vinegar, as you may know, do not thoroughly mix when put together--different parts of the mixture are made of different compositions. Some parts are made of oil, and some are a concentration of vinegar, but because they are not able to be mixed entirely, the mixture is considered a heterogeneous mixture. If you were to take different samples of different parts of the liquid, you would have a clear separation of oil and vinegar.

Milk is thoroughly milk--if you take out a tablespoon, it will be milk entirely--and it will have the same composition as all of the other milk in the bottle.

Air is complicated--and it can be described as either, but the question was likely intending the answer of oil and vinegar.

Vinegar and water do thoroughly mix. Vinegar absorbs water on a molecular level, so the mixture is thoroughly mixed when put together.

(Hope this helps!)

The movements of the substance across the dialysis membrane are as following: water: Moves in both directions.

Glucose: Moves into the blood.

Urea: Moves out of the blood.

Na, K, and Ca ions: Moves in both directions.

Dialysis is a process of filtration and purification of blood by a machine. This machine helped those people whose kidney stop working and doesn't purify the blood.

Thus, the correct options are: water: Moves in both directions.

Glucose: Moves into the blood.

Urea: Moves out of the blood.

Na, K, and Ca ions: Moves in both directions.

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Energy levels inside an atom are the specific energies that electrons can have when energy occupies specific orbitals. Electrons can be excited to higher energy levels by absorbing energy from the surroundings, an equivalent light is emitted when an electron returns from a high energy state to a lower one. Representation of this diagrammatic is known as the energy level diagram.

Answer:

Natural Selection

The answer is:

A. Natural Selection

The ionization energy will increase substantially when 11th electron is removed compared to when the 10th electron is removed.

Ionization energy is the energy required to remove one or more electrons from a neutral atom in its gaseous state to form a positively-charged ion.

The ionization energy increases steadily as successive electrons are removed from an atom. A substantial increase in ionization energy occurs with the removal of an electron from a filled inner shell.

The 10th electrons is the last electron in the L shell of atoms. The 11th electron is the first electron in a  filled inner shell.

Therefore, ionization energy will increase substantially when 11th electron is removed compared to when the 10th electron is removed.

Note that there was no attached graph and the answer was given based on the general trend observed in ionization energies.

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Answer:

1 C₂H₆O

Explanation:

The given equation:

C₂H₆O + 3 O₂ ---> 2 CO₂ + 3 H₂O

Reactants: 2 carbon, 6 hydrogen, 7 oxygen

Products: 2 carbon, 6 hydrogen, 7 oxygen

As you can see, the amount of each element on both sides is identical. Therefore, the reaction is already balanced. This means that the coefficient in front of C₂H₆O is 1. When writing the equation, writing the one is insignificant and usually left out.

The number of grams of Cl2 formed when 0.385 mol HCl reacts with an excess of O2 is 13.6675 g.

A mole is defined as 6.02214076 × [tex]10^{23}[/tex] of some chemical unit, be it atoms, molecules, ions, or others. The mole is a convenient unit to use because of the great number of atoms, molecules, or others in any substance.

Given data:

Moles of hydrochloric acid = 0.385 mol

Mass of chlorine gas =?

Chemical equation:

4HCl +  O₂ → 2Cl₂  + 2H₂O

Now we will compare the moles of Cl₂ with HCl.

                 HCl           :               Cl₂

                   4             :               2

                0.385       :              2÷4× 0.385 = 0.1925 mol

Oxygen is present in excess that's why the mass of chlorine produced depends upon the available amount of HCl.

Mass of Cl₂ :

Mass of Cl₂ = moles × molar mass

Mass of Cl₂ =0.1925 mol × 71 g/mol

Mass of Cl₂ =  13.6675 g

Hence, the number of grams of Cl2 formed when 0.385 mol HCl reacts with an excess of O2 is 13.6675 g.

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The percentage of the area under the normal distribution curve would lie above 98.02 on the x-axis is 2.5 % , option C is the answer.

Normal Distribution is a probability distribution which is symmetric about the mean , The frequency is more near the mean and less far from the mean.

It is given in the data that

10,000 more observations were collected

the percentage of the observations would be greater than 98.02 = ?

According to the 68-95-99.7 rule,

It states that approximately

68% of the observations lie within σ of µ

95% of the observations lie within 2σ of µ.

99.7% of the observations lie within 3σ of µ.

The percentage of the observation between various intervals is attached in the image in the answer.

2.1 percent of the population is distributed in the intervals between two and three standard deviations , which is the zone above 2SD and below 3SD.

As 2.1 % is approximate , Therefore from the given option , 2.5%

The percentage of the area under the normal distribution curve would lie above 98.02 on the x-axis is 2.5 % , option C is the answer.

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Answer:

An open system is :-

B. A system that allows energy and mass to move in and out of it.

Example :-

Water boiling in a pot on a stove. (Without lid).