7) K₂CO3
# of molecules:
# of elements:
Name of element:
Total # of atoms:
The #3 is a
# of atoms:
(coefficient or subscript)

Answer:

1) 70

2) conduction

3) The ground absorbs the solar radiation and

releases it throughout the later afternoon.

4) transpiration

5) convection

6) cumulonimbus

7) reflectivity of Earth’s surface

8) As temperature increases, air pressure

increases.

9) thermosphere

10) convection cells, pressure belts, and the

Coriolis effect

11) radiation

12) pollen

13) scattering

14) thermosphere

15) The different types of clouds are:

cumulus: Cumulus clouds are clouds which have flat bases and are often described as "puffy", "cotton-like" or "fluffy" in appearance. Their name derives from the Latin cumulo-, meaning heap or pile.

cirrus: Cirrus is a genus of atmospheric cloud generally characterized by thin, wispy strands, that typically appear white or light grey. The name is derived from the Latin word cirrus, meaning 'ringlet' or 'curling lock of hair'. Such a cloud can form at any altitude between 5,000 and 13,700 m above sea level.

stratus: Stratus clouds are low-level clouds characterized by horizontal layering with a uniform base, as opposed to convective or cumuliform clouds that are formed by rising thermals.

nimbus: Nimbostratus clouds are dark, grey, featureless layers of cloud, thick enough to block out the Sun and produce persistent rain. Height of base: 2,000 - 10,000 ft. Shape: Bands or areas of individual cells. Latin: nimbus - rainy cloud; stratus - flattened or spread out. Precipitation: Continuous rain or snow likely.

16) the tradewinds

17) the location’s latitude

18) Cirrus clouds

19) the ozone layer

20) Global winds are created by both the spin of

the Earth (Coriolis effect) and the differences

in temperature between the equator and

the polar areas. These winds are often

grouped together as trade winds, easterlies,

and westerlies.

21) nitrogen

22) the Miller-Urey hypothesis

the Oparin-Haldane hypothesis

23) ammonia gas

24) cumulus

25) It determines the mass of water in a volume of air

Explanation:

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Answer:

Physicians do not have to treat every ill patient. However they must uphold their ethics (eg. do no harm, confidentiatlity, etc.).

Explanation:

Primary source:

Hippocratic Oath (translation since it's originally in Greek)

I swear by Apollo the physician, and Asclepius, and Hygieia and Panacea and all the gods and goddesses as my witnesses, that, according to my ability and judgement, I will keep this Oath and this contract:

To hold him who taught me this art equally dear to me as my parents, to be a partner in life with him, and to fulfill his needs when required; to look upon his offspring as equals to my own siblings, and to teach them this art, if they shall wish to learn it, without fee or contract; and that by the set rules, lectures, and every other mode of instruction, I will impart a knowledge of the art to my own sons, and those of my teachers, and to students bound by this contract and having sworn this Oath to the law of medicine, but to no others.

I will use those dietary regimens which will benefit my patients according to my greatest ability and judgement, and I will do no harm or injustice to them.

I will not give a lethal drug to anyone if I am asked, nor will I advise such a plan; and similarly I will not give a woman a pessary to cause an abortion.

In purity and according to divine law will I carry out my life and my art.

I will not use the knife, even upon those suffering from stones, but I will leave this to those who are trained in this craft.

Into whatever homes I go, I will enter them for the benefit of the sick, avoiding any voluntary act of impropriety or corruption, including the seduction of women or men, whether they are free men or slaves.

Whatever I see or hear in the lives of my patients, whether in connection with my professional practice or not, which ought not to be spoken of outside, I will keep secret, as considering all such things to be private.

So long as I maintain this Oath faithfully and without corruption, may it be granted to me to partake of life fully and the practice of my art, gaining the respect of all men for all time. However, should I transgress this Oath and violate it, may the opposite be my fate.

Answer: A question is asked and/or. A problem is identified and/or. ...

An inference is based on these observations and a. Hypothesis is made.

An experiment is designed and conducted. Results are collected and recorded.

The results are examined and. Discussed and finally. ...

SOMETIMES. Further questions are asked,

Explanation:

Particle X represents Protons

Particle Y represents Electrons

Particle Z represents Neutrons

An atom consist of three subatomic particles which are

In the nucleus of an atom, we have the proton and neutron. Protons are positively charged while neutrons have no charge.

Electrons are located outside the nucleus and are negatively-charged.

In the given diagram,

X has a positive charge which indicate that X represents protons.

Z is in the nucleus of the atom, and has no charge. This indicates that Z represent neutrons.

Y is located outside of the nucleus, thus, Y represents electrons.

Hence,

Particle X represents Protons

Particle Y represents Electrons

Particle Z represents Neutrons

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During the electrolysis of molten sodium chloride (NaCl), the substance produced at the cathode is metallic sodium (Na). Therefore, the correct answer is option E: Na metal.

During the electrolysis process, when an electric current is passed through molten NaCl, the NaCl dissociates into its ions: Na+ and Cl-. At the cathode, which is the negative electrode, the positively charged Na+ ions are attracted and undergo reduction. The reduction reaction at the cathode involves gaining electrons to form neutral sodium atoms, which then combine to form metallic sodium (Na). This is represented by the equation: 2Na+ + 2e- → 2Na.

The other options, such as O2 (option A), Cl2 (option B), NaOH (option C), and H2 (option D), are products that can be formed during different electrochemical processes, but they are not the products of the electrolysis of molten NaCl. In this particular case, the main product at the cathode is sodium metal.

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The balanced reaction equation is;

X2 + 3H2 + 2XH3

The steps in balancing reaction equations are;

Write the unbalanced chemical equation, using correct chemical formulas for the reactants and products.

Count the number of atoms of each element on both sides of the equation, and make a list of the elements and their corresponding numbers.

Begin by balancing the elements that appear in only one compound on each side of the equation.

Adjust the coefficients of the reactants and products to make the number of atoms of each element the same on both sides of the equation.

Check that the equation is balanced by counting the number of atoms of each element on both sides of the equation again.

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The properties of cohesion, adhesion, capillary action, and polarity are important properties of water. These properties enable water to travel up the plant stem against gravity, leading to the plant being able to absorb water through its roots.

Water is a vital component of plant life. It is a source of nutrients and helps plants to carry out photosynthesis. Cohesion, adhesion, capillary action, and polarity are unique properties of water that are important in this process.Cohesion refers to the ability of water molecules to stick together. This is important because when water molecules stick together, they create a surface tension that helps water to maintain its shape.

This surface tension enables water to be drawn up the plant stem.Adhesion refers to the ability of water molecules to stick to other surfaces. This is important because when water sticks to the sides of the plant stem, it helps to hold the water in place, allowing the plant to absorb water through its roots.Capillary action refers to the ability of water to move through small spaces.

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A particle is moving in the positive direction when its displacement or velocity is in the direction of increasing values on the chosen coordinate axis.

The positive direction is determined by the chosen coordinate axis or reference frame. If the displacement or velocity of a particle is in the direction of increasing values along this axis, then the particle is moving in the positive direction. For example, if a particle is moving to the right along the x-axis or moving upwards along the y-axis, it is considered to be moving in the positive direction.

In summary, whether a particle is moving in the positive direction depends on the chosen coordinate axis and the direction of its displacement or velocity along that axis. It is important to define and establish the reference frame or coordinate system to accurately describe and analyze the motion of a particle in a given scenario.

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Answer:

The flow of thermal energy in a system, at constant atmospheric pressure AND at thermodynamic standard temperature and pressure.

Answer:

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Explanation:

Answer:

–99 °C

Explanation:

From the question given above, the following data were obtained:

Initial pressure (P₁) = 1.5 atm

Initial temperature (T₁) = 25 °C

Final pressure (P₂) = 1 atm

Change in temperature (ΔT) =?

Next, we shall determine the final temperature. This can be obtained as follow:

Initial pressure (P₁) = 1.5 atm

Initial temperature (T₁) = 25 °C + 273 = 298 K

Final pressure (P₂) = 1 atm

Final temperature (T₂) =?

P₁/T₁ = P₂/T₂

1.5 / 298 = 1 / T₂

Cross multiply

1.5 × T₂ = 298

Divide both side by 1.5

T₂ = 298 / 1.5

T₂ = 199 K

Converting 199 K to °C, we have:

T(°C) = T(K) – 273

T₂ = 199 – 173

T₂ = –74 °C

Finally, we shall determine change in temperature. This can be obtained:

Initial temperature (T₁) = 25 °C

Final temperature (T₂) = –74 °C

Change in temperature (ΔT) =?

ΔT = T₂ – T₁

ΔT = –74 – 25

ΔT = –99 °C

Thus, the change in the temperature is –99 °C

Answer:

b. This is a redox reaction in which octane (C8H18) is the reducing agent.

Explanation:

edge 2021 i just did it

The statement which best describes the reaction is:

This is not a redox reaction. It is an example of combustion.

This is a reaction which is accompanied by a change in the oxidation number of the reacting elements

This is a reaction in which a substance burns in air (oxygen) to produce carbon dioxide, CO₂ and water, H₂O

Considering the equation given

2C₈H₁₈ + 25O₂ —> 16CO₂ +18H₂O

we can see that C₈H₁₈ burns in air (oxygen) to produce carbon dioxide, CO₂ and water, H₂O

Thus, we can conclude that the reaction is not redox but an example of combustion reaction

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The first step we have to follow is to find the molar mass of FeCl2 using the atomic masses of each element:

It means that each mole of FeCl2 has a mass of 126.745g/mol.

Use the molar mass to find the mass of the given amount of moles:

It means that there are 110,141.405 grams of FeCl2.

In scientific notation it would be 1.10x10^5g.

there are 110,141.405 grams of FeCl2

Solution's pH made by putting 4.62 g of LiOH into water and diluting to a total volume of 400 ml is approximately 13.45.

To calculate the pH of the solution made by putting 4.62 g of LiOH into water and diluting to a total volume of 400 ml, we need to first determine the concentration of hydroxide ions (OH-) in the solution using the following formula:

Concentration of OH- = (moles of LiOH) / (volume of solution in liters)

The molar mass of LiOH is 23.95 g/mol + 16.00 g/mol + 1.01 g/mol = 40.96 g/mol. Therefore, the number of moles of LiOH in 4.62 g can be calculated as:

moles of LiOH = (4.62 g) / (40.96 g/mol) = 0.1127 mol

The volume of the solution is 400 ml, which is equivalent to 0.4 L. Therefore, the concentration of OH- in the solution can be calculated as:

Concentration of OH- = (0.1127 mol) / (0.4 L) = 0.2818 M

Next, we can use the formula for the pOH of a solution to determine the pH of the solution:

pOH =\(-log[OH-]\)

pOH = \(-log(0.2818)\)

pOH = 0.5507

Finally, we can use the relationship between pH and pOH to calculate the pH of the solution:

pH = 14 - pOH

pH = 14 - 0.5507

pH = 13.4493

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To calculate a chemical equation, balance the number of atoms of each element on both sides of the equation. Once the equation is balanced, calculate the number of moles of each reactant or product required for a specific chemical reaction.

A chemical equation is a written representation of a chemical reaction. It shows the reactants on the left side of an arrow and the product on the right side of the arrow.

First, balance the number of atoms of each element on both sides of the equation. If the equation is not balanced, add coefficients to the reactants or products to balance the number of atoms of each element.

A balanced equation can be used to calculate the number of moles of each reactant or product required for a specific chemical reaction. Use the molar mass of each reactant or product and the balanced equation.

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Nonpolar solutes, such as hydrocarbons and oils, dissolve readily in gasoline.

Gasoline is a nonpolar solvent primarily composed of hydrocarbons. Nonpolar solvents dissolve nonpolar solutes more readily due to their similar molecular structures and intermolecular forces.

Polar solutes, on the other hand, have a separation of positive and negative charges within their molecules and are less likely to dissolve well in gasoline. Examples of polar solutes include water (H2O) and various ionic compounds.

Gasoline is commonly used as a solvent for nonpolar substances, such as oils, grease, and hydrocarbons found in fuels and lubricants. The nonpolar solute molecules can mix easily with the nonpolar gasoline molecules, forming a homogenous solution.

In conclusion, nonpolar solutes dissolve readily in gasoline due to their similar nonpolar nature. This compatibility arises from the shared molecular structure and intermolecular forces between the solute and the solvent. On the other hand, polar solutes, which have a separation of positive and negative charges within their molecules, are less likely to dissolve well in gasoline.

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Answer:

See below!

Explanation:

To find the symbol of the element, you have to use the periodic table.  

The mass number is the number of protons and neutrons in the atom.  

The atomic number is the number of protons in the atom.

You can find the number of protons from the periodic table.

You can find the neutrons by subtracting the mass number by the number of protons in the atom.

Unless you have an ion, you will have the same amount of electrons as you do protons.

To write in nuclear notation, you write the chemical symbol with the mass number and atomic number shown in the attachment.  It is preferable to have the mass number and atomic number directly above each other.

P = 3.67 atm is the total pressure in the flask assuming that the initial pressure was 0 atm .

What is Ideal gas law ?

The ideal gas law (also called the perfect gas law), the relationship between the pressure P, volume V, and temperature T of a gas in the boundary region between low pressure and high temperature. Gas molecules move almost independently. each other .

PV = nRT, where n is the number of moles of gas and R is the universal (or perfect) gas constant, 8.31446261815324 joules/kelvin/mol (the universal gas constant is defined as Avogadro's number NA multiplied by Boltzmann's constant k) . ) In the International System of Units, energy is measured in joules, volume in cubic meters (m3), force in newtons (N), and pressure in pascals (Pa). where 1 Pa = 1 N/m2. A force of 1 Newton moving a distance of 1 meter does 1 Joule of work. Therefore, the product of both PV and nRT has the dimension of work (energy).

For He:  PV = nRT and n = PV/RT

n = (5.6 atm)(3.0 L)/(0.0821 Latm/Kmol)(298K) = 0.687 moles He

For Ne:  PV = nRT and n = PV/RT

n = (3.6 atm)(4.5 L)/(0.0821 Latm/Kmol)(298K) = 0.662 moles Ne

Total moles = 0.687 + 0.662 = 1.349 moles

PV = nRT

P = nRT/V

P = (1.349 mol)(0.0821 Latm/Kmol)(298 K)/9.0 L

P = 3.67 atm

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Ca(OH)₂⇒ Ca²⁺ + 2OH⁻

s                 s         2s

Ksp = [Ca²⁺][OH⁻]²

Ca(NO₃)₂ ⇒ Ca²⁺ + 2NO₃⁻

0.1 M             0.1        0.2

Input in Ksp

1.3 x 10⁻⁶ = 0.1 . 4s²

s² = 3.25 x 10⁻⁶

s = 1.8 x 10⁻³

1.8 x 10⁻³ is the molar solubility. Solubility is the amount of a substance that can be dissolved in a liquid to form a solution.

Solubility is the amount of a substance that can be dissolved in a liquid to form a solution; it is typically represented as grammes of solute every litre of liquid. One fluid's (liquid or gas) solubility in another can be entire (e.g., methanol and water are completely miscible) or partial (e.g., oil and water barely mix). Generally speaking, "like dissolves like" (for instance, the aromatic hydrocarbons dissolves in one another but not in water).

A material's solubility in two solvents is measured by the distribution coefficient, which is used in some separation techniques (such as absorption and extraction). In general, as temperature rises, so do the dissolution rates of solids in liquids, while they fall as temperature rises and rise with pressure for gases.

Ca(OH)₂⇒ Ca²⁺ + 2OH⁻

s                 s         2s

Ksp = [Ca²⁺][OH⁻]²

Ca(NO₃)₂ ⇒ Ca²⁺ + 2NO₃⁻

0.1 M             0.1        0.2

1.3 x 10⁻⁶ = 0.1 . 4s²

s² = 3.25 x 10⁻⁶

s = 1.8 x 10⁻³

Therefore, 1.8 x 10⁻³ is the molar solubility.

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Answer:

b bitter

Explanation: can i have brainlist please

The incidence of allergies has increased in recent years due to all of the following except for one factor.

The increase in allergies has been attributed to various factors such as changes in diet, environmental pollution, and overuse of antibiotics. However, one factor that has not been linked to the rise in allergies is vaccination. Numerous studies have shown that vaccines do not cause allergies and are not a contributing factor to the increase in allergic reactions. In fact, vaccines have been proven to prevent serious and potentially life-threatening diseases that can further weaken the immune system and increase the risk of allergies. Therefore, it is important to continue promoting the benefits of vaccination to protect public health.

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For a coordination compound of cobalt,\([Co(NH_3)_5Cl]Cl_2\), the oxidation and coordination number of cobalt in this compound are +3 and 6 present in option(1) and option(3) respectively.

The oxidation state or number of an atom is equal to the total number of removed electrons from an element (i.e., positive oxidation state) or added to an element (i.e., negative oxidation state) to reach its present state. Its possible value can be positive, negative, or zero.

Coordination number is defined as the number of legends bounded or attached by central metal. For example, in the compound [Cr(NH₃)₂Cl₂Br₂ ]⁻ , Cr³⁺ is a central atom that has six legends bounded with it so coordination number is 6.

We have a coordination compound of cobalt \([Co(NH_3)_5Cl]Cl_2\)

As we know oxidation state of chlorine,Cl and amonia, NH3 are -1 and 0 respectively. So, \([Co(NH_3)_5Cl]^{2 + } \), using oxidation state formula, oxidation number of cobalt, x

=> x + 5(0) - 1 = 2

=> x = 2 + 1 = 3

so, oxidation state is 3. Also, central metal is Co³⁺ and the number of legends bounded by central metal = 6. Hence, required value is 6.

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Answer:

HFusion*mass + Spec.Heat*mass*ΔT + HVap*mass

80cal/g*50.0g + 1.00cal/g°C*50.0g*(100°C-0°C) + 540cal/g*50g

3.60x10⁵cal

Explanation:

Using the HFusion we can find the heat needed to convert the ice to liquid water.

With specific heat capacity we can find the heat needed to increase the temperature of water from 0 to 100°C.

With HVap we can find the heat to convert the liquid water into steam.

The equations are:

Computing the values:

36000cal =

Answer:

425 and 0.28A

Explanation:

Resistance for resistors in parallel

1/ R = 1/250 +1/250

=0.008

R = 1/ 0.008 = 125

Total resistance

R= 125+ 300

=425

...

V= IR

I= V/R

I = 120/425

= 0.28 A

The enthalpy change for the formation of hydrogen peroxide is -473.6 kJ.

To calculate the enthalpy change for the formation of hydrogen peroxide (H2O2), we can use the given data:

The enthalpy change for the decomposition of hydrogen peroxide:

H2O2(l) → H2O(l) + 1/2 O2(g) ΔH = -98.0 kJ

The enthalpy change for the formation of water (H2O) from hydrogen gas (H2) and oxygen gas (O2):

2 H2(g) + O2(g) → 2 H2O(l) ΔH = -571.6 kJ

We want to find the enthalpy change for the formation of hydrogen peroxide, which is the reverse of the decomposition reaction.

Since the enthalpy change is additive, we can reverse the sign of the decomposition reaction and add it to the formation of water reaction:

Reverse of decomposition reaction:

H2O(l) + 1/2 O2(g) → H2O2(l) ΔH = 98.0 kJ

Adding the two reactions:

2 H2(g) + O2(g) → 2 H2O(l) ΔH = -571.6 kJ

H2O(l) + 1/2 O2(g) → H2O2(l) ΔH = 98.0 kJ

By adding these equations, we can cancel out the water (H2O) on both sides to obtain:

2 H2(g) + O2(g) → H2O2(l) ΔH = -473.6 kJ

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Answer:

I don't understand but I can tell u this:

Na has one extra valence electron and Cl has one missing one. Chemical reactions and forming of compounds is all in the electrons and not the nucleus. So, when highly reactive Na mixes with Cl, they form a stable compound called NaCl, or table salt.

If we are making one molecule of sodium chloride, we need one sodium atom and one chlorine atom. The formula of sodium chloride is NaCl.

Sodium chloride is an ionic compound formed by the combination of sodium and chlorine atoms. One molecule of sodium chloride contains one sodium and one chlorine atom to form NaCl. Now if we are making one mole of NaCl, we need 6.022 × 10²³ atoms of each element.

Sodium is a metal and possess extra one electron in its valence shell. Chlorine have 7 valence  electrons thus, it needs one more electron to attain octet. Sodium donates its electron to chlorine and gains a positive charge.

Chlorine gains a negative charge by accepting the electron from sodium. This opposite charge clouds undergo electrostatic force of attraction. And thus, it an ionic bond forms between them.

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Answer:

7.8 g/cm³

Explanation:

The density of an object can be defined as the object's mass divided by its volume:

We are given both the mass and volume by the problem, so we compute the data in the equation:

This means the density of the object is 7.8 g/cm³.

Answer:results from the attractive force between a hydrogen atom covalently bonded to a electronegative atom

Explanation: