There is a cold front heading towards San Francisco from the Pacific Ocean. In two days, what kind of weather do you expect for San Francisco?

When the number 22 is rewritten to have 1 significant figure, it becomes 20.

In the original statement, the number 22 has two significant figures because both digits (2 and 2) are considered significant.

When the number is rewritten with one significant figure, it is rounded to the nearest tens place, resulting in the number 20. In this case, the zero serves as a placeholder, indicating the magnitude of the number.

Assuming that the second 2 in the figure is 5 or above, 1 will be added to the first 2. In other words, the second 2 is not significant as far as rounding off is concerned.

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To measure reaction heat under isochoric conditions, a bomb calorimeter is needed.

This device is designed to maintain a constant volume (isochoric) during the reaction, allowing for accurate measurement of reaction heat. To improve the accuracy of the coffee cup calorimeter for measuring reaction heat under isobaric conditions, a modification that could be made is to use a stirring device to ensure uniform mixing of the reactants and to minimize heat loss to the surroundings.

Additionally, a lid with a small hole could be placed over the top of the calorimeter to prevent heat loss while still allowing for pressure equalization. These modifications would help to minimize errors in heat measurement and improve the accuracy of the results obtained.

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Answer:

pOH = -log[OH-]

Explanation:

Starting from the equation of [OH-], we can obtain the pOH formula clearing pOH, where 10 passes to the other side of the equation as the base of log, and then the negative sign is passed:

The atoms have different types of bonds holding molecules together and leads to evaporation.

Thus, A crucial stage in the Earth's water cycle is evaporation, which is the process by which water transforms from a liquid to a gas or vapor. Evaporation at the molecular level requires the interface to break at least one extremely strong intermolecular connection between two water molecules.

The chemical mechanism by which an evaporating water molecule acquires sufficient energy to escape from the surface has remained mysterious despite the significance of this activity.

Here, we demonstrate that the high kinetic energy of the evaporated water molecule is enabled by a precisely timed formation and dissolution of hydrogen bonds involving at least three water molecules at the interface, the recoil of which allows one water molecule to escape.

Thus, The atoms have different types of bonds holding molecules together and leads to evaporation.

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Answer:

In this experiment, the amount of ice is the independent variable, and the temperature change is the dependent variable.

Answer: A

Explanation:

The -ane suffix implies that the compound has only single bonds for carbon-carbon bonds. The but- prefix implies that the compound consists of four carbons. Since 4 bonds are required for each carbon, there will be a total of 10 hydrogen atoms: 3 on each carbon at the end of the chain and 2 for each carbon in the middle of the chain. Thus, butane is A.

Answer:

coal

Explanation:

fossil fuels are formed by natural process.

Coal is the fossil fuel. A is correct.

Fossil fuels are non renewable source of energy that means once they get finished we will not be able to use them. Hence it is very important for us to find an alternate like a renewable source of energy like sunlight so that we will not have to depend on these fossil fuels and will not have to tolerate the pollution happening by them as well.

Given options are-

A. Coal

B. Biomass

C. Geothermal

D. Nuclear

Therefore, Coal is the fossil fuel. A is correct.

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Rearranging the equation, mole molecular weight = mass, mass = molecular weight mole, and mole = mass / mol (multiply all sides by molecular weight).

Molecular formula: What is it?

The quantity of each element's atoms in one molecules of a chemical is expressed by the molecular formula. The formula that displays the precise figure of each atom within a molecule is known as a molecular formula. The Chemical Formula is determined using the empirical method whenever the molecular mass value is known. n = molar mass/empirical mass

Is access to Molecular Pharmaceutics open?

The cOAlition S has recognized Molecular Pharmaceutics as a transformational publication, pledging to make the switch to 100% accessibility in the future. Your open access fees may be funded by your sponsor through Dec 31, 2024, if your researcher funder have signed Plan S. For further details, kindly visit the ACS Scientific website.

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The density is 5g/cm³ and the cube is not gold and i will not buy it

Density is the mass of the object divided by its volume gives the density of the object

Here given data is

Mass = 40g

Volume of cube = 2cm

Volume = 2³

Volume = 2×2×2cm³

Volume = 8cm³

Density of cube = ?

Then formula of density is

Density = mass/volume

Density of cube =  40g/ 8cm³ = 5g/cm³

Therefore, the given gold has density = 19.3 g/cm³ and cube density is less than of gold so cube is not a gold and i will not buy it

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Answer:

the powerhouse of the cell

Answer:

Melting ice cubes. Melting solid salts. Evaporating liquid water. Converting frost to water vapor (melting, boiling, and evaporation, in general, are endothermic processes.

Answer:

~Reason _

Photosynthesis requires energy to drive the chemical reaction. Photosynthesis is an endothermic reaction. This means it cannot occur without energy (from the Sun). The light required is absorbed by a green pigment called chlorophyll in the leaves.

Ur answer is correct mate !!

#Hope it helps!!

To solve this type of question we must know the expression for rate law for first order kinetics. Therefore, the rate constant at 273 K is 8.11 x 10⁻⁷s⁻¹.

There are two kinds of rate law in chemical kinetics one is differential rate law and other is integrated rate law.

ln(k₁/k₂ )=-Ea /R(1/T₁-1/T₂)

Ea=102 kJ/mol

k₁=1.35 × 10⁻⁴ s⁻¹

T₁=306 K

k₂=?

T₂= 273 K

R=8.314J/kmol

substituting all the given values in the above equation, we get

ln(1.35 × 10⁻⁴ /k₂ )=-1.35 × 10⁻⁴ /8.314(1/306-1/273)

K\(_2\)=8.11 x 10⁻⁷s⁻¹

Therefore, the rate constant at 273 K is 8.11 x 10⁻⁷s⁻¹.

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Answer:

[A-] : [HA] = 1000 : 1

Explanation:

I'm assuming that you mean a pKa of 5 not a pa of 5
For this question, the equation:
pH = pKa + log([A-]/[HA])
plug in pH and pKa
8 = 5 + log([A-]/[HA])
move the 5 from the right to the left
3=log([A-]/[HA])
raise 10 to both sides of the equation to get rid of the log
10^3=10^(log([A-]/[HA]))
1000=[A-]/[HA]
so the ratio of [A-] to [HA] is 1000 to 1

Answer:

4Fe+3O2 - 2Fe2O3

Explanation:

HOPE THAT THIS IS HELPFUL .

HAVE A GREAT DAY.

Answer:

This is the idea of spontaneous generation, an obsolete theory that states that living organisms can originate from inanimate objects. Other common examples of spontaneous generation were that dust creates fleas, maggots arise from rotting meat, and bread or wheat left in a dark corner produces mice

Explanation:

hope you like my answer

The atomic weight of Aluminum (AL) is 26.98. It has 14 neutrons. Aluminum has  an atomic number 13. Therefore, option B is correct.

The atomic number of an element represents the number of protons in the nucleus of its atoms. Since the atomic number of an element is unique and determines its position in the periodic table, aluminum has an atomic number of 13.

The number of electrons in a neutral atom is equal to the number of protons, which in this case is 13. Therefore, aluminum has 13 electrons.

The atomic weight of aluminum (Al) is 26.98, which represents the weighted average mass of all the naturally occurring isotopes of aluminum, taking into account their relative abundances. The number of neutrons in an atom of aluminum is given as 14.

Thus, the correct option is B.

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Se producirán 36 gramos de agua

Explicación: Ya que en una reacción química no puede descubrir ningún cambio en masa total de las sustancias que en ella intervienen, pues en una reacción química ni se gana ni se pierde masa.  

The limiting reactant would be  H₂O.

The mass of the excess reactant would be 13.05 grams

Number of moles of P₂O5 = mass / molar mass

Number of moles of P₂O5 = 55 g / 141.88 g/mol

Number of moles of P₂O5 = 0.388 moles

Number of moles of H₂O = mass / molar mass

Number of moles of H₂O = 16 g / 18.02 g/mol

Number of moles of H₂O = 0.888 moles

Using the balanced chemical equation, we see that 1 mole of P₂O5 reacts with 3 moles of H₂O to produce 2 moles of H3PO4. Therefore, to react with all the P₂O5, we would need:

0.388 moles of P₂O5 × (3 moles of H₂O / 1 mole of P₂O5) = 1.164 moles of H₂O

Since we only have 0.888 moles of H₂O, it is the limiting reactant.

To determine the amount of excess P₂O5, we need to find how many moles of H₂O would be needed to react with all the P₂O5:

0.888 moles of H₂O × (1 mole of P₂O5 / 3 moles of H₂O) = 0.296 moles of P₂O5

The amount of excess P₂O5 is the initial moles of P₂O5 minus the moles of P₂O5 required to react with all the H₂O:

0.388 moles of P₂O5 - 0.296 moles of P₂O5 = 0.092 moles of excess P₂O5

Mass = 0.092 x 141.88 = 13.05 grams

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Answer: about one month

Explanation:

Answer:

Shortcoming:-After some time cell stops working because + electrolyte becomes more + and - ve electrolyte become more -ve with time.So there is difficulty in flowing of current.So it stops working after some time.

This Problem can be solved by using a u shaped tube salt bridge.Salt bridge completes the circuit and will maintain liquid liquid junction potential.And now there will be countinuous flow of e- or current.

The wavelength of the light is obtained as 122nm.

From the Bohr model of the atom, we know that an electron could absorb energy and move from a lower to a higher energy level. When this electron returns to its ground state, energy is emitted in the form of a photon of visible light.

Given that;

1/λ = RH (1/n1^2 - 1/n2^2)

λ = wavelength of the light

n1 = final level

n2 = initial level

1/λ = 1.097 * 10^7(1/1^2 - 1/2^2)

1/λ =  1.097 * 10^7(1 - 0.25)

λ = 1.22 * 10^-7 m or 122nm

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Ratio of moles of NH₃ produced to moles of N₂ used: 2 moles of NH₃ / 1 mole of N₂

Ratio of moles of NH₃ produced to moles of H₂ used: 2 moles of NH₃ / 3 moles of H₂

From the balanced chemical equation:

N₂ + 3 H₂ ⟶ 2 NH₃

We can determine the ratio of moles of products to the moles of each reactant.

Ratio of moles of NH₃ produced to moles of N₂ used:

From the balanced equation, we can see that 1 mole of N₂ reacts to produce 2 moles of NH₃. Therefore, the ratio is:

2 moles of NH₃ / 1 mole of N₂

Ratio of moles of NH₃ produced to moles of H₂ used:

From the balanced equation, we can see that 3 moles of H₂ react to produce 2 moles of NH₃. Therefore, the ratio is:

2 moles of NH₃ / 3 moles of H₂

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Given the equation of reaction;

N₂ + 3 H₂ ---> 2 NH₃

Calculate the ratio of the moles of produced to the moles of each of the reactants used. (Write two separate ratios.)

Answer:

b) From the person to the ice, and from the air to the ice

Explanation:

The direction of heat flow in the room is from the person to the ice and from the air to the ice.

The ice is at the lowest temperature.

Answer:

B - Exocytosis

Explanation:

Exocytosis is the process by which a large amount of molecules are released; thus it is a form of bulk transport. In exocytosis, membrane-bound secretory vesicles are carried to the cell membrane, and their contents are secreted into the extracellular environment.

Answer:

The solid phase has the lowest entropy.

Explanation:

Entropy (S) is the measure of how  spread out or dispersed the energy of a system is among the different possible ways  that system can contain energy. The greater the dispersal, the greater is the entropy.

In a solid, the atoms or molecules  are confined to fixed positions, thus, the dispersal is minimal and the entropy is at its lowest.

As we know that

P.E. = mgh

where,

P.E. = Potential energy of the object =?

m= mass of object= 3kg

g= acceleration due to gravity = 9.8 ms^-2

h = height between object and animal = 0 m

Then

P.E. = 3× 9.8 × 0 = 0 Joules or 0J

Have a luvely day!

Answer:

the vapor pressure of this solution would increase if some of the water were allowed to evaporate