The weather is warm and dry
Which change would bring a cold front in

A.several days of gray skies

A.dry air and sunny skies

B.rain or thunderstorms

C.extended period of rain or snow

Answer:

its hydroxy and alkoxy

Explanation:

ester is mainly formed by substitution reaction of carboxylic acid and alcohol

The esters are generally produced as a result of the reaction called esterification. They are generally derived from carboxylic acids. The functional group present in ester is OR. The correct option is E.

The chemical compounds which are derived from an acid either organic or inorganic in which at least -OH ( hydroxyl group ) is replaced by an -O- alkyl group ( alkoxy ) group are called esters. Generally an ester can be represented as R - C = O - OR.

The chemical compounds that are formed by the reaction of an acid and alcohol by losing water molecule can be defined as the esters.

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Answer: The size of an atom is generally considered as the distance between the outer shell electrons and the nucleus, i.e., the atom's radius. The larger the atomic radius, the lesser the reactivity of an element. It is because when the electrons are away from the nucleus, there is less electron density on the atom.

Answer:

40 if you want if simple

Explanation:

Molar mass is the amount grams that one mole weighs.  You need to find the molar mass of NaCl which is the same as the amu on the periodic table in grams. So it is 22.99(Na) + 35.45(Cl) = 58.44

You also know that for every mole of NaCl you have 1 mole of Na because every molecule of NaCl has 1 atom of Na.

Finally, using the periodic table, again, you see that the molar mass of Na is 22.99.

Then using stoichiometry, you can find the grams of sodium.

100(g NaCl) * 1 mol (NaCl)/58.44 g (NaCl) * 1 mol (Na)/ 1 mol (NaCl) * 22.99 (g of Na)/ 1 mol (Na)

which equals 39.339435 g of Na.

If you need to maintain significant figures the answer will be 40.

Answer: \(5.15\times 10^5kg\)

Explanation:

According to avogadro's law, 1 mole of every substance weighs equal to the molecular mass and contains avogadro's number of particles.

To calculate the number of moles, we use the equation:

Putting in the values we get:

\(\text{Number of moles}=\frac{1.00\times 10^{31}}{6.023\times 10^{23}}=0.166\times 10^{8}moles\)

1 mole of phosphorous \(P\) weighs = 31 g

Thus \(0.166\times 10^8\) moles of phosphorous \(P\) weigh=\(\frac{31}{1}\times 0.166\times 10^8=5.15\times 10^8g=5.15\times 10^5kg\)

I apologize of I'm wrong but its probably OA

Sorry once again!

~wise rat

Answer: C.

Explanation:

gasoline evaporating into the air

Answer:

In a chemical reaction, reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.

Explanation:

Jeremiah can arrange the materials in the following way to create a model that shows the processes by which water is cycled from a lake into the atmosphere and back to the lake

The following can be a representation of the water cycle;

Fill the glass jar with water to resemble the lake.

Put the lamp next to the jar to symbolize the sun.

Wrap the jar in plastic sheet to imitate the atmosphere.

Turn on the bulb to represent the sun warming the water.

When the water in the jar warms up and evaporates into water vapor, moisture will condense on the plastic wrap.

The water vapor will ascend and collect on the plastic wrap to represent the water vapor rising into the atmosphere.

Water vapor cools as it rises and condenses back into liquid form, as shown by the water droplets gathering on the plastic wrap.

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Answer:

2.18 mol Ar.

Explanation:

Hello there!

In this case, according to the definition of mole as the amount of particles of a given substance, it is possible to introduce the Avogadro's number to assert that 1 mole of any element contains 6.022x10²³ atoms; thus, the moles of Ar in the given amount of atoms turns out to be:

\(1.31x10^{24}Ar atoms*\frac{1molAr}{6.022x10^{23}atoms}\\\\=2.18molAr\)

Best regards!

Answer:

A. Acidity or the basic nature of a substance

Answer:

A)The characteristic frequency to look out for is  1720-1740 cm-1 (for C=O) for which will disappear in the end product but initially present in the reactant.

B)Characteristic frequency  present in the infrared spectrum will be at a peak of  3300-3400 cm-1 which will be due to O-H stretch.

C)If the product is wet with water there will be no change in the infrared spectrum

Explanation:

The characteristic frequency to look out for is  1720-1740 cm-1 (for C=O) for which will disappear in the end product but initially present in the reactant.

Characteristic frequency  present in the infrared spectrum will be at a peak of 3300-3400 cm-1 which will be due to O-H stretch.

If the product is wet with water there will be no change in the infrared spectrum

The characteristics frequencies.

As per the questions, the frequencies of  infrared spectrum of the sodium borohydride are reduced and produced determines the carbonyl group has to be converted to an alcohol functional group The transformation has to be take place.

Thus the answer is frequency would look 1720-1740 cm-1

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Answer:

a chemical which promotes a chemical reaction

and sppeds up that reaction.

Answer:

NaS2 it is the most stable

The four lines observed in the visible emission spectrum of hydrogen gas tell us that (b) Only certain energies are allowed for the electron in a hydrogen atom.

The observed lines in the hydrogen spectrum correspond to specific energy transitions of the electron within the hydrogen atom. These transitions occur when the electron moves between different energy levels within the atom. Each line represents a specific energy difference between two energy levels, and the wavelengths of these lines correspond to different colors in the visible spectrum.

The observed spectral lines provide evidence for the quantized nature of energy levels in hydrogen. According to quantum mechanics, electrons in atoms can only occupy certain discrete energy levels. The emission lines in the hydrogen spectrum indicate that the electron in a hydrogen atom can only exist in specific energy states, and it transitions between these states by either emitting or absorbing energy in the form of photons. The other options in your statement are incorrect:

a. The hydrogen molecules they came from have the formula H4: The hydrogen spectrum is related to the behavior of individual hydrogen atoms, not hydrogen molecules. Hydrogen molecules (H2) have different energy levels and do not produce the observed spectral lines.

c. We could observe more lines if we had a stronger prism: The number and position of the spectral lines in the hydrogen spectrum are determined by the energy differences between the electron energy levels. The strength of the prism or the spectroscopic instrument does not affect the number of observed lines. However, a higher-resolution instrument may allow for more precise measurement of the wavelengths of the lines.

d. There are four electrons in an excited hydrogen atom: A hydrogen atom normally contains only one electron. The number of observed spectral lines does not provide information about the total number of electrons in the atom.

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According to the given equation, the number of NO3 ions in the reactants is 1 and in the products is 2, so to balance the equation we have assign 2 as the coefficient of AgNO3.

Also, assign 2 as the coefficient of Ag.

The first box must be filled in with a 2, the second and third boxes must be left empty and the last box must be filled in with a 2.

Answer:

Mass is the independent variable, and boiling point is the dependent variable.

Answer:

Nitrogen group element, any of the chemical elements that constitute Group 15 (Va) of the periodic table. The group consists of nitrogen (N), phosphorus (P), arsenic (As), antimony (Sb), bismuth (Bi), and moscovium (Mc)

Explanation: Hope i helped! :D

The equilibrium constant for the reaction is : Kc = [CO₂][H₂O] / [Na₂CO₃][NaHCO₃]².

The equilibrium constant describes the extent of the reaction at equilibrium.

Given reaction is an example of reversible reaction, meaning that the products can react to reform the reactants. Equilibrium constant, denoted as Kc, describes the extent of the reaction at equilibrium, and is given by:

Kc = [CO₂][H₂O] / [Na₂CO₃][NaHCO₃]²

The value of Kc depends on the temperature of the system and other conditions such as pressure. At room temperature, Kc for this reaction is approximately 0.14, indicating that the products (CO₂ and H₂O) are favored over the reactants (Na₂CO₃ and NaHCO₃) at equilibrium.

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For electricity generation, the three major parts of energy are fossil fuels (coal, natural gas, and petroleum), nuclear energy, and renewable power sources.

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Answer:

It can be A or B

Explanation:

Atoms of the same element have the same atomic number so the number of protons (and electrons) are same.

The number of degrees of freedom for a system made up of ice and water at equilibrium is 1.

The correct option is B.

A molecule's degree of freedom is how many different ways it can move, rotate, or vibrate in space when it is in the gas phase. There are three different kinds of degrees of freedom: translational, rotational, and vibrational.

The Gibbs phase rule states that F = C − P + 2.

where

F is the degree of freedom

C is the component

P is the phase involved

As a result, there are two degrees of freedom for a one-component, one-phase system, and any temperature and pressure are achievable within certain bounds.

From the phase rule formula:

F = C - P + 2

C is water = 1

P is liquid water and ice = 2

Hence,

F = 1 - 2 + 2

F = 1

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Answer:

\(\huge\boxed{\sf M_2 \approx 0.38 \ M}\)

Explanation:

Initial volume = \(V_1\) = 55.5 mL

Initial Molarity = \(M_1\) = 1.3 M

Final volume = \(V_2\) = 188.5 mL

Final Volume = \(V_2\) = ?

\(M_1V_1 = M_2V_2\)

Put the given data.

Finding new molarity.

\((55.5)(1.3)=(188.5)(M_2)\\\\72.15 = 188.5 (M_2)\\\\Divide \ both \ sides\ by \ 188.5\\\\72.15/188.5 = M_2\\\\M_2 \approx 0.38 \ M\\\\\rule[225]{225}{2}\)

Answer:

For deposition to happen, thermal energy must be removed from the gas. ... As water vapor loses thermal energy, it changes into solid frost. States of Water. Water is the only substance that exists naturally as a solid, a liquid, and a gas within Earth's temperature range.

Explanation:

Answer: you have to talk to someone who wont mind wanting to wanting to like you a lot like that.

Explanation:  I wish I could be able to talk to someone who would want to get to like me like that, so its a very relatable situation.

Answer: Cassegrain reflector telescope

Answer:

Cassegrain reflector

Explanation:

Scientist have used Hubble to observe the most distant stars and galaxies as well as the planets in our solar system.

By the concept of calculating moles ,it can br concluded that the no. of atoms of phosphorus in 8.80mol of copper(II) phosphate is=1.06\(x10^{25}\)

A mole is defined as amount of substance containing as many as elementary entities that are there in atoms of exactly 12 g of carbon-12.Therefore we can say,1 mole of copper(II) phosphate, Cu3(PO4)2, contains three moles of copper(II) cations and two moles of phosphate anions.

Again 1mole of phosphate anions contains one mole of phosphorus and four moles of oxygen.Considering all these informations we can conclude that:1 mole of copper(II) phosphate contains 2 moles of Phosphorus

Accordingle the sample contains=(8.80\(x\)2) moles of Phosphorus

                                    =(17.6\(x\)Avogadro's constant) atoms of  Phosphorus

                                    =(17.6\(x\)6.022\(x\)\(10^{23}\)) atoms of  Phosphorus

                                    =1.06\(x10^{25}\) [approx] no. of Phosphorus atoms

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In 8.80 moles of copper(II) phosphate, there are approximately 1.06 x 10²⁵ atoms of phosphorus.

The number of atoms of phosphorus in a given amount of a compound can be calculated using the concept of mole in chemistry. Copper(II) phosphate is Cu3(PO4)2, containing 2 moles of phosphorus (P) for every 1 mole of the compound. Avogadro's number (6.022 x 10²³) gives the number of atoms in one mole.

So, if there are 8.80 moles of copper(II) phosphate, there would be 2 × 8.80 moles of phosphorus. Multiplying this by Avogadro's number gives the total number of phosphorus atoms.

Therefore, the number of phosphorus atoms is 2 × 8.80 × 6.022 x 10²³ = 1.06 x 10²⁵ atoms of phosphorus.

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