i have a question, what does a man have to do to get the love of his life.

Answer:

C.164.1g/mol

Explanation:

40+14×2+16×6

164

The molar mass of Ca(NO3)2 is 164.1 g/mol.

Calcium nitrate, also called Norgessalpeter (Norwegian salpeter), is an inorganic compound with the formula Ca(NO3)2(H2O)x. The anhydrous compound, which is rarely encountered, absorbs moisture from the air to give the tetrahydrate. Both anhydrous and hydrated forms are colourless salts. Calcium nitrate is mainly used as a component in fertilizers, but it has other applications. Nitrocalcite is the name for a mineral which is a hydrated calcium nitrate that forms as an efflorescence where manure contacts concrete or limestone in a dry environment as in stables or caverns. A variety of related salts are known including calcium ammonium nitrate decahydrate and calcium potassium nitrate decahydrate.

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Answer:

Sandstone, limestone, and shale

Explanation:

The rocks are most likely to start as sediments carried in rivers and end up in lakes and oceans

Answer:

D - materials dissolved in solutions

Explanation:

EDGE 2021

The volume of the irregular solid from the image that have been shown is  12 mL

To obtain the volume of the irregular solid;

a. Measure the initial volume of water in the cylinder.

b. Carefully lower the irregular solid into the water, ensuring it is fully submerged without trapping any air bubbles.

c. Record the new volume of water in the cylinder.

d. The volume of the irregular solid is equal to the difference between the final and initial water volumes.

The volume is;

32 mL - 20 mL = 12 mL

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The heat of vaporization for water is 40.7 kJ/mol, the heat energy will be  6,105 kJ.

The heat of vaporization was described as the quantity of heat required to convert 1 gram of liquid into such a vapor without raising the liquid's temperature.

By using the formula:

q = m ΔH

where, q is heat m is mass and ΔH is heat of vaporization.

Given data:

ΔH = 40.7 kJ/mol

m = 150.0 g

Now, put the value of given data in heat of vaporization formula.

q = 150.0 g × 40.7 g J/mol

q =  6,105 kJ

Therefore, the heat will be 6,105 kJ.

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To determine the pKb1 of CO32-, we can use the relationship between pKa and pKb for conjugate acid-base pairs:

pKa + pKb = pKw

where pKw is the ionization constant of water, which is approximately 14. Therefore, we can rearrange the equation to solve for pKb:

The pKb value represents the negative logarithm of the equilibrium constant (Kb) for the reaction of a base with water. In this case, we are interested in the equilibrium reaction between CO32- and water, which can be represented as CO32- + H2O ⇌ HCO3- + OH-.

By utilizing the relationship pKa + pKb = pKw, we can rearrange the equation to solve for pKb. Given that pKa1 of H2CO3 is 6.35, we subtract this value from pKw (approximately 14) to obtain pKb1

pKb = pKw - pKa

pKb1 = 14 - 6.35 = 7.65

Since none of the given answer choices matches the calculated value, it seems there might be an error or omission in the available options. Please double-check the answer choices provided or refer to additional information to obtain the correct pKb1 value for CO32-.

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why helium is inactive

Answer:

13 Neutrons

Explanation:

Answer:

14 neutrons!

Explanation:

The mass number is the total number of protons and neutrons in a nucleus. The atomic number is the number of protons in the nucleus.

So... 27−13=14 neutrons

The following single displacement reaction can be written as,

Mg + CuSO4 (aq.) ----> Cu (s) + MgSO4 (aq.)

F2 + 2KBr ----> 2KF + (aq.) + Br2 (aq.).

Single displacement reaction is defined as a reaction in which one element is substituted for another element in a compound. The starting materials in the reaction are always pure elements. It is a type of reaction in which one element replaces a similar element in a compound. The general form of single-displacement reaction can be expressed as,

                     A+BC→AC+B

Mg + CuSO4 (aq.) ----> Cu (s) + MgSO4 (aq.)

F2 + 2KBr ----> 2KF + (aq.) + Br2 (aq.).

This reaction above is called as an oxidation-reduction or redox reaction:

Single displacement reaction is also called as single- replacement reaction. This involves a reaction in which one element is substituted for another element in a compound.

We can predict a single-displacement reaction if a reaction is characterized by one cation or anion trading places with another to form a new product. It is not difficult to predict when one of the reactants is an element and the other is a compound.

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The correct question is,

Write the reactions and predict the products of each of the following single replacement reactions. balance all reactions. if no reaction occurs write n. r.

Mg + CuSO4 (aq.) ---->

F2 + 2KBr ---->

Answer:

(ANSWER)

2 KNO3 + H2CO3 = K2CO3 +2 HNO3 is the balanced equation.

PA BRAINLYES

Answer:

What do you mean lots of points its only 8 points?

Explanation:

The alkali metals can't exist alone in nature because of incomplete outermost shell of alkali metals.

The alkali metals have the high thermal and electrical conductivity. It has high lustre, ductility, and malleability as compared to other materials. Each alkali metal atom has one electron in its outermost shell which make more reactive.

So we can conclude that the alkali metals can't exist alone in nature because of incomplete outermost shell of alkali metals.

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There are different types of compounds formed by the combination of different elements. From the given element card some of the compounds possible to form include CO₂, H₂O, NaCl, HF etc.

Compounds are formed by the combination of two or more atoms of different elements. There are ionic compounds, covalent compounds coordination compounds etc,.

Ionic compounds are formed between metals and non-metals. For example, Na has 1 valence electron and Cl have 7 valence electrons . Hence, Na donate one electron to Cl and both achieve octet and form the ionic compound NaCl.

H have only one electron and F with 7 valence electrons. They both share one electron each to fill the shell and form the covalent compound HF. Other compounds possibly formed from this group includes, H₂O, CO₂, SO₂, NaF etc.

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Answer:

The answer would be meniscus.

The preferred method for determining or validating the structure of organic molecules or those containing protons is ¹₁H NMR. When compared to other nuclei, a solution-state proton spectrum may be obtained relatively quickly, and it contains a wealth of knowledge regarding a compound's structure.

The study of matter's physical, chemical, and biological properties is done using NMR spectroscopy. It is used by chemists to ascertain the identity and structure of molecules.

By capturing the interaction of radiofrequency (Rf) electromagnetic radiations with the nuclei of molecules put in a high magnetic field, nuclear magnetic resonance (NMR) spectroscopy allows scientists to analyze molecules.

The structure of C₆H₁₂O₂ is:

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The structure of the nitrile that would give the carboxylic acid is a carbon atom triple bonded to a nitrogen atom and single bonded to an alkyl or aryl group. This structure is known as a nitrile group and is represented by the formula -C≡N. The nitrile precursor is the compound that contains this nitrile group and is used to synthesize the carboxylic acid.

For example, if the carboxylic acid is acetic acid (CH3COOH), then the nitrile precursor would be ethanenitrile (CH3CN). The nitrile group in ethanenitrile can be hydrolyzed to form the carboxylic acid group in acetic acid.

In general, the nitrile precursor for a carboxylic acid can be identified by removing the -COOH group from the carboxylic acid and replacing it with a -CN group. This will give the structure of the nitrile precursor that can be used to synthesize the carboxylic acid.

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Answer:

Chromium-51 has 24 protons, 28 neutrons, and 24 electrons.

Explanation:

The number of protons in the nucleus of the atom is equal to the atomic number (Z). The number of electrons in a neutral atom is equal to the number of protons. The mass number of the atom (M) is equal to the sum of the number of protons and neutrons in the nucleus.

The number of protons, neutrons, and electrons are Chromium-51 has 24 protons, 28 neutrons, and 24 electrons.

Protons, neutrons, and electrons are charged particles present inside the atom. Atoms are the basic unit of all matter. They together constitute the matter.

Protons are positively charged particles and neutrons are neutral particles. Neutrons and protons are present inside the nucleus of the atom. And electrons revolve around the nucleus in the orbitals of the atom.

In a neutral atom, there are exactly as many electrons as protons. The total number of protons and neutrons in the atom's nucleus is equal to the mass number (M) of the atom.

Thus, Chromium-51 has 24 protons, 28 neutrons, and 24 electrons.

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The mass percent of carbon in acetone is 21% (rounded to the nearest percentage).

Acetone (CH3)2CO has one carbon atom and the molecular weight of acetone is 58.08 g/mol. The mass percent of carbon in acetone can be determined using the given formula; mass percent of carbon = (mass of carbon/molar mass of acetone) × 100%Now, calculate the mass of carbon: Mass of carbon in acetone = 1 × 12.01 g/mol = 12.01 g/mol Now, substitute the mass of carbon and molar mass of acetone into the given formula: mass percent of carbon = (12.01 g/mol/58.08 g/mol) × 100% = 20.68% Rounding this answer to the nearest whole number will give the mass percent of carbon in acetone to be 21%.Therefore, the mass percent of carbon in acetone is 21% (rounded to the nearest percentage).

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The most common minerals within the Earth's crust are silicates.

*Silicates* are minerals composed primarily of silicon and *oxygen*, along with other elements like *aluminum*, iron, calcium, potassium, and sodium. They make up about 90% of the Earth's *crust*. Silicates are known for their diverse crystal structures, which form a network of silicon-oxygen tetrahedra. This network gives rise to a wide range of silicate minerals, including quartz, feldspar, mica, and clay minerals. Silicates are abundant because silicon and oxygen are the most abundant elements in the Earth's crust. While hydroxides, carbonates, and oxides are also important mineral groups, they are less common compared to silicates. Hydroxides contain the hydroxyl group (OH-) and include minerals like hematite and goethite. Carbonates include minerals such as calcite and dolomite, while oxides include minerals like hematite and magnetite.

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The refrigerator would use 180 kilowatt-hours (kWh) of electric energy over the course of 30 days, assuming it runs for 12 hours each day.

To calculate the kilowatt-hours (kWh) of electric energy used by the refrigerator in 30 days, we need to multiply the power rating by the total running time.

Given:

Power rating of the refrigerator = 500 W

Running time per day = 12 hours

Number of days = 30

First, we need to convert the power rating from watts to kilowatts:

Power rating = 500 W / 1000 = 0.5 kW

Next, we calculate the total energy used in kilowatt-hours (kWh) over the 30-day period:

Energy used = Power rating × Running time × Number of days

Energy used = 0.5 kW × 12 hours/day × 30 days

Energy used = 180 kWh

Therefore, the refrigerator would use 180 kilowatt-hours (kWh) of electric energy over the course of 30 days, assuming it runs for 12 hours each day.

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Weighing by difference eliminates systematic balance errors because the mass is determined by the difference between two readings, a systematic error in the absolute mass on the balance will be removed by subtracting the final weight from the initial weight.

Option (d) is correct.

Weighing by difference involves weighing the sample container before and after adding or removing the sample. By subtracting the final weight from the initial weight, the mass of the sample can be determined. This method helps eliminate systematic balance errors because any systematic error in the absolute mass reading of the balance will affect both the initial and final weights equally.

Weighing by difference takes into account any potential errors in the balance's absolute mass reading, such as calibration or zero errors, and focuses on the change in mass instead. This approach improves the accuracy of the measurement and reduces the impact of systematic errors associated with the balance.

Therefore, the correct option is (d).

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Answer:

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Explanation:

Answer:

The filament of a bulb has a high melting point because of the heat generated inside the bulb.

Explanation:

When electricity is concentrating and run through a bulb, it starts to generate heat. Leave it on long enough and it will start to build up a lot of heat. Have you ever tried touching a light bulb when it has been all day? It's scorching to the skin.

Since electricity generates heat, the bulb's filament has to have a high melting point so it doesn't melt, destroy the bulb, and leave you light-less. If the filament has a high melting point, then it is able to withstand heat generated by electricity and provide you light.

Answer:

A biology investigation usually starts with an observation—that is, something that catches the biologist’s attention. For instance, a cancer biologist might notice that a certain kind of cancer can't be treated with chemotherapy and wonder why this is the case. A marine ecologist, seeing that the coral reefs of her field sites are bleaching—turning white—might set out to understand why.

How do biologists follow up on these observations? How can you follow up on your own observations of the natural world? In this article, we’ll walk through the scientific method, a logical problem-solving approach used by biologists and many other scientists.

Explanation:

Answer:

Obtención. El carbono se encuentra - frecuentemente muy puro - en la naturaleza, en estado elemental, en las formas alotrópicas diamante y grafito. El material natural más rico en carbono es el carbón (del cual existen algunas variedades). Grafito: Se encuentra en algunos yacimientos naturales muy puro.

While secondary and tertiary alcohols react using the elementary SN1 mechanism, where no carbocation is created, primary alcohols react using the SN2 mechanism, which entails the production of a carbocation.

You can tell the type of alcohol by looking at the carbon atoms connected to OH.The alcohol is classified as primary, secondary, or tertiary depending on the number of carbons that are connected to that carbon.

Alkyl groups in tertiary alcohols supply the oxygen of the alcohol with electron density, which lessens the alcohol's acidic intensity.Thus, as the number of alkyl groups attached to a alcohol functional group on carbon grows, the acidity of alcohol decreases.

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Saturated NaCl is used to oxidize methoxybenzyl alcohol to methoxybenzaldehyde to facilitate the extraction of the product and improve the overall reaction yield.

In this oxidation reaction, an oxidizing agent (e.g., Dess-Martin periodinane, DMP) is used to convert methoxybenzyl alcohol to methoxybenzaldehyde. After the oxidation is complete, the reaction mixture contains both the product and the oxidizing agent. To separate the methoxybenzaldehyde from the reaction mixture, the mixture is poured into a separatory funnel containing saturated NaCl solution (brine). The brine serves to increase the ionic strength of the aqueous layer, which in turn, promotes the migration of methoxybenzaldehyde into the organic layer. This facilitates the extraction process, resulting in a higher yield of the desired product.

The use of saturated NaCl in the oxidation of methoxybenzyl alcohol to methoxybenzaldehyde aids in the extraction of the product, improving the overall reaction yield.

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Answered it coz of you

Any doubts just ping me

follow meh

Answer:

the answer is B

The equation M1V1 = M2V2 is used to solve problems related to dilution in chemistry

Given data in the question

intial concentration = 1.31 M

final concentration = ?

initial volume = 3 ml

final volume = 3ml + 5ml = 8 ml

Now we know that

M1V1 = M2V2

where

M1 initial concentration

M2 = concentration after mixing or diluting

V1 initial volume,

V2= total final volume

The equation M1V1 = M2V2 is used to solve problems related to dilution in chemistry

What is dilution?

It is process of decreasing the concentration of a solute in a solution, usually simply by mixing with more solvent like adding more water to solution.

M1V1 = M2V2

M2 = ( M1V1 ) / V2 = ( 1.31 × 3 )/ 8 = 0.491 mol/l

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Answer:

yes air is a mixture of many gases