Which of the following is NOT an ionic compound?
A. Carbon Dioxide
B. Lithium Oxide
C. Barium Oxide
D. Calcium Chloride

"Salt lowers water's freezing point" is correct. Utah's Great Salt Lake never freezes because of its high salt content. Salt dissolves in water, reducing its freezing point. The correct answer is option c.

Salt ions prevent water from freezing. Salt's freezing point depression keeps Great Salt Lake water liquid at cold conditions.

The Great Salt Lake in Utah doesn't freeze in winter because salt lowers the freezing point. The freezing point of pure water is 0 degrees Celsius (32 degrees Fahrenheit), however when salt is dissolved in water, it disturbs ice crystal formation and prevents freezing. Sodium ions (Na+) and chloride ions (Cl-) make up salt. When salt dissolves in water, these ions separate and surround water molecules. This is hydration.

Water molecules' hydrogen bonding is affected by salt. Hydrogen bonding links water molecules to produce ice crystals. The hydrogen bonding network is disrupted by salt, making it harder to create ice crystals. Because of this, the Great Salt Lake stays liquid even in cold winters. The Great Salt Lake's salt lowers the freezing point through influencing hydrogen bonding between water molecules.

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Answer:

There will be 4 moles of NO2 produces at the end of the reaction.

Explanation:

First of all, you should consider that the limiting reactant is NO, since it's the first it's going to end in the reaction.

After that, the conversion factor must be done with the limiting reactant (NO). So since you have 4 mol of NO and the relation of NO with NO2 its 2:2, you will end up having 4 moles of NO2.

Molecules or ions which can either donate or accept a proton, depending on their circumstances, are called amphiprotic species. The most important amphiprotic species is water itself.

An amphoteric substance in chemistry is a molecule or ion that reacts as both an acid and a base. Depending on whose definitions of acids and bases are being used, this could signify a variety of things. The Greek prefix amphi, which meaning "both," is whence the word "amphoteric" gets its prefix.

Amphiprotic molecules, which have the ability to either donate or absorb a proton (H+), are one kind of amphoteric species. In the context of Brnsted-Lowry acid-base theory, this is what "amphoteric" means. Examples include self-ionizable molecules like water and amino acids and proteins, which have amine and carboxylic acid groups.

Amphoteric compounds called ampholytes have both acidic and basic groups.

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Answer:

Hydrochloric acid (HCl) acts as an acid, and iron filings (Fe) act as a metal. Acid reacts with the metal to produce iron chloride (FeCl2) and hydrogen gas (H2) as products.

Explanation:

When dilute hydrochloric acid (HCl) is added to iron filings (Fe), a chemical reaction takes place. The reaction can be represented by the following equation:

Fe + 2HCl → FeCl2 + H2

In this reaction, the hydrochloric acid (HCl) acts as an acid, and the iron filings (Fe) act as a metal. The acid reacts with the metal to produce iron chloride (FeCl2) and hydrogen gas (H2) as products.

The iron filings react with the hydrochloric acid to form iron chloride. Iron chloride is soluble in water and dissociates into Fe2+ ions and Cl- ions. The release of hydrogen gas is observed as effervescence or bubbling.

The reaction between hydrochloric acid and iron filings is an example of a single displacement reaction, where the more reactive metal (iron) displaces the less reactive hydrogen from the acid. This type of reaction is often referred to as a metal-acid reaction.

It's important to note that this reaction is highly exothermic, meaning it releases heat. Therefore, if a large amount of acid is added to a large quantity of iron filings, the reaction can become vigorous and potentially dangerous, leading to the release of significant amounts of hydrogen gas. It is recommended to carry out such reactions under controlled conditions and with appropriate safety precautions.

Answer:

Iron chloride.

Concepts in the given question:

Iron filings undergo a chemical reaction that results in the production of hydrogen gas and iron chloride when diluted hydrochloric acid is introduced. According to the following equation, the iron filings and hydrochloric acid react to produce ferrous chloride and hydrogen gas:

Fe(s) + 2HCl(aq) → FeCl2(aq) + H2(g)

The reactants in this reaction are iron filings (Fe), and the reagent is hydrochloric acid (HCl). Iron interacts with acid to produce iron chloride (FeCl2) and hydrogen gas (H2) when the two are mixed. While the hydrogen gas is discharged as a gas, the iron chloride dissolves in the acid and creates a solution. Exothermic, or releasing heat, the reaction happens rather fast, especially if the iron filings are broken up into little bits or have a wide surface area.

Hydrochloric acid can react with several metals to produce hydrogen gas and a metal chloride. However, not all metals will react with hydrochloric acid.

Metals that are more reactive than hydrogen, such as sodium (Na), potassium (K), calcium (Ca), and magnesium (Mg), will react with hydrochloric acid to produce hydrogen gas and a metal chloride. For example:

2Na(s) + 2HCl(aq) → 2NaCl(aq) + H2(g)

Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g)

However, metals that are less reactive than hydrogen, such as copper (Cu), silver (Ag), and gold (Au), will not react with hydrochloric acid.

It is worth noting that the rate and extent of the reaction can vary depending on the concentration and temperature of the acid and the type of metal being used.

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We must use a solubility chart or graph specifically for NaNO3 to ascertain the solubility of NaNO3 in 250 grammes of water at 10°C. The amount of solute (NaNO3) that can dissolve in 100 grammes of water at a specific temperature is used to measure the solubility of NaNO3.

We may use a ratio to get the solubility in 250 grammes of water by assuming that the solubility of NaNO3 in water at 10°C is 90 grammes per 100 grammes of water:

90 g NaNO3 to 100 g water equals x g NaNO3 to 250 g water.

After cross-multiplying and finding x, we obtain:

250 grammes of water with 225 grammes of sodium nitrate equals x.

As a result, 250 grammes of water at 10°C can dissolve around 225 grammes of NaNO3.

The temperature at which 25 grammes of HCl will dissolve into a saturated solution in 50 grammes of water is required to answer the second question. Understanding how HCl dissolves in water at various temperatures is necessary for this.

The solubility of HCl in water is normally expressed in terms of grammes of solute per 100 grammes of water, despite the fact that it is a highly soluble molecule. The maximum concentration in mol/L at a specific temperature is typically supplied as an alternative.

Without specific solubility data, it is not possible to provide an accurate temperature at which 25 grams of HCl would create a saturated solution in 50 grams of water. Additional solubility information is needed to make a precise determination.

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The number of ionic bond in copper is zero.

Pure copper or any pure metal for that matter are examples of metallic bonds, which are neither ionic nor covalent. The copper atoms are stacked very tightly in a solid lattice. In fact it has a face centered cubic lattice which is the closed packing of atoms possible. Each atom has twelve nearest neighbors which allows their 4s orbitals (mostly) to have the optimal overlap. All of these orbitals therefore combine in one gigantic band of delocalized orbitals that spans the entire crystal with its myriad atoms. This band is only partly filled and the difference in energy between one state and the next is puny, which explains copper’s outstanding conductive properties.

Therefore, the bonding in copper has a metallic character.

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Answer:

Noble Gases B

Explanation:

The noble gases are the chemical elements in group 18 of the periodic table. They are the most stable due to having the maximum number of valence electrons their outer shell can hold. Therefore, they rarely react with other elements since they are already stable.

Answer:

Boiling, melting

Explanation:

Physical changes affect the form of a chemical substance.

option (c) emulsion is the right answer

Emulsion is a classification of milk.

In physical chemistry, an emulsion is a combination of two or more liquids in which one of the liquids is present as microscopic or ultramicroscopic droplets dispersed throughout the other.

Emulsions form as a result of the cleansing action of soaps.

(ii) The emulsification process is how lipids are broken down in the intestines.

(iii) Disinfectants and antiseptics combine with water to generate emulsions.

(iv) The emulsification technique is utilized to create medications.

When two immiscible liquids, such as oil and water, are stirred together with an emulsifier—which might be a protein, phospholipid, or even a nanoparticle—emulsion is created.

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Answer:

when the atom is neutral

Explanation:

Answer:

Explanation:

In thermodynamics, there are three types of systems and they include:

The closed system is capable of exchanging only energy within its surroundings.

An open system is capable of exchanging both energy and matter within its surroundings.

While an isolated system cannot exchange either matter or energy within its surroundings.

There is nothing like a shared system in thermodynamics.

Answer:

0.583M

Explanation:

M = CV

C is concentration in grams.

V is the volume.

Remember to convert mL to Litres.

The ion of the element from above which has the greatest ionic radius is S²- ( sulphur ion )

The correct answer choice is option b.

It follows that distance between the nucleus of an ion to that till that point it influence on its electron cloud, is referred to as the ionic radius of an ion of an element. Within the context of this task, the atomic radius of sulphur ion is 184 ppm.

Furthermore more, this periodic trend of elements, that is, the ionic radius decreases across the period but increases down the group.

So therefore, we can correctly deduce from the explanation above that S²- has the largest ionic radius.

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The object with the greatest gravitational pull is the Earth (option D).

Gravitational force is a very long-range, but relatively weak fundamental force of attraction that acts between all particles that have mass. It is believed to be mediated by gravitons.

Newton’s Law of Universal Gravitation states that every particle attracts every other particle in the universe with force directly proportional to the product of the masses and inversely proportional to the square of the distance between them.

The force of gravitational attraction is directly dependent upon the masses of both objects and inversely proportional to the square of the distance that separates their centers.

So as the mass of either object increases, the force of gravitational attraction between them also increases. If the mass of one of the objects is doubled, then the force of gravity between them is doubled. If the mass of one of the objects is tripled, then the force of gravity between them is tripled.

According to this question, Earth has the highest mass among the listed objects, hence, in accordance to the law of universal gravitation, Earth will possess the greatest gravitational pull.

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Answer:

Explanation:

because ethanoic acid dissocaites into H+ and actetate ion so there is positive and negative chaeges to carry the electrons while ethanol only got evenly distributed in the water.

Answer:

Compound: A substance that is made up of more than one type of atom bonded together.

Mixture: A combination of two or more elements or compounds which have not reacted to bond together; each part in the mixture retains its own properties.

Explanation:

The different substances in a mixture are not chemically combined, whereas the different elements in a compound are. The atoms do not combine in the mixture, but they combine when they form a compound.

Answer:

b

Explanation:

Answer:

ita b

Explanation:

trust fam

Isotopes undergo radioactive decay because thermodynamics generally governs the situation. Every atom strives to have the greatest degree of stability. When the number of protons and neutrons in the atomic nucleus is out of balance, instability results in radioactive decay. In essence, the nucleus contains too much energy to keep all the nucleons together.

Radioactive decay a the spontaneous process through which an unstable atomic nucleus breaks into smaller, more stable fragments.

Three Types of Radioactive Decay:

Alpha Decay:

       When an alpha particle basically a helium nucleus with two protons and two neutrons is ejected, the parent's atomic number and mass number are reduced by two and four, respectively.

Beta Decay:

      A stream of electrons from the parent, known as beta particles, is released during beta decay, and a neutron in the nucleus is changed into a proton. The new nucleus has the same mass number, but an additional atomic number of one.

Gamma Decay:

        The atomic nucleus releases extra energy during gamma decay in the form of high-energy photons (electromagnetic radiation). The resultant nucleus takes on a more stable energy state while maintaining the same atomic number and mass number.

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Answer:

NO2

Explanation:

N = Nitrogen

O = Oxygen

Answer:

NO. 2.

is the answer

hopes this helps

The response is C. 400mL of 5% glucose solution requires 20g of glucose to make.

To prepare 400mL of 5% glucose solution, we need to determine the amount of glucose required.

5% glucose solution means that 5g of glucose is present in 100mL of the solution.

Therefore, for 400mL of the solution, the amount of glucose required can be calculated as:

5g glucose/100mL solution = x g glucose / 400mL solution

x = (5g glucose/100mL solution) x (400mL solution) = 20g glucose

Therefore, the answer is D. 20g of glucose is needed to prepare 400mL of 5% glucose solution.

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There is only one sodium ion for every chlorine ion due to its valency.

The number of electrons that an atom needs to lose or gain in order to achieve a stable electron configuration i.e the octet of an element is known as the valency of an element, which serves as a gauge of that element's potential for combining.

The valency of Sodium (Na) is 1 and that of chlorine (Cl) is also one. therefore they combine to form a stable compound. The same rule follows in the compound formed by Potassium (K) and Oxygen(O) also. The valency of oxygen is 2 which means that it should be surrounded by 2 potassium ions to provide electrons to fulfill both the elements' octets.

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The purpose of the calibration curve is to determine the concentration of a solution.

It is absolutely necessary for this experiment because it establishes a relationship between the measured response of an instrument (e.g., absorbance) and the concentration of the analyte. This relationship allows for the quantification of unknown samples based on their measured response.

In many analytical experiments, such as spectrophotometric analysis, the concentration of a solution is determined by measuring a physical property, such as absorbance or fluorescence. However, the instrument response alone does not provide the concentration information. The calibration curve is created by analyzing a series of standard solutions with known concentrations of the analyte.

By plotting the measured instrument response (e.g., absorbance) against the known concentrations, a linear relationship or a curve can be established. This calibration curve serves as a reference or standard to determine the concentration of unknown samples by comparing their instrument response to the curve.

Without the calibration curve, it would be impossible to accurately quantify the concentration of the analyte in the unknown samples. Thus, the calibration curve is essential for obtaining accurate and reliable results in the experiment.

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Answer:

D

Explanation:

because it has two or more properties

Answer:

A

Explanation:

The molecules in both metal and surrounding air will start moving slower because of the sudden decrease in environment tmeperature. The thermal energy around the metal plate decreases, also decreasing the kinetic energy.

The addition of a saturating concentration of L-NMMA to a relaxing aortic ring with intact endothelium would probably affect the synthesis of NO. L-NMMA is a competitive inhibitor of nitric oxide synthase (NOS), which is the enzyme responsible for the synthesis of NO. By inhibiting NOS, L-NMMA would prevent the production of NO, leading to a decrease in its concentration in the aortic ring.

Nitric oxide (NO) is continuously synthesized in the body, and it plays a crucial role in regulating blood Nitric oxide (NO) is continuously synthesized in the body, and it plays a crucial role in regulating blood vessel tone and promoting vasodilation. In the presence of intact endothelium, the endothelial cells release NO, which diffuses to the underlying smooth muscle cells of the blood vessels and causes relaxation.

L-NMMA (N-monomethyl-L-arginine) is a competitive inhibitor of the enzyme nitric oxide synthase (NOS), which is responsible for the synthesis of NO. When a saturating concentration of L-NMMA is added to a relaxing aortic ring with intact endothelium, it would likely inhibit the activity of NOS. As a result, the production of NO would be decreased, leading to vasoconstriction and a decrease in the relaxation of the aortic ring.

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Answer:

The correct answers are:  decrease and decrease.

Explanation:

Phytoplanktons are the producers in this ecosystem while marsh snails are the primary consumers and painted turtles are the secondary consumers. It is known that the producers affect direct or indirect to all other trophic levels and it is also known that in the food chain decrease in the producer or bottom of the chain will affect all.

The numbers of marsh snails will decrease due to its food source and as painted turtles depend on marsh snail the population of these also decrease as marsh snails are the primary food source of the painted turtles.

Answer:

1and1

Explanation: