How much heat is required to raise the temperature of 18 grams of liquid water by 25 C?

Aqueous potassium phosphate reacts with aqueous nickel(ii) bromide to produce solid nickel(ii) phosphate and aqueous potassium bromide. the correct option is a) true

The chemical reaction is given as follows :

K₃PO₄(aq)  +   NiBr₂(aq)   ----->   Ni(PO₄)₂(s)   +  KBr(aq)

the reaction is not balance to balance the chemical equation number of atoms in the product side is equals to the reactant side. so, multiply 2 in K₃PO₄ , 3 in NiBr₂ and 6 in KBr, we get :

2K₃PO₄(aq)  +   3NiBr₂(aq)   ----->   Ni(PO₄)₂(s)   +  6KBr(aq)

potassium      nickel bromide       nickel             potassium bromide

phosphate                                   phosphate

Now the above reaction is balanced. potassium phosphate reacts with  nickel(ii) bromide to produce nickel(ii) phosphate and potassium bromide.

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Because it is a stronger basic than hydroxide ion, it cannot persist in aqueous solution. Examples include ortho-diethynylbenzene dianion (C 6 H 4 (C 2) 2) and sodium hydride (NaH). A neutral base and neutral acid join together to form a bond and share an electron pair.

The three definitions of "base" used in chemistry are Arrhenius base, Bronsted base, and Lewis base. The fact that bases react with acids is acknowledged by all base definitions. Chemistry's definition of an Arrhenius base is a chemical that breaks down into hydroxide ions (OH-) in an aqueous solution. Qualities of a base. The ions in an aqueous base solution split apart to conduct electricity. Its pH level is higher than 7. As they interact with acids, salts are created.

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Answer: 12.7L

Explanation:

To solve this problem, we need to use the formula for concentration, which is C = m/V, where C is the concentration, m is the mass of the solute, and V is the volume of the solution. In this case, the concentration of salt in seawater is given, as well as the mass of salt that we want to recover, so we can solve for the volume of seawater by rearranging the formula to solve for V. The formula for V would be V = m/C.

Plugging in the given values, we get: V = 450 g / 35.5 g/L = 12.7 L

Rounding to three significant digits, the volume of seawater that must be evaporated to recover 450. g of salt is 12.7 L.

the volume of seawater that needs to be evaporated to recover 450 g of salt is approximately 12.7 L.

We need to use the given information and the concept of mass concentration to find the volume of seawater that needs to be evaporated.

The mass concentration of salt in seawater is given as 35.5 g/L. This means that in every liter of seawater, there are 35.5 grams of salt.

We want to recover 450 g of salt, so we can set up a proportion using the mass concentration:

35.5 g salt / 1 L seawater = 450 g salt / X L seawater

Solving for X (the volume of seawater), we can rearrange the equation:

X L seawater = (450 g salt) / (35.5 g salt / 1 L seawater)

X L seawater = 450 g salt × (1 L seawater / 35.5 g salt)

X L seawater = 12.676 L seawater

Rounding the answer to 3 significant digits, the volume of seawater that needs to be evaporated to recover 450 g of salt is approximately 12.7 L.

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Look below. When two amino acids are joined together, or when two amino acids condense, a dipeptide is created. Condensation occurs between the amine group of one amino acid and the acid group of another.

What is the photosynthesis chemical formula?

The carboxyl group on one amino acid and the amino group on the other combine to create a link, which results in the creation of a water molecule. What do you name a dipeptide that has been split into two amino acids?

The dipeptide is broken down into two ionised amino acids in the hydrolysis reaction depicted here with the addition of a water molecule. One amino acid receives a negative charge and an oxygen atom, whereas the second amino acid receives two hydrogen atoms.

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The ions Mg2+ and O2- that are connected by an ionic bond make up magnesium oxide MgO . However, since each molecule contains one mass atom of magnesium and one atom of oxygen.

We may infer from the valency that the net charge in each molecule is zero and balanced. As a result, magnesium oxide has the chemical formula MgO. Mass of a substance Equals number of moles (n) a substance's molar mass. Magnesium is a chemical element, but magnesium oxide is an ionic molecule, which is the major distinction between magnesium and magnesium oxide. One kind of magnesium that is frequently consumed as a dietary supplement is magnesium oxide.

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The proposed solution, which has 10.0 grams of glucose in 100 gram of water, has a freezing point of 1.034 C.

The degree of heat in which a liquid becomes solid. precisely the temperatures at which a material's solid and liquid states are balanced at atmospheric pressure.

If a substance is kept below its freezing point, it may either become more or less dangerous. The freezing point additionally offers an essential safety standard for evaluating the impacts of occupational exposure to cold conditions.

m = molality

i = van 'toff factor,

molality = n/w*t of solvent

n = w*t of Glucose/M* w t

= 10/180*1/0.1

=0.555 w* t

= 1.86*0.555*1

= 1.034

T (solvent) - d= 0-1.034

freezing point = -1.034C

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The heat of vaporization of nitrogen is 6,028.25 J/mol. The normal boiling point of nitrogen is 77.58 K.

The table for the question is in the attachment. Using the Clausius-Clapeyron Equation to estimate the heat of vaporization.

ln (P₁/P₂) = ΔH/R × (1/T₂ - 1/T₁)

where

ln (130,5/289,5) = ΔH/R × (1/70 - 1/65)

ln 0.45078 × 8.314 = ΔH × ((65 - 70)/4550)

- 0.79678 × 8.314 = ΔH × (- 5/4550)

- 6.6244 = ΔH × - 1/910

ΔH = - 6.6244 × - 910

ΔH = 6,028.2 J/mol

The normal boiling point reaches when pressure is 1 atm or 760 torr.

ln (760/1,718) = (6,028.2/8.314) × (1/85 - 1/T)

ln 0.4424 = 725.0662 × ((T - 85)/85T)

-0.81554 ÷ 725.0662 = ((T - 85)/85T)

- 0.001125 × 85T = T - 85

- 0.0956T = T - 85

- 0.0956T - T = 85

- 1.0956T = - 85

T = - 85 ÷ - 1.0956

T = 77.58 K

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This characteristic of matter is important in many areas of science and technology, including medicine, chemistry and engineering.

Illustration is a form of visual art that uses lines, shapes, and color to create a representation of an idea or message. It is often used by artists, designers, and illustrators to communicate ideas and stories, to create visual representations of a concept, to capture a moment in time, or to provide decoration.
This observation illustrates the characteristic of matter known as volume invariance, which states that when a substance is dissolved in a solvent, there is no change in the total volume of the mixture. This is due to the fact that the particles of the dissolved substance are distributed throughout the solvent, but remain the same size and shape as before. Therefore, the overall volume remains constant. For example, when 100g of sugar is dissolved in 200 mL of water, the total volume of the mixture is still 200 mL, as the sugar molecules are spread throughout the water. This characteristic of matter is important in many areas of science and technology, including medicine, chemistry and engineering.
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Cadmium. With the exception of potassium, harmful metal contaminants include chromium, lead, and mercury.

Individual metals and metal compounds that are toxic to humans' health, called "heavy metals," include both single metals and metal compounds. This page discusses certain poisonous semi-metallic elements, such as selenium and arsenic. Many of these metals are essential to life in extremely tiny quantities. But when consumed in greater quantities, they became poisonous. They might accumulate in biological systems and pose a serious risk to one's health. Technical and governmental information regarding hazardous metals can be found on this website as a starting point. As harmful metal contaminants, arsenic and beryllium are also present. An abundant yet uncommon element called cadmium is naturally present in the environment.

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465 grams of sugar If so, 300 grams of water ought to be able to tell you 3*155 grams of sugar. In 300 grams of water, there are 465 grams of sugar (3 x 155).

Traditionally, the dissolve editing method is used to segue between images that link two scenes together. Instead of a direct cut from one shot to the next, a dissolve gradually transitions from one image to the next.

Salt, sugar, and coffee are among the things that can dissolve in water. These objects disintegrate. Usually, they dissolve more easily and fast in warm or hot water. In hot water, but not at room temperature, sand and pepper are soluble.

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The Answer is Lead tetrachloride, PbCl4 is the molecular formula for lead tetrachloride, also known as lead(IV) chloride. It is a yellow, oily liquid that is stable below 0 degrees Celsius and decomposes at 50 degrees Celsius.  

It is tetrahedral in structure, with lead as the central atom. The covalent bond length of Pb-Cl is 247 pm, and the bond energy is 243 kJmol. Lead tetrachloride can be synthesised by reacting lead(II) chloride PbCl2 with hydrochloric acid HCl in the presence of chlorine gas (Cl2), yielding chloroplumbic acid H2PbCl6. By adding ammonium chloride, it is converted to the ammonium salt (NH4)2PbCl6 (NH4Cl). Finally, concentrated sulfuric acid H2SO4 is added to the solution to separate out the lead tetrachloride.

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Answer:

Density

Explanation:

Density is a physical property that describes the relationship between mass and volume. Density is the amount of matter in a given space, or volume.

Answer:

The relationship between the mass and volume of a substance is known as its density. Density is defined as the mass of a substance per unit volume. In other words, it is a measure of how much matter is packed into a given space. The density of a substance is determined by dividing its mass by its volume. For example, if a substance has a mass of 10 grams and a volume of 2 cubic centimeters, its density would be 10 grams / 2 cubic centimeters = 5 grams/cubic centimeter. Density is an important physical property of substances, as it can be used to identify and classify different materials and understand their behavior.

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Explanation:

Casting pewter involves tremendous temperatures, which makes it potentially highly dangerous.  Wearing safety gear like the kind pictured below is required, and taking all reasonable safety precautions is crucial.

Gases or scents that are toxic or offensive may be released during burning or thermal breakdown. Unusual Explosion and Fire Risks: When molten, water reacts violently with it.

Despite significant variations, 96% tin and 4% copper make up the majority of modern pewter. It is a soft metal, allowing for simple shaping with both hand and machine tools. A low melting point makes it suitable for casting (230 degrees, roughly).

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Answer:

Atomic theory

Explanation:

The atomic model is a representation of the atom.

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A mark, sign, or phrase is a symbol if it denotes, or is taken to denote, an idea, an object, or a relationship.

A symbol in literature is something that stands for or symbolizes another idea. A symbol can be almost anything, including an item, a mark, an image, a character, a name, or a location. A literary technique known as symbolism uses symbols to give a story significance.

A symbol is anything that stands for or represents anything else. A character, an action, a thing, or an animal can all have symbolic meaning in a story. These symbols frequently represent an abstract concept, such a force of nature, a global condition, or a notion.

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Answer:

Explanation:

To determine the freezing temperature of a solvent and solute mixture, you will need to use the freezing point depression equation. This equation allows you to calculate the change in freezing point of a solvent caused by the addition of a solute.

The freezing point depression equation is:

ΔTf = Kf x molality

where:

ΔTf is the change in freezing point of the solvent in degrees Celsius

Kf is the freezing point depression constant for the solvent, which is a specific value for each solvent and is usually provided in a table or chart

molality is the concentration of the solute in the solvent, expressed in mol/kg

To use this equation, you will need to know the volume and density of the solvent and solute, as well as the molecular weight of the solute. You can then use these values to calculate the molality of the solute in the solvent.

For example, let's say you have a mixture of 100 mL of water (solvent) and 10 g of salt (solute). The density of water is 1 g/mL and the molecular weight of salt is 58.44 g/mol.

To calculate the molality of the salt in the water, you can use the following steps:

Calculate the mass of the solvent: 100 mL x 1 g/mL = 100 g

Calculate the molality of the solute: 10 g / 58.44 g/mol = 0.171 mol

Calculate the molality of the solvent: 0.171 mol / 100 g = 0.00171 mol/g

Once you have calculated the molality of the solute in the solvent, you can use the freezing point depression equation to calculate the change in freezing point of the solvent caused by the addition of the solute.

For water, the freezing point depression constant (Kf) is 1.86 °C/m. Therefore, the change in freezing point caused by the addition of the salt to the water would be:

ΔTf = 1.86 °C/m x 0.00171 m = 0.00316 °C

This means that the freezing temperature of the solvent and solute mixture would be 0.00316 °C lower than the freezing temperature of pure water, which is 0 °C. Therefore, the freezing temperature of the mixture would be -0.00316 °C.

I hope this helps! Let me know if you have any questions or need further clarification.

Answer: [tex]C_2H_5[/tex]

The given compound is a carboxylic acid with a hydroxyl group. The IUPAC name of the following compound is 2-hydroxyhexanoic acid.

IUPAC states certain rules to to name the organic compounds. Firstly the name of the compound is based on the number of carbon atoms in  the longest chain.

The carbon atoms with the functional groups attached are numbered in such a way that, they have the small numberings. The functions groups are named with their suffix or prefix.

The given compound is a carboxylic acid with the group COOH. The long chain contains 6 carbons and a hydroxyl group is there in the second carbon. Hence, its name is 2-hydroxy hexanoic acid.

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Enzyme-catalyzed reactions happen in two steps.

1. Enzyme molecules and substrate molecules collide.

2. The formed enzyme-substrate molecule will catalyze and form a product and enzyme

In step one, the enzyme molecule (E) and substrate molecule(s) will collide, and they react, forming the intermediate compound, which is called "the enzyme-substrate" (E-S) complex. (The step is reversible since the complex breaks apart into the original substrate(s) and free enzyme).

In step two, after E-S complex forms, the enzyme will catalyze forming a product (P) and later be released from the enzyme's surface.

S + E → E–S

E–S → P + E

Hydrogen bonding and other electrostatic interactions will hold the substrate and enzyme together in a complex. The functional groups or structural features in the enzyme that participate in the interactions will be located in the pocket or cleft on the enzyme's surface. The pocket where enzymes combine with a substrate and transform it into a product is called the enzyme's active site. It has a unique conformation, complementary to the substrate structure, for the substrate and enzyme molecules to fit together similarly as the key in tumbler locks.

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Answer:

a recycling bins

Explanation:

it's the easiest to do and to follow

An easy and sustainable way for campuses to reduce waste is recycling bins. Therefore, option A is correct.

Before being transported to recycling facilities, recyclables are stored in recycling bins. For usage inside and outside of residences, workplaces, and big public venues, recycling bins come in a variety of sizes.

The recycling bin's goal is to gather items that might have otherwise ended up in landfills. These items are frequently processed again to create new items. There are various items that can go in a recycling container. Papers, metal scraps, periodicals made of plastic, discarded gadgets, and a variety of other items are all acceptable.

The collection of used newspapers and magazines for recycling and their conversion into new paper products is an illustration of external recycling. Glass bottles and aluminum cans are two further examples of common items that are extensively recycled outside.

Thus, option A is correct.

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The answer to the Two kg of aturated aqueous olution of a highly oluble component A at 50 °C i cooled of A are (0. 5 kg 4)/(kgwater) at 50 °C and to 30 °C. for the crystal are 0.07.

The salt crystals that lose their water of crystallization on heating are referred to as anhydrous crystals.

Here we have the

2 kg of solution * (0, 5 kgA)/(4kg of water =0.15 kgofA

1 kg of solution * (0, 5 kgA)/(4kg of water =0.075 kgofA

Thus, the quantity of anhydrous crystal

are popping out of the answer that is cooled from eighty deg * C to 30 deg * C are: 0.15 - kg of A - 0.075kg of A = 0.07 kg of crystal.

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Answer: Washing your hands with soap, and hand sanitizer.

Explanation:

Answer: Alternating is the first one, and direct is the second one.

Explanation:

Ionic compounds are defined as the compounds that are made up of ions that form charged particles when an atom (or group of atoms) gains or loses electrons. Some important properties of ionic compounds are discussed below.

Ionic compounds are basically formed between elements that are metals and elements that are nonmetals. For example, let's take the metal calcium (Ca) and the nonmetal chlorine (Cl) form the ionic compound calcium chloride (CaCl₂). In this ionic compound, two negative chloride ions (anions) are present for each positive calcium ion (cations).

Properties of ionic compounds are given as:

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Answer: butter melts

Explanation:

The right molecular orientation and sufficient energy to overcome Ea are necessary for one collision amongst reaction to be successful.

The vehicular accident, human crash, and internal collision are the three steps that every collision goes through, which you may not have known.

Regardless of who was at fault, coverage provides compensation to fix or replace your automobile if it is damaged or damaged in a collision with another vehicle. That's not the same as liability insurance, which assists in covering damage to that other user's vehicle as a result of a collision you caused.

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The freezing point depression of the solution will be ΔTf = 1.86°C/m × 0.1 mol/kg = 0.186°C.

Dissolved is a term used when a solid is broken down into small particles and dispersed in a liquid. When a solid is dissolved in a liquid, the solid particles no longer exist as separate entities. Instead, the solid particles are distributed evenly throughout the liquid. Dissolution is a common process in chemistry and is used in many everyday applications, such as drinking soda or adding sugar to coffee.

The freezing point depression of a solution containing 6 g of urea dissolved in 1000 g of water can be calculated using the formula ΔTf = iKf m, where ΔTf is the freezing point depression, Kf is the cryoscopic constant for water (1.86°C/m), and m is the molality of the solution. The molality of the solution can be calculated as m = (6 g/60 g/mol)/(1000 g/1000 mL) = 0.1 mol/kg. Therefore, the freezing point depression of the solution will be ΔTf = 1.86°C/m × 0.1 mol/kg = 0.186°C.

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