You are conducting a calorimetry experiment using a calorimeter with 500mL of water in its outer chamber to determine the enthalpy of reaction of a chemical reaction. The initial temperature of the water is 25°C. After the reaction, the temperature of the water is 62. 8°C. Disregarding any heat loss to the walls of the container, calculate the ΔHr0. The specific heat of water is 4. 18J/(g•K)

Answer:

Number 2 is Direction

Explanation:

The old answer for number four was incorrect

I apologize for the inconvenience but I do not have an answer that fits in the lines for number 4

Answer:

Ba(ClO)₂

Explanation:

The compound formed from barium and hypochlorite is barium hypochlorite, and its chemical formula is Ba(ClO)₂.

A chemical element with the atomic number 56 is barium (Ba). It belongs to the alkaline earth metal family and when it forms compounds, it has a 2+ charge.

This indicates that two electrons must be rapidly lost by barium in order to produce a stable electron configuration.

One chlorine atom (Cl) and one oxygen atom (O₂) combine to form the anion hypochlorite (ClO-) (O). The hypochlorite ion has a net charge of -1 due to the 1-charged oxygen atom and the 1-charged chlorine atom.

The 2+ charge of barium interacts with the 1- charge of the hypochlorite ion throughout the reaction to create a neutral molecule.

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Answer:

diffusion is the movement of gases from a higher concentration area to a lower concentration area

osmosis is the movement of water molecules from a higher concentration area to a lower concentration area

Aqueous solution of HCl is 36.0 % by mass and has a density of 1.10 g/mL. The molarity, molality and mole fraction of HCl is 0.9868 M ; 15.42 m ; and 0.217

The solution can be calculated as follows:

Molarity (M) = Number of moles of solute (HCl) / Volume of solution in liters (L)The density of the solution = 1.10 g/mL

Therefore, 1 L of solution weighs 1.10 x 1000 = 1100 g

The mass of HCl in 100 g of solution = 36 g

Number of moles of HCl in 36 g = 36 / 36.46 = 0.9868 mol

Molarity = Number of moles / Volume of solution = 0.9868 / 1 = 0.9868 M

Molality (m) = Number of moles of solute / Mass of solvent (kg)

The mass of solvent in 100 g of solution = 100 - 36 = 64 g

Molality = Number of moles / Mass of solvent (kg) = 0.9868 / 0.064 = 15.42 m

Mole fraction (X) = Number of moles of solute / Number of moles of solute + Number of moles of solvent

Number of moles of solvent in 100 g of solution = 64 / 18 = 3.56 mol

Number of moles of HCl in 100 g of solution = 0.9868

Mole fraction of HCl = Number of moles of HCl / (Number of moles of HCl + Number of moles of solvent) = 0.9868 / (0.9868 + 3.56) = 0.217

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The decomposition of calcium carbonate is an endothermic reaction.

The given equation for the decomposition of calcium carbonate is:

CaCO₃ → CaO + CO₂

ΔH = +110 kJ/mol

where ΔH is the enthalpy change for the reaction.

The positive value of ΔH in the equation indicates that the reaction is endothermic, meaning that heat is absorbed by the reactants from the surroundings during the reaction. This means that the reaction requires an input of energy to proceed, and the products (CaO and CO₂) have higher potential energy than the reactant (CaCO₃).

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--The complete question is, Calcium carbonate decomposes in this balanced equation:

CaCO3 + CaO + CO2 ΔH = +110 kJ/mol

Is this reaction endothermic or exothermic?--

Answer:Plasma is highest energy state of matter.It consists of electrons,protons and neutral particles.

Explanation:(1) Plasma has a very high electrical conductivity .

(2) The motion of electrons and ions in plasma produces it's own electric and magnetic field

(3)It is readily influenced by electric and magnetic fields .

(4)It produces it's on electromagnetic radiations.



Answer:

monkey

Explanation:

cause that's what u r

The concentration on lead will be 47.25 × 10⁻³ g/L

Molarity also known as molar concentration refers to the number of moles of solute per liter of solution. The formula for molarity is: M = n /v.

According to the given question:

M₁ = \(\frac{n}{V_{1} }\)

V₁ = 81 ml or 81 × 10⁻³ ( volume of solution)

M₁ = 63 × 10 ⁻⁶

Since, M₁V₁ = M₂V₂

=  63 × 10⁻⁶ × 81 × 10⁻³ = M₂ × 108 × 10⁻³

M₂ = 47.25 × 10⁻³

Hence, the molar concentration of lead for the new volume will change to 47.25 × 10⁻³ g/L

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Answer:

9

Explanation:

- When constructing the Lewis structure as mentioned in the question we must first construct the skeleton with Br as the center atom and F surrounding it.

- Next we count the number of electrons on each atom in this case

Br - 7

2F - 7×2

In total we have 21

but because of the + charge in the final molecule we remove one electron in order to get the + charge so we have 20 electrons now

- Now we know we've already used up 2 pairs to join the Br and F atoms together so we're left with 8 more pairs, we start by distributing the electron pairs first to the F atoms and then give the remaining to the Br atom

- Br should 7 electrons ideally so here we see it'll have only 6, therefore Br gets the + charge

- Next just count the no of pairs and viola you have your answer which is 9

(Attached is the final structure of BrF2+)

1. Ammonia is a colorless gas with a chemical formula of NH3, when it comes in contact with water, it will be transformed into Ammonium ion and it will produce one hydroxide ion, and this is why Ammonia will present a more basic (pH) behavior, the reaction that represents this behavior is:

NH3 + H2O -> NH4+ + OH-

Number 4 is the only one that represents it well

Number 3 has the same reaction but since there is a plus sign instead of an arrow, I consider it wrong.

Answer: No

Explanation:

To produce one molecule of glucose, 6 molecules of carbon dioxide (\(CO_{2}\)), 18 molecules of adenosine triphosphate (ATP), and 12 molecules of nicotinamide adenine dinucleotide phosphate (NADPH) are required.

Glucose, a six-carbon sugar, is synthesized through the process of photosynthesis in plants. It involves the Calvin cycle, which incorporates carbon dioxide, ATP, and NADPH to produce glucose. For each molecule of glucose formed, 6 molecules of carbon dioxide are required.

The energy needed for glucose synthesis is provided by ATP, which is an energy-rich molecule. In the Calvin cycle, the synthesis of one glucose molecule requires 18 molecules of ATP.

NADPH, a coenzyme involved in energy transfer reactions, is required for the reduction of carbon dioxide during the Calvin cycle. In the process, 12 molecules of NADPH are utilized to produce one molecule of glucose. These components play crucial roles in capturing and storing energy, as well as providing carbon atoms for the formation of glucose, which serves as a vital energy source for organisms.

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Answer:

B. Water vapor transfers back to water droplets or ice crystals.

Explanation:

Its What I know ehe sorry in advance if its wrong :))

Answer:

0.7 is the right

Explanation:

Here, we have to draw the main organic products of a given bimolecular substitution reaction and the curved arrow mechanism of the reaction.

(Answer is attached in the picture)

Substitution reactions involve the replacement of one functional group in a molecule by another functional group. Nucleophilic substitution reactions involve a nucleophilic reagent with a substrate that has a positively or partially positively charged portion of the molecule (electrophile).

An electrophile is an atom or molecule that lacks electrons. In organic reactions, electrophiles act as electron acceptors (Lewis's acids). These reagents can be cations or neutral molecules that have relatively positively charged atoms.

Meanwhile, a nucleophile is an atom or molecule that is rich in electrons. The nucleophile has an electron pair that can be donated (a Lewis base). Some nucleophiles are neutral molecules that have a PEB and some are negatively charged. In a chemical reaction, electrons from the nucleophile strike the electrophile center to form new bonds as a result of the reaction.

On the question:

Use of curved arrows to indicate: A broken or formed bond.

Electron layer protective layer arrow

In the reaction of this problem, I replaced Br (Substitution) and Br bonded with Na⁺.

The nucleophile "replaces" the leaving group.

Called a substitution reaction: I replace Br (change places).

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Answer:

2HBr + Ba(OH)2 = BaBr2 + 2H20

The balanced chemical equation of hydrogen bromide and barium hydroxide is 2 HBr + Ba(OH)₂ = BaBr₂ + 2 H₂O.

Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.

A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .

The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.

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Answer:

collectively they're known as HYDROCARBONS

Because it provides a very high concentration compared to what is possible with saline.

A high chloride ion concentration shifts the equilibrium position to the right due to Le Chatelier's principle.

Uses of HCL -

Hydrogen chloride is produced when many plastics are burned. Acute (short-term) inhalation exposure in humans can cause eye, nose, and respiratory tract irritation and inflammation, and pulmonary edema.

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All the units listed in the question can be valid units for a reaction rate, except for the unit of grams per second (g/s). Reaction rate is defined as the change in concentration of a reactant or product per unit time. It is usually expressed in units of mol/L-time, where time can be in seconds, minutes, or hours.

The unit of M/s (molarity per second) is often used for expressing the reaction rate, especially in kinetics studies. The unit of mol/L-hr (molarity per hour) is also a valid unit for expressing the reaction rate, as it represents the change in concentration per unit time.

The units of mol/hr (moles per hour) and mol/L (molarity) are also used to express the reaction rate. However, the unit of g/s is not a valid unit for a reaction rate, as it represents the mass of a substance per unit time, rather than the change in concentration per unit time.

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Answer:

phosphorus monoxide

Explanation:

coz there's one one oxygen molecule and mono means 1.....

Answer:

Earthquake...

Explanation:

I mean, its kinda the only one that makes sense aha

And took test!

The word earthquake identifies the shaking that results from movement under Earth's surface.

Hence, option 1 is the answer.

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Group 1 elements will be more reactive than group 2 because group 1 element has one valence electrons.

The kind of elements which posses 1 valence electrons, will  be kept in group 1. Due to it has 1 valence electrons, hence it will be more reactive.

In a group, by moving top to down in the periodic table reactivity increases.

Reactivity would be a parameter that expresses how easily a substance reacts chemically. The chemical may react alone or in combination with some other atoms or molecules, and energy is often released as a result of the reaction. The most reactive substances and elements have the potential to spontaneously as well as explosively ignite.

Therefore, group 1 elements will be reactive than group 2 elements.

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Answer:

Nonpolar

Explanation:

Well, \(SiBr_4\) or better known as silicon tetrabromide,  is considered nonpolar.

To start,

Polar covalent bonds are a common component of polar molecules, which are covalent chemical compounds. Due to an uneven distribution of bonding valence electrons caused by varying electronegativity values in the connecting atoms, these bonds have partial charge separation. A dipole moment that is directed in a certain direction is represented by each polar covalent link. According to VSEPR theory, the complex itself has a certain molecular geometry at the center atom. Because of this geometry and the polar covalent bonds, the compound itself may occasionally exhibit a net dipole moment.

To put this simply,

Because bromine is more electronegative than silicon, each covalent link between Si and Br is polar. The shape of the molecule, however, prevents it from being polar. In other words, its geometry.

Here is some information of the SiBr4 Lewis Structure, Geometry, Hybridization, and Polarity.

Tetrabromosilane, often known as silicon tetrabromide, is an inorganic molecule in which one Si atom and four Br atoms are covalently connected. It is produced using silicon and bromine vapors at temperatures over 600 °C. SiBr4 is a colorless liquid with an extremely oppressive smell. Its capacity to hydrolyze and emit HBr gas, which has an unpleasant odor, as demonstrated in the equation, is the reason of this distinctive stench.

SiBr4  +  2H2O  →  SiO2  +  4 HBr

Thanks.

Rain freezing is a condition of "exothermic" process. The freezing rain emits thermal energy, which is then transmitted to the earth. The earth will receive thermal energy if the rain loses thermal energy. As a result, the ground's temperature rises.

Due to the salt in saltwater, it freezes at a lower temperature than fresh water, approximately 28.4 degrees Fahrenheit (ca. -2 °C). However, because only the water portion of saltwater freezes, very little salt is present in the ice when it is formed. Water may be made from it by melting it down.

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Answer:

Chemical Change

Explanation:

apples turn brown because of a chemical reaction named oxidation which is cause by oxygen of the air

Oxygen is one of the most reactive chemicals known to exist.. There are a variety of oxidation reactions .. The fridge does not stop chemical reactions so bacteria will still rot the food eventually and out side of the fridge it would rot quicker than the fridge .

Answer:

Chemical change

i got it right

Explanation:

As a pure element, the oxidation number of magnesium (Mg) is 0. However, in compounds such as MgCl2, its oxidation number is +2. Therefore, the correct answer is +2, 0.

The total amount of electrons that an atom acquires or loses in order to create a chemical connection with another atom is known as the oxidation number, also known as the oxidation state. Magnesium and oxygen therefore undergo an oxidation-reduction process.

The metal ion cofactor that is by far the most common in enzyme systems is magnesium. The capacity of the metal ion magnesium to form stable complexes with phosphate-containing species, such as ATP, which is often paired with the metal ion when functioning in a physiological setting, is most likely responsible for this.

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Answer:

Convection currents are a circular current caused by the difference in temperatures from the bottom to the top of the mantle. It is because of these currents that the plates of the Earth have moved in the past and are moving today. These plate movements cause earthquakes, mountain building, and volcanism.

Explanation: