Iron (III) bromide reacts with sodium hydroxide to produce iron (III) hydroxide and sodium bromide. Write the balanced chemical equation in the box.

The student's task is to determine the density of the four mystery liquids using the mass and volume measurements.

Density is a physical property that describes the amount of mass per unit volume.

The formula for density is density = mass/volume. Once the density of each liquid is determined, the student can compare it to known densities of different substances to identify the liquid.

This information can be useful in various fields such as chemistry, pharmacology, and environmental science.

The student may also use this data to calculate other properties of the liquids such as viscosity, surface tension, and boiling point. Overall, measuring mass and volume is a fundamental method in scientific research and analysis.

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Answer:

The periodic table

Explanation:

I'm not really sure what your question is. . . I'm assuming this is what you're looking for

In double replacement reactions, two metals not combine with each other when products are formed because, metals form negative ions and like charges attract. Therefore, option A is correct.

A metal is a substance that exhibits a shiny appearance when freshly processed, polished, or shattered, and conducts electricity and heat rather well. Generally speaking, metals are malleable and ductile.

We use the (s) symbol for solid because salt is an insoluble substance that will not dissolve in water. The silver, fluoride, potassium, and chloride ions would have effectively moved to a new location if there had been no precipitate formation, but they would still be floating around as ions. In this instance, nothing happens.

When two ionic compounds exchange ions and create two new ionic compounds, this is known as a double replacement reaction.

Thus, option A is correct.

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Answer:

a

Explanation:

everything can be broken down to a smaller less useful compounds but never destroyed

Answer:

containing acid or having the properties of an acid; having a pH of less than 7.

A sample of silicon has an average atomic mass of 28.084amu. In the sample, there are three isotopic forms of silicon. About 92.22% of silicon atoms are 27.9769amu, which have the mass of 28Si; about 4.68% are 28.9764amu, which have the mass of 29Si, and the isotope 30Si, makes up the remaining 3.10%. Calculate the atomic mass of 30Si. Report your answer with three significant figures The percentage abundance for  isotope is 3.09 %.

Isotopes are two or more atom types that share the same atomic number (number of protons in their nuclei), location in the periodic table, and chemical element but have distinct nucleon numbers (mass numbers) as a result of having a different number of neutrons in their nuclei. Although the chemical properties of each isotope of a given element are nearly identical, they differ in their atomic weights and physical characteristics.

The word "isotope" is derived from the Greek words "isos" and "topos," both of which imply "the same location." As a result, the name refers to the fact that various isotopes of a given element occupy the same spot on the periodic table. Scottish physician and author Margaret Todd first used it in a recommendation in 1913.

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Answer:

The correct options are;

1. 1,600

2. 100 Watts

A 23-30 watt CFL provides 1,600 lumens and is equivalent to a 100 Watts incandescent bulb

Explanation:

Brightness is measured in lumens and watts measure energy usage therefore with the use of an energy saving light bulb, the same lumination can be obtained at a lower energy usage.

According to a comparison chart for LED Lights vs. Incandescent Light Bulbs vs. Compact Fluorescents (CFLs) from USAI lightening website 23-30 watts CFL has a light output of 1,600 and is therefore produces enough light as a 100 Watts Incandescent Light Bulb

Also according to energy.gov website, CFLs save up to 75% energy such that a 23-30 watt CFL can produce the same illumination as a 100 watt incandescent bulb

Therefore we have, a 23-30 watt CFL provides 1,600 lumens and is equivalent to a 100 Watts incandescent bulb.

Answer:

1600 lumens, 100 watt incandescent

Explanation:

100% on edge (:

Representing -4  the overall negative charge in the formula \(TiO_2\), which contains 2 oxide ions. option A

The formula \(TiO_2\)represents a compound that consists of two oxide ions. Since each oxide ion carries a -2 charge, the total charge contributed by the oxide ions in \(TiO_2\)can be calculated by multiplying the charge of a single oxide ion (-2) by the number of oxide ions (2):

-2 × 2 = -4

Therefore, the overall negative charge in the formula \(TiO_2\), which contains 2 oxide ions, is -4. This means that the compound as a whole has a net charge of -4.

Looking at the options provided:

A. -4: This option correctly represents the overall negative charge calculated for the formula \(TiO_2\)and is the correct answer.

B. -2: This option represents the charge of a single oxide ion (-2), but since there are two oxide ions in the formula, the overall negative charge is -4, not -2.

C. +2: This option represents a positive charge, which is incorrect since we are dealing with an oxide ion that carries a negative charge.

D. +4: This option represents a positive charge, which is incorrect for the same reason as option C

option A i9s correct.

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The reaction between menthyl chloride and a strong base results in a single elimination product, 2-methylpropene, and a chloride ion.

Reaction is the process of responding to an event, action, or stimulus. It can be physical, emotional, mental, or a combination of all three.

Menthyl Chloride + Strong Base -->
Product 1: 2-Methylpropene + Chloride Ion
The reaction between menthyl chloride and a strong base results in a single elimination product, 2-methylpropene, and a chloride ion. This occurs because menthyl chloride has an allylic hydrogen, which can be abstracted by the strong base. This results in the formation of a carbocation intermediate, which then undergoes an E2 elimination reaction to form the desired product, 2-methylpropene.

Neomenthyl Chloride + Strong Base -->
Product 1: 2-Methylpropene + Chloride Ion
Product 2: 3-Methylpropene + Chloride Ion
The reaction between neomenthyl chloride and a strong base results in two elimination products, 2-methylpropene and 3-methylpropene, and a chloride ion. This occurs because neomenthyl chloride has two allylic hydrogens, which can be abstracted by the strong base. This results in the formation of two carbocation intermediates, which then undergo E2 elimination reactions to form the desired products, 2-methylpropene and 3-methylpropene.

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ΔSuniv = -0.14 kJ/K.

ΔG > 0, so the reaction will not be spontaneous.

To determine ΔSuniv, given ΔH∘rxn, ΔS∘rxn, and T, you can use the equation for Gibbs free energy change (ΔG):

ΔG = ΔH∘rxn - TΔS∘rxn

First, convert ΔS∘rxn to kJ/K:
ΔS∘rxn = 144 J/K * (1 kJ/1000 J) = 0.144 kJ/K

Now, calculate ΔG:
ΔG = 84 kJ - (300 K * 0.144 kJ/K) = 84 kJ - 43.2 kJ = 40.8 kJ

Next, find ΔSuniv using the formula:
ΔSuniv = -ΔG/T

ΔSuniv = -40.8 kJ / 300 K = -0.136 kJ/K

Since the answer requires two significant figures, ΔSuniv = -0.14 kJ/K.

A reaction is considered spontaneous if ΔG < 0. In this case, ΔG > 0, so the reaction will not be spontaneous.

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Answer:

D

Explanation:

I took a study island on this

Answer:

Explanation: Every electron has a single negative(-) charge, the addition of two electrons results in an oxygen ion with a charge of negative(−)2. This is  in fact true of every element located under oxygen in the periodic table.

P.S. hope this helps :)

for some reason it won't let me type the answer, it's the first option

Here's a table that classifies the objects based on their physical properties:

Object            Property

Rubber bands   Elasticity

Wood chips    Hardness

Straight pins    Sharpness

Aluminum foil    Malleability

Glass beads   Smoothness

Physical properties are characteristics that describe the basic nature of an object, such as its shape, size, texture, and other observable features, without reference to its composition.

The physical properties listed in the table are just a few examples of the ways in which these objects can be described and classified based on their physical characteristics.

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The following formula can be used to determine how many moles of KC1 are present in 1250 mL of 0.75 M KC1: Molarity (M) is equal to the moles of solute per litre of solution.

In this instance, the volume of the solution is 1250 mL, and the molarity of KC1 is 0.75 M. The following formula can be used to determine how many moles of KC1 are present in 1250 mL of 0.75 M KC1: Molarity (M) times the number of litres in the solution equals 0.75 M times (1250 mL/1000 mL/L) or 0.9375 moles of KC1.

Consequently, 0.9375 moles of KC1 are present in 1250 mL of 0.75 M KC1. It is significant to remember that a solution's molarity is a measurement of the amount of a solute present in a given volume of the solution.

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The measure of how densely a material is packed together is called density. As the mass per unit volume, it has that definition. The density of aluminum in g/cm³ is 2.70 g/cm³.

A substance's density is a measurement of how heavy it is in relation to its size. If an object is placed in water, it will float if it is less dense than the water, and it will sink if it is more dense. The density of a material is a distinguishing quality that is independent of the substance's volume.

The volume of the metal =315 cm³

Then density is:

Density = mass /volume

Density of metal = 851 g / 315cm³

D = 2.70 g / cm³

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We can form more HI by increasing the temperature.

An endothermic reaction is a chemical reaction that absorbs energy from its surroundings, typically in the form of heat. This means that the energy of the reactants is lower than the energy of the products, and the reaction requires an input of energy to proceed.

In an endothermic reaction, the temperature of the surroundings usually decreases because energy is being taken in from the environment. For example, when ice melts, the process is endothermic because the ice absorbs heat from its surroundings, causing the temperature to drop.

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Answer:Remove HI gas

Explanation:Acellus confirmed

Answer:

I'm pretty sure its stimulus

A given short peptide, SGYAL contains four peptide bonds. Any given short peptides/protein contain at least one amino group(s) (nh3 ) and one carboxyl group(s) (-coo- ).

SGYAL stands for secretaria general y asuntos legales. Sgyal is also written as Ser-Gly-Tyr-Ala-Leu . The structure of SGYAL is shown in the image attached. SGYAL contains four peptide bonds as highlighted by yellow color in the structure of SGYAL.

Peptide bond is formed by the condensation of carboxylic group of one molecule and amino group of other molecule. Any given short peptides/protein contain at least one amino group(s) (\(NH_{3}\)) and one carboxyl group(s) ( -COO-).

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Answer:

I guess the answer ia point A

After benzocaine is mixed with hydrochloric acid, it will be 4-aminobenzoic acid and soluble in the water.

Benzocaine, sold beneath the counter emblem called Orajel amongst over-the-counters, is an ester nearby ones over the counter normally used as a topical ache reliever or in cough drops. it's a far over-the-counter lively factor in many ones over counter ointments consisting of merchandise for oral ulcers.

Benzocaine is used to relieve aches and itching resulting from conditions that include sunburn or different minor burns, insect bites or stings, poison ivy, poison oak, poison sumac, minor cuts, or scratches.

Benzocaine is a local over-the-counter used in pain manage management, and it's far over-the-counter ester neighborhood ones over-the-counter elegance of medication. This pastime describes over-the-counter symptoms, actions, and contraindications for benzocaine as a valuable agent in coping with ache control.

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Answer:

17.5

Explanation:

20

Explanation:

Protons (the atomic number) and neutrons both contribute to the atomic mass.

If you therefore subtract the number of protons (19) from the atomic mass (39), you are left with the number of neutrons (=20).

hope this helped :)

When NaOH is added to water, it dissociates into Na+ and OH- ions. The OH- ions react with the H+ ions present in water, leading to an increase in the OH- ion concentration and a decrease in the H+ ion concentration. This results in a basic solution with a higher pH value. Therefore, the [H+] concentration decreases as more NaOH is added to water.

NaOH is a strong base, and when it is added to water, it dissociates completely into Na+ and OH- ions. These ions can react with the water molecules present in the solution to form hydroxide ions and hydronium ions. The reaction can be represented as follows: NaOH + H2O → Na+ + OH- + H2O The OH- ions produced in the reaction react with the H+ ions present in water, leading to the formation of water molecules. The reaction is given below: OH- + H+ → H2O As a result of this reaction, the concentration of H+ ions decreases in the solution. This decrease in the [H+] concentration causes the pH value of the solution to increase, making it more basic.

The pH value of a solution is a measure of its acidity or basicity, and it is defined as the negative logarithm of the hydrogen ion concentration [H+]. A solution with a pH value of less than 7 is considered acidic, while a solution with a pH value greater than 7 is basic. The pH scale is logarithmic, which means that a change in one pH unit represents a tenfold change in the [H+] concentration. When NaOH is added to water, the [H+] concentration decreases while the [OH-] concentration increases. The concentration of [H+] and [OH-] ions in a solution are related by the equation Kw = [H+][OH-], where Kw is the ion product constant of water (1 x 10^-14 at 25°C). Therefore, as [OH-] concentration increases, [H+] concentration decreases to maintain the equilibrium constant Kw. This relationship between [H+] and [OH-] ions in a solution is the basis of the pH scale and the acidity and basicity of solutions.
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A first-order reaction refers to a reaction in which the rate of the reaction is directly proportional to the concentration of a single reactant raised to the first power and is expressed as it would take approximately 46.4 minutes for the 80% completion of this first-order reaction to occur. 46.4 minutes.

Rate = k[A]

In this equation, k is the reaction rate constant, and [A] represents the concentration of reactant A.

The half-life of a reaction of the first order completes in 10 minutes. We need to find out how much time will be needed for the 80% completion of this reaction.

To solve for the time needed for 80% completion of a reaction of the first order, we need to use the formula:

Time for 80% completion = 2.303/k x log ([A]₀/[A]t)

where k is the reaction rate constant, [A]₀ is the initial concentration of the reactant and [A]t is the concentration of the reactant after the given time t, and 2.303 is a conversion factor.

Let [A]₀ = 1 and [A]t = 0.2 (since 80% completion means 20% of the original concentration remains)

We know that, t1/2 = 10 min;

therefore, k = 0.693/t1/2

= 0.693/10

= 0.0693 (as 0.693 = ln2)Now,

Time for 80% completion

= 2.303/k x log ([A]₀/[A]t)

= 2.303/0.0693 x log(1/0.2)

= 46.4 minutes

Therefore, it would take approximately 46.4 minutes for the 80% completion of this first-order reaction to occur. 46.4 minutes.

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If we decrease the temperature to 200 K at constant pressure, 13.3 L  would the new volume .

What is temperature?

Temperature is a unit used to represent how hot or cold something is. It can be stated using the Celsius or Fahrenheit scales, among others. Temperature shows which way heat energy will naturally flow, i.e., from a hotter (body with a higher temperature) to a colder (body with a lower temperature) (one at a lower temperature).

What is pressure?

As force applied per unit area, pressure is defined. P=FA, where F is the force operating perpendicular to the surface area A, gives it mathematical expression. The pascal (Pa), which equates to a newton per square metre (N/m 2), is the accepted unit of pressure.

Therefore, If we decrease the temperature to 200 K at constant pressure, 13.3 L  would the new volume .

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Answer:

One of the great things about science is that we are constantly learning new things about the world around us. There's actually something called fact decay where over time more and more of what was considered a fact is disproven or modified. It's also amazing how quickly science is turned into technology

Explanation:

The Answer is:

-111.0

As a result, it is important to store NaOH in a dry and cool place, away from any sources of moisture or water.

NaOH, also known as sodium hydroxide, is a highly hygroscopic solid. This means that it can easily absorb moisture from its surroundings, including the air. When NaOH absorbs water, it can become more corrosive and potentially dangerous.

This is why it is also important to handle NaOH with care and wear appropriate protective gear, such as gloves and goggles. Additionally, any spills or leaks should be cleaned up immediately and properly disposed of according to local regulations.

By following these precautions, NaOH can be safely used in a variety of applications, including in the production of soap, paper, and textiles.

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