Identify each of the changes listed below as chemical or physical.

Evaporation of Water ________________

Digesting Food ______________________

Rotting Wood ______________________

Rusting Car ______________________

Drying Clothes ______________________

Souring Milk ______________________

Baking a Cake ______________________

Answer:

The answer would be (b)

Explanation:

The Mass percent of sugar in the sample was 66% while the Total percent recovery is 95.7%

An equation is an expression used to show the relationship between two or more variables and numbers.

Given the sample had a mass of 53.5g, hence:

Mass percent of sugar in the sample = (35.2/53.5) * 100% = 66%

Total percent recovery = [(35.2 + 16)/ 53.5] * 100% = 95.7%

The Mass percent of sugar in the sample was 66% while the Total percent recovery is 95.7%

Find out more on Equation at: https://brainly.com/question/13763238

Measles is a communicable disease that requires immunization to prevent illness when exposed to it.

Measles is a communicable disease and highly contagious. It  is usually very serious in children. The disease can be contacted through droplets in the air, physical contact and through mother-to-child transmission.

It is a very serious disease as it is caused by a virus which replicates very fast in the throat and nose thereby creating symptoms such as runny nose, coughing, sneezing and is usually accompanied with a rash.

The severity and death rates is what gave rise to the creating of a measles vaccine which is usually given to babies after birth to make them immune to the potential exposure to the virus.

Diabetes, bronchitis and strep throat have no vaccine as they can always be treated or managed with over-the-counter drugs.

Read more on https://brainly.com/question/25249487

Answer:

Explanation:

The balanced equation says that we'll get 1 mole of H2 for every 1 mole of Mg.  50 grams of H is 50g/2 g/mole = 25 moles of H2.  That means we'll need 25 moles of Mg.  Convert that into grams:  (25 moles Mg)*(24.3 g/mole) = 607 grams Mg.  

At STP, all gases occupy 22.4 liters/miole.  That means 25 moles of H2 would occupy (25 moles)*(22.4 liters/mole) = 560 liters.

Large organic molecules are usually assembled by polymerization of a few kinds of simple subunits belonging to the same class of chemicals.  The following is an exception to this statement is:

c) Steroids

Large organic molecules, such as proteins, nucleic acids, and carbohydrates, are typically formed through the process of polymerization. Polymerization involves the repetitive bonding of smaller subunits, known as monomers, to form a long chain or polymer. These monomers usually belong to the same class of chemicals, meaning they have similar structures and functional groups.

In the case of DNA, the monomers are nucleotides, which consist of a sugar molecule, a phosphate group, and a nitrogenous base. The repetitive bonding of nucleotides creates a long chain of DNA.

Similarly, cellulose, a major component of plant cell walls, is composed of repeating units of glucose monomers. The polymerization of glucose molecules forms long cellulose chains.

Contractile proteins, such as actin and myosin found in muscle fibers, are also assembled through the polymerization of monomers. These monomers, called amino acids, are linked together by peptide bonds to form polypeptide chains, which then fold into the functional protein structure.

However, steroids, including molecules like cholesterol, estrogen, and testosterone, are an exception to this general pattern of polymerization. Steroids have a distinct structure consisting of four fused carbon rings. They are not formed through repetitive bonding of identical subunits like proteins or nucleic acids. Instead, steroids are synthesized through specific biosynthetic pathways in living organisms.

While steroids play crucial roles in various physiological processes, they do not follow the typical pattern of polymerization seen in other organic polymers.

To know more about polymerization here

https://brainly.com/question/27354910

#SPJ4

The complete question is:

Large organic molecules are usually assembled by polymerization of a few kinds of simple subunits belonging to the same class of chemicals. which of the following is an exception to this statement?

a) DNA

b) cellulose

c) steroids

d) a contractile protein

Answer:

c because it is a group of elements

Explaation:

Answer:

B. It's a physical change because the water and the salt kept their original properties.

Explanation:

Even though it tastes like salty water, the salt is still present, just in smaller molecules. It can be brought back so it is a physical change.

Taking into account the Charles' law, the temperature of the gas if the volume drops to 75.0 L is 246 K or -27 C.

Charles' law establishes the relationship between the temperature and the volume of a gas when the pressure is constant. This law says that for a given sum of gas at constant pressure, as the temperature increases, the volume of the gas increases and as the temperature decreases, the volume of the gas decreases. That is, the volume is directly proportional to the temperature of the gas.

Mathematically, Charles' law is a law that says that when the amount of gas and pressure remain constant, the ratio between volume and temperature will always have the same value:

\(\frac{V}{T}=k\)

Considering an initial state 1 and a final state 2, it is fulfilled:

\(\frac{V1}{T1}=\frac{V2}{T2}\)

In this case, you know:

Replacing in Charles's law:

\(\frac{100 L}{328 K}=\frac{75 L}{T2}\)

Solving:

\(T2x\frac{100 L}{328 K}=75 L\)

\(T2=\frac{75 L}{\frac{100 L}{328 K}}\)

T2= 246 K= -27 C

Finally, the temperature of the gas if the volume drops to 75.0 L is 246 K or -27 C.

Learn more about Charles' law:

https://brainly.com/question/4147359

#SPJ1

Answer:

Scandium

Explanation:

The statement that adding one -OH group to four carbons makes alcohol miscible in water is false.

The miscibility of alcohols in water depends on various factors, including the size of the alkyl group and the presence of other functional groups.

Alcohols are generally miscible in water due to the presence of the hydroxyl (-OH) group, which allows them to form hydrogen bonds with water molecules. However, the miscibility of alcohols in water is not solely determined by the number of carbon atoms in the molecule.

The solubility of alcohols in water decreases as the size of the alkyl group attached to the hydroxyl group increases. Smaller alcohols, such as methanol (CH₃OH) and ethanol (C₂H₅OH), are completely miscible in water. As the alkyl group becomes larger, such as in higher molecular weight alcohols like butanol (C₄H₉OH), their solubility in water decreases.

Learn more about the hydroxyl group here:

https://brainly.com/question/30650792

#SPJ4

Answer:

The balanced reaction for the decomposition of baking soda is

2 NaHCO3(s) → Na2CO3(s) + CO2(g) + H2O(g)

We can find the heat of reaction by using the Hess' Law. This is done by using this formula:

∑(Hf,products) -∑(Hf,reactants) = Heat of reaction

where Hf is the heat of formation. According to literature, these are the heats of formation for each of the compounds in the reaction:

NaHCO3: -947.68 kJ/mol

Na2CO3: -1130.94 kJ/mol

CO2: -393.51 kJ/mol

H2O: -241.8 kJ/mol

Applying Hess' Law:

[1(-1130.94) + 1(-241.82)] + 1(-393.51)] - [2(-947.68)] = 129.09 kJ

Thus, the heat of reaction is 129.09 kJ/mol NaHCO3. Since there is 1.96 mol of NaHCO3, the total heat of reaction is 253.02 kJ

Explanation:

please mark me as brainlest

Answer:

b) posee la forma del recipiente que lo contiene y ocupa un volumen constante

Explanation:

Hay tres estados de la materia;

Sólido

Líquido

Gas

En estado líquido, la materia no tiene forma ni volumen definidos. Esto implica que la materia adquiere la forma del recipiente en el que se encuentra.

El líquido tiene un volumen definido. No ocupa el volumen del envase.

More about this source textSource text required for additional translation information

Answer:

5.46x\(10^{8}\)

Explanation:

just move the decimal however many places to the left until there is only one digit to the left of it and then square the ten by that number

Answer:

An equation is written in a correct way if the equation is balanced. If you want to find out if the equation is balanced, you have to count how many molecules of each element is present and then just balance the equation on the left side and the right side.

A greater speed of particles in a container will lead to an increase in temperature, pressure, potential phase changes, and possibly container expansion if the container is not rigid.

If there is a greater speed of particles in a container, the following changes will occur:

1. Increase in temperature: Faster-moving particles will have greater kinetic energy, which will result in an increase in the temperature of the system.

2. Increase in pressure: As the particles move faster, they will collide more frequently with the walls of the container, exerting a greater force. This leads to an increase in pressure.

3. Potential phase change: If the increase in temperature is significant enough, a phase change may occur, such as a solid melting into a liquid or a liquid evaporating into a gas.

4. Expansion of the container (if not rigid): If the container is not rigid, the increased pressure may cause it to expand or deform.

To summarize, a greater speed of particles in a container will lead to an increase in temperature, pressure, potential phase changes, and possibly container expansion if the container is not rigid.

To know more about speed of particles refer here: https://brainly.com/question/31184765#

#SPJ11

4.6 mol of even more Br2 required 9.2 molecules of lithium being completely oxidized.

Liquid electrolytes, which include several lithium compounds, are frequently prescribed for psychological problems, including bipolar disorder including major depressive episode. Lithium is taken orally. Common side effects include increased urination, shaking in the hands, and especially increased appetite. Lithium is often extracted from igneous materials that contain lithium minerals.

Bipolar depressed mood episodes may be treated with lithium, which also helps to lower the frequency and intensity of mania, the elevated, euphoric side of the temperament spectrum. Lithium also helps to stop reoccurring manic or depressive episodes.

To know more about lithium visit:

https://brainly.com/question/29793732

#SPJ1

Answer:

Are you a fruit, because honeydew you know how beautiful you look right now?

or maybe

I hear you’re good at algebra…..Will you replace my eX without asking Y?

or maybe

On a scale of one to ten you’re a nine… Because I’m the one left that you need.

Explanation:

Hope these help you.

Answer: The density of kerosene is \(2.7g/cm^3\)

Explanation:

Density is defined as the mass contained per unit volume.

\(Density=\frac{mass}{Volume}\)

Given : Mass of kerosene = mass of beaker with kerosene - mass of empty beaker = 60 g - 20 g = 40 g

Volume of kersone = \(15cm^3\)

Putting in the values we get:

\(Density=\frac{40g}{15cm^3}\)

\(Density=2.7g/cm^3\)  

Thus the density of kerosene is \(2.7g/cm^3\)

Answer:

did you get the answer???

Explanation:

I really need help

With just an averaged concentration of fifty ppm, Zn concentrations of soils range between 10 to 300 ppm on the geochemical composition. Zinc content would've been 100 * 0.289523, and 28.9523 ppm higher.

The major causes of elevated zinc levels are lead toxicity and iron insufficiency. Infections, anaemia, and chronic disease sufferers may also have high zinc levels, although these disorders are not often tracked or diagnosed with zinc assays. Interpret your laboratory findings.

Zinc levels in air, soil, or water have increased as a result of increased demand for zinc around the world over the past few decades, incorrect wastewater discharge from mineral extraction and processing, landfill or dumpsite spills, and the combustion of fossil fuels.

To know more about geochemical visit:

https://brainly.com/question/29896927

#SPJ1

Answer:

Water Desalination Processes. Water desalination processes separate dissolved salts and other minerals from water. Feedwater sources may include brackish, seawater, wells, surface (rivers and streams), wastewater, and industrial feed and process waters. Membrane separation requires driving forces including pressure (applied and vapor)

Explanation:

Salinized water cannot be consumed by humans, but it can be converted into freshwater, which has a variety of purposes. Desalination is the procedure, and it is being employed increasingly frequently all over the world to supply people with the freshwater they require.

Desalination is the procedure used to remove the dissolved mineral salts from water. Currently, one of the most popular methods for obtaining fresh water for use in agriculture or human consumption when applied to seawater.

When seawater evaporation occurs, salt is left behind, and clouds are formed, which eventually result in rain. Da Vinci realised that it was easy to obtain using a still. Aristotle had observed that seawater would evaporate and condense into fresh water.

Seawater desalination was mostly utilised on ships and submarines over the next centuries to supply the crew with fresh water during lengthy voyages. Nevertheless, this method was not widely accessible until the industrial revolution and, more specifically, until the creation of desalination facilities.

To know more about desalination, visit;

https://brainly.com/question/31182435

#SPJ3

The hydrogen ion concentration in a solution with \(1.6*10^-^1^1\)hydroxide ions can be calculated using the relationship between hydroxide and hydrogen ion concentrations, as described by the pH scale.

The pH scale is used to measure the acidity or alkalinity of a solution. It is based on the concentration of hydrogen ions (\(H^+\)) in a solution. The concentration of hydrogen ions is inversely proportional to the concentration of hydroxide ions (\(OH^-\)) in water. The product of the hydrogen ion concentration and the hydroxide ion concentration in pure water is constant and equal to \(1.0 * 10^-^1^4\) at 25 degrees Celsius.

To determine the hydrogen ion concentration in a solution with \(1.6*10^-^1^1\) hydroxide ions, we can use the relationship mentioned above. By dividing the constant value of \(1.0 * 10^-^1^4\) by the given hydroxide ion concentration, we obtain the hydrogen ion concentration. Therefore, the hydrogen ion concentration would be approximately \(6.25 * 10^-^4\).

It's important to note that this calculation assumes the solution is at 25 degrees Celsius and does not take into account any other ions or molecules present in the solution that could affect the pH.

Learn more about  hydrogen ion here:

https://brainly.com/question/8069088

#SPJ11

Cross-functional teams and employee involvement teams are groups of workers who meet on a regular basis with the goal of applying their expertise to continuous improvement.

Cross-functional teams are composed of members from different departments within an organization, while employee involvement teams are typically composed of workers from the same department.

Virtual teams and informal groups may also work together to improve processes, but they are not specifically designed for the purpose of continuous improvement.

Learn more about Cross-functional teams at: https://brainly.com/question/1490525

#SPJ4

The iupac name for the compound shown having the longest carbon chain is five carbons. There are two CH3 groups attached to the second carbon in the chain and there is a third CH3 group attached to the third carbon in the chain is 2,2,3—trimethylpentane.

The IUPAC nomenclature of organic chemistry is defined as a type of method of naming organic chemical compounds which recommended by the International Union of Pure and Applied Chemistry.

Since, there is longest chain of five carbon with single bond. Its suffix named as Pentane.

There are two methyl group attached to second carbon and one is to third carbon. So, there are total three methyl group. Therefore, the prefix given as trimethyl.

Thus, we concluded that the iupac name for the compound shown having the longest carbon chain is five carbons. There are two CH3 groups attached to the second carbon in the chain and there is a third CH3 group attached to the third carbon in the chain is 2,2,3—trimethylpentane.

learn more about IUPAC Name:

https://brainly.com/question/27843604

#SPJ4

Answer: It's 2,089m2

Explanation:

Answer:

The links are: the number of circles in the electronic configuration of an element is represented in the periodic table as the period number that element is situated in. the number of electrons in the outermost shell of an element is represented in the periodic table as the group number that element is situated in.

Explanation: