All living things are made of two or more cells. true or false quick pls :)

Approximately 311 mL of water at 84.9 °C should be mixed with 222 mL of water at 27.7 °C to achieve a final temperature of 42.9 °C.

To solve this problem, we can use the concept of heat transfer: heat gained by the colder water will equal heat lost by the hotter water. We can write this as:
m₁*c*(\(T_{f}\) - T₁) = \(m_{2}\) *c*(\(T_{2}\)  - \(T_{f}\) )

Here, \(m_{1}\)  and \(m_{2}\)  are the masses of the two water samples, c is the specific heat capacity of water, \(T_{1}\)  and \(T_{2}\)  are the initial temperatures of the water samples, and \(T_{f}\)  is the final temperature.

Given that the density of water remains constant, we can assume that 1 mL of water weighs 1 gram. Therefore, m₁ = V₁ (volume of the first water sample) and m₂ = 222 grams (volume of the second water sample). The specific heat capacity of water, c, is 4.18 J/(g·°C).

We have
V₁*4.18*(42.9 - 27.7) = 222*4.18*(84.9 - 42.9)

Solving for V1:
V₁ = (222*(84.9 - 42.9))/(42.9 - 27.7)
V₁ ≈ 311.169

Therefore, approximately 311 mL of water at 84.9 °C should be mixed with 222 mL of water at 27.7 °C to achieve a final temperature of 42.9 °C.

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Answer: it is classified as a star

Explanation:

The sun is big source of energy but it is still a star

Answer:

the sun is the solar systems biggest star. a moderately large yellow dwarf

Answer:

Look at the screenshot below.

Those are your answers!

Good Luck.

Explanation:

The number of valence electrons for neutral atoms is the same as the number of the atom's main group.A periodic table element's column can be used to determine its main group number.For instance, carbon, which belongs to group 4, has four valence electrons.

Use the periodic table to identify the number of valence electrons available for bonding for each of the following elements?

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Answer:Hydroxide   OH –

Acetate   CH 3 COO –

Cyanide   CN

Explanation:

Acetate (CH3COO-), phosphate (PO43-), permanganate (MnO4-), oxalate (C2O42-), and other polyatomic ions are examples.

What is polyatomic ion?

Ions with more than one atom in them are called polyatomic ions. For instance, the nitrate ion, NO3-, has one nitrogen and three oxygen atoms in it. Typically covalently bound to one another, the atoms in a polyatomic ion remain together as a single, charged particle. Atoms or groups of atoms with an electric charge are referred to as ions. Cations are positive-charged ion particles. Anions are ion types that have a net negative charge. The body contains ions of several common chemicals.

Examples that are frequently used are sodium, potassium, calcium, chloride, and bicarbonate. Bicarbonate, acetate, and C2H3O2 (or hydrogen carbonate) HCO3- Bisulfate (or hydrogen sulfate) -HSO4-Hypocholite -ClO-Chlorate -ClO3-Cyanide -ClO2-Cyanide -CN-Hydroxide -OH-

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The statement "Reaction of heating potassium permanganate produces potassium manganate" is false.

The reaction of heating potassium permanganate (KMnO₄) does not produce potassium manganate (K₂MnO₄). Instead, it undergoes a thermal decomposition reaction, resulting in the formation of different products.

When heated, potassium permanganate decomposes into potassium manganate (K₂MnO₄), manganese dioxide (MnO₂), and oxygen gas (O₂).

The reaction can be represented as follows:

2 KMnO₄(s) → K₂MnO₄(s) + MnO₂(s) + O₂(g)

Therefore, heating potassium permanganate leads to the formation of potassium manganate, along with manganese dioxide and oxygen gas. The color change from purple to green observed during the reaction is due to the formation of potassium manganate.

However, it is important to note that potassium manganate is not the sole product of the reaction but one of the products alongside manganese dioxide and oxygen gas.

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Complete question :

Reaction of heating potassium permanganate produces potassium manganate. T/F

Answer:

9) 126.86 amu

10) 197.26 amu

11) 55.83531 amu

or 55.8 amu (to 3 s.f.)

13) 14.07 amu

Explanation:

Please see attached picture for full solution.

Answer:

co2

Explanation:

it is an ionic compound

Answer:

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

\(n = \frac{N}{L} \\ \)

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

\(n = \frac{8.03 \times {10}^{23} }{6.02 \times {10}^{23} } \\ = 1.33388704...\)

We have the final answer as

Hope this helps you

Answer:

i think it is a the full moon

Answer:

a. 3.00 mol Al = 3.00 x 27.0 g/mol = 81.0 g

b. 2.56 × 10^24 atoms Li = 2.56 × 10^24 x 6.939 g/mol = 17.75 g

c. 1.38 mol N = 1.38 x 28.0 g/mol = 38.64 g

d. 4.86 × 10^24 atoms Au = 4.86 × 10^24 x 197.0 g/mol = 961.3 g

e. 6.50 mol Cu = 6.50 x 63.5 g/mol = 410.75 g

f. 2.57 × 10^8 mol S = 2.57 × 10^8 x 32.1 g/mol = 82,567,600 g

g. 1.05 × 10^18 atoms Hg = 1.05 × 10^18 x 200.6 g/mol = 210,000 g

Answer:

A chemical change is required to separate the elements present in it.

Explanation:

The only true statement from the choices given is that water as a pure substance requires a chemical change to separate the elements present in it.

Water is a molecule consist of two atoms of hydrogen and one atom of oxygen.

Therefore, we see that only the first choice satisfies this problem.

The natural movement of molecules along their chemical gradient.

A molecule is the smallest unit of a chemical compound and is made up of two or more atoms connected by chemical bonds. It has the chemical properties of the compound. The atoms that make up molecules might be of the same kind, as in the case of molecular oxygen (O2), or they can be of different types, as in the case of water (H2O), which is composed of hydrogen and oxygen atoms.

The tendency of molecules is to spontaneously shift from a region of higher concentration to a region of lower concentration along their chemical gradient. Due to the random mobility of individual molecules and their propensity to spread themselves uniformly in space, a concept known as diffusion governs this movement. Natural processes such as diffusion take place in both living and non-living systems, and they are essential to many biological activities like respiration, osmosis, and the transportation of nutrients and wastes.

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Answer:

Advantakes= it is a renewable source, you can but it anywhere with sunlight

disatvantage= it cost a lot to place/replace, it uses a lot of different materials

Answer:

Temperature is a measure of the average kinetic energy of the particles in a substance.

Answer:

9.8g

Explanation:

Using periodic table find molar mass of C and H:

C=12.01g/mol

H=1.008g/mol

Molar mass of C2H4=(12.01)2+(1.008)4=28.03g/mol

Using molar mass times moles of the chemical to find the mass in 0.35 moles of c2h4:

28.03 x 0.35=9.8grams

Answer:

It is a living plant

Explanation:

Answer:

D

Explanation:

To coordinate all other human body system so that they can function together to maintain homeostasis

Answer:

Ye? everything is made up of atoms so sure

The amount of salt in the tank as a function of time is f(t) = 70 + 4t, where f(t) is the amount of salt in the tank after t minutes.

The rate of salt entering the tank is 2 lb/gal x 2 gal/min = <<2*2=4>>4 lb/min, where the concentration of salt is 2 lb/gal. Initially, the tank contains 70 lb of salt and 280 gal of water. When the brine flows into the tank at a constant rate of 2 gal/min, the concentration of salt in the tank remains constant. When the tank is stirred, the salt will be uniformly distributed throughout the mixture. Let’s assume that t is the time in minutes. As a result, the number of minutes that the solution is in the tank will be t. Since the concentration of salt in the tank remains constant, the amount of salt in the tank after t minutes is 70 lb + 4 lb/min × t.

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Enolates are commonly formed from the deprotonation of ketones or aldehydes, which results in the formation of a carbonyl group with a negative charge.

The difference between an enol and an enolate is that an enol is a compound that has both an alcohol (-OH) and an alkene (=C-H) group, while an enolate is the anionic form of an enol after deprotonation of the alpha-carbon adjacent to the carbonyl group. Enolates are formed by removing a proton from the alpha-carbon of the enol, which gives the molecule a negative charge alcohols, on the other hand, are a class of organic compounds that contain an -OH functional group. Alcohols can be classified based on the number of alkyl groups attached to the carbon atom that is bonded to the -OH group. Primary, secondary, and tertiary alcohols are examples of this classification. Alcohols can also be converted into enols by deprotonation of the -OH group.

In summary, enols and enolates are related but different compounds. Enols are alcohols that contain an alkene group, while enolates are the anionic form of enols after deprotonation of the alpha-carbon adjacent to the carbonyl group. Alcohols, on the other hand, are a class of organic compounds that contain an -OH functional group.

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True, if you followed a single carbon atom in a glucose molecule that goes through cellular respiration, you could eventually find that carbon atom in a molecule of carbon dioxide.

This is where the citric acid metabolic pathways of cellular respiration occur. After the glycolysis process happens in cell cytoplasm to form pyruvate from glucose molecules, the pyruvate is converted to acetyl-CoA that enters the mitochondria for the TCA cycle. The TCA produces more ATPs from the energy molecule. The carbon atoms will ultimately be expelled from the cell as carbon dioxide.

Reaction involved: (glucose) C₆H₁₂O₆ (s) + 6 O₂ (g) → 6 CO₂ (g) + 6 H₂O (l) + heat energy

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Answer:

Groups and periods are two ways of categorizing elements in the periodic table. Periods are horizontal rows (across) the periodic table, while groups are vertical columns (down) the table. Atomic number increases as you move down a group or across a period

Explanation:

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In order to deprotonate an acid, we must remove protons in order to achieve a more stable conjugate base. For this example, we can use the relationship between carboxylic acid and hydroxide.

Deprotonation is the removal of a proton from a specific type of acid in reaction to its coming into contact with a strong base. The compound formed from this reaction is known as the conjugate base of that acid. The opposite process is also possible and is when a proton is added to a special kind of base. This is a process referred to as protonation, which forms the conjugate acid of that base.

For the example we have chosen to give, the conjugate base is the carboxylate salt. This would be the compound formed by the deprotonated carboxylic acid. The base in question was strong enough to deprotonate the acid due to the greater stability offered as a conjugated base.

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Explanation:

Electrolysis is a redox (reduction-oxidation) reaction that transfers electrons from the positive electrode called the anode to the negative electrode called the cathode with the help of a voltage source such as a battery. The anode shrinks as it gets oxidized by losing electrons, (oxidation) and the cathode grows as it gets reduced with electrons (reduction). In electroplating, the cathode is an object that needs to be plated with metal. Electrons flow to the object and reduce the surface of the object to produce a thin plating of metal. This is electroplating, and it is done to protect objects from corrosion such as spoons.

Answer:

1 C₈H₂₀ + 13 O₂ → 8 CO₂ + 10 H₂O

Explanation:

When balancing chemical equations, looking for the compound that looks the hardest and put a 1 in front of it.

In this case, it would be C₈H₂₀. Put a 1 in front of it.

Now, let's look at the reactants.

C - 8

H - 20

O - 2

Let's look at the products.

C - 1

O - 3

H - 2

To balance the carbons, put 8 in front of CO₂. To balance the hydrogens, put 10 in front of H₂O.

Now to balance the oxygens. There are 16 oxygen atoms in CO₂ and 10 oxygen atoms in  H₂O for a total of 26 oxygen atoms in the products.

To balance the oxygens, put 13 in front of O₂ in the reactants.

The equation is balanced.

Hope that helps.

The dominant transport mechanism in the lake is diffusion. The water treatment plant has a limited time before it needs to start treating for manganese, and the minimum height above the lake bottom for the water intake to provide one year for designing and installing a manganese treatment system needs to be determined.

Dominant transport mechanism: Diffusion is the main transport mechanism in the lake. This means that manganese is gradually diffusing from the solid deposits at the lake bottom into the water column.

 t = (L^2) / (4D)

where t is the time in seconds, L is the distance from the bottom (1 ft or 30.48 cm), and D is the diffusion coefficient of manganese (6.88×10^(-6) cm^2/s).

Calculation Plugging in the values into the equation, we can calculate the time it takes for manganese to reach the water intake level.

  t = (30.48^2) / (4 × 6.88×10^(-6)) = 126,707 seconds

  Converting seconds to days: 126,707 seconds ÷ (24 hours/day × 3600 seconds/hour) ≈ 1.47 days

  Therefore, the water treatment plant has approximately 1.47 days before it needs to start treating for manganese.

Minimum intake height: To provide one year for designing and installing a manganese treatment system, the intake should be raised to a height where the time it takes for manganese to reach that level is one year.

  t = (L^2) / (4D)

  Rearranging the equation to solve for L:

  L = √(4Dt)

  Plugging in the values: L = √(4 × 6.88×10^(-6) cm^2/s × (1 year × 365 days/year × 24 hours/day × 3600 seconds/hour))

  L ≈ 49.65 cm or 0.163 ft

The minimum height above the lake bottom that the intake should be raised to is approximately 0.163 ft.

The dominant transport mechanism in the lake is diffusion, where manganese is slowly diffusing from the solid deposits into the water column. The water treatment plant has approximately 1.47 days before it needs to start treating for manganese to maintain concentrations below the detection limit. To provide one year for designing and installing a treatment system, the intake should be raised to a minimum height of approximately 0.163 ft above the lake bottom.

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Both sand and potting soil are mixtures because they both contains more than one type of substances. Both are composed of minerals and different substrates.

Mixtures are substance formed by the combination of two or more components. The mixtures can be homogenous or heterogenous. Homogenous mixtures contains only one phase.

Heterogenous mixtures are of components with different phases. Sand is an example of heterogenous mixture. The major component of sand is silicon dioxide. it also contains grains of other minerals.

Potting soil is a mix of soil and minerals used for plantation. It also known as potting compost since it contains wood products, vermiculates, clay etc. Therefore, potting soil is a mixture.

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Rutherford's model of atom could not explain chemical properties as it did not make any mention as to how chemical changes take place.

These properties are defined as those properties which become evident during or after a chemical reaction after the identity of the substance is changed during chemical reaction.

These properties cannot be determined externally just by viewing the substance ,these change immensely after a substance undergoes a chemical change.These are used for identification of unknown substances and for building up chemical classifications.

The major chemical properties are flammability,toxicity,reactivity,acidity and heat of combustion.For a chemical property to be apparent , it is necessary that the structure of the substance is altered.

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Answer:

A solution is made when a substance called the solute "dissolves" into another substance called the solvent.

Explanation:

Dissolving is when the solute breaks up from a larger crystal of molecules into much smaller groups or individual molecules.

Answer::

*Gravitational potential energy transforms into thermal energy.*

O Gravitational potential energy transforms into kinetic energy.

O Gravitational potential energy transforms into thermal energy.

In this case, both options A and B are correct.

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