How many structural isomers does C5H12 have?
a. two
b. three
c. one
d. five

The amount of energy needed to freeze 12.5 grams of water into ice is equals to 14.295 kilo joules.

Energy required to freeze water will be calculated by using the following equation as:

Q = mcT, where

m = mass of water = 12.5g = 0.0125kg

c = specific heat of water = 4.187 kJ/kg.K

T = temperature to freeze = 0 degree C = 273.15 K

On putting values we get,

Q = (0.0125)(4.187)(273.15)

Q = 14.295 kJ

Hence required amount of energy is 14.295 kJ.

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The volume of foil for 14.45cm times 8.55 cm times 0.550 g is

67.95 cm^3

Volume = lenght * breadth * height

          = 14.45cm * 8.55 cm * 0.550 cm

          = 67.95 cm^3

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The amount of energy that will be produced from 155 g o methane would be 7,770.26 kJ of energy.

The molar mass of methane (CH4) is 16.04 g/mol (1 carbon atom at 12.01 g/mol and 4 hydrogen atoms at 1.01 g/mol each).

To determine how much energy will be produced from 155 g of CH4, we first need to calculate the number of moles of CH4 in 155 g:

n = m/M

where n is the number of moles, m is the mass, and M is the molar mass.

Substituting the values, we get:

n = 155 g / 16.04 g/mol = 9.668 mol

Therefore, we have 9.668 moles of CH4.

The energy produced per mole of CH4 is given as 803 kJ/mol. So, the total energy produced from 9.668 moles of CH4 can be calculated as:

E = 803 kJ/mol x 9.668 mol = 7,770.26 kJ

Therefore, 155 g of CH4 will produce approximately 7,770.26 kJ of energy.

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Answer: The human body readily responds to changing environmental stresses in a variety of biological and cultural ways. We can acclimatize to a wide range of temperature and humidity. ... This ability to rapidly adapt to varying environmental conditions has made it possible for us to survive in most regions of the world.

Explanation:

while zinc is an important mineral with numerous functions in the body, it is not true that grains are the most reliable food source of zinc. A balanced diet that includes a variety of foods can provide adequate zinc intake for most people.

How to solve the problem?

The statement that is NOT true of zinc is "Grains are the most reliable food sources of zinc." While grains can be a source of zinc, they are not necessarily the most reliable source.

Zinc is an essential mineral that plays important roles in many biological processes, including immune function, protein synthesis, wound healing, and DNA synthesis. It is involved in various enzymatic reactions, and acts as a cofactor for many enzymes. Zinc is also important for proper growth and development, especially during childhood and adolescence.

Excess zinc intake can lead to decreased copper absorption, as both minerals compete for absorption in the intestines. This can lead to copper deficiency, which can cause anemia neutropenia, and other health problems. Therefore, it is important to maintain a balance between zinc and copper intake.

While grains can be a source of zinc, other foods such as meat, seafood, and dairy products are also good sources. Vegetarians and vegans may need to pay particular attention to their zinc intake, as plant-based sources of zinc may be less bioavailable than -based sources. Zinc supplements can also be used to prevent or treat deficiencies, but should be used with caution as excessive intake can have negative health effects.

In summary, while zinc is an important mineral with numerous functions in the body, it is not true that grains are the most reliable food source of zinc. A balanced diet that includes a variety of foods can provide adequate zinc intake for most people.

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Answer:

D . They are found in moist environments.

Explanation:

Nonvascular plants do not have a xylem or phloem, roots, stems, or leaves. Because these plants lack water-conducting tissues, they fail to achieve the structural complexity and size of most vascular plants and have evolved in habitats which allow their survival and reproduction.

The plant body that is most obvious in non-vascular plants are the the gametophyte generation. The gametophte gemeration is haploid.

The non-vascular plants grow in moist environments. It is due to lack of vascular tissue that requires to maintain close contact with water to prevent desiccation. Nonvascular plants are plants that do not have any special internal pipelines or channels to carry water and nutrients. Instead, nonvascular plants absorb water and minerals directly through their leaflike scales. Nonvascular plants are usually found growing close to the ground in damp, moist places. Non-vascular plants thrive in damp conditions since they don't need to rely on roots to acquire enough water.

Answer:

The balanced equation is given below: C2H6O + 3O2 —> 2CO2 + 3H2O

The coefficients are: 1, 3, 2, 3

Explanation:

C2H6O + O2 —> CO2 + H2O

The above equation can be balance as follow:

There are 2 atoms of C on the left side and 1 atom on the right side. It can be balance by putting 2 in front of CO2 as shown below:

C2H6O + O2 —> 2CO2 + H2O

There are 6 atoms of H on the left side and 2 atoms on the right side. It can be balance by putting 3 in front of H2O as shown below:

C2H6O + O2 —> 2CO2 + 3H2O

There are a total of 3 atoms of O on the left side and a total of 7 atoms on the right side. It can be balance by putting 3 in front of O2 as shown below:

C2H6O + 3O2 —> 2CO2 + 3H2O

Now the equation is balanced.

The coefficients are: 1, 3, 2, 3.

Answer:

The balanced equation is given below: C2H6O + 3O2 —> 2CO2 + 3H2O

The coefficients are: 1, 3, 2, 3

Explanation:

C2H6O + O2 —> CO2 + H2O

The above equation can be balance as follow:

There are 2 atoms of C on the left side and 1 atom on the right side. It can be balance by putting 2 in front of CO2 as shown below:

C2H6O + O2 —> 2CO2 + H2O

There are 6 atoms of H on the left side and 2 atoms on the right side. It can be balance by putting 3 in front of H2O as shown below:

C2H6O + O2 —> 2CO2 + 3H2O

There are a total of 3 atoms of O on the left side and a total of 7 atoms on the right side. It can be balance by putting 3 in front of O2 as shown below:

C2H6O + 3O2 —> 2CO2 + 3H2O

Now the equation is balanced.

The coefficients are: 1, 3, 2, 3.

Explanation:

From the solution that we have in the question;

The equilibrium constant, denoted as K, is a value that quantitatively represents the ratio of the concentrations of products to reactants at equilibrium in a chemical reaction.

It is a fundamental concept in chemical equilibrium.

The value of the equilibrium constant provides valuable information about the position of equilibrium and the relative concentrations of species involved in a chemical reaction.

Kc = [X] [Y]/[XY]

\(0.25 = (0.1 + x)^2/(0.5 - x)\)

\(0.25(0.5 - x) = (0.1 + x)^2\)

\(0.125 - 0.25x =0.01 + 0.2x + x^2\\ x^2 + 0.45x - 0.115 = 0\)

x = 0.18 M

The equilibrium amount of X and Y=  0.28 M and the equilibrium concentration of XY = 0.32 M

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Based on the answer to the question that we have;

The ratio of the product to reactant concentrations in a chemical reaction at equilibrium is represented quantitatively by the equilibrium constant, abbreviated as K.

It is a cornerstone of the theory of chemical equilibrium.

A chemical reaction's equilibrium position and the relative concentrations of the species involved can both be learned from the equilibrium constant's value.

Kc = [X][Y]/[XY]

\(0.25 = (0.1 + x)^2/(0.5 - x)\\0.25(0.5 - x) = (0.1 +x)^2\\0.125 - 0.25x = 0.01 +0.2x +x^2\\= 0.18 M\)

The equilibrium concentration of;

XY =0.5 - 0.18

=0.32 M

Then the equilibrium amount of

X and Y is

0.1 + 0.18= 0.28 M.

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Answer:

answer

Explanation:

An object that has a small mass and an object that has a large mass have the same momentum. ... Since the kinetic energy of an object is momentum times of speed. Therefore, for the same momentum, the mass of higher speed will have more energy i.e. the smaller mass.

The mass of the cereal that you would need to consume can be obtained as 84.8 g

The number of moles, denoted by the symbol "n," is a fundamental unit of measurement in chemistry that represents the amount of a substance. It is used to quantify the quantity of atoms, molecules, or ions in a sample.

Number of moles of sucrose in the cereal = 11g/342 g/mol

= 0.03 moles

Now;

0.03 moles of sucrose is contained in 60 g of cereal

0.0424 moles of sucrose would contain 0.0424 moles * 60 g/0.03 moles

= 84.8 g

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The volume of the given gas is 5.35 L.

Here we use the combined gas law viz. P1V1/T1 = P2V2/T2, which is  derived from the ideal gas equation PV = nRT, where

PV = nRT

where,

P = pressure

V = volume

n = no. of moles

R = gas constant = 0.0821 L atm/mol K

T = temperature.

Here,

\($P_1\) = 1.40 atm, \($P_ 2\)= 0.989 atm  

\($V_1\) = 3.70 L, \($V_2\) = ?

\($T_1\) = 12.20°C = (12.20 + 273) K = 285.2 K  

\($T_2\) = 20.80°C = (20.80 + 273) K = 293.8  K

substituting the values in the equation  P1V1/T1 = P2V2/T2, we get,

(1.40 x 3.70)/285.2 = 0.989 x \($V_2\)/293.8

\($V_2\) = (1.40 x 3.70 x 293.8) / (285.2 x 0.989)

\($V_2\) = 1521.884 / 284.211

\($V_2\) =5.35 L

Thus, the volume of the gas is 5.35 L.

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Dr. Trane's explanation is based on the psychodynamic perspective while Dr. Uni's explanation is based on the behavoiural perspective. The correct option is option C.

Psychodynamic perspective is a psychological approach that focuses on the unconscious mind and how it affects the behavior. According to the psychodynamic perspective, unconscious urges and conflicts that have their roots in early experiences shape how people behave. This approach is developed by Sigmund Freud.

Behavioral perspective

This is the psychological approach that focuses on observable behavior and the influence of the environment on an individual's actions. According to behaviorists, who also emphasize the significance of understanding and influencing behavior without probing interior mental processes, behavior is learnt through interactions with the environment. The early behaviourists are J.F Skinner, John B. Watson and Ivan Pavlov.

These perspectives are parts of psychoanalysis.

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Gravity causes spacecraft such as stars, planets, moons, and other bodies to orbit one another. Revolution describes this style of movement.

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Answer:

I believe is A

Explanation:

Enthalpy change is the name given to the amount of heat evolved or absorbed in a reaction carried out at constant pressure.

Answer:

when placed in water, a sodium pellet catches on fire as hydrogen gas is liberated and sodium hydroxide forms. chemical change = fire is a sign of chemical reaction.

Explanation:

When placed in water the sodium pellets catch the fire and liberate the hydrogen gas. On mixing with water solid sodium forms a colorless basic solution.

Sodium is a soft metal. It is a very reactive element with a low melting point. Sodium reacts very quickly with water, snow, and ice to produce sodium hydroxide and hydrogen. It is an alkali metal and the sixth most abundant metal on earth. It has a silvery white color.

It has a strong metallic luster. On reacting with oxygen it produces sodium oxide which on reacting with the water produces sodium hydroxide.

It is used to improve the structure of certain alloys and soaps. It is also used in the purification of metals. Sodium is also present in sodium chloride, an important compound found in the environment.

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Answer: A

Explanation:

As one increases the other goes in a straight line.  It is called a direct proportionality.  Forms a linear graph.

The differences between each of the pair is a. secondary and tertiary protein structures of protein.

a. No sharp dividing line exists between

secondary and tertiary structures. Secondary structure refers to the spatial arrangement of amino acids close to one another on a polypeptide chain, whereas tertiary structure refers to the three-dimensional arrangement of all atoms of a polypeptide chain. Among the most important factors in maintaining 3° structure are disulfide bonds, hydrophobic interactions, hydrogen bonding, and salt linkages ; Secondary structure is mainly defines by H-bonding between amino acids in localized regions of a polypeptide or protein

b. Essential amino acids cannot be made by metabolic process of human body, Essential amino acids can be synthesized by human body.

c. The amino acids are divided into 2 categories: those with nonpolar side chains are Non-polar amino acids ( exp. Alanine, Leucine ) , and with polar side chains like acidic side chains ( Aspartic acid) , basic side chains (lysine) and -OH/-SH groups (serine) in side chains are Polar amino acids.

d. A molecule containing two amino acids joined by an amide bond (-CONH-) is called a dipeptide. Those containing 3 amino acids

are called tripeptides. ( di-, tri- indicates No. of Amino acids )

e. Collagen consists of a triple helix made of the repetitious amino acid sequences , it is tertiary structures, whereas a-Helix is Secondary structure.

f. a-Helix, is a type of secondary structure in which a section of polypeptide chain coils into a spiral, most commonly a righthanded spiral. b-Pleated sheet is also

a type of secondary structure in which sections of polypeptide chains are aligned

parallel or antiparallel to one another.

g. Quaternary structure, is The arrangement of polypeptide monomers into

a noncovalently bonded aggregate. Many proteins or polypetides in tertiary structure constitues Quaternary structure.

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The lower the activation energy, or the higher the temperature, the larger the fraction of sufficiently energetic collisions.

For an effective reaction,Particles must collide freqently with sufficient energy .

In order to effectively initiate a reaction, collisions must be sufficiently energetic to break chemical bonds, These bonds are broken and new bonds are formed.

Now in order to break these bonds to produce products,activation energy is reqired.  The higher the  activation energy will cause the  reaction to take place slowly,  While a lower activation energy will make the reaction take place easily because  bonds can be easily broken down.

Also For temperature,   Increasing the temperature will cause more of the molecules to have sufficient kinetic energy leading to  a reaction, while reducing temperature will lead to a slow reaction.

Therefore, Lowering the activation energy, or the raising  the temperature will lead to greater the reaction rate.

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The control test tubes had substrates added but no enzymes and they are test tubes 1, 3, 5, and 7.

The control in an experiment is that variable or quantity to which no change has been applied.

The control in an experiment does not receive the treatment given to the study group or they may only receive a blank or a placebo.

Considering the given  experiment to investigate the influence of temperature on enzyme function:

The control test tubes are those test tubes to which substrates were added but no enzymes were added.

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Complete question:

A student designs an experiment to investigate the influence of temperature on enzyme function. The student's plan is presented in Table 1. Which test tubes are controls in the experiment?

Four peripheral hydrogen atoms and two singly-bonded nitrogen atoms make up the molecule of hydrazine.

Thus, It is a colourless, poisonous irritant and sensitizer in its anhydrous form, which harms the central nervous system and causes symptoms as severe as tumours and convulsions.

In addition to having a strong reducing agent that makes it highly explosive, hydrazine has a strong smell that is similar to that of ammonia.

Given this, it appears odd that over 100,000 metric tonnes of the substance are produced annually throughout the world. But hydrazine does have an impact on our daily activities. It can save our lives, give us food and clothing, keep us warm, and even transport us to the moon. It even has the ability to go back in time.

Thus, Four peripheral hydrogen atoms and two singly-bonded nitrogen atoms make up the molecule of hydrazine.

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Without further details on the specific cell and its components, it is not possible to provide a definitive answer regarding the pH change before and after the cell operates for 20 minutes.

The pH value of a solution can potentially change before and after the operation of a cell, depending on the specific reaction occurring in the cell and the nature of the electrodes involved.

However, without additional information about the specific cell and its components, it is difficult to provide a definitive answer. The pH of a solution is influenced by the concentration of hydrogen ions (H+) in the solution, which can be affected by various chemical reactions, including oxidation and reduction reactions occurring in the cell.

During the operation of a cell, the electrodes undergo chemical reactions, and ions from the electrolyte may participate in these reactions. These reactions can influence the concentration of hydrogen ions and potentially alter the pH of the solution. The direction of the pH change depends on the specific reactions occurring at the electrodes.

For example, in an electrolytic cell, the flow of electric current causes non-spontaneous redox reactions to occur. These reactions might involve the generation or consumption of hydrogen ions, which can affect the pH of the solution.

In a galvanic cell or battery, spontaneous redox reactions take place, and the pH changes can be more complex. The electrode materials, their potential, and the specific reaction kinetics can influence the pH changes in the solution.

Therefore, without further details on the specific cell and its components, it is not possible to provide a definitive answer regarding the pH change before and after the cell operates for 20 minutes. The pH change would depend on the specific reactions occurring in the cell and the behavior of the electrodes involved.

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More molecules in a fixed volume means more pressure.

According to the context, the term may or may not include ions that meet this requirement. A molecule is a collection of two or more atoms held together by attractive forces known as chemical bonds.

Hence, it can be seen that an increase in the number of gas molecules, while container volume stays constant, increases pressure.

A decrease in container volume increases gas pressure. An increase in the temperature of a gas in a rigid container increases the pressure

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Answer:

A dish sponge is considered a heterogeneous mixture. A heterogeneous mixture is one that consists of visibly different components or substances that are not uniformly distributed throughout the mixture. In the case of a dish sponge, it is typically made up of a porous material, such as a sponge or foam, which is combined with other components like detergents or cleaning agents. These different components can be observed as distinct regions or phases within the sponge, making it a heterogeneous mixture.

Answer: ATP hydrolysis

Explanation:

hope this helps<3

The minimum liter of water that must pass through a sample of the compound at 35.2°C to vaporize 1.0 mg of the compound is 0.44 L.

To answer this question, use the ideal gas sales formula:

                                          PV=nRT

P is the ideal gas pressure (Pa).

V is the ideal gas volume (m³).

n is the number of moles of particles (mol).

R is the ideal gas constant with the R value for all gases being the same. R = 8.314 x 10³J/kmol.K.

T is the ideal gas temperature (K).

Using the ideal gas equation

T = 35.2 + 273 = 308.2 K

The molar mass of methyl salicylate = 152.15 gm/mol

number of moles: n = 1 mg/152.15 gm/mol = 6.57 * 10^(-6) mol

PV = nRT

0.278/760 * V = (6.57 * 10^(-6)) * 0.0821 * 308.2

3.6 x 10-4 * V = 1.6x 10-4

                  V = 1.6x 10-4/3.6 x 10-4

                  V = 0.44 L

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Answer:

In Explanation

Explanation:

The empirical formula of a compound is the simplest whole-number ratio of atoms in a molecule. To find the empirical formula of a compound that contains 0.126 mol CI and 0.44 mol O, we can divide the number of moles of each element by the smallest number of moles among all the elements present. This will give us the simplest ratio of atoms in the compound.

First, we can divide the number of moles of CI by the number of moles of O:

CI/O = 0.126 mol / 0.44 mol = 0.2857

This means that for every atom of oxygen, there are 0.2857 atoms of chlorine.

To simplify this ratio, we can multiply both sides of the equation by the smallest whole number which will make the ratio a whole number. In this case, we can multiply by 4, so the ratio becomes:

CI/O = 4*0.2857 = 1.1428

So the simplified ratio of atoms in the compound is 1 atom of chlorine for every 1 atom of oxygen. The empirical formula is ClO

Answer:

Cl2O7

Explanation:

Didn't round ratio.

Answer:

Explanation:

Mg + HCI ---> H2 + MgCl2

Solution,

1 Mg + 2 HCl ---> 1 H2 + 1 MgCl2

So the coefficients needed to balance in order are:-

Answer:

e=mc2

Explanation:

Einstien made the equation for this question

Taking into account the reaction stoichiometry, 0.886 grams of O₂ can be prepared by the decomposition of 12 grams of mercury oxide.

In first place, the balanced reaction of the decomposition of mercury oxide is:

2 HgO  → 2 Hg + O₂

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

The molar mass of the compounds is:

Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

HgO: 2 moles ×216.59 g/mole= 433.18 grams

Hg: 2 moles ×200.59 g/mole= 401.18 grams

O₂: 1 mole ×32 g/mole= 32 grams

The following rule of three can be applied: if by reaction stoichiometry 433.18 grams of HgO form 32 grams of O₂, 12 grams of HgO form how much mass of O₂?

\(mass of O_{2} =\frac{12 grams of HgOx 32 grams of O_{2}}{433.18 grams of HgO}\)

mass of O₂= 0.886 grams

Then, 0.886 grams of O₂ can be prepared by the decomposition of 12 grams of mercury oxide.

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