an aqueous solution containing 17.5 g of an unknown molecular solute (a nonelectrolyte) in 100.0 g of water has a freezing point of −1.80 °c. what is the molar mass of the unknown compound? kf(water)

bi/o life carcin/o cancer cardi/o heart chem/o chemical cis/o to cut dermat/o skin enter/o small intestine gastr/o stomach

The J-shaped organ that digests food is the stomach. It generates acids and enzymes, which are molecules that cause chemical reactions (digestive juices). Food is broken down by this mixture of enzymes and digestive juices so that it may move to your small intestine. A portion of the gastrointestinal (GI) tract includes your stomach.

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The force of gravity acting on Earth is greater than the force of gravity acting on the cannonball. Option C  is correct.

This is because according to Newton's third law of motion, for every action there is an equal and opposite reaction. When the cannonball is released or fired, it experiences a force of gravity pulling it towards Earth. However, Earth also experiences an equal and opposite force of gravity pulling it towards the cannonball.

Since Earth has a much greater mass than the cannonball, the force of gravity acting on it is much stronger than the force acting on the cannonball. Therefore, the cannonball appears to fall towards Earth, while Earth remains relatively stationary. Option C  is correct.

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Answer:

State of matter is not a chemical property of a substance,

Explanation:

This means that when an objects changes states of matter (such as from solid to liquid), a chemical change does not occur since the substance is the same. When an ice cube melts into water, it is still water. A chemical change only occurs when one substance turns into a different substance. State of matter only has to do with the amount of energy in the particles of a substance and their distance from each other.

Inorganic chemistry is a type of chemistry studies non-carbon based materials

Organic chemistry is defined as the study of carbon-containing compounds, inorganic chemistry is the study of the remaining means not carbon-containing subset of compounds and inorganic chemistry focuses on structures that do not contain carbon and most commonly these structures include oxygen, silicon, aluminum, iron, calcium, sodium and magnesium and inorganic chemistry also studies synthesis, reactions, structures and properties of compounds

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Answer:

in organic chemistry is the type of non carbon based materials.

Explanation: it is a study of behavior and properties of in organic compounds which includes metals, minerals , compounds.

Answer:

To ensure that a spoken or written chemical name leaves no uncertainty concerning which chemical compound the name refers to

Andrew Huston states:

"Without the naming of compounds, we have no idea what we’re dealing with unless if you opt to state the chemical formula. Furthermore, a systematic way of naming compounds allows us to know more about the molecular structure and categorization just by the addition of a few suffixes/infixes/prefixes"

Answer:

Reaction of Iron(III) oxide (Fe2O3) with carbon monoxide (CO) to form iron (Fe) and carbon dioxide (CO2), is a redox reaction as both oxidation of carbon monoxide and reduction of iron is taking place. The equation can be written as: Fe2O3+3CO→2Fe+3CO2.

Explanation:

The silver piece with mass of 44.0 g is an actual silver.

A mass can be defined as a dimensionless quantity representing the amount of matter in a particle or object. The SI unit of mass is kg.

A density is defined as the measurement of how tightly a material is packed together.

To calculate the purity of silver first we have to calculate density of both the silver.

4.0 ml = 4.0 cm3

Density of 20.0 g silver = 20.0g/4.0 cm3 = 5.0 g/ cm3

Density of 44.0 g silver = 44.0g/4.0 cm3 = 11.0 g/ cm3

Thus, the density of 44.0 g of silver is near to density of pure silver hence, 44.0 g of silver is a pure silver.

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Explanation:

For those who like to step beyond the challenge, the mass of the materials could be measured to check the methodology. Prior to separating the mixture, measure the mass of the total mixture. After separating and drying all the materials, measure the mass of each material. Add the three masses together. The total should equal the initial mass if all materials were recaptured during the separation process.

Iron particles will be drawn towards a magnet when one is used. In this manner, aluminum powder and iron powder can be separated. Due to the fact that iron is magnetic but the other three are not.

Magnets are used in magnetic separation, a waste management technique, to remove metal from the trash. As the materials are gathered together and segregated before processing, this is most frequently seen in single and mixed streams of recycling.

This method can be used to eliminate unwanted metals from products. All materials are kept pure by it. Recycling facilities frequently use magnetic separation to isolate metals, purify ores, and separate components from recycling.

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Answer:

Q: how many atom can fit on the head of a pin? About five million million hydrogen atoms could fit.

Explanation:

The ocean water contains a mixture of salt and other larger impurities, as well as a mixture of several gases.

A mixture is a material composed of two or more different chemical substances that are not chemically bonded.

The natural waters salt and other larger impurities, and even a variety of gases. This is classified as a heterogeneous mixture due to larger impurities, whereas some is classified as a homogeneous mixture due to a mixture of several gases and salt.

Thus, the mixture can be said to be heterogenous one.

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The percentage composition of   [tex]NaHCO_{3}[/tex]  in the mixture on titration with mixture with 1.0 HCl is 26.5%

"The process of calculating the quantity of a substance A by adding measured increments of substance B, the titrant, with which it reacts until exact chemical equivalency is obtained (the equivalence point)" is the definition of titration.

However, redox titration and acid-base titration are the two most typical titration types used in quantitative chemical analysis.

[tex]NaHCO_{3}[/tex]    +   HCl   →    NaCl + [tex]H_{2} O[/tex] + [tex]CO_{2}[/tex]

( 23+1+12+48 )    (1+35.5)

=84 g                 =36.5g

HCl consumed when used with  [tex]NaHCO_{3}[/tex]  

[tex]\frac{36.5}{84}[/tex]  x 0.63

= 0.2737 g

HCl in millimoles used with the mixture that is given by the equation;

= molarity x Volume in mL

[tex]\frac{1}{10}[/tex] x 150 =15

HCl weight consumed with the mixture is given by the equation;

= millimoles x mol.wt x [tex]10^{-3}[/tex]

= 15 x [tex]10^{-3}[/tex] x 36.5

= 0.5475g

So, the total HCl =  HCl consumed when used with  [tex]Na_{2} CO_{3}[/tex] +  HCl consumed when used with      [tex]NaHCO_{3}[/tex] .

0.5475 = [tex]\frac{75}{106}[/tex] X y + 0.2737

y = 0.3975

percentage of  [tex]Na_{2} CO_{3}[/tex]  in the mixture:

=[tex]\frac{0.3975}{15}[/tex] x 100

= 26.5%

Hence, The percentage composition of   [tex]NaHCO_{3}[/tex]  in the mixture on titration with mixture with 1.0 HCl is 26.5%.

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Washing soda is a hydrate of sodium carbonate. its formula is na2co3. x h2o. Here, the value of x in the formula is 10.

We are given that:

Mass of washing soda = 2.714g

Molar mass of Na2CO3 = 105.98 g/mol

The molar mass of washing soda = (105.98 + 18x) g/mol

Solution:

The chemical equation is given below:

Na2CO3.H2Ox -------> Na2CO3 + xH2O

1 mole of Na2CO3 produces 1 mole of sodium carbonate (Na2CO3) and x moles of water.

Now number of moles of Na2CO3 = (1.006 / 105.98) = 0.009492 moles

The number of moles of washing soda is equal to the number of moles of Sodium carbonate formed i.e. 0.009492 moles

Now

2.714 / 105.98 + 18x = 0.009294

x = 10.11

x = 10

The value of x in the formula is 10.

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Both strong bonds (covalent and ionic) and weak interactions (van der Waals forces) are important in the function of chemical molecules in an organism.

Now we know that organisms have various kinds of chemical interaction within them. These different kinds of interactions are responsible for the diverse properties we see in the organisms.'

Let us take the DNA molecule for instance, the atoms that compose the bases in the DNA molecule are all held together by covalent interactions. These are strong bonds.

On the other hand, the secondary structure of the DNA molecule owes to the hydrogen bonds and van der Waals forces that occur between the complimentary base pairs that we find in the DNA molecule.

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Answer: depends on the charge.

Explanation:

Let's say you have 9 protons and a charge of -2. Your amount of electrons would be 2 larger than that of your protons. The more electrons, the more negatively charged your atom is.

If there is no charge given or electrons listed, your number of protons (atomic number) will be the same as your number of electrons. In this case, there are 9 protons and 9 electrons.

This might not help, but if you're given no information about charge or electrons, your charge is 0 and you're automatically forced to assume that your number of protons is equal to that of your amount of electrons.

For the net charge to be +3,the mystery charge should be is -2 and net force is towards left.

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Answer:

D, New cells are created by the reproductive system to replace cells that wear out

Explanation:

Because The cells are going through cell division from mitosis causing new cell to form

Answer:

Determine the weight of an object. For example, a glass of water weights 200 grams net (not including the glass).

Find out the volume of an object. In our example, it's 200 cm3 .

Divide weight by volume. 200 g / 200 cm3 = 1 g/cm3

Optionally, change the unit.

Explanation:

The average speed in miles per hour, given the data is 13 miles per hour

Speed is the distance travelled per unit. Mathematically, it can be expressed as:

Speed = distance / time

This is the total distance travelled divided by the total time taken to cover the distance.

Average speed = total distance / total time

The following data were obtained from the question:

The average speed can be obtained as follow:

Average speed = total distance / total time

Average speed = 6.5 / 0.5

Average speed = 13 miles per hour

Thus, the average speed is 13 miles per hour

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The Total mass of potassium hydroxide produced is 26.76g

Potassium (K) has a mass of 18.66 g.

Potassium has a molar mass of 39.098 g/mol.

The mass molar mass of potassium (K) is 18.66 g per mole.

0.477 mol for 39.098 g/mol.

As a result, 0.477 mol of potassium (K) are involved in the water reaction.

This means that when 2 mol of K reacts with 2 mol of water, 2 mol of KOH is produced.

Therefore, 0.477 mol of KOH is produced when 0.477mol of K reacts with water.

As a result, 0.477 mol of potassium hydroxide (KOH) was generated in the given process.

KOH has a molar mass of 56.1056 g/mol.

KOH produced weighs (molar mass)×(molar number) = (0.477 mol)×(56.1056 g/mol) = 26.76g

26.76 grams of potassium hydroxide (KOH) were formed in the reaction as a result.

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Process that work by depositing powder layers solidifying each layer with a laser is selective laser sintering, direct metal laser sintering.

Direct metal laser sintering also called selective laser sintering is a type of metal additive manufacturing or 3D printing. selective laser sintering metal heat the metal powder until it fully melts into liquid but direct metal laser sintering does not melt the metal powder so in that direct metal laser sintering needed less energy.

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The answer would be C8H12O2.

Here is the equation with masses :

1.2743 g CaHbOc + (3.2007 g + 0.9827 g - 1.2743 g) O2 ------> 0.9827 g H2O + 3.2007 g CO2

We are using 32.00 g/mol for O2

We are using 18.03 g/mol for H2O

We are using 44.01 g/mol for CO2

We don't know molecular mass of Hydrocarbon so we permit a,b and c to be any positive real number.

CaHbOc + 2.9091 g / 32.00 g/mol O2 ----> 0.9827 g/ 18.03 g/mol H2O + 3.2007 g/ 44.01 g/mol CO2

Now, calculate the above division

CaHbOc + (0.0909 mol) O2 ------->  (0.0545 mol) H2O + (0.0727 mol) CO2

Matching coefficient we get

a = 0.0727

b = 2 * 0.0545 = 0.109

c = 0.0545 + 2*0.0727 - 2*0.0909

= 0.0181

Divide every number by 0.0181

a / 0.0181 = 0.0727/ 0.0181 = 4.01

b / 0.0181 = 0.109/0.0181 = 6.02

C / 0.0181 = 0.0181 / 0.0181 = 1

Multiply over number by 2

a = 4.01 *  2 = 8.02 ~ 8

b = 6.02 * 2 = 12.04 ~ 12

c = 1 * 2 = 2

Now putting these values we get C8H12O2.

The chemical name of the C8H12O2 is 2-Octynoic acid

Hence the empirical formula of the compound is C8H12O2.

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The compound inequality to determine the Fahrenheit temperature range at which the antifreeze protects the car would be as follows

−30 < 5/9 (F − 32) < 130 or −22 < F < 266

Let us assume that the temperature in degrees Fahrenheit, up to which the antifreeze protects the car is represented by F.

It is given in the question that the formula to convert Celsius temperature to Fahrenheit temperature is,

C = 5/9(F-32), where C is the temperature in Degrees Celcius at which the antifreeze protects the car.

According to the question, C must be between -30°C and  130°C.

-30 < C' < -130

Put in the values, we get

-30 < 5/9(F-32) < -130

Now C = 5/9(F-32)

So, F - 32  =  9/5C

F =  9/5C+ 32

Thus, -30° in degree  Fahrenheit = 9/5(-30) +32 = -54 + 32 = -22

And, 130° in degree  Fahrenheit = 9/5(130) +32 = 234 + 32 = 266

Therefore,  -30 < 5/9(F-32) < -130  and also be written as  −22 < F < 266.

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Answer:

52. 3

53. 2

54. 2

55. 5

Not sure what the line is on number 54, but I think the answer is 2.

Animals contribute to the water cycle mainly through breathing perspiration and the excretion of waste. Animals release water vapor when they exhale which contributes to the water vapor in the atmosphere. Sweat is also released through the pores which then evaporates to help cool their body down. Water is also excreted through urination as well as in their solid waste.

The position of animals within the water cycle is they launch water vapor once they exhale. explanation The water cycle suggests the non-stop motion of water within the earth and ecosystem. Liquid water evaporates into water vapor, condenses to shape clouds, and precipitates lower back to earth as rain and snow. Excretion is an essential part of the water cycle because it contributes to the quantity of water vapor in the air.

Humans and most animals excrete water by sweating, urinating, or defecating. The water molecules in those wastes can also evaporate and be a part of the water vapor suspended within the environment. cellular breathing performs a position inside the water cycle because it makes molecules of water from glucose and oxygen. The hydrogen inside the water molecule comes to form the glucose molecule, C6H12O6, even as the oxygen inside the water molecule comes from the oxygen fuel atom.

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The aim is to use less space while demonstrating the distribution of electrons in shells

If you want to depict how an atom's electrons are scattered across its subshells, an orbital notation is more suited.

This is due to the fact that some atoms have unique electronic configurations that are not readily apparent from textual configurations.

The placement of electrons in orbitals surrounding an atomic nucleus is known as electronic configuration, also known as electronic structure or electron configuration.

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If a heat sink has a temperature of 25°C, the change in entropy of the heat sink when 4000J of heat energy is added to it is 13.42J/K.

Entropy is the measure of the amount of energy in a physical system that cannot be used to do work.

The change in entropy, denoted by ∆S, can be calculated using the following formula:

∆S = Q/T

Where;

According to this question, a heat sink has a temperature of 25°C, the heat temperature when 4000J of heat energy is added can be calculated as follows:

∆S = 4000J ÷ (25 + 273)

∆S = 4000J ÷ 298K

∆S = 13.42J/K

Therefore, if a heat sink has a temperature of 25°C, the change in entropy of the heat sink when 4000J of heat energy is added to it is 13.42J/K.

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The compound is basic in nature but the concentration substance is corrosive.

Sodium hydroxide is a compound that is formed from sodium and hydrogen as well as oxygen The compound is basic in nature but the concentration substance is corrosive.

a) The acute health effect of exposure to NaOH is skin burn while the chronic effect of exposure is damage to the lungs.

b) The first aid for the ingestion of NaOH is to take in plenty of water.

c) The compound is not flammable

d) The chemicals that could produce a dangerous reaction with NaOH are acids

e) To handle small spills, irrigate the affected area with plenty water and use lab coats, gloves and eye wear when working with the solution.

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This is so because extra 2° and 3° alkyl amine can be created by the nucleophilic action of the primary amine that is formed by ammonolysis.

Alkylation of ammonia results in a variety of compounds as a result. Therefore, it cannot be considered as very useful method for preparing Primary amines.

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Vitamins are one of the six classes of food.

Vitamins are one of the six classes of food. Some of the vitamins could be dissolved in water while some can not be dissolved in water. The vitamins that could dissolve in water are called water soluble vitamins while the vitamins that could only dissolve in fat are called fat soluble vitamins.

Now let us classify the vitamins based on description;

Fat soluble vitamins;

Water soluble vitamins;

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