Rubidium lies below potassium in Group 1. Predict the approximate value for the melting point of rubidium. Give a reason for your answer.

The correct answer is 14.8%.

The given reaction,

C_6H_12O_6 ----> 2CO₂ + 2C₂H₂OH

A key idea in chemistry is stoichiometry, which determines the quantity of reactants or products in a chemical reaction and aids in understanding different reactions and the proportions in which they might take place. A combination of two Greek terms is stoichiometry. Stoicheion, which denotes an element, and metron, which denotes a unit of measurement

mole= mass/mole mass

=90g/180g/mol

=0.5mol

According to stoichiometry

1 mol glucose = 2 mol ethanol

0.5 mol C_6H_12O_6 = 1 mole ethanol

mass of ethanol = 1 mole ×46 g/ mol

Theoretical yield = 46 g

percentage = actual yield / theoretical yield × 100

=6.8 g / 46 g × 100 = 14.78% =14.8%

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Answer:

Explanation:

All of the following are duties of United States citizens EXCEPT:

A.

understanding their rights

B.

taking education seriously

C.

understanding what it means to be an active citizen

D.

learning about and understanding foreign governments and laws

Please select the best answer from the choices provided

A

B

C

D

Answer:

The kilogram, meter, and second are the fundamental base units upon which the metric system is built, but seven units of measure are defined from which all the other units are derived: Kilogram: The kilogram (kg) is the base unit of mass. Meter or Metre: The meter (m) is the unit of length or distance.

Explanation:

The two main sets of English units were the Winchester Units, used from 1495 to 1587, as affirmed by King Henry VII, and the Exchequer Standards, in use from 1588 to 1825, as defined by Queen Elizabeth I.

Answer:

I’m not sure! Bacteria are kind of disgusting, but some of them might be helpful.

Explanation:

My opinion since I didn't get to read the article :)

The appropriate designation for an ion with 24 protons, 27 neutrons, and 21 electrons is [^51 Cr24].

How to represent an atom with atomic number and mass?

The smallest component of ordinary stuff that makes up a chemical element is an atom. Each neutral or ionized atom makes up a solid, liquid, gas, or type of plasma. Atoms are very small, with an average diameter of 100 picometers.

Symbolical representation is :

            [ Xz^A] or  [^A Xz]

Where,

A = Mass , X = atom, Z = Atomic number.

The quantity of protons and neutrons in an atom's nucleus is referred to as its mass number.

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2.5 km is the distance you can travel if a car gets 14 kilometers per liter and have 35 liters of gas.

Total distance traveled in 1 liter = 14 km

Total gas in the car = 35 liters

We have to find how much distance can be covered in in35 liters of gas.

Distance is the length of the path traveled between two points. It is the total movement of an object in a direction. It measures length.

Distance = 35/14

Or, distance = 2.5 km

Therefore, the total distance that can be covered by a car in 35 liters of gas is 2.5 km.

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Answer:

2.640

Explanation:

Rounding to the nearest whole number would be 3 if that is needed.

Volume of Iron is therefore 7.8g/cm^3

The formula for [tex]density(\rho) = \frac{Mass(m)}{Volume(v)}[/tex]

m = 7.3g

v = 24.83ml - 23.90ml = 0.93ml

Since 1ml = 1cm^3, the new volume = 0.93/cm^3

Using the formula [tex]\\ density(\rho) = \frac{7.3g}{0.93cm^{3} } = 7.8g/cm^{3}[/tex]

Volume is a measure of occupied third-dimensional space. It is frequently quantified numerically the use of SI derived gadgets (such as the cubic meter and liter) or through a number imperial units (such as the gallon, quart, cubic inch). The definition of size (cubed) is interrelated with volume. The volume of a container is typically understood to be the capability of the container; i.e., the amount of fluid (gas or liquid) that the container may want to hold, as a substitute than the quantity of space the container itself displaces.

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Eight atoms of carbon react with 18 atoms of hydrogen , forming only one molecule of [tex]C_{8} H_{18[/tex] is considered as violation of the law of conservation of mass .

According to the law of mass conservation , neither chemical processes nor physical changes can create or destroy mass in an isolated system . The mass of the products and reactants of a chemical reaction must be equal, in accordance with the law of conservation of mass .

The reaction occur when eight atoms of carbon react with 18 atoms of hydrogen , forming only one molecule of [tex]C_{8} H_{18[/tex] is given as .

8C +18[tex]H_{2}[/tex] → [tex]C_{8} H_{18[/tex]

Mass of reactants = 8 × 12 + 18 × 2 = 132 g

Mass of reactants = 8 × 12 + 18  = 114 g

So , mass of reactant is not equal to the mass of product .

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If a 2.760 g sample of carbon was burned, yielding 10.120 g of carbon dioxide, the grams of oxygen taken up by the reaction was 7.360 g

The balanced equation of chemical reaction is :

C + O₂ → CO₂

Given data is-

Given mass of Carbon- 2.760 g

Amount of carbon dioxide produced- 10.120 g

The molecular mass of carbon dioxide = 44.0 g/mole

To calculate number of moles, equation used is,

 Number of moles (n) = Given mass

                                        Molar mass

            n =      10.120 g      

                      44.0 g/mole

               = 0.23 moles

So, The number of moles of oxygen produced is,

number of moles of O₂ = number of moles of CO₂

n = 0.23 moles.

Now, the molecular mass of oxygen is,

M = (2 × 16.0)g/mole = 32.0 g/mole

Mass of product = number of moles × molecular mass

m = (0.23 × 32.0) g

m = 7.360 g

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The exact density of the water sample with volume 11.3ml and mass 11.349g  is 1.004g/ml.

Density of a solution is defined as the ration of mass of the solution to the volume of the solution. Density is measured in g/cm³ for solids, g/ml for liquids, and g/L for gases.

As per the definition of density ,we can write

Density of solution  = (Mass of the Solution / Volume of the solution)

Mass of the water sample = 11.349g

Volume of water sample = 11.3ml

Density of Water sample = (Mass of water sample/Volume of Water sample)

Density of Water sample = (11.349g / 11.3ml)

Density of Water sample = 1.004g/ml.

The exact density of the water sample with volume 11.3ml and mass 11.349g  is 1.004g/ml.

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A hydrate of cobalt(II) chloride had a mass of 238.0 g before heating. After heating, the anhydrous CoC1, weighed 130.7 g.

from above statement, we found that,

before heating cobalt(II) chloride  = 238.0g

Mass of hydrated  cobalt(II) chloride After heating = 130.7 g

Mass of water = (1238.0 - 130.7) g = 107.39g

moles H2O  = 107.39× 1 mole H2O÷18g H2O

= 5.96 mol H2O.

moles of anhydrous CoCl, remain = given mass of CoCl÷ molar mass of CoCl

=130÷94.5

= 1.375 mole

moles of CoCl₂ = given mass of  CoCl₂÷ molar mass of CoCl₂

= 130÷ 130

= 1 mole.

hydration number = moles of water÷ mole of compound

= 5.96 mol÷ 1

 = 5.96 hydration number

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In a phospholipid, the end of the molecule likely to face towards a nonpolar environment is end with fatty acid chain.

Phospholipids are a group of polar lipids that consist of two fatty acids, a glycerol unit and a phosphate group which is esterified to an organic molecule such as choline, ethanolamine, inositol etc. phospholipids are composed of a phosphate group, two alcohols, and one or two fatty acids. on one end of the molecule are the phosphate group and one alcohol this end is polar, i.e. has an electric charge, and is attracted to water means hydrophilic. the other end, which consists of the fatty acids, is neutral it is hydrophobic and water insoluble.

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The change in the internal energy of the gas is 1.5×10∧3 J.

The internal energy of an ideal gas is directly proportional to the temperature of the gas:

ΔE = 3/2 × n × R × ΔT

ΔT = 320 K - 260 K

ΔT = 60 K; change of the temperature

n = 2.0 mol: amount of a monatomic ideal gas

R = 8.1 J/mol×K;the ideal gas constant

ΔE = 3/2 × 2 mol × 8.1 J/mol×K × 60 K

ΔE = 1500 J

ΔE = 1.5×10∧3 J;  the internal energy of the gas

Isobaric process is a type of process in which the pressure of the system stays constant.

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Correct metal is aluminum

Martina has a sample of an unknown substance she measures the substance. its mass is 13.5 grams, and its volume is 5 cm³ so here density concept is seen.

Density = mass/volume

So 13.5/5 = 2.7

This density is same as aluminum that's why this metal is aluminum.

Aluminum is a chemical element with the symbol Al and atomic number 13  aluminum is a silvery-white, lightweight metal. It is soft and malleable. aluminum is used in a huge variety of products including cans, foils, kitchen utensils.

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Answer:Aluminum

Explanation:

Answer:

Thomson used creativity to interpret the results of the cathode ray tube experiment. Explain how the atomic theory was modified from Dalton's theory to Rutherford's.

When drawing conclusions from the data in a scientific claim , the person making the claim should be trained in that field in which he or she is making claim.

Claim made by scientists in there research or theory is known as Scientific claim. It is based generally on evidences and systematic observation . These claims should be supported by proofs and pre existing theories so that this can be relied on.

But every scientific claim is not true and thus is non reliable because of faults and flaws made during the experiment  and investigation .

Therefore to make a claim reliable , the person making the claim should have abundance knowledge of it and have done sufficient background search of the topic on which he or she is making the claim. Also he or she should be trained in the field in which they are making the claim then only the claim can be trusted and the theories and conclusion can be made out of it.

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Mass of water is 11.52 grams.

Overall chemical equation for reaction of combustion a compound containing only carbon and hydrogen:

CxHy + O₂ → xCO₂ + y/2H₂O

m(CxHy) = 7.02 g; mass of the compound

m(O₂) = 25.5 g; mass of oxygen

m(CO₂) = 21.0 g; mass of carbon dioxide

m(H₂O) = ?; mass of water

Conservation of matter states that the mass of the reactants have to be equal to the mass of the products.

m(CxHy) + m(O₂) = m(CO₂) + m(H₂O)

7.02 g + 25.5 g = 21.0 g + m(H₂O)

m(H₂O) = 32.52 g - 21.0 g

m(H₂O) = 11.52 g; mass of water

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If this molecule of dna originated as a linear molecule with a linking number (l) of 30, which was then circularized and unwound, the l for the unwound circular molecule would be 28.

As unwound circular DNA would result in a reduction of 2 linking numbers, the answer should be 28, since the linking number is constant for a closed supercoiled DNA molecule.

30 - 2 = 28

Nucleotide molecules are the building blocks of DNA. Each nucleotide consists of three parts: a sugar molecule, a nitrogen base, and a phosphate group, which is made up of one phosphorus atom bound to four oxygen atoms. The "letters" that make up the genetic code of our DNA are adenine (A), thymine (T), guanine (G), and cytosine (C), which are the four different types of nitrogen bases.

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If a chemical plant near the source of the river is dumping mercury, then the mercury levels should be highest at the source and lowest at the mouth.

Further testing should show that this is a commonly followed rule. Observations should be explained in a published scientific paper. Scientists look for answers to questions and solutions to problems using a process called the scientific method. This process consists of observation, hypothesis development, and experimental design. Bringing additional observations hypotheses, and experiments in repeated cycles

Chemists use the scientific method to conduct experiments formulate hypotheses formulate laws, and develop theories to better understand how the natural world behaves. In scientific thinking, hypotheses are formed before applicable research is conducted. The theory, on the other hand, is supported by evidence. This is a principle formulated as an attempt to explain what the data already support.

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To prove to someone that the clear material is a mixture and not a compound, you could put the solution in a cup and then let the water evaporate. The baking soda will stay in the cup.

Baking soda is a NaHCO₃. Its chemical name of sodium bicarbonate. It is a salt of carbonates. It is used in making dishes. This is used to make cakes or other fermented foods.

Thus, you may put the solution in a cup and then let the water evaporate to demonstrate to someone that the clear substance is a mixture rather than a compound. The cup will hold the baking soda.

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Suppose that the gene for a protein 500 amino acids in length undergoes a mutation. If the mutation causes the synthesis of a mutant protein in which just one of the 500 amino acids is incorrect.

The mutation is a condition in which there are changes in the DNA and gene. These changes are due to genetic mutation and other bio factors and radiation.

The protein may be folded incorrectly. And the protein will not attain its old structure. Because denature is an irreversible process and does not get the structure of its before.

Thus, the statement is incorrect.

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The energy for the phosphorylation of ADP by ATP synthase is powered directly by H+ concentration across the membrane holding ATP synthase.

Phosphorylation: A biochemical process involving the addition of phosphate to an organic compound. Examples include the addition of phosphate to glucose to produce glucose monophosphate and the addition of phosphate to adenosine diphosphate (ADP) to form adenosine triphosphate (ATP).

Phosphorylation plays an important role in the regulation of many cellular processes including cell cycle, growth, apoptosis, and signaling pathways. Phosphorylation is the most common mechanism used to regulate protein function and transmit signals throughout the cell. Glucose phosphorylation maintains the downward gradient of glucose metabolism and extramitochondrial glucose flux via the pentose phosphate pathway. Induction of the pentose phosphate pathway and generation of NADPH may also help prevent cell death.

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You are given the sodium acetate, hcl (1 m), nahco3, and nahco3 we need na2co3

Here pKa Co=310.3⁴  buffer of pH =9.9

Use nahco3, and na2co3 to prepare 100mL of buffer with 0.1M of concentration here we calculate the given salt,

pH=pKa+log[salt]/[acid]  9.9=10.1+log[na2co3]/[nahco3][na2co3]/[nahco3] = 0.63

[na2co3]+[nahco3]=0.1M

0,63[nahco3]+[nahco3]=0.1 [nahco3]=0.0613M

Moles=molarity×volume=0,0613×100/1000=0.0613moles

[na2co3]=0.1-0.0613=0.938M

Moles=0.938M

Calculated moles will be prepared in buffer in 100 ml solution

Moles=mass/molecular weight

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A compound that occupies a receptor, but does not activate the neuron is known as an antagonist.

A neurotransmitter receptor (also known as a neuroreceptor) is a protein on the membrane that is activated by a neurotransmitter. Chemicals on the cell's surface, such as a neurotransmitter, can bind to the membrane, and receptors can be found along the membrane.

G-protein coupled receptors are found on the majority of neurotransmitter receptors. Neurotransmitter (NT) receptors can be found on the surface of neurons and glia. One neuron sends messages to the other neuron via neurotransmitters at a synapse.

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Answer:

22.68

Explanation:

Since about 2.2 lbs = 1kg, 50 pounds is about 22.68.

The given number is can be written in standard form as 1 times 10 to power negative 10 ( 1 x 10⁻¹⁰).

A standard form is a form of writing a given mathematical concept like an equation, number, or an expression in a form that follows certain rules.

The given number =  1.0 x 10^-10

The given figures can be written in standard form as follows;

1.0 x 10^-10 = 1 x 10⁻¹⁰

Thus, the given number is can be written in standard form as 1 times 10 to power negative 10 ( 1 x 10⁻¹⁰).

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The pressure reading increases.

Pressure (symbol: p or P) is the force applied perpendicular to the surface of an object per unit vicinity over which that pressure is distributed. Gauge stress (also spelled gage pressure)[a] is the stress relative to the ambient pressure.

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Yellow paint has 0.511 % PbCrO4 by mass

Mass of PbCrO4 in 1 kg of paint = (0.511 / 100) * 1 kg = 0.00511 kg = 5.11 g

Moles of PbCrO4 = 5.11 g/ 323.19 g/mol

                           = 0.0158 moles

Moles of K2CrO4 also = 0.0158 moles

Moles of FeCr2O4 = 0.0158 moles K2CrO4 * (4 mole FeCr2O4 / 8 moles K2CrO4)

                            = 0.0079 moles

Mass of FeCr2O4 (chromite) = 0.0079 moles * 223.83 g/mol

                                            = 1.77 g

Paints are divided into two types: oil-based paints and water-based paints. Oil paints are usually used as a primer, undercoat, and topcoat. In the past, we relied heavily on oil-based paints for surface durability and longevity, but today water-based paints are on par. It is used for prolongation and acts as a barrier against environmental influences. Paint consists of pigments, solvents, resins, and various additives. Pigments give the paint its color. Solvents make application easier. The resin helps dry. Additives range from fillers to antifungals. There are hundreds of different natural and synthetic pigments.

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Answer:

Explanation:

O2