percentage of zinc= 5.985/20 X 100= 29.5%
let x represents zinc and y be magnesium so
Zinc(s) + 2HCl(aq) -----> ZnCl2(aq) + H2(g)
Mg(s) + 2HCl(aq) -----> MgCl2(aq) + H2(g)
1.152 g of hydrogen gas=( x/65.3 + y/24.305) 20
= 3.08 x10^-2 + 0.8295-8.30
=x=5.985
y= 4.015
percentage of zinc= 5.985/20 X 100= 29.5%
The hydrogen gas escapes, so the two products of Zinc Chloride and Magnesium Chloride will then react with Silver Nitrate. Again, I combine both of the reactions
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How many electron bonds are shared between tewo carbon atoms when they are joined by a double bond?
2 electron bonds are shared between two carbon atoms when they are joined by a double bond.
An atom is a particle of matter that uniquely defines a chemical element. Atoms consist of a central nucleus surrounded by one or more negatively charged electrons. The nucleus is positively charged and contains one or more relatively heavy particles known as protons and neutrons.
Atoms are made up of two types of elementary particles: electrons and quarks. Electrons occupy the space surrounding the nucleus. Each electron has a charge of -1. Quarks form protons and neutrons, which form the nucleus. About 99% of the human body is made up of atoms of hydrogen, carbon, nitrogen, and oxygen. It also contains much smaller amounts of other elements necessary for life. November 6, 2015
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Name one similarity and one difference between simple diffusion and facilitated diffusion.
Simple diffusion and facilitated diffusion are both similar types of phenomenon.
One similarity between the simple diffusion and facilitated diffusion is that they both are the passive processes. Since, passive process do not require any energy or ATP ( adenosine triphosphate ), both simple diffusion and facilitated diffusion do not have energy requirements. These diffusion process moves or transports the molecules down the concentration gradient, so they do not require energy.One difference between simple and facilitated diffusion is that facilitated diffusion takes place with the help of the action of the transmembrane proteins namely carrier proteins, channel proteins, aquaporins, etc.,In simple diffusion, there is no requirement of such transmembrane proteins. Molecules are transported directly across the cell membrane which is allowed by it.To learn more about diffusion,
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Use the chemical reaction to answer the question.
CaCO3→CO2+CaO
A scientist heats 30 grams of calcium carbonate (CaCO3
) in the chemical reaction shown. What is the total mass of the products?
(1 point)
60 grams
15 grams
30 grams
10 grams
Answer:
Explanation: 15 grams trust me.!!
4. Manik saw his father watering his garden plants in hot weather. He noticed that
water doesn’t stick to the plant leaves and leaves become dry but looked fresh. He asked
following questions to his teacher
a. Which tissue forms the outer covering of a plant and does it have a protective role
to play?How ?
b. Why does water not stick to the leaves?
Water does not stick to the leaves of the plant owing to the fact that the leaves has a waterproof cuticle.
What tissues protects the leaves?We know that the leaves are the parts of the plant that are involved in photosynthesis. Photosynthesis is the process by which green plants produce their own food in the presence of sunlight and chlorophyll. We know that the leave has an outer protective covering.
The tissue that plays this outer covering of a plant for is the epidermis and its waxy cuticle. It prevents damage to the plant.
Water does not stick to the leaves of the plant owing to the fact that the leaves has a waterproof cuticle.
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Write the henderson-hasselbalch equation for a propanoic acid solution (ch3ch2co2h, pka=4.874).
Henderson's Hasselbalch equation for the propanoic acid
[tex]solution \: is \: pH=4.874 + log \frac{[A ^{ - } ] }{HA}[/tex]
This is called known as the Henderson- Hasselbalch equation which relates the pH of an acid aqueous solution with the acid dissociation constant.
[tex]pH=pK _{a } + log \frac{Conjugate \: base}{acid}[/tex]
The Henderson-Hasselbalch equation is derived from the definition of the acid dissociation constant as follows.
Consider the hypothetical compound HA in water.
[tex]HA +H _{2}O→ H _{3} O ^{ + } + A^{ - } [/tex]
The acid dissociation constant of HA,
[tex] [H _3O ^{ + }] = K _a \times \frac{HA}{[A ^{ - } ] }[/tex]
[tex]log [H _3O ^{ + }] = logK_a+log\frac{HA}{[A ^{ - } ] }[/tex]
Multiply both sides of the equation by -1.
[tex]-log[H_3O ^{ + }]=-logK_a-log\frac{HA}{[A ^{-} ] }[/tex]
[tex]pH=pK _{a }+log \frac{[A ^{ - } ] }{HA}[/tex]
[tex][HA] = [A-][/tex]
[tex]pH =pKa +log1[/tex]
[tex]pH = pKa + 0[/tex]
pH=pKa
pKa value of compounds can be determined experimentally using its relation with pH.
According to the Henderson-Hasselbalch equation, when the concentrations of the acid and the conjugate base are the same, i.e when the acid is 50% dissociated, the pH of the solution is equal to the pKa of the acid.
[tex]pK _{a } \: value \: for \: propanoic \:acid \: = 4.874[/tex]
[tex]Let \: propanoic \: acid \: be \: HA.[/tex]
[tex]Let \: propionate \: be \:A ^{ - } .[/tex]
So Henderson-hasselbalch equation for the propanoic acid solution is,
[tex]pH=pK _{a } + log \frac{[A ^{ - } ] }{HA}[/tex]
[tex]pH=4.874 + log \frac{[A ^{ - } ] }{HA}[/tex]
Therefore, Henderson's Hasselbalch equation for the propanoic acid solution is
[tex]pH=4.874 + log \frac{[A ^{ - } ] }{HA}.[/tex]
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Identify the properly written and balanced equation for the precipitation reaction between sodium carbonate and strontium iodide.
The wrote and balanced equation for the precipitation reaction between sodium carbonate and strontium iodide.
(NH4)2S + CoCl2 → CoS + 2 NH4Cl
This equation is properly balanced. There are 2 nitrogen atoms, 8 hydrogen atoms, 1 sulfur atom, 1 cobalt atom, and 2 chlorine atoms on both the left and right sides of the reaction arrow, and all of the compounds are neutral as written.
A balanced chemical formula is one in which the number of atoms of each type in the reaction is the same on both the reactant and product sides. A balanced chemical formula has equal mass and change. A balanced equation is an equation of a chemical reaction in which the number of atoms and total charge of each element in the reaction is the same for both reactants and products. In other words, mass and charge are balanced on both sides of the reaction.
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a 60kg sack of the rice is lifeted with a 30n force what its acceleration
given:
uknow:
formula:
solution:
Saccharomyces cerevisiae causes bread to rise by creating carbon dioxide bubbles as a byproduct of fermentation. select one: a. true b. false
"Saccharomyces cerevisiae causes bread to rise by creating carbon dioxide bubbles as a byproduct of fermentation."
This statement is true.
Fermentation is the technique of making carbon dioxide bubbles that reason the dough to rise.
Carbon dioxide is produced in the course of fermentation and turns into trapped withinside the dough as a small wallet of air. this will increase it. When baked, the carbonic acid expands and the bread rises even extra.
Bread rises due to the fact the yeast eats the sugar and releases the carbon dioxide trapped withinside the gluten of the bread. The extra sugar the yeast eats, the extra fuel line it produces, and the taller the bread rise!
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What mass of agcl will precipitate when 10.0 g of nacl is added to an aqueous solution of agno3?
When 10.0 g of NaCl is added to an aqueous solution of AgNO₃, 24.5 g AgCl will be precipitated.
The balanced chemical reaction is:
NaCl(aq) + AgNO₃(aq) → AgCl(s) + NaNO₃(aq)
Molar mass of NaCl = 58.5 g
Molar mass of AgCl = 143.5 g
Number of moles of NaCl = Given Mass
Molecular Mass
= 10.0 g ÷ 58.44 g/mol
= 0.171 moles
From the reaction,
58.5 g of NaCl produces 143.5 g of AgCl
10.0 g of NaCl will produce 143.5 × 10.0 = 24.5 g AgCl
58.5
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Consider these statements about an element E in group 5A
Osmium has a density of 22.6 g/cm3. what volume (in cm3) would be occupied by a 21.8 g sample of osmium?
The volume occupied by a 21.8 g sample of osmium having a density of 22.6 g/cm3 is 0.965cm3.
The density formula is:
Density = mass/volume
To find volume:
Volume = mass/density
Now
mass = 21.8 g
density= 22.6 g/cm3
Putting the values
Volume = 21.8/22.6
volume = 0.965cm3
Thus the volume is 0.965cm3.
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The volume occupied of the sample of osmium with a density of 22.6 g/cm³ and a mass of 21.8 g is: 0.9646 cm³
The density formula and the procedure we will use is:
d = m/v
Where:
v= volumed= densitym= massInformation about the problem:
d= 22.6 g/cm³m = 21.8 gv = ?Applying the density formula and clearing the volume we get:
d = m/v
v = m/ d
v = 21.8 g / 22.6 g/cm³
v = 0.9646 cm³
What is density?It is a physical quantity that expresses the ratio of the body mass to the volume it occupies.
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suppose you wanted to compare two different stain removers to learn which one was better at removing food stains from clothing. In your test, which variable would you need to control ?
Answer:
The amount/type of stain
Explanation:
You would want to ensure that the stain was the same in both samples.
Conclude Each
year,
the American Chemical
Society holds a national meeting and many
regional meetings for chemists. Reports of
these meetings are then circulated all over
the world Why do you think this has become
standard practice?
Someone please help
This has become common practice, in my opinion, since scientists need to exchange ideas.
I think this has become standard practice because scientists need to share their ideas.Generally, most scientists don't work individually. They cooperate and work in teams. In contrast, a team is more effective than a single person in solving a scientific puzzle.Additionally, when they discuss the meeting reports, it facilitates their ability to agree on the concepts presented.. Every idea is questioned. This accurate evaluation guarantees that scientific knowledge is solidly supported.Also, scientists have to be aware of the latest researches and ideas in their field.To learn more about American chemical society visit:
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A cube of iron, which has a density of 7.87 g/cm3, has an edge length of 3.75 cm. what is the mass of the sample?
A cube of iron, having a density of 7.87 g/cm3, has an edge length of 3.75 cm, the mass of the sample will be - 19.675 kg.
What is the mass of cube?The volume of a cube is really calculated by multiplying the length by the width and then by the height. The formula yields the measurement of one side cubed since all three measures are the same. In this case, 5 x 3 is equal to 125 cm 3. The volume is multiplied by the known density, or the mass per volume.
Iron Density = 7.87 g/cm3
Volume of Iron = 2500 cm3
Mass=(V)(D)
Mass= (2500 cm3)(7.87 g/cm3)
Mass=19,675g
= 19.675 kg
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A student reported that their zinc layer was 18256793.61 atoms thick. what are three things wrong with reporting this number?
Three things wrong with reporting this number are fractional atom, scientific notation and unit of measurement .
1) Decimal fraction of 0.61 is wrong for number of atoms. For number of atoms, whole numbers must be used, not fractional. For example 1, 25 or 565
2) In example like this, large number should be displayed in scientific notation. It depands on the number of significant figures, but this number can be reported as 1.826x10⁸.
3) Number of atoms is not standard for measurement of thickness of the layer. It is better to us nm (nanometers) or some other unit for the lenght.
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answer quick its time
Thomson concluded that _______ have ________ mass than the atom.
Electrons; less
Protons; less
Neutrons; less
Electrons; more
The great scientist Thomson concluded that electron have less mass then atom.
What is Thomson atomic model?Thomson atomic model was proposed by William Thomson. It was strongly supported by Sir Joseph Thomson who had discovered the electron earlier.
According to Thomson atomic model an atom is made up of positively charged sphere into which negatively electron are implanted. The magnitude of the negative and positive charges are same thus the atom is electrically neutral as whole.
Thomson atomic model can also be called as the plum pudding model.
Thus, the great scientist Thomson concluded that electron have less mass then atom.
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Suppose that you are conducting a field experiment with plants. You are testing the hypothesis that plants grow faster when mulch covers the soil. Plan how you would conduct the experiment. Include the types of evidence you would gather. Then plan how you would repeat it.
Start by setting up your materials you would put one plant in mulch and one without. After 2-3 weeks of proper care of the plants you record your findings, did the plant grow more without without the mulch?
A compound that occupies a receptor, but does not activate the neuron is known as a(n):___________
A compound that occupies a receptor, but does not activate the neuron is known as an antagonist.
What is a neurotransmitter receptor?
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.
Is it true that the majority of neurotransmitter receptors are G-protein coupled?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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A dehumidifier tank is emptied once a day. If the capacity of the tank is 2 gallons, determine how many molecules of water the dehumidifier collects from the air per millisecond.
(1 quart = 0.94633 liters; 4 quarts = 1 gallon; density of water is 1g/mL; 18 g water = 6.02x10^23 molecules of water)
I'm terrible with Dimensional Analysis!
A dehumidifier tank is emptied once a day. if the capacity of tank is 2 gallons , Number of Molecules of water the dehumidifier collects from the air per millisecond is 2.92 × 10³² molecules / milliseconds
The capacity of dehumidifier tank = 2 gallons
1 gallon = 4 quarts , 1 quart = 0.94633
1 gallon = 3.785 L
2 gallon = 3.785 × 2 = 7.57 L = 7570 ml
time taken to fill the tank = 1 day
Density of water = 1 g/ml
Mass of water = D × V
= 7570 × 1 = 7570 g
molar mass of water = 18 g/mol
no. of moles = mass / molar mass
= 7570 / 18 = 420.5 moles
now, 1 mole of water contains = 6.022 × 10²³ water molecules
420.5 moles of water = 6.022 × 10²³ × 420.5
= 2.53 × 10²⁶ molecules
2.53 × 10²⁶ molecules collected in 1 day
1 day = 86400 sec
1 sec = 1000 milliseconds
86400 sec = 86400 × 1000 milliseconds
= 8.64 × 10⁷ milliseconds
so, the molecules of water collected per milliseconds
= 2.53 × 10²⁶ molecules / 8.64 × 10⁷ milliseconds
= 2.92 × 10³² molecules / milliseconds
Thus, A dehumidifier tank is emptied once a day. if the capacity of tank is 2 gallons, Number of Molecules of water the dehumidifier collects from the air per millisecond is 2.92 × 10³² molecules / milliseconds
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Describe the energy inputs and outputs of a bonfire.
Answer:
The logs are the input and the flames are the output
Explanation
Rubidium has two common isotopes, rubidium-86 and rubidium-87. If the
abundance of rubidium-86 is 73.2% and the abundance of rubidium-87 is 26.7%,
then what is the average atomic mass of rubidium?
HELP ASAP
The average atomic mass of Rubidium with two common isotopes Rb-86 and Rb-87 is 86.09 amu.
According to the question,
Abundance of Rubidium-86 = 73.2%
Abundance of Rubidium-87 = 26.7%
Steps to calculate the average atomic mass of an element are:
Their percentage abundances are divided by hundred to obtain a decimal value.The obtained value of each isotope is multiplied by its atomic mass.All the isotopic values are added.Therefore,
Rb-86 = 73.2/100 = 0.732
Rb-87 = 26.7/100 = 0.267
Atomic mass of Rb-86 = 0.732 × 85.91 = 62.89 amu
Atomic mass of Rb-87 = 0.267 × 86.91 = 23.20 amu
Hence, the average atomic mass = 62.89 amu + 23.20 amu = 86.09 amu.
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What are the equilibrium partial pressures of coco and co2co2 if coco is the only gas present initially, at a partial pressure of 0.900 atmatm ?
CO CO2
Initial partial pressure 1 0.9
Equilibrium partial pressure 1 - x 0.9 + x
The equilibrium constant is Kp=PCO2/PCO.
Substitute values: 0.259=(0.9+x) / 1−x
Hence, x = . -0.509
Hence, the equilibrium partial pressures of CO and CO2 are 1.509 atm, -0.509 atm respectively.
The pressure that is exerted with the aid of one among the mixture of gases if it occupies the identical quantity on its very own is acknowledged as Partial pressure. Every gasoline exerts sure strain in a mixture.
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what is the frequency of a wave carrying 8.35 x 10^-18 J of energy?
Answer:
Therefore; the wavelength of wave is 6. 9×10−8m.
Answer:
1.26*10^16Hz
Using the planck-einsten equation, you plug in the values and you should get 1.26*10^16Hz.
Write the formula for each compound. capitalization and subscripts are graded. selenium tetrafluoride: oxygen difluoride:
The formula selenium tetrafluoride will be SeF4 and the formula of oxygen difluoride will be OF2.
In chemistry, compounds generally take prefixes and suffixes to signify the quantity of a particular atom in the molecule. For example, prefixes such as "tri-" could signify three atoms while prefixes such as "di-" could show two atoms. For suffixes, "-ide" could show anions that are nearly all electronegative.
Let's take the glance at the compound names step by step :
(a) Selenium tetrafluoride - As the compound has the prefix "tetra-" while fluoride method the appearance of a fluorine atom, we can write down the chemical formula as [tex]SeF_{4} .[/tex]
(b) Oxygen difluoride - Here we have second time the identical convention of the compound, now with the prefix di- which shows two fluorine atoms. The chemical formula will be here [tex]OF_{2}[/tex]
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Place the following compounds in order of increasing boiling point. ch3cl, n2, ch3ch2nh2
The order of increasing boiling points of the following compounds is:
ch3ch2nh2 > ch3cl > n2
The boiling point of CH3CH2NH2 is 16.6°c. The boiling point of CH3CL is -24.2 °C and the boiling point of N2 is -195.8 °C.
The boiling point is defined as the point at which the vapor pressure of the liquid becomes equal to the surrounding atmospheric pressure.
At the boiling point, the liquids start to convert into gaseous form. The boiling points always depend upon the external pressure. For example, the boiling point of certain substances at sea level won't be the same as at mount Everest.
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expression for calculating the charge of an ion
Answer:
Number of protons - number of electrons = charge on ion.
Explanation:
Which is the best carbon-14 radioisotope-labeled compound to add to a cell culture as a means for tracking the products of transcription?
Best carbon-14 radioisotope-labeled compound to add to a cell culture as a means for tracking the products of transcription 14C ribose.
Carbon-14, the longest-lived radioactive isotope of carbon, whose decay allows the accurate dating of archaeological artifacts. C-14 is a radioactive isotope of carbon with an atomic nucleus containing 6 protons and 8 neutrons.it is mostly found in atmospheric carbon dioxide because that is where it is constantly being produced by collisions between nitrogen atoms and cosmic rays.
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Explain how the variation in carbon skeleton contributes to diversity and complexity of organic molecules?
Carbon skeletons may vary in shape, length, number, location and strenght of covalent bonds between carbon atoms.
Element carbon is in group 14 of Periodic table of elements.
Electron configuration for carbon: ₆C 1s² 2s² 2p².
Valence electrons are in 2s and 2p orbitals. There is one pair of electrons in 2s orbital and two lone electrons in 2p orbital with the same electron spin.
A carbon atom has four covalent bonds with other carbon atoms in an organic compound.
Carbon also has different type of hybridization (sp, sp2 and sp3).
The strenght of carbon-carbon bond is approximately 350 kJ/mol.
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What is the electrophile in the friedel-crafts alkylation reaction with tert-butyl chloride?
The tert-butyl cation is the electrophile in the friedel-crafts alkylation reaction with tert-butyl chloride.
What is tert-butyl chloride?
The organochloride with formula (CH3)3CCl is tert-butyl chloride. It is a flammable, colorless liquid. It has a limited water solubility and a propensity to hydrolyze into the equivalent tert-butyl alcohol. As an industrial precursor to various organic molecules, it is created.
In order to create alcohol and alkoxide salts, tert-butyl chloride is a crucial starting material in nucleophilic substitution processes. It is employed in Friedel-Crafts processes and as an alkylating agent for the introduction of the tert-butyl group. It serves as an intermediary in the synthesis of both medicines and agrochemicals.
Originally, this Alfa Aesar product was sold under the Thermo Scientific name. The legacy brand may be mentioned in some documents and label information.
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for number less than 0.1, such as 0.06, the zeros to the right of the decimal point but before the first nonzero digit
For the number less than 0.1 such as 0.006, the zeroes to the right of the decimal point but before the first non zero digit show the decimal place of the first significant digit.
The number that is given as digits is established using significant figures.Any two non-zero digits that are separated by a zero are significant figure.Every zero that is both to the right and left of a non-zero digit and the decimal point is not significant figure. The quantity of significant figures frequently reveals the degree of measurement accuracy. From the first non-zero digits in the figure, we may determine the number of significant figures.There is only one significant figure in the provided number 0.06. The decimal place of the first digit is indicated by the zeros that appear to the right of the decimal point but before the first non-zero digit.
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