The reaction best illustrates the behavior of the weak base h₂po₄- in an solution is:H₂PO₄ (aq) + H₂O (l) ↔ H₃PO₄ (aq) + OH- (aq)
What is a weak base?
A weak base is a base that, upon dissolution in water, doesn't dissociate completely, therefore the resulting aqueous solution contains only a small proportion of hydroxide ions and the concerned basic radical and a large proportion of undissociated molecules of the base.
Contents 1 pH, Kb, and Kw 2 Percentage protonated 3 A typical pH problem.
Examples of Weak Bases.
Ammonia (NH₃) Ammonia could also be a chemical compound with the formula NH ₃. it is a weak base which exists as a colour less gas under standard conditions for ...
2 Trimethylamine (N (CH₃) ₃)₃ Pyridine
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A solution is made by dissolving 4.92 g of glucose (c6h12o6) in to 165 ml of water. the molality of this solution is ________ m, if the density of water is 1.00 g/ml.
The molality of this solution is 0.165 m.
m(glucose) = 4.92 grams; mass of glucose
V(water) = 165.0 mL; volume of water
d(water) = 1.00 g/mL; the density of water
M(glucose) = 180 g/mol; molar mass of glucose
n(glucose) = m(glucose) / M(glucose)
moles of glucose = mass of glucose / Molar mass of glucose
n(glucose) = 4.92 g / 180 g/mol
n(glucose) = 0.027 mol
m(water) = 1.00 g/mL x 165 mL
m(water) = 165 g = 0.165 kg
molality = number of moles / mass of water
b(solution) = 0.027 mol / 0.165 kg
b(solution) = 0.165 mol/kg; molality of the solution
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Apply to explain why a hydrogen atom can become either an ion or a part of a molecule.
Yes, it can be used for either an ion or a part of a molecule.
What is ion?Ions are any atom or molecule having a net electrical charge. A proton's charge, which is generally believed to be positive, is equal to and opposite to the charge of an electron, which is supposed to be negative. It has the ability to either gain or lose one electron, allowing it to change into an ion. It can join a molecule because it can form covalent bonds with other atoms to finish a full valence shell.
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A hydrogen atom can become either an ion or a part of a molecule. It can become an ion because it can lose or gain an electron. It can become an element of a molecule because it can form covalent bonds with other atoms to gain a full valence shell.
What is ion?Ions are any atom or molecule having a net electrical charge. A proton's charge, which is usually believed to be positive, is adequate to and opposite to the charge of an electron, which is meant to be negative.
It has the ability to either gain or lose one electron, allowing it to vary into an ion. It can join a molecule because it can form covalent bonds with other atoms to end a full valence shell.
Why do two hydrogen atoms combine to make a molecule?
Hydrogen has number 1. So it's one electron and 1 proton. So to finish it's octet it need one more electron. So, to become stable it forms hydrogen molecule by sharing it's electron with another H atom and thus forms a chemical bond .
Is hydrogen an ion or neutral atom?
Hydrogen is that the smallest chemical element. it's one proton and one electron, making it neutral. However, the ions of atom are charged species.
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When substance a reacts with substance b, a new substance c is formed. based on this information, we can say that:_________-
When substance a reacts with substance b, a new substance c is formed. based on this information, we can say that the given chemical reaction is spontaneous.
When two or more reactants combine together to form a final product without the loss of any atoms present in the reactants the reaction is known as addition reaction.
If a and b are elements, then they react with each other and form the compound c. Thus this will be the example of combination reaction in which one or more elements combine to form a compound. As no external energy is provided i.e., heat energy or catalyst , so we can also say that the given reaction is spontaneous.
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Around 1750 Benjamin Franklin knew of two opposite types of electric charge, produced by rubbing a glass rod or amber rod with fir. He decided that the charge developed on the glass rod should be "positive" charge, and from there on charges were defined. What would have changed if Franklin had decided the amber rod was the positive charge?
If Benjamin Franklin had decided to call the charge on the amber rod positive, nothing would have changed only that we would have a different convention for identifying charges.
What would have changed?We know that electricity has to do with the flow of current, there are fundamentally two kinds of charge, a positive and a negative charge. We know that the kind of charge that a material carries is arbitrary.
As we can see here, it was Benjamin Franklin in 1750 that defined the charge on the glass rod and the charge on the amber rod as negative. If Benjamin Franklin had decided to call the charge on the amber rod positive, nothing would have changed only that we would have a different convention for identifying charges.
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Body temperature is controlled by a negative feedback control system. the hypothalamus is the ________ for this system.
Body temperature is controlled by a negative feedback control system.
What is negative feedback?
In biological systems, a type of control known as negative feedback occurs when a process's output lowers its own stimulus. A common regulation mechanism in many biological responses is feedback. The body may regulate numerous aspects of its internal environment by permitting particular routes to be switched on and off. This is like turning a switch. Feedback enables a pathway's output to operate a switch. Negative feedback, often known as a "negative feedback loop," happens when a pathway's end product disables the corresponding metabolic step.
In order to maintain body temperature, the hypothalamus reacts to this information by directing nerve impulses to effectors. For instance, the hair erector muscles tighten up if we get too cold. As a result, a layer of air is trapped near to the skin, raising the skin hairs. Systematic negative feedback regulates body temperature.
Thus the hypothalamus is the vital organ for this system.
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A molecule has an empirical formula of ch, and its molar mass is known to be 26 g/mol. What is its molecular formula?.
The molecular formula of a molecule that has an empirical formula of ch and its molar mass is known to be 26 g/mol is C₂H₂
What is the molecular formula?The molecular formula of a compound is the total number of atoms present in a molecule of the compound.
The empirical formula of the molecule is the simplest whole number of atoms of a compound.
The empirical formula of the molecule is ch
The molar mass is 26 g/mol
So, the molecular formula will be C₂H₂ and the compound is acetylene. It is a hydrocarbon.
Thus, the molecular formula of the molecule is C₂H₂.
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Which type(s) of subatomic particles can be located within the nucleus of an atom? electrons only neutrons only protons and neutrons protons and electrons
The type of subatomic particles that can be located within the nucleus of an atom is protons and neutrons. The correct option is C.
What are subatomic particles?Subatomic particles are those particles that are present inside the atoms. These are present in different locations inside the atom. They are charged particles.
An electron is a negatively charged particle that rotates around the nucleus and a neutron is neutral, and a proton is a positively charged particle. Proton and neutrons are present inside the nucleus.
Thus, the correct option is C. protons and neutrons.
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Ca(s) + O₂(g) + S(s) → CaSO4(s)
[?] g 6.400 g 3.206 g 13.614 g
According to the law of conservation of
mass, what is the mass of calcium, Ca,
required to complete this reaction?
Use the correct same precision for the
missing value. (i.e. significant figures).
Help Res
The mass of Calcium required to complete this reaction is 4.008 g.
Law of conservation of mass states that In a closed system, mass cannot be produced or destroyed, but it can be changed from one form to another.The mass of the chemical constituents before a chemical reaction is equal to the mass of the constituents after the reaction.In several disciplines, including chemistry, mechanics, and fluid dynamics, the idea of mass conservation is widely applied.In the given reaction mass of product after completion of reaction is 13.614 g that means total mass of constituents before reaction should also be 13.614.
So,
mass of Ca + mass of O₂ + mass of S = mass of CaSO4
Ca + 6.400 g + 3.206 g = 13.614 g
mass of Ca = 13.614 - 9.606 = 4.008 g
Therefore, by law of conservation of mass 4.008 g of Ca is required for the completion of the reaction.
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claudia performed a flame test in her lab. the result of her flame test is shown here. what scientific questions could claudia ask about the flame? check all that apply. what element causes this flame color? is this the prettiest flame color? will the flame color change if another element is added? will changing the temperature affect the flame color? which flame test does the class like the best?
The scientific questions Claudia can ask about the flame test are (A), (C), and, (D).
The flame test is used to find sure factors, which on heating deliver a particular colour to the flame.
clinical questions are extraordinary from regular questions as they've a prior goal and need to be testable.
a very good scientific question is absolutely reality-primarily based and may be answered through experiment or using previous evidence.
three principal kinds of clinical questions are Verification questions, size, or statement-based totally facts series, which include specific capabilities of an organism or phenomenon.
The clinical questions Claudia ask is-
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A chlorine atom that has gained an electron and has an overall negative charge is an example of a(n) ______. multiple choice question.
A chlorine atom that has gained an electron and has an overall negative charge is an example of an anion. The correct option is a.
What are anions?Anions are the negatively charged particles of the atom. There are two types of ions, anions, and cations. Cations are positively charged ions.
A chlorine atom has gained an electron, when atoms gain an electron, it attains negative charges. So, when a negative charge is attained, it converts into an anion. The element will be called an anion. When it donates electrons, it attains a positive charge.
Thus, the correct option is a, anion.
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The question is incomplete. Your most probably complete question is given below:
anion
cation
proton
ions.
How much energy is needed to raise the temperature of 2g of water 5°C
Answer:this case, the mass is 2.0g, the specific heat capacity of water is 4.18J/g/K, and the change in temperature is 5.0°C=5K , therefore the energy needed to raise it is: 5×2×4.18=41.8J
Explanation:
A teacher carried out a class demonstration on
diffusion similar to that using ammonia (M = 17)
and hydrochloric acid (M = 36.5) (Figure 1.21).
However, they replaced the ammonia with
methylamine (M, = 31), which reacts in a similar
way to ammonia (note that M, is the relative
molecular mass of the substance).
g water
a
Where would you predict the position of the
smoke ring to be in this experiment? Explain
your answer
One of the hydrogens in the NH3 is replaced in the first reaction by the methyl group, or -CH3. The NH3 can have more than one H substituted for it, therefore the final product frequently comprises a blend of methylamine, dimethylamine, and trimethylamine.
A halogenoalkane and ethanolic ammonia can be used in a nucleophilic substitution process to produce primary aliphatic amines like methylamine (CH3NH2).
NH3 + CH3Cl = HCl + CH3NH2
The process is challenging because any unreacted ammonia can react with the generated HCl:
NH3+HCl yields NH4Cl.
Since the N in CH3NH2 still has a single pair of electrons, it can act as a base and interact with the HCl that is created in one of the following ways:
CH3NH2+HCl becomes CH3NH3+Cl.
or as a nucleophile and react with any chloromethane that hasn't been reacted:
(CH3)2NH + HCl = CH3NH2 + CH3Cl
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Florence is only able to find 0. 015 m aqueous ki/i2 on the reagent cart, so they perform a dilution by combining 10 ml of water and 10 ml of the available reagent. They now have 0. 0075 m aqueous ki/i2 which can be used at station c. Is there a difference in the chemical composition of the solution florence made from what was available on the reagent cart?.
Florence is only able to find 0. 015 m aqueous ki/i2 on the reagent cart, so they perform a dilution by combining 10 ml of water and 10 ml of the available reagent. They now have 0. 0075 m aqueous ki/i2 which can be used at station there is no difference in the chemical composition of the solution because water was already present in the solution.
Florence is a type of flask used as an item of laboratory glassware and is named after the city Florence. here Florence flask is only able to find 0. 015 m aqueous Ki/i2 on the reagent cart they perform a dilution by combining 10 ml of water and 10 ml of the available reagent They now have 0. 0075 m aqueous Ki/i2 which can be used at station there is no difference because water was already present in the solution water is only present on the reagent cart.
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After reading “The Human Microbiome” article, you learned that there are trillions of bacteria in the human microbiome. Which of these statements do you agree with most right now?
Bacteria are disgusting! Most bacteria in the human microbiome are harmful.
Bacteria are disgusting! Most bacteria in the human microbiome are harmful.
Bacteria are great! Most bacteria in the human microbiome are helpful.
Bacteria are great! Most bacteria in the human microbiome are helpful.
I’m not sure! Bacteria are kind of disgusting, but some of them might be helpful.
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 :)
What mass of liquid mercury would fill a glass tube with a diameter of 16.0 mm to a height of 25.0 cm? the density of mercury is 13.53gcm3.
The mass of liquid mercury that can fill glass tube is 680.365 gm.
We know that ,
Volume of cylinder = π[tex]r^{2} h[/tex]
where r is the radius of cylinder and h is the height
Here diameter of glass tube is 16mm
Thus the radius r = 8 mm
= 0.8 cm
Volume of glass tube = π [tex]0.8^{2}[/tex][tex]*25[/tex] [tex]cm^{3}[/tex]
Density of mercury given is [tex]13.53gm/cm^{3}[/tex]
We know that
Density = Mass / Volume
∴ [tex]13.53gm/cm^{3}[/tex] = Mass/ π[tex]0.8*0.8 * 25[/tex]
Mass = 13.53 *π0.8*0.8*25
= 680.36 gm
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When 2.16g of mercuric oxide is heated, it decomposes to yield 2.00g of mercury and 0.16g of oxygen. which law is supported by this experiment?
The experiment described in the question given above supports the law of conservation of mass.
What is Decomposition?In chemistry, decomposition may be defined as a type of chemical reaction through which one reactant molecule significantly breaks down into two or more product molecules.
The same concept is applied in the question as well where the heating of mercuric oxide produces mercury and oxygen. According to the question, the mass of the reactant is equal to 2.16g, while the mass of the product is equal to 2.00 g plus 0.16 g which is togetherly 2.16 g.
Therefore, the experiment described in the question given above supports the law of conservation of mass.
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The complete hydrolysis of a protein produces a mixture of? polypeptides free amino acids polypeptides and free amino acids dipeptides and free amino acids
The complete hydrolysis of a protein produces a mixture of free amino acids.
Acids are molecules or ions that can donate protons, known as Bronsted-Lowry acids, or form covalent bonds with electron pairs, known as Lewis acids. The first category of acids is proton donors or Brønsted-Lowry acids.
No oil is either an acid or a base. Neutral. Oil is a neutral, nonpolar chemical. That is, it is a viscous liquid at room temperature. It is immiscible with water, but soluble in alcohol and ether. Whole eggs are relatively pH neutral, but egg whites are one of the few foods that are naturally alkaline, with an initial pH of as high as 7.6 when eggs are laid, but the alkalinity increases as eggs age and reach increases. the pH of 9.2.
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The pancreas releases _________ to buffer the ph of the stomach juices. a strong base to counter the strong acid pepsin nahco3 hcl atpase activating protein
The pancreas releases NaHCO₃ to buffer the pH of the stomach juices.
Balanced chemical equation for reaction of sodium hydrogen carbonate (NaHCO₃) and hydrochloric acid (main acid in stomach juices):
NaHCO₃ + HCl → NaCl + CO₂ + HCl.
Hydrogen carbonate mixed is used to neutralizes stomach acidity, it converts stomach acid (hydrochloric acid) to carbon dioxide.
Buffer is a solution that can resist pH change upon the addition of an acidic or basic components and it is able to neutralize small amounts of added acid or base, pH of the solution is relatively stable.
Other molecules cannot buffer the pH because there are bases or very strong acids.
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Write a short evaluation of the article’s reliability and scientific worth. Support your evaluation with specific examples from the article.
It is important to make sure the information is accurate whether writing a research paper, practising a speech, or working on any other project that depends on data from outside sources.
Investigate the method of determining a source's dependability, credibility, and reliability.Let us write a short evaluation on OZONE HOLE.
A large portion of the Sun's bright radiation is absorbed by the ozone layer, a shield region of the stratosphere. It has a large concentration of ozone.
It contains oxygen atoms that shield the surroundings from harmful radiation, such as brilliant beams, that are emitted by the sun and are available in space.
The ozone opening is less of a gap in the windshield and more of a dip. There is neither a uniform thinning of the ozone layer nor does the ozone disappear through it. The French physicists Charles Fabry and Henri Buisson also discovered it in 1913.
A size of 7.6 million square miles (19.7 square kilometres) was reached by the ozone opening in 2017 before it started to close. The distance increased to 8 million square miles in 2016.
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The formula of the amino acid glycine is c2o2nh5. Deduce the formula of the molecule made from two monomers of glycine.
(C) C4O3N2H8 is the deduced formula of the molecule made from two monomers of glycine.
Of all the human amino acids, glycine has the smallest and most basic structure. The only amino acid whose center carbon is achiral has a side chain made up entirely of hydrogen atoms, and that amino acid is glycine (not a chiral carbon).
In deducing the formula of a compound:
1. Write the symbols side by side, with the basic radical written first and the acidic radical written after.
2. Add each atom's valency to the top of its symbol.
3. Subtract the valency values from their highest shared factor. Radical symbols should be ignored. Alternate the radicals' valencies.
4. To the right of the radicals, write the valency numbers that were switched. Put the radical inside brackets if it consists of a group of atoms and has more than one valency.
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Question correction:
The formula of the amino acid glycine is C2O2NH5. Deduce the formula of the molecule made from two monomers of glycine
A) the information given does not allow such a deduction
B) C4O4N2H10
C) C4O3N2H8
D) C4O2N2H6
E) C4ON2H4
the diameter of a hydrogen atom is about 1.04 cross times 10 to the power of short dash 10 end exponent meters. a protein molecule has an overall length of 1000 times (1 cross times 10 cubed) the diameter of a hydrogen atom.
The diameter of a hydrogen atom is 1.04 × 10⁻⁷ meters.
Diameter or the atomic radius of an atom is a measure of the size of that atom. It is distance from the center of the nucleus to the outermost isolated electron of an atom.
d(H) = 1.04 × 10⁻¹⁰ m; a diameter of hydrogen atom
If a protein molecule has an overall length of 1000 times(1×10³) the diameter of a hydrogen atom, than:
d(protein) = 1.04 × 10⁻¹⁰ m × 1×10³
d(protein) = 1.04 × 10⁻⁷ m; diameter of a protein molecule
Protein is composed of amino acid linked with peptide bond.
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Suppose a sample of butane (c4h10) contains 145 g of carbon (c). use unit analysis to calculate the mass of the butane sample. set up the unit analysis by dragging the necessary components into the conversion factor slots.
Answer:
C
Explanation:
In a phospholipid, the end of the molecule likely to face towards a nonpolar environment is ________________.
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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You add 7.3 gg iron to 23.90 mlml of water and observe that the volume of iron and water together is 24.83 mlml . calculate the density of iron.
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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How many grams of glucose (c6h2o6 molecular mass =180 daltons) would be present in one liter of a 1 m (molar) solution of glucose?
There are 180 grams of glucose in 1 liter of a 1 M solution.
What do we know about glucose?Blood sugar, often known as glucose, is the main sugar found in your blood. It comes from the food you eat and is used as your body's main energy source. Your blood supplies glucose to all of the cells in your body, which then uses it as fuel.
Diabetes is a disorder when your blood sugar levels are too high.
moles = volume x molarity
moles = 1 L x 1 mol/L = 1 mol
mass = moles x molecular weight
mass = 1 mol x 180 g/mol = 180 g(we know that 180 daltons = 180 g/mol)
Therefore, 1 litre of a 1 M solution has 180 grammes of glucose.
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There are 180 grams of glucose in 1 liter of a 1 M solution.
Calculating:
moles = volume x molarity moles
= 1 L x 1 mol/L = 1 mole mass
= moles x molecular weight mass
= 1 mol x 180 g/mol = 180 g(we know that 180 daltons = 180 g/mol)
Therefore, 1 litre of a 1 M solution has 180 grams of glucose
What can we know about glucose?
Blood sugar, often referred to as glucose, is that the main sugar found in your blood. It comes from the food you eat and is employed as your body's main energy source. Your blood supplies glucose to all or any of the cells in your body, which then uses it as fuel.
Diabetes may be a disorder when your blood sugar levels are too high..
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differentiate between an ion and a free radical
The key difference between free radical and ion is that the free radicals have one or more unpaired electron, but ions have paired electrons.
What is the Paired and Unpaired Electrons?
Unpaired electrons are the ones that appear in an orbital alone, while paired electrons are the ones that appear in an orbital as pairs in an atom. So, in the orbital, paired electrons always appear as two electrons, whereas unpaired electrons always appear as a single electron. The main distinction between paired and unpaired electrons is this. Additionally, whereas unpaired electrons result in paramagnetism or ferromagnetism in atoms, paired electrons cause diamagnetism in atoms.
What is Diamagnetism ?A change in the orbital motion of electrons caused by an applied magnetic field induces diamagnetism, a very weak form of magnetism. This magnetism is transient and only endures when an outside field is present.
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Calculate the density of an acid if 138.4 mL of the avid weighs 16.14g
Answer:
[tex]0.12g/cm^3[/tex]
Explanation:
Firstly, you should use this formula :
[tex]Density=\frac{mass}{volume}[/tex]
We know the mass is 16.14g, and volume as [tex]138.4ml[/tex].
Also remember to convert [tex]ml[/tex] to [tex]cm^3[/tex], where [tex]1ml = 1cm^3[/tex]
Therefore, [tex]138.4ml=138.4cm^3[/tex].
Substitute the value :
[tex]\frac{16.14g}{138.4cm^3}=0.1166g/cm^3[/tex]
Rounding it to 2 significant figure :
[tex]0.12g/cm^3[/tex]
Hope this helpedIn normal decimal form and scientific notation
Scientists conducting research found a new type of plastic. They are doing experiments to learn about its properties. Why would the scientists want to repeat their experiments?
Group of answer choices
C. to test different plastics
D. to try to color the plastic different colors
B. to make sure the data they collect are accurate
A. to check that this plastic is the same as another plastic
To make sure the data they collect are accurate
scientific method is a method of procedure that has characterized natural science since the 17th century, consisting in systematic observation, measurement, and experiment, and the formulation, testing, and modification of hypothesesaction research are studies carried out in the course of an activity or occupation, typically in the field of education, to improve the methods and approach of those involvedresearch problem are the tatement about an area of concern, a condition to be improved upon, a difficulty to be eliminated, or a troubling question that exists in scholarly literature, in theory, or in practice that points to the needed for comprehensive understanding and deliberate investigationTo know more about scientific method visit :
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Two+isotopes+of+rubidium+occur+naturally,+rubidium+85+(84.91+amu)+at+72.17%+and+rubidium-87+(86.91+amu)+at+27.83%.+what+is+the+atomic+mass+of+rubidium?
Two isotopes of rubidium occur naturally, rubidium 85 (84.91 amu) at 72.17 % and rubidium 87 (86.91 amu) at 27.83 %. The atomic mass of rubidium is 85.468 μ.
To find the atomic mas of rubidium -
Determining the average atomic mass of an element, we take the average weight of the atomic masses of the naturally occurring isotopes. This means that all the isotopes together are calculated by multiplying the atomic mass and the percentage of abundance. So we have a sum of all the different isotopes ( which is 100 % of abundance)
For naturally occurring rubidium, there are 2 isotopes.
mass of Rb-85 x abundance + mass of Rb-87 x abundance -
84.9118 x 0.7217 + 86.9092 x 0.2783 = 85.46767642 = 85.468 μ
On the periodic table, we can see for Rubidium
85.468 μ which is the average atomic mass of Rubidium and also for its two naturally occurring isotopes.
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