a sample of sodium bromide, nabr, contains 22.34% sodium. if the sample was contaminated with sodium chloride, nacl, would the mass percent of na in the contaminated sample be higher or lower than the pure sample? justify your claim.
In a sample of sodium bromide, NaBr contains 22.34% of sodium. If the sample was contaminated with sodium chloride, NaCl, then the mass percent of Na in the contaminated sample would be higher than the pure sample.
Mass percent can be determined by the formula:
Mass percent = (mass of substance/Total mass of the sample) × 100
The sample contains NaBr which has 22.34 g of Na in 100g of the sample.
If only NaBr was added then, the mass percent would not increase as the the amount of increase in Na is same as the increase in the amount of total sample.
But, NaCl is added as a contaminant so the increase in amount of sample is more than the increase in amount of total sample because the mass of Cl is is less as compared to Br. so, mass percent increases on contamination of NaBr with NaCl
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what is the volume of a 5.0 gram sample of seawater with a density of 1.025 g/mL?
Answer:
since you have both the mass and density of the sample, the volume can be derived from both
volume of seawater = [tex]\frac{5.0}{1.025}[/tex]
= 4.88 ml (3 s.f.)
certain meteorites have been examined and found to carry samples of which molecules? select all that apply.
Some examined meteorites contain would be lipids, nucleotides, amino acids, and monosaccharides.
What are meteorites?Meteorites are considered to be the pieces of rocks or metals that fall into the earth from outer space. These rocks/metals have been extensively studied/analyzed by some researchers, especially those seeking to prove/disprove Panspermia theory that life originates from other planets.
Several studies conducted found the compounds such as lipids, DNA, RNA, and amino acids.
There has been no evidence for the monosaccharides for a long time until 2019 when an international team discovered sugars such as xylose and arabinose in certain meteorites.
No polypeptide has been discovered in the meteorites, but its precursor, amino acids, have been discovered.
Therefore, the correct answer to the molecules that have been found in the some meteorites would be lipids, nucleotides, amino acids, and monosaccharides.
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Ecologists use food web diagrams, like the one shown, as tools in their studies of different populations of organisms within an ecosystem. Which of the following is a correct use for a food web diagram?
Ecologists use food web diagrams as tools in their studies of different populations of organisms within an ecosystem because it shows the feeding relationship between organisms in the ecosystem.
What is a Food web?This is defined as the graphical representation of the feeding relationship which occurs between organisms in the ecosystem and helps to predict the outcome in the addition or removal of a species.
The food web also helps to determine the various ways in which energy flows and it usually starts from the producers which are the plants as a result of their photosynthetic ability which involves the conversion of solar energy to chemical energy.
There are various organisms in the ecosystem and the food web helps to provide a better understanding of their feeding habits and impact various factors will result in.
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What descriptive term is applied to the type of diene represented by 2,4-hexadiene?.
The descriptive term applied to the type of diene represented by 2,4-hexadiene is conjugated diene.
Dienes are compounds which contains two double bonds. These dienes can be non conjugated or conjugated.
Conjugated diene are those compound which have two double bonds joined by a single σ bond. Conjugated dienes can also be called 1,3-diene. To know if diene is conjugated or non conjugated, sp³ hybridization is to b checked and the number of double bonds and single sigma bond is checked.
Conjugated dienes are found in many different molecules. 2,4-hexadiene is a conjugated diene with two carbon-carbon double bonds that are separated by one sigma bond.
The stabilization of dienes by conjugation is better than the aromatic stabilization. Conjugated dienes are more stable than non conjugated or cumulative diene because it has higher electron density of molecules delocalized.
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Arrange the following aqueous solutions in order of increasing boiling points. 0.050 m mg(no 3) 2; 0.100 m ethanol; 0.090 m nacl
To arrange the following aqueous solutions in order of increasing boiling points. 0.050 m mg(no 3)2; 0.100 m ethanol; 0.090 m nacl.
What is boiling point of a solution?
The temperature at which a liquid's vapor pressure equals the pressure around it and the liquid transforms into a vapor is known as the boiling point of a substance.
A liquid's boiling point varies depending on the atmospheric pressure in the area. The boiling point of a liquid is lower in a partial vacuum than it is at atmospheric pressure. A liquid's boiling point is lower under low pressure than it is under air pressure.
The higher the molar concentration, higher will be the boiling point of the solution.
Thus among Ethanol(0.100m), Mg(NO3)2(0.050m), NaCl(0.090), ethanol has the highest boiling point.
Thus, increasing order of boiling point is:
Mg(NO3)2<NaCl<Ethanol
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Repeating an entire experiment more than once is
Replication
Trial
Research
Experiment
Answer: Replication duh NO offensene
Explanation:
a 6 carbon glucose molecule is broken down t 2 molecules of 3 carbon pyruvate cleavage, where ater molecule is broken off a frucose 1-6 bisphophate
In glycolysis, one glucose (a 6-carbon molecule) is broken down into 2 pyruvate molecules (each 3-carbon molecule). this process occurs in two separate reactions. a particular toxin, Changchun, found in poison slugs, targets one of these reactions and renders the carbons in that particular pyruvate radioactive and thus, unstable.
What is glycolysis?
Glycolysis is the process in which glucose is broken down to produce energy. It produces two molecules of pyruvate, ATP, NADH, and water. the method takes place in the cytosol of the cell cytoplasm, within the presence or absence of oxygen. Glycolysis is the primary step of cellular respiration.
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Formation of hydrogen bonds requires hydrogen atoms and what else? polar covalent bonds water ionic bonds oxygen
Formation of hydrogen bonds require hydrogen atoms and Oxygen atoms, fluorine atoms, or nitrogen atoms.
Hydrogen bond is a special case of dipole-dipole force of attractions. Here there are two polar molecules in which one of them has hydrogen atom with partial positive charge on it and the other molecule can be O, F or N with partial negative charge. Since, these dipole-dipole force of attractions are stronger than other dipole-dipole force of attractions we name it as Hydrogen bonds.
Some of the examples where hydrogen bonding is present are- H₂O, HF, NH₃ etc
Since, Hydrogen bonds are a type of dipole-dipole forces of attraction, they are present in polar covalent molecules.
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The energy for passive transport comes from: group of answer choices atp gtp the gradient of the thing being transported secondary transporters protein pumps
Passive transport obtains energy from the gradient of the substance or molecule being transported.
Passive transport is the movement of a solute from one side of the cell membrane where there is a high electrochemical potential to the other side where there is a lower electrochemical potential.
A kind of cellular transport known as passive transport involves the movement of molecules and ions along concentration gradients. In contrast to active transport, the mechanism doesn't need metabolic energy (such as ATP) because the movement is downhill or down the concentration gradient.
A few characteristics of passive transport are as follows:
1) The molecule must be bound in order to be transported.
2) The chemical being delivered is particular to it.
3) The gradient of the material being carried produces the energy needed for passive transport.
4) A conformational shift leads to the substance's transport.
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icolaou, k. c.;montagnon, t.; baran, p. s.; zhong, y.-l. iodine (v) reagents inorganic synthesis. part 4. o-iodoxybenxoic acid as a chemospecifictool for single electron transfer-based oxidation processes.j. am.chem. soc.2002,124, 2245.
Oxygen is a good oxidant because it has the highest electronegativity, which is 3.44.
What is an oxidant ?A reactant that oxidizes or eliminates electrons from other reactants in a redox reaction is referred to as an oxidant. An oxidizer, oxidizing agent, or oxidant are several terms for the same thing. An oxygenation reagent or oxygen-atom transfer (OT) agent is a term that may be used to describe an oxidant that contains oxygen.
The loss of electrons in oxidation (OIL RIG). A material that oxidizes therefore steals electrons from the other substance. As a result, an oxidizing agent needs to pick up electrons.
Flourine is the most effective oxidizer. The highest positive electrode potential value is present in it. Halogens function as a potent oxidizing agent because of their high electronegativity and electron affinity.
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How can cells be in osmotic equilibrium but chemical and electrical disequilibrium?
Cells be in osmotic equilibrium but chemical and electrical disequilibrium because water moves freely between most cells and the extracellular fluid
When the concentrations are equal on both sides of the membrane called osmotic equilibrium in cell this results in zero osmotic pressure as there is no force needed to prevent any flow. in other words, the tonicity is the same on both sides of the membrane. by diffusion of water or solutes, osmotic balance ensures that optimal concentrations of electrolytes and non-electrolytes are maintained in cells in this method osmosis maintain equilibrium in the cell not chemical and electrical equilibrium that's why osmotic equilibrium in the cell but chemical and electrical disequilibrium in the cell.
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If there are 5.80 moles of h, how many moles of each of the compounds are present?
[tex]Moles \: of \: H _2SO_{4} \: is \: is \: 2.9 \: moles.[/tex]
[tex]Moles \: of \: C _2H _4O _2 \: is \: 1.4 \: moles. [/tex]
[tex]Moles \: of \: NaOH\: is \: 5.8 \: moles.[/tex]
The total number of moles of hydrogen in all the compounds = 5.8 mol.
The number of hydrogen present in sulphuric acid = 2.
Let the number of moles of the sulphuric acid present
be X. [tex]Number \:of \: mol \: of H_2SO _4 \:present [/tex]
is,
[tex]1 \: mole \: of \:H _2SO_{4} \: has \: 2 \: moles \: of \: H.[/tex]
[tex]X = 5.8 \times \frac{1}{2} [/tex]
[tex]X = 2.9 \: moles[/tex]
Thus, the number of moles of sulphuric acid present is 2.9 moles.
Number of hydrogen present in acetic acid = 4
Let the number of moles of acetic acid be Y.
[tex]Number \:of \: mol \: of C _2H _4O _2 \:present [/tex]
is,
[tex]Y = 5.8 \times \frac{1}{4} [/tex]
[tex]Y = 1.4 \: moles[/tex]
Thus, the number of moles of acetic acid is 1.4 moles.
The number of hydrogen present in sodium hydroxide = 1.
Let the number of moles of sodium hydroxide be Z.
[tex]Number \:of \: mol \: of \: NaOH\:present [/tex]
is,
[tex]Z = 5.8 \times \frac{1}{1} [/tex]
[tex]Z = 5.8 \: moles[/tex]
Thus, the number of moles of sodium hydroxide is 5.8 moles.
5.8 moles. [tex]Therefore, \: moles \: of \: H _2SO_{4} \: is \: [/tex]
[tex]is \: 2.9 \: moles. \: \:Moles \: of \: C _2H _4O _2 \: is[/tex]
[tex]is \: 1.4 \: moles. \: Moles \: of \: NaOH\: is[/tex]
5.8 moles.
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Chernobyl expelled lots of cs-137 radioisotopes in the environment in 1986. the half-life of cs-137 is 30 years. in 2046, 60 years later, the radioactivity will be _____ the original activity in 1986.
Chernobyl expelled lots of cs-137 radioisotopes in the environment in 1986. the half-life of cs-137 is 30 years. in 2046, 60 years later, the radioactivity will be zero times the original activity in 1986.
What is half life of a substance?
A drug's half-life is an estimation of how long it will take for its concentration or amount in the body to exactly halve (or 50%) in size. T12 represents half-life.
This well-known phrase was first used in 1907 by renowned physicist Ernest Rutherford, who used the half-life formula to estimate the age of rocks by observing how long radium took to decay into lead.
Here, its said that the half life of Cs-137 is 30 years, that is after 30 years, half of the Cs-137 would have disintegrated, and after 60 years the entire molecule would have disintegrated, hence, after 60 years that is in 2046 the radioactivity would be zero.
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Complete and balance the following redox reaction in basic solution. zn(s)=zn(oh)42-(aq) h2(g)
The Balanced redox reaction is:
[tex]2H_2O + Zn (s) + 2OH^- \rightarrow Zn(OH)_4^2^- (aq) + H_2 (g)[/tex]
In that total redox reaction,
one half reaction of cell is [tex]Zn \rightarrow Zn^2^+ + 2e^-[/tex]
the other reaction is [tex]2OH^- + 2e^- + 2H_2O \rightarrow H_2 + 4OH^-[/tex]
Redox reactions are balanced in basic solution just as they would be in acid. You utilize [tex]OH^-[/tex] for conversion to base at the end.
The steps for balancing a redox reaction in a basic solution are as follows:
1. Split the reaction into half reactions.
2. Balance the other elements, except H and O.
3. By adding water, the O atoms are balanced.
4. By adding [tex]H^+[/tex], balance the H atoms.
5. To remove any [tex]H^+[/tex], add [tex]OH^-[/tex] ions to both sides.
6. To create [tex]H_2O[/tex], combine [tex]H^+[/tex] and [tex]OH^-[/tex].
7. Make things simpler by removing extra water.
8. Equalize the charges by including [tex]e^-[/tex]
9. Combine the half reactions, then simplify.
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A molecule with a long chain of carbons bonded together and flanked by hydrogens with an acid group on one end and a methyl group on the other end is called a?
A molecule with a long chain of carbons bonded together and flanked by hydrogens with an acid group on one end and a methyl group on the other end is called a fatty acid.
A fatty can be saturated as well as unsaturated. Saturated fatty acids are the ones that do not have any double or triple bond in them. Unsaturated fatty acids are the ones that have double bonds or triple bond in them.
Some of the examples of fatty acids are stearic acid, palmitic acid, linoleic acid etc.
Some common examples of food products having fatty acid in them are walnuts, fish, butter, milk etc.
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When titrating a weak acid with a strong base, the ph half way to the equivalence point is 2.4. what is ka for this acid? will the ph be acidic, basic, or neutral at the equivalence point?
When titrating a weak acid with a strong base The equivalence point for a weak acid-strong base titration has a pH > 7.00.
If the concentration of weak acid is adequate to the concentration of the conjugate base, then the ratio of their concentrations is adequate to one. and therefore the log of one is equal to zero. Therefore, the pH is adequate to the pKa value of the weak acid at the half equivalence point
Why is pH at half titration adequate to pKa?
Because of the incomplete dissociation of the acid, the reaction is in equilibrium, with an acid equilibrium constant , Ka, which is restricted to that acid. point are the identical . Therefore, at the half-equivalence point, the pH is adequate to the pKa.
What does one mean by titration?
titration, process of qualitative analysis in which the quantity of some constituent of a sample is determined by adding to the measured sample an exactly known quantity of another substance with which the desired constituent reacts in a definite, known proportion
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he famous miller–urey experiment was conducted in 1953. this experiment tested the hypothesis that primitive earth conditions were favorable for creating complex organic compounds from simple compounds. classify the compounds according to whether they were inputs or outputs in this experiment.
Answer:
C
Explanation:
Of the following, which atom has the smallest atomic radius?
a. sr
b. po
c. te
d. ba
The atom that has the smallest atomic radius is Tellurium(Te).
The modern periodic table contains 118 elements which have been divided into 18 groups horizontally and 7 periods vertically, as shown in the adjoining diagram.
In the second diagram, the trends that vary across periods and groups are shown.
We can see that the atomic radius increases on going down the group in the periodic table and decreases on moving left to right.
We have to compare the radius of the following four elements:
Strontium Sr (Group 2, Period 5)
Polonium Po (Group 16, Period 6)
Tellurium Te (Group 16, Period 5)
Barium Ba (Group 2, Period 6)
Among the above elements, Tellurium has the smallest atomic radius according to the trends in the periodic table.
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reaction of sodium hydroxide and iron(ii) chloride to give to give iron(ii) hydroxide and sodium chloride
The reaction equation is; 2NaOH(aq) + FeCl2(aq) ---- > 2NaCl + Fe(OH)2
What is the reaction equation?The term reaction in chemistry involves the combination of two or more substances to yield a new substance. The new substance is always different from the combining substances.
In this case we want to write a reaction equation for the reaction between sodium hydroxide and iron(ii) chloride to give to give iron(ii) hydroxide and sodium chloride, we can write;
2NaOH(aq) + FeCl2 (aq) ---- > 2NaCl + Fe(OH)2
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After electrophoresing his pcr reaction, the student sees the desired pcr product on the gel as well as several smaller bands. what error(s) might he have made? (select all that apply.)
The following errors in the PCR reaction could lead to the result obtained:
He performed step two at a temperature that was too low.
Repeated sequences were present in the designed primers.
He contaminated the DNA sample used as a template.
Polymerase Chain Reaction (PCR) is a molecular biology technique used for the amplification of DNA fragments with the help of Taq polymerase at a high temperature.
A very tiny DNA sample can be amplified (or part of it amplified) to a size that is big enough to be studied in depth using the polymerase chain reaction (PCR), a technique that is frequently used to create millions to billions of copies (full or partial) of a given DNA sample quickly.
When the temperature for step 2 of PCR, annealing is too low, the primers do not get attached to the template DNA.
Dimers could arise when the primers include repeated sequences.
Contamination of the template DNA will lead to no PCR and thus little to no results.
The complete question is:
A student carries out PCR using the following steps:
Step 1: 94°C for 1 minute
Step 2: 60°C for 30 seconds
Step 3: 72°C for 30 seconds
After electrophoresing his PCR reaction, the student sees the desired PCR product on the gel as well as several smaller bands. What error(s) might he have made? (Select all that apply.)
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Which formulas both represent compounds? HELP ME PLS!
Answer: D
Explanation: Co 2 and H2O
The variables for this experiment include mass, volume and the materials in the various balls, as well as their
densities. In Part II, you will be comparing an inflated football with a deflated one. Use the drop-down menus to
complete the sentences and identify the independent and dependent variables.
The mass of air inside the balloon is an independent variable, whereas the balloon's volume is a dependent variable.
When compared to the deflated balloon, the expanded balloon has a bigger capacity.
The following are some of the variables connected to the inflated and deflated balloons:
volume of the balloon and the amount of air inside it
The amount (mass) of air inside the balloon determines the balloon's volume.
What are dependent and independent variable ?There are often two different sorts of variables in analytical health research. We anticipate that independent variables will have an impact on dependent variables. What occurs as a result of the independent variable is referred to as a dependent variable.
As a result, we can say that the balloon's volume is a dependent variable and its air mass is an independent variable.
The balloon's volume grows as the volume of air inside it does.
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How much of the water (in mlml ) contains 160 mgmg of pbpb ? (assume a density of 1.0 g/mlg/ml .)
The amount of water is 14545.29 mL will contain 160 mg of lead.
Density is a term used to describe how tightly a material is packed. Hence, density is defined as the mass of the body per unit volume. Density Formula: ρ = m / V, where is the density, m is the object's mass, and V is its volume. Density Symbol: D.
The solution has 160 mg of Pb.
The density of water is 1 g/ml.
Now, 0.0011% Pb by mass means 0.011 grams P is contained in 100 - 0.0011 = 99.9989 g of water.
Therefore,
160 mg or 0.160 g of Pb will be contained in:
0.106 g × ( 99.9989 / 0.0011 ) = 0.106 g × 90908.09 = 14545.29 grams of water.
Hence, 14545.29 mL of water contains 160 mg of Pb.
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The molecular formula for both cis-2-butene and trans-2-butene is c4h8. compounds which have the same molecular formula but have different structures are called:______.
The molecular formula for both the cis-2-butene and trans-2-butene is c4h8. The compounds which have the same molecular formula but have different structures are called isomers.
What are isomers?Isomerism, the existence of molecules that have same numbers of the same kinds of atoms (and hence the same formula) but differ in chemical and physical properties.
Stated colloquially, isomers are chemical compounds that have same parts but are nonetheless not the same. To make crude analogy, two bracelets, each consisting of five red and five green beads, could be arranged in many different isomeric forms, depending on the order of the colors.
Each bracelet would have the same parts—that is, five red and five green beads—but each variation would be different. One could also imagine combinations of those same beads in which the pendant chains were attached to a bracelet in a variety of ways. One might imagine two bracelets of the same red-green order but with the identical chains attached in different orientations. Such structures also would be analogous to the isomers. In a more subtle analogy, one’s hands can be seen as an isomeric. Each hand possesses same kinds of fingers, but a right hand can never be superimposed perfectly on a left hand; they are different.
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what is the overall charge of the most abundant tripeptide species at neutral ph (ph 7.0)? enter your answer as a whole numbe
The most abundant tripeptide species at neutral ph (ph 7.0) the overall charge 0
A peptide consisting of three amino acids. a tripeptide is a peptide derived from three amino acids joined by two or sometimes three peptide bonds function of peptides is determined by the constituent amino acids and their sequence Glutathione (γ-glutamyl-cysteinyl-glycine) is the example of tripeptide called tripeptide. here at 7 ph the overall charge of the most abundant tripeptide species is 0 because at 7 ph means it is in neutral condition so net charge is 0
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explain why the keto-enol equilibrium constant for dimedone is much greater than the constant for acetone.
The strength of a carbon-oxygen double bond exceeds that of a carbon-carbon double bond.
What is a double bond?A double bond is a covalent link between two atoms in chemistry that involves four bonding electrons rather than the two in a single bond. In alkenes, for instance, double bonds typically form between two carbon atoms.
There is always a sigma and a pi bond present in a double bond. Carbon dioxide is a common instance of a chemical having a double bond. The structure of organic substances like ethene, commonly referred to as ethylene, methanoic acid, and acetone, includes double bonds.
Carbon-carbon double bonds are found in alkenes, which are hydrocarbons. For molecules with a single double bond, their typical formula is CnH2n ( no rings). Because ethene was originally called olefiant gas, another name for alkenes is olefins.
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mass = 10g
volume = 25mL
Find the density, Remember: density = mass/volume
Answer: p = 4.0E-7 g/cm^3
Please help me! This is due in 10 minutes, WILL GIVE BRAINLIEST!
Acrylonitrile and ethyl acetate have the same boiling point: 77.2ºC. In one to two sentences, explain what outcome you would expect if a mixture of these two substances were distilled
Answer:
Acrylonitrile and ethyl acetate will be collect together since they both have the same boiling point. The method of distillation between the boiling points of the acrylonitrile and ethyl acetate. Since they have the same boiling point the two substances turn into vapor at the same temperature and are collected simultaneously. Hence separation is not achieved by distillation
Explanation:
UwU
have a nice day!
Mylie~
What do the conclusions tell about the experiment?
O A. The conclusions tell how the experiment should be repeated.
B. The conclusions tell what other scientists think about the
experiment.
C. The conclusions tell if the scientific method was followed.
D. The conclusions tell why the data support or reject the hypothesis.