When determining the significance of digits in a number, the general rule is as follows:
1. Non-zero digits are always considered significant.
2. Leading zeros (zeros to the left of the first non-zero digit) are not considered significant.
3. Captive zeros (zeros between non-zero digits) are considered significant.
4. Trailing zeros (zeros to the right of the last non-zero digit) may or may not be significant, depending on whether they serve as placeholders.
In the number 0.04600, we can label each digit as follows:
0.04600
The first zero is a leading zero and is not considered significant.
The digit 0 after the decimal point is considered significant as it is a captive zero.
The digits 4 and 6 are non-zero digits and are considered significant.
The last two zeros are trailing zeros, and their significance depends on whether they serve as placeholders.
If the zeros in 0.04600 are intended to indicate the precision of the measurement or represent significant figures, then the trailing zeros are significant. In this case, all the digits in the number (0.04600) are significant.
However, if the zeros in 0.04600 are not intended to convey the precision or significant figures, and they are just placeholders, then only the first three digits (0.046) are significant, and the trailing zeros are not significant.
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100 Points! Question in photo
The limiting reactant of the reaction will be aluminum (Al).
What are limiting reactants?In chemical reactions, limiting reactants are reactants that are available in limited quantity. Thus, these reactant determines how much of the products are formed. Other reactants in the same reaction are said to be in excess.
From the equation of the reaction:
[tex]2Al + 2KOH + 6HOH --- > 2 KAl (OH)_4 + 3H_2[/tex]
The mole ratio of Al to KOH to HOH is 2:2:6 or 1:1:3.
Mole of 3.0 g Al = 3/27
= 0.111 moles
Mole of 15 mL, 8 M KOH = 8 x 15/1000
= 0.12 moles
Mole of 75 mL of distilled water = 75/18
= 4.167 moles
From the above number of moles of each reactant and the mole ratio, it is obvious that Al with 0.111 moles is the limiting reactant.
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Answer:
4.0 grams?
Explanation:
I DONT KNOW IF I AM RIGHT but if i am i wish u luck <3
hope i helped
0.4g divalent metal (eq.wt=20) is dissolved in 50cc of 0.64N HCL solution.If further 109.2 cc of NaOH is required to neutralize the resultant solution determine the strength of solution NaOH in g/l ?
An atomic mass is the mass of a chemical element's single atom. It involves the masses of the three atomic subatomic particles: protons, neutrons and electrons.
Volume of Naoh(V1)= 30cc
Normality of Naoh(N1)= 1N
Volume of excess Hcl(V2) = ??
Normality of Hcl(N2) = molarity × basicity
= 2×2 = 4 × 1.01 = 4.04N
Using,
V1N1 = V2N2
30×1 = V2 × 4.04
I.e. V2 = 7.42cc
Volume of excess acid = 7.42 cc
Volume of Hcl neutralized by metal= 100 - 7.42
= 92.575 cc
Therefore, gm.eqv of Hcl = gm.eqv of metal
(92.575/1000) × 4.04 = 4/E
I.e E = 10.09
Atomic mass= E × basicity
= 10.09 × 2
= 20.18amu ans
The atomic mass is 20.18 amu
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Classify the following materials as: pure substance (element or compound) or mixture (heterogeneous or homogeneous) NO. MATERIALS 1. ALUMINUM FOIL 2. AIR 3. SOIL 4. WATER 5. BRONZE 6. ACETIC ACID 7. PENCIL LEAD 8. BLOOD 9. IRON FILINGS 10. GASOLINE Pure Substance or Mixture? Element or Compound Homogeneous or Heterogeneous
A sample of matter with both a definite and unchanging composition and specific chemical properties is referred to as a pure material.
A mixture is a substance comprised of two or more dissimilar chemicals that are not chemically linked.
Classify the following materials as: pure substance (element or compound) or mixture (heterogeneous or homogeneous) .
Materials
Aluminum Foil - Homogeneous MixtureAir - Heterogeneous MixtureSoil - Heterogeneous MixtureWATER - CompoundBRONZE - Homogeneous MixtureACETIC ACID - Homogeneous MixturePENCIL LEAD - ElementBLOOD - Heterogeneous MixtureIRON FILINGS - ElementGASOLINE - Homogeneous MixturePure substances and mixtures are the two broad categories into which matter can be divided. A sort of matter known as a pure substance has qualities and a steady composition throughout the sample. Physically combining two or more elements and/or compounds results in a mixture. The two types of mixtures are homogeneous and heterogeneous. Pure substances include both elements and compounds. Substances made up of multiple atom types are known as compounds. The simplest compounds are called elements because they only contain one kind of atom.
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Which organelle in a cell contains DNA (genetic information)?
(A) mitochondrion
(B) ribosome
(C) chloroplast
(D) nucleus
Answer:
the answer is d the nucleus
Explanation:
the nucleus is like in the middle of a cell and I think is the most important.
hope this helps :)
Provide at least three reasons why studying the periodic trends of elements is important towards
having a good understanding of chemistry
The reasons that studying the periodic trends of elements is important towards having a good understanding of chemistry as the periodic table contain full information regarding an element. The second reason is that it gives brief knowledge about increasing and decreasing of atomic number as well mass of the elements. The third reason is that it shows metals as well as non metals separately.
What is periodic table?Periodic table is defined as a table consist of chemical elements contains a series of atomic number generally in rows due to the reason that elements possesses same atomic number lie in the vertical columns.
Therefore, The reasons that studying the periodic trends of elements is important towards having a good understanding of chemistry as the periodic table contain full information regarding an element. The second reason is that it gives brief knowledge about increasing and decreasing of atomic number as well mass of the elements. The third reason is that it shows metals as well as non metals separately.
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Given the densities of the liquids and solids, label the picture of the test tube with the appropriate position of each substance. Assume the liquids do not mix.
The arrangement of the objects according to density is;
Solids;
Cork
Ice
Silver ring
Gold ring
Liquids
Gasoline
Seawater
Mercury
What is density?The term density is used to describe the value that is obtained as the ratio between the mass and the volume of an object. When we have a mixture of objects, the objects would be separated based on the ones that are denser. We know that the denser liquids would always be found towards the bottom of the vessel that contains the mixture of substances.
Similarly, the solids that are more dense would always tend to sink inside the mixture while the ones that are less dense are closer to the surface.
Now let us arrange the substances according to the densities of each.
Solids;
Cork
Ice
Silver ring
Gold ring
Liquids
Gasoline
Seawater
Mercury
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What is the product of radioactive decay %e called?
• A. A gamma wave
• B. Nuclear fission
. c.
An alpha particle
• D.
A beta particle
Answer:
alpha particle
Explanation:
I'm pretty sure it's supposed to be "daughter", but I see that it's not a choice so my second best choice would be alpha particle
There are numerous starting points that a composer could use when writing a piece of music.
A. True
B. False, dynamics and tempo are the only starting points
C. False, composers never us a starting point
D. False, structure is the only starting point
It's true that there may be numerous starting points that a composer could use when writing a piece of music.
The composer may moreover start at a one-of-a-kind figure depending on the thoughts they've at that minute in time. In other expressions, it may be said that a vocalist or a guitarist is alluded to as a performer for that tally number. A composer is that as it may be an individual who sets a track to a song. Musical composition can talk about a unique piece or work of the track, both vocal or instrumental, the structure of a melodic piece, or the strategy of making or composing an unused piece of music. individuals who make modern compositions are alluded to as composers.
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If 2.25 g of orange mercury oxide decomposes to 2.09 g of liquid mercury and oxygen gas, what is the mass of oxygen produced?
Express your answer to two significant figures and include the appropriate units.
nothing
nothing
The mass, in grams, of oxygen that will be produced from the reaction to two significant figures, will be 0.17 grams.
Stoichiometric problemsMercury oxide decomposes to liquid mercury and oxygen gas. The equation for the decomposition reaction is represented below:
[tex]2HgO + heat --- > 2Hg + O_2[/tex]
Mole of 2.25 g mercury oxide = mass/ molar mass
= 2.25/216.59
= 0.0104 moles
Mole ratio of mercury oxide that decomposes and oxygen gas produced = 2:1.
Equivalent moles of oxygen gas produced = 0.0104/2
= 0.0052 moles
Mass of 0.0052 moles oxygen gas = mole x molar mass
= 0.0052 x 32
= 0.1664 grams
To 2 significant figures, the amount of oxygen gas produced is 0.17 grams.
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What is the molarity of a solution that contains 5.00 moles of solute and 25.00 Liters of solution?
Select one:
a.0.20 M
b.0.89 M
c.0.25 M
d.3.20 M
Answer:
0.20
Explanation:
Molarity= no of moles/volume in litre
=5/25
= 0.20M
Scientific equation of how many gallons is in 1 liter?
Answer:
1 liter = 0.264172 us gallon
Explanation:
What is the mass number for a carbon atom that contains 6 neutrons?
The mass number for a carbon atom which contains 6 neutrons is 12.
Urgent 45 pts
Answer the next five questions based on the diagram:
How many electrons are in the n = 1 shell?
How many electrons are in the n = 2 shell?
How many electrons are needed to complete the n = 2 shell?
How many electrons are being shared between the two nitrogen atoms?
How many bonds exist between the two nitrogen atoms?
Answer:
When n = 1 then it means the first shell of an atom whereas n = 2 means the second shell of an atom and so on.
Explanation:
When n = 1 then it means the first shell of an atom whereas n = 2 means the second shell of an atom and so on.
As every atom consists of three sub-atomic particles which are protons, neutrons, and electrons.
Protons and neutrons reside inside the nucleus of an atom and electrons revolve outside the nucleus of the atom.
A covalent bond is defined as the bond formed by sharing of electrons between the two combining atoms.
Therefore, the given questions are answered as follows.
There are 2 electrons in the n = 1 shell.
There are 5 electrons in its n = 2 shell.
There are 5 electrons in nitrogen's outer shell before sharing electrons.
6 electrons are being shared between the two nitrogen atoms.
Covalent bonds exist between the two nitrogen atoms.
Explanation:
1. In the 1 shell there are 2 electrons
2. in the second shell there are 5 electrons
3. To complete the 2 shell are needed 3 electrons
4. Each of them share 3 elections
5. 3 bonds exist between the two nitrogen atoms
1200cm per hour_______= feet per minute
Dimensional analysis
Answer: 0.656168 Feet per minute
Explanation:
0.656168 feet per minute
Explanation:The formula is:
for an approximate result, divide the speed value by 1829
a mixture contains salt, zinc powder and iron filings. salt is soluble in water while both zinc and iron will dissolve by reacting in hydrochloride acid. describe how you would separate the three components
Answer:
ooooookkkkkkllllloooooooogggggo
What types of clothes should we wear in kitchen cotton or silk ?why?
Answer:
I think cotton
Explanation:
Because in the kitchen ,there is heat that makes us sweat as cotton is a good absorber of water, it will keep us cool in hot atmosphere of the kitchen.
Sorry but please recheck it again this is my analysis
Which element has the largest ionization energy
Answer:
Explanation:
The answer is Xe.
In general, what dose a subscript (such as the “2” in H2) tell about the molecule?
how many there are of each element for example H20 is 2 hydrogen atoms plus 1 oxygen atom
Thinking about valence electrons, which groups would go best together? Name 2 sets
Valence electrons are the electrons present in the outermost shell s and p, or outermost energy level, of an atom.
valence electrons in each group are:-
Groups 3-12 (transition metals)= 2* (Here 4s shell is complete and it cannot hold any more electrons).
Valence electrons determine the electrical conductivity of an element. Depending on the nature of elements it can be metal, non-metal, or metalloid.
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what is electrophoresis ?...
Electrophoresis can be defined as a molecular biology procedure to separate biomolecules depending on the weight and electrical charges.
What is Electrophoresis?Electrophoresis is a molecular biology procedure in which biomolecules such as DNA or proteins can be separated by their electrical charges and weight. For example, DNA has a negative charge thereby it migrates to the positive pole under an electrophoretic field and different DNA molecules can also be separated by their weight in base pairs.
In conclusion, electrophoresis is a technique used in molecular biology laboratories to separate biomolecules depending on the weight and electrical charges.
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If the amount of radioactive iron-59 in a sample prepared for study of iron metabolism in the spleen decreases from 1.6 g to 0.40 g in 84.0 days, what is the half-life of iron-59?
The half life of the radioactive iron-59 is 42 days.
What is half life?
This is the time taken for a radioactive isotope to decay to half of its original size.
The half life of the radioactive iron-59 is calculated as follows;
N(t) = N₀(¹/₂)^t/h
where;
h is the half life of the radioactive iron-590.4 = 1.6(¹/₂)^84/h
log(0.4/1.6) = 84/h log(¹/₂)
-0.602 = 84/h(-0.3)
84/h = 2
h = 42 days
Thus, the half life of the radioactive iron-59 is 42 days.
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The police chief has reported that the evidence from the crime scene has been contaminated. What MOST likely happened in this scenario?
A.
The evidence was collected properly and brought to the lab.
B.
Outside materials were mixed in with collected evidence.
C.
The crime scene was preserved exactly as it was found.
D.
The local court accepted this evidence at a criminal trial.
The MOST likely happened in a situation where the police chief has reported that the evidence from the crime scene has been contaminated is the fact that outside materials were mixed in with collected evidence (Option B).
What does the crime scene mean?The expression crime scene refers to all evidence found in a given place after a crime, which is fundamental to solving this type of police case.
In conclusion, the MOST likely happened in a situation where the police chief has reported that the evidence from the crime scene has been contaminated is the fact that outside materials were mixed in with collected evidence (Option B).
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Which element has an outer energy level that is almost full of electrons? O radium O carbon O krypton O iodine
Explanation:
Hi, I think the answers Iodine.
hope it helps
A scientist is observing a rare monkey in the jungle, and the monkey begins exhibiting an odd behavior. The scientist thinks this behavior may not have been observed in this species before, but he is not certain. The scientist records video of the behavior and takes many detailed notes.
The scientist becomes very excited about his finding and plans to share it with other scientists. The best way for him to communicate and defend his finding would be to
A.
immediately write a report claiming a newly discovered behavior, and then check later to see if others have observed it before.
B.
confirm that the behavior has not been observed before, and then present his finding in a report.
C.
defend his finding as a new discovery, even if another scientist has already published a report about the behavior.
D.
wait until other scientists ask him about his trip to the jungle, and then tell them about his finding.
True or false The density of a subsidence is always the same
Could use some help, thanks. Complete each row of the table below by filling in the missing prefix or missing exponent.
Answer:
if eel u gngg ferr
Explanation:
asdads
Barnacles need a solid structure in the water to attach to and live on, which they can find on a turtle shell. The turtle is unaffected by the presence of the barnacles. That type of relationship bests describes what these two animals have?
the relationship between turtles and barnacles is an example of
co-evolution, where each species is continually adapting to changes with the other.
Barnacles attaches to turtle's shell due to its hardness. Barnacles needs a hard surface to bind with so that it can thrive. A single barnacle doesn’t harm a turtle. But excessive barnacles can make a turtle inactive,also impact its vision and make it difficult to eat, and sometimes lead to infection.
.The cyprid larvae of barnacle has a special attachment devices which allow it to hold onto the substrate, e.g. cup-shaped attachment organs on the antennae. Once barnacle is settled, the barnacle develops into an adult and attaches in different ways as gripping the skin, cementing to the shell or boring into it.
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In which of these statements are protons, electrons,
and neutrons correctly compared?
O Quarks are present in protons and neutrons but not in electrons.
O Quarks are present in protons, neutrons, and electrons.
O Quarks are present in neutrons and electrons but not in protons.
• Quarks are present in protons and electrons but not in neutrons.
Neutrons have no charge, protons have a positive charge, and electrons have a negative charge. One proton's positive charge and one electron's negative charge are equal. While electrons have essentially negligible mass, protons and neutrons each have a mass of 1.
In which of these statements are protons, electrons, and neutrons correctly compared?
"Quarks are present in protons and neutrons but not in electrons."
Protons and neutrons contain quarks, while electrons do not. Subatomic particles known as quarks have mass but no charge at all. Quarks are the building blocks of protons and neutrons, but electrons are not because they are energy travelling with an electric charge rather than matter with mass. Given that quarks have mass, they cannot be found in electrons.
Undoubtedly among the tiniest particles in the universe are quarks. They are fundamental, irreducible, and incapable of being broken down into smaller parts.
The gravitational force, electromagnetic force, strong nuclear force, and weak nuclear force are the only four fundamental physical forces that quarks can freely interact with.
There are six different types of quarks, and they are never found in nature alone; rather, they form hadrons, which are composed of two or three quarks and are referred to as mesons or baryons, respectively.
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Label the zeros in this number as either significant or not significant.
0.02050
The zeros significant or not significant in number 0.02050 is significant zeros is 2 = in 2050 and not significant zeros is 2 = 0.0
Significant and non significant zeros,
All zeros between two non - zeros digits are significant like in 0.0205
All leading zeros are not significant .they are nothing than place holders
All trailing zeros to the right of the decimal are significant.
All trailing zeros in a whole no. with no decimal is not significant.
Here,in the no.
0.02050
↓ ↓ ↓ ↓
not significant || significant
Thus,The zeros significant or not significant in number 0.02050 is significant zeros is 2 = in 2050 and not significant zeros is 2 = 0.0
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(a) Experimental results describing a protein's amino acid composition are useful for estimating the molecular weight (MW) of the entire protein. A quantitative amino acid analysis reveals that bovine cytochrome c contains 2% cysteine (r 121 ) by weight. Calculate the approximate molecular weight of bovine cytochrome c if there are 2 cysteine residues.
(b) Bovine chymotrypsinogen has a molecular weight of 25.6 kDa. Amino acid analysis shows that this enzyme is 9% alanine (r 89.1 ). Calculate how many alanine residues are present in a molecule of bovine chymotrypsinogen. Round your answer to the nearest whole number.
The average molecular weight of bovine cytochrome c = 13800 Da
Explanation:
bovine cytochrome c contains 2 methionine residues
so the 1 mole of bovine cytochrome c will contain 2 moles of methionine residues.
molar mass methionine residue = 149 g/mol
if both residues are present at the terminal, then
'C' terminal eliminates the 'H' group and the 'N' terminal eliminate the 'OH' group
its mass = (2*149) - 1 - 17 = 280 g
mass of methionine residues in 1 mole of bovine cytochrome c = 280 g
mass % of methionine residues in bovine cytochrome c = 2%
mass % = (mass of individual component / total mass of the compound ) *100
mass % of methionine residues = (mass of individual methionine residues/mass of bovine cytochrome c ) *100
mass of individual methionine residues = 280 g
mass % of methionine residues in bovine cytochrome c = 2%
2 = (mass of individual methionine residues/mass of bovine cytochrome c ) *100
(2/100) = (280 / mass of bovine cytochrome c)
0.02 = (280 / mass of bovine cytochrome c)
mass of bovine cytochrome c = 280 / 0.02 = 14000 g
mass of bovine cytochrome c = 14000 g
since this calculation is done for 1 mole of bovine cytochrome c
so the mass of 1-mole bovine cytochrome c = 14000 g
mass of 1-mole bovine cytochrome c = molecular weight of bovine cytochrome c
The molecular weight of bovine cytochrome c = 14900 g/mol
1 g/mol = 1 Da
the molecular weight of bovine cytochrome c when both residues are terminal = 14900 Da
when both residues are not present at the terminal, then
non-terminal eliminate H2O group
mass of residues = 2*(149 -18 ) = 262 g
mass % of methionine residues = (mass of individual methionine residues/mass of bovine cytochrome c ) *100
2 = ( 262 / mass of bovine cytochrome c ) *100
0.02 = 262 / mass of bovine cytochrome c
mass of bovine cytochrome c = 262 / 0.02 = 13100 g/mol
the molecular weight of bovine cytochrome c = 13100 Da
when one residue is N terminal and one is non-terminal
N- terminal eliminate 'OH' group and non-terminal eliminate H2O group
mass of residues = (2*149) - 18 - 17 = 263 g
mass % of methionine residues = (mass of individual methionine residues/mass of bovine cytochrome c ) *100
2 = ( 263 / mass of bovine cytochrome c ) *100
0.02 = 263 / mass of bovine cytochrome c
mass of bovine cytochrome c = 263 / 0.02 = 13150 g/mol
the molecular weight of bovine cytochrome c = 13150 Da
when one residue is C terminal and one is non-terminal
C- terminal eliminates the 'H' group and non-terminal eliminates the H2O group
mass of residues = (2*149) - 18 - 1 = 279 g
mass % of methionine residues = (mass of individual methionine residues/mass of bovine cytochrome c ) *100
2 = ( 279 / mass of bovine cytochrome c ) *100
0.02 = 279 / mass of bovine cytochrome c
mass of bovine cytochrome c = 279 / 0.02 = 13950 g/mol molecular weight of bovine cytochrome c = 13950 Da
taking average all this = (14900 + 13100 + 13150 +13950) / 4 = 55100/4 = 13775 Da
The average molecular weight of bovine cytochrome c = 13775 Da
rounding off to three significant figures
The averages molecular weight of bovine cytochrome c = 13800 Da.
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