Answer:
As the atomic number is half of the atomic mass then it probably have 304/2 = 152 atomic number that will be placed before atom having atomic number 153 and after atom that have 151 atomic number.According to all its properties it will be somewhere in the left or middle of the periodic table and will be at the bottom. At the bottom in the super actinide metals series.Explanation:
Data Given:
Predict place of element in the periodic Table having following properties
mass number = 304 amu
Ionization energy = very low
bonds = easily bond with other elements
melting point = 50.1° C
electronegativity = smallest
Atomic radius = largest
metallic character = great
color = silver
Periodic Table is the table where elements were placed based on their atomic number.
In 1913 Mosley construct the periodic table according to their atomic number.
Modern Periodic Law :
the physical and chemical Properties of the elements are the periodic functions of their atomic number.
Atomic Number:
Atomic number is the number of electron or proton, denoted by Z
Z = e or P
Atomic Mass:
Atomic mass is the number of proton plus neutron in the nucleus. it is denoted by A.
A = P + N
Atomic number is almost half of the atomic mass for majority of the element.
Periodicity of periodic Table:
properties of the element repeat itself at certain interval.
Periodicity of Properties is as follow
1. Ionization energy:
The Ionization energy increase from left to right and decreases down the group.
2. Electronegativity:
E.N increase from left to right and decreases down the group.
3. metallic character:
Metallic character increase down the group and decrease from left to right. metals have metallic color, bristle and shiny surface.
4. non-metallic character
Non-metallic character decreases down the group and increases from left to right.
5. Melting point and boiling Point:
Melting point and boiling Point increases when the metallic character increase and decreases when the metallic character decreases.
6. Atomic radius :
Atomic Radius decrease from left to right and increases from top to bottom as shells are added.
Now keeping in mind all above points, to predict the place of the atom whose properties are given.
As the atomic number is half of the atomic mass then it probably have 304/2 = 152 atomic number that will be placed before atom having atomic number 153 and after atom that have 151 atomic number.According to all its properties it will be somewhere in the left or middle of the periodic table and will be at the bottom. At the bottom in the super actinide metals series.1s22s22p63s23p64s23d104p65s24d105p5
What is the name of the element?
The element with the electronic configuration 1s²2s²2p⁶3s²3p⁶4s²3d¹104p⁶5s²4d¹105p⁵ is Iodine (I).
Explanation:The electronic configuration provided, 1s²2s²2p⁶3s²3p⁶4s²3d¹104p⁶5s²4d¹105p⁵, corresponds to the element Iodine (I). Iodine is a member of the halogen group, situated in group 17 of the periodic table. This halogen is commonly known for its use in antiseptics and as a necessary component of the human diet.
Group 7A (or VIIA) of the periodic table are the halogens: fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At). The name "halogen" means "salt former", derived from the Greek words halo- ("salt") and -gen ("formation").
Final answer:
The electron configuration corresponds to the element iodine (I), which is located in group 17 of the periodic table and has an atomic number of 53.
Explanation:
The electron configuration given in the question corresponds to an element's distribution of electrons across different orbitals. The full configuration is:
1s²2s²2p⁶3s²3p⁶4s²3d¹4p⁶5s²4d¹5p⁵
When assessing this electronic arrangement, we look at the last energy levels or shells being filled, which are 5s, 4d, and 5p. By looking at the periodic table, we can match this configuration to an element.
Considering that the 5p sublevel contains 5 electrons, we look at the p-block of the periodic table, in the fifth period (row). Counting in from the left of the p-block (taking into account the s-block and d-block orbitals which come before in the period), we find that the element iodine (I) matches this electronic configuration.
Therefore, the last electron enters the 5p subshell, and with 5 electrons in 5p subshell, confirms that the element is iodine (I).
Iodine is located in group 17, which comprises the halogens, and it has an atomic number of 53. Thus, the name of the element with the given electron configuration is iodine.
Whats the chemical
formula of the compound?
Answer:
CBrClF₂
Explanation:
You list the halogens in alphabetical order and use a subscript 2 to show that there are two F atoms.
The formula is CBrClF₂.
The name of the compound is bromochlorodifluoromethane.
The process by which a solid changes to a liquid is
Answer:
the process is melting
Explanation:
got it right on edge
A female bear leaves her bear cubs in their den to go out in search of food. She travels one mile in 30 minutes, heading east. She travels quickly at first, but then she becomes tired and begins moving more slowly. She finds no food, so she then heads north for another 10 minutes. She finds a river so she is able to catch a few fish for her bear cubs. She then turns around and heads back toward her den. She travels southwest and returns home to feed her cubs.
Identify and describe all points of acceleration in the scenario about the bear and her cubs.
Make sure to explain why each example is a point of acceleration.
Answer:
Points of acceleration:
1. When female bear goes quickly
2. After becoming tired, when she becomes slow
3. When she changes direction from east to north
4.When she slows down when she reaches the river bed
5. When she turns around
6.When she increases speed to travel southwest to return home
7. When she comes to a stop at home
Explanation:
1. When she is going quickly she is increasing her velocity thus positively accelerating
2. When she becomes slow, she is having negative acceleration.
3. When there is a change in direction of velocity there is an acceleration.
4. Again negative acceleration when she comes to a stop at the river bed
5. Turning around to the southwest direction requires acceleration
6. To increase the velocity to reach home, positive acceleration
7. To decrease the velocity to stop upon reaching home, negative acceleration
Chemistry tests that are not stat are typically drawn in what type of tube
Final answer:
Chemistry tests like blood tests for plasma analysis generally use tubes containing K2EDTA, followed by centrifuging. Urinalysis, on the other hand, uses disposable test strips without prior sample preparation.
Explanation:
Chemistry tests that are not stat (immediate) are typically drawn in various types of tubes depending on the tests to be carried out. For tests that require plasma, blood samples are usually collected into tubes containing K2EDTA and then centrifuged to obtain plasma.
The plasma samples may sometimes be quenched with methanol before analysis. This is different from urinalysis, where physicians often use disposable test strips to measure the amounts of various substances in a patient's urine, without the need for any preparation before analysis. The diverse techniques and sample preparations in clinical chemistry underscore the importance of tailoring collection methods to specific tests, allowing for accurate and comprehensive diagnostic assessments in medical laboratories.
What is a atom of chemistry
Answer:
Atom is the smallest particle of matter.
Elements are made up of same atoms.
Atom consist of electron, proton and neutron.
Explanation:
Atom was first discovered by John Dalton.
word "Atom" came from Greek word, that means something that could not split. he explained that atom is indivisible particle.
In the end of 18th century J.J. Thomson put forward a new concept of atom. he said that atom have negative charged particles called electrons but overall atom is neutral.
In 1909 Rutherford with his students discovered positive charged particles and nucleus and said that it is in the center of atom.
He explain a model of atom and said that electrons revolve around a hard core in the center called nucleus.
In 1913 Niels Bohr explains the atomic spectra and put forward the concept of shells and sub-shells.
So overall Structure of an Atom is
consist of Neutrons in nucleus+ve charged protons in nucleusA -vely charged electrons revolving around the nucleusthe electron revolve in shells i.e. K, L, M, and N Each shell divide in sub-Shell such as s, p,d and f.Atom has a specific atomic mass and atomic number
Atomic number = number of protons or electron
Atomic mass = number of protons + number of neutrons in nucleus.
C12H22O11(s) + H2SO4(aq) + 1/2 O2(g) → _C(s) + CO2(g) + 12H2O(g) + SO2(g)
What law is demonstrated by this chemical reaction shown by the equation above, when this equation is balanced?
Answer:
Law of Conservation of Mass
Explanation:
tells us that matter is neither created nor destroyed during any chemical reaction
A chemical reaction is a process that leads to the chemical transformation of one set of chemical substances to another.
A balanced chemical equation occurs when the number of atoms involved in the reactant side is equal to the number of atoms on the product side.
As the reaction,
[tex]C_{12}H_{22}O_{11}(s) + H_2SO_4(aq) + \frac{1}{2}O_2(g) --> CO_2(g) + 12H_2O(g) + SO_2(g)[/tex]
As the reaction, it states the law of conservation of mass
Law state that the mass of the elements remains the same during the course of a reaction.
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What is the volume of 40g of sugar given it’s listed density
Answer:
25.157 cm³
Explanation:
Data Given:
Mass of Sugar (m) = 40g
Density of sugar given in literature = 1.59 g/cm³
Volume of Sugar = ?
The formula will be used is
d = m/v ........................................... (1)
where
D is density
m is the mass
v is the volume
So
Rearrange the Equation (1)
d x v = m
v = m/ d ................................................ (2)
put the given values in Equation (2)
v = 40g / 1.59 g/cm³
v = 25.157 cm³
volume of 40 g of sugar = 25.157 cm³
Final answer:
To calculate the volume of 40g of sugar, divide the mass by the substance's density, which is not provided in the question. An example calculation with a hypothetical density of 1.59 g/cm³ gives a volume of approximately 25.16 cm³.
Explanation:
The volume of a substance can be calculated using its mass and density. To calculate the volume of 40g of sugar, we need to know the density of sugar. Unfortunately, the density is not provided in the question. However, we can use the method of conversion once the density is known. If the density of sugar was, for example, 1.59 g/cm3 (which is hypothetical in this case), the volume would be calculated as follows:
Volume = Mass / Density
Volume = 40g / 1.59 g/cm³
Volume ≈ 25.16 cm³
Ensure to substitute the correct density value of sugar in the same units to get the accurate volume.
What is the specific heat of an unknown substance if a 2.50 g sample releases 12 calories as its
temperature changes from 25°C to 20°C?
Taking into account the definition of calorimetry, the specific heat of the unknown substance is 0.96 [tex]\frac{calories}{gC}[/tex].
CalorimetryCalorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.
Sensible heat is defined as the amount of heat that a body absorbs or releases without any changes in its physical state (phase change).
So, the equation that allows to calculate heat exchanges is:
Q = c× m× ΔT
where
Q is the heat exchanged by a body of mass m. c: specific heat substance. ΔT is the temperature variation.Specific heat of an unknown substanceIn this case, you know:
Q= - 12 caloriesc= ?m= 2.50 gΔT= Tfinal - Tinitial= 20 C - 25 C= - 5 CReplacing in the expression to calculate heat exchanges:
-12 calories= c× 2.50 g× (-5 C)
Solving:
-12 calories÷ [2.50 g× (-5 C)]= c
0.96 [tex]\frac{calories}{gC}[/tex]= c
Finally, the specific heat of the unknown substance is 0.96 [tex]\frac{calories}{gC}[/tex].
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The specific heat of the substance is 0.96 cal/g°C, calculated by rearranging the formula q = mcΔT and substituting the known values for heat transferred, mass, and change in temperature.
Explanation:The formula for calculating the specific heat (c) of a substance is:
q = mcΔT
where:
q is the amount of heat transferred,m is the mass of the substance,ΔT is the change in temperature.To find the specific heat, rearrange the formula to solve for c:
c = q / (mΔT)
In this example, the given values are:
q = -12 cal (since the heat is released, it is negative),m = 2.50 g,ΔT = 20°C - 25°C = -5°C (since the temperature decreased, ΔT is negative).Plugging in these values gives:
c = -12 cal / (2.50 g x -5°C)
c = 12 cal / (12.5 g°C)
c = 0.96 cal/g°C
The specific heat of the substance is therefore 0.96 cal/g°C.
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convert 3.0x1p^24 molecules H2O=________ mol H2O
Answer:
3.0x1p^24 molecules H2O=____5____ mol H2O
Explanation:
We une the number of Avogadro:
6, 02 x 10 ^23 molecules------- 1 mol
3, 01 x 10 ^24 molecules----x=
x= (3, 01 x 10 ^24 moleculesx 1 mol)/6, 02 x 10 ^23 molecules)
x= 5 mol
the building blocks of the universe are called ______.
1)ions
2)elements
3)compounds
4)nuclei
"Nuclei " are called as building blocks of the universe.
Option: D
Explanation:
Smallest unit of this universe was considered to be an atom but “Rutherford 's Nuclear Model of Atom” in 1911 discovered nucleus which is small and heavy positively charged body present in center of atom. An atom also have extra nuclear part which is space around nucleus, where electrons (negative charged) are distributed. Nucleus is contained with protons (positive charged) and neutrons (neutral) which are definitely very smaller than nuclei but as a building unit or block of the universe nuclei is considered.
A large molecule of Tryptophan ( C11 H12 N2 O2) has a molar mass of about 612g/mol. What is it’s molecular formula?
C₃₃H₂₄N₆O₆ is the molecular formula of the large molecule of tryptophan (which is a derivative of tryptophan molecule)
Explanation:
For the large tryptophan molecule we have been given the empirical formula C₁₁H₁₂N₂O₂. The molecular formula will be (C₁₁H₁₂N₂O₂)ₐ which have the molar mass of 612 g/mol.
Now we calculate the molar mass of (C₁₁H₁₂N₂O₂)ₐ:
molar mass of (C₁₁H₁₂N₂O₂)ₐ = (12 × 11 + 1 × 12 + 14 × 2 + 16 × 2) × a
molar mass of (C₁₁H₁₂N₂O₂)ₐ = 204a g/mol
Now to find "a" we do the following calculus:
204 × a = 612
a = 612 /204
a = 3
The molecular formula of large molecule of tryptophan will be:
(C₁₁H₁₂N₂O₂)₃ = C₃₃H₂₄N₆O₆
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Which of the following pairs of elements is most likely to form an ionic bond? Sulfur and Oxygen Carbon and Chlorine Phosphorous and Bromine Aluminum and Nitrogen
“Aluminum” and “Nitrogen” form an ionic bond.
Option: D
Explanation:
Aluminum and nitrogen are most likely to form an “ionic bond” among given pairs of elements in form of aluminum nitride. AlN is partially covalent and also show ionic characteristics as N needs 3 electrons to fill outer shell and Al has 3 electrons in valence shell. Hence [tex]\mathrm{Al}^{+3}[/tex] is cation and [tex]\mathrm{N}^{-3}[/tex] is anion and have “electrostatic force” of attraction between these oppositely charged ions. Here ionic behavior is seen as nitrogen is more “electronegative” hence attract the shared pair of electrons which is earlier responsible for partial covalent bond formation.
Why are electromagnetic waves used instead of sound waves?
Answer: Electromagnetic waves are not like sound waves because they do not need molecules to travel. This means that electromagnetic waves can travel through air, solid objects and even space. This is how astronauts on spacewalks use radios to communicate. Radio waves are a type of electromagnetic wave.
Explanation:
Answer:
Electromagnetic waves can travel in vacuums.
Explanation:
Scientists use different types of telescopes to find and study supernovas. Some telescopes use visible light to observe the supernova's colors, while others study the X-rays and gamma rays dispersed in the explosion. These electromagnetic waves are used because electromagnetic waves can travel in vacuums, like space, whereas sounds waves cannot. In addition, the electromagnetic spectrum travels at the speed of light (much faster than sound waves), can be absorbed, and are not created by physical vibrations.
In which of the following sets are the charges given correctly for all the
ions?
O A) Na, Mg+, Ait
OB) K+, Sr2+, 02-
OC) Rb', Ba-, p3+
OD H2+, Lit, Ne
Answer:
B) K⁺, Sr²⁺ , O²⁻
Explanation:
Potassium is present in group one. It is alkali metal and have one valance electron.Potassium need to lose its one valance electron and form cation to get complete octet.
That's why it shows K⁺.
Sr is alkaline earth metal. It is present in group two. It has two valance electrons. Strontium needed to lose its two valance electrons and get stable electronic configuration.
When it loses its two valance electrons it shows cation with charge of +2.
Sr²⁺
Oxygen is present in group 16. It has sex valance electrons. It needed two more electrons to complete the octet. That's why oxygen gain two electron and form anion with a charge of -2.
O²⁻
Hector uses the apparatus below to separate a mixture. [image}
How do the substances compare?
A. Substance 1 has a lower density than Substance 2.
B. Substance 1 has a higher density than Substance 2.
C. Substance 1 has a lower boiling point than Substance 2.
D. Substance 1 has a higher boiling point than Substance 2.
Answer:
The answer for this question is option D
solids < liquids < gases
Which option states a property of matter that matches the order of the states of matter in the flowchart?
Select all that apply.
kinetic energy of particles
density of matter
space between particles
speed of particle motion
Answer:
space between particles
Explanation:
Properties of gases:
Molecule of gases randomly move everywhere and occupy all available space.
Gases don't have definite volume and shape and take the shape and volume of container in which it present.
Their densities are very low as compared to the liquid and solids.
Gas molecules are at long distance from each other therefore by applying pressure gases can be compressed.
The very weak inter molecular forces are present between gas molecules.
Properties of Liquid:
Liquid have definite volume but don,t have definite shape.
Their densities are high as compared to the gases but low as compared to the solids.
In liquid, molecules are close to each other and have greater inter molecular forces as compared to the gas molecules.
Properties of solids:
Solids have definite volume and shape.
In solids molecules are tightly pack and very close to each other.
Their melting and boiling point are every high.
The densities of solids are also very high as compared to the liquid and gas.
There are very strong inter molecular forces are present between solid molecules.
450g of chromium(iii) sulfate reacts with excess potassium phosphate. How many grams of potassium sulfate will be produced? (ANS: 6.0*10^2g K2SO4) I need the working and there are a couple more of these if someone's tryna help my dumb self.
Answer:
600 g K₂SO₄
Explanation:
First write down the complete, balanced chemical equation for such question. In this case:
Cr₂(SO₄)₃ + 2K₃PO₄ → 3K₂SO₄ + 2CrPO₄
Next, calculate molar masses of required compounds mentioned in the question. In this case it is for Cr₂(SO₄)₃ and K₂SO₄.
Molar mass(MM) of Cr₂(SO₄)₃:= 2*(MM of Cr) + 3*( MM of S) + 3*4*( MM of O)
= 2*(52) + 3*(32) + 12*(16)
= 104 + 96 + 192
= 392 g
Molar mass(MM) of K₂SO₄:= 2*(MM of K) + 1*( MM of S) + 4*( MM of O)
= 2*(39) + 32 + 4*(16)
= 78 + 32 + 64
= 174 g
Here comes the concept of Limiting reagent:
The limiting reagent in a chemical reaction is the substance that is totally consumed when the chemical reaction is complete. The amount of product formed is limited by this reagent, since the reaction cannot continue without it. The other reactants present with this are usually in excess and called excess reactants. If quantities of both the reactants are given, then one should apply unitary method and find out the limiting reagent out of the two. Then, determine the amount of product formed or percentage yield.
Also, 1 mole( 392 g) of Cr₂(SO₄)₃ gives 3 moles( 174*3 = 522 g) of K₂SO₄.
Using unitary method, if 392g of Cr₂(SO₄)₃ gives 522 g of K₂SO₄ , then 450 g of Cr₂(SO₄)₃ will give how much of K₂SO₄?
Yeild of K₂SO₄ : [tex]\frac{522 * 450}{392}[/tex]
That is 599.3 g.
Since we have not considered molecular masses of individual atoms to 6 decimal places, this number can be approximated to 600g.
Therefore, 600g of K₂SO₄ is produced.
What is the best way to combine these sentences? The frogs front feet have 4 toes. Its back feet have 5 toes
Answer:
The frog has 4 toes on each foot in the front, and 5 toes on each foot in the back.
Explanation:
View the table.
Which would be the most appropriate headers for column
1 and column 2?
1
sugar
ice
diamond
S
AS
rubber
wax
plastic
column 1 Atoms
column 2. lons
column 1 Crystalline
column 2 Noncrystalline
column 1. Definite shape
column 2. Definite volume
column 1 Viscous
column 2 Nonviscous
Answer:n creating a table from a dataset that does not have a column and a row, the most important thing that you have to ... The answer to your question is C. column headers.
Explanation:
Answer:
column 1: they are solids that form crystals.
column 2: Are liquid solutions.
Explanation:
Crystals are solids, some of them can have viscosity like glass.
Liquid solutions, are formed by some ions dissolved in water, so they can have a definite volume and could be a liquid that is nonviscous because they are dissolved in water.
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can formaldehyde molecules dissolve well in water?
Answer:
Formaldehyde is highly soluble in water.
Explanation:
Formaldehyde is the simplest of the aldehydes (R−CHO) it is an organic compound which occurs naturally with the formula H−CHO. . The IUPAC name of formaldehyde is methanal.
Formaldehyde at room temperature is a colorless gas and the liquid is invisible or like white-water. Formaldehyde has an irritating and very pungent like odour. Formaldehyde is very soluble in water.
Now according to Henry's constant law (3 × 10-5 kPa·m3/mol) Formaldehyde will be very unlikely to volatilize from water.and hence, Formaldehyde is considered to be highly soluble in water.
How much energy is required to heat a 40 g sample of ice with an initial temperature of -10°C until it reaches a final temperature of 105°C
Answer:
The total energy required is 121.56 kJ
Explanation:
The energy required to heat a m = 40g sample of ice is calculated using the following information:
The specific heat of ice =[tex]s_{ice}[/tex] = 2.108 J/g-K
The specific heat of water =[tex]s_{water}[/tex] = 4.187 J/g-K
The specific heat of steam = [tex]s_{steam}[/tex] = 1.996 J/g-K
The latent heat of fusion for ice = L = 336 kJ/kg
The latent heat of vaporisation = l = 2260 kJ/kg
The latent heat of fusion is the amount of energy required to change one kg of ice into water without a change in temperature.
Firstly, we find the energy required to change the temperature of 40 g of ice from -10°C to 0°C.
[tex]Energy\:required=ms_{ice}\Delta T\\ \Delta T\:is\:the\:change\:in\:temperature\\Energy\:required=40\times2.108\times(0-(-10))=40\times2.108\times10=843.2J[/tex]
Then, the energy required to convert 40g of ice at 0°C to water at 0°C.
[tex]Energy\:required=mL=40\times336=13440J[/tex]
Then, the energy required to convert water at 0°C to water at 100°C.
[tex]Energy\:required=ms_{water}\Delta T=40\times4.187\times(100-0)=40\times4.187\times100=16748J[/tex]
The energy required to convert water at 100°C to steam at 100°C.
[tex]Energy\:required=ml=40\times2260=90400J\\[/tex]
The energy required to convert steam at 100°C to steam at 105°C.
[tex]Energy\:required=ms_{steam}\Delta T=40\times1.996\times(105-100)=399.2J[/tex]
Total Energy required = 843.2 + 13440 + 16748 + 90400 + 399.2 = 121560.4J = 121.56 kJ
Which of the following groups in the periodic
table contain elements so reactive that they are
never found in the free state?
(1) 1 and 2
(3) 2 and 15
(2) 1 and 11
(4) 11 and 15
Elements of Group 1 and group 2 in the periodic table contain elements so reactive that they are never found in the free state
Explanation:
The metals in group 1 of periodic table consisting of 'alkali metals' which include lithium, potassium, sodium, rubidium, Francium and caesium. They are highly reactive because they have low ionisation energy and larger radius. The group 2 metals consist of 'alkaline earth metals' which include calcium, strontium, barium, beryllium, radium and magnesium. These alkaline earth metal have +2 oxidation number, hence are highly reactive.
These both group metals are mostly reactive and so are never found in a free state. When they are exposed to air they would immediately react with oxygen. Hence, are stored in oils to avoid oxidation.
How many moles of I(iodine)2 are there in a 500.0g bottle? Please include significant figures
Answer:
Number of moles = 1.97 mol
Explanation:
Given data;
Number of moles of I₂ = ?
Mass = 500.0 g
Solution:
Number of moles = mass/ molar mass
Molar mass of I₂ = 253.8 g/mol
Number of moles = 500 g / 253.8 g/mol
Number of moles = 1.97 mol
A car tyre has a pressure of 2.6 atm at 10°C. If the pressure inside
reaches 5 atm, the tyre will fail. How hot would the tyre have to get for
this to happen?
Answer:
T = 271.23 degree celcius
Explanation:
For the gas inside the tyre
PV = nRT
So, P is directly proportional to T.
[tex]\frac{P_{1} }{P_{2} }[/tex] = [tex]\frac{T_{1} }{T_{2} }[/tex]
[tex]\frac{2.6}{5}[/tex] = [tex]\frac{283}{T}[/tex]
T = 544.23 K = 271.23 degree celcius
So, Tyre have to get the temperature 271.23 degree celcius for this to happen.
A radar gun records the speed of a projectile to be 120.090 m/s. How many significant digits are present in this measurement?
The measurement of 120.090 m/s recorded by the radar gun contains six significant digits, with all digits being significant.
In physics, understanding the concept of significant figures is essential for accurately reporting the measurements we make. The speed of a projectile recorded by a radar gun as 120.090 m/s contains six significant digits. This is because all non-zero numbers are always significant, any zeros between non-zero numbers are significant, and any trailing zeros to the right of the decimal point are also significant. Therefore, each digit in the measurement, 1, 2, 0, 0, 9 and 0, are all significant, giving us a total of six significant figures in the speed of the projectile.
The number of significant digits in a measurement is determined by the certainty of the measuring device.
In the given speed measurement of 120.090 m/s, there are five significant digits because each non-zero digit is significant, the trailing zero after the decimal point counts, and any zero between significant digits is also counted.
In this case, the significant digits are 120.090.
A patient's blood test shows that her hemoglobin concentration is 15.2 g/dL. How many milligrams of hemoglobin are in
every 3.50 mL of the patient's blood?
mass of hemoglobin =
mg
532 mg of hemoglobin
Explanation:
The concentration of hemoglobin in the blood is 15.2 g/dL. It we transform the g in mg and the dL in mL we have the value for the concentration to be 15200 mg / 100 mL.
Knowing the concentration we devise the following reasoning:
if there are 15200 mg of hemoglobin in 100 mL of blood
then there are X mg of hemoglobin in 3.5 mL of blood
X = (15200 × 3.5) / 100 = 532 mg of hemoglobin
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Taking into account the definition of mass per volume concentration and the change of units, 532 milligrams of hemoglobin are in every 3.50 mL of the patient's blood.
You know that the concentration of hemoglobin in the blood is 15.2 [tex]\frac{g}{dL}[/tex]. So, in first place, you need to change units: the g in mg and the dL in mL.
You know that 1 dL= 100 mL and 1 g= 1000 mg. Then:
[tex]\frac{15.2 g}{dL}=\frac{15.2*1000 mg}{100 mL} =152 \frac{mg}{mL}[/tex]
Then you can apply the following rule of three: if 1 mL contains 152 mg of hemoglobin, 3.5 mL contains how much mass of hemoglobin?
[tex]mass of hemoglobin =\frac{3.5 mLx 152 mg}{1 mL}[/tex]
mass of hemoglobin= 532 mg
Finally, 532 milligrams of hemoglobin are in every 3.50 mL of the patient's blood.
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Consider the redox reaction below.
Mg(s) + Fe2+ (aq) —>Mg2+ (aq) + Fe(s)
Which equation is a half reaction that describes the reduction that is taking place?
Fe2+ (aq) + 22 -> Fe(s)
Mg(s) — Mg2+ (aq) + 2e
Fe2+ (aq) –>Fe(s) + 2e-
Mg(s)+2e--> Mg2+ (aq)
Answer:
Fe2+ (aq) + 2e -> Fe(s)
Explanation:
Oxidation:
Oxidation involve the removal of electrons and oxidation state of atom of an element is increased.
Reduction:
Reduction involve the gain of electron and oxidation number is decreased.
Consider the following reaction:
Mg(s) + Fe2+ (aq) —>Mg2+ (aq) + Fe(s)
Magnesium loses its two valance electrons and oxidized while iron accept two electrons get reduced.
Magnesium is reducing agent while iron is oxidizing agent.
Oxidizing agents:
Oxidizing agents oxidize the other elements and itself gets reduced.
Reducing agents:
Reducing agents reduced the other element are it self gets oxidized.
A sample of glucose is found to have 34.92 g of carbon, 5.87 g of hydrogen and 46.56 g of oxygen. Another sample is found to have 0.4471 g of carbon, 0.07510 g of hydrogen, and 0.5962 g of oxygen. Show that these results are consistent with the law of definite proportions.
Answer:
See explanation below.
Explanation:
You just need to show that the ratio of all elements within the compound is always the same. The easiest way to do this is to divide everything by the lowest mass in each group:
[tex]34.92 C : 5.87H : 46.56O \rightarrow \frac{34.92}{5.87} C : \frac{5.87}{5.87}H : \frac{46.56}{5.87}O \rightarrow 6C : 1H : 8O\\\\0.4471 C : 0.0751H : 0.5962O \rightarrow \frac{0.4471}{0.0751} C : \frac{0.0751}{0.0751}H : \frac{0.5962}{0.0751}O \rightarrow 6C : 1H : 8O\\[/tex]
**Please keep in mind that this ratio is DIFFERENT from the stoichiometric ratio of the elements within the compound and does not tell you the empirical formula. The ratio just says there are 6g of C for every 1g of H and 8g of O. It does NOT mean the empirical formula is C6HO8.
A solution is prepared by adding 27.00 mL of 2.19 M MgCl2 to enough water to make 122.00 mL. What is the Cl- concentration of 40.00 mL of the dilute solution?
Need help with this chemistry question that I'm unsure about with explanation please and thank you
DO NOT include units or chemical symbols in your answer
To find the Cl- concentration of the dilute solution, calculate the moles of MgCl2 in the original solution, use stoichiometry to determine the moles of Cl-, and divide by the volume to find its concentration.
Explanation:To determine the concentration of Cl- in the dilute solution, we can use the concept of mole ratios. First, we calculate the number of moles of MgCl2 in the original solution by multiplying the volume of the solution by its concentration. Then, we use the stoichiometry of the equation to determine the number of moles of Cl-. Finally, we divide the number of moles of Cl- by the volume of the dilute solution to find its concentration.
Moles of MgCl2 = volume of solution (L) x concentration of MgCl2 (mol/L)
Moles of Cl- = Moles of MgCl2 x 2 (from the balanced equation)
Concentration of Cl- = Moles of Cl- / volume of dilute solution (L)
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