The average atomic mass of the element is 25.75 amu.
m(²⁵X) = 25.0 amu; the average atomic mass of isotope-25
m(²⁸X) = 28.0 amu; the average atomic mass of isotope-28
ω(²⁵X) = 75.0% ÷ 100%
ω(²⁵X) = 0.750; fractional abudance of isotope-25
ω(²⁸X) = 25.0% ÷ 100%
ω(²⁸X) = 0.250; fractional abudance of isotope-28
m(X) = m(²⁵X) × ω(²⁵X) + m(²⁸X) × ω(²⁸X).
m(X) = 25.0 amu × 0.750 + 28.0 amu × 0.250
m(X) = 25.75 amu; average atomic mass of an element
The unified atomic mass unit (amu) is a standard unit of atom.
Isotopes are chemical elements with same atomic number, but different atomic mass (different number of neutrons).
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be sure to answer all parts. draw bond-line structural formulas (not lewis structures) for all the constitutional isomers that have the given molecular formula. c3h7cl window open cl at c-1 draw structure ... cl at c-2
The compound C3H7Cl chloropropane has two constitutional isomers: 1-chloropropane and 2- chloropropane as shown in the picture.
Isomerism is the phenomenon in which distinct compounds with the same chemical formula exist side by side.Isomerism can be divided into two main subcategories, each of which has a different definition. Stereoisomerism and structural isomerism are the two main forms.In C3H7Cl we can only observe only 2 isomers. formula will be the same but the positioning of chlorine will change. More than 2 isomers cannot be obtained because propane only has 3 carbon atom. naming will start from the position of carbon atom on which chlorine is attached, therefore 3-chloropropane does not exist.so we can observe only two isomers of C3H7Cl by position chlorine on C-1 and C-2 atom.
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A student is performing an experiment that requires measuring the boiling point of water. The accepted value for the boiling point of pure water is 100.0ºC. In the experiment, the student measured the boiling point to be 99.2ºC. What is the percent error in the student’s experiment?
percentage error in the student’s experiment is 0.8%
To find percentage error we use the formula I E -T I / I T I X100
so by the given data experimental value is 99.2ºC and actual theoretical value is 100.0ºC by putting the values we get 0.8% error.
To determine how closely the measured number resembles the real value, the percentage error is calculated. It is a component of a thorough error analysis. In most domains, % error is always reported as a positive figure, although in some, either a positive or negative value is acceptable.
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Answer: B
Explanation: :)
which would least strongly attract electrons from other atoms in a compound? elements of group 1 elements of group 2
Elements from group 1 have the least chances to attract electrons due to their low electronegativity.
The atom's tendency to attract electrons in a molecule is known as electronegativity. The trend of electronegativity on the periodic table is as follows:
electronegativity increases across a period and decreases down a group.This means that the least electronegative element is from group 1 elements, specifically Cesium and Francium which have electronegativity of 0.79 and 0.70, respectively. In general, group 2 elements have higher electronegativity compared to group 1 elements. The three elements with the highest electronegativity are nitrogen, oxygen, and fluorine which have 3.04, 3.44, and 3.98, respectively.
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give 2 examples of group 1 element
3. What would the following two activities lead to: *
a. Planting more trees
b. Prohibiting fishing during breeding season
O Decreased Biodiversity
Biodiversity will remain unaffected
O Biodiversity will increase
5 MINS TILL DUE
The following activities of planting more trees and prohibiting fishing during the breeding season will lead to maintain biodiversity, which means the biodiversity will remain unaffected.
Biodiversity describes the huge variety of life on Earth. It can be used to refer to all of the species in one region or ecosystem. Biodiversity refers to every living thing, including plants, bacteria, animals, and humans. It is the variation among the living organisms.
A large number of plant species results in greater variety of crops. It results in the natural sustainability for all the life forms. Reforestation or planting more trees helps in the increase of the primary production, reduce the susceptibility and results in the increase of ecological resistance, like climate changes, etc.
Aquaculture can greatly impact the biodiversity. It is important to manage it to maintain it. Prohibiting fish farming or fishing during breeding season will help maintain the biodiversity there is no decline in fish species. Overfishing also affects the genetic diversity.
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What is the purpose of having the Periodic Table?
Answer:
Explanation:
Scientists use the periodic table to quickly refer to information about an element, like atomic mass and chemical symbol. The periodic table's arrangement also allows scientists to discern trends in element properties, including electronegativity, ionization energy, and atomic radius.
Answer:
Scientists use the periodic table to quickly refer to information about an element, like atomic mass and chemical symbol. The periodic table's arrangement also allows scientists to discern trends in element properties, including electronegativity, ionization energy, and atomic radius.
Explanation:
Most hydrogen (H, #1) atoms have a mass of 1. How many neutrons would there be in one of these hydrogen atoms? (1 pt)
*
1 point
0
1
2
4
0
Explanation:All atoms are made up of particles known as protons, neutrons, and electrons.
Mass Number
The mass number of an atom is most commonly given in amus. Amu stands for atomic mass unit. In an atom, a proton = 1 amu, a neutron = 1 amu, and an electron = 0 amu. Since atoms are so small, it is hard to measure a singular in normal units such as grams. So, instead, scientists use amus. Comparatively, protons and neutrons are far larger than electrons. This is why electrons are given a mass of 0 amu. Of course, electrons do technically have mass, but that mass is so small that it is negligible in many calculations.
Counting Neutrons
When given the atomic number and mass number, it is easy to find the number of neutrons. The atomic number of an element tells you how many protons there are. The mass number gives you the mass of the atom in amus; this number is equal to protons + neutrons. This means that mass number - atomic number = neutron number.
So, we can set up a very simple equation to find the number of neutrons.
1 - 1 = 0 neutrons.Most hydrogen atoms have no neutrons.
Use the periodic table above to determine which of the following elements has 4 valence electrons as a neutral atom. (1 pt)
*
1 point
Magnesium (Mg, #12)
Lithium (Li, #3)
Silicon (Si, #14)
Sulfur (S, #16)
the chemical bonds that form when atoms that have lost electrons are electrically attracted to atoms that have gained electrons are called
What is the independent variable?
what is the dependent variable?
what are the constants?
what equipment and materials will you use? (please include amounts and use SI units if possible)
what data and observations will you record?
what safety precautions will you take?
what is the general procedure you will follow for your experiment? (this can be in a paragraph or numbered list form)
Answer:
independent variable is what you change in a science experiment, dependent variable is what's being measured in a science experiment. any characteristics, number, or quantity that can be measured or counted. A variable may also be called a data item.
A constant is a quantity that does not change. Although you can measure a constant, you either cannot alter it during an experiment or else you choose not to change it. Contrast this with an experimental variable, which is the part of an experiment that is affected by the experiment.
for materials and equipment, can be a ruler, and a data chart to put information, and a timer if needed,
you will record the amount of baking powder you have, and make observations of making sure you have the right amount of baking powder.
also make sure your experiment is safe.
I guess you can use a data chart to keep track of your information, and you can make a hypothesis, conlusion, BUT NO OPINION, make sure to know that before starting a experiment
The smallest unit of an element that has the chemical properties of the element is the.
Answer: An atom
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What does it mean to use an empirical approach when attempting to answer a question?
Using an empirical approach when attempting to answer mean your answer should be based on data that is backed by experiments and evidence.
It is an experiment-based approach based on real-world data and results. The empirical approach-based answer should not be made up of theories and concepts. Your calculations and results should be based on experiences in the real world. Empirical research can be Quantitative research (information based on numerical data) or Qualitative (non-numerical).
On the other hand, non-empirical or theoretical answers are based on theories and concepts that have not been experimented as of now.
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a volume of saline solution had a mass of 25.6 g at 4 °c. an equal volume of water at the same temperature had a mass of 24.5 g. what is the density of the saline solution? quizlet
The saline solution has a density of 1.045 g/mL.
StepsPure water has a density of 1.000 g/mL.
The saline solution has larger mass, but the volumes are equal.
d = 1.000 g/ml ×25.6g / 24.5g
d = 1.045 g/mL.
The saline solution has a density of 1.045 g/mL.
What is the purpose of saline solution?They support patients through surgery, dialysis, and chemotherapy, cure dehydration, flush wounds, and provide diluted medication. 9 grams of salt per litre of water is what makes up saline solution, or a 0.9% solution of sodium chloride.Is saline solution just water and salt?Salt and water are combined to make saline. Because of its salt content (0.9% saline), which is comparable to that of tears, blood, and other bodily fluids, a normal saline solution is known as normal. Isotonic solution is another name for it.Why don't you use water instead of saline solution?Because it is a nontoxic, isotonic solution that does not impair healing, normal sterile saline is recognised as the most suitable and preferred cleansing solution.
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During a solvent extraction, a student lost track of which layer was the aqueous layer and which was the organic layer. What simple, non‑destructive test could be used to determine which layer is which?.
Non‑destructive test could be used to determine which layer is which is:
a. add a little distilled water to see which layer the water adds to.
Aqueous layer will be dissolved in water, while the organic layer not.
Water is polar substance as the аqueous layer, while organic layer is nonpolar substance.
Water is a “universal" solvent.
The ability of water to function as a versatile solvent arise from the structure of water molecules.
Other test methods are destructive.
A supercritical extraction is used to separate substances using a supercritical fluid as a solvent. The pressure and temperature of the supercritical fluid are higher than the critical point.
A separatory funnel is used to separate liquids.
In IR spectroscopy, substances have the interaction with infrared radiation.
Missing options:
a. add a little distilled water to see which layer the water adds to
b. obtain a sample of the solution in the seperatory funnel and utilize IR
c. ask the instructor if you can perform a supercritical extraction of the sample
d. obtain a sample of solution in seperatory funnel and utilize NMR
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the burning of fossil fuels for energy in the modern era of life on earth is resulting in a significant increase in total co2 concentration in earth’s atmosphere. however, the ratio of 14c to 12c is decreasing. why is this? the 14c in fossil fuels is not effectively converted to 14co2 in combustion. it is difficult to detect the 14c when total co2 levels are so high. all 14c in the fossil fuels is removed during the industrial refining processes. fossil fuels are so old that any 14c in the starting organic matter has decayed.
The fossil fuel which normally contains contains high carbon sources. When it burnt it'll produce a lot of carbon dioxide increasing in its concentration in the atmosphere. But the ratio of 14C to 12C is decreasing because the age of those fossil fuel are so high that the carbon's content is ruined.
What is Fossil Fuels? Fossil fuels are the fabric that contains hydrocarbons that are generated from the dead remains and decay of plants and animals that are buried underground for many years.They are extracted and burned by humans by the tatic of energy for various uses.Uses of Fossil Fuels? natural gascoalpetroleumThese are Extracted by Humans through the method of Drilling and Mining.
Petroleum:It is also called oil and is most often used as the discussed from of fossil fuel in the world today. Crude Oil is also the form of Petroleum.Petroleum is consist carbon and hydrogen which has gone through an organic phase in the plant having single cell and animals.Petroleum is known by its predominant hydrocarbon.Natural Gas: It is made up of Methane and is very light in weight.Natural Gas is found Deep down the Earth's Surface.colour, odour, and flammability are three main properties of Natural Gas. Coal:coal may be a type of Solid which is Black in colour.Coal are often recovered by under ground Mining.oxygen, carbon, nitrogen, hydrogen, and sulphur, are the five major element of Coal.
Thus from the above conclusion we can say that, ratio of 14C to 12C is decreasing because the age of these fossil fuel are so high that the carbon's content is ruined.
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Carlos likes to bowl. He timed how long it took for his ball to travel the length of an 18-m lane in the bowling alley. He plotted the final distance and time on a line graph. Carlos drew a line from this point to the origin of the graph.
Carlos likes to bowl. He timed how long it took his ball to travel the length of the bowling alley's 18-meter lane. The ball will travel 12 m far after it had travelled for 2 s.
What is length?Length can be defined as a term used for identifying the size of an object and distance travelled by the object from one point to another point.
The S.I. unit of length is meter.
It can also be defined as the amount of time that something can last.
Thus, Carlos likes to bowl. He timed how long it took for his ball to travel the length of an 18-m lane in the bowling alley. The ball will travel 12 m far after it had travelled for 2 s.
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Your question is incomplete but most probably your full question was
Carlos likes to bowl. He timed how long it took for his ball to travel the length of a an 18-m lane in the bowling alley. He plotted the final distance and time on a line graph. Carlos drew a line from this point to the origin of the graph.
How far down the lane was the ball after it had traveled for 2 s?
6 m
9 m
12 m
18 m
Describe Lithium, Beryllium, Calcium, Aluminium, Argons' position in the periodic table.
Answer:
Explanation:
lithium (Li), chemical element of Group 1 (Ia) in the periodic table, the alkali metal group, lightest of the solid elements. The metal itself—which is soft, white, and lustrous—and several of its alloys and compounds are produced on an industrial scale.
Boiling point: 1,342 °C (2,448 °F)
Oxidation state: +1
Electron configuration: 2-1 or 1s22s1
Beryllium is an element with an atomic number of 4 in the periodic table. It is a bivalent and highly toxic element. The element has one of the highest melting points among the light metals. Beryllium exists in 30 different minerals, among which bertrandite, beryl, chrysoberyl, and phenacite are the most important.
The chemical element Calcium (Ca), atomic number 20, is the fifth element and the third most abundant metal in the earth's crust.
Atomic number: 20
Atomic mass: 40.08 g.mol -1
Standard potential: - 2.87 V
Electronic configuration: 4s2
Where Is Aluminum Found On The Periodic Table? Aluminum is the 13th element on the periodic table. It is located in period 3 and group 13.
Argon is a chemical element with the symbol Ar and atomic number 18. It is in group 18 of the periodic table and is a noble gas. Argon is the third-most abundant gas in the Earth's atmosphere, at 0.934% (9340 ppmv).
Appearance: colorless gas exhibiting a lilac
Group: group 18 (noble gases)
Phase at STP: gas
Speed of sound: 323 m/s (gas, at 27 °C)
anything that can change in an experiment is called
Answer:
variables because they can change or be changed
Which of the following is not a unit of volume?
Answer:
Cm2 Is not a unit of volume.
Explanation:
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An element that is malleable is ____. Needed ASAP;
A. Very hard
B. Very dense
C. Difficult to pour
D. Easily moulded and shaped
Which 2 organelles work together to make proteins in the cell?
A, B or C
OH FiverT22 I NEED YOUR HELP OR ANYONE WHO CAN
Which of the following materials contains a base?
Select one:
a. Stomach digestive juices
b. Orange juice
c. Ammonia window cleaner
d. Vinegar
Ammonia window cleaner materials contains a base
Window cleaner contains ammonia which is basic and used for removing dust and grease on the windows, and also for hard water stain on window. ammonia is generally basic in nature according to the Arrhenius theory as well as Lewis acid base theory but it behave as acid only in the presence of strong acid that can extract a proton out of it. in window cleaner ammonium hydroxide is used as a window clear and because of hydroxide it is base because hydroxide is basic in nature and ammonia is alkaline in nature that's why ammonia window cleaner materials contains a base.
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a chemist determines by measurements that moles of iodine solid participate in a chemical reaction. calculate the mass of iodine solid that participates. round your answer to significant digits
Answer: The answer is 5.076 g of iodine solid.
Explanation:
What causes tectonic plates to move?
What is a convergent boundary?
What is a divergent boundary?
What is a transform boundary?
What is a transform boundary?
What is the energy if the frequency is 8.33 x 10^-4 Hz
a voltaic cell is based on the reduction of ag (aq) to ag(s) and the oxidation of sn(s) to sn2 (aq).
Half-reaction for the cell's anode is given below:
Anode : [tex]\\Sn(s) \rightarrow Sn^{2+} (aq) +2e^{-}[/tex]
The anode is defined as the electrode at which electrons leave the cell and oxidation occurs, and the cathode as the electrode at which electrons enter the cell and reduction occurs. The anode is usually the positive side.
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Your given question is quite incomplete here is complete question.
A voltaic cell is based on the reduction of _ Agt(aq) to Ag(s) and the oxidation of Sn(s) to Sn2+(aql) : Part 1 Include the phases of all species in the chemical equation: (aqh Anode: Sn(s) Sn?+ (aq)
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brainly which change is chemical?(1 point) water freezing: liquid water becoming solid water water freezing: liquid water becoming solid water water boiling: solid water becoming gaseous water water boiling: solid water becoming gaseous water water evaporating: liquid water becoming gaseous water water evaporating: liquid water becoming gaseous water water undergoing electrolysis: liquid water becoming oxygen and hydrogen molecules water undergoing electrolysis: liquid water becoming oxygen and hydrogen molecules
An example of a chemical change is water undergoing electrolysis: liquid water becoming oxygen and hydrogen molecules.
In chemistry, changes are classified into two: physical and chemical.
A physical change occurs when a substance or object changes its appearance, phase, or is used in a mixture. More importantly, a physical change does not change the molecular structure of a substance. These three are examples of physical changes in water, wherein the changes are on their phases only:
water freezing: liquid water becoming solid water
water boiling: solid water becoming gaseous water
water evaporating: liquid water becoming gaseous water
On the other hand, a chemical change takes place when the original substance's of molecules are taken apart and put back together into new combinations that are different from the original combinations. An example of this is water undergoing electrolysis: liquid water becoming oxygen and hydrogen molecules, wherein a compound of water molecule is being break down into different molecules.
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Based on the amino acid sequences of each histone, estimate the charge of a histone octamer at ph 7. Assume that histidine residues are uncharged at this ph.
The histone octamer has a total charge of +146 at pH 7 if histidine residues are assumed to be uncharged.
There are 9 negatively charged (Asp + Glu) and 26 positively charged (Arg + Lys) residues in total on histone H2B.
The net charge on H2A is 26 - 9 = +17.
There are 10 negatively charged (Asp + Glu) and 28 positively charged (Arg + Lys) residues in total on histone H2B.
The net charge on H2B is 28 - 10 = +18.
There are 11 negatively charged (Asp + Glu) and 31 positively charged (Arg + Lys) residues in total on histone H3.
The net charge on H3 is 31 - 11 = +20.
There are 7 negatively charged (Asp + Glu) and 25 positively charged (Arg + Lys) residues in total on histone H4.
The net charge on H4 is 25 - 7 = +18.
2 x (17 + 18 + 20 + 18) = +146 is the total charge of the histone octamer.
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Calculate the heat change in kilojoules for vaporization of 6.00 kg of water at 100 ∘C .
The heat change for vaporization of 6.00 kg of water at 100°C is 13490.584 kJ.
The heat or enthalpy for vaporization is the amount of heat energy which is required to bring change in the state of a substance, such as from a liquid into a vapor or gas. It is also known as enthalpy of vaporization. The unit of enthalpy for vaporization is given in joules (J) or calories (cal).
Given data :
mass of water = 6.00 kg
Hvap = 40.7 kJ/mol
To calculate the amount of heat -
we know,
the heat required for 1 mol of water to vaporize at 100°C is 40.7 kg
and
we know molar weight of water is 18.015 gram
So,
moles of 6.00 kg water is = 2600
18.1015
mole of water = 331.464 mol
Hence,
Heat change for vaporization is = 331.464 × 40.7
= 13490.584 kJ
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hydrochloric acid + chromium hydrogencarbonate =
how do I complete this word equation and then convert it to a BALANCED word equation
Answer:
3HCl + Cr (HCO3)3 --> CrCl3 + 3CO2 + 3H2O