Determine the number of protons, neutrons, and electrons in the following isotopes
that are used in medical diagnoses:
a. atomic number 9, mass number 18, charge of 1-
b. atomic number 43, mass number 99, charge of 7+
C. atomic number 53, atomic mass number 131, charge of 1-
d. atomic number 81, atomic mass number 201, charge of 1+
e. Name the elements in parts (a), (b), (c), and (d).
Answer: In table below.
Explanation:
A.N. (atomic number) = protons
Mass (Total AMU)
Charge
P= Protons, same as atomic number
N = Neutrons, Atomic Mass Number - Protons
E = Electrons. (Atomic Number - Charge)
Element = Defined by atomic number
a) Atomic number=9 Protons = 9, neutrons = 9, electrons = 10
b) Atomic number=43, Protons = 43, neutrons = 56, electrons = 36
c) Atomic number=53, Protons = 53, neutrons = 78, electrons = 52
d) Atomic number=81, Protons = 81, neutrons = 120, electrons = 80
e) Name the elements in parts (a), (b), (c), and (d) are F, Tc, I and Tl.
What is the atomic number?Atomic Number (Z)= number of protons = number of electrons
Mass number (A) = number of protons + number of neutrons.
For ions with a positive net charge:
Number of electrons = Z - net charge
For ions with negative net charge:
Number of electrons = Z + net charge
a) Atomic number=9 Protons = 9, neutrons = 9, electrons = 10
b) Atomic number=43, Protons = 43, neutrons = 56, electrons = 36
c) Atomic number=53, Protons = 53, neutrons = 78, electrons = 52
d) Atomic number=81, Protons = 81, neutrons = 120, electrons = 80
e) Name the elements in parts (a), (b), (c), and (d) are F, Tc, I and Tl.
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Which of the following best describes an electron orbital? (electron orbital)
a) A circular path in which an electron "orbits” around a nucleus.
b) A location around the nucleus in a sphere where the electron is likely to be located.
c) An elliptical path around the nucleus.
d) The nucleus
Answer:
D
Explanation:
If a recycling center collects 3245 aluminum cans and there are 22 aluminum cans in 1 lb what volume in liters
The volume in liters of 3245 aluminum cans is 24.8 L.
A recycling center collects 3245 aluminum cans and there are 22 aluminum cans in 1 lb. The mass of 3245 aluminum cans is:
[tex]3245 cans \times \frac{1lb}{22cans} = 147.5 lb[/tex]
To convert mass to volume, we need the density of aluminum (5.95 lb/L). The volume corresponding to 147.5 lb of aluminum is:
[tex]147.5 lb \times \frac{1L}{5.95 lb} = 24.8 L[/tex]
The volume in liters of 3245 aluminum cans is 24.8 L.
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give the name and symbol of your favorite element and explain why it your favorite element.
Answer:
The most important elements that we use in everyday life include carbon, hydrogen, oxygen, with smaller amounts of things like chlorine, sulfur, calcium, iron, phosphorus,nitrogen, sodium, and potassium. Apart from these, other elements include magnesium, zinc, neon, and helium are also in our daily existence.
all these element are my favourite element .......
A galvanic cell is constructed of one half cell in which a silver wire is placed into a 1.00 Maqueous solution of silver nitrate and the other half cell is made of a zinc wire in a 1.00 M aqueous solution of zinc nitrate. calculate gibbs free energy
Answer:
https://www.plps-k12.org/site/handlers/filedownload.ashx?moduleinstanceid=2482&dataid=3257&FileName=Ch%2017%20Electrochemistry%20Practice%20Problems%20I%20-%20key.pdf
Explanation: This is all the answers just go to this link to help is a bunch of pages to help and with answers on them too! Can I get brianliest plz
If the density of carbon tetrachloride is 0.893 g/mL, and a sample has a volume of 9.29 mL, what is the mass?
Answer:
8.3g
Explanation:
d=m/v
m=d*v
m=0.893*9.29
m=8.3g
If the density of carbon tetrachloride is 0.893 g/mL. The mass of the compound will be 8.3 g.
What is mass?Mass is the quantity of matter. The mass can be calculated by multiplying density with the volume. The evaluation of how close something is packed. As the mass per unit volume, it has that definition.
Volume is the space occupied by the object. The liquid that weighs heavier is denser if you weigh two liquids with similar volumes or amounts. A substance that is less dense than water will float if it is gently introduced to the water's surface.
So the formula will be d = m / v
m = d x v
The density of carbon tetrachloride is 0.893 g/m
The volume of carbon tetrachloride is 9.29 mL
What the mass is?
Putting the value in the formula
m = 0.893 x 9.29 = 8.3g
Thus, the mass of the compound will be 8.3 g.
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Why are intensive properties useful for identifying a substance?
A.They do not depend on the amount of substance you have.
B.They are chemical properties.
C.They are physical properties.
D.They describe the amount of substance you have.
The intensive properties are useful for identifying a substance because it does not depend upon the amount of substance present in the sample.
The points regarding properties are the following:
The intensive properties are defined as the properties which do not depend on the amount of the substance present in the matter but depend only on the type of the matter.The colour, solubility, texture, etc. are the intensive properties. •The properties which depend upon the amount of the substance present in the sample is called the extensive properties.The mass, density etc. are the extensive properties.Therefore, the correct answer is the A. They do not depend on the amount of substance you have.
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Chloric acid (HCIO3 is a neutral compound. The chlorine atom has what oxidation number?
Answer: 1
Explanation: one
Chloric acid is a neutral compound and an oxoacid with strong oxidizing power. In the compound (chloric acid), chlorine has an oxidation number of +5. Thus, option c is correct.
What is the oxidation number?The oxidation number is defined as electrons that are transferred by accepting and donating in a chemical bond formation. They denote the atoms that have gained and donated electrons by the positive and negative states.
As chloric acid is a neutral compound, the equivalent will be zero. The oxidation state of the hydrogen atom is generally taken as 1 and that of oxygen as -2 as it requires two more electrons in its valence shell.
The oxidation number will be estimated as,
HCIO₃ = 0
+1 + x + 3(-2) = 0
+1 + x - 6 = 0
x = + 6 - 1
x = + 5
Therefore, option c. chlorine has a +5 oxidation number in chloric acid.
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In the laboratory you dissolve 19.4 g of sodium chloride in a volumetric flask
and add water to a total volume of 375 mL.
What is the molarity of the solution? In M. What is the concentration of the sodium cation? In M. What is the concentration of the chloride anion? In M.
Answer: 0.885 M
Explanation: 19.4 grams of NaCl is (19.4g/58.55 g/mole) = 0.332 moles of NaCl. 375ml is 0.375 liters. Molar is moles per liter: (0.332 moles NaCl/0.375 liters) = 0.885 M
What's the major difference between carbon and other group IV elements, excluding allotropy
Answer:
Carbon has an ability of catenation which other group IV elements lack.
Explanation:
Catenation is the ability for an element to form multiple bonds with other elements leading rise to long chains of compounds.
An example is organic compounds.
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Would overheating be a stimulus or a
response?
Stimulus
Response
Answer:
stimulus response
Explanation:
its stimulus response
what is electron configuration. dont use googlrl plz
Answer:
Electron configuration is the structural arrangement notation of electrons in the shells or energy levels of an atom.
Explanation:
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How do scientists take instruments for measurement up to about 100,000 feet of
elevation?
A.jet aircraft
B.rockets
C.satellites
D.weather balloons
Answer:B
Explanation: i got it right
The scientists use weather balloons to measure up to about 100,000 feet of elevation. The correct option is D.
What is weather balloon?A weather balloon, also known as a sounding balloon, is a balloon that carries instruments aloft to transmit data on atmospheric pressure, temperature, humidity, and wind speed using a small, disposable measuring device known as a radiosonde.
Weather balloons can travel up to 24 miles (39 kilometres) before bursting, and a payload can land (via parachute) up to 75 miles (120 kilometres) away, depending on wind conditions at the launch site.
If the balloon is flexible, it will expand as it rises to lower air pressure altitudes.
To prevent them from popping, weather balloons are only partially filled when released.
Thus, the correct option is D.
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Determine the molecular and empirical formulas of the following:
a. the organic solvent benzene, which has six carbon atoms and six hydrogen atoms.
b. the compound silicon tetrachloride, which has a silicon atom and four chlorine atoms and is used in the manufacture of computer chips.
c. the reactive substance diborane, which has two boron atoms and six hydrogen atoms
d. the sugar called glucose, which has six carbon atoms, twelve hydrogen atoms, and six oxygen atoms.
Answer:
the answer is b im pretty sure
Explanation:
sorry if im wrong
The empirical formula for benzene is CH. The molecular formula for benzene is C[tex]_6[/tex]H[tex]_6[/tex]. The empirical formula is also known as the simplest basic formula.
What is molecular formula ?A molecular formula is indeed a formula derived with molecules that corresponds to the total number of distinct atoms in the molecule of a chemical. A subscript inside a molecular formula denotes the number for each type of atoms in the substance's molecule.
The empirical formula provides the most basic formula for something like a compound, defined by the ratio between subscripts of the formula's smallest entire number of constituents. It is also known as the simplest basic formula. An empirical formula is the formula of a material given with the least integer subscript. The empirical formula for benzene is CH. The molecular formula for benzene is C[tex]_6[/tex]H[tex]_6[/tex].
Therefore, the molecular formula for benzene is C[tex]_6[/tex]H[tex]_6[/tex].
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Mrs. Marlow's class is conducting an investigation of a mixture of sand, iron filings, and salt. They were told that they must separate the mixture into pure sand, pure iron filings, and pure salt using only the physical properties of each component using the following supplies:
bar magnet
filter paper
plastic funnel
water
What is the BEST procedure for the students to follow in order to separate the mixture?
A mixture can be separated by looking at the physical properties of the components of the mixture.
Since salt is soluble in water, water can be added to the mixture to dissolve the salt.
The bar magnet is now introduced in order to remove the iron filings since they are attracted by a magnet.
The solution is filtered to separate the sand from the salt solution.
Lastly, the salt solution is heated to dryness to drive away the water and obtain the solid salt.
Hence the mixture has been separated into its components using their individual physical properties. Option A is the correct answer.
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Answer:
is it a b c or d
Explanation:
Which area of science is considered the central science?
chemistry
biology
physics
environmental science
Answer:
A. Chemistry.
Explanation:
What is best illustrated by wattson and crick's ball-and-stick model of DNA
What is the rate law?
Answer: B
Explanation:
The rate law is the mathematical equation that describes how reactant concentration changes as a function of time. A law such as "Rate = k*[A]*[B]" means that, for each liter-equivalent of the reactant(s) A, there are k liters of reactant B. The law also dictates the molarity (and thus partial pressure) for each component in solution.
10 cm3 of metallic cylinder has a mass of 39.35 g. The density of this cylinder is
Group of answer choices
3.935 g/cm3
39.35 g/cm3
10 g/cm3
5.935 g/cm3
Answer:3.935g/cm3
Explanation:39.35 g. /10cm3 = 3.935g/cm3
10 cm³ of metallic cylinder has a mass of 39.35 g. The density of this cylinder is 3.935 g/cm³.
Density is a measure of the amount of mass per unit volume of a substance. It is an intensive physical property, meaning that its value does not change depending on the size of the object.
Density is calculated by dividing an object’s mass by its volume.
The density of water is 1,000 kg/m³ at 4°C. The unit of density is kg/m³ (kilogram per cubic meter). The SI unit of density is kg/m³
Density = mass/volume
= 39.35 g/10 cm³
=3.935 g/cm³.
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Pioneer 10 is a 267.1-kilogram robotic space probe that completed the first interplanetary mission
to Jupiter, and became the first spacecraft to achieve escape velocity from our solar system. How
much does it weight in pounds (lbs)?
Answer: 588.9 lbs
Explanation: 1 lb = 0.454 kg
(267.1kg)*(1 lb/0.454 kg) = 588.9 lbs
How many molecules are present in 2 H₂ SO4
Answer:
1 mol of H2SO4 contains 6.022 x 10^23 molecules. : 0.5 mol of H2SO4 contains 0.5 x 6.022 x 10^23 molecules. = 3.011 x 10^23 molecules . that is 49 g of H2SO4 contains 3.011 x 10^23 molecules of H2SO
Explanation:
Please help me please
Answer:
Hope this helps.
Explanation:
See the picture. Hope it helps. Sorry if i was incorrect.
Which of these can be mined from earth and used as an energy source?
A.Get rid of the waste and extra fluid
B.Ureters
C.Coal
D.Bladder
coal
Which of these can be mined from earth and used as an energy source?
A.Get rid of the waste and extra fluid
B.Ureters
C.Coal
D.Bladder
ans is coal
What mass of oxygen is needed to complete the combustion of 8.80 x 10^-3 g of methane?
Explanation:
The chemical reaction that describes the combustion of methane is
[tex]\text{CH}_4 + 2\text{O}_2 \rightarrow \text{CO}_2 + 2\text{H}_2\text{O}[/tex]
We need to convert the mass of methane to moles:
[tex]0.00880\:\text{g} × \dfrac{1\:\text{mol CH}_4}{16.04\:\text{g}}[/tex]
[tex]= 5.49×10^{-4}\:\text{mol CH}_4[/tex]
Now use the molar ratios to determine the amount of oxygen used during the combustion:
[tex]5.49×10^{-4}\:\text{mol CH}_4×\left(\dfrac{2\:\text{mol O}_2}{1\:\text{mol CH}_4}\right)[/tex]
[tex] = 0.00110\:\text{mol O}_2[/tex]
Converting this to grams, we find that the mass of oxygen is
[tex]0.00110\:\text{mol O}_2×\left(\dfrac{15.999\:\text{g O}_2}{1\:\text{mol O}_2}\right)[/tex]
[tex] = 0.0176\:\text{g O}_2[/tex]
In which way are the scientific method and the design process the same?
Answer: A lot of the steps are the same.
Explanation:
Scientific Method
State your question
Do background research
Formulate your hypothesis, identify variables
Design experiment, establish procedure
Test your hypothesis by doing an experiment
Analyze your results and draw conclusions
Communicate results
Steps of The Scientific Method
Engineering Design Process
Define the problem
Do background research
Specify requirements
Create alternative solutions, choose the best one and develop it
Build a prototype
Test and redesign as necessary
Communicate results
Steps of The Engineering Design Process
Salicyllic acid has what ionic charge?
Answer:
0
Explanation:
It has no charge.
Salicylic acid is insoluble in water because it is a non-polar covalent compound.
For this reason it is a poor conductor of electricity as it has no free moving ions that would act as charge carriers.
But on the other hand salicylate which is a conjugate base of salicylic acid has a charge of -1 and can be written as C7H5O3-.
hopefully this makes sense
:)
PLEASE, QUICKLY!!!!!!!!!
Which statement correctly describes the relationship between the volume of a gas and its temperature, in Kelvin, assuming pressure is held constant?
A. The relationship is directly proportional; as temperature increases, volume decreases in the same way.
B. The relationship in inversely proportional; as temperature increases, volume increases in the same way.
C. The relationship is inversely proportional; as temperature increases, volume decreases in the same way.
D. The relationship is directly proportional; as temperature increases, volume increases in the same way.
The statement that correctly describes the relationship between the volume of a gas and its temperature, in Kelvin, assuming pressure is held constant is "he relationship is directly proportional; as temperature increases, volume increases in the same way."
In mathematics, a direct proportion means that the two variables increase or decrease simultaneously. As one increases the other increases and vice versa.
According to Charles law; the volume of a given mass of gas is directly proportional to its volume at constant pressure.
As a result of this law, the correct statement is option D; The relationship is directly proportional; as temperature increases, volume increases in the same way.
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The pungency of chillies is due to ____________.
Answer:
The hotness or pungency of chilli is due to presence of a group of compounds called capsaicinoids. Among capsaicinoids, capsaicin and dihydrocapsaicin are present in major quantities, while homocapsaicin, nordihydrocapsaicin and homo-dihydrocapsaicin are present in very small quantities.
The pungency of chillies is due to the presence of certain compounds called capsaicinoids.
How do I calculate the volume?
Answer:
2477.6 cm³
Explanation:
Volume = length x width x height
Label in cm³
why would methane attain a tetrahedral structure?
