BRAINLIEST! Please help me answer the following questions:
1) How do you find the valency of an element?
2) How do you determine if an element is nuetral/an isotope/ or an ion?
If you could help with 1 or both questions I would really appreciate it :)
Answers
Explanation:
1) from the periodic table for example if u looking for K it is from the group 1A so the valancey = +1 that is mean it loses one electron to reach a stable state. and this applied for the 1A , 2A, 3A groups.
if u looking for N it is from group 5A so its valency is -3
so it gain 3 electrons to reach a stable state to complete its orbital to 8 electrons. this applied to 5A, 6A,7A
for the transition metals and simimetals other rules.
2) neutral if the element does not hold any charge like
H2, O2, N2, Fe, Au, Cu ...
isotope : if the 2 elements have same symbol and atomic number but they differ in the mass number because the have different numbers of neutrons.
if the element is charged then it is considered as an ion ex: Fe2+ then it is iron cation ( +ion)
F- then it is fluoride anion (-ion)
if u have any doubt just writ a comment ( ;
Related Questions
How many atoms of each element are in one molecule of 2-heptanone
Answers
Answer:
A chemical structure of a molecule includes the arrangement of atoms and the chemical bonds that hold the atoms together. The 2-HEPTANONE molecule contains a total of 21 bond(s) There are 7 non-H bond(s), 1 multiple bond(s), 4 rotatable bond(s), 1 double bond(s) and 1 ketone(s) (aliphatic).
Answer:
Explanation:
CH3 provides 1 Carbon
C4 provides 4 carbons
COC provides 2 more
Total 7 Carbons
======================
COCH3 Provides 1 Oxygen
======================
CH3 provides 3 Hydrogens
C4H8 provides 8 hydrogens
COCH3 has 3 more hydrogens
Total 14 hydrogens
The answer should be B.
You should note that there are no brackets which means you only need to read the small numbers going down behind each element. You might have to read that sentence a could of times, but it is important to know.
How many moles of hydrogen sulfide will react with 1moles of silver
Answers
If we have 1 mole of silver, we would need 0.5 moles of hydrogen sulfide to completely react with the silver.
Hydrogen sulfide (H₂S) is a colorless, flammable gas that has a strong odor of rotten eggs. It is a naturally occurring gas that is produced by the decay of organic matter and can be found in crude petroleum and natural gas deposits, volcanic gases, and hot springs. Hydrogen sulfide is also produced by human and animal wastes and is a byproduct of some industrial processes.
Hydrogen sulfide is toxic and can be deadly in high concentrations. It can cause irritation of the eyes, nose, and throat at low concentrations, and at higher concentrations, it can cause unconsciousness, coma, and death.
In addition to its toxic properties, hydrogen sulfide is also flammable and can form explosive mixtures with air. Despite its dangers, hydrogen sulfide has some uses in industry, such as in the production of sulfuric acid and in the refining of petroleum.
Balanced chemical equation for the reaction of hydrogen sulfide (H₂S) and silver (Ag) is:
2Ag + H₂S → Ag₂S + H₂
From the equation, we can see that 2 moles of silver reacts with 1 mole of hydrogen sulfide. Therefore, if we have 1 mole of silver, we would need 0.5 moles of hydrogen sulfide to completely react with the silver.
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Which statement(s) about electrons is/are TRUE?
SELECT ALL THAT APPLY
a
When they were first discovered, they were named
"corpuscles."
b They have a negative charge.
с
They have a unique charge-to-mass ratio
depending on the element.
d They have a tiny but significant mass.
Answers
Answer:
All are correct
Explanation:
a. when Thomson discovered electrons he called them copuscles.
b. Millikan calculated chage on electron which is -1.6022 x \(10^{-19}\)C
c. Charge to mass ratio of electron is fixed that is 1.758820 x \(10^{11}\)C/kg
d. Although electons have mass (9.1 x \(10^{-31}\)kg) but is very small therefore it is not taken while calculating mass of atom.
Name a non-metal used to make electrode in the cell.
Answers
Answer:
graphite
Explanation:
graphite is also good conductor of electricity
If the length, width, and height of a box are 9.50 cm, 6.75 cm and 3.50 cm, respectively, what is the volume of the box in units of milliliters and liters?
(a) How many mL will the box contain?
(b) How many L will the box contain?
Answers
Answer: 1cm³= 1mL
Explanation:
points
Sodium and chlorine react together to form sodium chloride. Identify the reactant(s) and product(s?
Answers
Sodium and chlorine are the two reactants and sodium chloride is the product.
A very reactive metal called sodium interacts with chlorine gas to form sodium chloride, an inert salt. Chlorine gas is reduced to chloride anions whereas sodium is oxidized to sodium cation (Na+) (Cl-).One mole of sodium and two moles of chlorine gas combine to form two moles of sodium chloride.We are aware that chlorine is a very reactive non-metal and that sodium is a very active metal. Typically, non-metals like halogens tend to receive electrons while metals prefer to expel electrons.Chlorine accepts the electron to create the anion Cl-, and sodium rapidly loses its final shell electron to produce the cation Na+.Sodium, a solid reactant, interacts with greenish-yellow gaseous chlorine to form white crystalline sodium chloride.
Therefore, sodium and chlorine are reactants whereas sodium chloride is the product.
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When assembling a distillation apparatus, adding an extra condensing column filled with glass beads does which of the following? OA Lowers the boiling point B. Raises the boiling point C. Allows for better separations of liquids D. Increases the rate at which distillate is collect O E. None of the above
Answers
The correct answer is E. None of the above. Adding an extra condensing column filled with glass beads does not have any of the listed effects (A, B, C, D).
The purpose of a condensing column in a distillation apparatus is to cool the vapor produced during the distillation process and convert it back into a liquid form. This allows for the separation and collection of different components based on their boiling points.
Adding an extra condensing column filled with glass beads does not directly impact the boiling point of the substances being distilled (option A) or raise the boiling point (option B). The boiling point of a substance is determined by its intrinsic properties and is not affected by the addition of a condensing column.
While the addition of an extra condensing column may provide some benefits in terms of improving separation efficiency (option C), it is not a guaranteed outcome. The effectiveness of separation in a distillation process depends on various factors such as the composition of the mixture, temperature control, and the design of the apparatus as a whole.
Similarly, adding an extra condensing column does not inherently increase the rate at which distillate is collected (option D). The rate of distillate collection is influenced by factors such as heat input, reflux ratio, and the nature of the components being distilled.
In conclusion, adding an extra condensing column filled with glass beads does not have the listed effects (A, B, C, D), hence the correct answer is E. None of the above.
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A solution that has a pH of 5
Answers
Answer:
don't you have any options
A different student is given a 10.0g sample labeled CaBr2 that may contain an inert (nonreacting) impurity. Identify a quantity from the results of laboratory analysis that the student could use to determine whether the sample was pure.
Answers
Answer:
Mass of Ca in sample, Mass of Br in sample, Number of moles of Ca in sample, Number of moles of Br in sample, Mass or moles of element other than Ca or Br in sample
Explanation:
The AP Classroom will not count your answer to this question as correct unless it includes at least one of the answers listed above. If you say that theanswer to this question is density, it will be marked as incorrect, I found that out the hard way when I used the answers that brainly gave me.
Good luck,
I applaud you for using the sources avalible to you, which is /definetly not/ cheeting.
Which of the following require(s) resonance structures to more accurately represent their electron arrangements
Answers
The correct representation about resonance structures is that The structure of the species cannot be correctly predicted by a single resonance structure and the only way resonance structures vary is in the way the electrons are arranged.
In valence bond theory, resonance is defined as a hybrid structure formed by combining a variety of contributing structure into a resonance hybrid. Because orbitals overlap, resonance happens. Pi bonds, created when two 2p orbitals overlap, are the building blocks of double bonds. These pi orbitals' electrons are delocalized since they will be dispersed across more than two atoms.
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how many grams of potassium chloride can be dissolved in 200g of water at 80 c
Answers
Approximately 91.6 grams of potassium chloride can be dissolved in 200g of water at 80°C.
At 80°C, the solubility of potassium chloride in water is approximately 45.8 grams per 100 grams of water. Therefore, to find out how many grams of potassium chloride can be dissolved in 200g of water at 80°C, we need to use a proportion.
45.8 grams of potassium chloride / 100 grams of water = X grams of potassium chloride / 200 grams of water
Solving for X, we get:
X = (45.8 grams / 100 grams) * 200 grams = 91.6 grams
Therefore, at 80°C, approximately 91.6 grams of potassium chloride can be dissolved in 200g of water.
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Convert a plasma urea value of 15 mg/dl into mmol/l , given that m.wt of urea is 60.06
Answers
Answer:
2.498 mmol / liter
Explanation:
15 mg / dl would be 150 mg/ liter = .150 gm /l
.150 gm/l / 60.06 gm/ mole = .002498 mole/l = 2.498 mmol/l
The density of lead is 11.4g/cm^3. the mass of a lead ball with a radius of .50mm is?
Answers
The mass of a lead ball with a radius of .50mm is 5.9714226×\(10^{6}\) g
A substance's density is defined as its mass per unit of volume. Density is most frequently represented by the symbol, however Latin letter D may also be used. The formula for density is mass divided by volume.
ρ = m/v
For, v = 4/3π\(r^{3}\)
v = 4/3×3.14×\(50^{3}\)
v = 523,809 \(cm^{3}\)
As, density = mass / volume
11.4 = mass / 523,809
mass = 5971422.6 g
mass = 5.9714226×\(10^{6}\) g
So, the mass of a lead ball with a radius of .50mm is 5.9714226×\(10^{6}\) g
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Which of the following chemical reactions will produce a precipitate?
Answers
Answer:
naclo4+koh naoh+kclo4
Explanation:
if you know your cemestry
Answer:
it's A
Explanation:
20 POINTS: Why it's important for science fair participants to not only create an informative and attractive presentation, but also to detail their information, ideas, and research in a science report.
Answers
Answer:
To show what they know!
Explanation:
If you're not showing how you did your experiment thoroughly, then nobody will understand what you did! For instance, if you spent 2 weeks studying really hard about how music affects different kinds of animals, and only put down that music affects animals and no showing your work. Then no one will know how much effort and work you put into it! If you put all the minor details into the presentation, then more than likely everyone will know where your coming from!
Hope this helps! Plz mark as brainliest!
Find how much mass is in 2.1 moles H2O
Answers
2.1 moles of \(H_2O\) will have a mass of 37.8 grams.
Moles and masses of substancesThe number of moles a substance contains and the mass of the substance are related by the following equation:
Mole = mass/molar mass
In other words, the mole of a substance is the ratio of the mass of the substance and its molar mass.
Rearranging the equation:
Mass = mole x molar mass.
In this case, we want to find the mass of 2.1 moles of water. The molar mass of water can be calculated as follows:
\(H_2O\) = (1 x 2) + 16
= 18 g/mol
Mass of 2.1 moles of water = 2.1 x 18
= 37.8 grams
In other words, 2.1 moles of water will have a mass of 37.8 grams.
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What is the sum of 0.0421 g + 5.263 g +2.13 g to the
correct number of significant digits?
A) 7 g
B) 7.4 g
C) 7.44 g
D) 7.435 g
Answers
Answer: D
Explanation:
The sum total of the given masses to the correct number of significance is 7.44 g. That is option C.
To find the sum of the given figures they are added up together,
0.0421
+
5.263
+
2.13
= 7.4351g
When calculating the addition of terms to the nearest significant figures, the answer should have the same number of decimal places as the term with the fewest decimal places.
The term with the fewest decimal place is 2.13.
Therefore the correct number of significant digits is 7.44 g
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. Which of the following statements is not correct? A. Density has no units. B. Every measurement has a unit tied to it. C. Physical quantities are properties that can be measured. D. the Kelvin degree is larger than the Celsius degree.
Answers
Answer:
A because density DOES have a unit
Explanation:
suppose you have two samples that are equal in weight, 22.3 g zn and 22.3 g cr2o3 . calculate the number of moles of each substance.
Answers
The Number of Moles of Zn is 0.34108 and the number of moles of Cr2O3 is 0.14671.
What is Number of Moles?
The ratio of a substance's given mass in a chemical reaction to the mass of one mole of that material is what determines how many moles there are of that substance. A mole of any substance is equal to 6.0231023, or Avogadro's number. The ratio of a substance's given mass in any kind of chemical reaction to the mass of one mole of that material is the number of moles of that substance.
Moles of Zn can be calculated by using the formula
22.3 g of Zn x 1 mole Zn/65.4 g = 0.341 moles of Zn.
Moles of Cr2O3 can be calculated by using the formula
22.3 g of Cr2O3 x 1 mole Cr2O3/151.99 = 0.146 moles of Cr2O3.
Hence, 0.34108 and 0.14671 will be the number of moles for Zn adn Cr2O3 respectively.
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Zn has a mole count of 0.34108, while Cr2O3 has a mole count of 0.14671.
What is Number of Moles?
The number of moles of a substance is determined by the ratio of its given mass in a chemical reaction towards the mass of one mole of that substance. A mole, or 6.0231023, is equal to one mole of any substance. The number of moles of a substance is defined as the mass of one mole divided by the given mass of the substance in any type of chemical reaction.
The formula can be used to determine moles of zinc.
22.3 g of Zn x 1 mole Zn/65.4 g = 0.341 moles of Zn.
The formula can be used to determine moles of Cr2O3.
22.3 g of Cr2O3 x 1 mole Cr2O3/151.99 = 0.146 moles of Cr2O3.
Therefore, the moles of Zn and Cr2O3 will be 0.34108 and 0.14671, respectively.
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Arrange the following elements based on their size (atomic radii) from largest to smallest: Ca, Ge, Br, K, Kr
Answers
In the titration of a solution of weak monoprotic acid with a 0. 1525 m solution of naoh, the ph half way to the equivalence point was 4. 48. in the titration of a second solution of the same acid, exactly twice as much of a 0. 1525 m solution of naoh was needed to reach the equivalence point. what was the ph half way to the equivalence point in this titration
Answers
The pH half way to the equivalence point in the second titration would be 4.96.
What is titration?Titration is a laboratory technique used to determine the concentration of a sample solution by measuring the volume of a known concentration of a reagent that is added to the sample solution. It is a quantitative analysis method used to determine the amount of a certain substance present in a given solution. It is most commonly used in acid-base titrations, in which the concentration of an acid or base is determined by measuring the volume of a known concentration of a base or acid required to neutralize it.
This is because twice as much of the 0.1525 m NaOH solution was needed to reach the equivalence point, thus the pH would be twice as high as the first titration. This would indicate that the second solution of weak monoprotic acid was more dilute than the first.
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Which of these is the most common greenhouse gas released by
outgasing?
a) Nitrogen
b) Molecular Oxygen (O2)
c) Carbon Dioxide (CO2)
d) Water Vapor
e) Ozone (O3)
Answers
How does an object's mass impact its mechanical energy?
How does an object's speed impact its mechanical energy?
Answers
Therefore, the mechanical energy of an object is proportional to its mass, its height, or its vertical position.
Mechanical energy depends on the position and motion of an object, and its force is the sum of its moving energy and its stored energy. That is, mechanical energy is produced when the potential energy of an object combines with its kinetic energy. The kinetic energy of a moving object is directly proportional to its mass, which is directly proportional to the square of its velocity.
This means that an object with twice the mass and the same velocity has twice the kinetic energy, and an object with the same mass and twice the velocity has four times the kinetic energy. Mechanical energy is defined as the ability of a body to do work. The amount of work an object can do depends on two things position and movement. Before delving further into mechanical energy we need to understand more about how the position and motion of an object affect its energy.
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1.) Give the formula for the alkane containing 500 carbons.
2.) Give the formula for the aliens containing 15 carbons.
Answers
\(\mathfrak{\huge{\orange{\underline{\underline{AnSwEr:-}}}}}\)
Actually Welcome to the concept of General organic chemistry.
1.) The formula for alkanes is Cn H2n+2
===> here n = 500, hence we get as,
C500, 2n+2 = 2(500)+2 ==> 1000+2 ==> 1002
hence the formula is ==> C500 H1002
2.) The formula for alkenes is,
CnH2n
hence, here n = 15
so we get as,
===> C15 H30
T/F : a device driver is a program that controls a device attached to the computer.
Answers
True. Another device driver is an application of software that manages an associated device's connection to the computer.
Describe a computer.A machine is a computing device typically accepts data in the manner of digitally enhanced data and processes it in accordance with a program, piece of software, or set of directions that specify how the information should be handled. Data is replicated from the main memory of the computer, then it is transferred to the hard drive. The range of equipment that writes data toward the disk is known as the drive.
How are computers operated?A computer, an electronic information device, functions by transforming information into binary data (ones and zeros), which are then rearranged into sentences or actions using simple arithmetic.
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Are all the atoms in the same plane for cyclohexanone.
Answers
Answer:
the atoms in cyclohexanone are not in the same
Explanation:
but they are in a benzene ring! Cyclohexane has only sigma bonded carbons with bonds that stick out of the plane
Which of these can be used as an inert electrode?
copper
platinum
silver
zinc
Answers
Answer:
I believe it is platinum
Explanation:
I think it is, haha
Answer:
zinc
Explanation:
kwkejnrkewnrkwe
The reaction with hydrogen with oxygen produces water: 2 H2 + O2 ---> 2H20. How many moles of O2 are required to react with 2.0 mol of H2? *
Answers
o2 is made and hydrogen help make it
What is the density of a 700 kg object with a volume of 649 m'? (Density: D™)
0.927 kg/m
3.4543 kg/m
1.079 kg/m
4.543 kg/m
Answers
Answer: 1.079 kg/m3
Explanation:
The formula for the density is as follows as; Here, D is the density, m is the mass and V is the volume. Density is inversely proportional to the volume and it is directly proportional to the mass. It is given in the problem that density of an object is 700 kg having volume .
d=m/V or p=m/V were d and p are the same thing d stands for density and p is the greek symbol rho so d=p they are the same thing. m stands for mass and V stands for volume
density = mass/Volume
d=700kg/649^3
=1.079 kg/m^3
( Don’t forget (^3) power of 3 because is important for the volume, for ex. m^3 cm^3 km^3 etc)
The answer is 1.079 kg/m^3
what is the pH of a solution with [H+] = 1.25 x 10^-10M?
Answers
pH = -log[H+]
Given [H+] = 1.25 x 10^-10 M:
pH = -log(1.25 x 10^-10)
pH = -log(1.25) + log(10^-10)
pH ≈ -9 + (-10)
pH ≈ -19
Therefore, the pH of the solution with [H+] = 1.25 x 10^-10 M is approximately -19.
Answer:
9.90
Explanation:
Given [H+] = 1.25 x 10^-10 M, we can calculate the pH using the formula:
pH = -log10([H+])
pH = -log10(1.25 x 10^-10)
Using logarithmic properties:
pH = -log10(1.25) - log10(10^-10)
Since log10(10^-10) is equal to -10:
pH = -log10(1.25) - (-10)
pH = -log10(1.25) + 10
Now, evaluating the logarithm using a calculator:
pH = -0.0969 + 10
pH = 9.9031
Therefore, the pH of the solution with [H+] = 1.25 x 10^-10 M is approximately 9.9031. Rounding it to two decimal places, the pH is approximately 9.90.