Answer:
Oxygen Carbon DioxideExplanation:
The compound shown is Carbon Dioxide and is as a result of a covalent bond between Carbon and Oxygen where carbon is sharing two electrons each with the oxygen atoms.
The O is the atomic symbol for Oxygen and the C is the symbol for Carbon. Carbon Dioxide then has the atomic symbol of CO₂ to show the relative number of atoms of each element in it.
When elements chemically combine with each other, what do they Form? A. electrons, B. compounds, C. atoms
Answer:
B
Explanation:
When two distinct elements are chemically combined—i.e., chemical bonds form between their atoms—the result is called a chemical compound. Most elements on Earth bond with other elements to form chemical compounds, such as sodium (Na) and Chloride (Cl), which combine to form table salt (NaCl).
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What information does a molecular formula give?
O A. The actual number of atoms in a molecule
OB. The percent composition of atoms in a molecule
O C. The lowest ratio of atoms in a molecule
O D. The order in which atoms are bonded in a molecule
Answer:
A. The actual number of atoms in a molecule
Explanation:
Molecular formula is simply defined as a type of chemical formula that describes the type and number of atoms present in a single molecule of a compound.
Looking at the options, the correct answer is option A.
Answer:
a
Explanation:
Which of the following correctly describes the location of subatomic particles within an atom?
ОА.
Electrons are located outside of the atom's nucleus.
B. Protons are located inside neutrons.
OC. Neutrons are located inside of electrons.
OD. The nucleus of the atom surrounds the electrons.
Answer:
electrons are located outside of the atoms nucleus
Determine the electron-group arrangement, molecular shape, and ideal bond angle(s) for each of the following:
(a) SO3
(b) N2O (N is central)
(c) CH2C12
Solution :
a). [tex]$SO_3$[/tex]
This compound is known as sulfur trioxide.
The molecular shape of sulfur trioxide is trigonal planer.
And the bond angle is 120°.
b). [tex]$N_2O$[/tex]
This compound is known as Nitrous oxide. Here, nitrogen is in the center. There is no lone pair around the nitrogen atom and it forms two sigma bonds with the other two atoms.
It is linear in shape.
The bond angle between them is 180°.
c). [tex]$CH_2Cl_{2}$[/tex]
This compound is known as the Dichloromethane.
The molecular shape of the compound is tetrahedral.
The bond angles is 120°
A(n) __________ occurs when the moon enters the umbral shadow of the earth without being entirely immersed in it.
partial lunar eclipse
total lunar eclipse
annular eclipse
Answer:
Partial lunar eclipse.
Explanation:
A lunar eclipse is a cosmological event by which, in the presence of the Earth between the Sun and the Moon, the latter does not receive the light of the Sun in the totality of its visible face, with which a part (or the totality ) of her is in the dark.
Thus, if the lunar eclipse implies an absence of sunlight in the entire lunar surface, the eclipse will be total, while if the eclipse implies an absence of light only in part, the eclipse will be partial (which is the most common event).
Imagine that all microorganism suddenly disappeared from earth from what u have learned why do u think that animals would eventually disappeared from earth? Why would plant disappeared
Answer:
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what is carboxylic acid
Carboxylic acids.
Answer:
Carboxylic acid is an organic acid containing a carboxyl group. The simplest examples are methanoic (or formic) acid and ethanoic (or acetic) acid. It is used in the production of polymers, biopolymers, coatings, adhesives, and pharmaceutical drugs. They also can be used as solvents, food additives, antimicrobials, and flavorings.
Explanation:
Hope that helps.
How many grams of sodium chloride are in 100 mL of 1.25 M sodium chloride?
Answer:
7.3125grams
Explanation:
Molarity is the measure of the molar concentration of a solution. It can be calculated using the formula as follows:
Molarity = number of moles (n) ÷ volume (V)
Based on the information given,
Molarity = 1.25 M
Volume = 100 mL = 100/1000 = 0.1 L
Molarity = n/V
1.25 = n/0.1
n = 1.25 × 0.1
n = 0.125mol
Using the below formula to calculate the mass of NaCl;
mole = mass/molar mass
Molar mass of NaCl = 23 + 35.5 = 58.5g/mol
0.125 = mass/58.5
mass = 0.125 × 58.5
mass = 7.3125 grams
Label the states of each compound in the reaction below.
CuSO4( ) + 2KOHC ) + Cu(OH)2( ) + K2SO4( )
Answer:
CuSO₄(aq) + 2KOH (aq) —> Cu(OH)₂(s) + K₂SO₄(aq)
Explanation:
CuSO₄ + 2KOH —> Cu(OH)₂ + K₂SO₄
To know the state of each compounds, we shall determine the complete ionic equation. This can be obtained as follow:
In solution, CuSO₄ and KOH will dissociate as follow:
CuSO₄(aq) —> Cu²⁺(aq) + SO₄²¯(aq)
KOH (aq) —> K⁺ (aq) + OH¯(aq)
CuSO₄(aq) + KOH (aq) —>
Cu²⁺(aq) + SO₄²¯(aq) + 2K⁺(aq) + 2OH¯(aq) —> Cu(OH)₂(s) + 2K⁺(aq) + SO₄²¯(aq)
Note: Cu(OH)₂ is insoluble in water.
Therefore, the elemental equation is:
CuSO₄(aq) + 2KOH (aq) —> Cu(OH)₂(s) + K₂SO₄(aq)
Determine the resulting pH when 75 mL of 0.05M HBr is reacted with 74 mL of 0.075 M KOH
Answer:
pH = 12.08
Explanation:
H⁺ + OH⁻ → H₂OFirst we calculate how many moles of each substance were added, using the given volume and concentration:
HBr ⇒ 0.05 M * 75 mL = 3.75 mmol HBrKOH ⇒ 0.075 M * 74 mL = 5.55 mmol KOHAs HBr is a strong acid, it dissociates completely into H⁺ and Br⁻ species. Conversely, KOH dissociates completely into OH⁻ and K⁺ species.
As there are more OH⁻ moles than H⁺ moles (5.55 vs 3.75), we calculate how many OH⁻ moles remain after the reaction:
5.55 - 3.75 = 1.8 mmoles OH⁻With that number of moles and the volume of the mixture, we calculate [OH⁻]:
[OH⁻] = 1.8 mmol / (75 mL + 74 mL) = 0.0121 MWith [OH⁻], we calculate the pOH:
pOH = -log[OH⁻] = 1.92With the pOH, we calculate the pH:
pH = 14 - pOHpH = 12.08QUESTION 57 Select the diamagnetic ion.
A. Ni2+ B. Cu2+ C. Sr2+ D. Cr3+
Answer:
c
Explanation:
The main criterion for sigma bond formation is that the two bonded atoms have valence orbitals with lobes that point directly at each other along the line between the two nuclei.
a. True
b. False
Answer:
The given statement - The main criterion for sigma bond formation is that the two bonded atoms have valence orbitals with lobes that point directly at each other along the line between the two nuclei , is True.
Explanation:
The above statement is correct , because the sigma bond is produced by the head on overlapping, the orbitals should all point in the same direction.
SIGMA BONDS - Sigma bonds (bonds) are the strongest type of covalent chemical bond in chemistry. They're made up of atomic orbitals that collide head-on. For diatomic molecules, sigma bonding is best characterized using the language and tools of symmetry groups.
Head-on overlapping of atomic orbitals produces sigma bonds. The concept of sigma bonding is expanded to include bonding interactions where a single lobe of one orbital overlaps with a single lobe of another. Propane, for example, is made up of ten sigma bonds, one for each of the two CC bonds and one for each of the eight CH bonds.
Hence , the answer is true .
8.5 g of rubidium are reacted completely with water.
The reaction makes a solution of rubidium hydroxide.
The volume of this solution is 2.5 dm'.
Calculate the concentration of the rubidium hydroxide solution in g dm
(relative atomic mass: Rb = 85; relative formula mass: RbOH = 102)
please how do i work this out
Answer:
3.4g/dm³
Explanation:
Mass concentration = mass of solute/volume of solution
According to this question;
Mass of rubidium = 8.5g
Volume of rubidium hydroxide solution = 2.5dm³
Mass conc. = 8.5/2.5
Mass conc. 3.4g/dm³.
For each of the salts below, match the salts that can be compared directly, using Ksp values, to estimate solubilities.
a. Mg(OH)2
b. CaSO3
c. BaCrO4
d. CaS
1. copper (II) sulfide
2. zinc hydroxide
Answer:
1 - Salts required that can be compared directly, using Ksp values, to estimate solubilities for copper (II) sulfide are - [tex]CaSO_3[/tex] (Option b) ,[tex]BaCrO_4[/tex] (Option c) and [tex]CaS[/tex] (Option d)
2 - Salts that can be compared directly, using Ksp values, to estimate solubilities for zinc hydroxide are - [tex]Mg(OH)_2[/tex] (Option a)
Explanation:
[tex]K_s_p[/tex] values can be used to compare the solubility of salts that produce ions in a 1:1 ratio.
[tex]CuS[/tex] {copper (II)sulfide} dissociates with ions in ratio 1:1 .Because the salts [tex]CaSO_3[/tex] , [tex]BaCrO_4[/tex] and [tex]CaS[/tex] have a 1:1 ion ratio, the solubilities of options b, c, and d can be compared to salt 1.
[tex]K_s_p[/tex] Values can be used to compare the solubility of salts that produce ions in a 1:2 or 2:1 ratio.
2. [tex]Zn(OH)_2[/tex] dissociates into ions in ratio 1:2 .
Because the ions in the salt [tex]Mg(OH)_2[/tex] are in a 1:2 ratio, the solubility of salt 2 can be compared to that of salt 'a'.
Hence , Salt 1 is matched with options b , c , d.
Salt 2 is matched with option a.
how to find molecular weight
Answer:
Using the periodic table of the elements to find atomic weights, we find that hydrogen has an atomic weight of 1, and oxygen's is 16. In order to calculate the molecular weight of one water molecule, we add the contributions from each atom; that is, 2(1) + 1(16) = 18 grams/mole.
Explanation:
hope this helped
what is the photo above showing
what is the vowel.????????????
Answer:
a e i o u
Explanation:
a e i o u
What sort of fossils have been found in Antarctica from about the time of Pangaea (250 MYA)?
Answer:
Lystrosaurus
Explanation:
Lystrosaurus, a vegetarian dinosaur whose name apparently means "trowel dinosaur," inhabited the area in the earliest Triassic period, 220 million years. It is believed to be have been herbivorous which developed to be around one meter long, with an average build similar to a pig. Lystrosaurus skeletons have only been discovered in Antarctic peninsula, India, and Africa.
HELP ASAP CHEM!!!! Please
Answer:
The solubility of gases decreases with pressure as that of solids and liquids is not affected.
Find the percent composition for SF6
S =? %
F =? %
Answer:
S = 21.92 %
F = 78.08 %
Explanation:
To find the percent composition of each element in SF6, we must find the molar mass of SF6 first.
Molar mass of SF6 = 32 + 19(6)
= 32 + 114
= 146g/mol
mass of Sulphur (S) in SF6 = 32g
mass of Fluorine (F) in SF6 = 114g
Percent composition = mass of element/molar mass of compound × 100
- % composition of S = 32/146 × 100 = 21.92%.
- % composition of F = 114/146 × 100 = 78.08%.
A sample of the amino acid tyrosine is barely soluble in water. Would a polypeptide containing only Tyr residues, poly(Tyr), be more or less soluble, assuming the total number of Tyr residues is the same in both cases? Explain.
Answer:
Explanation:
The first thing we need to know is that the amino acid of tyrosine has an aromatic ring within its structure.
Also, recall that aromatics hydrocarbons are considered to be unsaturated and non-polar.
So, since like dissolve like. Then, The non-polar character of tyrosine is enhanced by its aromatic ring. As a result, Tyrosine amino acid is much more soluble in less polar solvents like methanol and ethanol than in moderate highly polar water.
From the given information:
Since water is a very polar solvent, and tyrosine amino acid is not particularly polar, it is just barely soluble in it.
In addition to the aforementioned, peptides are strongly polar in nature. However, as the amount of tyrosine amino acids in a peptide increases, the region of the non-polar portion of the peptide increases (owing to the rise of the aromatic ring), and thus the non-polar value of the peptide will also rise. And this non-polar nature of peptide will make them more soluble in non-polar solvent and decrease its solubility in water (because water is polar in nature). And since peptides are non-polar, they would be more soluble in non-polar solvents and have less solubility in water.
Which element has the largest nuclear charge?
Cs
Li
Mg
S
Answer:
Mg
Explanation:
I think Mg is correct not too sure tho
What story does Ms. McDermid share about maggots helping identify a dead man?
Answer:
The maggots had traces of this man in them and the entomologists found out who he was just by using the DNA in the maggots.
Explanation:
Answer:
She shares how there were maggots found in an empty house and found cocaine on them. By this, they knew that the maggots had been feeding off human remains. They were then able to run more tests and find DNA that were on these maggots and they were able to discover who the victim was.
differentiate between homogenous matter and heterogeneous matter?
Answer:
Homogeneous mixture:
These are called solutions.It has a uniform composition.It has only one phase.It cannot be separated physically.The particles appear smaller in size.These are pure substances.These are not visible easily visible to the naked eye and also through a microscope.Examples include milk, gasoline, sugar solution, corn oil, fog, etc.Heterogeneous mixture:
These are called suspensions/colloids.It has a non-uniform composition.There are two or more phases.It can be separated physically.The particles are either smaller or larger in size.These are not pure substances.These are easily visible to the naked eye and also through a microscopeExamples are- a mixture of mud & water, beach sand, vinegar, air cloud, etc.Which of the following would be a correct conversion factor
relating carbon dioxide (CO2) and glucose (C6H1206) using the
balanced equation below?
6CO2 + 6H20C6H12O6 + 602
Answer:6CO2/1C6H12O6
Explanation:
A sample of NH3 contains 10.0 grams of nitrogen and 25.00 grams of oxygen. Find its percent composition.
N= 0=
Answer:
[tex]\%N=28.6\%\\\\\%O=71.4\%[/tex]
Explanation:
Hello there!
In this case, according to the given information, it is possible to calculate the percent compositions, by dividing the mass of each element by the sum of the masses of the elements as shown below:
[tex]\%N=\frac{m_N}{m_N+m_O} *100\%\\\\\%O=\frac{m_O}{m_N+m_O}*100\%[/tex]
Thus, we plug in the given masses to obtain:
[tex]\%N=\frac{10.0g}{10.0g+25.00g} *100\%=28.6\%\\\\\%O=\frac{25.00g}{10.0g+25.00g}*100\% =71.4\%[/tex]
Regards!
A perfect cube of aluminium metal was found to weigh 20.00g ,the density of the aluminium is 2.70g/ml ,what are the dimensions of the cube
Answer:
1.95cm x 1.95cm x 1.95cm
Explanation:
20.00g / 2.70g/mL = 7.41 mL = 7.41 cm^3
∛7.41 = 1.95cm
90 POINTS
Question
What is the best description of how an electric motor works?
Question 4 options:
Metal electrodes in a solution generate positive and negative ions to turn chemical energy into electrical energy.
One magnet is pushed towards another magnet, causing it to move.
A current runs through a loop of wire in a magnet field; the force from the magnet causes the wire to rotate.
A magnet moves through a stationary coil of wire, causing an electric current to flow through it.
Answer:
A current runs through a loop of wire in a magnet field; the force from the magnet causes the wire to rotate
Explanation:
https://www.jameco.com/Jameco/workshop/ProductNews/motor-buyers-guide.html#:~:text=Electric%20motors%20work%20by%20converting,or%20direct%20(DC)%20current.&text=Electric%20Motors%20have%20an%20array%20of%20applications.
its hard to explain simply because i dont have a mastery over the subject yet myself, but this article should help explain it
if you have any questions, leave them in the comments and i will try to answer them, if this helped, pls give brainliest
Most of the elements in group 1 are classified as
Answer:
alkali metals
Explanation:
:)
The products of a combustion reaction always include oxygen gas and water vapor.
True
Or
False
Answer:
true
Explanation:
A combustion reaction is a reaction in which a substance reacts with oxygen gas, releasing energy in the form of light and heat. Combustion reactions must involve O2 as one reactant. The combustion of hydrogen gas produces water vapor. ... The products of the combustion of hydrocarbons are carbon dioxide and water.