Answer:
Continental drift describes one of the earliest ways geologists thought continents moved over time. Today, the theory of continental drift has been replaced by the science of plate tectonics.
Explanation:
Answer:
a giant landmass where all the continents were connected
Explanation:
Pangea was C-shaped, with the bulk of its mass stretching between Earth's northern and southern polar regions. The curve of the eastern edge of the supercontinent contained an embayment called the Tethys Sea, or Tethys Ocean. The Paleo-Tethys Ocean took shape during Pangea's initial assembly phase.
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.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!
can anyone help with this mole to mole/mole to grams question? any help would be greatly appreciated! Thanks!
Answer:
Explanation:
a) 3.00 mol Cu x 2 mol Ag/ 1 mol Cu = 6 mol Ag
b) 3.00 mol Cu x 2 mol Ag/1 mol Cu x 107.87g Ag/ 1 mol Ag = 647.22g Ag
c) 3.00 mol Cu x 1 mol Cu(NO3)2/ 1 mol Cu = 3 mol Cu(NO3)2
d) 3.00 mol Cu x 1 mol Cu(NO3)2/ 1 mol Cu x 187.54g/ 1 mol Cu(NO3)2 =562.644g Cu(NO3)2
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%.
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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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
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.
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).
MARK AS BRAINLEST!!
1. What is the composition
of Ca(No2)2
Answer:
1 Calcium, 2 Nitrogen, and 4 oxygen
Explanation:
there is no number before of after Ca(calcium), so there is only 1. No(nitrogen) has no number next to it so there would be only 1 of it,but there is a 2 after the parenthesis so there is 2 nitrogen (2*1=2). O(oxygen) has a two next to it so there would be only 2 oxygen, but there is a two after the parenthesis so instead there are 4 oxygen because 2*2=4. Hope this helped you <3
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
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.
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.
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:
Somebody please answer
A sample of gas at 500 mm Hg inside a steel tank is cooled from 773 K to 273 K. What is the final pressure of the gas in the steel tank?
Answer:
177 mmHg
Explanation:
Given that:
The sample of a gas is with Pressure (1) [tex]P_1[/tex] = 500 mmHg
The initial temperature [tex]T_1[/tex] = 773 K
The final temperature [tex]T_2[/tex] = 273 K
Using ideal gas equation:
[tex]\dfrac{P_1}{T_1} = \dfrac{P_2}{T_2} \\ \\ \dfrac{500}{773} = \dfrac{P_2}{273} \\ \\ (136500) = 773 \times P_2 \\ \\ P_2 = \dfrac{136500}{773} \\ \\ P_2 = 176.58 \ mmHg \\ \\ \simeq 177 mmHg[/tex]
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 .
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 = 12.08How many H2O molecules are in 183.2 grams of H20 gas?
Answer: There are [tex]61.24 \times 10^{23}[/tex] molecules present in 183.2 grams of [tex]H_{2}O[/tex] gas.
Explanation:
Given: Mass = 183.2 g
Number of moles is the mass of substance divided by its molar mass.
As molar mass of water is 18 g/mol. Therefore, moles of [tex]H_{2}O[/tex] are calculated as follows.
[tex]Moles = \frac{mass}{molar mass}\\= \frac{183.2 g}{18 g/mol}\\= 10.17 mol[/tex]
According to the mole concept, there are [tex]6.022 \times 10^{22}[/tex] molecules present in one mole of a substance.
Hence, molecules present in 10.17 moles are calculated as follows.
[tex]10.17 mol \times 6.022 \times 10^{23}\\= 61.24 \times 10^{23}[/tex]
Thus, we can conclude that there are [tex]61.24 \times 10^{23}[/tex] molecules present in 183.2 grams of [tex]H_{2}O[/tex] gas.
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 gas container has a volume of 446.9 with a temp of 14c. When the volume is decreased to 238.7l the new temp is what
Answer:
[tex] \frac{V _{1}}{T _{1}} = \frac{V _{2}}{T _{2} } \\ \frac{446.9}{(14 + 273)} = \frac{238.7}{T _{2} } \\ {T _{2}} = \frac{238.7 \times 287}{446.9} \\ {T _{2}} = 153.3 \: kelvin \\ = 119.7 \degree \: c[/tex]
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)
Which element has the largest nuclear charge?
Cs
Li
Mg
S
Answer:
Mg
Explanation:
I think Mg is correct not too sure tho
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.
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:
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).
Calculate the ph of a buffer solution that contains 0.25 M benzoic acid (c6h5co2h) and 0.15M sodium benzoate (c6h5coona) . Ka=6.5×10-5
Answer:
4.0
Explanation:
we have a buffer system formed by a weak acid (benzoic acid C₆H₅O₂H) and its conjugate base (benzoate ion C₆H₅O₂⁻, coming from sodium benzoate C₆H₅O₂Na). Given the acid dissociation constant (Ka) for benzoic acid is 6.5 × 10⁻⁵, we can calculate the pH of the buffer solution using the Henderson-Hasselbach equation.
pH =pKa + log [base]/[acid]
pH =-log Ka + log [C₆H₅O₂⁻]/[C₆H₅O₂H]
pH =-log 6.5 × 10⁻⁵ + log (0.15 M/0.25 M) = 4.0
HELP ASAP CHEM!!!! Please
Answer:
The solubility of gases decreases with pressure as that of solids and liquids is not affected.
A solution with a ph of 5 has how many more hydrogen ions in it than a solution with a ph of 7?
Propane burns in air to form water vapor and another gas. What is the volume of the water vapor at 500°C and 1 atm?
Answer:
253.85 L
Explanation:
We'll begin by writing the balanced equation for the reaction. This is illustrated below:
C₃H₈ + 5O₂ —> 3CO₂ + 4H₂O
From the balanced equation above, 4 moles of water vapor were produced.
Finally, we shall determine the volume of the water vapor produced as follow:
Mole water vapor (n) = 4 moles
Pressure (P) = 1 atm
Temperature (T) = 500 °C = 500 °C + 273 = 773 K
Gas constant (R) = 0.821 atm.L/Kmol
Volume (V) =?
PV = nRT
1 × V = 4 ×0.0821 × 773
V = 253.85 L
Thus, the volume of water vapor obtained is 253.85 L
Most of the elements in group 1 are classified as
Answer:
alkali metals
Explanation:
:)
QUESTION 57 Select the diamagnetic ion.
A. Ni2+ B. Cu2+ C. Sr2+ D. Cr3+
Answer:
c
Explanation: