Explanation:
If the pH of a solution is 3, its pOH is 14-3= 11
Directions: Each set of lettered choices below refers to the numbered statements immediately following it. Select the one lettered choice that best fits each statement. A choice may be used once, more than once, or not at all in each set. The following questions refer to the below molecules: (A) CO2 (B) H2O (C) CH4 (D) C2H4 (E) PH3 The molecule that has trigonal pyramidal geometry
Answer:
The given molecules are:
(A) CO2 (B) H2O (C) CH4 (D) C2H4 (E) PH3
Which one has trigonal pyramidal geometry?
Explanation:
According to VSEPR (valence shell electron pair repulsion) theory, a molecule with a central atom having hybridization sp3 and with one lone pair of electrons has trigonal pyramidal geometry.
Among the given molecules,
CO2 has central atom carbon with sp hybridization without lone pairs.
So, it is a linear molecule.
H2O, the central atom is oxygen with sp3 hybridization and oxygen has two lone pairs. So, its geometry is V-shape or bent.
CH4 has central atom carbon with sp3 hybridization and no pairs.
So, its geometry is tetrahedral.
C2H4 ethene has carbon atoms as the central atoms with sp2 hybridization and carbon has no lone pairs.
So, its geometry is trigonal planar.
Answer:
PH3 has central atom P with sp3 hybridization.
P has one lone pair on it.
Hence, the geometry of PH3 is trigonal pyramidal.
what is formed when oxyhaemoglobin splits
Explanation:
The haem is in turn split into iron , which forms chemical compounds as part of the blood iron pool available for future hemoglobin synthesis...
hope this help !!
3
.
The volume occupied by one mole of an ideal gas at 273K and 1.01x10% Pa is 22.4 dm'mol".
What volume of hydrogen, in dm", is produced when excess magnesium ribbon reacts with 100 cm?
of 2.00 mol dm hydrochloric acid?
Mg(s) + 2HCl(aq) → MgCl, (aq) + H2(g)
A.
0.100
B.
2.24
C.
4.48
D.
22.4
Answer:D
Explanation:
Question 9 (1 point)
If a mylar balloon is filled with gas to a volume of 2.9 L at a temperature of 20 degrees celcius and then heated with a heat gun to 150 degrees
celcius, what is the new volume (assume no air escapes the balloon)?
Answer:I’m not sure
Explanation:free trial
How many grams of Al will be deposited from molten AlCl3 by a current of 15.0 amp flowing for 24.0 hr ( 1 Faraday = 96500 C)
0.538 g
0.0335 g
363 g
121 g
Answer:
121 aprox.
Explanation:
mass/molar mass = Q/CF
where mass=?
molar mass of Al=27
Q=It = 15×24×60×60
C=3
F=96500
Will give brainliest
What is ozone depletion in simple words
Answer:
Ozone layer depletion is the thinning of the ozone layer present in the upper atmosphere. This happens when the chlorine and bromine atoms in the atmosphere come in contact with ozone and destroy the ozone molecules. One chlorine can destroy 100,000 molecules of ozone. It is destroyed more quickly than it is created
Answer:
Ozone depletion, gradual thinning of Earth’s ozone layer in the upper atmosphere caused by the release of chemical compounds containing gaseous chlorine or bromine from industry and other human activities. The thinning is most pronounced in the polar regions, especially over Antarctica. Ozone depletion is a major environmental problem because it increases the amount of ultraviolet (UV) radiation that reaches Earth’s surface, which increases the rate of skin cancer, eye cataracts, and genetic and immune system damage. The Montreal Protocol, ratified in 1987, was the first of several comprehensive international agreements enacted to halt the production and use of ozone-depleting chemicals. As a result of continued international cooperation on this issue, the ozone layer is expected to recover over time.
En términos de energía, ¿a qué se debe que sea más difícil detener un camión en comparación a una bicicleta?
Answer:
hola
Explanation:because si
How do catalysts increase reaction rates? *
By increasing the activation energy.
By broadening the energy barrier.
By forming an activated complex with lower energy.
By changing the net thermodynamics of the reaction.
Answer:
By forming an activated complex with lower energy.
Explanation:
When catalyst is added to a reaction , it forms an activated catalyst which has lower activation energy . So initiation of reaction requires less energy and reaction becomes fast .
Hence third option is correct.
what is quantum physics
A student needs to make a solution of 308 mL of 0.02 M of Copper (II) Sulfate. All they have available is a solution of 0.250 M. How many liters should they use?
Answer:
this link not hacl belive me
https://www.flinnsci.com/api/library/Download/18ce587821c24fb3b0ad7d878bd6a3d9Explanation:
In a solution containing 21.2 g sodium carbonate in 1.50 L of solution, calculate
the concentration of the sodium and carbonate ions.
Answer:
0.13 molL-1
Explanation:
We must first obtain the number of moles of sodium carbonate as follows;
Number of moles = mass/molar mass
Number of moles = 21.2 g/106 g/mol
Number of moles= 0.2 moles
Number of moles = concentration × volume
Volume = 1.50 L
Concentration = number of moles/volume
Concentration = 0.2 moles/1.5 L
Concentration = 0.13 molL-1
Beryllium is in Group 2.
What does this tell you about the electronic structure of beryllium?
Answer:
[He] 2s²
Explanation:
En la electrosis del cloruro de sodio (Na Ci) el cloruro es atraido por elcatodo. Falso o verdadero. Y porque?
Answer:
Falso
Explanation:
La electrólisis es la descomposición de una solución cuando la corriente continua se pasa a través de ella.
La corriente entra y abandona el electrolito a través de los electrodos. El electrodo positivo se llama el ánodo mientras el electrodo negativo se llama cátodo.
Los iones positivos se mueven hacia el cátodo, mientras que los iones negativos se mueven hacia el ánodo.
Dado que el cloruro es un ion negativo, se mueve hacia el ánodo y no hacia el cátodo.
How are moles and particles related? How could you find the number of particles in 4 moles of a substance?
Answer:
so in one mole of atom there are 6.02×10^23.
answers to B is 2.41×10^24
Explanation:
use this equation
number of particle=moles X 6.02×10^23
=4 X 6.02 ×10^23
=2.41×10^24
hope this make sense:)
The number of particles present in 4 moles of a substance is 24.088 particles.
What is moles?Moles is a unit to express the amount of any substance and in one mole of any substance 6.022 × 10²³ particles of that substance are present and this number is known as Avogadro's number.
As in 1 mole = 6.022 × 10²³ particles are present
In 4 moles = 4 × 6.022 × 10²³ = 24.088 particles are present
Hence, 24.088 particles are present in 4 moles.
To know more about Avogadro's number, visit the below link:
https://brainly.com/question/10614569
. A circuit is set up with two parallel resistors, each of a resistance of 250Ω. a. What is the total resistance for this circuit?
Answer:
125 ohms
Explanation:
since they're parallel we do
1/total resistance = (1/250 ohms) + (1/250 ohms)
then you get 2/250 ohms
then you flip it so it's equal to total resistance/1
250÷2= 125
The chemical reaction
2 H2 +O2 → 2 H20 is a:
a. synthesis reaction
b. decomposition reaction
c. single displacement reaction
d. double displacement reaction
e. combustion reaction
Answer:
double displacement reaction
ASAAAP HURRRY PLS!!!
Where in aerobic respiration is the largest amount of energy produced?
A)
At the beginning of the cycle, when glucose is oxidized to pyruvate.
B)
At the end of the electron transport chain, when oxygen is reduced.
C)
At the end of the electron-transport chain, when oxygen is oxidized.
D)
At the beginning of the electron transport chain, when oxygen is oxidized.
How does anatomy provide evidence for evolution?
I'll give brainlist!! Simple answer please.
The melting and boiling points of table salt and table sugar are given below.
Why does table salt have much higher melting and boiling point than table sugar?
o A strong ion -ion attractions in table salt
O B. weak ion-ion attractions in table sugar
O C. strong ion-ion attractions in table sugar
O
D. weak ion-ion attractions in table salt
Answer:
weak ion attractions in the table salt
An electron in a hydrogen atom moves from level 1 to level 4. The electron then drops from level 4 to level 2. Which
statement describes the most likely result?
O The energy absorbed in the first move equals the energy released in the second move.
O The energy absorbed in the first move is greater than the energy released in the second move.
O The energy released in the first move equals the energy absorbed in the second move.
O The energy released in the first move is greater than the energy absorbed in the second move.
Answer:
The energy absorbed in the first move is greater than the energy released in the second move
Explanation:
Electrons require (absorb) energy to move to a higher energy level when there is a large external heat source, the presence of an electric field or by colliding with other electrons
And the amount of energy absorbed by the electron is exactly equal to the change in the energy state between the initial energy level of the electron and the destination energy level
Therefore, given that the energy level of the electron at level 2 is higher than the energy level of the electron when at level 1, we have;
The difference in the energy level between level 4 and level 1 is greater than the difference in the energy level between level 4 and level 2 and more energy is absorbed and therefore, released when the electron moves from level 1 to level 4 than when the electron drops from level 4 to level 2.
The most likely result is that 'the energy absorbed in the first move is greater than the energy released in the second move'.
_ As + _ NaOH → _Na3ASO3 + __ H2
Answer:
2As + 6NaOH =2Na3AsO3 +3H2
Explanation:
2As + 6e- = 2As³ ,this is an oxidation reaction
6H¹ +6e- =6H⁰ ,this is reduction process
the above reaction exhibit a redox redox reaction As acts as a reducing agent while NaOH acts as an oxidizing agent.
Please somone help me with a chemistry question brainliest to whoever answers correctly and 20 points
Answer:
3132 is the answer
Explanation:
3BaCl2 + Al2S3 → 3BaS + 2AlCl3
Answer:
Explanation:
Hope this helps u !!
What benefits and drawbacks do you see with maintaining and preserving nature through national parks?
CaC0³ scientific name is?
Answer:
CaC0³ scientific name is Calcium carbonate
Explanation:
Have a great summer :)
What is stoichiometry?
Answer:
hope it help u !!!!
Explanation:
Stoichiometry is the relationship between the relative quantities of substances taking part in a reaction or forming a compound, typically a ratio of whole integers
HELP ;-;
Vanillin, C8H8O3, the principal component of vanilla beans, is very similar to glucose, C6H12O6 a type of sugar. Brittany Spears has a life threatening allergy to vanillin. After one of her concerts she was found dead in her dressing room. A glass lined with a white powder was found smashed on the floor next to her. Police think the glass was lined with vanillin suggesting she was murdered. A 2.54 g sample of this powder underwent carbon-hydrogen analysis. It’s combustion was found to produce 5.875 g of CO2 (g) and 2.41 g of H2O(g) . Find the empirical formula of this compound and determine if Brittany may have been poisoned?
b) Is this evidence enough to conclude for certain that the identity of the powder on the glass is indeed vanillin? Why or why not?
Answer:
The empirical formula is: CH2
Th powder is not vainillin
Explanation:
We can find empirical formula of a compound CₐHₓOₙ knowing that moles CO2 = Moles C, 2 Moles H2O = Moles H and that we can find the mass of oxygen by the difference of masses of the atoms:
Moles C = Moles CO2 -Molar mass: 44.01g/mol-
5.875g * (1mol/44.01g) = 0.1335 moles C * (12.01g/mol) = 1.60gC
Moles H2O and moles H -Molar mass: 18.01g/mol-
2.41g H2O * (1mol / 18.01g) = 0.1339 moles H2O * (2mol H / 1mol H2O) =
0.2676 moles H * (1g/mol) = 0.27g H
The empirical formula of this compound is the ratio of C:H:
0.2676 moles H / 0.1335 moles C = 2
The empirical formula is:
CH2
In vainillin, the moles of Carbon = Moles of Hydrogen. the experiment shows the moles of hydrogen are twice the moles of carbon. Thus, the powder is not vainillin
A reaction requires 22.4 L of gas at STP . There are 25.0 L of gas at 101.5 kPa and 373 K.
Which statement is true?
Use the ideal gas law: PV = nRT where R = 8.31 L-kPa/mol-K
A. There is not enough gas for the reaction.
B. Given this information, there is no way to tell if there is enough gas for the reaction.
C. There is excess gas for the reaction.
D. There is enough gas for the reaction.
Answer:
STP is 101.325 kPa pressure and 273K temperature
Also, at STP, 1 mol of an ideal gas = 22.4 L
Since the question states that 22.4 L are needed at STP, we know that ONE MOLE is needed. Now, the question is, how many moles are actually present?
V = 25.0 L
P = 101.5 kPa
T = 373K
n = ?
R = 8.31 L-kPa/Kmol
Solving the ideal gas law for n (moles) and comparing that to 1 mole, we have...
n = PV/RT = (101.5)(25.0)/(8.31)(373)
n = 0.82 moles of gas. THIS IS NOT ENOUGH as it is less than the ONE mole required.
Explanation:
Cells can regulate different processes in two ways. They can turn on and off the genes that make enzymes, or they can
A)
increase the activation energy of a reaction.
B)
increase the amount of energy needed to carry out the preferred process.
C)
regulate the enzymes that are already made.
D)
decrease the amount of energy needed to carry out the preferred process.
On a warm sunny day, a deer is searching something to drink. The deer is most likely responding to which kind of stimulus?
Answer:
External stimulus of thirst
Answer:
your answer is: the external stimulus of thirst
Explanation:
I took the test :)) hope this helps!!!!!!
is kcn a ternary ionic compound?
Answer:
The given molecule is KCN.
Is it a ternary ionic compound?
Explanation:
A ternary ionic compound is one that consists of at least one polyatomic ion/radical.
In the given molecule,
the ions present are:
K+ and CN-.
CN- is a polyatomic acidic radical.
Hence, the given molecule is ternary ionic compound.
