The growth of a certain plot was measured over a period of more than a month. How many centimeters did the plant grow between day 10 and day 30. 0.5 cm 1.0 cm 1.5 cm 2 cm
Answer:
2cm would be the answer I think
Calculate the equilibrium concentration of H3O in the solution if the initial concentration of C6H5COOH is 0.056 M . Express your answer using two significant figures.
Answer:
1.9 × 10⁻³ M
Explanation:
Step 1: Write the acid ionization of benzoic acid
C₆H₅COOH(aq) + H₂O(l) ⇄ C₆H₅COO⁻(aq) + H₃O⁺(aq)
Step 2: Calculate the acid ionization constant (Ka) of benzoic acid
The pKa of benzoic acid is 4.20
pKa = -log Ka
Ka = antilog -pKa = antilog -4.20 = 6.31 × 10⁻⁵
Step 3: Calculate the equilibrium concentration of the hydronium ion
Considering that the initial concentration of the benzoic acid is Ca = 0.056 M, we can calculate the equilibrium concentration of the hydronium ion using the following expression.
[H₃O⁺] = √(Ca × Ka) = √(0.056 × 6.31 × 10⁻⁵) = 1.9 × 10⁻³ M
How many milliliters of 0.500 M HBr would be required to react with 40.0 mL of 0.300 M Ca(OH)2?
Answer:
48dm³
Explanation:
Given reaction:
Ca(OH)₂ + 2HBr → CaBr₂ + 2H₂O
Parameters:
Concentration of HBr = 0.5M
Volume of Ca(OH)₂ = 40mL
Concentration of Ca(OH)₂ = 0.3M
Solution:
To solve this problem, we are going to use the mole concept. We solve from the known specie to the unknown.
We first find the number of moles of the known specie which is the Ca(OH)₂ ;
number of moles = concentration x volume
number of moles = 0.3 x 40 x 10⁻³ = 0.012moles
From the reaction equation;
1 mole of Ca(OH)₂ requires 2 moles HBr
0.012 moles of Ca(OH)₂ will require 0.012 x 2 = 0.024moles of HBr
Now,
To find the volume of HBr;
Volume = [tex]\frac{number of moles }{concentration}[/tex]
Volume = [tex]\frac{0.024}{0.5}[/tex] = 0.048dm³
In mL;
Volume 0.048 x 1000 = 48dm³
.
Can you explain why you feel warm when you are standing near a campfire?
Answer:
You feel warm when you stand near a campfire because the flames of the fire warm your body. The heated waves are hit towards you and your body feels warm.
Hope this helped :)
Explanation:
the acid present in our stomach is ________.
A.nitric acid
B.sulphuric acid
C.hydrochloric acid
D.carbonic acid
Answer:
c, hydrochloric acid
Explanation:
A dolphin can travel 30 miles in 2 hours. What is the dolphin's speed (Remembers = d+t)
Answer:
The dolphin's fast cruising speed (a travelling speed they can maintain for quite a while) is about 3-3.5 m/s (6-7 knots, 11-12.5 km/hr)
Explanation:
so 37 kilometers
A girl goes to the doctor because she is dealing with a terrible case of acne. The doctor tells her it is due to clogged ducts. Which gland is most likely having a problem?
sebaceous
adrenals
pineal
thyroid
Answer:
Sebaceous
Explanation:
Answer:
Sebaceous
Explanation:
Just did the assignment
What volume (in mL) will a sample of F2 gas occupy in a syringe at 5.5 atm, if the F2 has a volume of 25.0 mL at 1.2 atm?
Answer:
5.45mL
Explanation:
Using Boyle's law equation:
P1V1 = P2V2
Where; P1 = initial pressure
P2 = final pressure
V1 = initial volume
V2 = final volume
According to this question, P1 = 1.2atm, V1 = 25mL, P2 = 5.5atm, V2 = ?
1.2 × 25 = 5.5 × V2
30 = 5.5V2
V2 = 30/5.5
V2 = 5.45mL
Therefore, 5.45 mL sample of F2 gas will occupy a syringe at 5.5atm.
A bomb calorimeter with a heat capacity of 837 J∘C contains 745 g of water. It burns 2.50 g C8H18 resulting in the temperature going from 15.0∘C to 33.8∘C. What is the value of the heat transferred (in kilojoules) by the reaction from the perspective of the system?
Answer:
74.3kJ are transeferred
Explanation:
In the bomb calorimeter, the burning of C₈H₁₈ is producing heat that is been absorbed for the calorimeter and the water.
Heat absorbed calorimeter:
837J/°C * (33.8°C-15.0°C) = 15735.6J
Heat absorbed water:
C*m*ΔT
C specific heat of water (4.184J/g°C), m is mass of water (745g), and ΔT change in temperature (33.8°C - 15°C = 18.8°C)
4.184J/g°C*745g*18.8°C = 58601.1J
Heat released by the reaction:
15735.6J + 58601.1J = 74336.7J
74.3kJ are transeferred
what is the relationship between the atomic number and the melting and boiling point
Answer:
As the atomic number of elements increases, the melting point increases because there are more electrons around the nucleus, which creates a stronger negatively-charged force. With stronger forces, the melting point rises. 3. Non-metals usually have low melting points.
Explanation:
The melting point rises as the atomic number of elements increases because there are more electrons surrounding the nucleus, creating a stronger negatively charged force. The melting point rises as the forces become stronger.
What is nucleus?The nucleus is made up of protons, which are positively charged, and neutrons, which are electrically neutral. Quarks are particles that make up protons and neutrons. The nucleus (plural, nuclei) is a positively charged region in the atom's center. It is made up of two types of subatomic particles that are tightly packed together. Protons, which have a positive electric charge, and neutrons, which have a neutral electric charge, are the particles. The nucleus is the most important component of the cell (plural: nuclei). It is derived from a Latin word that means "nut kernel." Definition of Nucleus: A nucleus is a double-membraned eukaryotic cell organelle that contains genetic material.To learn more about nucleus, refer to:
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Lions and cheetahs live in the same area and both eat they same type of prey. Which type of competition occurs between a lion and a cheetah?
intraspecific
predator-prey
interspecific
mutualism
Science...............
how light warms up matter
Answer:
Tom Zepf of the physics department at Creighton University in Omaha, Neb., notes that "Sunlight heats a material such as water or a brick primarily because the long wavelength, or infrared, portion of the sun's radiation resonates well with molecules in the material, thereby setting them into motion.
branliest pls?????/
Explanation:
A student ran the following reaction in the laboratory at 751 K: N2(g) + 3H2(g) 2NH3(g) When she introduced 3.47×10-2 moles of N2(g) and 6.38×10-2 moles of H2(g) into a 1.00 liter container, she found the equilibrium concentration of H2(g) to be 6.25×10-2 M. Calculate the equilibrium constant, Kc, she obtained for this reaction.
Answer:
Kc = 4.86×10⁻⁶
Explanation:
We begin from the equation:
N₂ + 2H₂ ⇄ 2NH₃
We start from 3.47×10⁻² moles of N₂(g) and 6.38×10⁻² moles of H₂(g), so when we reach the equilibrium, we get 6.25×10⁻² moles of H₂.
This data means, that in the reaction we made react:
6.38×10⁻² - x = 6.25×10⁻²
x = 1.3×10⁻³ moles of H₂
As stoichiometry is 1:3, we will know that the moles of N₂ that have been reacted were:
1.3×10⁻³ moles / 3 = 4.33×10⁻⁴ moles of N₂
So, in the equilibrium we would have:
3.47×10⁻² moles of N₂ - 4.33×10⁻⁴ moles of N₂ = 0.0343 moles of N₂
How many ammonia, would we have in the equilibrium?
4.33×10⁻⁴ mol . 2 = 8.66×10⁻⁴ moles (from stoichiometry with N₂, 1:2)
(1.3×10⁻³ mol . 2) / 3 = 8.66×10⁻⁴ moles (from stoichiometry with H₂, 2:3)
Let's make the expression for Kc
Kc = [NH₃]³ / [N₂] . [H₂]²
(8.66×10⁻⁴ )³ / (0.0343 . (6.25×10⁻²)² = 4.86×10⁻⁶
CH3F contains polar covalent bond?
Answer:
CH3F is a polar molecule due to the presence of a very electronegative fluorine (3.98) as one of the outer atoms which pulls electrons towards it inducing a partial negative charge
Explanation:
How many atoms are there in 46.4 g of sulfur?
Answer:
371.2
Explanation:
The volume of a single molybdenum atom is 1.05*10^-23 cm^3. What is the volume of a molybdenum atom in micro liters
Answer:
1.05 × 10^-20 microlitres
Explanation:
The computation of the volume of a molybdenum atom in micro liters is shown below:
As we know that
1 litre = 1000cm^3
1 microlitre= 10^-6 litre
Therefore
1 cm^3 = 10^3 microlitres.
hence,
1.05 × 10^-23 cm^3 = 1.05 × 10^-20 microlitres
Hence, the volume of a molybdenum atom in micro liters is 1.05 × 10^-20 microlitres
The same is to be considered
what is true about mass
Answer:
Mass is both a property of a physical body and a measure of its resistance to acceleration (a change in its state of motion) when a net force is applied. An object's mass also determines the strength of its gravitational attraction to other bodies.
Explanation:
I have leaned it
Which type of bonds do polar covalent bonds break down in chemical reactions?
A. polar covalent and ionic bonds
B. nonpolar covalent bonds and polar covalent bonds
C. ionic bonds and nonpolar bonds
D. none of the above
Answer:
(C) im pretty sure is the answer
Explanation:
The type of bonds does polar covalent bonds break down in chemical reactions is ionic bonds and nonpolar bonds. Therefore, option C is correct.
What is an ionic bond ?Ionic bond is also known as electrovalent bond. The term ionic bond is defined as a chemical bond formed when one atom gives up one or more electrons to another atom.
It is also defined as when positively charged particle produce a bond with negatively charged particle. The chemical molecule sodium chloride is an example of an ionic bond.
In ionic bonding, the electrostatic attraction between oppositely charged ions, or between two atoms with sharply different electronegativities. The type of bonds does polar covalent bonds break down in chemical reactions is ionic bonds and nonpolar bonds.
Thus, option C is correct.
To learn more about the ionic bond, follow the link;
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