Answer:
pH ≈ 6.3
Explanation:
To calculate the pH of an aqueous solution, you need to know the hydronium ion (H₃O+) concentration in moles per liter (molarity). The pH is then calculated using the expression:
pH = - log [H₃O+]
Since the solution has an H₃O+ ion concentration of 5.2 × 10⁻⁷ M, we can plug that in and solve:
pH = - log [5.2 × 10⁻⁷]
pH = 6.28
If the density of a liquid 102g/cm^3, how many milligrams will be in 63 mL of that liquid?
Answer:
6426000 mgExplanation:
The mass of a substance when given the density and volume can be found by using the formula
mass = Density × volume
From the question
63 mL = 63 cm³
We have
mass = 102 × 63 = 6426
But 1 g = 1000 mg
6426 g = 6426000 mg
We have the final answer as
6,426,000 mgHope this helps you
Plant structures that increase the surface area for absorption of water and minerals are
a. root hairs b. chloroplast c. guard cells d. lenticels
Answers:
A. root hairs
What is the element Ar classified as in the periodic table?
a noble gas
a halogen
a metalloid
a metal
The element Ar classified as noble gas in the periodic table. Therefore, the correct option is option A.
What is noble gas?The noble gases are a group of chemical elements that share several characteristics. They are all monatomic, odourless, and colourless gases with relatively little chemical reactivity under normal conditions. Oganesson (Og) is a highly radioactive element created synthetically.
Although the IUPAC has included oganesson since "group 18" and "noble gas" have been used interchangeably, oganesson may not be appreciably chemically noble and therefore is projected to deviate from the norm and just be reactive owing to relativistic effects. Its chemistry is still being studied due to the exceptionally short 0.7 ms ½ of its sole known isotope. The element Ar classified as noble gas in the periodic table.
Therefore, the correct option is option A.
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While you are doing your homework, a friend looks over your shoulder and sees electron configurations on your paper. "Whats That?" your friend says. Write down how you would respond to your friend. In your response, explain why the order of electron orbitals in an electron configuration the way it is.
Answer:
The energy of atomic orbitals increases as the principal quantum number, n, increases. In any atom with two or more electrons, the repulsion between the electrons makes energies of subshells with different values of l differ so that the energy of the orbitals increases within a shell in the order s < p < d < f.
Explanation:
I was born in ……… west.
complete this sentense with article
Answer:
Article is
I was born in the west .
balance the equation Na+H2O --> NaOH+H2
Answer:
2Na + 2H2O---->2NaOH + H2
1. A 125 kg box was pushed by applying a
force. The box is accelerated at a rate of
2.0 m/s2. Calculate the applied force.
Answer:
F = 250 N
Explanation:
Given data:
Mass of box = 125 Kg
Acceleration = 2.0 m/s²
Applied force = ?
Solution:
Formula:
F = m×a
F = force
m = mass
a = acceleration
by putting values,
F = 125 Kg × 2.0 m/s²
F = 250 N ( Kg.m/s² = N)
Using newtons second law
[tex]\\ \sf\longmapsto Force=Mass(Acceleration)[/tex]
[tex]\\ \sf\longmapsto Force=125(2)[/tex]
[tex]\\ \sf\longmapsto Force=250N[/tex]
4 Some elements have symbols that do not appear to match their names. For
example, the symbol for sodium is Na. Why is this?
Answer:
It is because some elements have the symbol of their Latin names for example - Latin name of sodium is Natrium and potassium is Kalium .Thatswhy their symbol differs from their modern name .
Protons + Neutrons = the atomic ?
Answer:
The atomic mass number is the number of protons and neutrons in an atom.
All matter is made of atoms and molecules that are
Answer:
broken up into peices
Explanation:
predict the shape and hybridization of platinum tetrachloride (PfCl4)
Answer:
Shape- square planar , hybridisation-sp3
Explanation:
Shape:
VSPER theorey is used to determine both electron geometry and molecular geometry of a molecule.(PtCl4)2 molecular geometry is square planarHybridisation:It undergoes sp3 hybridisation.since there are 2 unpaired electrons in this case, it is paramagnetic in natureTetrachloromethane, CCl4 is produced from the substitution reaction between methane and chlorine gas. If the rate of formation of CCl4 is 0.05 mol dm^-3 min^-1, what is the rate of disappearance of chlorine gas?
The rate of disappearance of chlorine gas : 0.2 mol/dm³
Further explanationThe reaction rate (v) shows the change in the concentration of the substance (changes in addition to concentrations for reaction products or changes in concentration reduction for reactants) per unit time.
For reaction :
[tex]\tt aA+bB\rightarrow cC+dD[/tex]
The rate reaction :
[tex]\tt -\dfrac{1}{a}\dfrac{d[-A]}{dt}= -\dfrac{1}{b}\dfrac{d[-B]}{dt}=\dfrac{1}{c}\dfrac{d[C]}{dt}=\dfrac{1}{d}\dfrac{d[D]}{dt}[/tex]
Reaction for formation CCl₄ :
CH₄+4Cl₂⇒CCl₄+4HCl
From equation, rate of reaction = rate of formation CCl₄ = 0.05 mol/dm³
Rate of formation of CCl₄ = reaction rate x coefficient of CCCl₄
0.05 mol/dm³ = reaction rate x 1⇒reaction rate = 0.05 mol/dm³
The rate of disappearance of chlorine gas (Cl₂) :
Rate of disappearance of Cl₂ = reaction rate x coefficient of Cl₂
Rate of disappearance of Cl₂ = 0.05 x 4 = 0.2 mol/dm³
A 20.0L container holds 0.650 mol of He gas at 37.0C at a pressure of 628.3torr. The new pressure inside the container will be _______ torr if the volume is reduced to 12.0L, the temperature increased to 177C, and 1.25 mol of additional He gas was added.
Answer:
2918.4 torr
Explanation:
From;
PV=nRT
We have that the new conditions of the gas are;
V = 12.0 L
T1 = 177 + 273 = 450 K
n = 1.25 mol
R= 0.082 atm LK-1mol-1
P= ?
P = nRT/V
P = 1.25 * 0.082 * 450/12.0
P = 3.84 atm
Since
1 atm = 760 torr
3.84 atm = 3.84 * 760 = 2918.4 torr
basis for all living things; every living thing contains this element
Answer:
Carbon
Explanation:
Carbon is the primary component of macromolecules, including proteins, lipids, nucleic acids, and carbohydrates.
why in mayonnaise the oil and water aren't separated
Answer:
mayonnaise contains an extra substance, called an emulsifier, which is used to unite the two immiscible ingredients to form a stable, usable emulsion. The emulsifier is made from a hydrophilic (water-loving) head and a hydrophobic (water-hating) tail, which work together to stop the oil from separating out.
Answer:
Hello here it is
Explanation:
The smaller the droplets, the thicker and whiter the mayonnaise. The droplets of oil are suspended in the small amount of water supplied by the yolk and vinegar. They're so tightly packed, they can barely move, but stay separated from one another because they're coated with a thin layer of emulsifiers.
The common name for butanone, a readily available solvent, is
Answer:
methyl ethyl ketone
Explanation:
(MEK)
Using the same sample of gas (P1 = 565 torr , T1 = 27 ∘C ), we wish to change the pressure to 5650 torr with no accompanying change in volume or amount of gas. What temperature T2, in Celsius, is needed to reach this pressure?
Answer:
2726.85 °C
Explanation:
Given data:
Initial pressure = 565 torr
Initial temperature = 27°C
Final temperature = ?
Final pressure = 5650 torr
Solution:
Initial temperature = 27°C (27+273 = 300 K)
According to Gay-Lussac Law,
The pressure of given amount of a gas is directly proportional to its temperature at constant volume and number of moles.
Mathematical relationship:
P₁/T₁ = P₂/T₂
Now we will put the values in formula:
T₂ = P₂T₁ /P₁
T₂ = 5650 torr × 300 K / 565 torr
T₂ = 1695000 torr. K /565 torr
T₂ = 3000 K
Kelvin to degree Celsius:
3000 K - 273.15 = 2726.85 °C
How many moles of nitrogen gas would be produced if 3.27 moles of copper(II) oxide were reacted with excess ammonia in the following chemical reaction? 2 NH3(g) + 3 CuO (s) – 3 Cu(s) + N2(g) + 3 H2O(g)
Moles of Nitrogen(N₂) gas would be produced : 1.09
Further explanationThe reaction coefficient in a chemical equation shows the mole ratio of the components of the reactants and products
If one mole of the reactant or product is known, then we can determine the moles of the other compounds involved in the reaction
Reaction
2NH₃(g) + 3CuO (s) ⇒ 3Cu(s) + N₂(g) + 3 H₂O(g)
Copper(II) oxide was reacted with excess Ammonia, so CuO as a limiting reactant and moles of the product is based on moles of CuO
moles of CuO = 3.27
From the equation, the mol ratio of CuO : mol N₂ = 3 : 1, so mol N₂ :
[tex]\tt \dfrac{1}{3}\times 3.27=1.09[/tex]
A sample of gas at 100 K and exerts a pressure of
5 atm in a rigid container. To what temperature
must the gas be heated in order to increase the
pressure to 8 atm?
Answer: The correct answer for the question would need to be 160 k
Explanation: I used the answer that was posted and it was inincorrect so I solved it myself to get the correct one
Areas of the earth with lots of direct sunlight have warm air.explain why warm air rises and leaves pockets of low pressure behind ?
Answer: Equator
Explanation:
The equator and the regions near the equator receive maximum solar radiation every year. These areas exhibit warm air. The warm air rises and the cools down then further at low pressure zone it might not be able to hold the water vapors. So the water vapors present in the air will cool down and condense in the form of clouds and the rain fall down.
If I have 5 mole of a gas at a pressure of 7.6 atm and a volume of 11 liters, what is the temperature?
Answer:
203.75 K
Explanation:
use the ideal gas law equation: PV=nRT, R being the constant 0.08206 L-atm/mol-K.
plug in the values given:
(7.6 atm) (11.0 L) = (5.0 mol) (0.08206 L-atm/mol-K) (T)
and solve for T!
A solution has a [H+] of 0.20 M. Find the pH of this solution.
The pH of this solution : 0.699
Further explanationpH is the degree of acidity of a solution that depends on the concentration of H⁺ ions. The greater the value the more acidic the solution and the smaller the pH.
pH = - log [H⁺]
So that the two quantities between pH and [H⁺] are inversely proportional because they are associated with negative values.
A solution whose value is different by n has a difference in the concentration of H⁺ ion of 10ⁿ.
A solution has a [H+] of 0.20 M, so [H⁺]=0.2
[tex]\tt pH=-log[H^+]\\\\pH=-log[0.2]\\\\pH=1-log~2\\\\pH=0.699[/tex]
CHRYSan Chemical changes
musical anu nemal langes
Which option is an example of a chemical change?
O preparing a salad
mixing a salad dressing
O digesting a salad
O dicing an onion
1
2
3
4
5
Next →
Answer:
I did this last year I'm so glad and I'm so happy to help you so it will be digesting a salad because if you look at the human body it breaks down as it goes into your body so if you eat it it doesn't look like it changed in front of your eyes but if you don't know it or not it breaks down inside of your organs so it will be digesting a salad
Which option is an example of a chemical property?
density
melting point
rusting ability
boiling point
Calculate the molarity of a 2.43 mol aqueous NaCl solution with a density of 2.00 g/mL.
Answer:
You need to add more points people will not answer if its this low
Explanation:
How many atoms are in 39.2 g of calcium?
a) 6.022 x 10^23 aoms
b) 235.2 x 10^23 atoms
c) 5.89 x 10^23 atoms
d) 40.08 x 10^23 atoms
Answer:
5.89× 10²³ atoms of Ca
Explanation:
Given data:
Mass of Ca = 39.2 g
Number of atoms = ?
Solution:
Number of moles of Ca:
Number of moles = mass/molar mass
Number of moles = 39.2 g/40.078 g/mol
Number of moles = 0.978 mol
The given problem will solve by using Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.
The number 6.022 × 10²³ is called Avogadro number.
1 mole = 6.022 × 10²³ atoms
0.978 mol × 6.022 × 10²³ atoms / 1 mol
5.89× 10²³ atoms of Ca
When two hydrogen atoms combine with one oxygen atom, what is the result?
A. solution
B. compound
C. mixture
D. none of the above
Sarah loves animals and wants to become a veterinarian one day. She decides to learn all she can about vertebrates, and she finds that they all have certain characteristics in common. Identify and explain the traits that vertebrates have in common.
Answer:
Vertebrates have spines as Invertebrates don't
Explanation:
Vertebrates Invertebrates
They have spine or backbone. These animals lack the spine or backbone.
Notochord, a self-supporting rod, is present in the embryos during the embryonic period. They lack notochord.
Generally, large and fast-moving animals. Generally, small and slow-moving animals.
Why does the Sun gravitationally dominate all other objects in the Solar System?
A mixture of hydrocarbons contains 34.8% heptane, C7H16, 10.1% nonane, C9H20, and 55.1% octane, C8H18. The mixture is combusted in an excess of oxygen. What mass of CO2 is generated from the combustion of 17.0 kg
of the mixture?
:
Mass Heptane : 0.348 x 17 = 5.916 kg
mass C in Heptane (MW=100.21 g/mol) :
[tex]\tt \dfrac{7.12}{100.21}\times 5.916=4.959~kg[/tex]
Mass Nonane : 0.101 x 17 = 1.717 kg
mass C in Nonane (MW=128.2 g/mol) :
[tex]\tt \dfrac{9.12}{128.2}\times 1.717=1.446~kg[/tex]
Mass Octane : 0.551 x 17 = 9.367 kg
mass C in Otane (MW=114.23 g/mol) :
[tex]\tt \dfrac{8.12}{114.23}\times 9.367=7.872~kg[/tex]
Total mass produced :
4.959+1.446+7.872=14.277 kg
The branch of science which deals with chemicals is called chemistry.
The correct answer is 14.277 kg
The calculation part is as follows:-
Mass Heptane : [tex]0.348 * 17 = 5.916 kg[/tex] Mass C in Heptane (MW=100.21 g/mol) :[tex]\frac{7.12}{100.21} *5.916 = 4.959kg[/tex]
Mass Nonane : [tex]0.101 * 17 = 1.717 kg[/tex] Mass C in Nonane (MW=128.2 g/mol) :
[tex]\frac{9.12}{128.2} *1.717 =1.446kg[/tex]
Mass Octane : [tex]0.551 * 17 = 9.367 kg[/tex] Mass C in Otane (MW=114.23 g/mol) :
[tex]\frac{8.12}{114.23}*7.872 kg[/tex]
Total mass-produced is
[tex]4.959+1.446+7.872=14.277 kg[/tex]
Hence, the correct answer is - 14.277kg.
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