. Given the following pOH's, calculate the pH for the solution:
a) pOH = 4.18 b) pOH = 12.35
4. Given the following pH's, calculate the pOH for the solution:
a) pH = 6.2 b) pH = 9.55
Answer:
a) pH = 9.82 b) pH = 1.65
a) pOH = 7.8 b) pOH = 4.45
Explanation:
pOH + pH = 14 for all of these solutions.
pH is a quantitative measure of the acidity or basicity of aqueous or other liquid solutions.
3.a)Given;
pOH = 4.18
To Find;
pH = ?
We know that
pH + pOH = 14
pH = 14 – pOH
pH = 14 – 4.18
pH = 9.82
Thus, The pH of the solution is 9.82
b)Given;
pOH = 2.35
To Find;
pH = ?
We know that
pH + pOH = 14
pH = 14 – 2.35
pH = 14 – 2.35
pH = 11.65
Thus, The pH of the solution is 11.65
4. a)
Given;
pH = 6.2
To Find;
pOH = ?
We know that
pH + pOH = 14
pOH = 14 – pH
pOH = 14 – 6.2
pOH = 7.8
Thus, The pOH of the solution is 7.8
4. b)
Given;
pH = 9.55
To Find;
pOH = ?
We know that
pH + pOH = 14
pOH = 14 – pH
pOH = 14 – 9.55
pOH = 4.45
Thus, The pOH of the solution is 4.45
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A whole lemon is sliced into smaller pieces of lemon. Is this an example of a chemical or a
physical change?
The fossils found in the bottom layers of sedimentary rock are probably?
Answer:
Animal remains are most likely to be fossilized if their hard parts are covered by layers of sediments soon after death. With time and pressure, these sediments, such as sand, plant debris, or ash, become compressed into rock. Therefore, fossils are found in sedimentary rock, like sandstone, shale, limestone and coal.
Explanation:
In this scenario would it be an endothermic or exothermic reaction
Sodium and chlorine combine in an explosive reaction to form table salt.
Answer:
Exothermic
Explanation:
because it is releasing energy into the air in the blast radius.
How do humans spread Asian Carp?
a
They find their eggs in the river and give them to scientists to study.
b
They tell authorities when they catch one and they throw them back
c
They use them as live bait in new places of open gates with their boats.
d
They clean and drain their boats after they have gone fishing in a lake.
Answer:
d
Explanation:
Which statement about planetary orbits is correct?
O A. The planets travel in perfect circles around the sun.
O B. The planets travel in perfect circles around Earth.
O C. The planets travel in ellipses around the sun.
OD. The planets travel in ellipses around the moon.
Answer: C planets dont travel in perfect circles and they do not orbit earth they orbit the sun and they ellipse around the sun. this is the correct answer do not lsiten to the other person
Explanation:
The statement which is correct about planetary orbits is the planets travel in ellipses around the sun.
What are orbits?Orbits is the path of the motion, in which planets do revolutionary motion in a particular sequence.
In the solar system, sun is present at the center and all the planets do revolution around the sun in their orbits which are ellipse in their shape. Elliptical shape of the orbits is due the large distance of planets from the sun which reduces the speed due to less gravitational force of sun on that object.
Hence, option (C) is correct i.e. The planets travel in ellipses around the sun.
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Replicate the following DNA strand: 5' TGATACTTC 3'
Answer:
a
c
t
a
t
g
a
a
g
Explanation:
How many grams of aluminum is produced when 82.4 grams of aluminum chloride
decomposes into chlorine gas and aluminum metal?
2AICI: - 2 Al + 3C12
Answer:
16.6 g of Al are produced in the reaction of 82.4 g of AlCl₃
Explanation:
Let's see the decomposition reaction:
2AlCl₃ → 2Al + 3Cl₂
2 moles of aluminum chloride decompose to 2 moles of solid Al and 3 moles of chlorine gas.
We determine the moles of salt:
82.4 g . 1mol/ 133.34g = 0.618 moles
Ratio is 2:2. 2 moles of salt, can produce 2 moles of Al
Then, 0.618 moles of salt must produce 0.618 moles of Al.
Let's convert the moles to mass → 0.618 mol . 26.98g /mol = 16.6 g
HCI + Zn --> H2 + ZnCl2
(Zinc in hydrochloric acid)
single replacement
double replacement
synthesis
decomposition
Answer:
Single replacement
Explanation:
Zn replaces the halogen (Cl) from HCl
It is a single replacement reaction
What is matter with a composition that is always the same
Answer:
The answer is substances
Matter with a composition that is always the same is defined as a pure substance.
What is matter?Matter in chemistry, is defined as any kind of substance that has mass and occupies space that means it has volume .Matter is composed up of atoms which may or not be of same type.
Atoms are further made up of sub atomic particles which are the protons ,neutrons and the electrons .The matter can exist in various states such as solids, liquids and gases depending on the conditions of temperature and pressure.
The states of matter are inter convertible into each other by changing the parameters of temperature and pressure.
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Calculate the molar concentration of OH ions in a 0.066 M solution of ethylamine (C2H5NH2: Kb= 6.4 x 10-)
Express your answer to two significant figures.
Answer:
6.5x10⁻³M = [OH⁻]
Explanation:
The Kb of a Weak base as ethylamine is expressed as follows:
Kb = [OH⁻] [C₂H₅NH₃⁺] / [C₂H₅NH₂]
As the equilibrium of ethylenamine is:
C₂H₅NH₂(aq) + H₂O(l) ⇄ C₂H₅NH₃⁺(aq) + OH(aq)
The concentration of C₂H₅NH₃⁺(aq) + OH(aq) is the same because both ions comes from the same equilibrium. Thus, we can write:
Kb = [OH⁻] [C₂H₅NH₃⁺] / [C₂H₅NH₂]
6.4x10⁻⁴ = [X] [X] / [C₂H₅NH₂]
Also, we can assume the concentration of ethylamine doesn't decrease. Replacing:
6.4x10⁻⁴ = [X] [X] / [0.066M]
4.224x10⁻⁵ = X²
6.5x10⁻³M = X
6.5x10⁻³M = [OH⁻]The molar concentration of OH ions in a 0.066 M solution of ethyl amine is [tex]6.5x10^-^3M[/tex]
What is molar concentration?Molar concentration is the measure of the concentration of the chemical species present in any solution.
Step1: Calculating The Kb
[tex]Kb = [OH^-]\dfrac{ [C_2H_5NH_3^+] }{[C_2H_5NH_2]}[/tex]
As the equilibrium of ethyl amine is:
[tex]\rm C_2H_5NH_2(aq) + H_2O(l) <-> C_2H_5NH_2^+(aq) + OH(aq)[/tex]
[tex]Kb = [OH^-]\dfrac{ [C_2H_5NH_3^+] }{[C_2H_5NH_2]}[/tex]
[tex]6.4\times10^-^4 = \dfrac{ [X][X]}{[C_2H_5NH_2]}[/tex]
The concentration of ethyl amine does not decrease.
[tex]\rm 6.4\times10^-^4 = \dfrac{ [X][X]}{0.066\;M}[/tex]
[tex]4.224\times10^-^5 = X^2[/tex]
[tex]6.5x10^-^3M = X\\\\6.5x10^-^3M = [OH^-][/tex]
Thus, the molar concentration is [tex]6.5x10^-^3M[/tex]
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In cellular respiration, living things use sugar to produce energy.
True or false
A peach falls from a tree with an acceleration of 9.8 m/s2. The peach has a mass of
7.4 g. How much force acts on the peach? (Hint: Convert g to kg)
Answer:
F = 0.0725 N
Explanation:
Given that,
The mass of peach, m = 7.4 g
We need to find the force acts on the peach when it falls from a tree. The force is given by :
F = mg
So,
[tex]F=7.4\times 10^{-3}\times 9.8\\\\F=0.0725\ N[/tex]
So, the force is 0.0725 N.
calculate the number of moles present in 9.50 of co2
Answer:
0.4318 mol
Explanation:
moles = mass/molar mass
moles = 9.50/22
A levee is a human-made feature that is designed to reduce the damage done by a.lighting b.floods c.earthquakes d.landslides
Answer:
not sure but I think its b
Answer:
the answer is about your question isb.floods
PLZ HELPPPP TIMED TESTT!!!!!!?????
Answer:
my probably best answer is B
18. Potassium sulfate reacts with copper (II) bromide to produce potassium bromide and
copper (II) sulfate.
Answer:
H2SO3(aq) + KOH(aq) ---> 2H2O(l) + K2SO3(aq)
Explanation:
please help.. Which of the following events is most likely to cause an environmental disturbance in a grassland biome? A. Earthquake B.volcanic eruption C. hurricane D. fire caused by lightning
Answer:
D. Fire caused by lightning
Fire caused by lightning is the event which is most likely to cause an environmental disturbance in a grassland biome.
What is the effect of fire on grassland?Fire caused by lightning is the cause of environmental disturbance in a grassland biome because the fire can burn all the grassland vegetation which directly influence the organisms of that biome.
So we can conclude that fire caused by lightning is the event which is most likely to cause an environmental disturbance in a grassland biome.
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3 A partial desert food web is shown.
Coyote
Jackrabbit
€
Kangaroo
rat
Seeds
Shrubs
Which type of organism is missing from this food web?
A. Decomposer
B. Predator
C. Consumer
D. Producer
ОА
How are the environments of a desert and a tundra different? A tundra is at a higher latitude than a desert. A tundra is more humid than a desert. A tundra is much warmer than a desert. A tundra receives less precipitation than a desert.
Answer: a tundra is at a higher latitude than a desert.
The environments of a desert and a tundra different because tundra is at a higher latitude than a desert. Therefore, option A is correct.
What is the main difference between a desert and a tundra?Temperature is the primary distinction between desert and tundra biomes. The desert has very warm temperatures, which can become extremely hot at times.
Extreme temperatures in some deserts can exceed 130 degrees Fahrenheit. Tundras are extremely cold, with many areas remaining frozen throughout the year.
Tundra regions typically receive less than 25 centimeters (10 inches) of precipitation per year, making them deserts. For six to ten months of the year, they have long, cold winters with high winds and average temperatures below freezing.
Thus, option A is correct.
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is a hot dog a sandwich?
Answer:
The U.S. Department of Agriculture (USDA) describes a sandwich as “a meat or poultry filling between two slices of bread, a bun, or a biscuit.” By that definition, sure, a hot dog is a sandwich.
Explanation:
. Which of these statements about density is true? O Larger objects are more dense. O Density of an object changes if you cut it in half Density is a physical property. O The density of an object depends on the force of gravity.
Answer:
Choice 3 (Density is a physical property)
Explanation:
An object can be larger but not more dense than a smaller object. The density will stay the same if an object is split because density is mass divided by volume. If you divide the density the mass and volume get divided by the same amount, so it is the same. Gravity does not affect density
plsssss help !! what are the steps to convert from atoms, compounds, formula units, ect to moles
Answer:
Explained below.
Explanation:
From avogadro's number, we know that;
1 mole = 6.022 × 10^(23) atoms, molecules, protons e.t.c.
Now,to convert from atoms, compounds, formula units, etc to moles, what we will do is just to divide the amount of the particle value given in the specific units by avogadro's number.
For example, to convert 23 × 10^(20) atoms to moles, we will have;
Number of moles = (23 × 10^(20))/(6.022 × 10^(23)) moles = 0.00382 moles
What was the name of the super continent that existed when all the
continents were connected? *
O Pangea
O Megacontinent
Ultra continent
O Karen
Answer:
Pangea
Explanation:
Pangea was a supercontinent that existed during the late Paleozoic and early Mesozoic eras. It assembled from earlier continental units approximately 335 million years ago, and began to break apart about 175 million years ago. Forming into what we have today :)
What is the word equation for molecules of magnesium reacting with molecules of oxygen to produce molecules of magnesium oxide?
Answer:
magnesium + oxygen = magnesium oxide
Explanation:
the word equation for molecules of magnesium reacting with molecules of oxygen to produce molecules of magnesium oxide is magnesium oxygen magnesium oxide.
What is a phase change that occurs when a solid transitions directly into a gas state without becoming a liquid?
A. sublimation
B. boiling
C. condensation
D. deposition
Explain the process of photosynthesis.
Answer:
During photosynthesis, plants take in carbon dioxide (CO2) and water (H2O) from the air and soil. This transforms the water into oxygen and the carbon dioxide into glucose. The plant then releases the oxygen back into the air, and stores energy within the glucose molecules.
Explanation:
Brainliest please
1. How would you describe a wave to someone
who has never seen one before?
Answer:
I would describe it as a amount of water that builds up and jumps up into the air and then splashes back down into the water like it was never there.
Explanation:
Based on this, which of the reactions below
are double-replacement reactions?
Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g)
2 AgNO3(aq) + Zn(8) + 2Ag(s) + Zn(NO3)2(aq)
Pb(NO3)2(aq) + 2KI(aq) + 2KNO3(aq) + Pb12(s)
BaCl2(aq) + Na2SO4 (aq) + BaSO4(s) + 2NaCl(aq)
Answer:
BaCl2(aq) + Na2SO4 (aq) → BaSO4(s) + 2NaCl(aq)
Explanation:
Chemical reactions are of different types namely; combination reaction, displacement reaction, double displacement reaction etc. Double displacement/replacement reaction is that reaction in which an exchange of ions occur between two reacting ionic compounds to form new products.
In this chemical reaction/equation;
BaCl2(aq) + Na2SO4 (aq) → BaSO4(s) + 2NaCl(aq)
2Cl- and SO42- are the ions exchanged in this reaction. Barium (Ba) displaces SO42-, while Sodium (Na) displaces 2Cl-, hence it is called DOUBLE DISPLACEMENT OR REPLACEMENT because the displacement involves two compounds/ions.
Sedimentary rocks form when broken bits of other rock are deposited and then –
Then... (What is the other part of the question...?)
Answer:
come together to form the new, sedimentary rock?
Explanation: