Answer:
At standard room temperature, [tex][{\rm OH^{-}] \approx 2.5 \times 10^{-7}\; \rm M[/tex] when [tex][{\rm H^{+}] = 4.0 \times 10^{-8}\; \rm M[/tex].
Explanation:
The following equilibrium goes on in water:
[tex]{\rm H_{2}O}\, (l) \rightleftharpoons {\rm H^{+}}\, (aq) + {\rm OH^{-}}\, (aq)[/tex].
The forward reaction is known as the self-ionization of water. The ionization constant of water, [tex]K_{\rm w}[/tex], gives the equilibrium position of this reaction:
[tex]K_{\rm w} = [{\rm H^{+}] \cdot [{\rm OH^{-}}][/tex].
At standard room temperature ([tex]25\; {\rm ^{\circ}C}[/tex]), [tex]K_{\rm w} \approx 10^{-14}[/tex]. Also, [tex][{\rm H^{+}}] = 4.0 \times 10^{-8}\; \rm mol \cdot L^{-1}[/tex]. Substitute both values into the equation and solve for [tex][{\rm OH^{-}}][/tex].
[tex]\begin{aligned} {[}{\rm OH^{-}}{]} &= \frac{K_{\rm w}}{[{\rm H^{+}}]} \\ &\approx \frac{10^{-14}}{4.0 \times 10^{-8}} = 2.5 \times 10^{-7}\end{aligned}[/tex].
In other words, in an aqueous solution at standard room temperature, [tex][{\rm OH^{-}] \approx 2.5 \times 10^{-7}\; \rm M[/tex] when [tex][{\rm H^{+}] = 4.0 \times 10^{-8}\; \rm M[/tex].
What is 1.0 x 10^4 L in nL?
Answer:
= 10000000000000 Nanoliters
Explanation:
1.0 x (10^4) L =
10 000 L
10 000L converted into Nanoliters
= 10000000000000 Nanoliters
Hope this helps
The birdseed above is a mixture of several different types of sizes of seeds. Is the mixture a…
A) homogeneous
B) heterogeneous
Answer:
Answer B: Heterogeneous
Explanation:
im pretty sure this is it if its not im really sorry
please help me with my question
C2H2OH is the answer
I am not sure but I think
Is soapy water water good for plant irrigation (give answer in accordance to chemistry)?
Answer:
soapy water is not good for plants irrigation that is what I learn
Answer:
Soapy water is not good for plant irrigation because soapy water contains sulphate in it which is not good for the development of plants.
Explanation:
hope this helps
CCC Systems and System Models Liquid gallium changes to a gas at 2229°C.
Describe how a model of gaseous gallium would compare to the model of liquid
gallium shown in the picture.
Gaseous gallium will consist of atoms separated from each other by a large distance and do not experience inter-particle attractive forces.
There are three states of matter;
SolidLiquidGasMatter can exist in all these states of matter depending on the extent of inter-particle attractive forces in the substance.
Inter-particle attractive forces are strongest in solids hence they have a definite shape and volume and do not flow.
Liquids have weaker inter-particle attractive forces than solids hence liquid particles can flow. Liquids have a definite volume but not a definite shape.
Gases have almost no inter-particle attractive forces between particles hence gas particles are separated by large distances and move at very high velocities. A gas does not have definite shape or volume.
A model of gaseous gallium will show atoms of gallium separated by large distances and do not experience inter-particle attraction.
A model of gas particles is shown in the image attached to this answer.
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oops i dont think i meant to do this
How to solve this? Pls help!!
8 points
A tennis ball is thrown straight up with an initial velocity of 5 m/s (vi = 5
m/s). At the highest position, the velocity is O m/s (vf = 0 m/s). How high
does the ball rise? *
O 1m
1.3m
5m
25m
Answer:
1.3 meters
Explanation: use newton third law equation.
The observed mass of the sun is 6.270 * 10 ^ 26 g but the actual mass of sun is 5.97*10^ 24 kg . The percent error in measurement is 4,78 %
Answer:
False hoge iska answer
Explanation:
Please follow me
What is a mixture?
A.
two or more substances combined
B.
when a chemical reaction occurs and new
substances are formed
Answer:
A. two or more substances combinedExplanation:
As,
Mixture defines two or more substances that are physically combined with each other and are formed as solutions, suspension, and colloids
Which statement accurately describes test tubes and beakers?
A.Beakers and test tubes both have rounded bottoms.
B.Test tubes are better for transferring liquids than beakers.
C.Beakers have liquid volume (mL) markings on the side of them; test tubes are unmarked.
D.Beakers can be held over a flame; test tubes cannot.
Beakers are flat bottom laboratory glassware that can be used to hold liquid in the laboratory. A test tube is a laboratory glassware that is unmarked and can be used to heat a liquid over a flame.
The correct answer is option C: Beakers have liquid volume (mL) markings on the side of them; test tubes are unmarked.
Several glassware are very useful in the laboratory especially when dealing with liquids.
Two among these important glassware are beakers and test tubes. A beaker is mostly used to hold liquids while a test tube is used to both hold and heat liquids if need be during a laboratory experiment.
Beakers are graduated by the side while test tubes are unmarked.
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Use the word stable to explain why the alkali metals tend to lose 1 valence electron.
Answer:
becoz vvv is always with you
Answer:
Alkali metals have one valence electron on their outer shell. They are more stable when they have eight valence electrons so they tend to loose that one electron and obtain a full octet, therefore become stable
35. A line graph uses_ on the x-axis
a. categories
b. time
C. dependent variable
d. control group
Which has the strongest intermolecular forces?
A B C or D
Answer:
A
Explanation:
What is the formula mass of a compound with 2 aluminum atoms and 3 oxygen atoms?
Answer:
[tex]\boxed {\boxed {\sf 101.96 \ amu}}[/tex]
Explanation:
Formula mass is the sum of the atomic masses of the atoms in a molecule. Essentially, it is the mass of 1 molecule of a compound.
We are given a compound containing 2 aluminum atoms and 3 oxygen atoms. We will use the Periodic Table to look up the atomic masses of the 2 elements in the compound.
Al: 26.981538 amuO: 15.999 amuThese are the atomic masses of 1 atom of the element. Remember we have 2 Al atoms and 3 O atoms. We multiply the element's atomic mass by the number of atoms of that element in the compound.
2 Al: 26.981538 amu *2= 53.963076 amu 3 O: 15.999 amu * 3=47.997 amuNow we add the atomic mass of 2 Al atoms and 3 O atoms.
53.963076 amu + 47.997 amu = 101.960076 amuWe may want to round this answer to the hundredth place. The 0 in the thousandth place tells us to leave the 6 in the hundredth place.
101.96 amuThe formula mass of a compound with 2 aluminum atoms and 3 oxygen atoms is approximately 101.96 atomic mass units.
A gas has a density of 5.56 g/L. What would the mass in kilograms of 1 m^3 of this gas
Answer:
Mass is 5560 grams
Explanation:
[tex]{ \boxed{mass = density \times volume}}[/tex]
Density is 5.56 g/L
Volume is 1 m³ = 1,000 L
Substitute the following to get mass:
[tex]mass = (5.56 \times 1000) \\ { \boxed{ \boxed{mass = 5560 \: grams}}}[/tex]
Which phrase is the best definition of matter?
A. The amount of physical material in an object
B. Anything that takes up space and has mass
C. Anything that can be measured
D. A particle made up of two or more atoms
SUE
The amount of physical material in an object
Which part of John Dalton’s theory was disproved by J.J. Thomson’s cathode-ray tube experiments?(1 point)
Atoms can form new substances.
Atoms are indivisible.
Atoms are small.
Atoms can join together.
The part of John Dalton’s theory was disproved by J.J. Thomson’s cathode-ray tube experiments is; "Atoms are indivisible".
One of the major postulates of the Dalton's atomic theory is that the atoms of elements are "indivisible".
This idea resounds from the earliest ideas of Greek philosophers concerning the atom.
Through the cathode-ray tube experiments, J.J. Thomson discovered sub-atomic particles.
This nullified the idea that atoms are indivisible.
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What is the function of a vacuole?
A) Thick solution that fits all cells
B) Stores food, water, and waster
C) transports proteins
D) helps with cell division
Answer:
B stores food, water and waster
First one to answer will be marked as brainliast
If 180 grams of sugar can be dissolve in 100 milliliters of water to make a saturated solution of sugar at room temperature, how much sugar is needed to make a saturated solution of sugar in 250 ml of water, if it already contains 200 grams of sugar dissolved as an unsaturated solution
Answer:
130 gram
Explanation:
first subtract 180 to 100
then the answer is 80
now add 80 to 250
the answer is 330
lastly subtract 330 with 250
the final answer is 130
A material that resists changes in shape and volume would be
A. solid
B. liquid
C. gas
D. plasma
Answer:
solids
Explanation:
solids aren't very malleable of prone to change shape and/or volume so...
The diffrences between wood and stone
Wood:
Wood comes from trees, that are growing out of the ground, but not TECHNICALLY part of the earth.
Stone:
Stone is a part of the earth, created by a lot of minerals combining, and molten rock hardening a LOOOOOOONG time ago.
Describe the process of making the four major macromolecules.
Answer:
Proteins, carbohydrates, nucleic acids, and lipids are the four major classes of biological macromolecules—large molecules necessary for life that are built from smaller organic molecules. Macromolecules are made up of single units known as monomers that are joined by covalent bonds to form larger polymers.
Explanation:
Have a great day!
Answer:, , nucleic acids, and lipids are the four major classes of biological macromolecules—large molecules necessary for life that are built from smaller organic molecules. Macromolecules are made up of single units known as monomers that are joined by covalent bonds to form larger polymers. I forgot to add carbohydrates and proteins also my bad
i just started learning aboit this too
Explanation:
What did the Aboriginal people use to weave dilly bags?
Answer:
This bag has been made from introduced materials, but before foreign fibres were used dilly bags were made from bark, leaves, stems, roots, human hair, animal fur and animal sinew.
Why is ice melting considered to be a PHYSICAL change?
A. the water molecules do not change chemically and are still H2O
B. the water molecules change into new chemicals and are no longer H2O
C. They are chemically mixed and won’t for H2O
D. They will just be the same liquid (already did this and it wasn’t it)
Answer:
A. the water molecules do not change chemically and are still H2O
Explanation:
The arrangement of molecules is the only change that occurs
[tex].[/tex]
Which of the following correctly
describes a physical change in
matter?
A. matter keeps its chemical makeup, but a
change in size, shape, volume, or state of matter
occurs
B. particles leave and a new substance is made
C. a new substance is formed by atoms
combining in different ways
Answer:
the option A is right matter keeps it's chemical makeup like size shape volume and state
what happens when an object in space revolves
Answer:
Objects in space follow the laws or rules of physics, just like objects on Earth do. Things in space have inertia. ... The movement of things in space is influenced by gravity. Gravity is an important force that can change the course of bodies in space or pull them off of one course, or even cause them to crash together.
Explanation:
i Hope This Helps :3
Answer: It is Turing on an axis, in a 360* motion. OR, since you didn’t specify, it could be revolving around the sun, meaning it is traveling around the sun once.
What would happen if you poured gasoline into water? *
the gasoline would float on top of the water
the water would float on top of the gasoline
the gasoline would be suspended in the middle of the water
the water would be suspended in the middle of the gasoline
9. A 35.2-mL, 1.66 M KMnO4 solution is mixed with 16.7 mL of 0.892 M KMnO4 solution. Calculate the concentration of the final solution.
Answer:
I think that the answer is 0.79M
van dar waals are the dominant molecular force in the sodium chloride.
Answer:
Recall the two conceptual steps necessary to dissolve a solute and form a solution
Key Points
There are two conceptual steps to form a solution, each corresponding to one of the two opposing forces that dictate solubility.
The first conceptual step is dissolution, which corresponds to the force of the solvent-solvent and solute-solute intermolecular attractions that needs to be broken down.
The second conceptual step is solvation, which corresponds to the force of the solute-solvent intermolecular attraction that needs to be formed in order to form a solution.
Many intermolecular forces can contribute to solvation, including hydrogen bonding, dipole-dipole forces, Van Der Waals forces, and ion-dipole interactions.
Term
intermolecular forcesattractive and repulsive forces between molecules
The strength of the intermolecular forces between solutes and solvents determines the solubility of a given solute in a given solvent. In order to form a solution, the solute must be surrounded, or solvated, by the solvent. Solutes successfully dissolve into solvents when solute-solvent bonds are stronger than either solute-solute bonds or solvent-solvent bonds.
Qualitatively, one can determine the solubility of a solute in a solvent by using the rule “like dissolves like”. In general, solutes whose polarity matches that of the solvent will generally be soluble. For example, table salt (NaCl) dissolves easily into water (H2O) because both molecules are polar.
Intermolecular Forces and Their Importance in Solution Formation
There are two conceptual steps to form a solution, each corresponding to one of the two opposing forces that dictate solubility. If the solute is a solid or liquid, it must first be dispersed — that is, its molecular units must be pulled apart. This requires energy, and so this step always works against solution formation (always endothermic, or requires that energy be put into the system).
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