The volume percentage of 18 L of isopropanol in 45 L of water is 28.57%
Total solution = volume of water + volume of isopropanol
Total solution = 18L + 45L
Total solution = 63L
Volume of isopropanol = 18L
% volume of 18L isopropanol = 18/63 * 100
% volume of 18L isopropanol = 1800/63
% volume of 18L isopropanol = 28.57%
Hence the volume percentage of 18 L of isopropanol in 45 L of water is 28.57%
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A solution is prepared by dissolving 30. g of KNO3 into 100. mL of total solution. What is the molarity of this solution?
Answer:
3.0 M
Explanation:
The molarity formula is M = n/v
where M is the molarity, n is the number of moles, and v is the volume in litres.
step 1: convert the grams of KNo3 to moles. To convert grams to moles, divide by the molar mass.
(30 g divided by 101.103 g/mol) = 0.296 moles
step 2: convert the volumes to Litres. 100 mL is 0.1 L
step 3: apply the formula. Molarity = (0.296 mol / 0.1 L) = 2.96 mol/L
We will round our answer to 3.0 M
A column is run with hexane first, then a hexane/ dichloromethane mixture, then 100% dichloromethane. What will happen is you mix up the hexane and dichloromethane i.e. ran the dichloromethane first?
If hexane and dichloromethane are being mixed up together i.e if dichloromethane is added first, the impurities will mix together and it will be difficult and unable to separate.
Hexane and dichloromethane are two different solvents with different properties used in column chromatography. While hexane is polar in nature dichloromethane occurs to be a non-polar solvent.
The best way to run this process in the column is to first add hexane, followed by gradual addition of dichloromethane. This will help to separate and distinguish each compound in the mixture.
However, if dichloromethane is added first, the compound will get eluted and there wlll be no separation. The only solution will be to evaporate the solvent and run the column once again with the steps explained above.
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Which option is a list of elements arranged by decreasing malleability?
OS, Mg, B
Mg, B, S S
OS, B,
S, B, Mg
OB, Mg, S
BS
Answer:
I think it's the second option
Explanation:
I'm just taking a stab in the dark here, so to speak
where is the answers?>???!!!!
Answer:
Explanation:
For what?
Describe combination chemical reaction
1. Combination between two elements :
2H2(g) + O2(g)⸻➤2H2O(l)
N2(g) + 3H2⸻➤2NH3(g)
C(s) + O2(g) ⸻➤CO2(g)
The combination reactions as shown in which a new compound is formed from its constituent elements are also called synthesis reactions.
2. Combination between two compounds-
CaO(s)+ H2O(l)⸻➤Ca(OH)2(aq)+ heat
quicklime⠀⠀⠀⠀⠀slakedlime
3. Combination between an element and a compound :
2CO(g)+O2(g) ⸻➤2CO2(g)
2NO(g) + O2(g) ⸻➤2NO2(g)
hogwarts school of wizardry
Answer:
Very good :)
Explanation:
1.0 g of H_{2}O_{2} solution (30 wt%) was titrated with 29.29 mL of KMnO_{4} solution. What is the molarity of the KMnO_{4} solution
1.0 g of 30 wt% H₂O₂ is used to titrate 29.29 mL of 0.20 M KMnO₄ solution.
Let's consider the balanced equation for the reaction between H₂O₂ and KMnO₄.
2 KMnO₄ + 3 H₂O₂ → 3 O₂ + 2 MnO₂ + 2 KOH + 2 H₂O
1.0 g of H₂O₂ solution react. We can calculate the reacting moles of KMnO₄ considering that:
The concentration of H₂O₂ is 30 wt%.The molar mass of H₂O₂ is 34.01 g/mol.The molar ratio of H₂O₂ to KMnO₄ is 3:2.[tex]1.0gH_2O_2(Solution) \times \frac{30gH_2O_2}{100gH_2O_2(Solution)} \times \frac{1molH_2O_2}{34.01gH_2O_2} \times \frac{2molKMnO_4}{3molH_2O_2} = 0.0059molKMnO_4[/tex]
0.0059 moles of KMnO₄ are in 29.29 mL of solution. The molarity of KMnO₄ is:
[tex][KMnO_4] = \frac{0.0059mol}{0.02929 L} = 0.20 M[/tex]
1.0 g of 30 wt% H₂O₂ is used to titrate 29.29 mL of 0.20 M KMnO₄ solution.
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What is the mass number
Answer:
the total number of protons and neutrons in a nucleus.
The mass number, also called atomic mass number or nucleon number, is the total number of protons and neutrons in an atomic nucleus. It is approximately equal to the atomic mass of the atom expressed in atomic mass units.
Students in science are studying solutions and the dissolving rate of solids. One group was given some instant lemonade mix to
dissolve. They used a packet of lemonade crystals and a packet of lemonade powder. The students dissolved the same amount of
each solid into 100 ml of water. They varied the water temperature. List ALL the possible conclusions based the data the students
collected?
A)Lemonade crystals are more soluble than lemonade powder
Eliminate
B)The greater the surface area, the powder, the more readily the solid dissolves.
C)As the water temperature increases, the dissolving rate for both solutes
increases
D)Stirring the solution increased the rate dissolving for both crystals and
powder.
E)Lemonade powder dissolved twice as fast as lemonade crystals, regardless of water temperature.
Answer: B and C
Explanation:usatestprep
The solubility of a substance depends on both physical and chemical properties of that substance. Here the greater the surface area, the powder, the more readily the solid dissolves and also increases with the temperature. The correct options are B and C.
The maximum amount of the solute which can dissolve in a known quantity of the solvent at a certain temperature is defined as the solubility. The rate of dissolving depends on the surface area, temperature and the amount of stirring.
The increase in the surface area of the solute and temperature increases the rate of dissolving.
Thus the correct conclusions are B and C.
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#SPJ2
I need help please I
bobbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
What is changed about a rock
during mechanical weathering?
Answer: Mechanical weathering (also called physical weathering) breaks rock into smaller pieces.
Explanation: That means the rock has changed physically without changing its composition.
When using acids and bases, note that these substances are Choose... . Make every effort to avoid contact with Choose... . Be sure to wipe up any spills Choose... .
Answer:
When using acids and bases, note that these substances are
corrosive
. Make every effort to avoid contact with
the skin and lab surfaces
. Be sure to wipe up any spills immediately
Explanation:
When using acids and bases, note that these substances are corrosive. Make every effort to avoid contact with the skin and lab surfaces. Be sure to wipe up any spills immediately.
What are acids and bases?An acid is any hydrogen-containing substance that is capable of donating a proton (hydrogen ion) to another substance.
A base is a molecule or ion able to accept a hydrogen ion from an acid.
Acids and bases are corrosive in nature, they give a burning sensation when it comes in contact with skin, so handle this substance with care.
Due to their corrosive nature, Make every effort to avoid contact with the skin and lab surfaces.
Acid spills should be neutralized with sodium bicarbonate and then cleaned up with a paper towel or sponge. Do not use a strong base, such as sodium hydroxide, to neutralize a strong acid like hydrochloric acid.
Acids and bases neutralize each other, forming salt and water. A strong acid-strong base neutralization results in a neutral solution with a pH of 7.
Therefore, When using acids and bases, note that these substances are corrosive. Make every effort to avoid contact with the skin and lab surfaces. Be sure to wipe up any spills immediately.
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What is the mass of 4.2 moles of carbon?
Answer:12.01
Explanation:
A marine fossil found in a desert indicates that the area had once been water. I have to type this answer
Answer:
whats the question
Explanation:
How are the electron structures of carbon (C) and oxygen (0) similar?
The Periodic Table
A. The highest sublevel is the 2s sublevel.
B. They both have 2 valence electrons.
C. They both have valence electrons in the 2p sublevel.
D. They both have valence electrons in the first main energy level.
Answer:
It's been a long while since I've done this but
Explanation:
I think the answer is D. They both have valence electrons in the first main energy level Carbon atoms are made up of 6 protons, 6 electrons, and 6 neutrons, whereas Oxygen atoms are made of 8 protons, 8 neutrons, and 8 electrons.
I might be very wrong..
HELP 100 PONTS GIVING BRAINLIEST
Answer:
Didn’t give me a picture m8???
Answer:
i need pictres to solve
Explanation:
Chemical Formula NH3 Element Element 1 Element 2 Element 3 Color 1 Color 2 Color 3
Answer:
Ammonia | NH3 or H3N | CID 222 - structure, chemical names, physical and chemical ... Ammonia, 0.5M solution in 1,4-dioxane, AcroSeal(R) ... 3.2.2Color/Form.
Explanation:
The chemical formula for ammonia is NH3. It has many names including hydrogen nitride, Nitrosil, and Vaporole. Its molar mass is 17.0306 g/mol[1]. Ammonia has a Page 3 strong pungent odor.
When you listen to the voices while in the room, they sound different than listening to them through the wall.
Why do the voices sound different when you listen to them through the wall?
Question 11 options:
Sound waves change frequency over long distances
Sound waves do not pass through solid materials
Your ear processes sound differently when it goes through a solid.
Sound waves travel at different speeds when traveling through different materials
Sound waves travel at different speeds when traveling through different materials because sound has different speeds in different media.
Sound is a type of wave that is propagated in compression and rare factions. When sound is propagated, it produces a sensation when it impinges on the ears.
The speed of sound through various media is different. The difference in the speed of sound in various media results in the fact that sound waves travel at different speeds when traveling through different materials.
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Which pair of atoms most likely would form an ionic bond?
Ca and Sr
C and O
K and Br
Answer:
K and Br
Explanation:
K and Br would form an ionic bond because K (potassium) is a metal and Br (bromine) is a nonmetal. Ionic bonds are created between metals and nonmetals.
Why do we fill aluminum cans with liquids (soda) then put them in the refrigerator
Answer:
hello hi what's up
Explanation:
ok bye
Answer:
to make it cold
Explanation:
PLS HELP!!!!
A system does 566 kJ of work and loses 216 kJ of heat to the surroundings.
What is the change in internal energy, Δ , of the system? Note that internal energy is symbolized as Δ in some sources.
Answer:
let a real person help u...
The change in internal energy of the system = -772kJ
Explanation:
Heat lost by the system , a = -266KJ
Workdone by the system, W = -506KJ
The first law of thermodynamics states that:
Change in internal energy = q + w
Substituting values into the equation
Change in internal energy = (-266KJ) + (-506KJ)
Change in internal energy = -722KJ
Calculate [Hg2 2+] in a saturated solution of mercury (I) chloride (Ksp= 1.5x10^-18)
Answer:
2NaI(aq)+Hg2(C2H3O2)2(aq)→2NaC2H3O2(aq)+Hg2I2(s)
Explanation:
How many moles are in 1.30 x 10^8 g of HCIO?
Answer:
Explanation:
Find 1 mole of HClO
1*h = 1Cl = 35.5O = 161 mol HClO = 52.5 grams
Set up a proportion
1 mol / 52.5 = x / 1.30 * 10^8 Cross multiply
52.5 * x = 1.30 * 10^8 Divide by 52.5
x = 1.30 * 10^8 / 52.5
x = 2.476 * 10 ^6 moles
2ZnSO4
Is that name of element # of atoms? Total of atoms? The #4 is a (coefficient or subscript?
Using the photo, solve the world scramble to answer the question: What happens to Ice as it heats up? T I G A C N S E H E A S T T
Answer:
hi
Explanation:
hi
Answer:
When heat (a form of energy) is added, the ice melts into liquid water. It has reached its melting point – 0°C. Continue to apply heat, and the water will turn into water vapour, which is water in its gaseous state.
When ice is heated, it will melt into the liquid state of water. This change is called melting. Melting of ice is a reversible change as we can again obtain ice by freezing the melted water.
how can increase the rate of the preparation copper i iodide?
Answer:
Preparation. Copper(I) iodide can be prepared by heating iodine and copper in concentrated hydriodic acid, HI. In the laboratory however, copper(I) iodide is prepared by simply mixing an aqueous solution of potassium iodide and a soluble copper(II) salt such copper sulfate.
What might an inclined plane be used for?
А
holding objects together
B
splitting an object apart
с
raising and lowering objects
D
moving an object along the ground
Answer:
c. rising and lowering objects
TACCGACAACACATT
Original DNA sequence
Answer:
ATGGCTGTTGTGTAA
Explanation:
Help a friend here,,how to describe the lifecycle of a moss plant..
check the image i sent you.
How do you explain the relationship between brightness and concentration of salt?
The relationship between brightness and salt concentration is a direct
relationship.
Brightness and salt concentration having a direct relationship means that as
the salt concentration increases, the brightness increases and vice versa.
This system contains two electrodes and salt water which serves as the
electrolytes.
The salt water which contains sodium and chlorine ions flow between both
ends thereby generating the electricity in the system.
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