Volumes of ethanol and water are in the solution : 30 mL and 70 ml
Further explanationThe concentration of a substance can be expressed in several quantities such as moles, percent (%) weight/volume,), molarity, molality, parts per million (ppm) or mole fraction. The concentration shows the amount of solute in a unit of the amount of solvent.
Percent Volume (% v/v) : volume (ml) of solute/100 ml of solution ⇒ ratio of volume of the solute to total volume of the solution
[tex]\tt \%solute=\dfrac{solute~volume}{solution~volume}\times 100\%[/tex].
30% ethanol ⇒30% etanol, 70% water
In 100 mL solution :
[tex]\tt Ethanol=30\%\times 100~mL=30~mL\\\\Water=70\%\times 100~mL=70~ml[/tex]
I HAVE 5 minutes HELP!!
Which organelle accurately completes the chart?
O lysosome
O cell wall
O vacuole
O endoplasmic reticulum
Answer:
endoplasmic reticulum
Explanation:
Endoplasmic reticulum will complete the chart. The Endoplasmic reticulum is one type of organelle that is present in eukaryotic cells. They form a network that is interconnected with membrane-enclosed sacs or structures that are tube shaped and are called cisternae.
guys, how do i know whether the forces of attraction is strong or weak?
Answer:
Whether the forces of attraction is strong or weak is explained below in details.
Explanation:
There are three distinct kinds of intermolecular forces in expressions of energy. They are (strongest to weakest) dipole-dipole, hydrogen bonding, and Van der Waals' strengths. Intermolecular forces are weak related to intramolecular forces – the energies which endure a molecule collectively. For instance, the covalent bond, including distributing electron sets among atoms, is much more powerful than the forces impersonate among neighboring molecules.
En un recipiente cerrado a 25°C disponemos de un gas sometido a una presión de 250.000 Pa. Luego, sin que cambie el volumen, conseguimos una presión de 350.000 Pa. ¿a qué temperatura habremos tenido que calentar el gas?.
Answer:
El gas se calentó a 35°C
Explanation:
Para resolver este problema es necesario aplicar la Ley de Gay Lussac donde en una situación en la que un gas no modifica su volumen, su temperatura será directamente proporcional a la presión.
Podemos pensar que se describe desde la Ley de Gases Ideales donde:
P . V = n . R . T
para la situacion 1
y P . V = n . R . T para la situacion 2
Como V, n y R son constantes:
P₁ / T₁ = P₂ / T₂
250000 Pa / 25°C = 350000 Pa / T₂
T₂ = 350000 Pa . 25°C / 250000 Pa → 35°C
14. Which of the following involves a chemical change?
A.mixing
b. melting
grinding
d. decomposing
Answer:
D. decomposing
General Formulas and Concepts:
Chemistry
Chemical vs Physical ChangesExplanation:
A would be incorrect because mixing 2 things together doesn't necessarily create a chemical change. Take oil and water for example. You can mix the 2 and it would not have a chemical change.
B would be incorrect because you are simplify changing the state of matter of the object. Iron in solid form is still iron in liquid form; there is no chemical change.
C would be incorrect for similar reasons as B. You are simply changing the state of matter.
D would be the remaining and correct answer. Decomposing changes one object into a different one by chemically changing.
The element in group 4 and period 3
what is the momentum of a 3 kg bowling ball moving at 3 m/s
Answer:
9 kg.m/sExplanation:
The momentum of an object can be found by using the formula
momentum = mass × velocity
From the question we have
momentum = 3 × 3
We have the final answer as
9 kg.m/sHope this helps you
Examine the EM spectrum chart. Describe what is happening as the EM spectrum goes
from Radio Waves to Gamma rays,
Vight
Uno
Somme
Morowaves
Infrared
Radio Waves
Woman
w
w
Wavelength
The amplitude increases
The wavelength increases
The wavelength decreases
The amplitude decreases
Answer:
The wavelength decreases
Explanation:
As you go along the EM spectrum from radio waves to gamma rays, the wavelength decreases as the wave's energy and frequency increase.
Explain why heating a liquid causes it to evaporate more quickly.
Answer:
If a liquid is heated the particles are given more energy and move faster and faster expanding the liquid. The most energetic particles at the surface escape from the surface of the liquid as a vapour as it gets warmer. Liquids evaporate faster as they heat up and more particles have enough energy to break away.
Explanation:
what is the boiling point of carbon?
Answer: 3915 K (3642 °C, 6588 °F)
Answer:
8,721°F
OR
4,827°C.
Explanation:
Good Luck!
I will give you 100 points and mark you as brainilest if you answer the whole thing correctly.
Answer:
1.)[tex]Al_{2} O_{3}[/tex]
2.) [tex]Li_{3} N\\[/tex]
3.) 2HCl
4.) MgO
5.) Mg and [tex]O_{2}[/tex]
6.) [tex]H_{2}[/tex] and [tex]O_{2}[/tex]
7.)Na and [tex]Br_{2}[/tex]
8.) 3 aluminums and 3 chlorides
Explanation:
If a sample of air in a closed, rigid container was heated, would the partial pressure of oxygen increase, decrease or remain the same?
Answer:
increase
Explanation:
To solve this problem, you simply have to apply the Ideal Gas Law. Using this equation, we know that the pressure is directly proportional to the temperature. Thus, as something is heated (i.e. its temperature is increasing), its pressure would increase as well.
Which reverses the flow of current through an electric motor?
A brush
B battery
C armature
D commutator
Answer:
D
Commutator is the answer
Explanation:
The commutator systematically converts the current direction between the rotor and the outer circuit. As the shaft revolves, the commutator converts the course of current in a winding. For a separate armature winding, when a cylinder has reached one-half perfect turn, the winding is now attached so that current passes through it in the reverse of the original direction.
Answer:
D. Commutator
Explanation:
I just took the quiz. credit to the person above me.
Who was Alexander Fleming
Sir Alexander Fleming (6 August 1881 – 11 March 1955) was a Scottish physician and microbiologist, best known for discovering the enzyme lysozyme and the world's first broadly effective antibiotic substance which he named penicillin.
For this discovery he shared the Nobel Prize in Physiology or Medicine in 1945 with Howard Florey and Ernst Boris Chain.
he was a british doctor, born in august 6, 1881. he was also known as pharmacologist.
you can always search your question in goo, and you'll get a very short answer :)
Which statement is true about water's density and the survival of marine life? view attachment
In your own words, define the following terms.
1 Blood
2 Lymph
3 Alveoli
Answer:
BLOOD - the definition of blood is the fluid carries oxygen
Explanation:
sana po makatulong♡♡
If you put a piece of zinc into a solution of copper (I) sulfate and allow the single replacement reaction to go to completion, how will you know which of the reactants is the limiting reactant? Write the balanced equation, including the states of matter of the reactants and products, to help support your answer.
Explanation:
Reaction of zinc metal in copper sulfate solution.
[tex]\begin{array}{ll}\text { Oxidation : } & \mathrm{Zn}(s) \rightarrow \mathrm{Zn}^{2+}(a q)+2 e^{-}\\\text {Reduction : } & \mathrm{Cu}^{2+}(a q)+2 e^{-} \rightarrow \mathrm{Cu}(s) \\\hline \text { Full Reaction : } & \mathrm{Zn}(s)+\mathrm{Cu}^{2+}(a q) \rightarrow \mathrm{Zn}^{2+}(a q)+\mathrm{Cu}(s)\end{array}[/tex]
Zinc is listed above copper on the activity series, this means that zinc is more easily oxidized than copper. That is why copper(II) ions can act as an oxidizing agent when put into contact with zinc metal. Ions of any metal that is below zinc, such as lead or silver, would oxidize the zinc in a similar reaction.
Please select the word from the list that best fits the definition left standing after the collapse of a sea arch
Answer:
Sea Stack
Explanation: :)
Answer:
A
Explanation:
Nitrogen gas is cooled and its volume went
from 375 mL to 255 mL. If the final
temperature is -45 °C, what was the original
temperature?
A sample of water with a mass of 27.56g and an unknown temperature loses 2443 Joules. If the final temperature is found to be 62.50 C. What was the initial temperature?
Answer:
41.3 °C
Explanation:
From the question given above, the following data were obtained:
Mass (M) of water = 27.56 g
Heat (Q) loss = 2443 J
Final temperature (T2) = 62.5 °C
Initial temperature (T1) =?
NOTE: The specific heat capacity (C) of water is 4.18 J/g°C
Thus, we can obtain the initial temperature of the water by using the following formula:
Q = MC(T2 – T1)
2443 = 27.56 × 4.18 (62.5 – T1)
2443 = 115.2008 (62.5 – T1)
Divide both side by 115.2008
2443 / 115.2008 = (62.5 – T1)
21.20645 = 62.5 – T1
Collect like terms
21.20645 – 62.5 = – T1
– 41.3 = – T1
Divide both side by – 1
– 41.3 /– 1= – T1 / –1
41.3 = T1
T1 = 41.3 °C
Thus, the initial temperature of the water was 41.3 °C
What does one mole of oxygen and one mole of carbon dioxide have in common?
Answer:
Equal number of moles
Explanation:
Thats life
if hydrochloride tablets and MP4 format you find the attachment photograph and signature
answer is attached in the image below
Answerme espanol amigo me
Explanation:
Ms. Terries was given a beautiful deep red gem. She knew she might be holding a ruby. Or, she might be holding a stone worth more than rubies, a stone rared than diamonds – a red beryl. Ms. Terries needed to be careful in her calculations. Red Beryl is a mixture of minerals and its density can be anywhere from 2.63g/cm3 to 2.92 g/cm3 Rubies can also vary in density from 3.9 g/cm3 to 4.1 g/cm3. Ms. Terries weighed the stone. It weighed 4.35 g. When put into a graduated cylinder of water, the water level rose 1.5 mL. Determine the density of the gem. Was it ruby or red beryl?
Answer:
red beryl
Explanation:
Red Beryls = Density range is 2.63g/cm3 to 2.92 g/cm3
Rubies = Density Range is 3.9 g/cm3 to 4.1 g/cm3
Mass of stone = 4.35 g
Volume of solid = change in water level = 1.5 mL = 1 cm3
Relationship between mass, volume and density is given by;
Density = Mass / Volume
Density = 4.35 / 1.5 = 2.9 g/cm3
The density of the stone falls in the red beryls range hence it is a red beryl.
As you move down a group, you will recall that the radius increases. Why do you think an increase in atomic radius would result in a lower ionization energy?
Answer:
Because as we move down the group size/ radius of atom increases due to increase in shells and screening effect. The hold of nucleus on valence electrons decreases and effective nuclear charge decreases so it is easy to remove electron from greater sized atoms as compared to smaller sized aroms.
Energy required to remove electron is ionization energy so greater sized atoms have low ionization energy.
Explanation:
For which each question , which box do I mark?
Answer:
A
B
A
B
B
Explanation:
B - MIXTURE
A - COMPOUND
Isaac Newton lived and developed his Laws of Motion during which time period?
Answer:
saac Newton was a physicist and mathematician who developed the principles of modern physics, including the laws of motion and is credited as one of the great minds of the 17th-century Scientific Revolution.
Education: The King's School, University of Ca...
Birth Date: January 4, 1643
Death Date: March 31, 1727
Explanation:
Isaac Newton was a physicist and mathematician who developed the principles of modern physics, including the laws of motion and is credited as one of the great minds of the 17th-century Scientific Revolution.
hope it helps have a great day
what about solids ? Do solids move around like liquids and gases ?
Answer:
No, gases move freely all over the place, liquids move more freely but in a more contained area, and solids the molecules are rigid, at the most the movement is small vibration as the molecules put pressure on one another to hold their form and stay in place.
Which of the following correctly describes a proton? Group of answer choices Location: nucleus, contribution to mass: usually about half, charge: positive Location: nucleus, contribution to mass: virtually none, charge: positive Location: outside nucleus, contribution to mass: usually about half, charge: positive Location: nucleus, contribution to mass: usually about half, charge: none
Answer:
Location: nucleus, contribution to mass: usually about half, charge: positive
Explanation:
Protons are a part of the nuclear particles alongside the neutrons. Protons and neutrons are all together called sub-atomic particles and they share the nucleus at the center of an atom together.
Protons carry positive charges. They determine the mass of the atom alongside the neutrons. They contribute half to the mass of an atom and the other part is lies on the mass of a neutron. Neutrons do not carry any charges.Aluminum has the electronic configuration 2,8,3. How many valence
electrons are in the aluminum atom?
Answer:
3 valence electrons
Explanation:
Because aluminum has three, that means three fluorines can bond. The make the formula AlF3, also known as aluminum trifluoride. Each of the fluorine atoms gets an electron to fill their shell, and the aluminum loses three, giving it a filled shell too (remember, aluminum has three extra electrons).
Write the structure of the following compound:
=> 3-(4-chlorophenyl)-2-methylpropane
Answer:
See explanation and image attached
Explanation:
The IUPAC system of nomenclature enables the structure of molecules to be written seamlessly from the name of the compound. Hence it is commonly called the systematic nomenclature.
The parent chain here is propane. It is substituted at the 2- position by a methyl group and at the 3-position by 4-chlorophenyl group as we can see in the image attached to this answer.
Write your thoughts or ideas about the lesson on types of soil.
Answer:
There are different types of soil in the earth. Those different types of soil helps the earth stay healthy in many ways!! Just like the different layers in the earth. There are so many different layers in the earth so that the plants get the different nutrition they need. Not only that but it cleans the water that soaks in the ground.
There are 6 different types of soil, they are; sandy soil, clay soil, silt soil, peat soil, chalk soil, and loam soil.
Explanation:
Sandy soil
Sandy Soil is light, warm, dry and tend to be acidic and low in nutrients. Sandy soils are often known as light soils due to their high proportion of sand and little clay (clay weighs more than sand). These soils have quick water drainage and are easy to work with. They are quicker to warm up in spring than clay soils but tend to dry out in summer and suffer from low nutrients that are washed away by rain. The addition of organic matter can help give plants an additional boost of nutrients by improving the nutrient and water holding capacity of the soil.
Clay Soil
Clay Soil is a heavy soil type that benefits from high nutrients. Clay soils remain wet and cold in winter and dry out in summer. These soils are made of over 25 percent clay, and because of the spaces found between clay particles, clay soils hold a high amount of water. Because these soils drain slowly and take longer to warm up in summer, combined with drying out and cracking in summer, they can often test gardeners.
Silt Soil
Silt Soil is a light and moisture retentive soil type with a high fertility rating. As silt soils compromise of medium sized particles they are well drained and hold moisture well. As the particles are fine, they can be easily compacted and are prone to washing away with rain. By adding organic matter, the silt particles can be bound into more stable clumps.
Peat Soil
Peat soil is high in organic matter and retains a large amount of moisture. This type of soil is very rarely found in a garden and often imported into a garden to provide an optimum soil base for planting.
Chalk Soil
Chalk soil can be either light or heavy but always highly alkaline due to the calcium carbonate or lime within its structure. As these soils are alkaline they will not support the growth of ericaceous plants that require acidic soils to grow. If a chalky soil shows signs of visible white lumps then they can’t be acidified and gardeners should be resigned to only choose plants that prefer an alkaline soil.
Loam Soil
Loam soil is a mixture of sand, silt and clay that are combined to avoid the negative effects of each type. These soils are fertile, easy to work with and provide good drainage. Depending on their predominant composition they can be either sandy or clay loam. As the soils are a perfect balance of soil particles, they are considered to be a gardeners best friend, but still benefit from topping up with additional organic matter.
Those are the different types of soils with all of their many uses. I hope this helps!!!!! Have a wonderful day!!!