Answer:
S
Explanation:
Using periodic table (see those little numbers in the upper right? Those are electron 'shells' .... look at the bottom one)
Ca has 2 Cl has 7 Ne has 8 S has 6 in the outermost shell
Which part of the cell was most directly responsible for the shrunken appearance of the cell?
If a cell is placed in a hypertonic solution, water will leave the cell, and the cell will shrink.
What is osmosis ?
Osmosis is the net movement of water across a semipermeable membrane from an area of lower solute concentration to an area of higher solute concentration.
This may sound odd at first, since we usually talk about the diffusion of solutes that are dissolved in water, not about the movement of water itself.
If a cell is placed in a hypertonic solution, water will leave the cell, and the cell will shrink.
In an isotonic environment, there is no net water movement, so there is no change in the size of the cell.
When a cell is placed in a hypotonic environment, water will enter the cell, and the cell will swell.
Therefore If a cell is placed in a hypertonic solution, water will leave the cell, and the cell will shrink.
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Two children on roller skates stand facing each other. The child on the right puts her arms out and pushes away from her partner. What is the action and reaction
Answer:
They both go backward because of force.
Explanation:
The logic behind this answer is that child right and pushes away causing her to go backward meaning her partner is being pushed backwards to.
(Hope this was helpful!)
The
gas pressure in an oxygen tank is 3.90 atm at a
If temperature of 298 K. If the pressure decreases to 3.20 atm,
what is the temperature of the gas in kelvin?
Answer: …
Explanation:
Which option is a nonrenewable resource?
O at least some types of lumber
O solar energy
O oil
O wind
When auger is dissolved in heated water ___ is the solvent and ___ is the solute? A heat, water b water, heat c water, sugar d sugar, water
Answer C
Explanation: the solute will be sugar and the solvent will be water :)
Calculate the volume of 100. grams of oxygen gas (O₂) at 25.0°C and a pressure of 1.25 atm.
Ideal gas law states
PV = n(RT)V is volume (L), P is pressure (atm), R is universal gas constant: 0.0821 L·atm/mol· K, n is number of moles, T is temperature in Kelvin
Here given:
[tex]\blacksquare[/tex] mass of O₂ : 100 gram
[tex]\blacksquare[/tex] moles: mass/molar mass = 100/32 = 3.125 moles
[tex]\blacksquare[/tex] 25.0 °C = (25+273.15) = 298.15 K
[tex]\blacksquare[/tex] pressure: 1.25 atm
Volume:
[tex]\boxed{\sf V=\dfrac{nRT}{P}}[/tex]
[tex]\Rightarrow \sf V=\dfrac{(3.125 \ x \ 0.0821 \ x \ 298.15 )}{1.25}[/tex]
[tex]\Rightarrow \sf V=61.195 \ L[/tex]
[tex]\Rightarrow \sf V=61.2 \ L \ \ \ (rounded \ to \ nearest \ tenth)[/tex]
Additional Explanation:
Volume can be counted in multiple units.In Liters: 61.2 Liters
In cubic meter: 0.061163 m³
In cubic centimeter: 61,163.5 cm³
What is the formula for calculating the change in thermal energy?
Answer: :Change in thermal energy = mass x specific heat capacity x change in temperature.
Explanation: what it basically means is mass x heat x the change in temperature.
When a chemical reaction occurs, what happens
to the atoms of the two reactants
Name these compounds according to IUPAC. (ASAPP)
Propanal and acetone are the IUPAC names for the chemical.
What is the difference between propanal and acetones?Propanal, commonly known as propanaldehyde, is an aldehyde with one double bond and one oxygen atom.
Acetone is a ketone compound. R2CO is the functional group of ketones.
Thus, Propanal and acetone are the IUPAC names for the chemical.
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What kind of water is found in littoral zone of a lake?
The littoral zone of a lake is the area closest to the shore. It has very little biological activity but includes a lot of oxygen. The water in the lake's littoral zone is freshwater, free of living organisms such as plants and fish.
HELP PLEASE ASAP WILL MARK BRAINLIEST
what is the amount of heat required to raise the temperature of 200.0g of aluminum by 10C (specific heat of aluminum: 0.21 cal/g C)
a. 420 cal
b. 4200 cal
c. 42,000 cal
d. 420,000 cal
Please show calculations!
how many moles of O2 are needed to produce 3.95 moles of Fe2O3
Answer:
4Fe+3O2- 2Fe2O3
the ratio: 3:2
x:3.95
x=5.92 moles of O2
A helium balloon in a closed car occupies a volume of 2.32 L at 40.0oC. How many moles of helium would exert 5 atm of pressure at the ideal conditions above?
Answer:
.451 mole
Explanation:
PV = n RT R = gas constany = .082057 L-Atm/K-mol T is in units Kelvin
5 *2.32 = n (.082057)(40+273.15)
n=.451 mole
The stigma on the underside of the leaf allows________to move in and out of the leaf
Answer:
The stigma on the underside of the leaf allows Gas and Water Vapour to move in and out of the leaf
Use the drop-down menus to classify each of the following compounds.
HR: H
HH
H-C-C-O-C-C-H
H-C-C-
-C-C-H
A
H
RETRY
>
-H
>
HH Br
H-C-C-C-H
Answer:
ester, ether, haloalkane
Explanation:
EDG.2022
Describe the type of force which exists between particles in an Ideal gas. Explain why this type of force exists between the particles.
The Intermolecular force is a type of force which exists between particles in an Ideal gas.
What type of force which exists between particles in an Ideal gas?Intermolecular forces are considered weaker attractions that hold molecules in gas close together. This force of attraction is present between molecules or particles.
So we can conclude that the Intermolecular force is a type of force which exists between particles in an Ideal gas.
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trru or false
The atomic number for lithium is 17.
Answer:
False; the correct atomic number for lithuim is 3
Explanation:
Answer to back it up
~rere
What substances had lower thermal conductivity, metal,
wood, or plastic
Answer: plastic
Explanation:
The thermal conductivity of a material is highly depending on composition and structure. Generally speaking dense material such as medals and stone are good conductors of heat while load density substances such as gas and porous installations are poor conductors of heat
Answer:
Or plastic
Explanation:
May be useful................
Kiera and Grace are sisters. They both have blue eyes. Kiera is extremely short for her age and Grace is exceptionally tall for her age. Develop a hypothesis as to why the sisters have different statures. Justify your hypothesis in two or more complete sentences.
The hypothesis as to why the sisters have different statures occurs because from genetics we know that it is linked to the alleles so one sister is shorter than the other one was they had different alleles.
What is the genetic similarity between siblings?On average, siblings share about 50% of their DNA with each other, but some siblings share even more and some less. So while we all have approximately 50% DNA from each parent, the segments we end up getting are completely random.
Hereditary character or gene that is manifested by the absence of the opposite gene, called dominant, in this case, Kiera is extremely short for her age.
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how many grams of KNO3 can be dissolved in 100g of water at 80c
Answer:
As temperature increases, its solubility increases as well. Notice, however, that it does not increase significantly. In fact, you can expect to be able to dissolve no more than 40 g of sodium chloride per 100 g of water at 80∘C
Explanation:
As temperature increases, its solubility increases as well. Notice, however, that it does not increase significantly. In fact, you can expect to be able to dissolve no more than 40 g of sodium chloride per 100 g of water at 80∘C
PLEASE HELP
Which of the following best describes the work performed by a curator?
preservation
preservation
promotion
promotion
examination
examination
restoration
restoration
Answer:
A restoration
Explanation:
the action of returning something to a former owner, place, or condition.
If it's not preservation then it's it's reservation.
Which type of electromagnetic waves are dangerous enough to be used to kill cancerous cells?
gamma rays
visible light
infrared light
microwaves
Answer:
Gamma rays
Since they have high penetrating power.
Answer:
A
Explanation:
30. Which of the following substances would depress the freezing point of pure water the most?
a.
NaCl
c.
C6H12O6
b. MgCl₂
d.
K3PO4
Answer:
D. K3PO4
Explanation:
K3PO4 would dissolve into 3 potassium ions and one phosphate ions thus total of 4 items added in water. Freezing point is depressed by high amounts of stuff. NaCl would add 2 items (one Na and one Cl). Glucose would not break apart, thus 1 item. MgCl2 would break into One Mg and two Cl ions (thus 3 things.)..
Overall, K3PO4 dissolves into most components, thus would depress the freezin point most.
What is the density (g/L) of 5.0 moles of NH3, at 1.18 atm and 25.0°C?
Answer:
.821 g/L
Explanation:
It does not matter what the gas is, just the number of moles to calculate volume....
Ideal Gas Law :
PV = n R T R = gas constant = .082057 L-atm/(mol-K) & T in Kelvin units
(1.18)(V) = 5 * .082057 * (25 + 273.15)
V = 103.67 Liters
NOW ...to calculate density, the gas IS important...
mole weight of NH3 (from periodic table) = 17.031 gm/mole
Density = mass / volume = (5 * 17.031) / 103.67 L = .821 gm/L
for now pliss help me
Answer:
the nucleoid
Explanation:
a woman put her clothes in the dryer.There is a mix of wool and cotton. After the dryer is finished wool clothes and cotton clothes are stuck together. There's no wool stuck to wool or cotton stuck to cotton.using laws of charge, explain why this is the case
Answer:
Explanation:
Explanation
There is a Plus charge on one of them (I think it is likely the wool).
There is a minus charge on the other one (So it is cotton most likely.
The point is that like charges repel (move away from each other)
Unlike charges attract. (move close to each other.)
You have a case of unlike charges attracting.
Compare the properties of the four state of matter in terms of particle arrangement, particle motion, shape,
size, and compressibility
Solid-
shape-retains a fixed volume and shapenot easily compressibledoes not flow easily , Particles in a solid are tightly packed, usually in a regular pattern. Particles in a solid vibrate (jiggle) but generally do not move from place to place.liquid-
shape-assumes the shape of the part of the container which it occupiesnot easily compressibleParticles in a liquid are close together with no regular arrangement. Particles in a liquid vibrate, move about, and slide past each other.Gas-
shape-assumes the shape and volume of its containercompressibleParticles in a gas are well separated with no regular arrangement. Particles in a gas vibrate and move freely at high speeds.Plasma-
shape-variable volume and shapePlasma is slightly different from the other phases of matter, in that the high temperatures cause the atoms/particles to break apart into electrons and nuclei. This mixture of electrons and nuclei act similarly to gas particles, moving freely and have no distinct arrangement.Consider the balanced equation. 2hcl mg right arrow. mgcl2 h2 if 40.0 g of hcl react with an excess of magnesium metal, what is the theoretical yield of hydrogen? 1.11 g 2.22 g 52.2 g 104 g
Answer:
1.11 g
Explanation:
From the answer you're given that HCl is the limiting reactant.
Mg + 2HCl -> MgCl2 + H2
40.0 g
First of all you want to know the moles of HCl you actually have:
40.0 g HCl x [tex]\frac{1 moles of HCl}{36.45 g/mol}[/tex] = 1.09739 moles of HCl.
Where 36.45 is the molar mass of H (1.008) + Cl (35.45).
Since the limiting reactant is HCl you'll have to discover how much H2 is produced from the limited quantity of reactant you have:
1.09739 moles of HCl x [tex]\frac{1 moles of H2}{2 moles of HCl}[/tex] = 0.54869 moles of H2 is produced
Now you have to simply convert the moles of H2 in grams:
0.54869 moles of H2 x 2.016 g/mol H2 = 1.106 g
Where 2.016 is the molar mass of H2.
Theoretical yield of hydrogen atom is produced in 2Hcl mg , mgcl₂ and h₂ if 40.0 g of Hcl react with an excess of magnesium is 1.096 moles.
What is molarity ?Molarity (M) is the amount of a substance in a certain volume of solution. Molarity is defined as the moles of a solute per liters of a solution. Molarity is also known as the molar concentration of a solution.
Theoretical yield of hydrogen atom is calculated by using mass amd molar mass of an atom.
2Hcl + mg---> MgCl₂ + H₂
The theoretical yield of hydrogen is calculated as follows
mass/molar mass
40 ÷ 36.5 = 1.096 moles
by use of mole ratio of Hcl to H2 which is 2:1
moles of H2 = 1.096 ÷ 2 = 0.548moles
mass is therefore = moles x molar mass
that is 0.548moles x 2 = 1.096 grams
Hence, the theoretical yield of hydrogen atom is 1.096 grams.
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I answered all of the previous questions, but I'm not sure I understand questions 4 and 5, so I'm hoping you can assist me.
What is the OH- in a solution with a pOH of 7.68?
Answer:
Explanation:
Answer: 1.380 × 10^-8 M
The pH is the measure of alkalinity or acidity of a substance.
It is the negative logarithm of H+ ions concentration [H+].
pH = -log[H+]
pOH on the other hand is negative logarith of OH- concentration [OH-].
pOH = -log[OH-]
In this case;
pOH = 7.86
We can calculate the [OH-]
pOH = -log[OH-]
But, pOH = 7.86
pOH = -log[OH-]
-log[OH-] = 7.86
[OH-] = Antilog -7.86
= 1.380 × 10^-8 M
Therefore, [OH-] is 1.380 × 10^-8 M
