Answer:
Sodium fluoride (NaF) does indeed follow the octet rule without any violations.
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
When a chemical reaction occurs, what happens
to the atoms of the two reactants
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.
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 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................
The radioactive decay of Uranium-238 releases alphas particles and results in a mass change of 0.135 g. Determine the amount of energy released by this reaction
a) 1.22 x 10^13J
b) 1.22 x 10^16J
c) 4.05 x 10^4J
d) 4.05 x 10^7J
This question involves the concept of binding energy.
The amount of energy released by this reaction is "a) 1.22 x 10¹³ m/s".
What amount of energy is released?The amount of energy that is released during the radioactive decay of any element is known as binding energy. This can be given by using the following formula:
[tex]E=\Delta mc^2[/tex]
where,
E = energy released = ?Δm = mass change = 0.135 g = 1.35 x 10⁻⁴ kgc = speed of light = 3 x 10⁸ m/sTherefore,
E = (1.35 x 10⁻⁴ kg)(3 x 10⁸ m/s)²
E = 1.22 x 10¹³ m/s
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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!
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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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
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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What is the compound N₂O called?
Answer:
I believe its preferred to as "Laughing Gas." It's also called, Nitrous Oxide.
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
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
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:
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.
for now pliss help me
Answer:
the nucleoid
Explanation:
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 :)
A student mixed two chemicals to allow them to
react. The temperature before the reaction was 25
°C. The temperature after the reaction was 50° C.
Which of the following is true?
A. there was no change in heat energy
B. it is an exothermic reaction
help plsssss
Answer:
B .it is an exothermic reaction
Explanation:
i need brainleyest
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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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
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.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.
Which option is a nonrenewable resource?
O at least some types of lumber
O solar energy
O oil
O wind
Four patients have been diagnosed with medical issues. A 2-column table with 4 rows. The first column labeled Patient has entries Josh, Ashley, Ron, Lindsay. The second column labeled Issue has entries sprained finger, pregnant with an under developed fetus, kidney stones, cancer in the tissues lining the uterus. Which patients could be best helped using ultrasound technology? Josh, Ashley, and Lindsay Josh Ron Ashley, Ron, and Lindsay
Answer:
Ashley, Ron, and Lindsay
Explanation:
Ultrasound technology is used for medical purposes by a scanning machine that allows to obtain living images of the inside of the body. For the type of issues they are going trough, ultrasound technology would help patients Ashley, Ron, and Lindsay. Ashley's under-developing fetus, Ron's kidney stones and, Lindsay's uterus cancer can be monitored by using ultrasound technology.
The ultrasound technology is a medical tool which can help a physician to evaluate, diagnose and treat medical conditions. Here the patients with Ron, and Lindsay kidney stones and cancer can be detected by ultrasound technology. The correct option is D.
What is cancer?A term for the disease in which the abnormal cells divide without control and can invade nearby tissues is defined as cancer. The cancer cells can also spread to the other parts of the body through the blood and lymph systems.
Kidney stones are the hard deposits made of minerals and salts which form inside our kidneys. It is mainly caused due to little drinking of water, obesity, eating food with high salt or sugar content.
The ultrasound technology can detect cysts, tumors, obstructions or infections within or around your kidneys. It is also used by the medical professionals for many purposes including the pregnancy related problems.
Thus the correct option is D.
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- CH₂ - CH₂ - CH₂
–
2
3
I
CH₂
CH₂-CH₂
CH₂
O 2,3-dimethylpentane
O2-methyl-3-methylpentane
O2,3-methylpentane
O 2-methyl-3-ethylbutane
Answer:
2,3-dimethyl pentane.........
The specific heat capacity of water is 4.184 J/gC. The specific heat capacity for ethanol is 2.46 J/gC. If both liquids start at the same temperature and exactly 30J of heat are added to each, which liquid's temperature will increase more
Answer:
ethanol
Explanation:
it is a thermometric liquid
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:
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
