1. A mixture of ammonium chloride, sand, and zinc chloride should be separated by sublimation.
2. A mixture of zinc chloride and silver chloride should be separated through crystallization.
What is a separation technique?A separation technique can be defined as a technique that is typically used to separate or convert two (2) or more mixture and solution of chemical substances into distinct product such as chemical compounds or elements.
The types of separation technique.In Chemistry, there are various types of separation technique used for the separation of mixtures or solutions and these include:
CrystallizationFractional distillationFiltrationEvaporationSublimationDecantationSimple distillationChromatographyIn this scenario, the most effective and efficient means to separate a mixture of ammonium chloride, sand, and zinc chloride is by sublimation from solid to gas state.
On the other hand, the best means to separate a mixture of zinc chloride and silver chloride is through crystallization.
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If all of the energy from burning 281.0 g of propane (ΔHcomb,C3H8 = –2220 kJ/mol) is used to heat water, how many liters of water can be heated from 20.0°C to 100.0°C? (Assume that the density of water is 1.00 g/mL)
This problem is providing us with the mass of propane, its enthalpy of combustion, and the initial and final temperature of water that can be heated from the burning of this fuel. At the end, the result turns out to be 42.27 L.
Combustion:In chemistry, combustion reactions are based on the burning of fuels by using oxygen and producing both carbon dioxide and water. For propane, we will have:
[tex]C_3H_8+5O_2\rightarrow 3CO_2+4H_2O[/tex]
Hence, we can calculate the heat released from this reaction by using the mass, which has to be converted to moles, and the given enthalpy of combustion:
[tex]Q=281.0g*\frac{1mol}{44.09g}*-2220\frac{kJ}{mol}*\frac{1000J}{1kJ}\\ \\ Q=-1.415x10^7 J[/tex]
Calorimetry:In chemistry, we can analyze the mass-specific heat-temperature-heat relationship via the most general heat equation:
[tex]Q=mC\Delta T[/tex]
Thus, since Q was obtained from the previous problem, but the sign change because the released heat is now absorbed by the water, one can calculate the mass of water that rises from 20.0°C to 100.0°C with this heat:
[tex]m=\frac{Q}{C\Delta T} =\frac{1.415x10^7J}{4.184\frac{J}{g\°C}(100.0\°C-20.0\°C)}\\ \\m=4.227x10^4g[/tex]
Finally, we convert it to liters as required:
[tex]V=4.227 x10^4g*\frac{1mL}{1.00g}*\frac{1L}{1000mL} \\\\V=42.27L[/tex]
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Perform the following calculations to the correct number of significant figures.
(24.5260 × 2.56) + 397.84
Answer:
460.62656
not really sure :(
If two systems at different temperatures have contact with each other, heat will flow from the system at
1
20°C to a system at 303 K
2
30°C to a system at 313 K
3
40°C to a system at 293 K
4
50°C to a system at 333 K
The heat will flow from the system at 40°C to a system at 293 Kelvin.
Flow of temperatureIf two systems at different temperatures have contact with each other, heat will flow from the system at 40°C to a system at 293 Kelvin because temperatures moves from hotter body to cold body.
ReasonWe know that 293 kelvin is equals to 20° Celsius which is lower than 40° Celsius so the heat energy moves from the body having 40° Celsius temperature to the body having 293 kelvin temperature so we can conclude that the heat will flow from the system at 40°C to a system at 293 Kelvin.
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Answer: I was doing hw and this question is one of them
Explanation:
9. How many moles are in 6.022 x 1024 atoms of oxygen?
Answer:
1 mole
Explanation:
The mole (mol) is the amount of a substance that contains the same number of entities as there are atoms in exactly 12 g of carbon-12. One mole (1 mol) contains 6.022x1023 entities (to four significant figures).
What is the molar mass of Al(BrO2)
Answer:
The molar mass is 138.8843 g/mol
how many moles of KCIO3 must be consumed to create 4.5 moles of KCI
Answer:
4.5
Explanation:
2KClO3 ===> 2KCl + 302
Let the number of moles of KClO3 = x
2KClO3 ===> 2KCl + 302
Since the balance numbers are the same for both chemicals KClO3 and KCl whatever you need to get for KCl will be the same as for the KCl
x = 4.5
Need help soon as possible
Answer:
The oeriodic table have 8 groups
Please help me with this one true or false
Answer:
41. False
42. True
43. False
44. False
45. True
46 - 48. Unsure (I don't take Biology, sorry.)
Explanation:
41.
FeS and HCl are the reactants of the chemical equation. Hence, false.
42.
It is common knowledge that HCl and H₂SO₄ are acids. Hence, true.
43.
Vinegar contains acetic acid CH₃COOH, which isn't a base. Hence, false.
44.
Fluorescence is actually the emittance of light by any substance due to radiation. Hence, false.
45.
Yes, the image produced by a plane mirror is laterally inverted. Hence, true.
What is the general formula for cycloalkenes.
How is steal wool and oxygen making iron oxide a chemical reaction? Why?
Answer:
When iron wool combusts, it reacts with oxygen from the air to form iron oxide. Iron oxide is a solid, so the oxygen atoms from the air add to the mass on the balance. The balance tips as the iron wool reacts with the oxygen to form solid iron oxide. from.
Explanation:
Classify the following reaction:
CaO(s) + H₂O(l) → Ca(OH)₂(s)
A) synthesis (or combination)
B) decomposition
C) combustion
D) single displacement (replacement)
E) double displacement (replacement)
Answer:
D) I think is single displacement (replacement)
In a lab you measure out 0.159 mol of C7H14O7. How many grams should you weight out?
1) find the molar mass of C₇H₁₄O₇.
[tex]=7(12.01)\ +\ 14(1.01)\ +\ 7(16.00)\\\\=84.07\ +\ 14.14\ +\ 112.00\\\\=210.21\ g/mol[/tex]
2) solve using dimensional analysis
[tex]=0.159\ mol\ C_{7}H_{14}O_{7}[/tex] × [tex]\frac{210.21g\ C_{7}H_{14}O_{7}}{mol\ C_{7}H_{14}O_{7}}[/tex]
= 33.42339
= 33.4g C₇H₁₄O₇
what cases might humans need to collaborate with computers to solve a problem
Answer:
Like when they work of need to look something important
Explanation:
like image you are chilling and then your like omg I need to turn in the work and you go to your computer and send it but you used your computer
Elements on the far right of the periodic table are
Answer: The group of elements at the far right of the table (Group 18) is known commonly as the noble gases. They are generally chemically inert.
Explanation: There names are:
He = Helium
Ne = Neon
Ar = Argon
Kr = Krypton
Xe = Xenon
Rn = Radon
Elements on the far right of the periodic table are noble gases. They are generally chemically inert.
What are noble gases ?The noble gases are a group of chemical elements that share several characteristics. They are all monatomic, odorless, and colorless gases with relatively little chemical reactivity under normal conditions. Helium, neon, argon, krypton, xenon, and radioactive radon are the six types of noble gases that are found in nature.
In order of mass, the noble gases are helium, argon, krypton, xenon, and radon. They are known as noble gases because of how beautiful they are and how little they mostly react with anything.
The noble gases are employed to create inert atmospheres, usually for arc welding, to shield specimens and prevent chemical reactions. The substances are utilized in lasers as well as lamps like neon and krypton headlamps. Helium is used in balloons, air tanks for deep sea divers.
Thus, Elements on the far right of the periodic table are noble gases.
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Mary has blue eyes (bb) and David has brown eyes (Bb), if David and Mary have four children
what will their eye color be? Will all of their children have the same eye color? Why or why not.
Answer:
If they all had the same eye color it would probably be hazel, but If they did not then it would either be blue or brown.
Explanation:
Hope this helps
The bell rings at the end of
class and you jump up to head
for the door. When you stand
up, you feel
light-headed.
What happens in your body? What systems are involved ?
Muscular and nervous system involved
No eh I cant do this omg
Answer:
you can do it
Explanation:
Match these items.
1 .
water droplets
necessary organisms in nitrogen cycle
2 .
denitrification
release of nitrogen from nitrogen compounds
3 .
bacteria and plants
process of using oxygen to obtain energy from carbon-containing food
4 .
respiration
forms as water vapor condenses
5 .
people and animals
use plants for food
Based on the volcanic mountain range shown on the map, describe the motion of
the plates and identify the type of plate boundary in this region.
Answer:
convergent boundary subduction zone
Explanation:
Answer:
The motion of the plates would be considered a convergent boundary which is where old crust goes under the new crust and is reheated overtime. This could also be known as a convection current. This is when the mantle is heated up and rises to the top an when it cools off, it goes back down and then that cycle repeats itself overtime.
Explanation:
Plato
Determine the element symbol, mass number, and charge for an atom or ion that has a 51 neutrons, 38 protons, and 36 electrons.
Answer:
Strontium
Explanation:
To find the element, we need to know the atomic number. There is this rule in chemistry that says that the number of protons and the atomic number are the same. Since we know that there are 38 protons, the atomic number is also 38, leading us to Strontium. Sr -- element symbol.
The mass number is located below the element symbol on a periodic table. The mass number or the atomic mass for Strontium is 87.62 u.
Since there are an uneven amount of protons and electrons, let's subtract the number of electrons from the number of protons to find the difference. 38-36 = 2. (Also, protons are positive and electrons are negative, meaning there are more + than - in the ionic charge). Which means, the atom has a +2 ionic charge.
A sample of argon has a volume of 1.20 L at STP. If the temperature is increased to 26.0°C and the pressure is lowered to 0.800 atm, what will the new volume be, in L?
Key words:-
Pressure=PVolume=VTemperature=TNow
P1=1atmP_2=0.800atmV1=1.2LV2=LT1=273KT2=26°C=299KApply combined gas law
[tex]\\ \tt\hookrightarrow \dfrac{P_1V_1}{T_1}=\dfrac{P_2V_2}{T_2}[/tex]
[tex]\\ \tt\hookrightarrow \dfrac{1(1.2)}{273}=\dfrac{(0.800)V_2}{299}[/tex]
[tex]\\ \tt\hookrightarrow 0.004=0.002V_2[/tex]
[tex]\\ \tt\hookrightarrow V_2=2L[/tex](Approx)
Percocet contains oxycodone at varying strengths.Every strength also contains 325 mg of
acetaminophen per tablet.If the dose is not to exceed 3.9g of acetaminophen daily,what
is the maximum number of Percocet tablets a patient can take daily?(unit conversion)
The maximum number of Percocet tablets a patient can take daily, while staying within the recommended acetaminophen dose of 3.9g, is 12 tablets.
To determine the maximum number of Percocet tablets a patient can take daily without exceeding the recommended dose of 3.9g of acetaminophen, we need to perform a unit conversion.
1. Convert 3.9g to mg (since the amount of acetaminophen per tablet is given in mg): 3.9g = 3900mg
2. Calculate the number of Percocet tablets based on the amount of acetaminophen per tablet: Each Percocet tablet contains 325mg of acetaminophen.
3. Divide the maximum allowable dose of acetaminophen (3900mg) by the amount of acetaminophen per tablet (325mg) to find the maximum number of tablets: 3900mg / 325mg = 12 tablets
Therefore, the maximum number of Percocet tablets a patient can take daily without exceeding the recommended dose of acetaminophen (3.9g) is 12 tablets.
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A rectangular box is 10 inches wide, 8 inches long and 6 inches deep. What is its
volume in cubic inches and cubic centimeters? If the box has a mass of 1 kilogram, what is its
density in gram/milliliter?
The Volume and the density of the box are 480 in³, 7865.81 cm³, 0.127 g/mL
What is volume?This is the measure of the capacity of substance an object can hold.
To calculate the volume of the box, we use the formula below
Formula:
V = LWH................. Equation 1Where:
V = Volume of the boxL = Length of the boxW = Width of the boxH = Height of the box.From the question,
Given:
L = 10 inchesW = 8 inchesH = 6 inches.Substitute these values into equation 1
V = 10(8)(6) V = 480 in³We convert the volume from cubic inches to cubic centimeters using the expression below.
V = (480×16.3871) = 7865.81 cm³What is density?Density can be defined as the ratio of the mass and volume of a body.
To calculate the density of the box, we use the formula below.
D = m/V.................. Equation 2From the question,
Given:
m = 1 kg = 1000 gV = 480 in³ = (480×16.3871) milliliter = 7865.81 mLSubstitute these values into equation 2
D = 1000/7865.81D = 0.127 g/mLHence, The Volume and the density of the box are 480 in³, 7865.81 cm³, 0.127 g/mL.
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Heather ran 100 meters in 20 seconds. What is her speed? Just type the number, no labels.
help pls you get 22 points if you answer me
Answer:
the 2nd one
Explanation:
All other symbols are for Mathematics.
Help!
Which statement about common descent is correct?
A Few species on Earth descended from a common ancestor; most life occurred independently.Few species on Earth descended from a common ancestor; most life occurred independently.
B All life on Earth descended from a common ancestor.
C Some species on Earth descended from a common ancestor; other species do not share any lineage.
D Most species on Earth descended from a common ancestor; some species do not share any lineage.
Answer:
All life on Earth descended from a common ancestor
At 25 oC , the following liquids have density:
water - 0.9982 g/mL; toluene - 0.8669 g/mL; chloroform - 1.4832 g/mL
What mass would a 10.00-mL sample of each of the liquids?
Answer:
Water- 9.982 grams
toluene-8.669 grams
chloroform - 14.832 grams
Explanation:
the units of density are listed as g/mL. So for every mL of substance you have, you will have that many grams.
Water- .9982g/mL * 10 mL
As you can see, the units of "mL" cancel each other out, leaving just the gram amount of water.
The speed of a car is 16 meters per second. What is this speed in miles per hour? What is
а
this speed in miles per hour? (1.61 km = 1 mile, 60 seconds = 1 minute, 60 minutes = 1 hour)
Select one:
a. 180 miles per hour
b. 58 miles per hour
O c. 7.2 miles per hour
d. 36 miles/hour
e. 360 miles per hour
Conversion Factors:
1.61 km = 1 mile
60 sec = 1 min
60 min = 1 hour
Use dimensional analysis to solve.
[tex]=\frac{16\ meters}{1\ second}[/tex] × [tex]\frac{1\ km}{1000\ meters}[/tex] × [tex]\frac{1 mile}{1.61\ km}[/tex] × [tex]\frac{60\ seconds}{1\ min}[/tex] × [tex]\frac{60\ min}{1\ hour}[/tex]
[tex]=35.77639752[/tex]
= 36 miles/hour
If done properly, you should be left with the units miles/hour
What is the mass of a sample containing 1.94 moles of Ca? ______g
Answer:
77.8 grams of Ca
Explanation:
True or False:
The periodic table that is used today is the same as the periodic table that was first developed by the scientist Dmitri Mendeleev
Answer:
False
Explanation:
Mendeleev was the first scientist to arrange the element in such a periodic order but there was a mistake that he arranged in increasing order of mass.Today we use the periodic table given by Henry Mosley where atomic no is first priority