Answer:
Chocolate drink can easily be dissolved in Hot water than cold water.
Explanation:
Chocolate drink can easily be dissolved in Hot water than cold water because hot water has more heat or thermal energy than cold water. When water is heated and becomes hot, the molecule of water gain alot of energy and this make it to move very fast and as these molecules move faster, they begin to come in contact with the molecules of chocolate drink, thereby making it to dissolve faster than that of cold water.
Earth is a single interconnected system. True False
Answer:
True
Explanation:
Earth is a single interconnected system but it can be subdivided into smaller systems.
Use the solubility rules from the Lab 4 introduction and your knowledge of qualitative separation schemes from the lab to answer the following questions.
The qualitative analysis experiment you did is actually an abbreviated version of a much larger analysis scheme in which many different cations are separated and identified. Suppose a mixture contains Ag+, K+, NH4+, Hg22+, Pb2+, Mg2+, Sr2+, Ba2+, Cu2+, Al3+ and Fe3+.
(a) Which of the following ions could you separate, by causing them to precipitate, with the addition of HCl? (Hint: HCl is a source of chloride ions. Select all that apply.)
Ag+ K+ NH4+
Hg22+ Pb2+ Mg2+
Sr2+ Ba2+ Cu2+
Al3+ Fe3+
(b) After the addition of HCl, the above sample is centrifuged and decanted. Which of the following cations remaining in the supernatant could you separate, by causing them to precipitate, with the addition of H2SO4? (Hint: H2SO4 is a source of sulfate ions. Select all that apply.)
Ag+ K+ NH4+
Hg22+ Pb2+ Mg2+
Sr2+ Ba2+ Cu2+
Al3+ Fe3+
(c) After the addition of H2SO4, the above sample is centrifuged and decanted. Which of the following cations remaining in the supernatant could you separate, by causing them to precipitate, with the addition of H2CO3? (Hint: H2CO3 is a source of HCO3− and carbonate ions. Select all that apply.)
Ag+ K+ NH4+
Hg22+ Pb2+ Mg2+
Sr2+ Ba2+ Cu2+
Al3+ Fe3+
(d) Choose one of the cations above and write the net precipitation reaction that occurs. (Use the lowest possible coefficients. Include states-of-matter under the given conditions in your answer.)
Cu2+(aq) + (CO3)2-(aq) → CuCO3(s)
Your answer contains an improperly or incompletely formatted chemical formula. Your answer contains improper superscript or subscript
Answer:
Explanation:
a ) silver chloride AgCl and lead chloride PbCl₂ Hg₂Cl₂ , are not dissolved in ware
so Ag⁺ and Pb⁺² Hg₂ ⁺² will precipitate out .
b ) BaSO₄ , SrSO₄ are insoluble
Ba⁺² and Sr⁺² will precipitate out .
c )
Al₂( CO₃)₃ , Fe₂(CO₃)₃ , CuCO₃ insoluble .
Al⁺³ and Fe⁺³ and Cu⁺² will be insoluble .
d )
2Fe⁺³(aq) + 3CO₃⁻²(aq) = Fe₂(CO₃)₃ (s)
The forces that hold atoms together in an element determine its
F. conductivity
G.melting temperature only
H.hardness only
J.melting temperature and hardness
A testable explanation of or answer to a scientific question that is based on prior knowledge or research is a(n)
Answer:
the answer is HYPOTHESIS your welcome
Explanation:
14)
A Kelvin temperature equivalent to 25°C is:
A)
-248K
B)
25K
C)
248K
D)
298K
Answer:
25°C + 273.15 = 298.15K , so D.) is the Answer
Explanation:
The image below shows uncharged particles bouncing around.
State of Matter
Which state of matter is most likely represented in the image? (5 points)
Gas
Solid
Liquid
Plasma
This problem is providing information about the states of matter and a given diagram showing a molecular arrangement it has. Thus, we can start off by analyzing the attached file, which shows molecular arrangements and movements each state exhibits.
Solids are quite organized so that they are able to form molecular networks in which molecules vibrate but do not displace anywhere. Liquid molecules are close enough to have small movements and vibrations but are not able to form any organized network.
Gases, however, exhibit no molecular organization but large movements inside the container whose walls the gas constantly crash against. Plasma do not have any order neither yet it contains ions.
In such a way, since the given diagram do not have any apparent order or ion, we infer this is about a gas that moves into the container and crash against its walls.
Learn more:
https://brainly.com/question/18538345https://brainly.com/question/9402776How many atoms of each element are in 4Na3PO4?
Answer:
12 sodium 4 phosphorus 16 oxygen. makes the table below to determine the number of atoms of each element in the chemical formula 4Ca(ClO3)2.
U
Question 13
4 pts
Using the formula Na + Cl2 --> NaCl, if 3.93 moles of chlorine are combined
with excess* sodium, how many moles of sodium chloride will be made? Note
that in this question, excess means extra or as much as you need.
Answer:
7.86 moles of sodium chloride are produced.
Explanation:
Given data:
Moles of chlorine = 3.93 mol
Amount of sodium = excess
Moles of sodium chloride formed = ?
Solution:
Chemical equation:
2Na + Cl₂ → 2NaCl
Now we will compare the moles of sodium chloride with chlorine.
Cl₂ : NaCl
1 : 2
3.93 : 2×3.93 = 7.86
Chlorine is limiting reactant that's why we compare the NaCl with only number of mole of chlorine.
Thus, 7.86 moles of sodium chloride are produced.
What is the definition of the word: Property (the scientific definition A makes up matter; makes up the world around us B an object or diagram C something that can be observed about a substance D to change the position of something HEalPPPPPPpPP
Answer:
i feel like the answer is A
What is the density if the mass is 25 g and the volume is 114 mL?
Answer:
0.219 g/mL.
Explanation:
From the question given above, the following data were obtained:
Mass = 25 g
Volume = 114 mL
Density =.....?
Density of a substance is simply defined as the mass of the substance per unit volume of the substance. Mathematically, it is expressed as:
Density = mass /volume
With the above formula, we can obtain the density of the substance given in the question above as follow:
Mass = 25 g
Volume = 114 mL
Density =.....?
Density = mass /volume
Density = 25/114
Density = 0.219 g/mL
Therefore, the density of the substance is 0.219 g/mL
the sun has the same diameter as jupiter?
4. Which of the following is the most stable isotope?
Polonium-210
Uranium-237
Francium-227
Plutonium-238
Half-life
(hr)
3,310
162
0.04
768,000
A. Polonium-210
B. Uranium-237
C. Francium-227
D. Plutonium-238
Answer: D. Plutonium-238 is the most stable isotope
Explanation:
Radioactivity is the process of unstable isotopes to stable isotopes by decay, by emitting certain particles (such as alpha (α), beta (β), gamma (γ) particles)
General formulas used in decay:
T = duration of decay
t 1/2 = half-life
N₀ = the number of initial radioactive atoms
Nt = the number of radioactive atoms left after decaying during T time
Half-life shows the time it takes for an atom to get half of its initial mass (to decay to half of its initial mass)
The longer the half-life indicates the stability of the atom
Half-life (hr) of isotopes :
Polonium-210 : 3,310
Uranium-237 : 162
Francium-227 : 0.04
Plutonium-238 : 768,000
The half-life value above shows that Plutonium-238 has the longest time, making it the most stable
The longer the half life of an isotope higher will be its stability. Here, among the given isotopes, plutonium - 238 has the greater half life. Hence it is the mist stable one.
What is half life ?Heavy unstable radioactive isotopes undergoes nuclear decay through the emission of charged particles such as alpha or beta. The unstable isotopes then converts to other stable nuclei or to isotopes with more half life.
Half life of a radioactive isotope is the time required to decay the half of initial amount of the isotope. It is inversely proportional to the decay constant of the nuclear decay.
Among the given isotopes, Pu-238 has the longer half life time. Longer half time means more time to get decayed by half then more stability. Thus, Pu-238 is the most stable one.
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What happens to the electrons when an electric field is applied?
When electric voltage is applied, an electric field within the metal triggers the movement of the electrons, making them shift from one end to another end of the conductor
Explanation:
When electric voltage is applied, an electric field within the metal triggers the movement of the electrons, making them shift from one end to another end of the conductor
PLEASE HELP ME ASAP!!!!!! i hope you can see this!!! if you do this can you please show your work
Answer:
3.83%
Explanation:
First, find the average of the measured value. You should get 286.
291 + 287 + 295 + 281 = 1154
1154/4 = 288.5
Subtract the accepted value (300) from the average measured value (286). Take the absolute value of your answer. You should get 14.
288.5 - 300 = -11.5 = 11.5
Divide the difference from the above problem (14) by the accepted value (300). You should get 0.0467.
11.5/300 = 0.0383
Multiply by 100%.
0.0383 × 100% = 3.83%
The percent error is 3.83%.
Answer:
3.83 percent
Explanation:
Accepted Value = 300 degrees celsius
So since we are given the formula for percentage error,
we know that we have to find the average measured value since the accepted value is already provided
Average Measured Value:
Sum of all measured values / number of measured values
(291 + 287 + 295 + 281) / 4
1154 / 4
288.5 degrees celsius
Now, plugging the values in the given formula:
(average measured value - accepted value) *100 / accepted value
(288.5 - 300) * 100 / 300
-1150 / 300
-3.83 percent
Taking Absolute Value:
3.83 percent
Hence, the average value of the temperature is 3.83 percent less than the accepted value
You have three mugs of tea:
a. Is a small mug. It is 100°F
b. Is a large mug. It is 120°F
c. Is a small mug. It is 120°F
Put these mugs in order. Start with the mug with the SMALLEST amount of thermal energy first and end with the mug with the LARGEST amount of thermal energy.
__2__ C. is a small mug. It is 120°F
__3__ A. is a small mug. It is 100°F
__1__ B. is a large mug. It is 120°F
Answer:
ACB
Explanation:
Thermal energy is the average sum of all kinetic energy of all the molecules of gases. The correct order of mug in decreasing thermal energy is C>A>B.
What is Thermal energy?
Thermal energy is a energy which is possess by a moving object. It is directly proportional to kinetic energy of the molecules. It is very difficult to find the correct value of kinetic energy so we find average kinetic energy. Which is very easy to calculate as compared to calculating kinetic energy. Average kinetic energy is directly proportional to temperature. It is not dependent on the type of gases or mass of gases.
Mathematically,
K.E=2/3KT
Where,
K= Boltzmann constant
T is the temperature
Between A and C whose volume is same, 120°F is the highest temperature so, C will have high thermal energy than A. C will have lowest thermal energy as it has volume larger than that of A and C.
Therefore, the correct order of mug in decreasing thermal energy is C>A>B.
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Consider an isolated system (no heat, matter, work exchange with the environment) consisting of three internal compartments: A on the left, B in the center, and C on the right.Initially the central volume B is filled with an ideal gas at 298K andtheothertwo are empty. Consider the following two processes:a.The valve to the A side is opened, the gas expands freely into compartment A, and the system comesto equilibrium. Then, the valve to the C compartment is opened, and the system comes to equilibrium. b.Both valves are opened simultaneously, the gas expands freely into both compartments, and the system comes to its equilibrium. Which process produces more entropy
Answer:
Both processes produce equal entropy
Explanation:
Three compartments : A , B , C
A to the left, B in center, C on the right
compartment B is filled at 298 k while A and C is empty
The process that produces more entropy is: both processes and this is because the system is an isolated system with no heat matter and work exchange with the environment. and also entropy is independent of the path a process follows so either valve been open does not affect the entropy in the system because the change in the internal energy of an isolated system = 0
Please help, I will give brainliest
If a solid has a density greater than 1 g/ml will it sink or float?
Answer:
if an object weighs more than an equal volume of water, it is more dense and will sink, and if it weighs less than an equal volume of water, it is less dense and will float. Remember that the density of water is about 1 g/cm3.
Determine a piece of copper with a volume of 100 cm power 3 has a mass of 890 g. Explain how you could use this information to find out how much mass would be in 13 cm power 3 of copper
Cl2 is a stable diatomic molecule. It can be decomposed to form two Cl atoms as
shown below.
Cl2 → 2Cl(9)
Predict the change in enthalpy (AH) of this reaction.
A) AH is (-); endothermic
B) AH is (+); endothermic
C) AH is (-); exothermic
D) AH is (+); exothermic
E) AH = 0; thermoneutral
Answer:
Option B: ΔH is (+); endothermic
Explanation:
From the reaction Cl2 → 2Cl(g) given, we can see that the number of moles on the left hand side is 1 while on right hand side, it is 2. This means the number of moles are increasing and it means that the randomness of the system has increased. Also, the bonds are being broken down.
Therefore, the reaction is endothermic. In endothermic reactions, ΔH is positive.
Thus, the correct option is option B.
Answer:
b
Explanation:
ah
Stomach acid is predominately hydrochloric acid. Write the balanced chemical equation for the neutralization reaction between HCI and the active ingredient.
Express your answer as a chemical equation. Identify all of the phases in your answer
Answer:
HCl + Mg(OH2) ---> MgCl2 + H2O
Explanation:
hydrochloric acid + magnesium hydroxides ==> magnesium Chloride (a salt) + Water
HCl + Mg(OH2) ---> MgCl2 + H2O
HELPPPP . what is this
I'll be honest I'm guessing,
but maybe D
can someone please help me
30 points!! please help chem question
the state of y at room temperature is gas, good luck!
A Geiger counter used in several applications over the course of a typical day produces on the average 100 counts per second. The tube is in the form of a cylinder 5 cm in diameter by 20 cm long and is filled with a mixture of 90% argon and 10% ethanol to a pressure of 0.1 atmosphere. In the Geiger-Muller region, each output count results from the formation of about 1010 ion-electron pairs. How long will it take for one-third of the quenching gas to be used up, thus necessitating replacement of the tube
Answer:
As it is given that
[tex]activity=\lambda= 100\\[/tex]
[tex]Number~of ~counts=100/second\\[/tex]
Using formula
[tex]ln(\frac{N}{N_o})=-\lambda\cdot t\\\\[/tex]
or
[tex]-\frac{ln(\frac{N}{N_o})}{\lambda}= t\\\\[/tex]
where [tex]N=\frac{N_o}{3}[/tex]
[tex]-\frac{ln(\frac{1}{3})}{100}= t\\\\\-\frac{-1.0986}{100}=t\\\\[/tex]
[tex]\frac{1.0986}{100}=t\\1.0986\cdot 10^{-2}seconds=t\\[/tex]
What is an individual living entity called?
tissue
cell
organism
organ
Answer:
it is organism the third one
How many C atoms are there in a sample of C,H, that contains 6.59 x 1026 H atoms?
A. 1.98 x 1027 C atoms
B. 2.47 x 1026 C atoms
C. 4.94 x 1026 C atoms
D. 3.17 x 1024 C atoms
Answer:
bill gates
Explanation:
if you know any answer to this pls help out I'll give brainiest plus a lot of points
Answer:
I cant see it clearly
Explanation:
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What is the most likely reason a computer model is used for a black hole?
Answer:
Black holes are merely the most exotic example of the general principle that ... quantum computer stores bits on protons and uses magnetic fields to flip them. ... Powered by Standard Model software, the universe computes
Explanation:because they are mostly exotic
An object that is 0.5 m above the ground has the same
amount of potential energy as a spring that is stretched
0.5 m. Each distance is then doubled.
How will the potential energies of the object and the
spring compare after the distances are doubled?
O The gravitational potential energy of the object will
be two times greater than the elastic potential energy
of the spring.
O The elastic potential energy of the spring will be four
times greater than the gravitational potential energy
of the object.
The elastic potential energy of the spring will be two
times greater than the gravitational potential energy
of the object
O The potential energies will remain equal to one
another
The elastic potential energy of the spring will be two times greater than the gravitational potential energy of the object.
Answer:
C.) The elastic potential energy of the spring will be two times greater than the gravitational potential energy of the object.
Explanation:
Hope this helps! Sorry if I am wrong. ;-;
