Answer:
See explanation
Explanation:
a) Every substance melts at a particular temperature known as the melting point of the substance. The melting point of ice is 0°C. Hence ice melts at 0°C.
b) There are three states of matter; solid liquid and gas. The particles of matter in each stage of matter possess varying degrees of freedom.
In the solid state, the intermolecular forces between the particles of water that compose ice are very strong. Hence the particles do not translate, they only vibrate or rotate about their mean positions.
In the liquid state, the magnitude of intermolecular interaction is less than that of the solids hence the molecules can translate but not with a high kinetic energy.
In the gaseous state, there is a minimum intermolecular interaction between particles theoretically hence the particles are really free to move about with a very high kinetic energy.
A gas that exerts a pressure of
15.6 psi in a container with a volume of
L will exert a pressure of
25.43 psi when transferred to a
container with a volume of 1.895 L.
Answer:
3.089 L
Explanation:
From the given information, provided that the no of moles and the temperature remains constant;
[tex]P_1[/tex] = 15.6 psi
[tex]V_1[/tex] = ???
[tex]P_2[/tex] = 25.43 psi
[tex]V_2[/tex] = 1.895 L
Using Boyle's law:
[tex]P_1V_1 =P_2V_2 \\ \\ V_1 = \dfrac{P_2V_2}{P_1} \\ \\ V_1 = \dfrac{25.43 \times 1.895}{15.6} \\ \\ \mathbf{ V_1 = 3.089 \ L}[/tex]
A 50.0 mL sample of buffer solution contains 0.120 M acetic acid and 0.150 M sodium acetate. If 5.55 mL of 0.092 M NaOH is added to this solution, identify the resulting number of moles of acetic acid, sodium acetate, and NaOH.
Answer:
see calculations below
Explanation:
Given: HOAc ⇄ [H⁺] + [OAc⁻]
C(i) 0.12M 0M 0.15M
mix => 5.55ml(0.092M NaOH) / (50ml + 5.55ml)
= 0.00555(0.092)mole NaOH / 0.0555 L Soln
= 0.0092M in NaOH is added into the initial buffer solution
= 0.0092M in OH⁻ (NaOH is a strong base => 100% ionized)
Rxn => Addition of 0.0092M OH⁻ will react with 0.0092M H⁺ shifting buffer . equilibrium to the right decreasing [HOAc] and increasing [OAc⁻] by . 0.0092M each.
Therfore ...
Given: HOAc ⇄ [H⁺] + [OAc⁻]
C(i) 0.12M 0M 0.15M
ΔC - 0.0092M +x +0.0092M
C(f) 0.1108M x 0.1592M => New Concentrations . after adding 0.0092M . NaOH
Substituting new acid and ion concentrations into Ka expression ...
Ka = [H⁺][OAc⁻]/[HOAc] = (x)(0.1592M)/(0.1108M) = 1.75 x 10⁻⁵M
=> x = [H⁺](new) = (1.75 x 10⁻⁵M*)(0.1108M)/(0.1592M) = 1.22 x 10⁻⁵M in H⁺ ions
*units of Ka are Molar
FYI => Adding a strong base to a buffer solution will shift pH to more basic.
Adding a strong acid to a buffer solution will shift pH to more acidic.
=> (such is a good way to check that your buffer calculations are correct.)
NOTE => Question asks for moles of HOAc, Na⁺OAc⁻ & NaOH after adding base. Giving answers in terms of Molarity (moles/Liter) is same as moles. Therefore ...
[HOAc] = 0.1108M
[NaOAc] = 0.1592M
[NaOH] = ∅M (from rxn of H⁺ + OH⁻ => H₂O, all NaOH was consumed in acid/base reaction. Remaining are only Na⁺ as a spectator ion and OH⁻ as a function of the new concentration of H⁺ => [OH⁻] = Kw/[H⁺] = 1 x 10⁻¹⁴/1.22 x 10⁻⁵ = 8.2 x 10⁻¹⁰M.
Hope this helps. :-)
A box of pills claims that they will make your cold go away sooner. Who
would be the most impartial source for information on this claim?
A. The company that makes the medicine
B. The store that sells the medicine
C. A company that makes a competing medicine
.
D. A university study that tests medicine
Answer:D
Explanation:
If 0.500 mol of acetylene is allowed to completely react with oxygen, what is the final yield of CO2 in moles?
2C2H2(g)+ 5O2(g) - 4CO2(g) + 2H2O(g)
acetylene
Answer:
1.00 moles of CO2 is the final yield.
Explanation:
Based on the reaction:
2C2H2(g)+ 5O2(g) → 4CO2(g) + 2H2O(g)
When 2 moles of acetylene (C2H2) completely reacts with oxygen, 4 moles of CO2 are produced.
To solve this question we must use the chemical equation knowing: 2 moles C2H2 = 4 mol CO2
When 0.500 moles of acetylene react:
0.500 moles C2H2 * (4mol CO2 / 2mol C2H2) =
1.00 moles of CO2 is the final yieldhow many moles are in 1.25x10^20 molecules of HF?
Answer:
1.25×10²⁵ molecules of ethane contains 124.56 moles of Hydrogen atoms.
Which of the following is/are true?
a
Mixing an acid with base to produce salt and water
is a physical change
b Inflating a volleyball is a chemical change
C Tarnishing of silver is a chemical Change
d All of the above
C
Tarnishing of silver is caused by hydrogen sulfide and other sulfur containing compounds in the air reacting to the silver and resulting in a fine layer of silver sulfide. The other answers don't make sense
Choose the options below that are true of chemical equilibria.
A. The reaction proceeds in the forward and reverse directions at the same rate.
B. Both the forward and the reverse reactions are achievable.
C. The relative amounts of all species must be different.
D. There is no net change in concentrations of reactants and products.
Answer:
A. The reaction proceeds in the forward and reverse directions at the same rate.
B. Both the forward and the reverse reactions are achievable.
D. There is no net change in concentrations of reactants and products.
Explanation:
Chemical equilibrium can be defined as the state of a reversible reaction in which the concentration (rate) of the forward reaction is equal to the concentration (rate) of the backward or reverse reaction. Thus, both the reactants and products of the chemical equation don't have the tendency to change with respect to time.
Hence, the options that are true of chemical equilibria include the following;
I. The reaction moves in both forward and reverse directions simultaneously i.e at the same rate.
II. The chemical equation can attain both forward and reverse reactions.
III. The concentrations of both reactants and products are the same i.e there's no net change.
Answer:
A B D knewton
Explanation:
You will prepare a 237.5 ml kool-aid solution with a concentration of 1M. The molar mass of kool-aid (or sugar since kool-aid is basically sugar C12H22O11.) is 342 g/mol. Show the
calculations below which helped you create your 1M solution. Note: 237.5 mL is approximately one cup.
Please show your work here.
Liters of water needed __
Molarity of kool-aid needed __
Grams of kool-aid needed __
The mass of the kool aid needed to prepare the solution is 81.2 g.
What is concentration?The term concentration has to do with the amount of substance present in solution. We are told to make calculations regarding the preparation of a 237.5 ml kool-aid solution with a concentration of 1M.
Litres of water needed = 237.5/1000 = 0.2375 L
Molarity of kool-aid needed = 1 M
number of moles = 1 M * 0.2375 L = 0.2375 moles
0.2375 moles = mass of kool aid/molar mass
0.2375 moles = mass/ 342 g/mol
mass = 0.2375 moles * 342 g/mol
mass = 81.2 g
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Convert 467.00 g AlCl3 to mol AlCl3.
Answer:
467.000g AICI3 to mol AICI3
Explanation
Answer:
7.49959 mol i hope this is right
please answer's these scientist answer's
A scientist observes that the leg bones of cats are similar to the bones in the wings of bats. The scientist concludes the two species share a common ancestor. Which describes why the scientist drew that conclusion?
1. developmental patterns
2. DNA
3. fossil evidence
4 .structural data
Bald eagles might lay up to five eggs at a time, but only one hatchling usually survives. Which feature of natural selection is this an example of?
1 .adaptation
2. genetic variation
3. overproduction
4. selection
Which of these changes would likely occur if the Earth's rotation on its axis
increased in speed? TEKS 8.7(A)
A The length of the seasons would be shorter.
B The length of the seasons would be longer.
C The length of a day would be shorter.
D The length of a day would be longer.
Answer: its c
Explanation:
Which of the following would make experimental results more reliable? A. choosing the data that match the hypothesis B. performing the experiment multiple times C. increasing the number of variables in the experiment D. adding the experimenter's opinion to the conclusions
I think the answer is C. (Increasing the number of variables in the experiment)
Answer:
ITS B
Explanation:
THE OTHER GUY WAS WRONG
Asolutioncontains50gofsugarin250g ofwater.Calculatetheconcentrationin termsofmassbymasspercentageofthe solution.
A piece of Li is
dropped into water
and catches fire
producing LiOH
is a Chemical or physical change
Use the word bank below to answer the questions that follow:
chemical
mixture
heat capacity
homogeneous viscosity sublimation
physical property compound chemical formula
substance density
mass
temperature
pressure
heterogeneous
The ratio of the mass of a substance to its volume is called
Answer:
The ratio of the mass of a substance to its volume is called...density.
Do alloys require a specific amount of ingredients to form?
Answer:
No, alloys are independent of the amount of it's constituents.
Alloys depend on the number of it's constituents.
Only strength of alloys depends on the specific amount of ingredients/constituents/elements.
what is your experience about water pollution
Answer:
water pollution is a process in which water gets polluted due to discharge of city sewage and industrial waste. I was suffering through the water born disease when I drank the contaminated water. The sources of water becomes dirty. It makes environment unbalanced. People suffer from different water born disease when they drink polluted water.
Which of the following statements is/arel correct:
A. Entropy increases with the number of energetically equivalent ways to arrange the components of a system.
B. A given set of conditions such as P, V, T defines a microstate of a system.
C. The change represented below has a positive AS. 04
a. A only
b. A and C only
c. A and B only
d. A, B, and C
There is an increase in entropy because the energetically equivalent ways to arrange the components of the system increased. Option A and C.
What is entropy?The term entropy refers to the degree of disorder in a system. Thus we know that any change that leads to an increase in the number of particles will lead to an increase in entropy.
Hence, we can see from the diagram that the energetically equivalent ways to arrange the components of the system increased hence there is a positive increase in entropy. The correct options are therefore A and C.
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#SPJ1
explain why silver chloride cannot be used as an electrolyte
Answer:
This is because .It doesn't reacts with dilute acid .It is a coinage metal.
Can somebody please help me!!
Answer:
acceleration
pls dont report me
An unknown substance turns blue litmus paper to red. Which additional test could be used to confirm the substance’s identity?
It should turn phenolphthalein from colorless to pink because it is a base.
It should turn phenolphthalein from pink to colorless because it is a base.
It should turn methyl orange to orange because it is an acid.
It should turn methyl orange to red because it is an acid.
Answer:
D
Explanation:
What is the percent of Cu in CuSO4?
What occurs during interphase? (Select all that apply.)
cells store up energy
cells produce eight daughter cells
cells take in nutrients
cells grow
Answer:
during interphase the cells start to grow
cells grow, store up energy, and take in nutrients
hope it helped :)
The two main categories of energy are ___________________ energy (stored
energy) and __________________________ energy (energy presently doing
work or causing change).
Explanation:
The two main categories of energy are potential energy (stored
energy) and kinetic energy (energy presently doing
work or causing change)...I hope this helps.
For each of the following, predict the complete, balanced chemical equation for the reaction that occurs when they are mixed. Make sure to label the states.
1. HNO3 & NaOH
2. Sr(OH)2 & HI
.
Answer:
1. The balanced chemical reaction is:
[tex]HNO_3(aq)+NaOH(aq)\rightarrow NaNO_3(aq)+H_2O(l)[/tex]
2. The balanced chemical reaction is:
[tex]2HI(aq)+Sr(OH)_2(aq)\rightarrow SrI_2(aq)+2H_2O(l)[/tex]
Explanation:
Hello there!
In this case, according to the given chemical reactions, it is necessary to keep in mind the cations and anions are switched around as a result of the bonds rearrangement in these neutralization reactions; therefore, we can proceed as follows:
1. The balanced chemical reaction is:
[tex]HNO_3(aq)+NaOH(aq)\rightarrow NaNO_3(aq)+H_2O(l)[/tex]
Because all atoms are in the same amount at each side of the equation and the resulting salt is soluble.
2. The balanced chemical reaction is:
[tex]2HI(aq)+Sr(OH)_2(aq)\rightarrow SrI_2(aq)+2H_2O(l)[/tex]
Because all atoms are in the same amount at each side of the equation and the resulting salt is soluble.
Best regards!
The isomerization of methyl isonitrile, CH3NC, to acetonitrile, CH3CN, was studied in the gas phase at 215oC, and the following data were obtained: Time (s) [CH3NC] (M) 0 0.0165 2,000 0.0110 5,000 0.00591 8,000 0.00314 12,000 0.00137 15,000 0.00074 (a) Calculate the average rate of reaction, in M/s, for the time interval between each measurement.
Answer:
2.75 × 10⁻⁶ M/s
1.69 × 10⁻⁶ M/s
9.23 × 10⁻⁻⁷ M/s
4.43 × 10⁻⁻⁷ M/s
2.1 × 10⁻⁻⁷ M/s
Explanation:
We have the following information for the isomerization of methyl isonitrile
Time (s) [CH₃NC] (M)
0 0.0165
2000 0.0110
5000 0.00591
8000 0.00314
12000 0.00137
15000 0.00074
To calculate the average rate of reaction (r) for each interval, we need to use the following expression:
r = -Δ[CH₃NC]/Δt
Interval 0-2000 s
r = - (0.0110 M-0.0165 M)/2000 s - 0 s = 2.75 × 10⁻⁶ M/s
Interval 2000-5000 s
r = - (0.00591 M-0.0110 M)/5000 s - 2000 s = 1.69 × 10⁻⁶ M/s
Interval 5000-8000 s
r = - (0.00314 M-0.00591 M)/8000 s - 5000 s = 9.23 × 10⁻⁻⁷ M/s
Interval 8000-12000 s
r = - (0.00137 M - 0.00314 M)/12000 s - 8000 s = 4.43 × 10⁻⁻⁷ M/s
Interval 12000-15000 s
r = - (0.00074 M - 0.00137 M)/15000 s - 12000 s = 2.1 × 10⁻⁻⁷ M/s
The average rates of reactions for the time interval between each measurement are
2.75×10⁻⁶ M/s
1.70×10⁻⁶ M/s
9.23×10⁻⁷ M/s
4.43×10⁻⁷ M/s
2.10×10⁻⁷ M/s
From the question,
We are to calculate the average rate of reaction for each of the measurement.
First, we will create a proper table for the data
Time (s) [CH3NC] (M)
0 0.0165
2,000 0.0110
5,000 0.00591
8,000 0.00314
12,000 0.00137
15,000 0.00074
The average rate of reaction is given by the formula
[tex]Average\ rate\ of\ reaction = \frac{Final\ concentration - Initial\ concentration}{Final\ time - Initial\ time}[/tex]
1.
[tex]Average\ rate\ of\ reaction = \frac{0.0110-0.0165}{2000 -0 }[/tex]
Average rate of reaction = 2.75×10⁻⁶ M/s
2.
[tex]Average\ rate\ of\ reaction = \frac{0.00591-0.0110}{5000 -2000 }[/tex]
Average rate of reaction = 1.70×10⁻⁶ M/s
3.
[tex]Average\ rate\ of\ reaction = \frac{0.00314-0.00591}{8000 -5000 }[/tex]
Average rate of reaction = 9.23×10⁻⁷ M/s
4.
[tex]Average\ rate\ of\ reaction = \frac{0.00137-0.00314}{12000 -8000 }[/tex]
Average rate of reaction = 4.43×10⁻⁷ M/s
5.
[tex]Average\ rate\ of\ reaction = \frac{0.00074-0.00137}{15000 -12000 }[/tex]
Average rate of reaction = 2.10×10⁻⁷ M/s
Hence, the average rates of reactions for the time interval between each measurement are
2.75×10⁻⁶ M/s
1.70×10⁻⁶ M/s
9.23×10⁻⁷ M/s
4.43×10⁻⁷ M/s
2.10×10⁻⁷ M/s
Learn more here: https://brainly.com/question/14189499
(b) the absolute temperature of the gas at which 3.33x103 mol occupies 478 mL at 750 torr,
Explanation:
T=?
Given
n=3.33×10³
V=478mL=4.78L
P=750torr= 0.987 Atm
simply use the formula
PV =nRT
where R is universal gas constant
0.987×4.78= 3.33×10³×8.314×T
T = 0.000170°c
T= 273.15 K!
The absolute temperature of the gas at which 3.33x10³ mol occupies 478 mL at 750 torr is 1.726 × 10-³K
HOW TO CALCULATE TEMPERATURE:
The temperature of a substance can be calculated using the ideal gas law equation as follows:PV = nRT
Where;
P = pressure (atm)V = volume (L)n = number of moles (mol) R = gas law constant (0.0821 molK/Latm)T = temperature (K)According to this question,
P = 750torr = 0.987 atmV = 478mL = 0.478L0.987 × 0.478 = 3.33 × 10³ × 0.0821 × T0.472 = 273.39TT = 0.472 ÷ 273.39T = 1.726 × 10-³KTherefore, the absolute temperature of the gas at which 3.33x10³ mol occupies 478 mL at 750 torr is 1.726 × 10-³KLearn more at: https://brainly.com/question/12124605?referrer=searchResults
the special proteins prevent
a or b
Answer: a
Explanation:
this is common sense
Answer:
C'est fini sous la lettre A. Ice crystals from forming inside it's body
What volume in
L
of a 0.724 M Nal solution contains 0.405 mol of Nal ?
Answer:
0.559 L
Explanation:
Step 1: Given data
Moles of sodium iodide (n): 0.405 mol
Molar concentration of sodium iodide (M): 0.724 M (0.724 mol/L)
Step 2: Calculate the volume of solution (V)
The molarity is equal to the moles of solute divided by the liters of solution.
M = n/V
V = n/M
V = 0.405 mol/(0.724 mol/L) = 0.559 L
(hope this helps can i plz have brainlist :D hehe)
almunium has a density of 2.70g/cm3. how many moles of aluminium are in a 13.2cm3 block of the metal substances?
Answer:
1.32 moles.
Explanation:
From the question given above, the following data were obtained:
Density of Al = 2.70 g/cm³
Volume of Al = 13.2 cm³
Number of mole of Al =.?
Next, we shall determine the mass of Al.
This can be obtained as follow:
Density of Al = 2.70 g/cm³
Volume of Al = 13.2 cm³
Mass of Al =?
Density = mass / volume
2.7 = mass of Al / 13.2
Cross multiply
Mass of Al = 2.7 × 13.2
Mass of Al = 35.64 g
Finally, we shall determine the number of mole of Al. This can be obtained as follow:
Mass of Al = 35.64 g
Molar mass of Al = 27 g/mol
Number of mole of Al =?
Mole = mass / molar mass
Number of mole of Al = 35.64 / 27
Number of mole of Al = 1.32 moles
Thus, 1.32 moles of aluminum are present in the block of the metal.