Answer:
C 20 L
Explanation:
Apply the formula C1 × V1 = C2 × V2 where, C1 = initial concentration , 12M V1 = initial Volume , ? C2 = Final concentration,0.25M V2 = Final Volume , 1.0L V1 = C2 x V2
What percentage of the heat lost by the hot object(s) was gained by the water? Explain at least three factors that might have caused the results of parts D and E to be different
Answer:
Heat gains or losses result in changes in temperature, changes in state or the performance of work. Heat is a transfer of energy. When gained or lost by an object, there will be corresponding energy changes within that object.
Answer:
102.8312649 --> 103%
The marbles there must not be any hear going anywhere else. If any heat energy warmed up anything else in the system then that is heat that did not go to the marbles.
[tex]\frac{Answer D}{Answer E} x 100 = ???[/tex]
(This is the equasion I used to got my answer)
2119.121 / 2060.775 x 100 = ???
2119.121 / 2060.775 = 1.028312649
1.028312649 x 100 = 102.8312649
102.8312649 --> 103%
NaOH (aq) + CuSO4(aq) →
balance the equation.
When hydrogen peroxide
decomposes, what mass of
hydrogen peroxide is needed
in solution to produce 1.6 g of
oxygen gas?
Answer
34g
Explanation:
equation:2H2O2 ------------ 2H2O + O2
mole ratio: 2: 2 : 1
RMM of O2 - (16*2) = 32
RFM of H2O2 - (1*2) + (16*2) = 34
1 MOLE O2 - 32g
? - 1.6g
1.6/32 = 0.5 MOLES
0.5*2 = 1 MOLE OF H2O2
I*34 = 34 g
which property can be used to help identify many minerals?
Answer:
Minerals can be identified by their color, luster, streak, cleavage, hardness, and even by their chemical composition. Using these properties is one way a Geologist defines and identifies what kind of mineral a specimen is.
What does the shape of the moon we see depend on?
The position of the moon during its orbit around Earth
The position of the moon during its orbit around Jupiter
The position of the moon during its orbit around Mars
The position of the moon during its orbit around Saturn
Answer:
The position of the moon during its orbit around Earth
Answer:
the angle you look at it from
There are four states of matter, solid, liquid, gas and plasma. In order for matter to change between the different states it must undergo a phase change. Which of the following
phase changes are endothermic?
Answer:
solid liquid and gas
Explanation:
What is biographical article?
Answer: it’s A historical article is a kind of scholarly papers where the writer recounts the account of somebody's life.
Explanation: Brainlest please
You are given a pure sample of a colourless gas in a test tube. It is
either oxygen, nitrogen or hydrogen. Explain how you would
identify the gas.
Answer:
Explanation:
If the gas pops when the top of the test tube is placed close to a flame it is hydrogen,
If it re-ignites a glowing splint it's oxygen.
Otherwise the gas is nitrogen.
Can I get help in #6 ?
option A Hydrogen will have the greatest rate of effusion beacuse it has the least mass among all
what was the significance oh Rutherford's expierment
Answer:
His gold foil experiment showed that the atom is mostly empty space with a tiny dense positively-charged nucleus. Based on those results, Rutherford was able to propose the nuclear model of the atom.
How many milliliters of a 0.1000 M NaOH solution would be needed to neutralize a 1.0000-g sample of potassium hydrogen phthalate (KHC8H4O4) to a phenolphthalein endpoint, according to the following balanced equation?
KHC8H4O4(s)+NaOH(aq)------> KNaC8H4O4(aq)+H2O(l)
Answer: 2) 2HCl(sq) + CaCO3(s) CaCl2(sq) + CO2(g) + H2O (l) No of moles of CaCO3 = amount of the CaCO3 (g)/mw of CaCO3 (g/mole)= 0.8085 g/100 g/mole = 0.008085
Explanation:
A 28. 0 ml sample of vinegar, which is an aqueous solution of acetic acid, ch3cooh, requires 21. 5 ml of 0. 550 m naoh to reach the endpoint in a titration
Concentration of vinegar sample of 28mL which requires 21. 5 ml of 0.550 M NaOH to reach the endpoint in a titration is 0.42M.
How do we calculate the concentration of Vinegar?Concentration of vinegar in the titration method will be used by using the below equation:
M₁V₁ = M₂V₂,
M₁ & V₁ are the molarity and volume of acetic acid.M₂ & V₂ are the molarity and volume of vinegar sample.By putting values on above equation from the question, we get
M₂ = (0.55M)(21.5mL) / (28mL) = 0.42 M
Hence, required concentration of vinegar is 0.42M.
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What intermolecular forces are present between two molecules of hi?.
HI does not have any hydrogen atoms, it cannot exhibit hydrogen bonding instead HI is a heteronuclear diatomic molecule show dipole-dipole intermolecular force.
What is intermolecular force attraction?The forces of attraction or repulsion among the particles of atoms or molecules in either solid, liquid, or gaseous state For example covalent bond.
These forces are weaker than Intramolecular Forces and the strength of the intermolecular forces of attraction explain the type of interaction that will occur between two molecules.
Intermolecular forces involve in both structural features and physical properties of the substance.
This force seen in the same molecule or a polyatomic ion affect the chemical properties of the substance.
Water is the best studied example of Intermolecular forces of attraction.
Different types of intermolecular forces are Dipole-dipole interactions, Dipole-induced dipole, Ion-dipole interactions, Ion-induced dipole interactions, Dispersion forces, Hydrogen bonding
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Most scientists use scientific methods in which of the following orders
Answer:
Experiment, analysis, research, purpose, hypothesis and conclusion.
How many mols of water are produced from 88.0g of methane?
Answer:
C3H8(g) + 5O2(g) → 3CO2(g) + 4H2O(g)
88.0g ………………….. ………………………..?g
88.0g C3H8 x (1 mol C3H8 / 44.0g C3H8) x (4 mol H2O / 1 mol C3H8) x (18.0g H2O / 1 mol H2O) = 144g H2O
Dominic and Eva are using the same type of stopwatches to measure the time it takes for a chemical reaction to occur. They each use the same stopwatch to measure the time. These are their results:
Person Trial 1
Dominic 78 seconds
Eva 81 seconds
Why are their results unreliable and can lead to a pseudoscientific claim?
They did not repeat their tests multiple times.
They used the same type of stopwatch.
They did not change the reactants in their chemical reactions.
Only one person should have collected the data.
Na2co3 nahc2o4 fecl3 nh4br kclo4 acidic basic or neutral
The state of the compounds are:
Na₂co₃- basic salt
NaHC₂O₄- acidic
FeCl₃- acidic
NH₄br- acidic
KClO₄- neutral
What is the state of the compound?The state of the compound is its acidity, basicity, and neutrality. The compounds are the mixture of opposite elements.
Thus, the state of the compounds are:
Na₂co₃- basic salt
NaHC₂O₄- acidic
FeCl₃- acidic
NH₄br- acidic
KClO₄- neutral
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Na₂CO₃, NaHC₂O₄ and FeCl₃ are basic, acidic and acidic respectively.
Why pH is used for?pH scale is used to define the nature of a substance as acidic, basic or neutral. Value from 0 to 6.9 shows the acidity, 7 shows the neutrality and from 7.1 to 14 shows the basicity.
Na₂CO₃ is basic in nature, as it is formed by the reaction between strong base and weak acid. NaHC₂O₄ is an acid, as in it carboxylic group is present. FeCl₃ is acidic in nature as it is made from strong HCl acid.Hence, Na₂CO₃, NaHC₂O₄ and, FeCl₃ are basic, acidic and acidic respectively.
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A gas sample has a volume of 126 ml at 58. 0∘c. What is the volume of the gas at 118∘c
Answer:
148.8 ml
Explanation:
V1/T1 = V2/T2
T2 * V1/T1 = V2 (T must be in K units)
(118 + 273.15) * 126 /(58 + 273.15) = 148.8 ml
what is the element name:-
CO
Co
Answer:
the name is Carbon monoxide.
Good luck.
The ph of a. 25m aqueous solution of hf is 2. 3. What is the value of ka for hf?
pH is the concentration of the hydrogen ion in the solution. The value of Ka for hydrogen fluoride is 2.7688.
What is pH?pH is the potential of the hydrogen or the hydronium ion in the solution that depicts the acidic or the basic character of the solution.
Given,
pH = 2.3
Concentration of hydrogen fluoride = 0.25 M
The concentration of hydrogen ion is calculated as:
[tex]\begin{aligned} \rm pH & = \rm - log [H^{+}]\\\\2.3 &= \rm - log [H^{+}]\\\\&= 0.832\;\rm M\end{aligned}[/tex]
Ka is calculated as:
[tex]\begin{aligned} \rm Ka &= \rm \dfrac{[H^{+}]F^{-}]}{[HF]}\\\\&= \dfrac{0.832 \times 0.832}{0.25}\\\\&= 2.7688\end{aligned}[/tex]
Therefore, 2.7688 is the Ka for hydrogen fluoride.
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It takes 83 ml of a 0.45 m naoh solution to neutralize 235 ml of an hcl solution. what is the concentration of the hcl solution?
why global warming is a big problem to us
Explanation:
Global warming indeed is a big problem to us. But not only us, it is a big problem to all living things on the Earth. Global warming as everyone knows is a topic that has been with us for a long time. Global warming happens in multiple ways like deforestation, due to harmful gases (Like carbon doxide) and etc... Global warming simple means that our Globe is warming or is heating up. This is a big problem to all living things on Earth.
It is a big problem to us because increase in temperature throughout the globe and due to this Ice in the Antarctic and the Arctic is melting and is causing damage to habitat of animals and also this is causing the sea level to rise and also this is wasting drinking water that us humans have. So this is clearly a problem to all.
But there is good news that now because people are now starting to care for the planet by reducing the amount of harmful gases released to the environment and also starting Reforestation programs.
So In my opinion Global warming is a big problem to all living things on Earth.
- 35. Which of the following processes are exo- thermic? Endothermic?
Consider the alkane below. a six-sided polygon has c h 2 at each corner. which property differentiates this alkane from other classes of alkanes? the shape the types of bonds the number of carbon atoms the number of hydrogen atoms
This particular alkane is distinguished from all the other alknes by reason of the shape of the alkane.
What are alkanes?The term alkanes has to do compounds that have only a carbon to carbon single bond. We have to note that alknaes can be cyclic, linear or branched. All this types of alkanes are easily recognized by shape.
This particular alkane is distinguished from all the other alknes by reason of the shape of the alkane.
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Answer: A) The shape
Explanation:
edge 22 - took the quiz and got it correct
hope it helps <3
Which of these equations is balanced? (Select all that are correct)
2Fe + 3Cl₂ → 2FeCl₃
H₂ + O₂ → 2H₂O
2Na + Cl₂ → 2NaCl
2CaCO₃ → 2CaO + CO₂
2CaCO3 =2CaO+CO2 is balanced but we can change 2CaCO =2CaO3+C03
Find the hydrogen ion concentration of a saturated solution of calcium hydroxide whose ph is 13. 1
The pH of the solutions is 12.67.
What is pH of a Solution?
pH is the measurement of how acidic or basic a solution is. The range of pH values is from 0 to 14. Lower pH values mean higher acidity, while higher pH means higher basicity. If the pH value is equal to 7, then the solution is neutral.
To calculate the pH of the solution, a few approaches are possible. Here, the pOH of the solution is calculated first using the molar concentration of [tex]OH^{-1}[/tex] ions. Because pH + pOH = 14, the pH of the solution can then be calculated by subtracting pOH from 14.
Because 2 moles of [tex]OH^{-1}[/tex] ions are formed per mole of [tex]Ca(OH)_{2}[/tex]dissolved, the pOH of a saturated [tex]Ca(OH)_{2}[/tex] solution at [tex]20^{.C}[/tex] is,
Concentration ([tex]C_{OH}[/tex]) of [tex]OH^{-1}[/tex] ions,
[tex]C_{OH}[/tex] = 0.02335 mol [tex]Ca(OH)_{2}[/tex]/L X 2 mol [tex]OH^{-1}[/tex] /1 mol [tex]Ca(OH)_{2}[/tex]
[tex]C_{OH}[/tex] = 0.0467 mol [tex]OH^{-1}[/tex]/L
*pOH of saturated [tex]Ca(OH)_{2}[/tex] solution,
pOH = -log [[tex]C_{OH}[/tex]]
pOH = -log [0.0467 mol [tex]OH^{-1}[/tex]/L ]
pOH = 1.33
*pH of saturated [tex]Ca(OH)_{2}[/tex] solution,
pH = 14 - 1.33
pH = 12.67
Hence, the pH of the solutions is 12.67.
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A reactant and a product of nuclear fission.
A. Neutron
B. Gamma
Answer:
Neutron
Explanation:
Why is Joe Viskocil not a fan of big explosions?
Joe Viskocil is not a fan of big explosions because it is is either lopsided or squashed and not spherical.
What is Explosion?This is defined as a sudden, violent burst of energy which is associated with a rapid expansion of volume.
Joe Viskocil doesn't like big explosions because it is is either lopsided or squashed. and capable of creating more damage.
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How many moles of neon (Ne) gas have a volume of 0.84 L and a pressure of
4.6 atm at 222 K?
(The universal gas constant is 0.0821 L.atm/mol.K.)
A. 4.7 mol
B. 0.010 mol
C. 0.21 mol
D. 70. mol
The amount of Neon gas with the given volume and at the given temperature and pressure is 0.21 mol.
Option C) 0.21 mol is the correct answer.
What is Ideal Gas Law?The Ideal gas law or general gas equation emphasizes on the state or behavior of a hypothetical ideal gas. It states that "the pressure multiplied by volume is equal to moles multiply by the universal gas constant multiply by temperature.
It is expressed as;
PV = nRT
Where P is pressure, V is volume, n is the amount of substance, T is temperature and R is the ideal gas constant ( 0.08206 Latm/molK )
Given that;
Volume of the gas V = 0.84LPressure P = 4.6atmTemperature T = 222KUniversal gas constant R = 0.0821 Latm/molK Amount of gas n = ?PV = nRT
n = PV / RT
n = ( 4.6atm × 0.84L ) / ( 0.0821 Latm/molK × 222K )
n = ( 3.864Latm ) / ( 18.2262Latm/mol )
n = 0.21 mol
Therefore, the amount of Neon gas with the given volume and at the given temperature and pressure is 0.21 mol.
Option C) 0.21 mol is the correct answer.
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A sample contains 2.2 g of the radioisotope niobium-91 and 15.4 g of its daughter isotope, zirconium-91. how many half-lives have passed since the sample originally formed? half-lives
The number of half-lives that has elapsed since the sample originally formed is 3 half-lives
Data obtained from the questionOriginal amount (N₀) = 15.4 + 2.2 = 17.6 g
Amount remaining (N) = 2.2 g
Number of half-lives (n) = ?
How to determine the number of half-lives that has elapsed2ⁿ = N₀ / N
2ⁿ = 17.6 / 2.2
2ⁿ = 8
2ⁿ = 2³
n = 3
Thus, 3 half-lives has elapsed
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Answer:
3
Explanation:
e2022