Answer:
Explanation:The pi-molecular orbitals in propene (CH3-CH=CH2) are essentially the ... This central carbon thus provides two p-orbitals – one for each pi bond – and these two different p-orbitals have to be perpendicular, leading to a twisted structure as shown: ... It all comes down to where the location of the electron-deficient carbon
Which solute generally creates aqueous solutions with lower freezing points? Explain why this substance has a greater effect on the freezing point.
pls help! ^^
Answer:
The freezing point depression can be calculated using the pure solvent freezing point and the molality of the solution.
At the freezing point, the vapor pressure of both the solid and liquid form of a compound must be equal.
The freezing point of a substance is the temperature at which the solid and liquid forms are in equilibrium.
To reattain equilibrium, the freezing point of the solute and solvent mixture is lowered relative to the original pure solvent.
t-Butyl alcohol (TBA) is an important octane enhancer that is used to replace lead additives in gasoline.
a. True
b. False
Answer:
True
Explanation:
The correct option is - True
What is the percent of Cu in CuSO4?
Which of the following reactions is balanced?
Question 13 options:
A)
Sn2+ + Fe3+ → Sn4+ + Fe2+
B)
Sn2+ + 2Fe3+ → Sn4+ + Fe2+
C)
Sn2+ + 2Fe3+ → Sn4+ + 2Fe2+
D)
2Sn2+ + Fe3+ → 2Sn4+ + Fe2+
The balanced chemical equation among the given reactions is:
Sn²⁺ + 2Fe³⁺ → Sn⁴⁺ + 2Fe²⁺
Therefore, option (C) is correct.
What is the balanced chemical equation?A chemical equation of a reaction can be defined as the representation of a reaction in terms of chemical symbols of the substances used in the given reaction. The number of atoms of substances on the balanced equation is equal on either side of the equation.
According to the law of conservation of mass, while balancing a chemical equation, the total mass (reactant side) should be equal to the total mass (product side) in a chemical equation.
In the given equation, the positive charge on reactant side should be equal to the positive charge on product side.
[tex]Sn^{2+ }+ 2Fe^{3+} \longrightarrow Sn^{4+} + 2Fe^{2+}[/tex]
The two electrons lost by the Sn²⁺ ions get converted into Sn⁴⁺ ions. These two electrons are accepted by two ions of Fe³⁺ and converted into Fe²⁺ ions.
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Many scientists think human cloning is possible, so why haven't we made human clones yet?
Question 5 options:
There is not enough medical supplies to clone a human
Human cloning is extremely controversial and many people believe it is unethical
Scientists have determined that stem cells would not be beneficial to human cloning
The human genome is too complex to clone
Answer:
GIVEN IT'S A MULTI CHOICE QUESTION:
1. False
2. True
3. False
4. True
IF ITS NOT
2
Explanation:
We haven't made human clones because human cloning is extremely controversial and many people believe it is unethical.
What is cloning?Cloning is a genetic technique that can be used to reproduce genetically identical organisms in a laboratory.
Human cloning refers to the generation of genetically identical humans in the laboratory.Human cloning can be considered unethical because a person has the right to have an identity, and the cloning technique faces this principle.In conclusion, we haven't made human clones because human cloning is extremely controversial and many people believe it is unethical.
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What must take place for an ionically bonded substance to melt?
Answer:
Heat reaction
Explanation:
Heat must be applied in order to melt a substance.
Graphite and diamond are both solid forms of the element carbon. Which statement explains
the different properties of these two forms of carbon?
(1) Diamond has ionic bonding and graphite has metallic bonding.
(2) Diamond has metallic bonding and graphite has ionic bonding.
(3) Diamond has a different crystal structure from graphite.
(4) Diamond has carbon atoms with more valence electrons than graphite.
Answer: C diamond has a different crystal structure from graphite
Explanation:
The difference between the properties of two forms of carbon is that
Diamond has a crystal structure different from graphite.
Graphite and Diamond are known as allotropes of Carbon as they have the
same chemical properties but different crystal structure.
Diamonds form a 3 crystal lattice with no flexibility while Graphite are
bonded to sheets which makes them slide easily within one another and
gives it its soft texture.
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which is expected to have a higher boiling point? why? CH3CH2OH or CH3CH2NH2
Answer:
Explanation: Ethanol, CH3CH2OH, has the highest of the three boiling points because it has the strongest dipole–dipole forces between molecules due to hydrogen bonding. ... Dimethyl ether, CH3OCH3, has the second- highest boiling point because it has dipole–dipole forces between molecules.
The question is on the picture
Nitrogen reacts with Hydrogen to form Ammonia gas by Haber's Process.
N₂ + 3H₂ → 2NH₃
What is Law of conservation of Mass?This law states that Mass can neither be created, nor destroyed and it can just be transformed from one form to another. This law has application as balancing of the reaction.
Balancing of a reaction is done according to the "Law of conservation of mass" and balancing helps in solving stoichiometry questions correctly as if we will not balance the reaction then the quantitative results in a particular question doesn't come correctly.
Balancing of a reaction helps in mole concept as well and it is one of the laws of chemical reactions as well.
Some examples of balanced chemical reaction are-
2Mg(s) + O₂(g) ⟶ 2MgO(g)
According to the given picture,
Correct option is C. It consists 1 molecule of Nitrogen gas, 3 moles of Hydrogen gas and 2 moles of Ammonia gas.
Therefore, Nitrogen reacts with Hydrogen to form Ammonia gas by Haber's Process.
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Carbon dioxide is released into the atmosphere by _____.
1. denitrification
2. photosynthesis
3. fixation
4. respiration
Answer:
4 a minor but very important component of the atmosphere corban dioxide is released through natural processes such as reputation.;
Explanation:
a minor but very important component of the atmosphere corban dioxide is released through natural processes such as reputation
Is carbon moving into the air moving out of the air or both
Answer:
Carbon is moving into the air
pls help i will mark as brainliest
Answer:
ano po ito?? isa po ba itong story
Equation: 2Mg + O2 = 2MgO
If neither reactant is limiting and the reaction goes to completion, the mass of the product should be equal to...
a) the molar mass of the product
b) the sum of the mass of the reactants
c) the mass of oxygen gas
d) the mass of magnesium
Equation: CH4 + 202 CO2 + 2H20
What is the mole ratio between oxygen and methane (CH4)? If you use 15 moles of 02, how many grams of methane would you predict would be needed?
Answer:
2:1
1.2 × 10² g
Explanation:
Step 1: Write the balanced combustion equation
CH₄ + 2 O₂ ⇒ CO₂ + 2 H₂O
Step 2: Establish the appropriate molar ratio
According to the balanced equation, the molar ratio of O₂ to CH₄ is 2:1.
Step 3: Calculate the moles of CH₄ required to react with 15 moles of O₂
We will use the previously established molar ratio.
15 mol O₂ 1 mol CH₄/2 mol O₂ = 7.5 mol CH₄
Step 4: Calculate the mass corresponding to 7.5 moles of CH₄
The molar mass of CH₄ is 16.04 g/mol.
7.5 mol × 16.04 g/mol = 1.2 × 10² g
the moisturizer you see on the mirror in your bathroom after a hot shower is called?
Answer:
Soap that was thrown out
What is the partial pressure of helium gas in a mixture that contains 8.00 grams of helium and 8.60 mol argon gas with a total pressure of 48.0 torr?
Multiple Choice
9.06 torr
15.2 torr
23.1 torr
38.9 torr
Answer:
[tex]P_{He}=9.06torr[/tex]
Explanation:
Hello there!
In this case, we can identify the solution to this problem via the Dalton's rule because the partial pressure of helium is given by:
[tex]P_{He}=x_{He}P_T[/tex]
Whereas the mole fraction of helium is calculated by firstly obtaining the moles and then the mole fraction:
[tex]n_{He}=8.00g\frac{1mol}{4.00g}=2.00mol\\\\ x_{He}=\frac{n_{He}}{n_{He}+n_{Ar}} \\\\ x_{He}=\frac{2.00mol}{2.00mol+8.60mol}\\\\x_{He}=0.189[/tex]
Then, we calculate the partial pressure as shown below:
[tex]P_{He}=0.189 *48.0torr\\\\P_{He}=9.06torr[/tex]
Best regards!
A gas made up of atoms escapes through a pinhole 0.392 times as fast as Ne gas. Write the chemical formula of the gas.
Answer: The chemical formula of the gas is Xenon.
Explanation:
From Graham's law of effusion rates, the rate of effusion of a gas is inversely proportional to the square root of its molar mass.
[tex]\frac{rate_1}{rate_2}=\sqrt{\frac{M_2}{M_1}}[/tex]
Given: Rate of unknown gas = [tex]0.392\times R_{Ne}[/tex]
Putting the values in the formula:
[tex]\frac{rate_X}{rate_{Ne}}=\sqrt{\frac{M_{Ne}}{M_X}}[/tex]
[tex]0.392=\sqrt{\frac{20.17}{M_X}}[/tex]
Squaring both sides:
[tex]0.154=\frac{20.17}{M_X}[/tex]
[tex]M_X=131g/mol[/tex]
As Xenon (Xe) has molar mass of 131g/mol, Thus the chemical formula of the gas is Xenon.
an aluminum kettle weighs 1.05 kg how much heat and joules is required to increase the temperature of this kettle from 23° c to 99° c
Answer:
71820 J
Explanation:
From the question given above, the following data were obtained:
Mass (M) = 1.05 Kg
Initial Temperature (T₁) = 23 °C
Final temperature (T₂) = 99 °C
Heat (Q) required =?
Next, we shall determine the change in temperature. This can be obtained as follow:
Initial Temperature (T₁) = 23 °C
Final temperature (T₂) = 99 °C
Change in temperature (ΔT) =?
ΔT = T₂ – T₁
ΔT = 99 – 23
ΔT = 76 °C
Finally, we shall determine the heat required. This can be obtained as follow:
Mass (M) = 1.05 Kg
Change in temperature (ΔT) = 76 °C
Specific heat capacity (C) of aluminum = 900 J/KgºC
Heat (Q) required =?
Q = MCΔT
Q = 1.05 × 900 × 76
Q = 71820 J
Thus, 71820 J heat energy is required.
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.
what is the name of the product when 3-methyl-2-butanol is oxidized?
Answer:
3-methyl-2-butanone.
Explanation:
Hello there!
In this case, for these types of oxidation of secondary alcohols, due to the 2-butanol, it is possible for us to remember that the product is a ketone exhibiting a carbonyl (C=O) group as the product of the oxidation. In such a way, the reaction would be:
CH3 - CH - CH - CH3 -------> CH3 - C - CH - CH3
| | || |
OH CH3 O CH3
Therefore, the product would be 3-methyl-2-butanone.
Best regards!
Ultrasound waves do not transmit easily through bone. State what you think happens to ultrasound waves when they reach a bone in the body. Give evidence to support your claim and explain your answer.
Answer:
See explanation
Explanation:
Echo is the reflection of sound waves. Recall that ultrasound are also sound waves of high frequency.
When ultra sound meets an obstacle such as a bone, it is reflected backwards and gives rise to an echo back in the transducer.
Since ultrasound is high frequency sound wave wave; It does not passes through bone due to the high density of the bone, the data required may now be collected.
can boron bond with lithium
Answer:
No, they are not able to bond.
Explanation:
Hello there!
In this case, regarding chemical bonds, it is necessary to remember that these come up when a metal is bonded with a nonmetal, or, when two nonmetals get bonded; however, even there exist a type of denominated metallic, it is not eligible for boron and lithium because they tend to stable as cations (positive) and therefore, equal charges are not eligible for bonding, thus, boron and lithium would not be able to bond.
Best regards!
how many moles are in 1.25x10^20 molecules of HF?
Answer:
1.25×10²⁵ molecules of ethane contains 124.56 moles of Hydrogen atoms.
A 10.0-mL sample of sulfuric acid, H2SO4, from a battery of an old car is diluted to 100.0 mL, and a 10.00-mL aliquot (portion) of the diluted acid is then titrated with 0.2500 M NaOH solution. If the concentration of H2SO4 in the original battery was 3.25 M, how many milliliters (mL) of the NaOH solution is required to titrate the sulfuric acid present in the 10.0-mL portion of dilute acid solution
Answer:
26.0 mL
Explanation:
The reaction that takes place is:
H₂SO₄ + 2NaOH → Na₂SO₄ + 2H₂OFirst we calculate the molar concentration of the diluted sulfuric acid solution, using the C₁V₁=C₂V₂ formula:
3.25 M * 10.0 mL = C₂ * 100 mLC₂ = 0.325 MNow we calculate how many H₂SO₄ moles would there be in 10.00 mL of this diluted solution, using the definition of molarity:
0.325 M * 10.00 mL = 3.25 mmol H₂SO₄Then we convert 3.25 mmoles of H₂SO₄ into mmoles of NaOH, using the stoichiometric coefficients of the balanced reaction:
3.25 mmol H₂SO₄ * [tex]\frac{2mmolNaOH}{1mmolH_2SO_4}[/tex] = 6.5 mmol NaOHFinally we calculate the required volume of the NaOH solution, using the definition of molarity:
6.5 mmol NaOH / 0.2500 M = 26.0 mLWhich soil horizon contains the most organic matter?
A horizon
B horizon
C horizon
D horizon
Answer:
I- It says horizon so.....what....wth ._.
Explanation:
By which method the following mixture can be separated?(i)mixture of colours (ii) Minerals oil.
the answer ie the second option
Minerals oil
Which of the following best describes careers that use chemistry?
A. Careers that involve scientific research or chemistry instruction
B. Only careers that involve scientific research
C. Only careers that involve chemical manufacturing
D. A variety of careers in many different industries
Answer:
D
Explanation:
A reaction has activation energy of 85kjper mol. What is the effect on the rate of raising the temperature from 20degree to 30 degree
Answer: The rate increases 3 times on raising the temperature from 20degree to 30 degree
Explanation:
According to Arrhenius equation with change in temperature, the formula is as follows.
[tex]ln \frac{k_{2}}{k_{1}} = \frac{-E_{a}}{R}[\frac{1}{T_{2}} - \frac{1}{T_{1}}][/tex]
where [tex]k_2[/tex] = rate constant at temp [tex]T_2[/tex]
[tex]k_1[/tex] = rate constant at temp [tex]T_1[/tex]
[tex]E_a[/tex]= activation energy
R= gas constant
[tex]T_1[/tex]= temperature = [tex]20^0C=(20+273)K=293K[/tex]
[tex]T_2[/tex]= temperature = [tex]30^0C=(30+273)K=303K[/tex]
[tex]ln \frac{k_{2}}{k_{1}} = \frac{-85\times 1000J/mol}{8.314J/Kmol}[\frac{1}{303} - \frac{1}{293}][/tex]
[tex]ln \frac{k_{2}}{k_{1}}=1.15[/tex]
[tex]\frac{k_{2}}{k_{1}}=3[/tex]
Thus rate increases 3 times on raising the temperature from 20degree to 30 degree
Why is it hard to predict the weather more than a few days in advance?
Answer:
Because the weather is complex and dynamic.
Explanation:
Rain, snow, hail, and sleet are examples of
a
bad weather.
b condensation.
C precipitation.
d evaporation
Answer:
C. Precipitation
It made me put more on my answer.