Chemistry College
Answers
Answer 1
Answer:
B
Explanation:
Answer 2
Answer:
xylem
Explanation:
Related Questions
Mg(s) + Cu(NO3)2(aq) → Mg(NO3)2(aq) + Cu(s)
How will the rate of the chemical reaction change if the solid piece of magnesium metal is ground into a powder?
Select one:
a. Increase
b. Cannot be predicted
c. Will not change
d. Decrease
Answers
Answer: increase
Explanation: when Mg is powder it has greater surface area and
Reaction occurs faster
What is a similarity between a fish embryo and a human embryo in the late stages of development?
They both have tails
They both have gills.
They both have spines.
They both have arms.
Answers
They both have gills
Answer:In the LATER stages of development they would have a spine
Explanation:
A pair of molecular orbitals is formed by.
Answers
“Bonding molecular orbitals are formed by... in-phase combinations of atomic wave functions, and electrons in these orbitals stabilize a molecule.”
Which compound is more soluble in water at 25°C?
A.
MgF2 (Ksp = 5.2 x 10-11)
B.
SrF2 (Ksp = 7.9 x 10-10)
C.
AgBr (Ksp = 5.0 x 10-13)
D.
Agl (Ksp = 1.5 * 10-16)
Answers
Answer:
B
Explanation:
The solubility depends on the ksp. As the value of ksp increases the compound becomes more and more soluble.
In the options, the highest ksp value is 10^-10, thus that one is the most soluble.
13. An aerosol spray can of deodorant with a volume of 0.410 L contains 3.0 g of propane gas (CH3) as propellant. What is the pressure in the can at 20°C? VRT 3. og festa
Answers
Answer: The pressure in the can is 4.0 atm
Explanation:
According to ideal gas equation:
[tex]PV=nRT[/tex]
P = pressure of gas = ?
V = Volume of gas = 0.410 L
n = number of moles = [tex]\frac{\text {given mass}}{\text {Molar mass}}=\frac{3.0g}{44.1g/mol}=0.068mol[/tex]
R = gas constant =[tex]0.0821Latm/Kmol[/tex]
T =temperature =[tex]20^0C=(20+273)K=293K[/tex]
[tex]P=\frac{nRT}{V}[/tex]
[tex]P=\frac0.068mol\times 0.0820 L atm/K mol\times 293K}{0.410L}=4.0atm[/tex]
Thus the pressure in the can is 4.0 atm
When optically active (S)-2-methylcyclopentanone is treated with an acid (H3O ), the compound loses its optical activity. Explain this observation and draw a mechanism that shows how racemization occurs. For the mechanism, draw the curved arrows as needed. Include lone pairs and charges in your answer. Do not draw out any hydrogen explicitly in your products. Do not use abbreviations such as Me or Ph.
Answers
Answer:
See explanation
Explanation:
When (S)-2-methylcyclopentanone is treated with an acid, the carbonyl oxygen atom is protonated.
This leads to the emergence of a positive charge on the cabonyl oxygen. Then the C=O bond is now transformed into H-C-OH where C is a carbocation which leads to a racemic mixture. Loss of a proton from the adjacent carbon atom completes the mechanism.
In this process, the optically active (S)-2-methylcyclopentanone is converted to a pair of diastereomers thereby loosing its optical activity.
An iron sulfide compound is analyzed, and found to contain 11.26 g iron and 9.70 g sulfur. Determine the molar ratio of sulfur to iron in this compound, and hence its chemical formula.
Answers
Answer:
Molar ratio = 1.5Chemical formula = Fe₂S₃
Explanation:
First we convert the given masses of each element into moles, using their respective molar masses:
Fe ⇒ 11.26 g ÷ 55.845 g/mol = 0.202 mol FeS ⇒ 9.70 g ÷ 32.065 g/mol = 0.302 mol S
Now we divide them in order to calculate the molar ratio of S to Fe:
0.302 / 0.202 = 1.5
Meaning that for each 1 Fe mol, there's 1.5 S moles. We can write that as Fe₁S₁.₅
Finally we double those subscripts so that they become the lowest possible integers: Fe₂S₃.
Help this is for marks, who ever answers get brainliest
Answers
Answer:
Coal
Explanation:
thx for points :D
Answer:
Coal
Explanation:
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A chemist has a sample of 1.88 M HCl. What volume of the sample does he require to prepare 200 mL of 0.45 M HCl?
Answers
Answer: v = 200 ml · 0.45 M/ 1.88 M
Explanation: when solution is diluted, amount of substance
is same and n= c · V v1 = v2 · c2 / c1
The appropriate answer is "47.87 mL".
Given values are:
Concentration of undiluted HCl, [tex]C_1=1.88 \ M[/tex]Concentration of diluted HCl, [tex]C_2=0.45 \ M[/tex]Volume of diluted HCl, [tex]V_2=200 \ mL[/tex]
By using the dilution equation, we get
→ [tex]C_1V_1=C_2V_2[/tex]
or,
→ [tex]V_1=\frac{C_2V_2}{C_1}[/tex]
By substituting the given values, we get
→ [tex]=\frac{0.45\times 200}{1.88}[/tex]
→ [tex]=\frac{90}{1.88}[/tex]
→ [tex]= 47.87 \ mL[/tex]
Thus the above answer is correct.
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what is molecular attraction? Am I right?
Answers
Answer:
tendency of molecules with unlike electrical charges to attract each other.
Explanation:
The mass ratio of H to O in water (H2O) is 1:8. What is the mass
ratio of H to O in hydrogen peroxide (H2O2)?
Answers
Answer: 1:16
Explanation:
A buffered solution is made by adding 50.0g NH4Cl to 1.00 L of a 0.75M solution of NH3. Calculate the pH of the final solution. (assume no volume change).
Answers
Answer:
9.15
Explanation:
To solve this problem we'll use Henderson-Hasselbach's equation:
pH = pKa + log[tex]\frac{[A^-]}{[HA]}[/tex]
For this problem:
pH = 9.25 + log[tex]\frac{[NH_3]}{[NH_4Cl]}[/tex]
Now we calculate [NH₄Cl], first by converting 50.0 g of NH₄Cl into moles using its molar mass:
50.0 g NH₄Cl ÷ 53.491 g/mol = 0.935 mol
Meaning that [NH₄Cl] = 0.935 mol / 1.00 L = 0.935 M
Finally we calculate the pH:
pH = 9.25 + log[tex]\frac{0.75M}{0.935 M}[/tex] = 9.15
The pH can be defined as the hydrogen ion concentration in the solution. The pH of ammonium chloride solution in ammonia is 9.16.
What is molarity?
The molarity is the moles of a compound in the liter of solution. The molarity of 50 grams ammonium chloride in a liter of solution is given as:
[tex]\rm Molaity=\dfrac{mass}{molar\;mass\;\times\;volume(L)} \\\\NH_4Cl\;Molarity=\dfrac{50\;g}{53.491\;g/mol\;\times\;1\;L} \\\\NH_4Cl\;Molarity=0.935\;M[/tex]
The ammonia in the solution contributes to the pH from the ammonium chloride salt. The pH can be given as:
[tex]\rm pH=pKa+log\dfrac{acid}{salt}[/tex]
The pKa of ammonia is 9.25. The concentration of ammonia is given as 0.75 M.
The pH of the solution can be given as:
[tex]\rm pH=9.25+log\dfrac{0.75\;M}{0.935}\\ pH=9.25+(-0.09)\\pH=9.16[/tex]
The pH of the solution is 9.16.
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_______ prohibits and punishes certain conduct for the benefit of society.
Answers
Answer:
animal
Explanation:
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Solution Mass of NaCl (9) Volume of water (mL)
A
5.0
50.0
B
5.0
75.0
с
5.0
100.0
D
5.0
125.0
Which of the solutions has the highest salt concentration?
O A Solution B
B. Solution A
O
C. Solution C
D. Solution D
Answers
Divide the volume of water with mass of salt and multiply with 100 you'll get the concentration percentage
answer is B, because solution A's percentage is 10%
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Advise a friend who responds to conflict by using the strategies below on why
each (strategy) is not healthy for sustaining positive relationships.
a. Confrontation
Answers
Answer:
When there is a conflict and if a friend responding to conflict with confrontation it may affect positively or negatively both ways depend how he responds or confront the other person he has a conflict with. But normally people alienate with the person being confrontational. A friend should try to resolve the conflict by making an amicable solution.
if it is used correctly it could help in making the relationship strong, however, confronting by attacking them verbally, insult them, or talking loudly among the group of people can escalate the conflict.
I will advise him to be cautious of the approach as it may positively or negatively affect the situation.
What is Confrontation?
This is the process which involves directly engaging one another in the course of a dispute between them.
This method however could either resolve the conflict or worsen it which is why special approach should be taken by being calm and being respectful to the other party involved.
Read more about Confrontation here https://brainly.com/question/1004819
Heat transfer that occurs within or between solid objects is called
Answers
Answer:
conduction
Explanation:
The answer is Conduction
All atoms of a given element are identical in that they have the same number of
a) protons
b) neutrons
c) electrons
Answers
Answer:
A) protons
Explanation:
Protons are what give atoms their elements. If one atom has a differing number of protons from another atom, they will never be the same element.
What is h+ concentration associated with a pH=10.2
A. 10.9
B. 6.3*10^-11
C. 3.1
D. 3.2 * 10^-3
Answers
Answer:
6.3*10^-11
no reasoning i just know thats the answer you dont have to trust me.
Equal masses of aluminum and copper are heated to 100 degree C and placed in water. Which would cause the water to reach the higher temperature? Explain your answer.
Answers
Answer:
copper will reach to higher temperature first.
Explanation:
How many moles of NaHCO3 are in 2.4 x
1024 molecules of NaHCO:?
Answers
Answer:
4.0 moles NaHCO
General Formulas and Concepts:
Math
Pre-Algebra
Order of Operations: BPEMDAS
BracketsParenthesisExponentsMultiplicationDivisionAdditionSubtractionLeft to Right
Chemistry
Atomic Structure
MolesAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.
Stoichiometry
Using Dimensional AnalysisExplanation:
Step 1: Define
[Given] 2.4 × 10²⁴ molecules NaHCO
[Solve] moles NaHCO
Step 2: Identify Conversion
Avogadro's Number
Step 3: Convert
[DA] Set up: [tex]\displaystyle 2.4 \cdot 10^{24} \ molecules \ NaHCO(\frac{1 \ mol \ NaHCO}{6.022 \cdot 10^{23} \ molecules \ NaHCO})[/tex][DA] Divide [Cancel out units]: [tex]\displaystyle 3.98539 \ moles \ NaHCO[/tex]
Step 4: Check
Follow sig fig rules and round. We are given 2 sig figs.
3.98539 moles NaHCO ≈ 4.0 moles NaHCO
A chemical reaction causes the chemical compositions of substances to change.
a. True
b. False
Answers
Answer:
True
Explanation:
A chemical change is otherwise known as a chemical reaction. A chemical change is characterized by the formation of new substances, evolution of heat and change in chemical composition of substances. The change in the composition of substances during a chemical change is the result of the making and breaking of chemical bonds during a chemical change.
A chemical change is not easily reversible because it involves changes in chemical composition of substances.
An example of a chemical change is the combination of sodium hydroxide and hydrochloric acid according to the reaction equation;
HCl(aq) + NaOH (aq) -----> NaCl(aq) + H2O (l)
We easily notice the change in the chemical composition of each of the substances involved in the reaction.
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Answers
Explanation:
heyyyyyyyyy how are you sure
What type of solution would have a pH of 8 ?
Answers
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Answer: Weak base
Explanation:
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Answer and Explanation:
Solutions that have a pH of 8 would be considered a Weak Base.
This is because a weak base is a base that, upon dissolution in water, does not dissociate completely.
Solutions/liquids that have a pH higher than a pH of 7 are basic solutions, while solutions/liquids that have a pH lower than a pH of 7 are acidic solutions.
When the pH level is closer to 7, it is weak, and when it is far from 7, like if it is 1 or 12, then it is a strong acid/base.
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In the reaction 2 H, Ł02 → 2 H, O, what is the mole ratio of hydrogen to water?
A 2:2
B 2:1
C 1:2
D 4:4
Answers
A
because both have 2's in front of them
HELP FAST 100 PTS Calculate the amount of heat needed to lower the temperature of 50.0g of ice from -40 °C to -100 °C.
Answers
It would be -20 I think not sure
Answer:
[tex]\Large \boxed{\sf -6000 \ J}[/tex]
Explanation:
Use formula
[tex]\displaystyle \sf Heat \ (J)=mass \ (kg) \times specific \ heat \ capacity \ (Jkg^{-1}\°C^{-1}) \times change \ in \ temperature \ (\°C)[/tex]
Specific heat capacity of ice is 2,000 J/(kg °C)
Substitute the values in formula and evaluate
[tex]\displaystyle \sf Heat \ (J)=0.05 \ kg \times 2000 \ Jkg^{-1}\°C^{-1} \times (-100\°C-(-40 \°C))[/tex]
[tex]Q=0.05 \times 2000 \times (-100-(-40)) =-6000[/tex]
Which contains the greatest number of moles of oxygen atoms?
Answers
Answer:
B. OR C.
Explanation:
So, 1 mol of ethanol, C2H5OH contains 1 mol of atoms of O; 1 mol of formic acid, HCO2H contains 2 moles of atoms of O; and 1 mol of water, H2O contains 1 mol of atoms of O.
Answer: So, of the three compounds given, formic acid, HCO2H, contains the greatest number of moles of oxygen atoms.
Why is the spot of drink placed above the water line at the start of the process
Answers
This is the answer. Hope this helps!
Make sure the area is higher than the solvent because if it isn't, the solvent will just wash it into the solution.
What is chromatography?
Chromatography is defined as a technique for separation in which the analyte is mixed with a liquid or gaseous mobile phase and pushed through a stationary phase. Chromatography is a crucial biophysical method that makes it possible to separate, distinguish, and purify mixture's constituent parts for qualitative and quantitative study.
The sample may be lifted with more force thanks to the solvent, which also causes the sample to dissolve. Because of this, the start line in chromatography should always be above the solvent. To avoid getting an angled solvent front, it is crucial to ensure that the solvent is level and not at an angle.
Thus, make sure the area is higher than the solvent because if it isn't, the solvent will just wash it into the solution.
To learn more about chromatography, refer to the link below:
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The answer for this
Answers
it should be c since the
4.50 g of Nacl react with 10.00 g of Agno3 to produce 7.93 g of Agcl.if the theroretical amount of agcl that can be formed is 8.43 g what is the percent yield
Answers
Answer: 94.07%
Explanation:
Percentage yield can be calculated by the formula
%yield = Experimental yield/Theoretical yield x100
Experimental yield = 7.93g
Theoretical yield = 8.43
%yield = Experimental yield/Theoretical yield x100
%yield = 7.93/8.43 x 100 = 94.07%
Ethanol in the body is oxidized to acetaldehyde by liver alcohol dehydrogenase (LADH). Other alcohols are also oxidized by LADH. For example, methanol, which is mildly intoxicating, is oxidized by LADH to the quite toxic product of formaldehyde. The toxic effects of ingesting methanol (a component of many commercial solvents) can be reduced by administering ethanol. The ethanol acts as a competitive inhibitor of methanol by displacing it from LADH. This provides sufficient time for the methanol to be harmlessly excreted by the kidneys. If an individual has ingested 30 mL of methanol (a lethal dose), how much 100 proof whiskey (50% ethanol by volume) must be imbibed to reduce the activity of her LADH towards methanol to 5% of its original value? The adult human body contains ~40L of aqueous fluids throughout which ingested alcohols are rapidly and uniformly mixed. The densities of ethanol and methanol are both 0.79 g/cm3. Assume the KM values of LADH for ethanol and methanol to be 10-3 M and 10-2 M, respectively, and that Ki = KM for ethanol
Answers
Answer: The changes are the mL of methanol ingestion (30mL) and the proof of the whiskey (40% ethanol; 80 proof), and the percentage of reduction (1%). I applied the formulas from the last post in reference to this question but am completely lost. The formulas used last time were: 2. Formulas Applied alpha=1 + ([etOH]/KetOH) (V[meOH]/V[etOH])= (Vmax*[meOH]/KmeOH+[meOH])/(Vmax*[meOH]/alpha*KmeOH+[meOH]) which reduces to (V[meOH]/V[etOH])=(alpha*KmeOH+[meOH])/(KmeOH+[meOH]) 3. My attempt Molarity of methanol: 30mL; which equates to 23.7g of methanol; in 40L that is equal to 0.5925 g/L Dividing the molecular weight by 32.04g/mol I get 0.0184925 which is approximately 0.02M; Km is 0.01M Since the molar mass of methanol and ethanol are two fold, I can multiply the g/l by 4. However, unlike the previous problem, I cannot multiply by 2 because I do not have 50% EtOH, so because 40 is less than 50 I assume to multiply by 2.5 yielding: (30mL)(4)(2.5)=300mL 300mL of EtOH to effectively reduce the Methanol to 1%.