Answer:
true or false :-
a) yes
b) no
c)yes
d)yes
e)no
For similar analysis times, open tubular columns provide better resolution than packed columns, Packed columns have a greater sample capacity than open tubular columns and Open tubular columns give better resolution but longer analysis separation times compared to packed columns are true regarding open tubular. Hence, options A, C and D are correct.
What is gas chromatography used for?The chemical constituents of a sample mixture are identified, separated, and quantified using an analytical technique called gas chromatography.
Gas chromatography is a technique for separating compounds in mixtures by injecting a gaseous or liquid sample into a mobile phase, which is usually referred to as the carrier gas, and passing the gas through a stationary phase. The mobile phase is often composed of an inert gas or an unreactive gas, such as helium, argon, nitrogen, or hydrogen.
Thus, options A, C and D are correct.
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Which molecule or ion below would be expected to have a trigonal planar electron domain geometry?
a. nitrate ion, NO3 1-
b. at least two of these
c. carbon tetrachloride
d. water
e. sulfur dioxide
Answer:
a. nitrate ion
e. sulfur dioxide
Explanation:
Trigonal planar geometry, is possible, where the combination of atoms or lone pain form a triangle which is is same plane.
Hence, from the given options,
Nitrate ion has a trigonal planar geometry.Carbon tetrachloride has a teterahedral geometrywater has a bent angular geometry.sulfur dioxide has a trigonal planar geometry.Therefore,
From the given options, the correct answer is -
a. nitrate ion
e. sulfur dioxide
Complete the balanced molecular chemical equation for the reaction below. If no reaction occurs, write NR after the reaction arrow. Pb ( N O ₃ ) ₂ (aq) + K I (aq) → ☐⁴⁻ ☐³⁻ ☐²⁻ ☐⁻ ☐⁺ ☐²⁺ ☐³⁺ ☐⁴⁺ 1 2 3 4 5 6 7 8 9 0 ☐₁ ☐₂ ☐₃ ☐₄ ☐₅ ☐₆ ☐₇ ☐₈ ☐₉ ☐₀ + ( ) → ⇌ (s) (l) (g) (aq) NR Pb I N O K Reset
Answer: [tex]Pb(NO_3)_2(aq)+2KI(aq)\rightarrow PbI_2(s)+2KNO_3(aq)[/tex]
Explanation:
A double displacement reaction is one in which exchange of ions take place. The salts which are soluble in water are designated by symbol (aq) and those which are insoluble in water and remain in solid form are represented by (s) after their chemical formulas.
The double displacement reaction in which one of the product is formed as a solid is called as precipitation reaction.
The balanced molecular equation is:
[tex]Pb(NO_3)_2(aq)+2KI(aq)\rightarrow PbI_2(s)+2KNO_3(aq)[/tex]
Buffer sol that contain 1 mol NH4Cl and 1mol NH4OH per liter find PH
Answer: what
Explanation:
What is the estimated life expectancy of tin reserves?
Answer:
chemical reaction hope this helps ;)
Explanation:
The value of the equilibrium constant for a reaction
a. changes with temperature.
b. changes with time.
c. is the same under all conditions.
d. changes with concentration.
Answer:
a. changes with temperature.
Explanation:
Hello there!
In this case, according to the thermodynamic definition of the equilibrium constant in terms of the Gibbs free energy of reaction and the temperature of the system:
[tex]lnK=-\frac{\Delta G}{RT}[/tex]
It is possible to figure out that the equilibrium constant varies as temperature does, not only on the aforementioned definition, but also in the Gibbs free energy as it is also temperature-dependent. Therefore, the appropriate answer is a. changes with temperature.
Best regards!
What is climate? What are three things that cause the earths climate?
Answer:
The climate has been caused by many natural factors including changes in the sun emissions from volcanoes variations in Earth's orbit and levels of carbon dioxide. Global climate change has typically occured very slowly over thousands or millions of years .The three causes of the Earth's climate are
Industrial activitiesAgricultural activitiesDeforestationthese are the causes of the Earth's climate.
Climate is a average weather in a given area for a long period of time is called a climate
maybe this might help ur question
Green plants use light from the Sun to drive photosynthesis, a chemical reaction in which liquid water and carbon dioxide gas form aqueous glucose C6H12O6 and oxygen O2 gas. Calculate the moles of water needed to produce 0.075mol of glucose. Be sure your answer has a unit symbol, if necessary, and round it to the correct number of significant digits
Answer: 0.45 moles of water are needed to produce 0.075mol of glucose.
Explanation:
The balanced chemical reaction is:
[tex]6CO_2(g)+6H_2O(l)\rightarrow C_6H_{12}O_6(aq)+6O_2(g)[/tex]
According to stoichiometry :
1 mole of glucose require = 6 moles of [tex]H_2O[/tex]
Thus 0.075 moles of glucose require = [tex]\frac{6}{1}\times 0.075=0.45[/tex] moles of [tex]H_2O[/tex]
0.45 moles of water are needed to produce 0.075mol of glucose.
If 13.5 L of nitrogen gas reacts with 17.8 L of hydrogen gas at STP, according to the following reaction, what mass of ammonia would be produced? N2 + 3 H2 --> 2 NH3 Report your answer with proper significant figures, only a number answer is required, no units needed for this form.
Answer: N5 + H4 and then do 13.5 * 17.8 then solve so 240.3 divided by 9
Your answer is 26.7 Pretty sure
Explanation: (study)
Answer:
Work is all on the paper
8. Which of the following is TRUE about limiting and excess reactants?
A. The excess reactant will be completely consumed after the reaction is complete
B. The limiting reactant determines the maximum amount of product that can be formed
C. Some of the limiting reactant is left over after the reaction is complete.
D. The reactant that has the largest given mass will be the excess reactant.
The statement which is TRUE about limiting and excess reactants is (B) The limiting reactant determines the maximum amount of product that can be formed.hence the correct option is (B)
What is Limiting reagent ?A reactant that is completely consumed at the end of a chemical reaction is known as the limiting reagent.
Since the reaction cannot proceed without this reagent, the amount of product that can be produced is constrained.
The reactant that is totally consumed during a reaction, or the limiting reagent, decides when the process comes to an end.
The precise quantity of reactant required to react with another element can be estimated from the reaction stoichiometry.
Therefore, The statement which is TRUE about limiting and excess reactants is (B) The limiting reactant determines the maximum amount of product that can be formed.hence the correct option is (B)
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Please help me!!! this is due now
What volume in
L
of a 0.724 M Nal solution contains 0.405 mol of Nal ?
Answer:
[tex]0.5594\ \text{L}[/tex]
Explanation:
Mol of NaI = 0.405 mol
Molarity of solution = 0.724 M
Molarity is given by
[tex]M=\dfrac{\text{mol}}{\text{Volume of solution in }NaI}\\\Rightarrow \text{Volume of solution in }NaI=\dfrac{0.405}{0.724}\\\Rightarrow \text{Volume of solution in }NaI=0.5594\ \text{L}[/tex]
The required volume is [tex]0.5594\ \text{L}[/tex].
Which blood vessels carry blood away from the heart?
veins
arteries
capillaries
Answer:
Arteries
Explanation:
Answer: arteries. :)
Explanation:
the top one is right trust me and i took the test. :)
have agreat day. :)
why cancer is not a pathogen?
Answer:
Because their cells duplicate inside of you not normally!
Explanation:
Hope this helps! Plz mark as brainliest! :)
Four flasks each contain 100 milliliters of aqueous solutions of equal concentrations at 25°C and 1 atm.
KCI
CH3OH
Ba(OH)2
CH3COOH
Which solutions contain electrolytes?
Answer:
KCl and Ba(OH)₂.
Explanation:
Hello there!
In this case, since electrolytes are substances characterized by presence of covalent bonds between the atoms forming the compound, it is possible to realize that just KCl and Ba(OH)₂ as they are species composed by cations (K and Ba) and anions (OH and Cl); therefore, they have the capacity to get ionized in aqueous solution and thus transfer electricity when present.
Best regards!
The solution containing electrolytes is the flask of KCI and [tex]Ba(OH)_2[/tex].
The correct options are a and c.
What is an electrolyte?An electrolyte is a medium that contains ions and conducts electricity through the movement of ions, but not electrons.
They are minerals present in the body, that are electrically charged.
Electrolytes help in maintaining the water balance in the body, and pH of the body.
The three primary electrolytes are sodium, potassium, and chloride.
Thus, the correct options are a, KCI, and b, [tex]Ba(OH)_2[/tex].
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Please help me I’m not sure with that
Answer:
i cant see the picture sorry
Explanation:
Answer fast please?????????????
Answer:
option a. iron,copper, aluminium.
What volume, in milliliters, of a 0.140 M solution of KCl contains 2.65 g of the compound?
Express the volume to three significant figures and include the appropriate units.
Answer:
Calculate moles KCl: 2.55 g / 74.55 g/mol = 0.0342 moles KCl
Volume KCl = 0.0342 mol X (1 L/0.150 mol) = 0.228 L X 1000 mL/L = 228 mL
Explanation:
Volume=288mL
Given:
Molarity=0.140 M
Mass=2.65 g
To find:
Volume=?
Molar mass of KCl = 74.55 g/mol
Firstly, we need to calculate the number of moles of KCl:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}} \\\\\text{Number of moles}=\frac{2.65g}{74.55g/mol} \\\\\text{Number of moles}=0.0355 moles[/tex]
In order to calculate the volume,
[tex]\text{ Volume of KCl} = 0.0342 mol * (1 L/0.150 mol) \\\\\text{ Volume of KCl} = 0.228 L * 1000 mL/L \\\\\text{ Volume of KCl} = 228 mL[/tex]
The volume in mL will be 228mL.
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#12 don’t understand need help significantly
C. 8.80 mol H₂
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Reading a Periodic TableMolesStoichiometry
Using Dimensional AnalysisAnalyzing Reactions RxNExplanation:Step 1: Define
[RxN - Balanced] N₂ (g) + 3H₂ (g) → 2NH₃ (g)
[Given] 100 g 2NH₃
[Solve] moles H₂
Step 2: Identify Conversions
[RxN] 2 mol NH₃ (g) → 3 mol H₂ (g)
[PT] Molar Mass of N - 14.01 g/mol
[PT] Molar Mass of H - 1.01 g/mol
Molar Mass of NH₃ - 14.01 + 3(1.01) = 17.04 g/mol
Step 3: Stoich
[DA] Set up conversion: [tex]\displaystyle 100 \ g \ NH_3(\frac{1 \ mol \ NH_3}{17.04 \ g \ NH_3})(\frac{3 \ mol \ H_2}{2 \ mol \ NH_3})[/tex][DA] Multiply/Divide [Cancel out units]: [tex]\displaystyle 8.80282 \ mol \ H_2[/tex]2. A spider builds his web in the horns of a deer. What is the symbiotic
relationship?
I point
O MUTUALISM
COMMENSALISM
PARASITISM
O Other
Answer:
COMMENSALISM
Explanation:
Commensalism refers to the relationship that exists between two different organism that belong to different species. In this relationship neither of the organisms are harmed while either of them is benefitted. The web made by the spider between the horns of the deer increases the probability of the spider to catch its prey. The random movement of the deer helps the spider and at the same time it do not harm the deer.
which statements describe the relationship between the area and the bioversity
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Which of the following statements about balanced chemical equations is correct?
A.
The products must contain the same numbers and types of atoms as the reactants.
B.
The products must contain the same arrangement of atoms as found in the reactants.
C.
The products must contain the same numbers but not the same types of atoms as the reactants.
D.
The products must contain the same types but not the same numbers of atoms as the reactants.
Answer:A.
The products must contain the same numbers and types of atoms as the reactants.
Explanation: I think this
Answer:a
Explanation:
1. If 3.2 L of nitrogen monoxide and 4.3 g of oxygen gas are combined, what volume of nitrogen dioxide will be formed? 2NO + 0, -> 2NO,
Answer:
[tex]3.2 \div 22.4 = \frac{1}{7} mol \: no[/tex]
[tex]4.3 \div 32 = 0.134mol \: o2[/tex]
Explanation:
NO is limit reactant so:
1÷7×46=6.57 grams of NO2 will form
If a 130-kg car is traveling at a velocity of 23 m/s, what is the kinetic energy of the car?
Kinetic energy is the amount of energy present in the object due to motion. It is required by the body for action and motion. The kinetic energy of the car is 34385J.
What is kinetic energy?Kinetic energy is a type of energy that is directly proportional to the mass of the object and the square of the velocity. The formula for the kinetic energy can be given as,
[tex]\rm KE = \dfrac{1}{2}mv^{2}[/tex]
Here,
Mass of the car (m) = 130 kg
Velocity of the car (v) = 23 m/s
Substituting values in the equation:
[tex]\begin{aligned}\rm KE &= \dfrac{1}{2}\rm mv^{2}\\\\&= \dfrac{1}{2}\times 130\times (23)^{2}\\\\&= 34385\;\rm J\end{aligned}[/tex]
Therefore, 34385J is the kinetic energy of the car.
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320.0 g of NaCl would contain how many formula units? (Molar mass of
NaCl is 58.44 g/mol) *
Answer:
Formula unit = 32.9746×10²³
Explanation:
Given:
Mass of NaCl = 320 g
Molar mass of NaCl = 58.44 g/mol
Find:
Formula unit
Computation:
Formula unit = [Mass of NaCl / Molar mass of NaCl]Avogadro's number
Formula unit = [320 /58.44]6.022×10²³
Formula unit = 32.9746×10²³
Where are the most reactive nonmetals located on the periodic table?
* Urgent Bet no one knows this *
Answer: The name of the super continent that existed millions of years ago.
Explanation:
Our continents as they exist today were once joined together into a super continent known as Pangea. Over the millennia, the land masses broke off and drifted away creating the location of the continents we know today.
(つ ^‿^ )つ Hey there!
Answer → Is the second answer, The name of the super continent that existed millions of years ago.
✨Hope this helps!✨
what observation helps a poison ivy plant survive in its environment
What is the pH of 2.88*10^-5 M LiOH?
Answer: 9.46
Explanation: in LiOH solution concentration of OH- ions is 2.88·10^-5 M
And pOH = -log( 2.88·10^-5 M) = 4.54. Because PH + pOH = 14.00
Then pH = 14-4.54
#15 need help don’t understand
As a raindrop falls from a cloud to the surface of Earth,
A. its speed increases due to gravity.
B. its speed increases due to air resistance,
C. it moves at a constant speed,
<
OD. it moves at a constant velocity
Answer:
The answer is C!
Explanation:
Hope it helps
Answer D
Explanation: did the quiz ψ(｀∇´)ψ