Answer:
The position of an equilibrium always shifts in such a direction as to relieve a stress applied to the system -Le Chåtelier's principle
A molecule that donates a proton when it encounters a proton acceptor.- Bronsted-Lowry acid
Occurs when a reaction involving an acid and its conjugate base is combined with a second reaction involving a base and its conjugate acid.- Neutralization
It ionizes completely when dissolved in water.- Strong acid
The shift in the position of equilibrium caused by the addition of a participating ion.- Common ion effect
It only partially ionizes when dissolved in water.- Weak electrolyte
It is capable of acting as either an acid or a base depending upon the solute- Amphoteric solvent
The act of self-ionization of a solvent to produce both a conjugate acid and a conjugate base.- Auto-protolysis
A chemical species that bears both positive and negative charges.- Zwitterion
Explanation:
In the answer box we have various chemical terminologies and their definitions. In answering the question, you must carefully read through each definition, then check what option best matches that definition from the options provided.
Each definition applies only to one terminology as you can see in the answer above.
According to the law of superposition, where would you find objects with an older relative age?
Answer:
The law of superposition states that each rock layer is older than the one above it. So, the relative age of the rock or fossil in the rock is older if it is farther down in the rock layers.
As part of a soil analysis on a plot of land, a scientist wants to determine the ammonium content using gravimetric analysis with sodium tetraphenylborate, Na+B(C6H5)−4. Unfortunately, the amount of potassium, which also precipitates with sodium tetraphenylborate, is non‑negligible and must be accounted for in the analysis. Assume that all potassium in the soil is present as K2CO3 and all ammonium is present as NH4Cl.
A 5.025 g soil sample was dissolved to give 0.500 L of solution. A 100.0 mL aliquot was acidified and excess sodium tetraphenylborate was added to precipitate both K+ K + and NH+4 ions completely.
Compound Formula mass
B(C6H5)−4+K+⟶KB(C6H5)4(s) KB(C6H5)4 358.33 g/mol
B(C6H5)−4+NH+4⟶NH4B(C6H5)4(s) NH4B(C6H5)4 337.27 g/mol
K2CO3 138.21 g/mol
NH4Cl 53.492 g/mol
The resulting precipitate amounted to 0.277 g. A new 200.0 mL aliquot of the original solution was made alkaline and heated to remove all of the NH+4 as NH3. The resulting solution was then acidified, and excess sodium tetraphenylborate was added to give 0.105 g of precipitate.
Find the mass percentages of NH4Cl and K2CO3 in the original solid.
______ %NH4CL
______ %K2CO3
Answer:
Mass percentage of NH₄Cl = 3.54%
Mass percentage of K₂CO₃ = 1.01%
Explanation:
If a 200.0 mL aliquot produced 0.105 g of KB(C₆H₅)₄, then a 100.0 mL aliquot would produce 1/2 * 0.105 g = 0.0525 g of KB(C₆H₅)₄.
Therefore, mass of NH₄B(C₆H₅)₄ in the 100.0 ml aliquot = (0.277 - 0.0525)g = 0.2245 g
Number of moles of NH₄B(C₆H₅)₄ in 0.2245 g = 0.2245 g/ 337.27 g/mol = 0.0006656 moles
In 500 ml solution, number of moles present = 0.0006656 * 500/100 = 0.003328 moles.
From equation of the reaction; mole ratio of NH₄⁺ and NH₄B(C₆H₅)₄ = 1:1
Similarly, mole ratio of NH₄⁺ and NH₄Cl = 1:1
Therefore, moles of NH₄Cl in 500 ml sample = 0.003328 moles
Mass of NH₄Cl = 0.003328 mol * 53.492 g/mol = 0.178 g
Mass percentage of NH₄Cl = (0.178/5.025) * 100% = 3.54%
Number of moles of KB(C₆H₅)₄ in 0.105 g (precipitated from 200.0 ml aliquot) = 0.105 g/ 358.33 g/mol = 0.000293 moles
In 500 ml solution, number of moles present = 0.000293 * 500/200 = 0.0007326 moles.
From equation of the reaction; mole ratio of K⁺ and KB(C₆H₅)₄ = 1:1
Similarly, mole ratio of K⁺ and K₂CO₃ = 2:1
Therefore, moles of K₂CO₃ in 500 ml sample = 0.0007326/2 moles = 0.0003663 moles
Mass of K₂CO₃ = 0.0003663 mol * 138.21 g/mol = 0.05063 g
Mass percentage of K₂CO₃ = (0.05063/5.025) * 100% = 1.01%
Which element requires the least amount of energy to remove the most loosely held electron from a gaseous atom in the ground state? 1. K 2. Kr 3. As 4.br
Answer:
K
Explanation:
HELPPP
Which of the following pairs of elements is most likely to permanently transfer one or more electrons to the
other element?
a. Chlorine and phosphorus
b. Iron and bromine
c. Tin and lead
d. Nitrogen and oxygen
PLEASE HELP ME ASAP!
Which of the following elements has the highest electronegativity?
A. Ar
B. Ga
C. Ag
D. S
Answer:
its S
Explanation:
Chemistry pick two answers
answer this question
Answer:
The first one
Explanation:
illustrate the respiratory system
I hope this has the information that you need
One differentiating characteristic between vascular and nonvascular plants is the lack of active transport structures in the nonvascular plants. How does the lack of xylem or phloem contribute to the smaller size of the nonvascular plants?
Nonvascular plants are smaller because xylem and phloem help a plant stand up taller.
Nonvascular plants have other transport structures that are microscopic and therefore take up less room.
Nonvascular plants rely upon concentration gradients to move food and water, which only works over small distances.
Nonvascular plants are smaller because they don’t photosynthesize as much as vascular plants and don’t get enough food.
Answer:
One of the most important characteristics of non-vascular plants is the absence of vascular tissues. Non-vascular plants do not have the vascular tissues known as xylem and phloem. ... As they do not have any vascular tissue, they cannot retain water for long time or transport it to other parts of the plant.
Explanation:
Answer:
fern
Explanation:
List the factors that cause low oxygen levels.
Answer:
Common causes of hypoxemia include:
Anemia.
ARDS (Acute respiratory distress syndrome)
Asthma.
Congenital heart defects in children.
Congenital heart disease in adults.
COPD (chronic obstructive pulmonary disease) exacerbation — worsening of symptoms.
Emphysema.
Interstitial lung disease
and many more.....
The mass of 1 gram:
is kept as a standard platinum cylinder in France
equals 1 cm³
is .01 kg
equals the mass of 1 mL of water at 4°C
Answer:
C. equals the mass of 1 mL of water at 4°C
Explanation:
what can i do to change the material like metal clothes line or washing line
I'm not sure bro but i will try for you
can someone please help me? i will give brainliest
The smallest possible particle of an element is a(n)
RE
??
Answer:
An atom is the smallest particle of an element that still has the properties of that element. Atoms, in turn, are composed of subatomic particles, including negative electrons, positive protons, and neutral neutrons. The number of protons in an atom determines the element it represent
Explanation:
Which properties of grains determine the texture of rocks? Check all that apply.
feel
pattern
color
shape
size
I will mark Brainlyest
Answer:
color shape and size
Explanation:
How many total hydrogen atoms are in CH3OOH?
Answer:
4
Explanation:
In CH3OOH, there is H3, which means 3 hydrogen atoms, but there is also an H at the end, which means another hydrogen atom.
3 + 1 = 4
What ingredients can be alternative for cornstarch?
Answer:
their are many alternative for cornstarch.But I know only 10 of them and they are:
1.Rice Flour
2.wheat Flour
3.Potato Starch
4.Arrowroot
5.Tapioca
6.Ground Flaxseeds
7.Gaur Gum
8.Xanthan Gum
9.Glucomannan
10.Xanthan Gum
What are the four main types of tissues in the human body?
Answer:
epithelial tissue, connective tissue, muscle tissue, and nerve tissue
Explanation:
Alison finds the total mass of a sample of baking soda, a balloon, and a glass container with vinegar in it. She adds the baking soda to the vinegar and immediately places the balloon over the mouth of the container.
Answer:
The baking soda and vinegar react to create carbon dioxide, which inflates the balloon.
Explanation:
8 is subtracted from the square of a number.
Answer:
how do I answer without context
What is the density of aluminium? |
एल्यूमीतनयम का घनत्व कतना होता है?
A : 2.7 g/cm3 | 2.7 g/cm3
B : 3.7 g/cm3 | 3.7 g/cm3
C : 4.7 g/cm3 | 4.7 g/cm3
D : 5.7 g/cm3 | 5.7 g/cm3
Ans: A : 2.7 g/cm3 | 2.7 g/cm3
Answer:
answer 2.7
Explanation:
a.2.7g/cm3
__Hgo > __Hg + __O2?
Hg + O2 → HgO
✅Word equation: Mercury + Oxygen gas → Mercury (II) oxide
✅ Type of Chemical Reaction: For this reaction we have a combination reaction.
✅ Balancing Strategies: To balance this equation it's probably easiest to begin by changing the coefficient in front of the HgO.
This is a combination reactions because the mercury (Hg) plus the oxygen gas (O2) come together to form the Mercury (II) oxide (MgO).
Hint-1
Hint-2
IamSugarBee
Write a balanced equation for each of the acid-base reaction given below.a. Aqueous sulfuric acid with aqueous potassium hydroxide.
Answer:
H2SO4 + 2KOH => K2SO4 + 2H2O
Explanation:
The acid-base reaction is a type of chemical reaction that involves the exchange of hydrogen ions.
The acid-base reaction between aqueous sulfuric acid ( H2SO4 ) and aqueous potassium hydroxide (KOH) is a neutralization reaction that results in potassium sulfate and water.
sulfuric acid + potassium hydroxide => potassium sulfate + water
So, the balanced equation for this reaction is as follows:
H2SO4 + 2KOH => K2SO4 + 2H2O
Hence, the correct answer is "H2SO4 + 2KOH => K2SO4 + 2H2O".
The water cycle would not be possible without ______ and ________.
a. evaporation; condensation
b. gravity; sun
c. precipitation; rain
d. gravity; precipitation
297.85
Question 2
4 pts
If a sample of gas occupies 23.5 mL at 315 K and 14.8 atm of pressure, what volume will it occupy at 415 K and
12.3 atm?
Give your volume in ml, but do not include the units in the answer. Do not use scientific notation.
Question 3
4 pts
Answer:
37.25
Explanation:
[tex]P_1[/tex] = Initial pressure = [tex]14.8\ \text{atm}[/tex]
[tex]P_2[/tex] = Final pressure = [tex]12.3\ \text{atm}[/tex]
[tex]V_1[/tex] = Initial volume = [tex]23.5\ \text{mL}[/tex]
[tex]V_2[/tex] = Final volume
[tex]T_1[/tex] = Initial temperature = [tex]315\ \text{K}[/tex]
[tex]T_2[/tex] = Final temperature = [tex]415\ \text{K}[/tex]
From ideal gas law we have
[tex]PV=nRT[/tex]
[tex]\Rightarrow PV\propto \dfrac{1}{T}[/tex]
So
[tex]\dfrac{P_1V_1}{T_1}=\dfrac{P_2V_2}{T_2}\\\Rightarrow V_2=\dfrac{P_1V_1T_2}{T_1P_2}\\\Rightarrow V_2=\dfrac{14.8\times 23.5\times 415}{315\times 12.3}\\\Rightarrow V_2=37.25\ \text{mL}[/tex]
The final volume is [tex]37.25\ \text{mL}[/tex]
What is the frequency of a photon of light (in Hz) that has an energy of 2.50 x 10-18 J?
Answer:
The answer is
[tex]3.77 \times {10}^{15} \: \: \: Hz[/tex]
Explanation:
The frequency of the photon can be found by using the formula
[tex]f = \frac{E}{h} \\ [/tex]
where
E is the energy
f is the frequency
h is the Planck's constant which is
6.626 × 10-³⁴ Js
From the question
E = 2.50 × 10^-18 J
So we have
[tex]f = \frac{2.50 \times {10}^{ - 18} }{6.626 \times {10}^{ - 34} } \\ [/tex]
We have the final answer as
[tex]3.77 \times {10}^{15} \: \: \: Hz[/tex]
Hope this helps you
Lily feels tired and weak in the evenings after work. Before starting her chores, she eats dinnner. Which characteristic of life does Lily Exhibit?
Answer:
cool
Explanation:
Water is composed of one atom of oxygen and two atoms of
Answer:
Hydrogen.
Explanation:
You've probably seen "[tex]H_{2}0[/tex]" which is the formula for water. It means that there's 2 hydrogen atoms, and one oxygen atom, in one molecule of water.
Hope this helps! Feel free to mark me Brainliest if you feel this helped. :)
Answer:
the answer is H. (hydrogen)
Why do you think the hot red water sank to the bottom?
Answer:
i did this in school :) but Hot water will rise to the top because it is less dence and cold water will sink to the bottom because it is more dence
Explanation:
is beeswax a mineral, a rock or neither
Answer:
niether
Explanation:
Beeswax is neither a mineral nor a rock it is supposed to be a heterogenous mixture.
What are minerals?
Minerals are defined as a chemical compound which has a well -defined composition and possesses a specific crystal structure.It occurs naturally in the pure form.
If a compound occurs naturally in different crystal structure then each structure is considered as a different mineral.The chemical composition of a mineral varies depending on the presence of small impurities which are present in small quantities.
Some minerals can have variable proportions of two or more chemical elements which occupy equivalent position in the crystal structure.It may also have variable composition which is split into separate species.
Physical properties of minerals include color,streak, luster,specific gravity and cleavage.
Learn more about minerals,here:
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