Answer: The number of cations are [tex]3.24 \times 10^{22}[/tex] and number of anions are [tex]3.24 \times 10^{22}[/tex] in 6.42 g of KBr.
Explanation:
The molar mass of KBr is (39.10 + 79.90) g/mol = 119.00 g/mol
Now, the dissociation equation for KBr is as follows.
[tex]KBr \rightarrow K^{+} + Br^{-}[/tex]
This means that 1 mole of KBr is forming 1 mole of [tex]K^{+}[/tex] (cation) and 1 mole of [tex]Br^{-}[/tex] (anion).
According to mole concept, 1 mole of every substance contains [tex]6.022 \times 10^{23}[/tex] atoms. Hence, number of cations present in 6.42 g KBr is calculated as follows.
[tex]No. of cations = Moles \times 6.022 \times 10^{23}\\= \frac{mass}{molar mass} \times 6.022 \times 10^{23}\\= \frac{6.42 g}{119.00 g/mol} \times 6.022 \times 10^{23}\\= 3.24 \times 10^{22}[/tex]
As according to the equation, there are equal number of moles of both cation and anions.
This means that the number of anions are also [tex]3.24 \times 10^{22}[/tex].
Thus, we can conclude that the number of cations are [tex]3.24 \times 10^{22}[/tex] and number of anions are [tex]3.24 \times 10^{22}[/tex] in 6.42 g of KBr.
The number of cations and anions present in potassium bromide is 3.24 × 10²².
How we calculate atoms from moles?In one mole of any substance 6.022 × 10²³ atoms of that substance is present and this is known as Avogadro's number.
KBr is a strong electrolyte means it fully dissociates into their constitute ions. So, the number of moles of produced ions is equal to the moles of KBr and dissociation is represented as:
KBr → K⁺ + Br⁻
From this it is clear that 1 mole of cation and 1 mole of anion is produced from 1 mole of KBr. Moles of KBr will be calculated as:
n = W/M, where
W = given mass = 6.42g
M = molar mass = 119
n = 6.42 / 119 = 0.053 moles
No. of cations and anions present in 0.053 moles = 0.053 × 6.022 × 10²³ = 3.24 × 10²².
Hence, 3.24 × 10²² is the no. of cations and anions.
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What is true of a Brønsted-Lowry acid?
A. A Bronsted-Lowry acid donates OHĽions.
B. A Bronsted-Lowry acid donates H+ ions.
C. A Bronsted-Lowry acid donates electrons.
D. A Bronsted-Lowry acid donates a metal
Draw a structural formula for the organic anion (i.e., do not include NH4 ) formed when propanal is reacted with Tollens reagent. Don't forget the charge on the ion.
Answer:
Draw a structural formula for the organic anion (i.e., do not include NH4 ) formed when propanal is reacted with Tollens reagent. Don't forget the charge on the ion.
Explanation:
Aldehydes on reaction with Tollen's reagent(ammonical silver nitrate solution) form carboxylic acids.
The anion formed is a carboxylate ion.
The entire chemical reaction is shown below:
May you please help me solve these three equations?
Please explain your work.
Any spam or link will be reported.
Thank you.
Answer:
1. 12 molecules
2. 10 grams
3. ?
Explanation:
for number one, you simply. multiblu the 02 by 6 an that is 12, the same goes for number two. now for the third one i di not know. i am sorry and i hope this helps.
A spacecraft is traveling at a speed of 2.3 km/sec. It takes 2.5 minutes to pass a small asteroid. how wide is the asteroid (i.e., how far did the spacecraft travel during this time)? Use (distance) = (velocity) x (time)
Answer: The spacecraft traveled 345 km during the given time.
Explanation:
To calculate the distance of spacecraft, we use the equation:
[tex]\text{Velocity}=\frac{\text{Distance}{\text{Time}}[/tex]
We are given:
Velocity = 2.3 km/sec
Time = 2.5 mins = 150 sec (Conversion factor: 1 min = 60 sec)
Putting values in above equation, we get:
[tex]\text{Distance}=(2.3km/s\times 150s)=354km[/tex]
Hence, the spacecraft traveled 345 km during the given time.
What is temperature?
Answer:
Temperature is a physical quantity that shows how hot and cold something is.
It is the sign of thermal energy, present in all matter, which is the source of the occurrence of heat, a flow of energy when a body is in contact with another that is colder or hotter. Temperature is measured with a thermometer.
Carbon 14 and carbon 12 are both isotopes of the element carbon check all answers that are true about them
Answer:
CARBON 14 INCLUDES:
-six protons
-eight neutrons in the nucleus
CARBON 12 INCLUDES:
-six protons
-Six neutrons
A solution prepared by dissolving 171 mg of a sugar (a molecular compound and a nonelectrolyte) in 1.00 g of water froze at -0.930°C. What is the molar mass of this sugar? The value of Kf is 1.86°C/m.
Answer:
The appropriate answer is "342 g/mol".
Explanation:
Given:
Freezing point,
= 0.93°C
Kf,
= 1.86°C/m
Mass,
= 171
As we know,
⇒ [tex]Freezing \ point = Kf\times molality[/tex]
[tex]0.93=1.86\times molality[/tex]
[tex]Molality=\frac{0.93}{1.86}[/tex]
[tex]=0.5 \ m[/tex]
Now,
⇒ [tex]Molality=\frac{moles \ of \ sugar}{mass \ of \ water}[/tex]
[tex]0.5=\frac{moles \ of \ sugar}{0.01}[/tex]
[tex]moles \ of \ sugar=0.0005 \ mol[/tex]
hence,
The molar mass of the sugar will be:
= [tex]\frac{mass}{moles}[/tex]
= [tex]\frac{171\times 10^{-3}}{0.0005}[/tex]
= [tex]342 \ g/mol[/tex]
how many milliliters of 0.105 M HCL are needed to titrate 22.5 ml of 0.118 M NaOH to the equivalence point
Which diagram(s) represents the bonding pattern of
metals?
O A and B
O C and D
O A
ос
Answer:
C and D- Ionic bonding
B- Metallic bond
Explanation:
They show ionic bonding through which metals bond.
B shows metallic bonding
The pressure exerted by a gas container depends on
Calculate the pH of a solution that is 0.205M benzoic acid and 0.230M sodium benzoate, a salt whose anion is the conjugate base of benzoic acid. (The pKa of benzoic acid
Answer:
pH = 4.25
Explanation:
A solution composed of a weak acid and its conjugate base is a buffer solution. To calculate the pH of a buffer solution we use the Henderson-Hasselbach equation:
pH = pKa + log ([conjugate base]/[weak acid]
In this case, we have the following data:
[conjugate base] = [sodium benzoate] = 0.230 M
[weak acid] = [benzoic acid] = 0.205 M
The pKa of benzoic acid is 4.2. So, we introduce the data in the equation:
pH = 4.2 + log (0.230 M/0.205 M) = 4.2 + 0.050 = 4.25
Which of the following is NOT a property of alkanes?
a)
The boiling point increases as the number of carbons in the compound
increases
b) They are unreactive under standard conditions
C) They have weak intermolecular attractions
d) They are soluble in water
Answer:
D
Explanation:
because alkanes don't dissolve in water. They are insoluble.
. A 60.0 g piece of Zn at 20.0 o C is dropped into 200.0 g of water at 100.0 o C. Determine the final temperature reached by the Zn and water, knowing that the specific heat capacity of Zn and water are 0.389 J/(g.o C) and 4.184 J/(g.o C), respectively.
Answer:
97.8 C
Explanation:
Recall the equation for specific heat:
q = mcΔT
There are several things to know in order to answer this question:
1. Whatever heat energy one object gains is the same as the heat energy the other has lost (conservation of energy).
2. Since one substance loses heat and the other gains heat, you need to multiply one side by -1 to account for the opposite direction of heat transfer.
3. The final temperature of both substance will be the same (zeroth law of thermodynamics)
Below, the left side of the equation represents water and the right side represents zinc.
-1 x 200 x 4.184 x (T - 100) = 60 x 0.389 x (T - 20)
Solve this equation and you get T = 97.8.
At about what age does basal metabolic rate begin to gradually decrease?
15
25
30
45
Answer:
at age 15 the BMR begin to gradually decrease
HELP ASAP!!! if 600.0 grams HF reacts with excess SiO2, how many grams of H2O are produced? Use the following molar masses: HF= 20.01g
H2O=18.02g
Show work.
Answer: The mass of water produced is 180.02 g
Explanation:
The number of moles is defined as the ratio of the mass of a substance to its molar mass.
The equation used is:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex] ......(1)
Given mass of HF = 600.0 g
Molar mass of HF = 20.01 g/mol
Plugging values in equation 1:
[tex]\text{Moles of HF}=\frac{600.0g}{20.01g/mol}=29.98 mol[/tex]
The given chemical equation follows:
[tex]SiO_2+6HF\rightarrow H_2SiF_6+2H_2O[/tex]
By the stoichiometry of the reaction:
If 6 moles of HF produces 2 moles of water
So, 29.98 moles of HF will produce = [tex]\frac{2}{6}\times 29.98=9.99mol[/tex] of water
Molar mass of water = 18.02 g/mol
Plugging values in equation 1:
[tex]\text{Mass of water}=(9.99mol\times 18.02g/mol)=180.02g[/tex]
Hence, the mass of water produced is 180.02 g
If element R has 2 valence electron and element Q has 6 valence electrons, what is the likely compound that will form:
Explanation:
Sydney has been the work that is a great place 56 to be able and a day and day for a week or two types and we will have a very nice time of course but 6yy6667 has 7575665yy44y
Physical weathering can result from the action of all of the following EXCEPT __________.
ice
burrowing by animals
carbon dioxide
plant roots
For the given reaction, what volume of CO2 can be produced from 3.6 L of O2 , assuming an excess of CO ? Assume the temperature and pressure remain constant. 2CO(g)+O2(g)⟶2CO2(g)
2NO(g) + O2(g) ==> 2NO2(g) ... balanced equation
From this balanced equation we see that 2 moles NO reacts with 1 mole O2. At constant pressure and temperature, we can also say that 2 liters of NO reacts with 1 liter of O2. Then we can determine volume of O2 needed to react with 4.8 L of NO as follows:
4.8 L NO x 1 L O2 / 2 L NO = 2.4 L of O2 required
Look at the picture and answer.
Answer:
In order to balance the chemical equation, you need to make sure the number of atoms of each element on the reactants side is equal to the number of atoms of each element on the product side. In order make both sides equal, you will need to multiply the number of atoms in each element until both sides are equal.
Hope this helped you.
(2pts) During the Purification of Lactate Dehydrogenase (LDH) experiment, you will need 50ml of buffer A150. Buffer A150 is 30mM Tris (pH 8.8) and 150mM NaCl. Given 1L of 1.5M Tris and 500ml of 5M NaCl, how much of each stock do you need to make 250ml of the A150 buffer
Answer:
The answer is "[tex]20 \ mL[/tex]"
Explanation:
Given:
Molarity= number of moles
because it is 1 Liter
[tex]\to \frac{0.03\ moles}{1.5 moles}=0.02\ L= 20 \ mL \ of\ Tris\\\\[/tex]
therefore,
it takes 20 mL of Tris.
[tex]\to \frac{0.150 \ moles}{5\ moles} =0.03\ L\\\\[/tex]
[tex]= 30 \ mL \ of\ Nacl[/tex]
So, take [tex]20 \ mL\ of\ NaCl.[/tex]
34. Which type of reaction is represented by the
equation?
CH. + Biz - CH.Br + HB,
A suhstitution
C. esterification
D. polymerization
Answer:
Option A. Substitution
Explanation:
To know which option is correct, let us define each option. This is illustrated below:
A substitution reaction is a reaction in which an halogen replaces hydrogen in a hydrocarbon to produce alkyl halide and the corresponding acid. For example:
RH + X₂ –> RX + HX
NOTE:
R => is an alkyl group
X => is an halogen (F₂, Cl₂, Br₂ or I₂)
Addition reaction is a reaction in which two reactants combined to form a new compound without any loss of the reactants. This reaction is peculiar to only unsaturated hydrocarbon. For example:
CₓHᵧ + A₂ —> ACₓHᵧA
NOTE:
CₓHᵧ => unsaturated hydrocarbon (alkene, alkyne)
A₂ => halogen (F₂, Cl₂, Br₂ or I₂) or HBr, HCl etc
Esterification is a reaction involving carbonxylic and alcohol to produce ester and water. For example:
RCOOH + HOR —> RCOOR + H₂O
NOTE:
R => is an alkyl group
Polymerization is a process of reacting smaller molecules called monomers to form a larger molecule called polymer.
With the information provided above, we can see that the reaction:
CH₄ + Br₂ —> CH₃Br + HBr
Is a substitution reaction since Br replaces H in CH₄ to produce CH₃Br and the corresponding acid i.e HBr
g 10.00 mL of phosphoric acid (H3PO4) are titrated with 0.1000 M sodium hydroxide. 15.00 mL of the sodium hydroxide solution are used in this experiment. Determine the molarity of phosphoric acid.
Answer: The molarity of phosphoric acid is 0.05 M
Explanation:
A neutralization reaction is defined as the reaction in which an acid reacts with a base to form a salt and water molecule.
At equivalence, moles of acid becomes equal to the moles of base. The equation for the neutralization follows:
[tex]n_1M_1V_1=n_2M_2V_2[/tex] ........(1)
where,
[tex]n_1, M_1\text{ and }V_1[/tex] are the n-factor, molarity and volume of acid that is [tex]H_3PO_4[/tex]
[tex]n_2, M_2\text{ and }V_2[/tex] are the n-factor, molarity and volume of the base that is NaOH
Given values:
[tex]n_1=3\\M_1=?M\\V_1=10.00mL\\n_2=1\\M_2=0.1000M\\V_2=15.00mL[/tex]
Plugging values in equation 1:
[tex]3\times M_1\times 10.00=1\times 0.1000\times 15.00\\\\M_1=\frac{1\times 0.1000\times 15.00}{3\times 10.00}\\\\M_1=0.05M[/tex]
Hence, the molarity of phosphoric acid is 0.05 M
A student repeats a reaction several times to test the effects of various
changes on the reaction rate. The data table shows the results. How does
increasing the concentration of the reactants change the reaction rate?
5
Conditions
Reaction Time (5)
10 seconds
Original
Higher concentration
Higher temperature
5 seconds
5 seconds
Metal added
5 seconds
A. Increasing the concentration has no effect on the reaction rate.
B. Increasing the concentration decreases the reaction rate.
C. Increasing the concentration increases the reaction rate.
D. More information is needed to determine what happens to the
reaction rate.
Answer:
The correct answer is - C. Increasing the concentration increases the reaction rate.
Explanation:
In the given question the data with change in different factors affect the rate of reaction differently as it alters the time it takes to complete reaction:
Conditions Reaction Time
Original 10 seconds
Higher concentration 5 seconds
Higher temperature 5 seconds
Metal added 5 seconds
As it is given above, time is decreased in each condition including in the case of increasing the concentration of the reactants which means the rate of reaction increases as well.
How many liters of water would you need to add to 4.36 moles of NaCl to create a 9.4 M solution?
Answer:
0.46 L
Explanation:
In order to solve this problem we need to keep in mind the following definition of molarity:
Molarity = Number of moles / litersWe now input the given number of moles and molarity:
9.4 M = 4.36 mol / litersAnd calculate how many liters are required:
liters = 4.36 mol / 9.4 Mliters = 0.46 LWhich of the following numbers is in scientific notation?
A~ 13.5 x 10^14
B~ 1.35 x 10^14
C~ 1.35 x 9^14
D~ 13.5 x 9^14
HURRRYYY !!!!!
Which of these statements best describe how Kennedy Space Center benefits Florida? It helps to
decrease immigration in Florida.
increase unemployment in Florida.
decrease the income from sale of goods in Florida.
increase Florida's average income per person.
Answer:
The correct answer is - increase Florida's average income per person.
Explanation:
Kennedy Space Center established by NASA helped the boosting economy of Florida. Spaceport operations in Kennedy Space Center benefit Florida by a total economic impact of nearly $4 billion on Florida's economy.
This space center helped in the 7,639 jobs in 2018 and 2019 and 37 new space operation companies. These jobs increased Florida's average income per person above $91,000.
Walking on sand with your bare feet demonstrate what kind of heat transfer
Answer:
It would be conduction.
What mass of zinc (molar mass 65.4 g moll) does it take to produce 0.50 mole of H2(g)?
Answer:
32.7 g of Zn
Explanation:
We'll begin by writing the balanced equation for the reaction. This is illustrated below:
Zn + 2HCl —> ZnCl₂ + H₂
From the balanced equation above,
1 mole of Zn reacted to produce 1 mole of H₂
Next, we shall determine the number of mole of Zn required to produce 0.5 mole of H₂. This can be obtained as follow:
From the balanced equation above,
1 mole of Zn reacted to produce 1 mole of H₂.
Therefore, 0.5 mole of Zn will also react to produce to 0.5 mole of H₂.
Thus, 0.5 mole of Zn is required.
Finally, we shall determine the mass of 0.5 mole of Zn. This can be obtained as follow:
Mole of Zn = 0.5 mole
Molar mass of Zn = 65.4 g/mol
Mass of Zn =?
Mass = mole × molar mass
Mass of Zn = 0.5 × 65.4
Mass of Zn = 32.7 g
Thus, 32.7 g of Zn is required to produce 0.5 mole of H₂.
A diagram representing the levels of organization within an organism is shown below.
Х
-5-
Which level of organization is dentified by X?
(1) cell
(2) tissue
(3) organ
(4) organ system
A diagram representing the levels of organization within an organism is X. The level of organization is identified by X is tissue. Therefore, option 2 is correct.
What is tissue ?The term "tissue" refers to a collection of cells or fluid that cooperate to carry out a particular function in the body. Examples of such cells include those found in the kidney, heart, or blood cells, which transport oxygen to and waste products away from the body's cells.
The Old French term tissue, which means "a ribbon, belt, or piece of woven stuff," is where the noun tissue originates. Tissue really means to "weave fabric strands" as a verb. Tissues are now thought of as the disposable paper used for packaging presents or blowing our noses.
They stand for a degree of cell differentiation and order in living things. The activities of tissues include respiration, digesting, and transportation. As a result, tissues are crucial for multicellular creatures.
Thus, option 2 is correct.
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During the synthesis of esters from carboxylic acids and alcohols, the carboxylic acid is often in excess to push the equilibrium towards the products. This is because it is easier to separate the acid from the product. Describe a method to separate an ester from a carboxylic acid.
Answer: FRACTIONAL DISTILLATION separation method
Explanation:
The process by which esters are synthesized involves the reaction between a carboxylic acid and an alcohol. During this process, an excess of one of the reactants which is carboxylic acid is used. This helps to increase the rate of the chemical reaction thereby moving the equilibrium constant of the reaction towards the products.
Excess carboxylic acid mixed with the product of the reaction which is an ester can be separated using FRACTIONAL DISTILLATION separation method. This is a separation method that is used for separation of liquids with close boiling points. Example include components of petroleum, alcohol and water solutions, mixture of esters and carboxylic acids.
The process involves the introduction of a fractionating column between a flask and a condenser. The flask, which contains the impure mixture to be separated, is heated. The vapour of the liquids move into the fractionating column and they are cooled by the glass surface. The liquid with the higher boiling point (less volatile) condenses and falls back into the flask. While the one with the lower boiling point ( more volatile) distils over into the condenser and is collected as the first distillate. The esters has lower boiling point than carboxylic acids, therefore they are collected as the first distillate.