Answer:
39.2 g
Explanation:
2Ni₂O₃(s) ⟶ 4Ni(s) + 3O₂(g)First we convert 55.3 grams of Ni₂O₃ into moles of Ni₂O₃, using its molar mass:
55.3 g ÷ 165.39 g/mol = 0.334 mol Ni₂O₃Then we convert 0.334 moles of Ni₂O₃ into moles of Ni, using the stoichiometric coefficients of the balanced reaction:
0.334 mol Ni₂O₃ * [tex]\frac{4molNi}{2molNi_2O_3}[/tex] = 0.668 mol NiFinally we calculate how much do 0.668 Ni moles weigh, using the molar mass of Ni :
0.668 mol Ni * 58.69 g/mol = 39.2 gYou studied the body of someone who died in their sleep and found that your assistant accidentally left the body facedown while you were away. Knowing that the person, in life, slept face-up, you can see that the blood is pooled at their backside. What has your assistant accidentally revealed about the victim?
A. The victim probably died only a few hours before the assistant’s accident
B. The victim was probably poisoned to death
C. The victim died at least 8 hours before the body was flipped
D. The victim was probably moved after they had died by someone else—or they didn’t die in their sleep!
Answer:
D
Explanation:
Carbon-14 has a half-life of 5730 years. How much of a 144 g sample of carbon-14 will remain after 100,000 years?
Answer:
0.001 g
Explanation:
From the question given above, the following data were obtained:
Half-life (t½) = 5730 years
Original amount (N₀) = 144 g
Time (t) = 100,000 years
Amount remaining (N) =?
Next, we shall determine the number of half-lives that has elapsed. This can be obtained as follow:
Half-life (t½) = 5730 years
Time (t) = 100,000 years
Number of half-lives (n) =?
n = t / t½
n = 100,000 / 5730
n ≈ 17
Finally, we shall determine the amount remaining. This can be obtained as follow:
Original amount (N₀) = 144 g
Number of half-lives (n) = 17
Amount remaining (N) =?
N = 1/2ⁿ × N₀
N = 1/2¹⁷ × 144
N = 1/131072 × 144
N = 0.000007 × 144
N ≈ 0.001 g
Thus, the amount remaining after 100000 years is 0.001 g
Really stuck on this question !! Pls help
Answer:
can not be determined
Explanation:
because when I tried to calculate it it didn't give me the answer options that was in the pic so it's definitely C
Can someone plss help me answer those 4 questions by tonight.Thank you !
Answer:
no problem hey I will help you
How does artificial selection change a population over time?
In the coal-gasification process, carbon monoxide is converted to carbon dioxide via the following reaction: CO (g) H2O (g) CO2 (g) H2 (g) In an experiment, 0.35 mol of CO and 0.40 mol of H2O were placed in a 1.00-L reaction vessel. At equilibrium, there were 0.19 mol of CO remaining. Keq at the temperature of the experiment is __________. A) 5.47 B) 1.0 C) 1.78 D) 0.75 E) 0.56
Answer: [tex]K_{eq}[/tex] at the temperature of the experiment is 0.56.
Explanation:
Moles of [tex]CO[/tex] = 0.35 mole
Moles of [tex]H_2O[/tex] = 0.40 mole
Volume of solution = 1.00 L
Initial concentration of [tex]CO[/tex] = [tex]\frac{0.35mol}{1.00L}=0.35M[/tex]
Initial concentration of [tex]H_2O[/tex] = [tex]\frac{0.40mol}{1.00L}=0.40M[/tex]
Equilibrium concentration of [tex]CO[/tex] = [tex]\frac{0.19mol}{1.00L}=0.19M[/tex]
The given balanced equilibrium reaction is,
[tex]CO(g)+H_2O(g)\rightleftharpoons CO_2(g)+H_2(g)[/tex]
Initial conc. 0.35 M 0.40 M 0 M 0M
At eqm. conc. (0.35-x) M (0.40-x) M (x) M (x) M
Given: (0.35-x) = 0.19
x= 0.16 M
The expression for equilibrium constant for this reaction will be,
[tex]K_{eq}=\frac{[CO_2]\times [H_2]}{[CO]\times [H_2O]}[/tex]
Now put all the given values in this expression, we get :
[tex]K_{eq}=\frac{0.16\times 0.16}{(0.35-0.16)\times (0.40-0.16)}[/tex]
[tex]K_{eq}=\frac{0.16\times 0.16}{(0.19)\times (0.24)}=0.56[/tex]
Thus [tex]K_{eq}[/tex] at the temperature of the experiment is 0.56.
Base your answer on the equation and diagram below represent an electrochemical cell at 298 K and 1 atmosphere.
When the switch is closed, electrons flow from
A) Ag+(aq) to Mg2+(aq)
B) Mg(s) to Ag(s)
C) Ag(s) to Mg(s)
D) Mg2+(aq) to Ag+(aq)
When the switch is closed, electrons flow from the solid magnesium electrode, Mg(s) to solid silver electrode, Ag(s).
Electronegativity of metals
Electronegativity of metals refers to the ability of the atoms of metallic elements to attract electrons from the other metallic elements.
Electronegativity increases down the activity series.
Silver (Ag) will have more tendency to attract electron more than magnesium (Mg).
Thus, when the switch is closed, electrons flow from the solid magnesium electrode, Mg(s) to solid silver electrode, Ag(s).
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What is science..
No Spam
Answer: science is a systematic enterprise that builds and organizes knowledge in the form of testable explanations and predictions about the universe
Explanation:
Answer:
Science is a very Idiot subject and doing dimag ka dahi xD
The sea, on average, has a molarity of 0.599 M NaCl. How many grams of NaCl is this for every 1 liter?
Pls answer
Answer:
it contains 0.599 g i hope it helps
Can you tell me any chemical reaction that occur due to kinetic energy
Answer:
The molecules in gasoline (octane, the chemical formula shown) contain chemical energy. This energy is transformed into kinetic energy that allows a car to race on a racetrack.
Which of the following compounds would have the lowest
solubility?
ОНczА
O Nm3R
O Bv3(AX)2
O Hn(EX2)2
O MRD2
Please help will give brainliest
Perform the following
mathematical operation, and
report the answer to the correct
number of significant figures.
328 x 0.125 = [?]
Answer: 41.0
Explanation: When you multiply the two numbers you get 41 but you need to have the same amount of significant numbers as the number in the problem with the least significant numbers. I hope this helps
does anyone know if this is positive,negative or neutral?
Answer:
HERE
Explanation:
Question:
Does anyone know if this is positive,negative or neutral?
Answer:
Netarual
Explanation:
I but the Images down below
Using Reaction A, how many grams of CO2 can be created from 5.67 moles of water?
127.6 g CO2
199.6 g CO2
81.65 g CO2
311.85 g CO2
Answer:
81.65 g CO2
Explanation:
How does carbonic acid work to maintain blood pH? (Select all that apply.) Check All That Apply When blood is too basic, carbonic acid can ionize to bicarbonate and H+ ions, adding H+ ions to the blood. When blood is too basic, carbonic acid can ionize to bicarbonate and H+ ions, adding H+ ions to the blood. When blood becomes too acidic, bicarbonate combines with extra H+ ions to form carbonic acid, removing H+ ions from the blood. When blood becomes too acidic, bicarbonate combines with extra H+ ions to form carbonic acid, removing H+ ions from the blood. Carbonic acid is added to the blood until the pH reaches 7.4. Carbonic acid is added to the blood until the pH reaches 7.4. Carbonic acid always lowers the blood pH to 7.4. Carbonic acid always lowers the blood pH to 7.4. Carbonic acid can raise or lower the pH of blood. Carbonic acid can raise or lower the pH of blood.
Answer:
When blood is too basic, carbonic acid can ionize to bicarbonate and H+ ions, adding H+ ions to the blood.
When blood becomes too acidic, bicarbonate combines with extra H+ ions to form carbonic acid, removing H+ ions from the blood.
Carbonic acid can raise or lower the pH of blood.
Explanation:
A buffer is a solution that resists changes to its pH when small quantities of acids or bases are added to it. The human blood serves as a buffer as it contains a buffer of carbonic acid (H2CO3) and bicarbonate anion (HCO3-) which serves to maintain blood pH between 7.35 and 7.45. Other buffering systems in blood exist such as the Hydrogen ion and oxygen gas which affects oxygen binding to haemoglobin, however the carbonic-acid-bicarbonate buffer is the most important buffer for maintaining acid-base balance in the blood.
A buffer solution is made up of an acid and its conjugate base or a base and its conjugate acid. For carbonic acid-bicarbonate buffer, carbonic acid serves as the acid while bicarbonate serves as the base. When a little quantity of a base as hydroxide ions is added to a buffer, the acid reacts with it and remove it from the solution. On the other hand, when a little quantity of an acid as hydrogen ions are added to a buffer, the conjugate base reacts with it and remove it from the solution, thus keeping the pH of the solution fairly constant.
In the carbonic acid-bicarbonate buffer:
When blood is too basic, carbonic acid can ionize to bicarbonate and H+ ions, adding H+ ions to the blood.
When blood becomes too acidic, bicarbonate combines with extra H+ ions to form carbonic acid, removing H+ ions from the blood.
Thus, carbonic acid can raise or lower the pH of blood.
Carbonic acid work to maintain blood pH as follows:
When blood is too basic, carbonic acid can ionize to bicarbonate and H+ ions, adding H+ ions to the blood.When blood becomes too acidic, bicarbonate combines with extra H+ ions to form carbonic acid, removing H+ ions from the blood.Carbonic acid can raise or lower the pH of blood.WHAT IS BUFFER SOLUTION:A buffer is a solution that resists changes to its pH when small quantities of acids or bases are added to it. A buffer is made up of an acid and its conjugate base or a base and its conjugate acid. Carbonic acid is an example of buffer that contains an acid with it's conjugate base.This means that, carbonic acid works to maintain blood pH as follows:
When blood is too basic, carbonic acid can ionize to bicarbonate and H+ ions, adding H+ ions to the blood.When blood becomes too acidic, bicarbonate combines with extra H+ ions to form carbonic acid, removing H+ ions from the blood.Carbonic acid can raise or lower the pH of blood.Learn more about buffers at: https://brainly.com/question/24188850
what will the sun become when it dies
Answer:
It will become a red giant
Explanation:
When the sun runs out of its hydrogen fuel and the hydrogen atoms are combined together to make helium atoms, it expands into a red giant, which is made up of helium atoms and gases.
Which of the following is NOT an indication that a chemical reaction has taken place?
Answer:
WHERE ARE THE CHOICES?
PLEASE MAKE SURE THAT YOUR QUESTION IS RIGHT BEFORE POSTING IT シ︎
Change of state of matter is not an indication that a chemical change has taken place.
What is matter?Matter is a substance which is made up of various types of particles which occupy space and have inertia . All living things and objects are made up of various types of particles that occupy space and have inertia .
Depending on temperature and other factors matter is able to exist in different phases. Most common of which are solid, liquid and gas. Matter can exist in more than one state depending on the temperature and pressure .
State of matter can be changed by heating or cooling and even by changing the applied pressure.When a state changes matter does not break rather its state changes though its chemical composition remains same.
Physical characteristics of matter are shape, color, size and temperature. Every matter is made up of elements which cannot be broken down further by ordinary chemical reactions.
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please help ME WITH CHEM I DONT HAVE ENOUGH TIME! calculate the number of hydrogen molecules that it would have contained at stp if it had a volume of 200,00m cubed.
We know that, at STP, one mole of a gas occupies 22.4 L of volume
we'll use the same principle to solve this problem
Converting given volume to Liters:
We know that 1 m³ = 1000 L
So, 20000 m³ = (20000)*(1000) L = 2 * 10⁷ L
Converting Liters to moles:
As mentioned above, at STP, one mole occupies 22.4 Liters
Number of moles in 2 * 10⁷ L = 2 * 10⁷ / 22.4
Number of moles = 8.9 * 10⁵ moles
Converting moles to number of particles:
We know that 1 mole contains 6.022 * 10²³ molecules
So, 8.9 * 10⁵ moles contain [(8.9 * 10⁵) * (6.022 * 10²³)] molecules
Number of molecules = 53.6 * 10²⁸ molecules
In proper scientific notation:
Number of molecules = 5.36 * 10²⁹ molecules
How many watts do I consume if I eat a 600 Calorie sandwich in 600 seconds
Answer:
1 watt is conduned by you ok
PLEASEEE PLEASEE HELP THIS IS MY FINAL EXAM AND I HAVE 30 MINS REMAINING
You have 5 moles of O2. How many moles of CO2, are produced?
Answer:
1
Explanation:
1234567891011121314151617181920
Calculate the volume of 0.250 M H2SO4 that contains 0.00255 mol H2SO4.
Answer:
0.0102 L or 10.2 mL
Explanation:
From the question given above, the following data were obtained:
Molarity = 0.250 M
Mole = 0.00255 mole
Volume =?
Molarity is simply defined as the mole of solute per unit litre of the solution. Mathematically, it is expressed as:
Molarity = mole / Volume
With the above formula, we can obtain the volume as follow:
Molarity = 0.250 M
Mole = 0.00255 mole
Volume =?
Molarity = mole / Volume
0.250 = 0.00255 / volume
Cross multiply
0.250 × volume = 0.00255
Divide both side by 0.250
Volume = 0.00255 / 0.250
Volume = 0.0102 L
Covert 0.0102 L to mL.
1 L = 1000 mL
Therefore,
0.0102 L = 0.0102 L × 1000 / 1 L
0.0102 L = 10.2 mL
Thus, the volume is 0.0102 L or 10.2 mL
Help plz:)))I’ll mark u Brainliest
Answer:
2.475 mol of O2 formed.
Explanation:
Given 1.65 moles of KClO3 as the target amount in the reactant, used the coefficient of the balanced chemical reaction involved to determine the number of moles of O2 molecules formed.
x mole of O2 = 1.65 mol KClO3 x [(3 mol O2)/ (2 mol KClO3)] = 2.475 mol of O2
x mole of O2 formed = 2.475 mol of O2
A solution with a pH of 5.30 has a H+ concentration of
Answer:
5.01 x 10^-6 M
Explanation:
PH= -log [H+]
[H+] = 10^-PH
!!!!!!
According to the following reaction, how many moles of dinitrogen
monoxide will be formed upon the complete reaction of 0.192 moles
ammonium nitrate?
ammonium nitrate (aq)
>dinitrogen monoxide (g) +
water (1)
…moles dinitrogen monoxide
Answer:
0.192 mol N₂O
Explanation:
Step 1: Write the balanced equation
NH₄NO₃(aq) ⇒ N₂O(g) + 2 H₂O(l)
Step 2: Establish the appropriate molar ratio
According to the balanced equation, the molar ratio of NH₄NO₃ to N₂O is 1:1.
Step 3: Calculate the number of moles of N₂O formed upon complete reaction of 0.192 moles of NH₄NO₃
We will use the previously established molar ratio.
0.192 mol NH₄NO₃ × 1 mol N₂O/1 mol NH₄NO₃ = 0.192 mol N₂O
TRUE or FALSE: We have 2 copies of each gene because we have 2 parents.
A catalyst is:
a chemical found in leaves
a chemical which promotes a chemical reaction
a chemical which reacts with sunlight
a cell with chlorophyll
Answer:
a chemical which promotes a chemical reaction
and sppeds up that reaction.
What happens to the rate constant as activation energy increases?
A. The rate constant decreases.
B. The rate constant levels off.
C. The rate constant does not change.
D. The rate constant increases.
Answer:
A. The rate constant decreases
Explanation:
i took the quiz on a pex and it was correct
A solution of dispersant is made by taking 15.0 mL of a 50.0 mg/mL solution of Randyne and mixing it with 50.0 mL of water. Calculate the final concentration of the Randyne in this solution, in units of grams per milliliter.
Answer:
The final concentration of the Randyne in grams per milliliter = 0.011 g/mL
Explanation:
As we know
C1V1 = C2V2
C1 and C2 = concentration of solution 1 and 2 respectively
V1 and V2 = Volume of solution 1 and 2 respectively
Substituting the given values, we get -
[tex]50 * 15 = X * (15+50)\\X = 11.54[/tex] mg/mL
The final concentration of the Randyne in grams per milliliter = 0.011 g/mL
The final concentration of the Randyne in this solution is 0.01 g /mL.
How to calculate dilutions?It is very important to know the dilution methods in a chemistry lab. The dilution from the stock solution can be prepared by using the formula,
[tex]C_1V_1 = C_2V_2[/tex]
Where,
[tex]C_1[/tex]- concentration of the stock solution
[tex]V_1[/tex] - the volume of the stock solution
[tex]C_2[/tex] - concentration of the diluted solution
[tex]V_2[/tex] - the volume of diluted solution
Put the values in the formula,
[tex]50 \times 15 = C_2 \times 75 \\\\C_2 = \dfrac {750}{75 }\\\\C_2 = 10{\rm \ mg/mL \ \ \ or} \\\\ C_2 = 0.01 \rm \ g/mL[/tex]
Therefore, the final concentration of the Randyne in this solution is 0.01 g /mL.
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If the acid dissociation constant, Ka, for an acid HA is 8 x 104 at 25°C, what percent of the acid is dissociated
in a 0.50 M solution of HA at 25°C?
A
08%
Answer:
Percent dissociated = 3.92%
Explanation:
The equilibrium of the weak acid, HA, is:
HA ⇄ H⁺ + A⁻
Where Ka = 8x10⁻⁴ is: [H⁺] [A⁻] / [HA]
As both H⁺ and A⁻ comes from the same equilibrium we can write the concentrations of the species as follows:
[H⁺] = X
[A⁻] = X
[HA] = 0.50M - X
Where X is reaction coordinate
Replacing:
8x10⁻⁴ = X² / 0.50-X
4x10⁻⁴ - 8x10⁻⁴X - X² = 0
Solving for X:
X = -0.02M. False solution. There is no negative concentrations
X = 0.0196M. Right solution.
Replacing:
[A⁻] = 0.0196M
Percent of the acid that is dissociated is:
[A⁻] / [HA]₀ * 100
[HA]₀ is its initial concentration = 0.50M
0.0196M / 0.50M * 100
Percent dissociated = 3.92%What is a cell? ♀️
Answer:
Cell is defined as the smallest unit or basic unit of life.
the smallest part of a living thing that can carry out the activities needed for life. Basically the unit of all forms of life.
Explanation:
hope this helps in anyway :)