Answer:
0.1
Explanation:
We must first put down the equation of the reaction in order to guide our solution of the question.
2HNO3(aq) + Sr(OH)2(aq) -------> Sr(NO3)2(aq) + 2H2O(l)
Now from the question, the following were given;
Concentration of acid CA= ??????
Concentration of base CB= 0.299M
Volume of acid VA= 17.8ml
Volume of base VB= 24.7ml
Number of moles of acid NA= 2
Number of moles of base NB= 1
From;
CAVA/CBVB= NA/NB
CAVANB= CBVBNA
CA= CBVBNA/VANB
SUBSTITUTING VALUES;
CA= 0.299 × 24.7 ×2 / 17.8×1
CA= 0.8298 M
But;
pH= -log[H^+]
[H^+] = 0.8298 M
pH= -log[0.8298 M]
pH= 0.1
The kinetics of a gas phase reaction of the form A → Products results in a rate constant of 1.308 M⁻¹ s⁻¹. For this reaction, the initial concentration of A is 0.155 M. What is the concentration of A after 0.385 seconds?
Answer:
[tex]C_A=0.144M[/tex]
Explanation:
Hello,
In this case, given the rate constant, we infer this is about a second order reaction, whose equation is:
[tex]\frac{dC_A}{dt}=kC_A^2[/tex]
Thus, by integration we obtain:
[tex]\frac{1}{C_A}= \frac{1}{C_A_0}+kt[/tex]
Hence, we solve for the final concentration after 0.385 s:
[tex]\frac{1}{C_A}= \frac{1}{0.155M}+\frac{1.308}{Ms} *0.385s=\frac{6.955}{M}\\ \\C_A=\frac{M}{6.955} \\\\C_A=0.144M[/tex]
Best regards.
How do geological processes affect where we find rock and mineral resources (natural resources)?
Answer:
Geological processes can change over time. Water erosion can move sand and dirt and anything. Minerals are everywhere, but they can be buried or washed away by all the geological processes that happen every day.
Explanation:
the force that one surface exerts on another when the two rub against each other is called _
Answer:
friction
Explanation:
200 L of a gas at 10 atm pressure and 400 K is cooled to 100 K and reduced to 2 atm pressure. What is the new volume?
Answer:
250L
Explanation:
Data;
V1 = 200L
P1 = 10atm
T1 = 400K
T2 = 100K
P2 = 2atm
V2 = ?
To solve this question, we'll have to use the combined gas equation which is a combination of Boyle's law, Charles law and pressure law.
From combined gas equation,
(P1 × V1) / T1 = (P2 × V2) / T2
P1 × V1 × T2 = P2 × V2 × T1
Solve for V2,
V2 = (P1 × V1 × T2) / P2 × T1
V2 = (10 × 200 × 100) / (2 × 400)
V2 = 200,000 / 800
V2 = 250L
The final volume of the gas is 250L
What is activation energy
Answer:
Activation energy is the energy that's provided to a chemical or nuclear system, whichever one, with reactants to get a result of a chemical reaction or a nuclear, or many other reactions. Well that's what I know, I tried(:
Explanation
Well that's what I know, I tried(:
Which symbol in a chemical equation separates the reactants from the products ?
Answer:
Explanation:
The arrow symbol in a chemical equation separates the reactants from products. A chemical reaction is process in which chemical changes leads to the formation of products from reactants.
Answer: b
Explanation: its b
What is the molarity of a solution formed by dissolving 100 g of Ca(No3)2 and 450 mL of solution
Answer:
1.35 M
Explanation:
grams/molar mass=ans./volume(L)
100/164=ans./.450
how many molecules are there in 125 grams of sugar, C12H22O11
Answer:
125
Explanation:
A molecule of sucrose (C12H22O11) has 12 carbon atoms, 22 hydrogen
You complete a titration and find that you need 2.5 mL of a 0.1M NaOH to neutralize 250 mL of
the river water.
How many moles of NaOH did you use to neutralize the river water?
Answer:
0.00025 mole
Explanation:
The number of moles of a substance can be mathematically derived from the following formula
1. mass of substance (in grams)/molar mass of substance (in grams/mole)
2. molarity of substance (in mol/dm3) x volume of substance (in dm3)
In this case, the molarity and volume of NaOH are provided, hence, the second formula will be applicable.
2.5 mL of NaOH was used = 0.0025 dm3
Number of mole of NaOH that was used to neutralize the river water:
= 0.1 x 0.0025 = 0.00025 mole
The number of mole of NaOH used to neutralize the river water is 0.00025 mole.
Using the stars as an example explain how nuclear fusion works
Asap help
It's very important
Answer:
b. blinking of eyes
Explanation:
Answer:
The answer is B
Explanation:
Blinking is involuntary but also can be done voluntarily.
Use the drop-down menus to complete the statement and describe how energy relates to work.
transfers
between objects.
Answer: the first one is work and the second one is energy
Explanation:
Answer:
first :work second:energy
Explanation:
my Chemistry questions
How can you burn an apple, blueberry, rose and pumpkin without leaving any ashes but retaining the smell of it?
Answer:
candles
Explanation:
if u burn these fruits, it is obvious that there will be ashes but the key hint here is
" retaining the smell"
and what are things that smell and can be fruit scented?
a..... CANDLE
hope this helped :D
Answer:
BY BURNING A CANDLE WITH ITS SCENT
Explanation:
The tendency of an object to resist a change.
A. Inertia
B. Friction
C. Law of conservation of motivation
D. Force
Answer:
inertia is the tendency of an object to resist a change
what is the drag force acting on a car with a resultant force of 600N when the engine is pushing it with a force of 11,000N
Answer:
10 400 N
Explanation:
A drag force is an oppositional or limiting force which must be overcome before an object must move wit a force. The lesser the drag force, the higher the probability that an object would move easily.
From the question give, the resultant force of the was is 600 N and force from the engine - 11 000 N.
Drag force = 11 000 - 600
= 10 400 N
The drag force on the car is 10 400 N.
This shows that the car would not move since the drag force (10 400 N) is far greater than the resultant force(600 N).
If 1.27 moles of bromine gas (Br2) react with excess phosphorus (P), how many moles of phosphorus tribromide (PBr3) will be produced?
Answer:
0.85 mole of PBr3.
Explanation:
We'll begin by writing the balanced equation for the reaction. This is given below:
3Br2 + 2P —> 2PBr3
From the balanced equation above,
3 moles of Br2 reacted to produce 2 moles of PBr3.
Therefore, 1.27 moles of Br2 will react to produce = (1.27 x 2)/ 3 = 0.85 mole of PBr3.
Therefore, 0.85 mole of PBr3 is produced by the reaction.
When red litmus paper is added to limewater, then what will
be the change in litmus paper? Give reason. Write the chemical
formula of limewater also.
Red Litmus paper turns blue
Answer:
[tex] Ca(OH) _2 [/tex]
Explanation:
In lime water [tex] \red{\bold {RED}} [/tex] litmus paper turns [tex] \blue {\bold {BLUE}} [/tex] because lime water is alkaline.
[tex]formula \: for \: lime \: water : Ca(OH) _2 \\ [/tex]
Is the molecule saturated or unsaturated
Answer:
Guessing its unsaturated.
Explanation:
A fully saturated compound contains no double or triple bonds. Alternatively, if a molecule contains double or triple bonds, it is considered to be unsaturated.
Organic chemistry!!! Plz help
Answer:
3) 2,2-dichloroheptane
Explanation:
2,2-dichloroheptane
In a solid to liquid mixture and increase in temperature means?
Answer:
Increase in temperature will not affect a solid - liquid mixture. Example can be taken of salt and water
Test
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01:48:02
1
About how long does it take Earth to complete one revolution around the Sun?
1 year
14 days
24 hours
27.3 days
Next
Submit
Save and Exit
Mark this and retum
rotodo
o
Answer:
A) one year
Explanation:
One complete revolution takes 365.25 days, or one year.
Answer:
1 year
Explanation:
Calculate the molarity of a solution containing 0.2 mol of sodium hydroxide dissolved in 0.5 L of water. Be sure to report your answer in proper significant figures and use the appropriate symbol.
Answer:
The molarity is 0.4 [tex]\frac{moles}{liter}[/tex]
Explanation:
The Molarity (M) or Molar Concentration is a concentration unit that indicates the number of moles of the solute per liter of solution. In other words, molarity is defined as the number of moles of solute that are dissolved in a given volume.
The Molarity of a solution is determined by the expression:
[tex]Molarity (M)=\frac{number of moles of solute}{volume}[/tex]
Molarity is expressed in units ([tex]\frac{moles}{liter}[/tex]).
In this case:
number of moles of solute (sodium hydroxide)= 0.2 molesvolume= 0.5 LReplacing:
[tex]Molarity (M)=\frac{0.2 moles}{0.5 L}[/tex]
Molarity= 0.4 [tex]\frac{moles}{liter}[/tex]
The molarity is 0.4 [tex]\frac{moles}{liter}[/tex]
This Venn diagram is used to compare the products and reactants of a reaction of baking soda and vinegar. What could be put into the intersection? Precipitates Chemical compounds Solid compounds Gases
I think and I'm sure it is gases
Answer:
gasses
Explanation:
i took the quiz
Which example is not a structural adaptation of animals?
NEED HELP ASAP
A. a tortoise shell to protect from predators
B. wings on a bird to get food and escape predators
C. a seal's thick fat to keep it from freezing
D. gosling following their mother to stay protected
In calculating the mean donation amount, which steps would you need to take? Check all that apply.
A)Multiply each donation amount by the number of people. B)Add the total amount of money. C)Add the total number of people D)2,550 ÷ 25 = $102 E)25 ÷ 2,550 = $0.01
Answer:
A,B,C,D
Explanation:
I just took the test
Answer:
Its
A: Multiply each donation amount by the number of people.
B: Add the total amount of money.
C: Add the total number of people.
D: 2,550 ÷ 25 = $102
Explanation:
Edg2020
This is for chemistry
I need help for this question
Answer:
what is the quetion.......
Explanation:
If you want to make more shells (CaCO3) then which direction should the reaction proceed?
Answer:
The reaction will proceed in the reverse direction
Explanation:
Now consider the equation;
CaCO3(s) ⇄CO2(g) + CaO(s)
This is a reversible reaction. The reaction could proceed in either the forward or the reverse reaction depending on the conditions of the reaction. Under certain conditions, the forward reaction is favoured, under certain conditions, the reverse reaction is favoured.
The direction in which the reaction proceeds depends on the desired products as the equilibrium position could be manipulated at will by altering the reaction conditions. If the desire is to produce more CaCO3, then the equilibrium position is manipulated so that it shifts towards the left hand side. This implies that the reverse reaction is favoured.
F2(g)+2Br(aq)=Br(t)+F(aq)
which species is redused?
a)F
b)Br
c)F2
d)Br2
The Answer For Your Question is:
A) F
A 1.8−mL volume of seawater contains about 4.0 × 10^−10 g of gold. The total volume of ocean water is about 1.5 × 10^21 L. Calculate the total worth of all the gold in the world's oceans if the price of gold is $19.96 per gram answer is in scientific notation
Answer: $6.653×10^15
Explanation:
Volume of sea water sample = 1.8mL
Mass of gold in sample = 4.0 × 10^-10 g
Total volume of ocean water = 1.5 × 10^21 L
Converting volume of seawater sample into liters :
1.8mL = (1.8/1000)L = 0.0018L = 1.8×10^-3
If volume of gold in ;
1.8×10^-3L = 4 × 10^-10 g
1.5×10^21 L = X
(1.8×10^-3L)X = [(1.5×10^21) × (4×10^-10) ]
X = [1.5×4(10^21-10)] / 1.8×10^-3
X = 6.0(10^11) / 1.8×10^-3
X = 3.333×(10^11+3)
X = 3.333 × 10^14
Cost of world's gold equals
(3.333 × 10^14) × $19.96
$66.53 × 10^14
What is the ion in acids that determines if they are safe to eat?
I need an answer but I can´t give anything because i don´t know how
Answer:
Hydrogen ion.
Explanation:
Hydrogen ion is present in the acids which indicates if they are safe for eating or not. The weak acid is present in citrus so it is safe to eat. Weak acid means the concentration of hydrogen ion is lower. If this concentration exceeds so the food is not safe to eat or drink. The pH of acid more than 5 is good to eat but below 5 can adversely affect our body if we consume it.