Answer:
1)Molarity of 0.5 Moles of Sodium Chloride in 0.05 Liters of solution is 10 M.
2)Molarity of 734 grams of lithium sulfate are dissolved to make 2500 mL of solution is 2.68 M.
3)Molarity of a solution is made by adding 83 grams of sodium hydroxide to 750 mL of water is 2.77 M.
4)Molarity of a solution that contains .500 mol HC₂H₃O₂ in 0.125 kg H₂O is 4 M.
5)Molarity of a solution that contains 63.0 g HNO₃ in 0.500 kg H₂O is 2 M.
6)The mass of water required to form 3.0 M solution by dissolving 0.5kg of C₂H₅OH is 3.62 kg.
Explanation:
Molarity is given as
[tex]M=\dfrac{n}{V}[/tex]
Here
n is number of moles V is the volume of the solution in litersUsing this all the values are calculated as follows:
1)Molarity of 0.5 Moles of Sodium Chloride in 0.05 Liters of solution is
[tex]M=\dfrac{n}{V}\\M=\dfrac{0.5}{0.05}\\M=10[/tex]
So the molarity is 10 M.
2)Molarity of 734 grams of lithium sulfate are dissolved to make 2500 mL of solution is
[tex]M=\dfrac{n}{V}[/tex]
Here n is calculated as follows:
[tex]n=\dfrac{mass\ of\ solute}{Molar\ mass\ of\ Solute}[/tex]
Here the molar mass of lithium sulphate is as follows:
[tex]MM of Li_2SO_4=2\times Li+S+4\times O\\MM of Li_2SO_4=2\times 7+32+4\times 16\\MM of Li_2SO_4=110[/tex]
So n is
[tex]n=\dfrac{mass\ of\ solute}{Molar\ mass\ of\ Solute}\\n=\dfrac{734}{110}\\n=6.67[/tex]
V is given as
[tex]V_{L}=\dfrac{V_{mL}}{1000}\\V_{L}=\dfrac{2500}{1000}\\V_{L}=2.5\ L[/tex]
So the molarity is given as
[tex]M=\dfrac{n}{V}\\M=\dfrac{6.67}{2.5}\\M=2.68\ M[/tex]
So the molarity is 2.68 M.
3)Molarity of a solution is made by adding 83 grams of sodium hydroxide to 750 mL of water is
[tex]M=\dfrac{n}{V}[/tex]
Here n is calculated as follows:
[tex]n=\dfrac{mass\ of\ solute}{Molar\ mass\ of\ Solute}[/tex]
Here the molar mass of Sodium hydroxide is as follows:
[tex]MM of NaOH=Na+O+H\\MM of NaOH=23+16+1\\MM of NaOH=40[/tex]
So n is
[tex]n=\dfrac{mass\ of\ solute}{Molar\ mass\ of\ Solute}\\n=\dfrac{83}{40}\\n=2.075[/tex]
V is given as
[tex]V_{L}=\dfrac{V_{mL}}{1000}\\V_{L}=\dfrac{750}{1000}\\V_{L}=0.75\ L[/tex]
So the molarity is given as
[tex]M=\dfrac{n}{V}\\M=\dfrac{2.075}{0.75}\\M=2.77\ M[/tex]
So the molarity is 2.77 M.
4)Molarity of a solution that contains .500 mol HC₂H₃O₂ in 0.125 kg H₂O is
[tex]M=\dfrac{n}{V}[/tex]
V is given as
[tex]V_{L}=\dfrac{mass}{density}\\V_{L}=\dfrac{0.125}{1 kg/L}\\V_{L}=0.125\ L[/tex]
So the molarity is given as
[tex]M=\dfrac{n}{V}\\M=\dfrac{0.5}{0.125}\\M=4.0\ M[/tex]
So the molarity is 4.00 M.
5)Molarity of a solution that contains 63.0 g HNO₃ in 0.500 kg H₂O is
[tex]M=\dfrac{n}{V}[/tex]
Here n is calculated as follows:
[tex]n=\dfrac{mass\ of\ solute}{Molar\ mass\ of\ Solute}[/tex]
Here the molar mass of HNO₃ is as follows:
[tex]MM of HNO_3=H+N+3\times O\\MM of HNO_3=1+14+3\times 16\\MM of HNO_3=63[/tex]
So n is
[tex]n=\dfrac{mass\ of\ solute}{Molar\ mass\ of\ Solute}\\n=\dfrac{63}{63}\\n=1.00[/tex]
V is given as
[tex]V_{L}=\dfrac{mass}{density}\\V_{L}=\dfrac{0.5}{1 kg/L}\\V_{L}=0.5\ L[/tex]
So the molarity is given as
[tex]M=\dfrac{n}{V}\\M=\dfrac{1}{0.5}\\M=2.00\ M[/tex]
So the molarity is 2.00 M.
6)Mass of water must be used to dissolve 0.500 kg C₂H₅OH to prepare a 3.00 m solution is calculated as follows
[tex]M=\dfrac{n}{V}[/tex]
Here n is calculated as follows:
[tex]n=\dfrac{mass\ of\ solute}{Molar\ mass\ of\ Solute}[/tex]
Here the molar mass of C₂H₅OH is as follows:
[tex]MM of C_2H_5OH=2\times C+6\times H+O\\MM of C_2H_5OH=2\times 12+6\times 1+16\\MM of C_2H_5OH=46[/tex]
So n is
[tex]n=\dfrac{mass\ of\ solute}{Molar\ mass\ of\ Solute}\\n=\dfrac{500}{46}\\n=10.87[/tex]
V required is given as
[tex]M=\dfrac{n}{V}\\V=\dfrac{n}{M}\\V=\dfrac{10.87}{3}\\V=3.62\ L[/tex]
So the mass of water is given as
[tex]mass=density\times Volume\\mass=1 kg/L \times 3.62 L\\mass=3.62\ kg[/tex]
So the mass of water required to form 3.0 M solution by dissolving 0.5kg of C₂H₅OH is 3.62 kg.
if the pH of a solution is 8.43, what is the [H+] concentration?
Answer: 3.7x10^-9
Explanation:
When sodium chloride is dissolved in water, the freezing point of water _________. A. increases B. first increases, then decreases C. does not change D. decreases
The presence of a non-volatile salt will decrease the freezing point of water and this process is called depression in freezing point. Thus option D is correct.
What is freezing point?Freezing point of a substance is the temperature at which it converts from its liquid state to solid state where, both the states are in equilibrium. Freezing point of water is zero degree celsius.
The freezing point of a solvent depends on some parameters such as the bond type, molecular weight, temperature, pressure etc.
When a non-volatile solute is added to the solvent its freezing point decreases from its initial value. Because presence of non-volatile salts will affect the intermolecular attraction and thereby the energy that must be applied to freeze the compound.
Therefore, the freezing point of water decreases, when sodium chloride is added into it. Thus option D is correct.
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Select the statement that is FLASE about this experiment. Group of answer choices Changing metal solution will affect the redox potential. To ensure consistent data, collect the redox potential values at least three times. Changing temperature will affect the redox potential. To ensure stable reading, insert the conductivity meter in the solution for at least 60 seconds. Changing concentration will affect the redox potential.
Well arranged question is;
Select the statement that is FALSE about this experiment. Group of answer choices;
A) Changing metal solution will affect the redox potential.
B) To ensure consistent data, collect the redox potential values at least three times.
C) Changing temperature will affect the redox potential.
D) To ensure stable reading, insert the conductivity meter in the solution for at least 60 seconds.
E) Changing concentration will affect the redox potential.
Answer:
D) To ensure stable reading, insert the conductivity meter in the solution for at least 60 seconds.
Explanation:
Usually, redox potential is the measure of the ability of chemical elements to gain/lose electrons from/to an electrode respectively and after which they undergo reduction or oxidation respectively.
From online sources on experiments to determine redox potential, and taking into account the nernst equation which is; E_cell = E_0 – (RT/nF)•ln Q
Where;
E_cell is cell potential
E_0 is potential of the cell under standard conditions
R is universal gas constant
T is temperature
n is the number of electrons that are transferred in the redox reaction
F is Faraday's constant
Q is reaction quotient
Now, with all that in mind and looking at the options, the one that is false is option D.
Show your work. 37.2 moles CO2 to oxygen atoms.
Which chemical reaction is the slowest?
A. Cake rises as it cooks in the oven.
B. Drain cleaner fizzes up as it encounters blockages in a pipe.
C. Baking soda and vinegar react.
D. Milk turns sour.
WILL GIVE BRAINLIEST!!
Answer:
Milk turns sour
The chemical reaction or chemical change which is slowest is milk turning sour as it involves enzymatic actions which are slow reactions.
What is a chemical change?Chemical changes are defined as changes which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical change.
There are several characteristics of chemical changes like change in color, change in state , change in odor and change in composition . During chemical change there is also formation of precipitate an insoluble mass of substance or even evolution of gases.
There are three types of chemical changes:
1) inorganic changes
2)organic changes
3) biochemical changes
During chemical changes atoms are rearranged and changes are accompanied by an energy change as new substances are formed.
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Question 5 of 25
Which type of reaction is shown by this general equation?
Reactants + energy - products
A. Synthesis
B. Combustion
C. Endothermic
D. Exothermic
Answer:
C Endothermic
Explanation:
a. p. e. x
In order to have an eclipse,the moon,sun and earth have to be?
A. Below each other
B. Above each other
C. In alignment
Explanation:
When the Moon passes between Sun and Earth, the lunar shadow is seen as a solar eclipse on Earth. When Earth passes directly between Sun and Moon, its shadow creates a lunar eclipse. ... But lunar eclipses do not occur every month because the Moon's orbit is tilted five degrees from Earth's orbit around the Sun.
Can anyone just give me the answers?
Answer:
i answered you
Explanation:
In the area with a large population of valuable ocean organisms is called a(n)
Answer:
fishery
An area with a large population of valuable ocean organisms is called a fishery. If it was correct mark me as brainiest
Acts as the digestive system inside a cell. It helps to break down old or unneeded parts of the cell, and substances that have been brought into the cell from the outside. WHO I AM?
Answer:
I think it is enzymes
Explanation:
1.23 x 104 L = ? m3
Complete the conversions above. Please show your work and include units in your final answer.
Please I need it ASAP
Answer:
1.23 x 104 L = 0.12792 m3
Explanation:
!!!!!!!!!!
The reduced coenzymes generated by the citric acid cycle donate electrons in a series of reactions called the electron transport chain. The energy from the electron transport chain is used for oxidative phosphorylation. Which compounds donate electrons to the electron transport chain
Answer:
NADH and FADH2
Explanation:
The electron transport chain yields ATP, the energy driver for the body's metabolism by using atmospheric oxygen at the mitochondria.
The role of NADH and FADH2 (nicotinamide adenine dinucleotide (NAD) + hydrogen (H) and Flavin adenine dinucleotide) becomes so important as they are responsible for giving out electrons to the electron transport chain and that is a very crucial process for cellular respiration as adenosine triphosphate is produced. The hydrogen molecule in NADH and FADH2 are lost to the waiting oxygen molecule which now forms water.
Select the keyword or phrase that will best complete each sentence. A Claisen reaction is a nucleophilic ____________ in which an enolate is the nucleophile.
Answer:
Substitution.
Explanation:
Claisen reaction was first published in 1887 by a prominent German chemist known as Rainer Ludwig Claisen.
A Claisen reaction is a nucleophilic substitution in which an enolate is the nucleophile. It's typically a reaction of two molecules of an ester to form a β-keto ester, in the presence of an alkoxide base. Thus, a Claisen reaction is simply a characteristic condensation reaction of esters through a nucleophilic carbonyl substitution with an enolate such as a ketone enolate or an ester enolate.
Furthermore, a Claisen reaction results in the formation of a carbon-carbon bond in the presence of a strong base to yield a β-keto ester.
How many moles of ammonia would be required to react exactly with 0.554 moles of copper(II) oxide in the following in chemical reaction? 2 NH3(g) + 3 CuO(s)= 3Cu(s) + N2(g) + 3 H2O(g)
Which acid was used in the titration curve below?
HCl
H2 S O4
HNO3
H3PO4
HNO3
Explanation:
hydrochloric acid (HCl), sulfuric acid (H 2start subscript, 2, end subscriptSO 4start subscript, 4, end subscript), nitric acid (HNO 3start
List and explain each of the signs of a chemical change.
What is the molarity of a solution?
the answer is The number of moles of a solute per kilogram of solvent
Molar concentration is a measure of the concentration of a chemical species, in particular of a solute in a solution, in terms of amount of substance per unit volume of solution.
Atmospheric pressure decreases as altitude increases. In other words, there is more air pushing down on you at sea level, and there is less air pressure pushing down on you when you are on a mountain.If pentane (C5H12), hexane (C6H14), and hexanol (C6H13OH) are heated evenly at different altitudes.
Required:
Rank them according to the order in which you would expect them to begin boiling.
Answer:
Pentane » Hexane » Hexanol
Explanation:
Pentane and Hexane are simple molecular structured with discrete molecules having weak vanderwaals forces of attraction. But Hexane has high molecular mass than pentane hence pentane has lower boiling point than Hexane.
Hexanol has hydrogen bonds between highly electronegative oxygen atom and the hydrogen atom which break on high heat energy application hence it has high boiling point.
Why do scientist conduct experiments on animals?
Answer:
Animals are used in scientific research to help us understand our own bodies and how they work. This is necessary to develop new medicines. Animals are also used to safety test potential medicines before they are tested in people and to check the safety of other chemicals.
Explanation:
In butter, [H3O+] =6.0x10-7 M, what is the pH? Is butter acidic, basic, or neutral?
Answer:
Label each solution as acidic, basic, or neutral based only on the stated pH.
milk of magnesia, pH = 10.5
pure water, pH = 7
wine, pH = 3.0
Solution
With a pH greater than 7, milk of magnesia is basic. (Milk of magnesia is largely Mg(OH)2.)
Pure water, with a pH of 7, is neutral.
With a pH of less than 7, wine is acidic.
If the atomic number of chlorine is 17 and the atomic mass is 35.5 amu, then the molar mass of chlorine is?
Answer:
If the percentage abundance of Cl-35 is x , then x×35+(100−x)37100=35.5
75% of Cl-35 and 25% of Cl-37.I hope this helped!
Explanation:
A gas is under a pressure of 760torr and occupies volume of 525cm3. If the pressure is doubled, what volume would gas now occupy? Assume the temperature is constant?
262. 5cm3.
using the Boyles law formula. p1v1=p2v2
P1=760torr.
v1=525cm³
p2=760×2=1520torr.
v2=?
p1v1=p2v2
760×525=1520×v2
v2=[ 760×525]÷1520
v2= 262.5cm³
when the pressure increases, the volume decreases.
What types of foundations are not good when building in an area that is likely to experience earthquakes?
soft clay
wet and sandy soil
hard clay
bedrock
Answer:
Wet and sandy soil as it does not provide a sturdy structure
State the number of neutrons in an atom of Ne-20 and the number of neutrons in an atom of Ne-22. choose two answers * 1 point Ne 20: 10 Ne 20: 11 Ne 22: 12 Ne 22: 13
Answer:
Ne 20: 10
and
Ne 22: 12
Explanation:
Ne-20:
N = A - Z = 20 - 10 = 10 neutrons
Ne-22:
N = A - Z = 22 - 10 = 12 neutrons
N: number of neutrons
A: mass number
Z: atomic number
How much heat energy is required to boil 66.7 g of ammonia, NH3? The molar heat of vaporization of ammonia is 23.4 kJ/mol.
Answer:
91.7 kJ
Explanation:
Step 1: Given data
Mass of ammonia (m): 66.7 gMolar heat of vaporization of ammonia (ΔH°vap): 23.4 kJ/molStep 2: Calculate the moles (n) corresponding to 66.7 g of ammonia
The molar mass of ammonia is 17.03 g/mol.
66.7 g × 1 mol/17.03 g = 3.92 mol
Step 3: Calculate the heat (Q) required to boil 3.92 moles of ammonia
We will use the following expression.
Q = ΔH°vap × n
Q = 23.4 kJ/mol × 3.92 mol = 91.7 kJ
what is the molarity of a solution of sodium hydroxide if it 15.0 mL requires 25.0 ml of 0.25M HCl to reach the end point
Answer:
0.42 M
Explanation:
We'll begin by writing the balanced equation for the reaction. This is illustrated below:
HCl + NaOH —> NaCl + H₂O
From the balanced equation above,
The mole ratio of acid, HCl (nₐ) = 1
The mole ratio of base, NaOH (n₆) = 1
Finally, we shall determine the molarity of the base, NaOH. This can be obtained as follow:
Volume of acid, HCl (Vₐ) = 25 mL
Molarity of acid, HCl (Mₐ) = 0.25 M
Volume of base, NaOH (V₆) = 15 mL
Molarity of base, NaOH (M₆) =?
MₐVₐ / M₆V₆ = nₐ/n₆
0.25 × 25 / M₆ × 15 = 1
6.25 / M₆ × 15 = 1
Cross multiply
6.25 = M₆ × 15
Divide both side by 15
M₆ = 6.25 / 15
M₆ = 0.42 M
Therefore, the molarity of the base, NaOH is 0.42 M
What has more kinetic energy? 120 180, 105
Answer:
If those values are in terms of mass, weight or velocity
Kinetic energy will be in the order 180 » 120 » 105
Answer:
105, if you're dealing with the weight of object
Explanation:
It's the amount of speed/movement an object can move. The lighter the weight the more amount of speed it has.
Hope this helps!
What characteristic should an isotope used for dating have?
O A. It should have a half-life much shorter than the age of the object
being dated.
B. It should have a half-life that is close to the age of the object being
dated.
O C. It should have a half-life that changes with time in the object being
dated.
O D. It should have a half-life much longer than the age of the object
being dated.
Answer:
B
Explanation:
took the test
D. It should have a half-life much longer than the age of the object being dated. When using isotopes for dating purposes, it is important to choose an isotope with a half-life that is significantly longer than the age of the object being dated.
What is the half-life time?The half-life is the time it takes for half of the radioactive isotopes in a sample to decay into stable isotopes. By measuring the ratio of the original radioactive isotope to the decay product, scientists can determine the age of the object.
The majority of the radioactive material would have decayed if the isotope had a half-life substantially less than the age of the artefact, making it challenging to precisely establish the age.
On the other hand, the dating procedure would become more challenging and unpredictable if the isotope in the object being dated (option C) has a half-life that varies over time.
As a result, an isotope with a long half-life offers a stronger basis for precise dating since it enables sufficient radioactive decay to take place, producing quantifiable and trustworthy data.
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The chemical reaction between water and magnesium is?
Answer: hydrogen gas
Explanation: When magnesium interacts with water, it will form a hydrogen gas that ignites violently due to the excessive heat and oxygen supply.
Estimate the salt-to-water mass ratio that would produce the necessary change in temperature (i.e., 22-25°C.) Use the mass of salt calculated in the previous question and the water-to-salt ratio to determine the volume of water needed.
Answer:
Sea water salinity is expressed as a ratio of salt (in grams) to liter of water. In sea water there is typically close to 35 grams of dissolved salts in each liter. It is written as 35‰. The normal range of ocean salinity ranges between 33-37 grams per liter (33‰ - 37‰).