Answer:
Titrant and analyte is a pair of acid and base. ... Equivalence point: point in titration at which the amount of titrant added is just enough to completely neutralize the analyte solution. At the equivalence point in an acid-base titration, moles of base = moles of acid and the solution only contains salt and water.
Explanation:
what is the molarity of 1 mole of Ba+ in 2 L of water
Answer: 0.5 M
Explanation:
molarity is defined as [tex]\frac{mol}{L}[/tex]
in the question, we are already given the amount of moles of Ba+ and L of water. we can just plug it into the equation, [tex]\frac{1}{2}[/tex].
thus, the molarity will be 0.5 M
hope this helped! ♡
What happens to water when it freezes?
a) it expands.
b) it forms vapor
c) its density increases.
d) its composition changes
Answer:
it expands
Explanation:
Answer:
a) it expands.
Explanation:
Water is more dense when it is a liquid, and less dense as a solid. This is why ice floats above water.
Hence, Ice expands when it freezes.
A radioactive nucleus emits a beta particle, then the parent and daughter nuclei are
⇢Isotones
⇢Isotopes
⇢Isomers
⇢Isobars
Answer:
isobars
Explanation:
How?
A radioactive nucleus emits beta particle(Like uranium,radium) So the mass numbers are same for daughter nuclei .They have different atomic numbes .So they are isobars
1. What happens when an environment reaches its carrying capacity?
A. The population will decrease B. The population will increase
C. The resources will be unlimited
D. Nothing will happen.
Answer: b. population will decrease
Explanation:
since earth only has a finite amount of resources, it could only support a set amount of people. once these sources can no longer be used, the population will decrease because resources can no longer support the population.
10) How can you find the density of any gas at standard conditions?
Can someone do this fill in the blanks
Answer: aragon is in group 0
2. It’s a non metal
3. Group number
Explanation:
Justify why sound cannot travel through space.
Answer:
Sound does not travel at all in space. The vacuum of outer space has essentially zero air. Because sound is just vibrating air, space has no air to vibrate and therefore no sound.
rate brainliest!
Calculate the volume of 1.5 M nitric acid required to neutralize 30.0 mL of 7.0 M sodium
hydroxide.
HNO3 (aq) + NaOH (aq) → H2O (l) + NaNO3 (aq)
Answer:
0.14 liters nitric acid
Explanation:
Molarity = moles / liter
7.0 M = x / 0.03 L
= 0.21 moles NaOH
0.21 moles NaOH x ( 1 mole HNO3 / 1 mole NaOH) = 0.21 moles HNO3
Molarity = moles / liter
1.5 M = 0.21 moles / x
x = 0.21 moles / 1.5 M
x = 0.14 Liters HNO3
Answer:
[tex]140mL[/tex]
Explanation:
[tex]M_1V_1=M_2V_2[/tex]
[tex]M_1=1.5M[/tex] molarity of nitric acid
[tex]V_1=?[/tex] volume of nitric acid
[tex]M_2=7.0M[/tex] molarity of sodium hydroxide
[tex]V_2=30.0mL[/tex] volume of sodium hydroxide
[tex](1.5M)(V_1)=(7.0M)(30.0mL)[/tex]
[tex]V_1 =\frac{(7.0M)(30.0mL)}{1.5M}=140mL[/tex]
Hope this helps whoever needs it :)
Have a good day!!!
Consider the reaction 3CH4(g)→C3H8(g)+2H2(g).
Calculate ΔG at 298 K if the reaction mixture consists of 41 atm of CH4 , 0.013 atm of C3H8 , and 2.3×10−2 atm of H2 .
Given:
ΔH for...
CH4 = -74.8 C3H8 = -103.85 H2 = 0
ΔS for...
CH4 = 0.1863 C3H8 = 0.2699 H2 = 0.13058
ΔG for...
CH4 = -50.8 C3H8 = -23.4 H2 = 0
ΔG at 298 K = 128.9 kJ
From the calculations performed, the free energy change for the reaction is 72 kJ/mol.
What is the equilibrium constant?The equilibrium constant is a value that shows the extent to which reactants have been converted to products.
Given that the equation of the reaction is;
3CH4(g)→C3H8(g)+2H2(g)
Then;
PC3H8 = 0.013 atm
PH2 = 2.3×10−2 atm
PCH4 = 41 atm
Now;
ΔG = ΔG° + RTlnQ
ΔG°reaction = ΔG°products - ΔG°reactants
ΔG°reaction = [( -23.4) +2(0)] - 3(-50.8)
ΔG°reaction = 129 kJ/mol
Q = PC3H8 * PH2^2/PCH4^3
Q = 0.013 * (2.3×10−2)^2/( 41)^3
Q = 6.877 * 10^-6/68921
Q= 9.9* 10^-11
Hence;
ΔG = 129 * 10^3 + [8.314 * 298 * (ln 9.9* 10^-11 )]
ΔG = 129 * 10^3 - 57073
ΔG = 72 kJ/mol
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Draw the alkyl bromide(s) you would use in a malonic ester synthesis of ethyl 2-methylbutanoate
The structure of the alkyl bromides used in a malonic ester synthesis of ethyl 2-methyl-4-pentenoate are as drawn in the attached image.
Ethyl 2-methyl-4-pentenoate by Malonic ester synthesis.The malonic ester synthesis is a chemical reaction characterized by the alkylation of diethyl malonate or a similar ester of malonic acid at the carbon alpha (directly adjacent) to both carbonyl groups, and subsequently converted to a substituted acetic acid.
Hence, it follows from the structure of Ethyl 2-methyl-4-pentenoate that the alkyl bromides used are Ethyl bromide and methyl bromide.
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Alkyl bromide is a compound that contains a halogen atom in alkane based structure. The structure of the alkyl bromides is attached in the image below.
What is Malonic ester synthesis?Malonic ester synthesis is the alkylation of an ester of malonic acid or diethyl malonate at alpha carbon and is converted to substituted acetic acid.
In malonic ester synthesis of ethyl 2-methyl butanoate, ethyl bromide and methyl bromide are the alkyl bromides used and their images are attached below.
Therefore, alkyl bromides used in the synthesis are ethyl bromide and methyl bromide.
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) Which direction does thermal energy flow in the following diagram? *
2 points
Heat flows from the ice cream to the hand.
Heat flows from the hand to the ice cream.
The system is too cold for heat to move.
Answer:
the heat flows from the hand to the ice cream
Explanation:
we produce body heat therefore it moves to the ice cream also there is no possible way the heat could move from the ice cream because the ice cream is cold
Heat flows from the hand to the ice cream. Therefore, the correct option is option B among all the given options.
What is thermal energy?When the temperature rises, a type of energy called thermal energy is produced. The amount of thermal energy usually directly inversely proportional to the object's change in temperature. Thermal energy takes the form of heat. The thermal energy of a substance increases with temperature.
The quicker movements of the substance's atoms and molecules are what cause thermal energy to rise as temperature rises. In some cases, a substance's molecules will separate from one another and leave because the temperature has such high. Unexpectedly, thermal energy also affects the states of matter. Heat flows from the hand to the ice cream.
Therefore, the correct option is option B.
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SCIENCE help pls need kna
I answered your question in the photo sent
Good luch
Determine the mass of sodium acetate necessary to produce 100 ml of an acetate buffer
Explanation:
Ethanoic acid is a weak acid and dissociates:
C
H
3
C
O
O
H
⇌
C
H
3
C
O
O
−
+
H
+
For which
K
a
=
[
C
H
3
C
O
O
−
]
[
H
+
]
[
C
H
3
C
O
O
H
]
=
1.8
×
10
−
5
Please remember that these are equilibrium concentrations .
p
K
a
=
−
log
K
a
=
−
log
[
1.8
×
10
−
5
]
=
4.74
n
=
c
×
v
∴
n
C
H
3
C
O
O
H
=
0.20
×
200.0
1000
=
0.04
Which particle model diagram represents xenon at stp?
The model that should show the corresct representation of xenon gas is one in which the gas molecules are isolated and monoatomic.
What is a noble gas?A noble gas is a member of group 18 of the periodic table. Noble gases are known not to interact with each other and occur as monoatomic particles.
The images are not shown here hence the question is incomplete. However, we do know that any of the models that show individual monoatomic particles is a representation of xenon gas.
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Perform the following operation
and express the answer in
scientific notation.
9.2x10^7 ÷ 3.7x10^9
Answer:
coefficient green : 2.4865
exponent (yellow) : 16
Explanation:
The specific heat capacity of iron 0. 45 j/gk. Find the molar heat capacity for iron
Answer:
The final temperature of the sample is 21.004 °C
Explanation:
The molar heat capacity for iron is 25.130 J/g.c joules per gram per Kelvin.
What is molar heat capacity?The amount of heat needed to increase one temperature of one mole of a substance is called molar heat capacity.
By the formula [tex]\rm \Delta T^\circ c = \Delta Tk[/tex]
Given that c = 0.45 J/g.C
Molar mass of iron is 55.845
Then putting the values in the equation
[tex]c= 0.45 \times 55.845 \\\\c= 25.130 \;J/g.^\circ c[/tex]
Thus, the molar heat capacity for iron is 25.130 J/g.c
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An unknown gas with a mass of 205 g occupies a volume of 20.0 L at 273 K and 1.00 atm. What is the molar mass of this compound?
The molar mass of this compound is 0.004 m/g
Firstly, molar mass is moles/grams so we need to solve for the number of moles and we were already given the grams (205 g).
So to solve for moles we were given 205 g, 20.0 L, 273 K and 1.00 atm. Knowing these numbers we can plug them into the ideal gas law, PV=nRT
where P is pressure, V is volume, n is number of moles, R is the gas constant (in this case it is 0.08206) and T is the temperature.
[tex]PV=nRT\\\\n=\frac{PV}{RT}\\\\n=\frac{1.00*20.0}{0.08206*273} =0.893[/tex]
Next, we use moles and grams to solve for molar mass:
[tex]\frac{0.893}{205} =0.004[/tex]
how many molecules are required to produce 15.8 moles of no2
✥ So, in 1.25 moles of NO2, you would have 1.25 moles of N and (2 x 1.25) 2.50 moles of O.
0.1 mole = Avogadro's number of particles (approx. 6.022x10^23 particles/mol)
So, #oxygen atoms = 2.50 mol x 6.022x10^23 atoms/mol
6.022x10^23 atoms/molOr, approximately 1.51x10^24 oxygen atoms.
Hope this answer helps you ✨
The compound below is treated with chlorine in the presence of light. Draw the structure for the organic radical species produced by reaction of the compound with a chlorine atom. Assume reaction occurs at the weakest c-h bond.
Explanation:
A carbon radical is a reaction intermediate, which is produced during a free-radical reaction. These carbon radicals contain one unpaired electron on a carbon atom. Hence, these radicals are highly reactive in nature.
A free-radical reaction results in the production of a carbon radical as a reaction intermediate.
What is radical in chemistry?A radical in chemistry is indeed an atom, molecule, and ion that possesses one least one unpaired electron electron. The term "radical" is sometimes used to refer to a free radical. These unpaired electrons provide radicals, with a few exceptions, a high degree of chemical reactivity. Radicals frequently dimerize on their own. The majority of organic radicals have brief lives.
A free-radical reaction results in the production of a carbon radical as a reaction intermediate. One unpaired electron is present on the carbon atom in these radical forms of carbon. As a result, the nature of these radicals is very reactive.
Therefore, a free-radical reaction results in the production of a carbon radical as a reaction intermediate.
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At the top of a hill, an athlete on a skateboard has X joules of mechanical energy. How much mechanical energy will she have at the bottom of the hill? Ignore the effects of friction. X joules less than X joules more than X joules There is not enough information to know.
If an athlete has X joules of mechanical energy at the top of the hill, he will have the same X amount of energy at the bottom of the hill.
What is mechanical energy?Mechanical energy is the addition of kinetic and potential energy. It can be either kinetic or potential energy.
It is the energy possessed by the position or the motion of the body.
It is the energy present to perform any work.
So, the athlete will have X joule of energy at the top and bottom of the hill.
Thus, the correct option is a, X joules.
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Answer:
X Joules
Explanation:
Given what you observe at the molecular/atomic level, why would surface area have this effect?
Answer:
Increasing the surface area of a reactant increases the frequency of collisions and increases the reaction rate. Several smaller particles have more surface area than one large particle. The more surface area that is available for particles to collide, the faster the reaction will occur.
Explanation:
:)
What is the effect Coriolis effect
The Coriolis effect is a natural phenomenon in which objects appear to be deflected as they travel around and above the Earth. The Earth is always rotating, or spinning, from west to east. It completes a full rotation every 24 hours. The Coriolis effect is caused by this rotation.
Carbon is the main constituent of hydrocarbons. Why some are called unsaturated hydrocarbon? Briefly describe.
Some hydrocarbons are regarded as unsaturated because they contain double or triple bonds between adjacent carbon atoms.
What are hydrocarbons?Hydrocarbons are any organic compounds that contain hydrogen and carbon in its structure.
Hydrocarbons can be grouped into the following based on whether they contain single or double bonds:
Saturated hydrocarbons - contain only single bonds e.g. alkanesUnsaturated hydrocarbons - contain double and triple bonds e.g. alkenesTherefore, it can be said that some hydrocarbons are regarded as unsaturated because they contain double or triple bonds between adjacent carbon atoms.
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Stirring iced tea mix into water is a chemical change?
Answer:
true
Explanation:
it changes the chemicals in the water and adds new ones
Which of the following statements is true?
1. The molar mass of Oz is 48 g/mol
2. A 100-gram sample contains at least 2 moles of Oz
3. 48 grams of O3 contains 6. 02 x 1023 molecules of Oz
The molar mass of Oz is 48 g/mol is true.
What is the molar mass of a substance?Molar mass of a substance is the mass of 1 mole of that substance or it is the number of grams per mole of a substance. The units for molar mass is grams/mole.
Therefore,The molar mass of Oz is 48 g/mol is correct because ozone have three oxygen and the molar mass of one oxygen is 16g/mol.
Ozone= 16×3
Ozone=48g/mol.
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how are organelles specialized to perform various tasks in a cell?
Answer:
Organelles are structures within a cell that perform specific functions like controlling cell growth and producing energy. Plant and animal cells can contain similar types of organelles. However, certain organelles can only be found in plant cells and certain organelles can only be found in animal cells.
An ice freezer behind a restaurant has a freon leak, releasing 41.44 g of C2H2F3Cl into the air every week. If the leak is not fixed, how many kilograms of fluorine will be released into the air over 6 months? Assume there are 4 weeks in a month. mass of fluorine leaked over 6 months
Answer:
994.56
Explanation:
41.44 multiplied by 4, that gives us a month.
Then multiply by 6.
Which location represents a period on a periodic table?.
Jesse is riding the bus home from school. He is moving away at 30 miles per hour. From which reference point would this description be correct? A. Jesse's home B. the driver of the bus C. the school D. another student on the bus
Answer:
the correct answer is going to be the school
How many moles of hydrochloric acid are in 500. Ml of a 0. 300 m solution?.
Answer:
300
Explanation:
because it's not highly concentrated