Answer:
Molarity =Moles of solute/Volume of Solution (L)
Molarity=2.5/2.6
=0.962M
All solutions must be a liquid-liquid combination.
True
False
how many grams of KOH do we need to make 250.0ml of a 0.75 M
Answer:
10.52g KOH
Explanation:
250.0 ml X 1L/1000ml X 0.75 mol KOH/1L X 56.105gKOH/1 mol KOH =10.52g KOH
A gas occupies 400.0 mL at 20.00 C and 70.00 kPa. What will the pressure be at 40.00 C and 200.0 mL ?
Answer: The new pressure is 280 kPa.
Explanation:
Given: [tex]V_{1}[/tex] = 400.0 mL, [tex]T_{1} = 20^{o}C[/tex] , [tex]P_{1}[/tex] = 70.0 kPa
[tex]V_{2}[/tex] = 200.0 mL, [tex]T_{2} = 40.0^{o}C[/tex], [tex]P_{2}[/tex] = ?
Now, combined gas law is used to calculate the new pressure as follows.
[tex]\frac{P_{1}V_{1}}{T_{1}} = \frac{P_{2}V_{2}}{T_{2}}[/tex]
Substitute the values into above formula as follows.
[tex]\frac{P_{1}V_{1}}{T_{1}} = \frac{P_{2}V_{2}}{T_{2}}\\\frac{70.0 kPa \times 400.0 mL}{20^{o}C} = \frac{P_{2} \times 200.0 mL}{40.0^{o}C}\\P_{2} = 280 kPa[/tex]
Thus, we can conclude that the new pressure is 280 kPa.
does Earth's atmosphere carry gases and this affects our weather constantly. true or false
the correct answer is True
the volume of the balloon was 4.21L when the temperature was 25.0°C, what will the volume of the balloon be when the temperature is 50.0°C?
If the volume of the balloon was 4.21L when the temperature was 25.0°C, 8.42L will be the volume of the balloon be when the temperature is 50.0°C. if Mass and pressure is constant.
What is the relation between Volume and temperature?The volume of a fixed mass of gas is linearly proportional to temperature at given constant pressure. In simple words the volume of a fixed mass of a gas reduces when it is cooled and increases when the temperature is raised.Hence, in the above case it is shown that temperature is rising twice of its original value so, the volume of that given mass of gas in the balloon will also increase by twice.
Solution:
4.21L=25.0°C
4.21L×2=50.0°C
8.42L=50.0°C
8.42L will be the volume of the balloon be when the temperature is 50.0°C.
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Bauxite ore contains aluminum oxide, which is decomposed using electricity to
produce aluminum metal and oxygen. What mass of aluminum metal can be
produced from 125 g of aluminum oxide?
Answer:
66.48 g.
Explanation:
Bauxite ore contains aluminium oxide which is decomposed using electricity to produce aluminium metal and oxygen gas
Calculate the pH if:
[H+] = 9.2 x 10^-8 M
Answer:
7.04Explanation:
The pH of a solution can be found by using the formula
[tex]pH = - log ([ {H}^{+} ])[/tex]
From the question we have
[tex]pH = - log(9.2 \times {10}^{ - 8} ) \\ = 7.0362...[/tex]
We have the final answer as
7.04Hope this helps you
Name the only Australian mammal who is restricted to the alpine environment? ...
What is the age of the Sun? ...
What happens when lightening hit the tree? ...
What is the name of the tallest grass of the world? ...
What is the average height of Bamboo?
Nitrogen monoxide and oxygen can be formed from the thermal decomposition of nitrogen dioxide.
2NO2 (g) = 2NO (g) + O₂(g)
In an experiment, 4 moles of nitrogen dioxide were put into a 1.0 dm³ container and heated
to a constant temperature. The equilibrium mixture contains 0.8 moles of oxygen.
What is the value of the equilibrium constant, Kc?
1.5 POINTS
A
C
E
LU
0.032
0.853
0.426
B
D
0.222
0.356
FINISH QUIZ
Answer:
0.355 moldm^-3
Explanation:
Small amount of acid is added to Water during electrolysis of water . Why?
Answer:
Water doesn't have ions that are needed to pass the electricity so in order to increase the no of ions we poor acid into the water. Just increasing the no ions will increase the electricity flow faster
Without doing a calculation, arrange the following group of molecules in order of decreasing standard molar entropy (S^o ):
hexane (C6H14), benzene (C6H6), cyclohexane (C6H12)
a. C6H14 > C6H6 > C6H12
b. C6H6 > C6H12 > C6H14
c. C6H12 > C6H14 > C6H6
d. C6H14 > C6H12 > C6H6
e. C6H12 > C6H6 > C6H14
f. C6H6 > C6H14 > C6H12
Answer:
d. C6H14 > C6H12 > C6H6
Explanation:
Standard molar entropy has to do with the number of atoms that are present in each of the species. The greater the number of atoms possessed by the species, the higher the value of the standard molar entropy due to a greater number of vibration modes.
Hexane (C6H14) has the highest number of atoms followed by cyclohexane (C6H12) and lastly benzene (C6H6).
Thus the order of decreasing molar entropy is; C6H14 > C6H12 > C6H6.
List all the metals in the alkaline earth metals group
Answer:
beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra).
Alkaline earth metals are those that have two valence electrons in their outermost shell.
Barium (Ba), Radium (Ra), Strontium (Sr), Magnesium (Mg), Calcium (Ca), and Beryllium (Be) are the six alkaline earth metals.
By donating their outermost electrons, they take on the noble gas electron configuration, which increases their stability. When electrons are transferred to an atom with an electronegative charge, the alkaline earth metals get a positive charge.
The second column of the periodic table contains alkaline earth metals, which are very reactive metals. These metals are the building blocks of the entire world. These metals are typically found as sulfates in nature.
A few examples of minerals are gypsum, calcium sulfate, epsomite, magnesium sulfate, barite, and barium sulfate.
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Nitrogen monoxide and oxygen gas combine to form smog. How many mols of nitrogen dioxide NO2 is produced when 34 L of oxygen 02
gas reacts.
Explanation:
Please provide the chemical reaction to allow others to help solve this problem. Assuming the system is in STP, then use the molar volume to solve for the moles of Oxygen and then use the mole ratio to determine the moles of NO2 that is produced as a result of this reactant
[tex] \sf { \fcolorbox{green}{g}{What is \: the diffrence between alkali and base in simple defination}} [/tex]
Answer:
All alkalies are bases but all bases are not alkaliesall alkalies are soluble in water but all bases are not alkalies .hope it is helpful to you
Answer:
[tex] \sf { \fcolorbox{green}{g}{\: the diffrence between alkali and base in simple defination are:}} [/tex]
[tex] \sf { \fcolorbox{green}{g}{\:All alkalies are bases but all bases are not alkalies }} [/tex][tex] \sf { \fcolorbox{green}{g}{\:all alkalies are soluble in water but all bases are not alkalies. }} [/tex]student titrated 15.00 mL of HCl of an unknown concentration with a solution of 0.0670 M NaOH. This titration used 19.06 mL of the 0.0670 M NaOH to reach the end point. Determine the concentration of the unknown HCl in one set up. You may look at the steps used in the previous problem to recall what fractions need to be in the set-up to solve this problem. 1. Fill in the fractions required to determine the concentration of HCl.
Answer:
The concentration of the unknown HCl is 0.0851 M.
Explanation:
The equation of neutralization:
[tex]n_1M_1V_1=n_2M_2V_2[/tex]
Where:
[tex]n_1[/tex]= Basicity of acid
[tex]n_2[/tex] = Acidity of base
[tex]M_1[/tex]= concentration of acid
[tex]M_2[/tex]= concentration of base
[tex]V_1[/tex] = Volume of acid used in neutralization
[tex]V_2[/tex] = Volume of base used in neutralization
We have:
The acidity of HCl = [tex]n_1=1[/tex]
The concentration of HCl solution used = [tex]M_1=?[/tex]
The volume of HCl used in titration =[tex]V_1= 15.00 mL[/tex]
The acidity of NaOH =[tex]n_2=1[/tex]
The concentration of NaOH solution used = [tex]M_2=0.0670 M[/tex]
The volume of NaOH used in titration =[tex]V_2= 19.06 mL[/tex]
[tex]n_1M_1V_1=n_2M_2V_2\\1\times M_1\times 15.00 mL=1\times 0.0670 M\times 19.06 mL\\M_1=\frac{1\times 0.0670 M\times 19.06 mL}{1\tines 15.00 mL}\\M_1=0.085135 M\approx 0.0851 M[/tex]
The concentration of the unknown HCl is 0.0851 M.
Which of the following relations are functions?
What is the coefficient of H2O when the following equation is properly balanced with the smallest set of whole numbers?
Answer:
the correct answer is 6...
Answer:
The answer is 2
You can change a subscript in an equation, but you cannot change the
coefficient.
O True
O False
Answer:
false
because you can't change a subscript ,
but you can change the coefficient.
Which of these is an example of a physical property?
A. Iron combines with oxygen to rust.
B. Potassium reacts in water to form a base.
C. Sodium metal is soft and malleable.
D. Sodium ignites when placed in water.
Option C. Sodium metal is soft and malleable is an example of a physical property.
What is a physical property?A physical property can be defined as any feature of a substance that can be really observed and also measured without changing its chemical composition such as for example, the color, density of a metal, boiling point, conductivity, etc.
Therefore, with this data, we can see that physical properties have a significant impact on the performance and use of a given chemical product and they are associated with intrinsic features of the chemical material that forms molecules.
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Waste management is important for the environment. Waste can cause pollution and disease if it is
not handled properly. There are many different methods of waste management to help ease the
environmental pressures imposed by waste. Modern methods include recycling, composting,
incineration, sustainability, landfill, integration, waste-to-energy, and waste minimization. The
planet depends on a successful approach to waste disposal.
Landfills are waste disposal sites. They are often man-made depressions in the ground covered with a
lining designed to prevent any leakage of waste materials. However, landfills can leak through the base
resulting in negative impacts on the surrounding environments. What negative impact to the
environment is caused by the production of methane gas in landfills?
A
air pollution
B)
soil fertility
groundwater pollution
D)
air pollution, groundwater pollution, soil fertility
Answer:
air pollution, groundwater pollution, soil fertility
Answer:air pollution
Explanation:
its a gas, so it will mainly effect the air
please help me! ASAP
Answer:
(1) 4- ethyl -6 methyl -2 octyne
What would be the electron configuration for neutral oxygen? Please show what energy level each electron is in using the electron diagonal filling rule do not use noble gas configuration.
Answer: 1s2 2s2 2p4
Explanation:
Recall the number of electrons an orbital can have:
s orbitals have 2, p orbitals have 6, d orbitals have 10, f orbitals have 14, and so on.
Oxygen in its neutral state would have 8 electrons.
To summarize the diagonal filling order, it goes from the least energy level to the most, and the orbital with the least amount of orbitals to the most.
So, the order for this will go from 1 and end at 2 (for energy level,) then s, s again (as energy level 1 has 1s orbital only,) and p.
So, the first energy level, 1s2 (2 electrons), leaves the remaining six electrons.
Completely fill the s orbital (another 2 electrons), and the remaining 4 electrons will be in the respective p orbital.
Thus, it is 1s2 2s2 2p4.
Which one of the following pairs are the common languages of science?
A. English & Latin
B. Mathematics & Units
C. Standards & Measures
D. English & French
Answer:
a whole new world too be into
Explanation:
1 atm = 760 torr
For isooctane:
For tetramethylbutane:
There is no other feasible arrangement of “tetramethylbutane” it is redundant in this circumstance.
What is Tetramethylbutane?Tetramethylbutane, often known as hexamethylethane, is a hydrocarbon with the chemical formula C8H18 or (H3C-)3C-C(-CH3)3. It is the most branching and compact of the several octane isomers, as well as the only one having a butane (C4) backbone.
It has a highly symmetrical structure, a high melting point, and a narrow liquid range; in fact, it is the smallest saturated acyclic hydrocarbon that emerges as a solid at 25 °C. (Cubane, C8H8, is much smaller and solid at room temperature among cyclic hydrocarbons.) It is also the most stable C8H18 isomer, with a lower heat of formation of 4.18 kcal/mol (17.5 kJ/mol) than n-octane, which has been related to dispersive interactions (electron correlation) between the methyl groups (protobranching).
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Explain how a cold compress used by
athletes is an endothermic or exothermic
reaction.
Please helppp
Answer: A cold compress used by athletes is an endothermic reaction.
Explanation:
A pack of cold compress used by athletes contains water that holds another bag or tube inside it which is filled with ammonium nitrate fertilizer.
So, on hitting the cold compress the tube breaks down due to which fertilizer gets mixed with water. This mixture absorbs the heat when placed on the area of body having pain, strain or bump.
As a result, we tend to feel cold at the affected area of our body.
Thus, we can conclude that a cold compress used by athletes is an endothermic reaction.
For the reaction C + 2H2 → CH4, how many grams of carbon are required to produce 14 moles of methane, CH4 ?
Round your answer to the nearest tenth. If you answer is a whole number like 4, report the answer as 4.0
Use the following molar masses. If you do not use these masses, the computer will mark your answer incorrect.:
Element Molar Mass
Hydrogen 1
Carbon 12
The amount, in grams, of carbon required to produce 14 moles of methane according to the reaction would be 168.0 grams.
Stoichiometric problemFrom the balanced equation of the reaction, the mole ratio of the carbon that reacts and the methane produced is 1:1. In other words, 1 mole of carbon will produce 1 mole of methane.
Thus, for the production of 14 moles of methane:
1 mole methane = 1 mole carbon
14 moles methane = 14 x 1/1 = 14 moles carbon.
Recall that, mass = mole x molar mass.
The molar weight of carbon is given as 12 g/mol
Mass of 14 moles carbon = 14 x 12 = 168 grams
In other words, for the illustrated reaction, the amount of carbon required to produce 14 moles of methane would be 168.0 grams.
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Please i need help with this it is Which of the following is not a property of matter that you could use to distinguish one substance from another.
Answer:
I believe it's mass? I may be wrong though...
What is the distinction between electronic and ionic conduction? Answer: When a current arises from a flow of Choose the answer from the menu for the missing word in the middle of the sentence in accordance to the question statement electrons , the conduction is termed electronic; for ionic conduction, the current results from the net motion of Choose the answer from the menu for the missing word at the end of the sentence in accordance to the question statement ions .
Answer:
Electronic conduction is the movement of electrons whereas ionic conduction is the movement of ions.
Explanation:
When a current arises from a flow of electrons, the conduction is termed as electronic conduction while on the other hand, for ionic conduction, the current results from the net motion of ions from one atom to another. The difference between electronic and ionic conduction is that electronic conduction refers to the movement of electrons from one region to another, whereas ionic conduction is the movement of ions from one atom to another during bond formation.
Draw the Lewis structure (including resonance structures) for methyl azide (CH3N3). For each resonance structure, assign formal charges to all atoms that have formal charge. Draw the Lewis structure (including resonance structures) for methyl azide (CH3N3). For each resonance structure, assign formal charges to all atoms that have formal charge.
Answer:
N atom ( bounded to two Nitrogen atoms ) has a + formal charge while the N atom bounded to only one (1) Nitrogen atom has a - formal charge .
Explanation:
Diagram Lewis structure of methyl azide ( attached below )
Generally CH3N3 has two(2) resonance structures
What is found in both structures is that the N atom ( bounded to two Nitrogen atoms ) has a + formal charge while the N atom bounded to only one (1) Nitrogen atom has a - formal charge .
Attached below are the two resonance structures
What is the empirical formula of a compound consisting of 48.64% C, 8.16% H, and 43.20% O by mass? Assume 100.0g total of unknown compound.
Answer:
empirical formula of the compound is CH2O
Explanation: