If nitrogen gas is collected over water at 20 o C and the total pressure of the gas in the collection vessel is 200 kPa, what is the pressure of dry nitrogen gas?
Answer:
Explanation:
pressure of dry nitrogen gas at 20° = Partial pressure of nitrogen and partial pressure of water at that temperature .
The pressure of dry nitrogen gas= total pressure - vapour pressure of water at 20°C
= 200 k Pa - 2.34 k Pa
= 197.66 kPa.
90 grams of glucose, C6H12O6, is dissolved in 2 liters of solution. Determine the molarity (M).
Answer:
0.25 M
Explanation:
The first step is to determine how many moles of glucose there are, which means first finding out the molar mass of glucose. Carbon has a molar mass of about 12, hydrogen 1, and oxygen 16, so the total molar mass of glucose is about 6(12)+12(1)+6(16)=180 grams. This means that 90 grams is half a mole. Half a mole of substance divided by two liters of solution is (1/2)/2=1/4, or a molarity of 0.25. Hope this helps!
What is the molarity of a solution that is made by adding 57.3 g of MgO to 500.0 mL of solution?
Answer:
2.843 M
Explanation:
Molarity = moles / volume
Milliliters to liters:
500 mL = .500 L
Grams to moles:
MgO molar mass = 16.00 + 24.31 = 40.31 g/mol
57.3 g x 1 mol / 40.31 g = 1.421 mol
Molarity:
1.421 mol / .500 L = 2.843 M
The rules of engagement (roe) working group is often used to _____. (select all that apply.)
Answer:
proactively develop ROE as well as responding to requests for additional ROE measures
Explanation:
The rules of engagement (roe) working group is a group who's main job is to proactively develop ROE as well as responding to requests for additional ROE measures. Rules of Engagement are a set or rules or directives for military soldiers that define the circumstances, conditions, degree, and manner in which the use of force can be used.
Which compound is part of the structure of another compound listed?
A. amino acids
B. nucleic acids
C. proteins
Answer:
i think its a
Explanation:
nucleic acids are dna and rna
amino acids are the 4 nuecleotides in dna or rna
Answer:
amino acids i think
Explanation:
Find the pH of HCl with a concentration of 0.00006M
Round to the nearest whole number
Answer:
4.22
Explanation:
pH stands for potential hydrogen. The letter “p” denotes potential and the letter “H” denotes hydrogen.
pH helps to find the acidity or alkalinity of an aqueous solution.
The number of hydrogen ions (protons) present in a solution is determined by the pH scale.
A pH greater than 7 makes the water more alkaline and a pH less than 7 makes the water more acidic.
[tex]pH=-\log [H^+]=-\log [0.00006]=4.22[/tex]
Plants absorb nutrients, help plants grow. Which level of organizqtion best describes this interaction between plants and soil? A) population B) organismos C) community D) ecosystem
Answer:
ecosystem
Explanation:
An ecosystem includes all of the living things (plants, animals and organisms) in a given area, interacting with each other, and also with their non-living environments (weather, earth, sun, soil, climate, atmosphere). The living and nonliving components of the ecosystem are linked together through nutrient cycles and energy flows. Ecosystems are of any size, but usually they are in particular places.
In an ecosystem, plants depend on the soil for nutrients. These nutrients are cycled in nature by the various biogeochemical cycles within the ecosystem. The ecosystem is a self sustaining unit in terms of materials and energy flow.
Answer:
D. ecosystem
Explanation:
An ecosystem is a large community of living organisms (plants, animals and microbes) in a particular area. The living and physical components are linked together through nutrient cycles and energy flows.
In an ecosystem there is symbiotic relationship which entails each living organism contributes to the well being of the other and the entire population.
What is the mass of 13 gold atoms?
Answer:
uuuh 4.25191 × 10-21 grams????
Explanation:
Given 700 ml of oxygen at 7 ºC and 106.6 kPa pressure, what volume does it take at 27ºC and 66.6 kPa pressure
Answer:
The volume is 1.2L
Explanation:
Initial volume (V1) = 700mL = 0.7L
Initial temperature (T1) = 7°C = (7 + 273.15)K = 280.15K
Initial pressure = 106.6kPa = 106600Pa
Final temperature (T2) = 27°C = (27 + 273.15)K = 300.15K
Final pressure (P2) = 66.6kPa = 66600Pa
Final volume (V2) = ?
To solve this question, we need to use combined gas equation which is a combination of Boyle's law, Charles Law and pressure law.
(P1 × V1) / T1 = (P2 × V2) / T2
solve for V2 by making it the subject of formula,
P1 × V1 × T2 = P2 × V2 × T1
V2 = (P1 × V1 × T2) / (P2 × T1)
V2 = (106600 × 0.7 × 300.15) / (66600 × 280.15)
V2 = 22397193 / 18657990
V2 = 1.2L
The final volume of the gas is 1.2L
Os etapas que devem sem compridas para obter separadamente os componentes (a as substâncias ) de uma mistura de água ,sal e areia ,são respectivamente : A) filtração e sifonação B) decantação e sifonação C) filtração e destilação simples D) catação e decantação
Answer:
The steps that must be long to obtain separately the components (to the substances) of a mixture of water, salt and sand, are respectively: A) filtration and siphoning B) decanting and siphoning C) simple filtration and distillation D) collection and decantation.
Simple filtration and Siphoning is the method. When an insoluble solid is present in a liquid. Filtration is the ideal method of separation,The sand is filtered by the filtered paper as water is allowed to pass through the filter paper into a beaker where the funnel which hold the filter paper emptied into.
Water molecules is Siphoned, pull by force of gravity through the sand, past the filter paper to emerge as clean in the beaker below.
What is the formula for an ionic compound that is composed of potassium and oxygen?
Answer:
Ty for free points :)
Explanation:
Clasifica los siguientes elementos en metales, no metales, metaloides , o gases , nobles : flúor , azufre , nitrogeno , cloro , magnesio , helio , sodio , bromo , silicio , telurio
Answer:
Translation:
Classify the following elements into metals, nonmetals, metalloids, or gases, noble : fluorine, sulfur, nitrogen, chlorine, magnesium, helium, sodium, bromine, silicon, tellurium.
Metals: magnesium and sodium.Nonmetals: fluorine, chlorine, bromine, sulfur and nitrogen.Metalloids: silicon and tellurium.Noble gases: helium.Explanation:
Metals: They occupy the left and central areas of the Periodic Table; therefore, they constitute a majority group of the elements.
Nonmetals: They are located in the upper right region of the Periodic Table.
Within the Periodic Table, the metalloids lie diagonally from boron to polonium. Items above on the right are nonmetals, and items below on the left are metals.
The noble gases are located in group 18 of the Periodic Table.
Answer:
fluorine: it is a gas at room temperature
sulfur: it is a metal
nitrogen: it is a diatomic gas
chlorine: it is a halogen
helium: it is a gas
sodium: alkali metal
magnesium: metal
bromine: halogen
silicon: metalloid
tellurium: it is a semi-metal
Explanation:
the grouping of the chemical compounds respect a location in the periodic table, and this classification exists since all the compounds have different behaviors, different melting and boiling temperatures and even different valence, oxidation, atomic masses.
Explain how electron microscopy and scanning tunneling microscopes have contributed to the understanding of atoms.
Answer:
Electron microscopy and scanning tunneling microscopes contributed to the understanding of atoms in understanding atomic structure.
The electron microscope has magnifications of about 100,000x.
This helped the scientists to have accurate image groupings of the atoms. Scanning tunnel microscope helped scientists to have the images of groups of atoms.
how do convection currents help make underwater mountains
Answer:
As they move away from each other the force makes it leave a gap between them. And the convection currents push up a lot of magma towards the surface. The magma cools of very quickly in the water. Forming rocks constantly, rocks that little by little start to make a big mass, that eventually turns into an underwater mountain, or rather a mid-ocean ridge.
(Hope this helps) Sky
Why can chemical energy and nuclear energy be considered potential energy
Answer:
Chemical potential energy is a form of potential energy related to the structural arrangement of atoms or molecules. This arrangement may be the result of chemical bonds within a molecule or otherwise. Chemical energy of a chemical substance can be transformed to other forms of energy by a chemical reaction.
The chemical energy and nuclear energy can be considered potential energy because both of them has energy stored in it.
What is potential energy?Potential energy is any form of energy that has stored potential that can be put to future use such as nuclear energy, chemical energy in which the energy is stored in it so we can conclude that chemical energy and nuclear energy can be considered potential energy due to its storage of energy.
Learn more about potential energy here: https://brainly.com/question/14427111
You are provided with a beaker, wire, two nails, battery, bulb and dilute soultions of HCl, HNO3, alcohol and glucose. How will you identify the acids from the given solutions using the given materials?
Answer:
Acid solutions will be those which lights up a bulb when a circuit is connected through them.
Explanation:
Acid solutions such as HCl and HNO3 are polar in nature and permits the flow of electricity through them. Whereas non-polar solutions like ethanol and glucose solution will not allow the flow of electricity through them.
Therefore, when an electric circuit is completed by dipping the nails connected to a battery and a bulb into the different solutions, the lighting up of the bulb indicates which solutions are acids.
Chemistry Problem
1234567890-
Answer:
what?
Explanation:
whats the answer
Answer:
oh yea! keep up the great work buddy!!
please help tq !! A B C or D ?????
Answer:
i think that the answer should be option D as the mole value is also greatest
A solution is made by diluting a standard solution by adding 25 mL of the standard solution to 75 mL of distilled water. What is the concentration of the resulting solution?
Answer:
The concentration of the resulting solution is 0.25 or one quarter of the standard solution
Explanation:
Whereby the molar concentration of the standard solution is P molar per liter, we have
25 ml of the standard solution contains
25/1000×P moles of the standard solution such that the resultant solution has a volume of 25 + 75 = 100 ml contains 0.025 P moles of the standard solution
The concentration of a solution is the number of moles contained per liter, which gives
100 ml contains 0.025 P moles
1 liter = 1000 ml will contain 1000/100 × 0.025 = 0.25 P moles of the stanard solution
Therefore, the concentration of the resulting solution is 0.25 or one quarter of the standard solution.
A quantity of Lithium reacts with sulfuric acid (H2SO4) to produce .10 g of hydrogen. How many grams of lithium are required ?
Answer:
0.35 g Li
Explanation:
H2SO4 + 2Li -> Li2SO4 + H2
7 g Li -> 2 g H2
x -> 0.10 g H2
x= (0.10 g H2 * 7 g Li)/ 2 g H2 x= 0.35 g Li
What is the molar concentration of a solution that contains 2.4 mol in 175 mL solution?
Answer:
[tex]M = 13.714\,\frac{mol}{L}[/tex]
Explanation:
The molarity is the ratio of moles solute to volume of solution. Then,
[tex]M = \frac{2.4\,mol}{\left(175\,mL\right)\cdot \left(\frac{1}{1000}\,\frac{L}{mL} \right)}[/tex]
[tex]M = 13.714\,\frac{mol}{L}[/tex]
Answer:
[tex]M=13.7\frac{mol}{L}=13.7M[/tex]
Explanation:
Hello,
In this case, we define the molar concentration or widely known as molarity as the ratio of the moles of the solute to the volume of the solution in litres. Thus, for the computation of the molar concentration we make sure we have litres:
[tex]V_{solution}=175mL*\frac{1L}{1000mL} =0.175L[/tex]
Next, we can compute the molarity in mole per litre or just molar units by:
[tex]M=\frac{n_{solute}}{V_{solution}} =\frac{2.4mol}{0.175L} \\\\M=13.7\frac{mol}{L}=13.7M[/tex]
Best regards.
what is abbreviated structural formula of the 2-metil-5-isopropiloctan?
Answer:
CH3
|
CH3- C H -CH2-CH2- CH - CH2-CH2-CH3
|
CH
/ \
CH3 CH3
Explanation:
Octan
C-C-C-C-C-C-C-C
Metyl
CH3 -
Isopropyl
CH3
/
- CH
\
CH3
2-metil-5-isopropiloctan
CH3
|
CH3- C H -CH2-CH2- CH - CH2-CH2-CH3
|
CH
/ \
CH3 CH3
As a result of the interaction of 22 g of higher oxide of the element of the main subgroup of group IV with water, 31 g of acid was formed. Set the name of an unknown chemical element.
Answer:
Carbon (C)
Explanation:
Because the element is the element of the main subgroup of group IV , it has oxidation number +4 in the oxide, and oxide formula is EO2.
reaction:
EO2 + H2O ---> H2EO3
from reaction 1 mol 1 mol 1 mol
31 g acid - 22 g oxide = 9 g water
M(H2O) = 18 g/mol
9g * 1 mol/18 g = 0.5 mol H2O
As we see from reaction molar ratios EO2 : H2O : H2EO3 = 1 : 1 : 1,
so if we have 0.5 mol H2O , we also have 0.5 mol EO2.
0.5 mol EO2 has mass 22 g.
Molar mass(EO2) = mass/ number of moles = 22 g/ 0.5 mol = 44 g/mol
Molar mass (EO2) = M(E) + 2M(O) = 44 g/mol
M(E) + 2 *16 g/mol = 44 g/mo
M(E) = 44-32 = 12 g/mol
Molar mass 12 g/ mol is molar mass of carbon.
So, element is carbon (C).
What volume would 56.2 mL of gas at 820 mm of Hg occupy at 720 mm of Hg?
Answer:
49.35 mL
Explanation:
Given: 56.2 mL of gas
To find: volume that 56.2 mL of gas at 820 mm of Hg would occupy at 720 mm of Hg
Solution:
At 820 mm of Hg, volume of gas is 56.2 mL
At 1 mm of Hg, volume of gas is [tex]\frac{56.2}{820}[/tex]
At 720 mm of Hg, volume of gas is [tex]\frac{56.2}{820}(720)=49.35\,\,mL[/tex]
Which elements occupy the same group in the periodic table?
O A. Elements that share the same row
O B. Elements that share the same inside electrons
O C. Elements that share the same period
O D. Elements that share the same column
Answer: The answer is D. Elements that share the same column
Explanation:
The elements occupying the same groups are sharing the same column. They have similar chemical and physical properties. Elements of the same group have the same number of valence electrons.
What is group in periodic table?All elements are classified to different groups and periods. The horizontal rows in the table is called periods and the vertical column are called groups in periodic table.
There are 18 groups and 7 periods in periodic table. The atomic number increases from left to right along a period. Elements in a group are having same number of valence electrons and are having similar chemical and physical properties.
Elements in a groups shows similarity in reactivity and physical properties. They show same trend in increasing or decreasing nature of physical quantities. A group is thus, representing a column in periodic table. Therefore, option D is correct.
To find more on groups in periodic table, refer here:
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Ok you smarties please HELP ME
If I initially have a gas at a pressure of 12 atm, a volume of 23 Liters and a temperature of 200K, and then I raise the pressure to 14 atm and increase the temperature to 300K, what is the new volume?
Answer:
The new volume of the gas is 29.57 Liters
Explanation:
Given;
initial pressure of gas, P₁ = 12 atm
initial volume of gas, V₁ = 23 Liters
initial temperature of gas, T₁ = 200 K
final pressure of gas, P₂ = 14 atm
final temperature of gas, T₂ = 300 K
final volume of gas, V₂ = ?
To determine the final volume of the gas, we apply general gas law;
[tex]\frac{P_1V_1}{T_1} = \frac{P_2V_2}{T_2}\\\\V_2 = \frac{P_1V_1T_2}{T_1P_2}\\\\V_2 = \frac{12*23*300}{200*14}\\\\V_2 = 29.57 \ Liters[/tex]
Therefore, the new volume of the gas is 29.57 Liters
El champú ¿es de naturaleza básica o acida? ¿Como puedes saberlo?
Answer:
Is the shampoo basic or acidic in nature? How can you know?
The shampoo by nature is of basic pH.
Explanation:
Since the basic shampoo weakens the hair by breaking the disulfide bonds of the keratin of the hair, it is sought to slightly acidify adding small flakes of various materials, for example, glycol distearate.
The shampoos hardly have the pH indicated, the most common is to see shampoo with balanced or neutral pH (pH 7). To know the pH of the shampoo you can buy pH measuring strips. A pH between 5.5 and 7 is correct.
The solubility of a gas in water is 0.66 g/L at 15 kPa of pressure. What is the solubility when the pressure is increased to 40.0 kPa?
Answer:
The correct answer to the following question will be "1.76 g/L".
Explanation:
The given values are:
P₁ = 15 kPa
Solubility of water, C₁ = 0.66 g/L
P₂ = 40.0 kPa
C₂ = ?
Now,
According to Henry's Law,
⇒ [tex]\frac{P_{1}}{P_{2}}=\frac{C_{1}}{C_{2}}[/tex]
⇒ [tex]C_{2}=\frac{C_{1}\times P_{2}}{P_{1}}[/tex]
On putting the estimated values, we get
⇒ [tex]=\frac{0.66\times 40}{15}[/tex]
⇒ [tex]=\frac{26.4}{15}[/tex]
⇒ [tex]=1.76 \ g/L[/tex]
What is work?
O A. Force times an object's displacement
B. The distance an object moves over time
C. The time it takes an object to move a certain distance
D. The force that distance makes
SUBMIT
Answer:
A:force times an object displacement
Explanation: