Answer:
120 kPa = 1.25 L
Explanation:
Because 120/1.50 is 80. And then if you divide 100 by 80, you get 1.25.
Why do solids expand on heating?
Explanation:
The molecules of solids are shrinked in there normal state . but as a heat energy is produced , the molecules starts curating fast and fast as temperature goes up . since they vibrate , they hit and collide each other breaking the bondings this increases the surface of area of the solid , and molecules consumes that space and they expand .
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
Which word equation shows hydrogen reacting with oxygen to form water?
oxygen + water Right arrow. hydrogen
hydrogen + oxygen Right arrow. water
oxygen + water Right arrow. hydrogen + water
hydrogen + water Right arrow. oxygen
Answer: hydrogen + oxygen Right arrow .water
Explanation:
The exact equation for this reaction is;
2H2 + O2 -------------> 2H2O
hydrogen + oxygen Right arrow. water is the correct option.
The equation shows hydrogen reacting with oxygen to form water is as follows:-
[tex]2H_2+O_2\rightarrow2H_2O[/tex]
The above reaction in word form is written as follows:-
[tex]hydrogen+Oxygen \rightarrow water[/tex]
So, hydrogen + oxygen Right arrow. water is the correct option.
Hydrogen-H
Oxyden-O
Water-[tex]H_2O[/tex]
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Can you help solve each question I answered incorrectly
Answer:
1.2cm
97.8mm
7cm
what do I do when my dog ate my secret 10 pound stash of chocolate and he won't move please help what do i do oh god help me pls
Answer:
call an vet ASAP 10 pounds of chocolate is very bad for a dog.
Explanation:
Chocolate is one of the worst things a dog can eat, and 10 pounds of it is worst! Take your dog to the vet IMMEDIATELY! I hope that that the dog will survive.
-------------------------------------------------------------------------------------------------------------Brainiest would make my day, but you don’t have to give it! You’re welcome.
what does it mean to say that momentum is conserved
It means that in any interaction where external impulses don't occur, the momentum of the system remains the same before and after the interaction. When a cannonball is fired, its momentum does change.
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.
if I have 22.1 grams of CO2 gas at -188 degrees Celsius and 165 ml what is the pressure of the gas in kPa
Answer:
P = 2.145kPa
Explanation:
Mass = 22.1g
Molar mass of CO2 = 44g/mol
Vol = 165mL = 0.165L
T = -188°C = (-188 + 273.15)K = 85.15K
R = 8.314J/mol.K
From ideal gas equation,
PV = nRT
P = pressure of the ideal gas
V = volume the gas occupies
n = number of moles if the gas
R = ideal gas constant
T = temperature of the gas
n = number of moles
n = mass / molar mass
n = 22.1 / 44 = 0.50moles
PV = nRT
P = nRT/ V
P = (0.5 × 8.314 × 85.15) / 0.165
P = 2145.26Pa = 2.145kPa
Pressure of the gas is 2.145kPa
Which of the following shows the solution set to the quadratic equation 8x2+40x=0
Answer:
Option 2
Explanation:
There are many ways to do it. You can also just use your scientific calculator to directly get the answer. But now I'm going to solve the equation by factoring.
8x² + 40x = 0
Factor out 8x from the expression
8x ( x + 5 ) = 0
Divide both sides by 8
8x ( x + 5 ) ÷8 = 0 ÷8
x ( x + 5 ) = 0
Now we have two factors, x & x+5. Set each factors equal to zero
x = 0
x + 5 = 0
Now solve the equation
x = 0
x = -5
Then you get the answer!
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).
Most of the costs associated with using renewable resources are due to
a. overuse of resources
b. atmospheric pollution
C. lack of availability
d. global warming
Please select the best answer from the choices provided
A
B
С
OD
Answer:
a. overuse of resources is the correct answer.
Explanation:
Renewable resources are available and they are abundant but overuse of these renewable resources will have a negative effect on the surroundings and humans.
Overuse of renewable resources will leads to the depletion of these renewable sources in the future and will also make the ecosystem unbalance.
Renewable resources are solar energy, geothermal energy, biomass energy, wind energy, hydro energy.
Thus renewable resources are threatened due to overuse and it must be carefully used.
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.
The Earth's diameter at the equators is _____ its diameter at the poles. A:greater than B:equal to C:less than
HA and HB are two strong monobasic acids. 25.0cm3 of 6.0mol/dm3 HA is mixed with 45.0cm3 of 3.0mol/dm3 HB.
What is the H+ (aq) concentration in mol/dm3 in the resulting solution ?
A 1.9
B 2.1
C 4.1
D 4.5
If anyone could explain how to reach an answer that would be so helpful !!
Answer:
The H+ (aq) concentration of the resulting solution is 4.1 mol/dm³
(Option C)
Explanation:
Given;
concentration of HA, [tex]C_A[/tex] = 6.0mol/dm³
volume of HA, [tex]V_A[/tex] = 25.0cm³, = 0.025dm³
Concentration of HB, [tex]C_B[/tex] = 3.0mol/dm³
volume of HB, [tex]V_B[/tex] = 45.0cm³ = 0.045dm³
To determine the H+ (aq) concentration in mol/dm³ in the resulting solution, we apply concentration formula;
[tex]C_iVi = C_fV_f[/tex]
where;
[tex]C_i[/tex] is initial concentration
[tex]V_i[/tex] is initial volume
[tex]C_f[/tex] is final concentration of the solution
[tex]V_f[/tex] is final volume of the solution
[tex]C_iV_i = C_fV_f\\\\Based \ on \ this\ question, we \ can \ apply\ the \ formula\ as;\\\\C_A_iV_A_i + C_B_iV_B_i = C_fV_f\\\\C_A_iV_A_i + C_B_iV_B_i = C_f(V_A_i\ +V_B_i)\\\\6*0.025 \ + 3*0.045 = C_f(0.025 + 0.045)\\\\0.285 = C_f(0.07)\\\\C_f = \frac{0.285}{0.07} = 4.07 = 4.1 \ mol/dm^3[/tex]
Therefore, the H+ (aq) concentration of the resulting solution is 4.1 mol/dm³
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.
In the early twentieth century , what was alexander fleming's hypothesis concerning the relationship between a yellow green mold and certain strains of bacteria
Answer:
Explanation:
Alexander Fleming's hypothesis was that the juice that was produced by the mold that appeared in the petri dishes was killing the bacteria growing there (streptococcus, meningococcus and the diphtheria bacillus).
Answer:
He thought the mold had released a chemical that prevented the bacteria’s growth.
Explanation:
Gradpoint
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:
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.
Chemistry Problem
1234567890-
Answer:
what?
Explanation:
whats the answer
Answer:
oh yea! keep up the great work buddy!!
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
Explain how most fish reproduce similarly?
Answer:
Fishes undergo both asexual and sexual mode of reproduction with majority of fishes reproducing by sexual mode
Explanation:
Fishes undergo sexual reproduction. The sperm from the male fuses with the eggs of females. Some of the fishes have separate female and male sexes while some are hermaphrodites and have both testes and ovaries. Some species of fishes reproduce through parthenogenesis in which female egg develops into baby fishes without fusing with a sperm cell. Due to this, the offspring are exact copies of their mothers
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]
How many moles of ammonium sulfate, (NH4)2SO4, can be made from the reaction of 30.0 mol of NH3?
A sample of gas occupies 100.0 mL at standard pressure. What volume will the gas occupy at a pressure of 80.0 mm Hg if the temperature remains constant? *
Answer:
950mL
Explanation:
The following were Data were obtained from the question:
Initial volume (V1) = 100mL
Initial pressure (P1) = stp = 760mmHg
Final pressure (P2) = 80mmHg
Final volume (V2) =..?
The final volume of the gas can be obtained by using the Boyle's law equation as follow:
P1V1 = P2V2
760 x 100 = 80 x V2
Divide both side by 80
V2 = (760 x 100) /80
V2 = 950mL
Therefore, the new volume of the gas is 950mL
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.
A 2-column table with 3 rows. Column 1 is labeled Substance with entries upper O subscript 2, upper N subscript 2, upper C upper O subscript 2. Column 2 is labeled Molar mass with entries 32.00 grams per mole, 28.02 grams per mole, and, 44.02 grams per mole.
For each pair below, select the sample that contains the largest number of moles.
Pair A
2.50 g O2
2.50 g N2
Answer:
2.50 g N2 and the second one is 21.5 g N2
Explanation:
just answered it and it was correct
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
Ok you smarties please HELP ME
What is the formula for an ionic compound that is composed of potassium and oxygen?
Answer:
Ty for free points :)
Explanation:
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.
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