Answer:52M
Explanation:
use S= 1000w/ MV
Here, s= molarity
w= the amount of NaCl
M= the atomic mass of NaCl
V= the volume of solution
A 0.0795-g sample of magnesium metal reacts with hydrochloric acid to give 88.5 mL of hydrogen gas at 25 degree C and 766 mm Hg.
Required:
a. Calculate the moles of hydrogen gas produced.
b. Calculate the molar volume of hydrogen gas at STP.
c. What are major sources of experimental error?
Answer:
(a). 0.0037 mol.
(b). 22.42 L
(c). => When the measuring apparatus are not precise.
=> Error due to parallax.
=> Random errors.
Explanation:
Without mincing words let us dive straight into the solution to the question above. So, we are given the following parameters or information which are going to aid in solving this particular Question;
Mass of magnesium given= 0.0795 g, volume of Hydrogen = 88.5 mL = 0.0885 L, temperature = 25 degree C = 273 + 25 = 298K and pressure = 766 mm Hg = 766/760 = 1.00789 atm.
(a). In order to determine the number of moles of Hydrogen atoms,we will be making use of the formula below;
Number of moles = (pressure × Volume)/ gas constant,R × Temperature.
Thus,the number of moles of Hydrogen = 1.00789 × 0.0885 / [( 0.08206 × 298] = 0.0037 mol.
(b). The molar volume at stp can be calculated by using the same formula that was used in (a) above;
Molar Volume at stp = Gas constant,R × temperature/ Pressure = 0.08206 × 273 / 1 atm = 22.42 L.
(c). The major sources of errors are given below:
=> When the measuring apparatus are not precise.
=> Error due to parallax.
=> Random errors.
Question 7
Anna is rolling a ball down a hill. As the ball rolls, the potential energy is changed to which type of energy?
A chemical energy
B
kinetic energy
С
light energy
D
stored energy
There is about 30 g of Californium-252 left, how much time has elapsed?
You haven't provided two critical pieces of info needed to answer this question. First, what's the half-life of Californium-252, and second, what's the initial amount of Californium-252. Given these two values, you can then set up an exponential equation to find the time elapsed.
Different isotopes of the same element must have a different
Answer:
they must have same atomic number and different atomic mass
please helpppppppppppp
Answer:
The answer would be cation
Explanation:
Answer:
it's an anion
if it has more electrons than protons, then it has a negative net charge making it an anion
For doping silicon with boron, silicon specimen was kept in gaseous atmosphere containing B2O3 that maintained the B concentration at the surface of Si specimen at the level of 3*10^26 boron atoms/m^3. The process was carried out at 1100 degrees C. The diffusion coefficient of B in Si at 1100 degrees C is 4*10^-13 cm^2/s. Calculate the concentration of B at the depth of 10^-4 cm from the surface after 130 minutes of diffusion at 1100 degrees C
Solution :
From Fick's law:
[tex]$\frac{D_{AB}}{\Delta z } \times (C_{A1}-C_{A2})=N_a$[/tex]
Mass balance: Exits = Accumulation
[tex]-N_A A = \frac{dm}{dt}[/tex]
[tex]-N_A A = \frac{dVp}{dt}[/tex]
[tex]-N_A A = \frac{dV}{dt}p[/tex]
[tex]-N_A A = \frac{dhA}{dt}[/tex]
[tex]-N_A A = \frac{dh}{dt} \times Ap[/tex]
From the last step, area cancels out and thus leaves :
[tex]-N_A = \frac{dh}{dt} \times p[/tex]
So now we can substitute the [tex]$N_A$[/tex] by the Fick's law
[tex]$\frac{D_{AB}}{\Delta z } \times (C_{A1}-C_{A2})=\frac{dh}{dt} p$[/tex]
Substituting the values we get
[tex]$=\frac{-4 \times 10^{-13}}{0.0001} \times (3 \times 10^{26} - C_{A2}) = \frac{dh}{dt} \times 2.46$[/tex]
[tex]$=-4 \times 10^{-9} \times( 3 \times 10^{26} - C_{A2}) = 0.0001 \times 2.46$[/tex]
[tex]$= -7800 \times 4 \times 10^{-9} \times (3 \times 10^{26}-C_{A2})=0.000246$[/tex][tex]$=-(3 \times 10^{26}-C_{A2}) = 7.8846 \times 100 \times \frac{1}{69.62} \times 6.022 \times 10^{23}$[/tex]
[tex]$C_{A2} = 6.85 \times 10^{28} \ \text{ boron atoms} /m^3$[/tex]
Use the graph to answer these questions. The total energy of the reactants is –3,811.92 kJ. –1,273.02 kJ. –2,538.90 kJ.
Answer:
its -3,811.92 aka.) A
Explanation:
The overall enthalpy of the reaction is represented in the graph by the letter A. The activation energy is represented by the letter B and the activated complex is represented by C.
What is an energy diagram of a reaction ?The energy diagram of a reaction represents the energy change with respect to the rate of the reaction. It clearly depicts the energy profile of reactants and products, transition state of the reaction, activation energy and the overall enthalpy of the reaction.
The given diagram represents the energy profile for the photosynthetic reaction. The state with the highest activation energy is called transition state of the reaction. The minimum energy that must be acquired by the reactants to overcome the barrier potential is called activation energy.
For the given graph, the activation energy is represented by the letter B. The overall enthalpy of the reaction is represented in the graph by the letter A and the activated complex is represented by C.
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Your question is incomplete. But your complete question probably was:
Letter__shows the overall enthalpy of reaction.
Letter___shows the activation energy for the reaction
The activated complex is represented by
Daniella found an iron metal cube. The volume of the cube is 20 cm3 as shown below.
non
20.0 cm
If the density of iron is 7.9 g/cm3, what is the mass in grams of this iron cube?
A) 0.395 g
B) 2.53 g
C) 27.99
D) 158 g
Answer:b) 2.53
Explanation:
H* ions increase in concentration at lower pH values.
Calculate how many more H" ions there are in a solution
at a pH =2 than in a solution at a pH =6. Find the
concentration of H* ions at a pH =2 and at a pH=6 in
Table B. Then divide the concentration of Ht ions at a
pH =2 by the of H* ions at a pH = 6. Record your answer
in Table C
the concentration of H* ions at a pH =2 = 10⁻²
the concentration of H* ions at a pH =6 = 10⁻⁶
a solution with a pH of 2 has 10⁴ times more hydrogen ions than a solution with a pH of 6
Further explanationThe concentration of H + ions in solution is measured in pH units. The greater the concentration of H + ions, the more acidic the solution will be, and vice versa if the concentration of H + ions is getting smaller, the more basic the solution and the greater the hydroxide concentration
The ph unit is on a scale between 0-14.
pH> 7, the solution is said to be alkaline
pH <7, the solution is said to be acidic
pH = 7, the solution is said to be neutral
Acidic solutions will have more hydrogen ions than hydroxide ions
A solution with a different value of n has a 10ⁿ difference in the concentration of H⁺ ions.
pH can be formulated:
[tex]\tt \boxed{\bold{pH=-log[H^+]}}[/tex]
the concentration of H* ions at a pH =2[tex]\tt 2=-log[H^+]\\\\(H^+]=10^{-2}[/tex]
the concentration of H* ions at a pH =6[tex]\tt 6=-log[H^+]\\\\(H^+]=10^{-6}[/tex]
pH 2 and pH 6
[tex]\tt \dfrac{10^{-2}}{10^{-6}}=10^4[/tex]
So a solution with a pH of 2 has 10⁴ times more hydrogen ions than a solution with a pH of 6
This image shows the development of what climate phenomenon?
Answer:
Rain shadow
Explanation:
Climate is the average weather condition of a place over a long period of time.
The image shows a rain shadow effect around a mountainous region. The type of rainfall controlled this way is known as an orographic rainfall.
On the leeward side which is the opposite side of where the rain cloud forms, there is dryness and lack of rainfall. As moist air rises along the edge of the windward side, cloud forms. This windward side receives a significant amount of rainfall The windward side is hit with cold and dry wind and it is barren.eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee
Answer:
oxidation
Explanation:
the process or result of oxidizing or being oxidized.
hope this helpppppppppppppeddddddd
NOT A TEST AND I WILL GIVE BRAINLEIST DON'T ANSWER IF YOU DON'T KNOW
Which particles are in the nucleus of an atom? What are their charges?
Which particles orbit the outside of the atom? What is their charge?
Answer:
In the nucleus of an atom ,there are protons & neutrons. Protons have charge of 1.6× 10^-19 C, while neutrons have 0C charges. Electrons orbit outside the atom. Their charge is - 1.6 ×10^-19C
Explanation:
Guys please help me I have a final exam
a 20.0 l tank of co2 contains 68.0 grams of gas at 500.0 kpa of pressure what is the temperature of the tank ?
Explanation:
ok that is ans k............
The temperature of the 20 L tank containing 68 g of carbon dioxide, CO₂ at 500 KPa is 778.5 K
How to determine the mole of CO₂Mass of CO₂ = 68 gMolar mass of CO₂ = 44 g/mol Mole of CO₂ =?Mole = mass / molar mass
Mole of CO₂ = 68 / 44
Mole of CO₂ = 1.545 moles
How to determine the temperature Volume (V) = 20 L Number of mole (n) = 1.545 moles Pressure (P) = 500 KPa Gas constant (R) = 8.314 LKPa/Kmol Temperature (T) =?Using the ideal gas equation, the temperature of the gas can be obtained as follow:
PV = nRT
Divide both side by nR
T = PV / nR
T = (500 × 20) / (1.545 × 8.314)
T = 778.5 K
Thus, the temperature of the tank is 778.5 K
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What happens at the cathode in an electrolytic cell?
(Answer is reduction)
Answer:
At the cathode in an electrolytic cell, ions in the surrounding solution are reduced into atoms, which precipitate or plate out on to the solid cathode. The anode is where oxidation takes place, and the cathode is where reduction takes place.
Explanation:
Since positive ions pick up electrons at the negatively charged cathode, reduction takes place there.
What is reduction?The process of obtaining electrons or a decrease in an element's oxidation state in such a chemical reaction would be known as reduction, which is the movement of electrons among species. An increase in the number of electrons connected to a single or a collection of atoms is the result of a reduction chemical process.
What is electrons?The electron would be a subatomic particle with a negative one elementary charge electric charge. Due to their lack of components or substructure, electrons, which are part of the lepton particle family's first generation, have been typically regarded to be elementary particles.
In an electrolytic cell, the cathode is where ions in the neighboring medium could be converted into atoms, which then plate out or precipitated onto the solid cathode. Both oxidation and reduction occur at the anode but also cathode, respectively.
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Why do you think it is important that the procedures of a science lab report be written so that another person could perform your experiment exactly the way you performed it?
Answer:
for example the company has been in the United kingdom for women who have a lot to say it is not the only one that has the best of
Explanation:
get a little bit more of the year and
Answer:
for example the company has been in the United kingdom for women who have a lot to say it is not the only one that has the best of
Explanation:
If the world suffered a huge catastrophic event (an event causing great and often sudden damage or suffering; a disaster) that wiped out almost all the organisms. Who would have the best chance of repopulation the world with living organisms, an asexual reproducing organism or a sexually reproducing organism? Explain your answer.
Answer:
An asexually reproducing organism would have the best chance of repopulating the world.
Explanation:
Sexual reproduction is a method of reproduction that involves two parents and the formation and subsequent fusion of male and female gametes during fertilization. On the other hand, In asexual reproduction, only one parent is involved and produces offspring by making copies of itself through various methods such as binary fusion, budding and vegetatively.
In a case of a catastrophic event that wiped out almost all organisms, an organism that reproduces asexually have a greater chance of repopulating the world because of the following advantages in reproducing asexually:
1. Only one parent is needed, therefore reproduction is easier.
2. It isaves time and energy. Since almost all organisms have been wiped out, there is a lesser likelihood of finding a compatible mate, so reproducing asexually will give the organism a better chance.
3. It occurs at a very fast rate; much faster than sexual reproduction
4. The population can increase very quickly and colonization of new habitats is much easier.
All these advantages will give the esexually reproducig organism a fairer chance to repopulate the world.
Give equation to show the reaction between Na and the following;H2O,H2,Graphite,O2,Cl2,Pb,NH3
Answer:
Answered below
Explanation:
1) 2Na (s) + 2H2O (l) → 2NaOH (aq) + H2 (g)
2) 2Na (s) + H2 (g) → 2NaH (s)
3) Formula for graphite is C.
Thus;
Na + C → NaC
4) 2Na (s) + O2 (g) → 2Na_2O_2 (s)
5) 2Na (s) + Cl2 (g) → 2NaCl (s)
6) Na + Pb → NaPb
7) Na (s) + NH3 (g) → NaNH2 (s) + H2 (g)
How many electrons are there in a chlorine ion?
Answer:
17 for chlorine atom ; 18 electrons for a chlorine ion
Which statement is FALSE?
A) Reproduction requires a lot of energy!
B) Some organisms choose not to reproduce because it uses too much energy.
C) Some organisms die after giving birth to their offspring. (Offspring means children).
D) Some organisms may fight to the death to mate with a female.
1. A force of 30N is applied to a screwdriver to pry the lid off of a can of paint. The
screwdriver applies 90N of force to the lid. What is the MA of the screwdriver?
Answer:
120N
Explanation:
Answer:
3
Explanation:
Load / Effort
The effort is 30N and the Load is 90N.
So the MA is equal to 90/30 = 3
which statement is right please explain giving brainliest
Answer:
D
Explanation:
Because if I said its 35 degrees outside that has nothing to do with climate maybe if I said its usually 35 degrees in the month of December but just saying what temperature it doesn't tell you anything about climate
Well, the definition of climate is the weather conditions prevailing in an area in general or over a long period so I don't really know
So maybe it is d
Answer:
B
Explanation:
Weather refers to the short-term conditions of the lower atmosphere, such as precipitation, temperature, humidity, wind direction, wind speed, and atmospheric pressure. It could be sunny, cloudy, rainy, foggy, cold, hot, windy, stormy, snowing … the list goes on.
How many hydrogen atoms are in 1.50 x 10(22) molecules of water. Show your work.
A. 1.5 H atoms
B. 1.5 x 10(22) H atoms
C. 3 H atoms
D. 3 x 10(22) H atoms
Answer:
option B is a right answer
Explanation:
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calculate the volume of pure water that used to dilute 100 ml of 12 M NaOH to 4.75 M.
Answer:
152.63 ml.
Explanation:
By proportion to get a 4.75 M solution the volume will be
(12/4.75) * 100 = 252.63 ml
So the answer is 152.63 ml.
molarity=number of moles/volume
First we find the number of moles of NaOH we have the molarity and the volume we transform mililiters in liters 100ml=0.1l
12=n/0.1 n=1.2 moles of NaOH
now we find the volume of the second solution
4.75=1.2/V
V=1.2/4.75=0.252l
0.252-0.1=0.152liters=152ml of pure water used to dilute
In lonic bonding, atoms
share electrons
are connected by strong electrical forces
lose protons and form ions
stop moving completely
12. An electron moving around the nucleus possesses two types of energies which are
Answer:
they bonding
Explanation:
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This process transforms_______ energy from the sun into chemical energy in the form of ______ which the plant can use to live and grow.
Answer:
uifhiuwrhuio fw
Explanation:
hfuiwehgu34iht3uht34[pht349348ut0tg
Which molecule has a structure that is most like aspirin?
O propene
O octyne
O benzene
O butane
Pls pls help me!
The molecule which has a structure that is most like aspirin is benzene.
What is aspirin?Aspirin, also known as acetylsalicylic acid, is a pain reliever, fever reducer, and inflammation reducer.
In the structure of aspirin one aromatic ring is present in which carboxylic group is present and molecular formula of aspirin is written as C₉H₈O₄.
Propene, octyne and butane are aliphatic compounds.Benzene has a common structure with aspirin as they both have aromatic ring in it.Hence benzene has a structure that is most like aspirin.
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At 25 °C, what is the hydroxide ion concentration, [OH-], in an aqueous solution with a hydrogen ion concentration of
[H+1=4.1 x 10-5 M?
[OH) =
M
The hydroxide ion concentration, [OH-] = 2.439 x 10⁻¹⁰
Further explanationEquilibrium of water and the ions :
[tex]\tt 2H_2O(l)\rightarrow H_3O^+(aq)+OH^-(aq)[/tex]
[tex]\tt Kc=\dfrac{[H_3O^+][OH^-]}{H_2O}[/tex]
Kc[H₂O] is the ion equilibrium constant for water ⇒ Kw.
The product of the concentrations of these ions (H₃O⁺ and OH⁻)at equilibrium at 25°C is 1.0 x 10⁻¹⁴ M
[H₃O⁺] [OH⁻] = 1.0 x 10⁻¹⁴ M = Kw
The hydrogen ion concentration of [H⁺]=4.1 x 10⁻⁵ M, so the hydroxide ion concentration, [OH-] :
[tex]\tt 4.1\times 10^{-5}\times [OH^-]=1.10^{-14}\\\\(OH^-]=\dfrac{1.10^{-14}}{4.1\times 10^{-5}}\\\\(OH^-]=2.439\times 10^{-10}[/tex]
Sodium hydrogen carbonate, on heating, produces sodium carbonate, water and carbon dioxide.
A recipe for chocolate chip cookies requires 1.5 dm' of carbon dioxide.
Calculate the mass of sodium hydrogen carbonate that should be used at R.T.P.
INa = 23; H = 1: C = 12; O = 16.]
[Note that 1 mole of gas occupies a volume of 24,000 cm at room temperature and pressure (RTP)]
The mass of sodium hydrogen carbonate : 10.5 g
Further explanationGiven
1.5 dm' of CO₂
1 mol gas= 24 L at RTP(25 °C, 1 atm)
Required
the mass of sodium hydrogen carbonate
Solution
Decomposition reaction of Sodium hydrogen carbonate :
2 NaHCO₃ (s) ⇒ Na₂ CO₃ (s) + H₂ O(g) + CO₂ (g)
mol CO₂ :
[tex]\tt mol=\dfrac{1.5}{24}=0.0625[/tex]
From the equation, mol ratio of NaHCO₃ : CO₂ (g) = 2 : 1, so mol NaHCO₃ :
[tex]\tt 2\times 0.0625=0.125[/tex]
Mass NaHCO₃(MW=23+1+12+3.16=84 g/mol) :
[tex]\tt mass=mol\times MW\\\\mass=0.125\times 84\\\\mass=10.5[/tex]
which part of the mushroom gathers nutrients from the soil or dead material that the mushroom is decomposing?
Answer:
The Mycelium is usually hidden in the soil, in wood, or another food source. A Mycelium may fill a single ant or cover many acres.