Answer: The molarity of 8 grams of an aqueous solution of sodium hydroxide in 2 liters of solute is 0.1 M
Explanation:
Given: Mass of solute = 8 g
Volume of solution = 2 L
Molar mass of NaOH is 40 g/mol.
Number of moles of NaOH are calculated as follows.
[tex]No. of moles = \frac{mass}{molar mass}\\= \frac{8 g}{40 g/mol}\\= 0.2 mol[/tex]
As molarity is the number of moles of solute present in a liter of solution. Therefore, molarity of given solution is calculated as follows.
[tex]Molarity = \frac{no. of moles}{Volume (in L)}\\= \frac{0.2 mol}{2 L}\\= 0.1 M[/tex]
Thus, we can conclude that the molarity of 8 grams of an aqueous solution of sodium hydroxide in 2 liters of solute is 0.1 M.
Gold can undergo transmutation. Superscript 185 Subscript 79 Baseline Upper A u right arrow Superscript 181 Subscript 77 Baseline Upper I r + Superscript 4 Subscript 2 Baseline Upper H e This type of nuclear decay is called .
Answer:
Alpha Decay
Explanation:
Answer:
The answer for this would be Alpha Decay
Explanation:
If this is a late answer I apologize but I hope others may find this helpful :)
4. Would the ball and cotton hit the ground the same way it does here on Earth on the moon?
Answer:
Technically yes as the mass is constant...
The mass has no effect on the force of gravitation hence the ball and cotton would hit the ground the same way it does here on Earth on the moon.
What is force?Force is defined as a cause which is capable of changing the motion of an object. It can cause an object which has mass to change it's velocity. It is also simply a push or a pull . It has both magnitude as well as direction.Hence, it is a vector quantity.
It has SI units of Newton and is represented by'F'.Newton's second law states that force which acts on an object is equal to momentum which changes with time. If mass of object is constant, acceleration is directly proportional to net force acting on an object.
The concepts which related to force are thrust and torque .Thrust increases the velocity of an object and torque produces change in rotational speed of an object.
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Which procedure is an attempt to correct a genetic disorder by replacing a mutated gene with a normal allele?
O selective breeding
• cloning
O artificial selection
•
gene therapy
gene therapy
Explanation:
Gene therapy, also called gene transfer therapy, the introduction of a normal gene into an individual's order to repair a mutation that causes a genetic disease.
Answer:
C artificial selection
Explanation:
Brainly please
What do you measure in an experiment to determine reaction rate?
Group of answer choices
A. Amount of reactants
B. Amount of products
C. Temperature
D. Time
POSSIBLE POINT
An engine cylinder contains 250.0 mL of gas at a pressure of 1.00 atm. As the engine runs, it compresses the cylinder, reducing the volume of the
25.0 mL. What is the new pressure of the gas at this volume?
Answer: The new pressure of the gas at this volume is 10 atm.
Explanation:
Given: [tex]V_{1}[/tex] = 250 mL, [tex]P_{1}[/tex] = 1.00 atm
[tex]V_{2}[/tex] = 25.0 mL, [tex]P_{2}[/tex] = ?
According to Boyle's law, at constant temperature the pressure of an ideal gas is inversely proportional to volume.
Therefore, formula used is as follows.
[tex]P_{1}V_{1} = P_{2}V_{2}[/tex]
Substitute the values into above formula as follows.
[tex]P_{1}V_{1} = P_{2}V_{2}\\1.00 atm \times 250.0 mL = P_{2} \times 25.0 mL\\P_{2} = 10 atm[/tex]
Thus, we can conclude that the new pressure of the gas at this volume is 10 atm.
What does renewable energy resource mean?
Answer:
Renewable energy is energy from sources that are naturally replenishing but flow-limited; renewable resources are virtually inexhaustible in duration but limited in the amount of energy that is available per unit of time. The major types of renewable energy sources are. Biomass. Wood and wood waste.
Explanation:
Answer:
A renewable resource is one that can be used repeatedly and does not run out because it is naturally replaced.
Explanation:
how many moles of NaCl can be formed from 6 moles of Cl2?
Answer:
12 moles
Explanation:
Studying the decay of radioactive isotopes in dead organisms helps scientists to identify fossilized remains. The ratio of C-12 to C-14 in the atmosphere is 1 x 1012. The table shows this ratio inside the body of three organisms.
C12/C14 Ratio
Organism C12/C14 Ratio
E 8 x 1012
F 1 x 1012
G 4 x 1012
What can most likely be concluded from the above information?
Only Organism F is alive, and Organism G died before Organism E.
Only Organism F is alive, and Organism E died before Organism G.
Only Organism E is alive, and Organism G died before Organism F.
Only Organism E is alive, and Organism F died before Organism G.
Answer:
Only Organism E is alive, and organism G died before Organism F
Explanation:
I did the test and got it right
If the amount of gas and volume are constant and you double the temperature of the gas, pressure halves
pressure remains the same
the pressure doubles
the pressure quadruples
Explanation:
if we fix the temperature, we are just left with PV = constant for the gas law. So, in this situation, if the volume is doubled, the pressure must go down by one-half. And vice-versa. The simplest illustration of this would be a cylinder with a plunger on one end: if you push the plunger in so that the volume of the cylinder is halved and the temperature remains constant, then the pressure will double.
4.
Which of the following is an adaptation of an animal that lives in an area with a polar
climate?
(1 point)
O thin, long legs
O thick, insulating fur
O colorful feathers
O moist, slimy body
Answer:
thick, insulating fur
Explanation:
If an animal lives in a freezing climate, it makes sense logically that the animal would adapt and develop a layer of thick fur to keep its body insulated and maintain homeostasis.
Hope this helped and please consider a Brainliest! :)
Name the Scientist
(a) Who discovered nucleus?
(b) Who stated about stationary orbits?
(c) Who discovered canal rays?
(d) Who discovered neutron?
(e) Who said that atoms are indivisible?
(a) What are isobars? Give one example.
(b)Write two differences between isobars and isotopes.
(c) Write any two uses of isotopes.
Answer:
A. Ernest Rutherford
B.Bohr
C. Eugen Goldstein
D.. Santiago Ramon y cajal
E.john Dalton
F.isobars - a line drawn on a weather map connecting points of equal pressure is called isobars.
example.. argon 40
potassium 40
.two differences between isobars and isotopes.
isobars are those elements which have different atomic number but the same mass number. while isotopes are those elements having the same atomic number and different mass number..
two uses of isotopes.
uranium 235 - for nuclear fission and as fuel in unclear reactors.
# an isotope cobalt - used In the treatment for cancer
# an isotope iodine - used in treatment of goiter.
if you were givin 2.50 moles of.sodium bromide, how many grams of salt do you have
Answer: 257.23
Explanation:
Why is it appropriate to describe the Sun and its orbiting celestial bodies as a system?
As the bodies present in the gravitational force of sun, so it is appropriate to describe the sun and its celestial bodies as system.
What are celestial bodied?Celestial bodies are those objects which are present in the space not in the land.
In the space all the planets are present in their orbitals under the gravitational force of the sun and do the motion around the sun, because of that force planets are present in the orderly arrangement. Because of the revolution of the earth around the sun, seasons will change on the earth.
Hence, it is appropriate to describe the sun and its celestial bodies as system.
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Consider this reaction and answer the questions:
Upper K upper C l upper O subscript 3 right arrow upper K upper C l plus upper O subscript 2.
What is the oxidation number of chlorine in the reactant state?
What is the oxidation number of oxygen in the reactant state?
What is the oxidation number of potassium in the reactant state?
What is the oxidation number of chlorine in the product state?
What is the oxidation number of oxygen in the product state?
What is the oxidation number of potassium in the product state?
Balanced chemical reaction: 2KClO₃ → 2KCl + 3O₂.
Potassium is metal from first group of Periodic table of elements, it has always oxidation number in compound +1.
Chlorine in the reactant state has oxidation number +5 (+1 + x + 3 · (-2) = 0) and it is reduced to -1 (+1 + x = 0) in the product state.
Oxygen in the reactant state has oxidation number -2 (+1 + 5 + 3 · x = 0) and it is oxidized to 0 (in molecule of oxygen) in the product state.
Consider this reaction and answer the questions:
Upper K upper C l upper O subscript 3 right arrow upper K upper C l plus upper O subscript 2.
What is the oxidation number of chlorine in the reactant state?
+5
What is the oxidation number of oxygen in the reactant state?
-2
What is the oxidation number of potassium in the reactant state?
+1
What is the oxidation number of chlorine in the product state?
-1
What is the oxidation number of oxygen in the product state?
0
What is the oxidation number of potassium in the product state?
+1
Percent yield is the quantity of product actually produced compared to the quantity _______.
a. the limiting reactant
b. volatile materials
c. of expected product
d. the excess reactant
Answer:
Of expected product
Explanation:
Percent yield is the quantity of product actually produced compared to the quantity of expected product and the correct option is option C.
What is the percent yield?Percent yield is the ratio of actual yield divided by theoretical yield multiplied by 100. It gives information regarding the percentage of products formed in the reaction.
Percentage yield = Actual yield / Theoretical yield × 100
Percent yield is very important in the manufacture of products.
Percent yields are understandably less than 100%, however, percent yields greater than 100% are possible if the measured product of the reaction contains impurities that cause its mass to be greater than it actually would be if the product was pure.
Theoretical yield is the expected amount of products formed in the reaction.
Therefore, percent yield is the quantity of product actually produced compared to the quantity of expected product and the correct option is option C.
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Hey fill in the missing temperatures in this chart zoom in if you can’t see it take a screenshot or sum : Please help me will mark brainliest and be geniune .
The lower temperature of the air is there more water vapor can hold True or false. Help!!!!!
Answer:
true
Explanation:
Do I just have to put H2O behind these red equations ?
Answer:
let's do no.3
Na2O+H2SO4 > Na2SO4 +H2O
Al2O3+3H2SO4>Al2(SO4)3+3H2O
the three before the sulphuric acid is such that the equation balances on both ends
...hope this helps
In a reacting flask, 500 cm3 hydrogen is mixed with 500 cm3 oxygen and is ignited. (a) Which reactant is the limiting reagent? (b) Calculate the mass of water formed.
Answer:
See Explanation
Explanation:
From Gay-Lussac's law of combining volumes;
Equation of the reaction; 2H2(g) + O2(g) -------> 2H2O(g)
Ratio of volumes; 2 : 1 : 2
Initial volumes; 500cm^3 500cm^3 0 cm^3
Reacting volumes; 500cm^3 250cm^3 500cm^3
Final Volumes; 0 cm^3 250 cm^3 500 cm^3
We can easily see from the table that the limiting reactant is oxygen.
Hence, the mass of water formed is obtained from;
1 mole of gaseous water occupies 22400 cm^3
x moles of water occupies 500cm^3
x = 500cm^3 * 1 mole/22400 cm^3
x = 0.022 moles of water
Mass of water = 0.022 moles of water * 18 g/mol
Mass of water = 0.396 g
(ii) Arrange the following metals in decreasing order of their reactivity:
Fe, Zn, Na, Cu, Ag
Answer:
Given Elements are
Ferrus(Fe)Zinc(Zinc)Sodium (Na)Copper (Cu)Silver(Ag)Decreasing Order:-Na>Zn>Fe>Cu>Ag
Explanation:-Here is the reactivity series of elements to let you understand better .[tex]\setlength{\unitlength}{0.8 cm}\begin{picture}(20,15)\thicklines\put(5,9.5){\large {\boxed{ \sf{Reactivity \: series}}}}\put(0.8,8){\large\sf K \qquad\qquad\qquad Potassium\qquad\qquad\qquad \: maximum}\put(0.8,7.2){\large\sf Na \qquad\qquad\qquad Sodium\qquad\qquad\qquad\quad \: reactivity}\put(0.8,6.2){\large\sf Ca\qquad\qquad\qquad \: Calcium}\put(0.8,5.2){\large\sf Mg\qquad\qquad\quad \: Magnesium}\put(0.8,4.2){\large\sf Al\qquad\qquad\qquad \: Aluminium\qquad\qquad\qquad \: decreasing}\put(0.8,3.2){\large\sf Zn\qquad\qquad\quad\qquad \: Zinc\qquad\qquad\qquad\qquad \:reactivity}\put(0.8,2.2){\large\sf Fe\qquad\qquad\quad\qquad Ferrous}\put(0.8,1.2){\large\sf Pb\qquad\qquad\qquad \: \:\: Lead}\put(0.8,0.2){\large\sf H\qquad\qquad\qquad \: \:Hydrogen}\put(0.8, - 0.6){\large\sf Cu\qquad\qquad\qquad \: Copper}\put(0.8, - 1.5){\large\sf Hg\qquad\qquad\qquad \: Mercury}\put(0.8, - 2.5){\large\sf Ag\qquad\qquad\qquad \: \:Silver}\put(0.8, - 3.5){\large\sf Au\qquad\qquad\qquad \: \: Gold\qquad\qquad\qquad\quad \: \: minimum reactivity}\put(9.3,8.2){\vector(0, - 2){12}}\end{picture}[/tex]
Steel wool turns from a gray color to a reddish color after it gets wet and then sits on a counter. Is this a sign of a chemical or physical change? PLEASE ANSWER ASAP!
Answer: Steel wool turns from a gray color to a reddish color after it gets wet and then sits on a counter is a sign of chemical change.
Explanation:
A change that brings change in chemical composition of a substance is called a chemical change.
For example, Steel wool turns from a gray color to a reddish color after it gets wet and then sits on a counter is a chemical change.
This is because steel wool is mostly made up of iron and when iron becomes wet then in the presence of air it gets oxidized and therefore, it gets corroded.
This corrosion appears as reddish color of steel wool and it represents a chemical change has occurred in the steel wool.
Thus, we can conclude that steel wool turns from a gray color to a reddish color after it gets wet and then sits on a counter is a sign of chemical change.
What makes lava flow in the manner that it does
Answer:
Lava flows are streams of molten rock that pour or ooze from an erupting vent. Lava is erupted during either nonexplosive activity or explosive lava fountains. ... But when basalt lava flows are confined within a channel or lava tube on a steep slope, the main body of the flow can reach velocities >30 km/h (19 mph).
Explanation:
The kinetic molecule theory assumes that the particles of an ideal gas
Explanation:
It is assumed that the particles of an ideal gas have no such attractive forces. The motion of each particle is completely independent of the motion of all other particles. The average kinetic energy of gas particles is dependent upon the temperature of the gas.
A container with a fixed volume, filled with hydrogen gas at -104 C and 71.8 kpa is heated until the pressure reaches 225.9 kpa.
What is the temperature of the hydrogen gas in degrees Celsius?
Answer:
Temperature= -327.2 celsius
Explanation:
You can set up an equation:
-104 = x
71.8 225.9
Label each reactant in the reaction below as a proton donor or a proton acceptor and as acidic or basic H2Co3 +H20---------HC0-3+h30+
Answer:
Proton donor - H2CO3
Proton acceptor - H2O
Explanation:
The balanced reaction is
H2CO3 +H2O---------HCO3 - + h3O+
Here, water molecule i.e H2O has one additional H + ion hence it has accepted the hydrogen atom.
This additional hydrogen atom has been donated by H2CO3 thereby reducing itself to HCO3-
Hence,
Proton donor - H2CO3
Proton acceptor - H2O
In the given reaction, a proton donor is H₂CO₃ and proton acceptor is H₂O.
What is Bronsted-Lowry theory?Bronsted-Lowry theory states that those substances which gives proton or (H⁺ ion) are known as acids and those which accepts proton or (H⁺ ion) are known as bases.
Given chemical reaction is:
H₂CO₃ + H₂O → HCO₃⁻ + H₃O⁺
In the above reaction H₂CO₃ gives H⁺ ion to the water molecule and H₂O accepts H⁺ ion for the formation of HCO₃⁻ & H₃O⁺. So, H₂CO₃ is a proton donor and behaves as acid and H₂O is a proton acceptor and behaves as base.
Hence, H₂CO₃ is a proton donor and H₂O is a proton acceptor.
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Why are substances such as coal and gasoline used as fuel sources?
A.They have high kinetic energy, which can be converted into electrical or mechanical
energy
B.They have large amounts of energy stored in the chemical bonds which can be
converted into kinetic energy when combusted
C.They are able to easily make endothermic reactions, which can be harnessed and
converted into mechanical energy
D. None of the above statements are true
Answer:
A.They have high kinetic energy, which can be converted into electrical or mechanical energy
Explanation:
The kinetic energy of the fast-moving water turns turbines, which drive generators that produce electricity. The energy in fossil fuels (coal, oil, gas) is Chemical Potential Energy.
14. What are the different types of river in Nepal ?explain them briefly
Answer:
21
Explanation:
Given each of the following sets of values for an ideal gas, calculate the unknown quantity.
a) P = 773 mm Hg; n = 0.240 mol; T = 25 C. What is the volume (in L)?
b) V = 635 mL; n = 0.0947 mol; T = 309 K. What is the pressure (in mm Hg)?
c) P = 727 mm Hg; V = 13.3 L; n = 0.393 mol. What is the temperature (in K)?
Answer:
a. 5.77L
b. 700mmHg
c. 395K
Explanation:
Using PV = nRT we can solve these problems where:
P is pressure of the gas in atm (1atm = 760mmHg)
V is volume in liters
n are moles of the gas
R is gas constant: 0.082atmL/molK
T is asbolute temperature in K
a. PV = nRT
V = nRT/P
P = 773mmHg*(1atm/760mmHg) = 1.017atm
T = 25°C+273 = 298K
V = 0.240mol*0.082atmL/molK*298K / 1.017atm
V = 5.77L
b. PV = nRT
P = nRT/V
P = 0.0947mol*0.082atmL/molK*309K/0.635L
P = 0.9216atm * (760mmHg/1atm) = 700mmHg
c. PV = nRT
PV/nR = T
P = 727mmHg * (1atm / 760mmHg) = 0.9566atm
0.9566atm*13.3L/0.393mol*0.082atmL/molK = T
T = 395K
What is the number of first and last vertical column?
Answer:
Modern periodic table has eighteen (18) vertical columns. These are called groups
What are the consequences of NOT wearing a mask?