Answer:
Sodium Sulphide.
Explanation:
The chemical name is sodium sulphide. The valency of the sulphide ion is 2 while the valency of sodium is 1 . That is why the molecule contains 2 sodium ions.
Answer: sodium sulphide.
Explanation:
[tex]Na_2S[/tex] is an ionic compound because sodium element is a metal and sulphur element is a non-metal. The bond formed between a metal and a non-metal is always ionic in nature.
The nomenclature of ionic compounds is given by:
1. Positive is written first.
2. The negative ion is written next and a suffix is added at the end of the negative ion. The suffix written is '-ide'.
Hence, the name of [tex]Na_2S[/tex] is sodium sulphide.
Therefore, the correct answer is sodium sulphide.
A material has a volume of 63.0 cm3 and a mass of 28 grams. What is the density of the material in g/cm3 to the correct number of significant figures?
Answer:
0.4444 g/cm³ ≅ 0.44 g/cm³ (2 significant figures).
Explanation:
Knowing that:d = m/V,
where, d is the density of the material (g/cm³).
m is the mass of the material (m = 28 g).
V is the volume of the material (V = 63.0 cm³).
∴ d = m/V = (28 g)/(63.0 cm³) = 0.4444 g/cm³ ≅ 0.44 g/cm³ (2 significant figures).
The climate of a place also depends upon the amount of water in the air. How do the rising temperatures around Earth affect the amount of water in the air? A) The water in the air evaporates because the temperature of air is rising. B) There is more water in the air because the rate of evaporation increases. C) The water in the air decreases because the water on Earth starts evaporating. D) There is less water in the air because the evaporated water falls down as rain.
Answer:
B) There is more water in the air because the rate of evaporation increases
Explanation:
As the temperatures rise across the globe, the rate of evaporation also increases, resulting in more water in the air. The reason for the increased evaporation is that the ice sheets and glaciers are melting, thus there's more liquid water. The more liquid water there is, the more evaporation there will be. As the evaporation increases, there will be an increase in the formation of clouds, thus there will be more precipitation around the world, gradually leading to warmer and wetter climate.
What is the name of the ionic compound RbCI
What's the inner core of the Jovian planets made of? A. Hydrogen compounds, solid rock, and metals B. Bacteria fossils, hydrogen compounds, and ice crystals C. Helium gas, hydrogen gas, and rocks D. Metals, helium gas, and hydrogen gas
Answer:
A. Hydrogen compounds, solid rock, and metals
Explanation:
The Jovian planets, also referred to as outer planets, are the four planets that are in the outer half of the solar system. These planets are gas giants, and they are mostly made out of gases, having much larger sizes and masses than the terrestrial planets. The inner cores of these planets also differ from the cores of the terrestrial planets. The inner cores of these planets are made out of rocks, metals, and hydrogen compounds. In general their cores are the size of the Earth, though they are much more massive.
Answer: The inner core of the Jovian planets are made of: Hydrogen compounds, solid rock, and metals.
4)
 The mixtures of sodium carbonate and calcium nitrate react to precipitate calcium carbonate and sodium nitrate. This reaction is shown by which balanced chemical equation?
4)
 The mixtures of sodium carbonate and calcium nitrate react to precipitate calcium carbonate and sodium nitrate. This reaction is shown by which ba.lanced chemical equation?
The reaction between Na2CO3 and Ca(NO3)2 to precipitate CaCO3 and NaNO3 is shown by balanced double diaplacement reaction.
Answer:
Na₂CO₃ + Ca(NO₃)₂ → CaCO₃ + 2NaNO₃
Explanation:
Sodium carbonate = Na₂CO₃Calcium nitrate = Ca(NO₃)₂Calcium carbonate = CaCO₃Sodium nitrate = NaNO₃The unbalanced reaction is:
Na₂CO₃ + Ca(NO₃)₂ → CaCO₃ + NaNO₃
We begin by balancing Na, so we put a coefficient of two in sodium nitrate:Na₂CO₃ + Ca(NO₃)₂ → CaCO₃ + 2NaNO₃
Ca is already balanced, there is 1 Ca atom in each side of the reaction.CO₃ is already balanced, there is 1 group in each side of the reaction.NO₃ is already balanced, there are 2 groups in each side.The reaction is now balanced.
Ammonia reacts with oxygen to produce nitric acid (HNO3) and water. What mass of nitric acid, in grams, can be made from 405 g of ammonia?
Express the mass to three significant figures and include the appropriate units.
The mass of nitric acid that can be produced from 405 g of ammonia is approximately 1500 g, when rounded to three significant figures.
Explanation:To determine the mass of nitric acid that can be made from 405 g of ammonia, we first need to write the balanced chemical equation for the reaction between ammonia and oxygen:
4NH3 + 5O2 -> 4HNO3 + 6H2O
This equation tells us that 4 moles of ammonia (NH3) react to produce 4 moles of nitric acid (HNO3).
The molar mass of ammonia (NH3) is approximately 17.03 g/mol. Therefore, 405 g of ammonia is equivalent to 23.77 moles (405 g / 17.03 g/mol). So, we can produce the same amount of moles of nitric acid (23.77 moles).
The molar mass of nitric acid (HNO3) is approximately 63.01 g/mol. Therefore, the mass of nitric acid that can be made from 405 g of ammonia is approximately 1497 g (23.77 moles x 63.01 g/mol). This value should be reported to three significant figures: 1500 g.
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A reaction has ∆H = −356 kJ and ∆S = −36 J/K. Calculate ∆G (kJ) at 25°C.
Answer: -345.2 KJ
Explanation: As we know that ,dG=dH-TdS
T=25+273=298 K
dG= -356 x1000-298(-36)= -356000+10728
=-345272 j
= -345.2 KJ
What is the scientific notation of 696,000 kilometers
Hello There!
The Answer Is In Image Provided.
Your Unit Is Still Kilometers
If you had a 0.5 M KCl solution, how much solute would you have in moles, and what would the solute be?
Since KCl has a molecular weight of 74.5, how many grams/L would this be?
Answer:
37.25 grams/L.
Explanation:
Molarity (M) is defined as the no. of moles of solute dissolved per 1.0 L of the solution.M = (no. of moles of KCl)/(volume of the solution (L))
∵ no. of moles of KCl = (mass of KCl)/(molar mass of KCl)
∴ M = [(mass of KCl)/(molar mass of KCl)]/(volume of the solution (L))
∴ (mass of KCl)/(volume of the solution (L)) = (M)*(molar mass of KCl) = (0.5 M)*(74.5 g/mol) = 37.25 g/L.
So, the grams/L of KCl = 37.25 grams/L.
In a 0.5 M KCl solution, there are 0.5 moles of KCl per liter. Given the molecular weight of KCl is 74.5 g/mol, this would translate to 37.25 grams of KCl per liter.
If you have a 0.5 M KCl solution, this means that the concentration of KCl in the solution is 0.5 moles per liter. To find the amount of solute in moles, you would simply use the concentration of the solution and the volume of the solution. In this case, if you have a 1-liter solution, you will have 0.5 moles of KCl, since the concentration is 0.5 M.
To convert this amount in moles to grams, you will need to use the molecular weight of KCl, which is given as 74.5 g/mol. By multiplying the number of moles by the molecular weight, you get the grams of the solute:
0.5 moles × 74.5 g/mol = 37.25 grams of KCl
Therefore, in a 1-liter solution of 0.5 M KCl, you would have 37.25 grams of KCl.
The critical pressure of carbon dioxide is 72.7 atm what is this value in units of pascals
Answer:
7366.328 kPa.
Explanation:
The critical pressure of carbon dioxide is 72.7 atm.To convert from atm to kPa, we use the relation that:1.0 atm = 101.325 kPa.
Applying conversion factor:
The conversion factor = (101.325 kPa/1.0 atm)
∴ The critical pressure of carbon dioxide (in kPa) = (72.7 atm)(101.325 kPa/1.0 atm) = 7366.328 kPa.
Answer:
= 7366.328 kPa.
Explanation:
(72.7 atm)(101.325 kPa/1.0 atm)
= 7366.328 kPa.
3.00 moles of helium gas (He) are in a container with a volume is 2.00 liters and a temperature is at 298 K. What is the approximate pressure in kilopascals?
Answer:
3718.628 kPa.
Explanation:
We can use the general law of ideal gas: PV = nRT.where, P is the pressure of the gas in atm (P = ??? atm).
V is the volume of the gas in L (V = 2.0 L).
n is the no. of moles of the gas in mol (n = 3.0 mol).
R is the general gas constant (R = 0.0821 L.atm/mol.K),
T is the temperature of the gas in K (T = 298.0 K).
∴ P = nRT/V = (3.0 mol)(0.0821 L.atm/mol.K)(298.0 K)/(2.0 L) = 36.7 atm.
To convert from atm to kPa:
∵ 1.0 atm = 101.325 kPa.
∴ P = (36.7 atm)(101.325 kPa/1.0 atm) = 3718.628 kPa.
14. Which of the following is an example of an epeirogenic process?
O
O A. A rift valley forms at a divergent boundary where two plates are stretched apart.
B. A large plateau forms in the interior of a continental plate when a large section of the plate rises evenly due to an even expansion of the underlying mantle
O C. Mountains form along a convergent plate boundary when two plates collide, causing rock to bunch and buckle upward
O D. Mountains form along a convergent plate boundary when an oceanic plate slips beneath a continental plate, resulting in an upward force on the continental plate
Answer:
A large plateau forms in the interior of a continental plate when a large section of the plate rises evenly due to an even expansion of the underlying mantle. B.
Answer: Option (A) and (D)
Explanation: Epeirogenic process refers to the uplifting and sinking of the continental crust. It is the vertical movement of the crust due to certain mechanisms. Divergent movement of the plates leads to the thinning of the crust and in the convergent plate boundary between a continent and oceanic plate, creates an accretionary wedge that increases the vertical height of the crust. It is not related to the continental collision and plateaus are the stable part of the continent where there is not much change in the thickness of the crust.
Thus the correct answers are (A) and (D)
A compressor takes 0.50 m3 of a gas at 33°C and 760 mmHg and compresses it to 0.10 m3, cooling it to -55°C at the same time. What is the pressure of the gas at these new conditions? 3.7 x 10-4 mmHg 68 mmHg 2,700 mmHg 1.0 mmHg
Answer:
2,700 mmHg.
Explanation:
We can use the general law of ideal gas: PV = nRT.where, P is the pressure of the gas in atm.
V is the volume of the gas in L.
n is the no. of moles of the gas in mol.
R is the general gas constant,
T is the temperature of the gas in K.
If n is constant, and have two different values of V, P and T:P₁V₁T₂ = P₂V₂T₁
P₁ = 760 mmHg, V₁ = 0.50 m³, T₁ = 33°C + 273 = 306.0 K.
P₂ = ??? mmHg, V₂ = 0.10 m³, T₂ = - 55°C + 273 = 218.0 K.
∴ P₂ = P₁V₁T₂/V₂T₁ = (760 mmHg)(0.50 m³)(218.0 K)/(0.10 m³)(306.0 K) = 2707.0 mmHg ≅ 2,700 mmHg.
Answer:
2,700 mmHg.
Explanation:
As the average kinetic energy increases in a material what other energy also increases
Potential energy thats what i think anyone else got a diffrent answer
Increasing the average kinetic energy of a material's particles raises the temperature, which in turn raises the substance's internal thermal energy.
When the temperature of a material is increased, this results in an increase in the average kinetic energy of the particles composing that material. As the average kinetic energy goes up, the temperature of the substance rises. Consequently, if a substance's temperature is elevated, its internal energy also goes up, which can be observed as an uptick in both the kinetic and potential energies of the particles in the material.
Therefore, when we discuss an increase in kinetic energy, we are generally referring to an increase in thermal energy
Specifically, in the context of a chemical reaction, higher kinetic energy means that the molecules are moving more rapidly, resulting in more frequent and more energetic collisions. Even though an increase in collision frequency does not guarantee a reaction will occur, it does increase the probability that the molecules will bump into each other with the necessary orientation and energy to react. This, in turn, can increase the rate of the reaction.
if .40 L if water is added to the volume of cup 3, what would be the new molarity of a 2 M solution of kool-aid
Answer:
0.7692 M ≅ 0.77 M.
Explanation:
It is known that the no. of millimoles of a solution before dilution is equal to the no. of millimoles of the solution after the dilution.It can be expressed as:(MV) before dilution = (MV) after dilution.
M before dilution = 2.0 M, V before dilution = 0.25 L.
M after dilution = ??? M, V after dilution = 0.25 L + 0.40 L = 0.65 L.
∴ M after dilution = (MV) before dilution/(V) after dilution = (2.0 M)(0.25 L)/(0.65 L) = 0.7692 M ≅ 0.77 M.
Which of the following is used in pencils?
A. Graphite
B. Silicon
C. Charcoal
D. Phosphorous
Which of the following metals forms an amalgam with other metals?
A. Tin
B. Mercury
C. Lead
D. Zinc
Answer:
1st answer: A. Graphite
2nd answer: B. Mercury
Explanation:
a lithium atom has three electrons.A fluorine has 9 protons and 9 electrons,with 7 electrons in its outer energy level.Using a diagram,explain how an atom of lithium an an atom of fluorine combine by ionic bonding
The lithium atom provides the fluorine atom with one electron making both atoms stable. Fluorine has a better positive charge than lithium so fluorine will attract the electron. Now, the atoms fuse together to form an ionic bond and making lithium fluoride. Ionic bonds are caused by the attraction between two forces of atoms.
Answer:
The lithium atom has one electron in its outer shell, so it loses that one electron and becomes a [tex]Li^{1+}[/tex] ion. The fluorine atom has 7 electrons in its outer shell so it gains that one electron and becomes a [tex]F^{1-}[/tex] ion. The electrostatic force of attraction between the two ions, because of their charges, bonds them together in an ionic bond to make [tex]LiF[/tex], Lithium Fluoride.
Couldn't add a diagram, but hope it helps.
WORTH 99 POINTS
What are the negative effects of deforestation on the environment? Check all that apply.
air pollution
desertification
water pollution
urbanization
climate change
desertification, urbanization, and climate change(more carbon dioxide).
Answer:
Desertification and climate change and urbanization
2. A solution is made by adding 1.23 mol of KCl to 1000.0 g of water. Assume that the
density of water (and the resulting solution) is 1.00 g/mL.
a. Calculate the formula weight of KCl.
b. Calculate the mass of KCl in grams.
c. Calculate the percent by mass of KCl in this solution.
d. Calculate the molarity of the solution.
Answer:
a. 74.55 g/mol.
b. 91.70 g.
c. 8.40%.
d. 1.23 mol/L.
Explanation:
a. Calculate the formula weight of KCl.
∵ Formula weight of KCl = atomic weight of K + atomic weight of Cl
atomic weight of K = 39.098 g/mol, atomic weight of Cl = 35.45 g/mol.
∴ Formula weight of KCl = atomic weight of K + atomic weight of Cl = 39.098 g/mol + 35.45 g/mol = 74.548 g/mol ≅ 74.55 g/mol.
b. Calculate the mass of KCl in grams.
we can use the relation:no. of moles (n) = mass/molar mass.
∴ mass of KCl = n*molar mass = (1.23 mol)*(74.55 g/mol) = 91.69 g ≅ 91.70 g.
c. Calculate the percent by mass of KCl in this solution.
The mass % of KCl = (mass of KCl/mass of the solution) * 100.
mass of KCl = 91.70 g,
mass of the solution = 1000.0 g of water + 91.70 g of KCl = 1091.70 g.
∴ The mass % of KCl = (91.70 g/1091.70 g)*100 = 8.399% ≅ 8.40%.
d. Calculate the molarity of the solution.
Molarity is the no. of moles of solute per 1.0 L of the solution.
M = (no. of moles of KCl)/(Volume of the solution (L))
no. of moles of KCl = 1.23 mol,
Volume of the solution = mass of water / density of water = (1000.0 g)/(1.00 g/mL) = 1000.0 mL = 1.0 L.
M = (1.23 mol)/(1.0 L) = 1.23 mol/L.
a. The formula weight of KCl is 74.55 g/mol. b. The mass of KCl in grams is 91.39 g. c. The percent by mass of KCl in the solution is 9.14%. d. The molarity of the solution is 1.23 M.
Explanation:a. The formula weight of KCl (potassium chloride) can be calculated by summing the atomic masses of potassium (K) and chlorine (Cl). The atomic mass of K is 39.10 g/mol and the atomic mass of Cl is 35.45 g/mol. Therefore, the formula weight of KCl is 39.10 g/mol + 35.45 g/mol = 74.55 g/mol.
b. To calculate the mass of KCl in the solution, we need to convert the given amount of KCl in moles to grams. Since 1 mole of KCl has a mass of 74.55 g (as calculated in part a), 1.23 mol of KCl will have a mass of 1.23 mol x 74.55 g/mol = 91.39 g.
c. The percent by mass of KCl in the solution can be calculated by dividing the mass of KCl (91.39 g, as calculated in part b) by the mass of the solution and multiplying by 100%. The mass of the solution is given as 1000.0 g. Therefore, the percent by mass of KCl in the solution is (91.39 g / 1000.0 g) x 100% = 9.14%.
d. The molarity of the solution can be calculated by dividing the number of moles of KCl by the volume of the solution in liters. The number of moles of KCl is given as 1.23 mol and the volume of the solution is 1000.0 g of water, which is equivalent to 1000.0 mL or 1.0000 L. Therefore, the molarity of the solution is 1.23 mol / 1.0000 L = 1.23 M.
When magnesium chloride reacts with water, 5.85)L HCLg is produced. How many moles of HCL is produced
Answer: 650 moles
Explanation: so converted in grams just to make it easy for me, its 5850 g of water right, which is 325 moles of water
so here's the balanced equation
MgCl2 + H20 ==> 2HCl + MgO
thus 1 mole of h20 gives us 2 moles of hcl, so 325 x 2 = 650 moles of hcl
a gas at pressure 4.4 atm and 32.14 L has a new volume of 72 L, what is the new pressure
Answer:
[tex]\boxed{\text{2.0 atm}}[/tex]
Explanation:
If the temperature is constant, the only variables are pressure and volume, so we can use Boyle’s Law.
p₁V₁ = p₂V₂
Data:
p₁ = 4.4 atm; V₁ = 32.14 L
p₂ = ?; V₂ = 72 L
Calculation:
4.4 × 32.14 = p₂ × 72
141 = 72p₂
[tex]p_{2} = \dfrac{141}{72} = \textbf{2.0 atm}[/tex]
The new pressure is [tex]\boxed{\textbf{2.0 atm}}[/tex]
Which one of these is a gas
NaNo3
KL
KCL
NH3
Answer:
nano3 is a solid so its not that one it has to be NH3
Explanation:
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Final answer:
The substance among the given options that is a gas is NH3 or ammonia, as indicated by (g) for gaseous state in the provided reference list.
Explanation:
Among the substances listed — NaNO3, KL, KCL, and NH3 — the one that is a gas is NH3, also known as ammonia. From the reference information provided, NH3 is indicated as NH3(g), where (g) denotes that it is in the gaseous state at standard temperature and pressure. The other substances NaNO3, KL (which seems to be a typo and should likely be KI), and KCL (KCl) are solids as indicated by the (s) in the reference list provided.
NH3 is a common gas known for its pungent odor and is used in various applications, including household cleaning products and fertilizers.
a mixture of ozone and oxyen containing 20% by volume of ozone defuse through a porous in172 sec while same volume of pure oxygen took 164 sec to diffuse . calculate relative density of ozone
The relative density of ozone will be 1.5
How many miles of beryllium chloride BeCl2 are needed to make 130 ml of a 0.025 M solution
Answer:
= 0.00325 moles of beryllium
Explanation:
Molarity or concentration is given by the formula;
Molarity = Number of moles/Volume in L
Therefore, to get the number of moles
Moles = Molarity × Volume
= 0.025 M × 0.13 L
= 0.00325 moles of beryllium
what is the concentration of an NaOH solution that requires 50 mL of a 1.25 M H2SO4 solution to neutralize 78.0 ml of NaOH
Answer:
The answer is the concentration of an NaOH = 1.6 MExplanation:
The most common way to solve this kind of problem is to use the formula
C₁ * V₁ = C₂ * V₂In your problem,
For NaOH
C₁ =?? v₁= 78.0 mL = 0.078 L
For H₂SO₄
C₁ =1.25 M v₁= 50.0 mL = 0.05 L
but you must note that for the reaction of NaOH with H₂SO₄
2 mol of NaOH raect with 1 mol H₂SO₄
So, by applying in above formula
C₁ * V₁ = 2 * C₂ * V₂ (C₁ * 0.078 L) = (2* 1.25 M * 0.05 L)C₁ = (2* 1.25 M * 0.05 L) / (0.078 L) = 1.6 MSo, the answer is the concentration of an NaOH = 1.6 M
Bromine can be classified as a
Answer:
Halogen / salt-former
Explanation:
Bromine is classified as an element in the 'Halogens' section which can be located in group 7 of the Periodic Table. The term "halogen" means "salt-former" and compounds containing halogens are called "salts".
What happens to pressure as volume increases
If the volume increases then the pressure would decrease.
Answer: So if the volume increases, the pressure decreases. ... Boyle's law states that for a fixed amount of gas in an enclosed system at constant temperature, pressure and volume are inversely proportional
Explanation:
This linear relationship between pressure and volume means doubling the volume of a given mass of gas decreases its pressure by half.
PV = c
or
P ∝ 1/V
To ensure that the air in the shuttle remains free of excess CO2, engineers test the air-purification system. they combine 1.000 × 103 g LiOH with 8.80 × 1 02 g CO2. The reaction produces 3.25 × 102 g H2O. What is the limiting reactants in this test reaction? What is the theoretical yield of this test reaction?
The
balanced reaction is:
2LiOH + CO2 = Li2CO3 + H2O
We
are given the amount of the reactants to be reacted. This will be the starting point of our
calculations. To determine the limiting reactant, we convert the amounts from grams to moles.
1.000 × 10^3 g LiOH (1 mol / 25.95 g) = 38.54 mol LiOH
8.80 × 10^2 g CO2 ( 1mol / 44.01 g) = 20.00 mol CO2
From the balanced reaction, the molar ratio of the reactants is 2:1. This means that every two mole of lithium hydroxide, 1 mole of carbon dioxide is needed. It is clear that, from the given amounts, CO2 is the limiting reactant.
Answer: The limiting reagent is carbon dioxide and theoretical yield of the reaction is 360 g.
Explanation:
To calculate the number of moles, we use the equation:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex] .....(1)
For LiOH:Given mass of LiOH = [tex]1.00\times 10^3g[/tex]
Molar mass of LiOH = 23.95 g/mol
Putting values in equation 1, we get:
[tex]\text{Moles of LiOH}=\frac{1.00\times 10^3g}{23.95g/mol}=41.75mol[/tex]
For carbon dioxide:Given mass of carbon dioxide = [tex]8.8\times 10^2g[/tex]
Molar mass of carbon dioxide = 44 g/mol
Putting values in equation 1, we get:
[tex]\text{Moles of carbon dioxide}=\frac{8.8\times 10^2g}{44g/mol}=20mol[/tex]
The chemical equation for the reaction of lithium hydroxide and carbon dioxide gas follows:[tex]2LiOH(s)+CO_2(g)\rightarrow Li_2CO_3(s)+H_2O(l)[/tex]
By Stoichiometry of the reaction:
1 moles of carbon dioxide reacts with 2 moles of lithium hydroxide.
So, 20 moles of carbon dioxide will react with = [tex]\frac{2}{1}\times 20=40mol[/tex] of lithium hydroxide.
As, given amount of lithium hydroxide is more than the required amount. So, it is considered as an excess reagent.
Thus, carbon dioxide is considered as a limiting reagent because it limits the formation of product.
By Stoichiometry of the reaction:
1 mole of carbon dioxide produces 1 mole of water
So, 20 moles of carbon dioxide will produce = [tex]\frac{1}{1}\times 20=20moles[/tex] of water
Now, calculating the theoretical yield of water from equation 1, we get:Molar mass of water = 18 g/mol
Moles of water = 20 moles
Putting values in equation 1, we get:
[tex]20mol=\frac{\text{Mass of water}}{18g/mol}\\\\\text{Mass of water}=360g[/tex]
Hence, the limiting reagent is carbon dioxide and theoretical yield of the reaction is 360 g.
Select the correct answer. Which of the following tests could be safely used to distinguish a strong base from a weak base? A. taste B. touch C. litmus paper D. electrical conductivity
Answer: Option (D) is the correct answer.
Explanation:
Bases are the substances that release hydroxide ions when dissolved in water.
A strong base will dissociate completely in water and give more number of hydroxide ions [tex](OH^{-})[/tex]. Whereas a weak base will slightly dissolve to give hydroxide ions [tex](OH^{-})[/tex] in water.
So, a strong base will have high electrical conductivity and a weak base will have low electrical conductivity.
Since, both are bases (strong base and weak base) therefore, both of them will have bitter taste, slippery texture and they will turn red litmus into blue.
Hence, we can conclude that electrical conductivity tests could be safely used to distinguish a strong base from a weak base.
Litmus paper tests could be safely used to distinguish a strong base from a weak base. The correct answer is C.
To distinguish a strong base from a weak base, one can use litmus paper as a safe and effective method. Litmus paper is a pH indicator that changes color in response to the acidity or basicity of a solution.
When a strong base, such as sodium hydroxide (NaOH), comes into contact with litmus paper, it will cause a dramatic color change, typically from red to blue in the case of blue litmus paper.
This is because strong bases have a high concentration of hydroxide ions (OH-) and can rapidly accept protons (H+), leading to a significant increase in pH.
On the other hand, a weak base, such as ammonia (NH3), will also cause a color change but to a lesser extent or more slowly, reflecting its lower ability to accept protons compared to a strong base.
The pH change will be less dramatic, and the color change on the litmus paper may be less pronounced or take longer to occur.
The other options are not suitable for distinguishing between strong and weak bases:
A. Taste -
Tasting chemicals is extremely dangerous and should never be done. It does not provide a safe method to distinguish between strong and weak bases.
B. Touch -
While some bases may feel slippery or soapy to the touch due to the formation of soap-like substances when they react with oils on the skin, this method is not safe and does not provide a clear distinction between strong and weak bases.
D. Electrical conductivity -
Both strong and weak bases can conduct electricity if they are ionic and dissociate into ions in solution. Therefore, electrical conductivity cannot be used to distinguish between the strength of bases.
In summary, litmus paper is the safest and most reliable method among the options provided to distinguish a strong base from a weak base based on the degree of color change and the speed of the reaction.
Practice Explaining Heat Flow
Examine the image showing a pan of boiling
eggs on a gas burner. What is the path of heat
flow?
a) hot gas - pan -> eggs - water
b) pan ->hot gas - eggs > Water
c) burning gas - pan -* water - eggs
d) eggs — water - burner - pan
e) pan - water - eggs - burner
Dona
Answer:
The right choice is "burning gas → pan → water → eggs"
Explanation:
Heat will flow from the body of higher temperature to the cooler body.
So, heat will firstly flow from burning gas to pan by conduction then to the water in contact with pan then to the egg present inside the water.
So, the right choice is :
"burning gas → pan → water → eggs"
Answer: Option (c) is the correct answer.
Explanation:
When two objects of different temperature come in contact with each other then heat will flow from hot object to cold object. This process of transfer of heat is known as conduction.
For example, a pan of boiling eggs on a gas burner will have transfer of heat from gas burner to the pan and then heat will flow from water to the eggs.
This process is also a conduction process.
Thus, we can conclude that the path of heat flow will be as follows.
[tex]\text{burning gas} \rightarrow \text{pan} \rightarrow \text{water} \rightarrow \text{eggs}[/tex]