A student weighs out 51.57 grams of sodium permanganate. The moles of sodium permanganate is 0.363 mol.
What is molar mass?Molar mass of many compounds can be calculated by dividing the mass of the compound by the number of moles of the compound.
The molar mass is given 141.93 g/mol.
To calculate the moles
[tex]\rm Number\;of \;moles= \dfrac{mass}{molar\;mass}\\\rm Number\;of \;moles= \dfrac{51.57}{141.93} = 0.363\;mol[/tex]
Thus, the moles are 0.363 mol.
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Which is it ? U think
Answer:
A
Explanation:
Took the test
most of the volume of an atom is occupied by ?
G. Empty space
Hope this helps!
What is ester?
help me pleaseee
Answer:
an organic compound made by replacing the hydrogen of an acid by an alkyl or other organic group. Many naturally occurring fats and essential oils are esters of fatty acids
Explanation:
ester, any of a class of organic compounds that react with water to produce alcohols and organic or inorganic acids. Esters derived from carboxylic acids are the most common. The term ester was introduced in the first half of the 19th century by German chemist Leopold Gmelin
Name the following branched alkanes. Two of these are isomers of each other, put a star ★ in their boxes.
Answer:
square boxes
✪
Explanation:
if you like my answer
47. Which of the following statements about the
bonds in the reactants and products is most
accurate?
(A) The sum of the bond enthalpies of the bonds
in the reactant is greater than the sum of the
bond enthalpies of the bonds in the
products.
(B) The sum of the bond enthalpies of the bonds
in the reactant is less than the sum of the
bond enthalpies of the bonds in the
products.
(C) The length of the bond between carbon
and oxygen in CH3OH is shorter than the
length of the bond between carbon and
oxygen in CO.
(D) All of the bonds in the reactant and products
are polar.
Answer:
a
Explanation: because the sum of the bond enthalpies of the bond in the reactant is greater than the sum.
Atmospheric pressure on the peak of Kilimanjaro can be as low as 0.20 atm. If the volume of an oxygen tank is 10.0L, at what pressure must the tank be filled so the gas inside would occupy a volume of 1.2 x 1043 L at this pressure?
Answer:
24 atm
Explanation:
From Boyle's Law :
P₁V₁ = P₂V₂Given values :
P₂ = 0.2 atmV₁ = 10.0 LV₂ = 1.2 x 10³ LSolving
P₁ × 10 = 0.2 × 1.2 × 10³P₁ = 0.24 x 10²P₁ = 24 atmNew volume
1.2×10⁴³So apply Boyles law
P1V1=P2V20.2(10)=P2(1.2×10⁴³)20=P2(1.2×10⁴³)P2=1.2×10⁴³/20P2=0.6×10⁴²P2=6×10⁴¹atmwhat is the effect of temperature and pressure on crystal structure ?
ty! :)
Answer:
Increase of pressure increases the coordination number during crystallization e.g. by applying pressure the NaCl type crystal structure having 6:6 coordination number changes to CsCl type crystal having coordination number 8:8.
welc!! you Σ=)
What is the molarity of ions in a 0.339 M solution of MgBr₂ assuming the compound dissociates completely?
Molarity is the molar concentration of the solution with respect to the moles and the volume. The molarity of the magnesium ion will be 0.339 M, and the Bromium ion will be 0.678M.
What is molarity?Molarity is the proportion of the moles of the solute to the volume in liters of the solution present. The compound magnesium bromide completely dissociates as:
MgBr² ⇆ Mg⁺² + 2Br⁻
The molarity of the magnesium ion will be equal to the M of the magnesium bromide and hence, will be 0.339 M.
The molarity of the bromide ions will be equal to two times the M of the magnesium bromide species and hence is 0.678 M.
Therefore, the molarity of the magnesium ion will be 0.339 M, and the Bromium ion will be 0.678M.
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Vanessa made a list comparing the differences between the outer coverings in plants and animals, but she made a mistake. Read the table and then choose the statement that explains why the list is incorrect.
The difference between the outer covering of plants and animals is that plant cell has cellulose cell wall while animal cell is surrounded by a cell membrane
What is a cell?A cell is the structural and functional unit of an organism which is capable of existing alone as it contains organelles that perform specific functions.
The plant cell is covered by a rigid cell wall which contains cellulose as its outer covering.
The animal cell contains not cellulose cell wall at its out covering but instead it is covered by a cell membrane.
Therefore, the difference between the outer covering of plants and animals is that plant cell has cellulose cell wall while animal cell is surrounded by a cell membrane.
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what are three classes of levers? (science)
The three classes of lever include first, second and third class lever.
What are levers?Levers are simple type of machine that are used to transfer the force used to lift a load.
Examples of lever include the following:
First class lever: This is the type of lever where the fulcrum is between the load and the effort.Second class lever: This is the type of lever that has the load between the fulcrum and effort.Third class lever: This is the type of lever that has the effort between the fulcrum and the load.Therefore, the three classes of lever include first, second and third class lever.
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How many grams of chlorine atoms are present in a 3.45 g sample of barium chloride (BaCl2)?
Grams are the unit of measurement of the mass or the weight of the substance. There are 1.17 gms of chlorine atoms in the sample.
What is mass?The mass of the substance is the multiplication of the moles and the molar mass.
Barium chloride dissociates as:
BaCl₂ ⇄ Ba²⁺ + 2 Cl⁻
From the reaction, it can be said that 1 mole of barium chloride dissociates into 1-mole barium ion and 2 moles of chloride ions.
Moles of barium chloride are calculated as:
Moles = mass ÷ molar mass
= 3.45 gm ÷ 208.23 g/mol
= 0.016 moles
If 1 mole of Barium chloride has 2 moles then 0.016 moles of the sample will have, 0.0331 moles of chloride ions.
The mass of chlorine atoms is calculated as:
Mass = moles × molar mass
= 0.0331 × 35.45
= 1.17 gms
Therefore, 1.17 gms of chlorine atoms are present in barium chloride.
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What is an example of a conductor?
A. A glass bowl
B. A wooden spoon
C. A plastic fork
D. A metal knife
Answer: its D.
Explanation: because metal is a conductor hope it helps :>
Clear
What isotope is formed from the beta decay of zirconium-97
о
Niobium -96
Niobium - 97
Zirconium - 96
O Zirconium - 98
Zirconium - 96 isotope is formed from the beta decay of zirconium-97 , Option C is the correct answer .
What are Isotopes ?Atoms are composed of a cloud of electrons surrounding a dense nucleus that is 100,000 times smaller and comprised of protons and neutrons.
The number of protons(i.e., atomic number, "Z") determines the element.
Isotopes are atoms of the same element that have the same number of protons (i.e., atomic number, "Z") but a different number of neutrons, meaning that their mass number, "A", varies.
Naturally occurring zirconium (⁴⁰Zr) is composed of four stable isotopes
One very long-lived radio isotope (⁹⁶Zr), a primordial nuclide that decays via double beta decay with an observed half-life of 2.0×10¹⁹ years
The second most stable radioisotope is ⁹³Zr, which has a half-life of 1.53 million years.
Thirty other radioisotopes have been observed.
All have half-lives less than a day except for ⁹⁵Zr (64.02 days), ⁸⁸Zr (83.4 days), and ⁸⁹Zr (78.41 hours).
The primary decay mode is electron capture for isotopes lighter than ⁹²Zr
and the primary mode for heavier isotopes is beta decay.
Therefore Zirconium - 96 isotope is formed from the beta decay of zirconium-97 , Option C is the correct answer .
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I think that when the temperature decreases, the pressure will __________. When things are cooled,________________..
Answer:
See below ~
Explanation:
From The Ideal Gas Equation,
P ∝ TTherefore,
I think that when the temperature decreases, the pressure will decrease. When things are cooled, pressure decreases.
In an aqueous solution all ions are present. Some of these ions will react, however, some will not. The ions that do not
react in solution are called
a. Inert ions
B. Spectator ions
C. Cations
d. Anions
Answer:
B. Spectator ions
Explanation:
Spectator ions are described as spectators literally because they "spectate", or, in other words, do not participate in the overall reaction. They may show up in the reaction equation, but they don't react themselves.
Thus, spectator ions stay unchanged throughout a reaction. We see many spectator ions in precipitation reactions. Remember that ionic compounds disassociate in solution.
For example, the reaction between silver nitrate [tex]AgNO_{3}[/tex] and sodium chloride [tex]NaCl[/tex] produces a solid precipitate of silver chloride [tex]AgCl[/tex] as represented by the equation below:
[tex]Ag^+_{(aq)} + NO^-_{3(aq)}+Na^+_{(aq)}+Cl^-_{(aq)}[/tex] -------> [tex]AgCl_{(s)}+Na^+_{(aq)}+NO_{3(aq)}^-[/tex]
However, the sodium and nitrate ions remained aqueous, like before, so they did not react. Thus, they are spectator ions.
solubility constant 5
For the dissolving of CaF2, the equilibrium constant expression, Ksp, is
Select one:
O Ksp = [Ca2+] [F]²
Ksp = [Ca2+] [F] / [CaF₂]
O Ksp = [Ca²+] [F]
O
Ksp = [Ca2+] [F]²/[CaF₂]
O
Ksp = [CaF₂] / ([Ca²+] [F] ²)
The Ksp of the compound CaF2 is given as; Ksp = [Ca2+] [F]²
What is solubility product?The term solubility product has to do with the extent to which a substance dissolves in solution.
For the compound CaF2, we have; CaF2(s) ⇆Ca^2+(aq) + 2F^-(aq). Hence, the Ksp of the solution is Ksp = [Ca2+] [F]²
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smoking cigarettes is banned in petrol stations because of the risk of explosions.
Explain why Flames can cause explosions in petrol stations even if they never come into direct contact with any liquid petrol.
help pls!
Answer:
well it is because of mainly what we call reaction the petrol are highly reactive with the flames
How is light used in our daily activities?
Answer:
that is your answer hope this helps u
At 27.0 °C a gas has a pressure of 6.00 atm. What will the pressure be at 150.0 °C?
What type of energy is being used by the roller coaster at each point? 8 9) 10) 11) 8) 9) 10) 11) A) Potential Energy A) Gaining Potential Energy A) Potential Energy A) Gaining Potential Energy B) Kinetic Energy B) Gaining Kinetic Energy B) Kinetic Energy B) Gaining Kinetic Energy
Answer:
Answers are below !
Explanation:
8) A) Potential Energy
9) B) Gaining Kinetic Energy
10) B) Kinetic Energy
11) A) Gaining Potential Energy
if a helium filled ballon has a volume of 3.4l at 25°c and 1.18atm., what is its volume at STP?
Answer:
3.711 L
Explanation:
The formula you need to use is the following:
[tex]\frac{V_{1}}{T_{1}} = \frac{V_{2}}{T_{2}}\\[/tex]
3.4L / 298 K = V2 / 273 K
V2 = 3.711 L
Which of the following matches a human action with its impact?
Construction of bridges : Water pollution
Construction of dams : Decrease in carbon dioxide level
Use of fertilizers : Increase in population of aquatic animals
Decrease in honeybee population : Increase in plant population
Answer:
hi I'm alvin and it's d
Explanation:
brainliest please
Answer:
Use of fertilizers :Increase in population of aquatic animals.
Why is electron configuration important
because it's provide insight into the chemical behaviour of elements by helping determine the valence electrons of an atom
that's my answer
What completely ionizes in solution
Answer:
Strong acids. hope this helps :)
If you had five moles of sodium chloride how many moles of sodium hydroxide could you produce?
-
Solution 1: 0.1 M - Dim Light Solution 2: 0.1M - Bright
Bulb
Which solution from the data table most likely contains a strong acid?
A. Solution 1 is a strong acid due to a large number of dissociated ions.
B. Solution 1 is a strong acid due to a small number of dissociated ions.
C. Solution 2 is a strong acid due to a large number of dissociated ions.
D. Solution 2 is a strong acid due to a small number of dissociated ions.
Answer:
: The conductivity of electrolyte solutions: (a) 0.1 M NaCl (b) 0.05 M NaCl (c) 0.1 M HgCl2. An electrolyte solution conducts electricity because of the movement of ions in the solution (see above). The larger the concentration of ions, the better the solutions conducts. Weak electrolytes, such as HgCl2, conduct badly because they produce few ions when dissolved (low concentration of ions) and exist mainly in the form of molecules.
Explanation:
What is the mole fraction of each component of a gas mixture that contains
sulfur trioxide at a pressure of 1.55 atm and sulfur dioxide at a pressure of
0.35 atm?
Answer:
A model of a shopping centre is drawn to scale where 1 cm on the model represent 4 m on the ground. Music shop Thabo's Sports Ware Fati's Clothing shop Grocery store PARKING Coffee shop Toilets Restaurant Shoe store Physiotherapy Health and Fitness center 1.1 Which shop is on the right of the physiotherapy? (2) 1.2 Describe the position of the Coffee Shop in relation to the Toilets. (2)
Which of the following represents the quantity of heat required to raise the temperature of one gram of a substance by one degree Celsius?
A) Heat of reaction
B) Boiling point
C) Specific heat capacity
D) Thermochemical value
Answer:
C
Explanation:
The units of specific heat are usually calories or joules per gram per Celsius degree. For example, the specific heat of water is 1 calorie (or 4.186 joules) per gram per Celsius degree. The Scottish scientist Joseph Black, in the 18th century, noticed that equal masses of different substances needed different amounts of heat to raise them through the same temperature interval, and, from this observation, he founded the concept of specific heat. In the early 19th century the French physicists Pierre-Louis Dulong and Alexis-Thérèse Petit demonstrated that measurements of specific heats of substances allow calculation of their atomic weights (see Dulong-Petit law). See also heat capacity.
The statement that represents the quantity of heat required to raise the temperature of one gram of a substance by one degree Celsius is Specific heat capacity. The correct option is C.
What is Specific heat capacity?
When the temperature of a material rises 1 K (or 1 °C), the amount of heat (J) is absorbed per unit mass (kg). It is crucial since it will show how much energy will be needed to warm or cool an object of a certain mass by a certain amount.
The formula of specific heat capacity is [tex]Q=mc\Delta T[/tex] Where q is the specific heat, m is the mass and t is the change in temperature.
According to the definition, a material's specific heat capacity is normally calculated by calculating the heat capacity of an illustration of the substance, commonly using a calorimeter, and dividing by the sample's mass.
Thus, the correct option is C. Specific heat capacity.
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Most enzymes work best at 37C because at lower and higher temperatures, the conditions are not optimal for their performance. Explain in DETAIL what happens at low temperatures, optimal temperature and high temperatures with the molecular speed, energy and interactions. Be sure to explain what denaturation means.
That's because the solubility
Temperature is directly proportional to solubilityHigher the solubility higher the temperature
Lower the temperature lower the solubility
So
Less temperature makes enzymes work faster
Drink mix compound what is the formula for drink mix compound
Answer:
Is drinks a compound or mixture?
Drinks are usually solutions of various substances dissolved in the water. Since the amount of each of these can vary (sugar, flavoring, color, carbonation), it’s a mixture. The components can be separated by various physical methods such as evaporation. Is smoke a compound or a mixture? Smoke is a mixture.
