Answer:
B) 87g
Explanation:
Usatestprep said it
Final answer:
To prepare 0.50 L of a 1.0 M solution of potassium sulfate, 87 g of the solute is needed. So the correct option is B.
Explanation:
To prepare a 0.50 L of a 1.0 M solution of potassium sulfate (K₂SO₄), first, we need to calculate the number of moles of the solute needed using the molarity equation, M = moles/L. For a 1.0 M solution, we need 1.0 mole of K₂SO₄ per liter. However, since we're preparing only 0.50 L, we need 0.50 moles of K₂SO₄.
Molar mass of K2SO4 = 2(K) + S + 4(O) = 2(39.10) + 32.07 + 4(16.00) = 174.27 g/mol.
Mass of K2SO4 needed = moles × molar mass = 0.50 moles × 174.27 g/mol = 87.135 g.
Using the correct significant figures, the mass of the solute needed is 87 g, which corresponds to option B.
In the following reaction, H3PO4 (aq) + H2O (l) ⇄ H2PO4– (aq) + H3O+ (aq) what happens when more H2PO4– (aq) is added to the solution?
Answer:
The concentration of H₃PO₄ will increase.
Explanation:
H₃PO₄(aq) + H₂O(l) ⇄ H₂PO₄⁻(aq) + H₃O⁺(aq)
According to Le Châtelier's Principle, when we apply a stress to a system at equilibrium, the system will respond in a way that tends to relieve the stress.
If we add more H₂PO₄⁻, the position of equilibrium will move to the left to get rid of the added H₂PO₄⁻.
The concentration of H₃PO₄ will increase.
5.22x10-3 = [? ]x 10-2
Answer:490
Explanation: 5.22x10-3= 49.2 49.2x10-2=490
In water, compounds that releases __________ ions are known as _________
Answer:
hydrogen,Acids
Explanation:
Hope this helps you
Table salt is a compound or element ? explain
Answer:
Table Salt (NaCl) is a chemical compound formed from Sodium and Chlorine. A Chemical Element is any substance containing only one atomic number and can be used together to form Compounds. ... Salt is considered a chemical compound because it is a stable structure formed of two chemical elements.
Explanation:
A 1300 mL sample of gas with a molar mass of 71.0 g/mol at STP has what density?
Answer:
0.055g/mL
Explanation:
Data obtained from the question include:
Molar Mass of the gass sample = 71g/mol
Volume of the gas sample = 1300 mL
Density =?
The density of a substance is simply mass per unit volume. It is represented mathematically as:
Density = Mass /volume.
With the above equation, we can easily obtain the density of sample of gas as illustrated below:
Density = 71g / 1300 mL
Density = 0.055g/mL
Therefore, the density of the gas sample is 0.055g/mL
What is the molar solubility of zinc oxalate ( ZnC204) in water? The solubility-
product constant for ZnC04 is 2.7 x 10-8 at 25°C.
O
1.4 x 10-8
O 7.57
5.4 x 10-8
1.6 x 10-4
2.3 x 10-4
Question 12.11 noint)
Answer:
S = 1.6 E-4 M
Explanation:
ZnCO4 ↔ Zn2+ + CO42-S S S
∴ Ksp = 2.7 E-8 = [Zn2+]*[CO42-]
⇒ Ksp = (S)*(S) = S² = 2.7 E-8
⇒ S² = 2.7 E-8
⇒ S = √2.7 E-8
⇒ S = 1.6432 E-4 M ≅ 1.6 E-4 M
Identify the main purpose of the Periodic Table. *
The periodic table is one of the most important tools in the history of chemistry. It describes the atomic properties of every known chemical element in a concise format, including the atomic number, atomic mass and relationships between the elements. Elements with similar chemical properties are arranged in columns in the periodic table.
The table thus is a quick reference as to what elements may behave the same chemically or which may have similar weights or atomic structures.
Hope this answer helps you
These equations represent the results of dissolving different substances in water. For each dissolution,
the results of a conductivity test are given. The conductivity test involves placing wires connected to a
battery and a light bulb into the solution. If the solution is able to conduct electricity, the bulb will light.
Identify each substance as a strong electrolyte, weak electrolyte, or nonelectrolyte.
(NH4)2SO4(s) → 2NH4+ (aq) + S04 (aq)
light bulb glows brightly:
CuSO4(s) → Cu2+(aq) + SO42-(aq)
light bulb glows brightly:
HF(g) + H2O(1) → H30+ (aq) + F→ (aq)
light bulb glows faintly:
C3H6O(1) → C3H60(aq)
light bulb does not glow:
Answer:
Strong electrolyte
Strong electrolyte
Weak electrolyte
Non electrolyte
Considering the equations, the nature of the electrolyte in each case is as follows;
1) Strong electrolyte
2) Strong electrolyte
3) Weak electrolyte
4) Non electrolyte
What is an electrolyte?An electrolyte is a solution that is able to conduct electricity because of the presence of ions in the solution.
We shall now identify whether or not each solution is a strong electrolyte/ weak electrolyte or non electrolyte;
1) Strong electrolyte
2) Strong electrolyte
3) Weak electrolyte
4) Non electrolyte
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Help with this please
Answer:
the generator
Explanation:
Which type of bond shows two or more atoms sharing electrons?
Metallic
Covalent
Tonic
Equal
Need ASAP!
Answer:
Covalent is the type of bond.
Answer:
Covalent
Explanation:
Took the test and got it right :)
The process of hydrogen bonding involves hydrogen atoms bonding with blank
A. Either oxygen, carbon, or silicon
B. Either nitrogen, Boron, or hydrogen
C. Either fluorine, oxygen, it nitrogen
D. Either fluorine, hydrogen, or sodium
A student synthesized a cobalt amine complex with 11.0323 g of CoCl2·6H2O (limiting reactant, MW = 237.83 g/mol) and collected 9.4705 g of the cobalt amine complex (MW = 250.45 g/mol). What was the percent yield?
Answer:
The percent yield would be 81.51%
Explanation:
Number of moles of CoCl2·6H2O would be calculated by using the formula
number of moles = given weight/molecular weight.
Thus, by putting values,
= 11.0323/237.83
= 0.046387
Number of moles of CO+2 = Number of moles of CoCl2·6H2O = 0.046387
As we know that CoCl2·6H2O is a limiting reactant, therefore, the number of moles of complex = Number of moles of CO+2 = 0.046387.
Hence, we can calculate the mass of the complex as follows:
Molecular weigth x number of moles = 250.45 x 0.046387
Thus, the theoratical yield would be 11.6176.
We know that actual yield as given in statement is 9.4705 g. Therefore, percent yield would be,
= (9.4705 / 11.6176) x 100
= 81.51%
At 17.0 degrees Celsius, a 0.800 mole sample of a gas exerts a pressure of 1.20 atmospheres.
What is the volume of the container? *
Answer:
The volume in the container is 15.86 L
Explanation:
Step 1: Data given
Temperature = 17.0 °C = 290 K
Number of moles = 0.800 moles
Pressure = 1.20 atm
Step 2: Calculate the volume of the container
p*V = n*R*T
⇒with p = the pressure of the gas = 1.20 atm
⇒with V of the container = TO BE DETERMINED
⇒with n = the number of moles = 0.800 moles
⇒with R = the gas constant = 0.08206 L*Atm/mol*K
⇒with T = the temperatur = 17.0 °C = 290 K
V = (n*R*T)/p
V = (0.800 moles * 0.08206L*atm/mol*K * 290 K) / 1.20 atm
V = 15.86 L
The volume in the container is 15.86 L
This chemical reaction is unbalanced: ___Pb(NO₃)₂(aq) + ___Li₂SO₄(aq) → ____PbSO₄(s) + ____LiNO₃(aq) Which coefficient should appear in front of LiNO₃ in the balanced equation?
1
2
3
4
Answer: 2
Explanation:
The coefficient that should appear in front of LiNO₃ in the balanced equation is 2, to ensure that the number of nitrate ions is conserved between the reactants and the products.
The unbalanced chemical reaction provided is Pb(NO₃)₂ (aq) + Li₂SO₄ (aq) →PbSO₄ (s) + LiNO₃ (aq).. To balance this equation, we must ensure that the number of each type of atom or polyatomic ion on the reactant side equals the number on the product side.
Let's start by looking at the lead (Pb) atoms. There is one Pb atom on the reactant side and also one on the product side, so Pb is balanced. Next, we notice that there are two nitrate (NO₃) ions on the reactant side within the Pb(NO₃)₂ compound. On the product side, each LiNO₃ contains one nitrate ion, so we need two LiNO₃ molecules to balance the nitrate ions. So, the coefficient in front of LiNO₃ should be 2.
Therefore, the balanced equation would be Pb(NO₃)₂ (aq) + Li₂SO₄ (aq) →PbSO₄ (s) + 2 LiNO₃ (aq).
The diagram below shows the movement of particles. What does this piece of evidence best support? The collision theory The Maxwell-Boltzmann distribution. The effect of pressure on reaction rates. The effect of temperature on reaction rates
The diagram below shows the movement of particles. This piece of evidence is best supported by :
the collision theory
Explanation:
Collision theory states that when suitable particles of the reactant hit each other, only a certain fraction of the collisions cause any noticeable or significant chemical change; these successful changes are called successful collisionsCollision theory, theory used to predict the rates of chemical reactions, particularly for gases. The collision theory is based on the assumption that for a reaction to occur it is necessary for the reacting species (atoms or molecules) to come together or collide with one another.Collision theory is how scientists make predictions about how fast chemical reactions take place. Chemical reactions occur when particles are oriented correctly and collide with enough energy to break bonds.Collision theory states that the rate of a chemical reaction is proportional to the number of collisions between reactant molecules. The more often reactant molecules collide, the more often they react with one another, and the faster the reaction rate.
Answer: a
Explanation:
edge
Which statement accurately compares ionic and covalent bonding?
Answer:
Ionic have high melting and boiling points while covalent has low melting and boiling points.
Compound with ionic bonding have high melting points as compared to the compounds with covalent bonding.
What is ionic bonding?
Ionic bonding or electrovalent bonding is a type of bonding which is formed between two elements when there is an exchange of electrons which takes place between the atoms resulting in the formation of ions.
When the atom looses an electron it develops a positive charge and forms an ion called the cation while the other atom gains the electron and develops a negative charge and forms an ion called the anion.
As the two atoms are oppositely charged they attract each other which results in the formation of a bonding called the ionic bonding.The compounds with ionic bonding have high melting points ,high density and are malleable and ductile as well.
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If a liter of solution is needed, how many grams of ethanol, C2H6O will be added when a scientist creates a 0.25 molal solution?
Answer:
11.52g of ethanol
Explanation:
Molality is an unit of concentration defined as ratio between moles of solute (In this case, ethanol) and kg of solvent.
As solvent is water, 1 liter of water weights 1kg.
That means to create a 0.25molal solution it is necessary to have 0.25 moles of ethanol.
Molar weight of ethanol (C₂H₆O) is:
C: 12.01g/mol × 2 = 24.02g/mol
H: 1.01g/mol × 6 = 6.06g/mol
O: 16g/mol × 1 = 16g/mol
24.02g/mol + 6.06g/mol + 16g/mol = 46.08g/mol
As you need 0.25 moles, there is necessary to weight:
0.25 moles × (46.08g/mol) = 11.52g of ethanol
How does changing the temperature affect the chemical reaction?
A) Solubility of the solutes and the reaction rate are increased as the temperature of the reaction is decreased.
B) Lowering the temperature of the chemical reaction increases the concentration of the solute and the reaction rate.
C) Raising the temperature of the reaction increases the reaction rate by increasing the energy and frequency of collisions.
D) Concentration of the solute and pressure of the solution decreases as the temperature of the chemical reaction increases.
Answer:
C
Explanation:
Temperature is directly related to kinetic energy (KE). As we raise temperature, we are raising KE, as well. Particles with more KE move more quickly and with more force.
This means that these particles are more likely to collide with each other and react to allow the chemical reaction to follow through. In turn, if the chemical reaction is more likely to go to completion, the reaction rate increases, eliminating A and B.
The concentration of the solute is not affected by the temperature; in other words, temperature will not increase or decrease the amount of solute in the solution, so eliminate D.
Thus the answer is C.
Hope this helps!
Final answer:
Raising the temperature of a chemical reaction generally increases the rate of reaction due to faster molecular movement, more collisions, and higher chances of overcoming the activation energy barrier. However, the solubility of gases in a solvent typically decreases with increased temperature.
Explanation:
Changing the temperature can significantly influence the rate of a chemical reaction. When you raise the temperature of a chemical reaction, you provide more kinetic energy to the reactants. This increased energy results in the molecules moving faster, leading to a higher frequency of collisions. More importantly, these collisions are more forceful, making it more likely for the reactants to overcome the activation energy barrier and form products. As such, the reaction rate increases with an increase in temperature.
It is important to note, however, that the effect of temperature on solubility can vary depending on the nature of the solute. For example, the solubility of gases such as HCl, NH₃, and SO₂ in a solvent actually decreases with an increase in temperature. This is because a higher temperature gives the gaseous solute molecules more kinetic energy, increasing their tendency to escape the solvent and return to the gas phase.
In summary, among the given options, C) accurately describes the effect of temperature on chemical reactions: Raising the temperature of the reaction increases the reaction rate by increasing the energy and frequency of collisions.
The population of the Earth at the end of 2018 was approximately 7.7 × 10 9 people. Which of the following is the correct way of representing this number?
Answer:
7700000000
Explanation:
so 7.7 x 10 to the power of 9 is in standard form
to put it into a number you just need to times it by 1000000000
however your answer will only have 8 zeros because of the decimal point
The Lewis dot model of a molecule is shown
Answer:
b. Each chlorine has three non-bonded pairs and one bonded pair of electrons.
Explanation:
Chlorine has three valance electrons. Each Cl atom forms a single covalent bond with the central P atom by sharing a pair of electrons. After forming a single covalent bond each Cl atom is left with six electrons that do not participate in any bond formation or there are three pairs of lone electrons.
Hope this helps :)
Answer:
Each chlorine has three non-bonded pairs and one bonded pair of electrons.
Explanation:
0710
A missile is flying at a speed of 125 m/s. If the missile has a
mass of 125 kg, what's its kinetic energy? Keep 4 significant
figures.
Answer:976,600
Explanation:
I had the exact same question and I got it right.
Answer:
976,563
Explanation:
this is the true answer
Select the reasons why organisms are classified. Check all that apply.
to name them
to determine their lifespan
to form groups
to allow identification
to show relatedness
to identify their habitats
Answer:
ACDE
Explanation:
just answered this question on edg
Answer: A C D and E
Explanation: I just did it.
Does plateau have low elevation
Answer:
No it does not, plateaus are very elevated
Zn(s) + 2HCl(aq) → ZnCl2(aq) + H2(g)
When combining zinc metal with hydrochloric acid, you notice that you run out of zinc and still have plenty of hydrochloric acid to
continue the reaction. What is the term used to describe the zinc?
Answer:
limiting reactant
Explanation:
The term that will be used to describe zinc in this case is limiting reactant.
A limiting reactant is a reactant that determines the amount of product formed in a chemical reaction. They are often stoichiometrically smaller of all the reactants in a reaction and once they are used up during, the reaction stops.
In this case, the zinc metal in the reaction is completely consumed, making the hydrochloric acid to be in excess. The zinc thus determines the amount of the products formed,
can someone help me create my own chemistry meme with this picture.. ( don’t copy and paste from internet please ) THANKS !
Answer:
When you remember salt is soduim chloride so you put it on everything to feel smart.
Explanation:
Sorry im bad at this : - /
Which of the following correctly represents 148 million kilometers in scientific notation?
Group of answer choices
1.48 × 10 8
1.48 × 10 5
1.48 × 10 7
1.48 × 10 6
How much heat is lost when solid Al with a mass of 4110 g cools from 660.0 oC to 25.0 oC?
(Specific Heat of Al is 0.902 J/g x oC)
The amount of heat lost when solid Al cools from 660.0 oC to 25.0 oC is approximately 2,389,101.17 J.
Explanation:To calculate the heat lost, you can use the heat transfer equation: Q = mcΔT, where Q is the heat lost, m is the mass of the object, c is the specific heat capacity of the substance, and ΔT is the change in temperature. In this case, the mass of aluminum (Al) is given as 4110 g and the specific heat of Al is given as 0.902 J/g x oC.
First, calculate the change in temperature: ΔT = T_final - T_initial = 25.0 oC - 660.0 oC = -635.0 oC.
Next, plug the values into the formula: Q = (4110 g)(0.902 J/g x oC)(-635.0 oC) = -2,389,101.17 J.
Therefore, approximately 2,389,101.17 J of heat is lost when solid Al cools from 660.0 oC to 25.0 oC.
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a scuba diver's tank contains 0.29g of oxygen compressed into volume of 2.3L. What is the pressure in the tank at 9C?
To find the pressure in the scuba diver's tank, you can use the Ideal Gas Law. Convert the provided quantities into appropriate units (g to moles, °C to K, etc), then substitute into the Ideal Gas Law equation to solve for pressure.
Explanation:To calculate the pressure in the scuba diver's tank, it is necessary to apply the Ideal Gas Law, which states PV = nRT. Here, P is pressure, V is volume, n is moles of the gas, R is the ideal gas constant and T is temperature in Kelvin.
First, you need to convert all the given values into compatible units. 0.29 grams of Oxygen need to be converted to moles. We know that the molar mass of Oxygen is about 32 g/moles, hence, 0.29 g is approximately 0.00906 moles. The volume of 2.3L is appropriate as is, and the temperature needs to be converted from Celsius to Kelvin by adding 273.15 to the °C value. Thus, the temperature will be 9 + 273.15 = 282.15 K.
Substituting the found values and the ideal gas constant (which is about 0.0821 L·atm/(K·mol) in this case) in the equation P = nRT / V, we have:
P = (0.00906 moles * 0.0821 L·atm/(K·mol) * 282.15K) / 2.3L
By calculating the above expression, we can get the pressure in the diving tank.
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To find the pressure in the scuba tank, you can use the ideal gas law equation (PV=nRT). Convert the given temperature to Kelvin and the given mass of oxygen to moles. Plug the values into the equation to solve for the pressure, which is approximately 0.110 atm.
Explanation:To find the pressure in the scuba tank, we can use the ideal gas law equation, which is PV = nRT. In this equation, P represents the pressure, V represents the volume, n represents the number of moles, R is the ideal gas constant, and T is the temperature in Kelvin.
We first need to convert the given temperature of 9°C to Kelvin. To do this, we add 273.15 to the Celsius temperature, giving us 9 + 273.15 = 282.15 K.
Next, we convert the given mass of oxygen (0.29g) to moles. Since the molar mass of oxygen (O₂) is 32 g/mol, we divide the mass by the molar mass: 0.29g / 32 g/mol = 0.009 mol.
Now we can plug the values into the ideal gas law equation and solve for the pressure:
PV = nRT
P * 2.3L = 0.009 mol * 0.0821 L·atm/mol·K * 282.15 K
P = (0.009 mol * 0.0821 L·atm/mol·K * 282.15 K) / 2.3L
P ≈ 0.110 atm
Therefore, the pressure in the scuba tank at 9°C is approximately 0.110 atm.
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To make a 4.00 M solution, how many moles of solute will be needed if 12.0 liters of solution are required?
A: 6 mol
B: 12 mol
C: 48 mol
D: 120 mol
Answer:
C
Explanation:
Molarity=number of moles/volume
Hence:
Moles required=Molarity×volume
=4mol/L×12L=48moles
Hint:As L(litre will cancel out))
Answer is C
The required moles of solute will be "48 mol".
Molar solutionAn aqueous solution containing one mole of something like a chemical dissolved throughout one liter of water or liquid is considered a Molar solution.
According to the question,
Molarity = 4 M
Volume = 12 L
We know the formula,
→ Molarity = [tex]\frac{Number \ of \ moles}{Volume}[/tex]
or,
→ Moles required = Molarity × Volume
By substituting the values, we het
= 4 × 12
= 48 moles
Thus the correct answer be "Option C" i.e., 48 mol.
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Identify the spectator ions in this reaction:
H+ + Br - + K+ + OH →K+ + Br + H20
Ht and K+
Br- and OH
Kt and Br
DONE
Answer:
K+ and Br-
Explanation: