Explanation:
A 300-ml of 0.100M HCl solution contains
0.100M HCl = (0.100 mol HCl/L) × (0.300 L)
----> 0.03 mol HCl
So we need to find the volume of 12M HCl solution that contains 0.03 mol HCl
0.03 mol HCL = (12 mol HCl/1 L)×V
or
V = (1 L × 0.03 mol HCl)/(12 mol HCl)
= 0.0025 L
= 2.5 ml
So you need 2.5 ml of 12M HCl to be diluted with distilled water to 300 ml in order to get a 0.100M HCl solution.
1. What is the kinetic energy of a cow that has a mass of 1500 kg and is moving at 4
meters per second?
Answer:
12000j
mass=1500kg
velocity=4m/s
Kinetic Energy (K E) = 1/2 mv^2
=1/2*1500(4^2)
=1*750*16
=12000j
Which of the following statements explains how concentration of a solution affects the rate of a reaction? (5 points)
O a
When concentration decreases, kinetic energy increases.
Ob
When concentration increases, particles collide less often.
When concentration increases, particles collide more often.
Oc
Od
When concentration decreases, collision of particles increases.
Answer:
when concentration increases, particles colide more often
The statement "When concentration increases, particles collide more often" is correct.
What is concentration?A constituent's abundance divided by the entire volume of a combination is known as concentration. Mass concentration, molar concentration, number concentration, and volume concentration are all examples of mathematical descriptions.
There are much more reactant particles travelling together as the concentration of reacting species increases. Because there would be more collisions, the reaction rate will be faster. The rate of a reaction increases as the concentration of reactants increases.
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Please help will give brainliest
Perform the following
mathematical operation, and
report the answer to the correct
number of significant figures.
328 x 0.125 = [?]
Answer: 41.0
Explanation: When you multiply the two numbers you get 41 but you need to have the same amount of significant numbers as the number in the problem with the least significant numbers. I hope this helps
True or False: A higher vapor pressure (evaporates easily) corresponds to strong intermolecular forces.
Which statement best describes thermodynamics?
A. The study of how energy changes and moves
B. The study of physical laws acting on matter
C. The study of electricity at low temperatures
D. The study of intermolecular forces in liquids
Answer:
a
Explanation:
How many moles are in 153 grams of O2?
Answer:
4.78 mol O2
Explanation:
Grams --> moles
Grams/molar mass = moles
153 g O2 / 32 g/mol O2 = 4.78125 (significant figures so round it up; the grams has 3 significant figures, so round it up) 4.78 mol O2
The rate of reaction was measured during a chemical reaction. After the first 3 seconds, the rate of reaction was 1.8 x10−6 M/s. Which of the following would you expect after another 3 seconds?
The question is incomplete, the complete question is;
The rate of reaction was measured during a chemical reaction. After the first 3 seconds, the rate of reaction was 1.8 x10−6 M/s. Which of the following would you expect after another 3 seconds? a
The rate would be higher, and the concentration of reactants would be lower.
b
The rate would be higher, and the concentration of reactants would be higher.
c
The rate would be lower, and the concentration of reactants would be lower.
d
The rate would be lower, and the concentration of reactants would be higher.
Answer:
The rate would be lower, and the concentration of reactants would be lower.
Explanation:
The rate of reaction refers to how quickly or slowly the reactants disappear or the products appear in a given reaction. The rate of reaction depends on the concentration of the reactants. Thus, as concentration decreases with time, the rate of reaction decreases accordingly.
Therefore, reaction rates tend to decrease with time since the concentration of the reactants decrease with time as the reactants are being converted into products. Thus after three seconds, the rate would be lower, and the concentration of reactants would be lower. Hence the answer above.
Answer:
The rate would be lower, and the concentration of reactants would be higher.
Explanation:
I took the test and i think i got it right
How many moles of nitrogen are required to produce 13.5 g of NH 3?
Answer:
number of moles of (N) = 0.794 moles
Explanation:
From the given information:
no of moles of nitrogen (N) = (unknown)???
mass of nitrogen = 13.5 g
molar mass of NH3 = 14 +( 1 × 3) = 17 g/mol
To calculate the no of moles of N, we have:
number of moles of (N) = mass of N/molar mass
number of moles of (N) = 13.5 g/17 g/mol
number of moles of (N) = 0.794 moles
A or B or C or D, plz answer fassttt
Answer:
A.
Explanation:
They'd probably want to know the conditions that usually produce fog
Draw the most stable form of the major product in the reaction. 2 equivalents of an ester react with N a O C 2 H 5, followed by H 3 O plus and C 2 H 5 O H. The ester is a carbonyl bonded to a 3 carbon chain and O C H 2 C H 3.
Answer:
See answer below
Explanation:
This is a Claisen condensation. In the picture below you have the mechanism and final product.
Hope this helps
Select the correct answer.
Using this activity chart, which reaction will happen when a piece of copper is placed in a lead nitrate solution?
A.
2Cu + 3Pb(NO3)2 3Cu(NO3)2 + 2Pb
B.
No reaction occurs.
C.
2Cu + 3Pb(NO3)2 2Cu(NO3)2 + 3Pb
D.
3Cu + 3Pb(NO3)2 3Cu(NO3)2 + 3Pb
E.
The answer cannot be determined from the information given.
Answer:
B, No reaction will occur
Explanation:
Copper as compared to lead is less reactive. This is the reason when lead is added to copper nitrate solution, it replaces the copper and itself combines with nitrate to form lead nitrate aqueous solution
Lead + Copper(II) nitrate → Copper + Lead (II) nitrate
The same is not the case when the reaction is revered i.e Cu is added to Pb NO3 solution.
Hence, option B is correct
What are the components of DNA?
A. ribose sugar, cytosine, guanine, adenine, thymine, and phosphate group
B. ribose sugar, cytosine, guanine, adenine, uracil, and phosphate group
C. deoxyribose sugar, cytosine, guanine, adenine, thymine, and phosphate group
D. deoxyribose sugar, cytosine, guanine, adenine, uracil, and phosphate group
Answer:
C
Explanation:
A-T G-C
Answer:
C
Explanation:
EDGE 2022
please help ME WITH CHEM I DONT HAVE ENOUGH TIME! calculate the number of hydrogen molecules that it would have contained at stp if it had a volume of 200,00m cubed.
We know that, at STP, one mole of a gas occupies 22.4 L of volume
we'll use the same principle to solve this problem
Converting given volume to Liters:
We know that 1 m³ = 1000 L
So, 20000 m³ = (20000)*(1000) L = 2 * 10⁷ L
Converting Liters to moles:
As mentioned above, at STP, one mole occupies 22.4 Liters
Number of moles in 2 * 10⁷ L = 2 * 10⁷ / 22.4
Number of moles = 8.9 * 10⁵ moles
Converting moles to number of particles:
We know that 1 mole contains 6.022 * 10²³ molecules
So, 8.9 * 10⁵ moles contain [(8.9 * 10⁵) * (6.022 * 10²³)] molecules
Number of molecules = 53.6 * 10²⁸ molecules
In proper scientific notation:
Number of molecules = 5.36 * 10²⁹ molecules
A gas has a solubility of 2.45 g/L at a pressure of 0.750 atm. What pressure wold be required to produce an aqueous solution containing 6.25 g/L of this gas at constant temperature
Answer:
1.91 atm
Explanation:
Step 1: Calculate Henry's constant (k)
A gas has a solubility (C) of 2.45 g/L at a pressure (P) of 0.750 atm. These two variables are related to each other through Henry's law.
C = k × P
K = C/P
K = (2.45 g/L)/0.750 atm = 3.27 g/L.atm
Step 2: Calculate the pressure required to produce an aqueous solution containing 6.25 g/L of this gas at constant temperature.
We have C = 6.25 g/L and k = 3.27 g/L.atm. The required pressure is:
C = k × P
P = C/k
P = (6.25 g/L)/(3.27 g/L.atm) = 1.91 atm
Why doesnt the gas on a gas giant escape into space, as it has on mercury?
Answer:
When surface gravity is ore than the escape velocity gases can not escape from the planet.
Explanation:
Mercury is near Sun and the solar wind is also blowing out the atmosphere.
The gas on a gas giant escape into space, as it does on mercury because mercury is closest to sun.
What is a gas giant?A gas giant is defined as a giant planet which is composed mainly of elements of hydrogen and helium. Gas giants are also called failed stars because they contain the same basic elements as a star. Jupiter and Saturn are the gas giants of the Solar System. The term "gas giant" was originally synonymous with "giant planet". However, in the 1990s, it became known that Uranus and Neptune are really a distinct class of giant planets, being composed mainly of heavier volatile substances.For this reason, Uranus and Neptune are now often classified in the separate category of ice giants.
Jupiter and Saturn consist mostly of elements of hydrogen and helium, with heavier elements making up between 3 and 13 percent of their mass. They are thought to consist of an outer layer of compressed molecular hydrogen surrounding a layer of liquid metallic hydrogen, with probably a molten rocky core inside.
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Match the solutions to the descriptions of the freezing points.
a. One mole of the ionic compound Na3PO4 dissolved in 1000 g H2O
b. One mole of the ionic compound CuSO4 dissolved in 1000 g H2O
c. One mole of the nonelectrolyte C6H12O6 dissolved in 1000 g H2O
1. Highest freezing point
2. Intermediate freezing point
3. Lowest freezing point
Answer:
1c
2b
3a
Explanation:
Step 1: Write the general expression to calculate the freezing point depression
The freezing point depression is a colligative property, that can be calculated using the following expression.
ΔT = i × Kc × b
where,
i: van 't Hoff factor (number of ion particles per formula unit)
Kc: cryoscopic constant (Kc for water: 1.86 °C.Kg/mol)
b: molality (moles of solute per kilogram of solvent)
All the solution have the same Kc and the same b (1 mol/1 kg = 1 m), so ΔTf variation will depend on i
Step 2: Calculate the freezing point of the Na₃PO₄ solution
Na₃PO₄ has 4 ions (3 Na⁺ and 1 PO₄³⁻), so i = 4.
ΔT = i × Kc × b = 4 × 1.86 °C.Kg/mol × 1 mol/kg = 7.44 °C
T = 0°C - 7.44 °C = -7.44 °C
Step 3: Calculate the freezing point of the CuSO₄ solution
CuSO₄ has 2 ions (1 Cu²⁺ and 1 SO₄²⁻), so i = 2.
ΔT = i × Kc × b = 2 × 1.86 °C.Kg/mol × 1 mol/kg = 3.72 °C
T = 0°C - 3.72 °C = -3.72 °C
Step 4: Calculate the freezing point of the C₆H₁₂O₆ solution
C₆H₁₂O₆ is a nonelectrolyte (it doesn't ionize), so i = 1
ΔT = i × Kc × b = 1 × 1.86 °C.Kg/mol × 1 mol/kg = 1.86 °C
T = 0°C - 3.72 °C = -1.86 °C
Que uso le darías a la vida diaria escribe en español plis
Explanation:
Facilitar el movimiento y desplazamiento de objetos pesados reduciendo el rose del objeto contra el suelo, Obtener un movimiento circular por efecto de la fuerza de un liquido, en el caso de contadores, molinos, centrales hidroeléctricas y turbinas.
Transmitir el movimiento de un eje a otro como en el caso de las lavadoras, bicicletas y neveras. Reducir drásticamente el esfuerzo necesario para elevar y mover objetos, como en casos de pozos de agua y ascensores Transformar movimientos giratorios en otros movimientos o viceversa. ,
g A chemical equilibrium exists when: A chemical equilibrium exists when: there are equal amounts of reactants and products. the rate at which reactants form products is the same as the rate at which products form reactants. the sum of reactant and product concentrations equals one mole. reactants are completely changed to products. the rate at which reactants form products becomes zero.
Answer:
the rate at which reactants form products is the same as the rate at which products form reactants
Explanation:
There is still a reaction happening just that the second one happens the opposite happens and keeps it at net 0
How is an exothermic reaction indicated in an equation?
[tex] \longrightarrow\sf \pmb {Exothermic \: Reaction}[/tex]
[tex] \tt \green {An \: exothermic \: reaction \: is \: indicated \: by \: writing \: “+Heat” \: or \: “+Heat \: energy” \: or \: “+Energy” \: on \: the \: products \: side \: of \: an \: equation.}[/tex]
Answer: Heat is included as one of the products.
Explanation:
Control rods in nuclear reactors are made of materials that absorb free neutrons in order to
slow down the chain reaction.
True
False
Base your answer on the equation and diagram below represent an electrochemical cell at 298 K and 1 atmosphere.
When the switch is closed, electrons flow from
A) Ag+(aq) to Mg2+(aq)
B) Mg(s) to Ag(s)
C) Ag(s) to Mg(s)
D) Mg2+(aq) to Ag+(aq)
When the switch is closed, electrons flow from the solid magnesium electrode, Mg(s) to solid silver electrode, Ag(s).
Electronegativity of metals
Electronegativity of metals refers to the ability of the atoms of metallic elements to attract electrons from the other metallic elements.
Electronegativity increases down the activity series.
Silver (Ag) will have more tendency to attract electron more than magnesium (Mg).
Thus, when the switch is closed, electrons flow from the solid magnesium electrode, Mg(s) to solid silver electrode, Ag(s).
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i think its D but i not sure so can yall pls help me
Answer:
I'm not really sure but I thinks its
A:veuns
PLZ HELP ON TIMER WILL GIVE BRAINLIEST
How does technology limit the future of space exploration?
There are too many devices in space interfering with taking correct measurements.
Scientists cannot make contact with older satellites in outer space.
Scientists are able to work both with current and future technology.
Scientists must first develop certain technologies before missions can be completed.
Answer:
I would put the final answer choice: "Scientists must first develop certain technologies before missions can be completed"
Explanation:
The first option is partially true, but we have ways around it.
The second option is straight-up false.
The third option doesn't make much sense, how can one work with technology that will be developed in the future and doesn't yet exist?
Therefore, the fourth option is the best.
Hope this helps
-cyber
(NH4)2Cr2O7 Cr2O3 + N2 + H2O
If 4.7369 moles of H2O are produced, how many moles of (NH4)2Cr2O7 were reacted?
Answer:
the original substances in any chemical reaction. products. the resulting substances in any....chromium(III) oxide, and water. (NH4)2Cr2O7(s) → N2(g) + Cr2O3(s) + 4H2O(g).
Help plz:)))I’ll mark u Brainliest
Answer:
82gS
Explanation:
2 Fe + 3 S → Fe2S3
↓ ↑
mol → mol
Fe S
[tex]\frac{95 g Fe }{} \frac{1 mol Fe }{55.85 g Fe } \frac{3 mol S }{2 mol Fe } \frac{32.07 g S}{1 mol S} = 82 g S[/tex]
Potassium hydrogen phthalate is a solid, monoprotic acid frequently used in the laboratory as a primary standard. It has the unwieldy formula of KHC8H4O4. This is often written in shorthand notation as KHP. If 31.0 mL of a barium hydroxide solution are needed to neutralize 1.37 grams of KHP, what is the molarity of the barium hydroxide solution
Answer:
0.1082M of Barium Hydroxide
Explanation:
KHP reacts with Ba(OH)2 as follows:
2KHP + Ba(OH)2 → 2H2O + Ba²⁺ + 2K⁺ + 2P²⁻
Where 2 moles of KHP reacts per mole of barium hydroxide
To solve this question we must find the moles of KHP in 1.37g. With these moles and the reaction we can find the moles of Ba(OH)2 and its molarity using the volume of the solution (31.0mL = 0.0310L) as follows:
Moles KHP -Molar mass: 204.22g/mol-
1.37g * (1mol / 204.22g) = 0.006708 moles KHP
Moles Ba(OH)2:
0.006708 moles KHP * (1mol Ba(OH)2 / 2mol KHP) =
0.003354 moles Ba(OH)2
Molarity:
0.003354 moles Ba(OH)2 / 0.0310L =
0.1082M of Barium HydroxideHow long does it take to fill one train car full of nuclear power can keep a power plant running
In an effort to maintain homeostasis, the organ systems of the human body work to keep the body's internal water level constant. Which of the following statements describe how the human body responds when its internal water level drops too low?
A. The skeletal system produces more circulating blood cells that insecure the body’s water intake
B. The excretory system signals the kidneys to retain more water and produce more concentrated urine to decrease water loss.
C. The nervous system signals the muscles to constrict , holding more water in the digestive track and decreasing water loss .
D.The excretory system signals the kidneys to release more water into the bladder to increase water loss .
PLEASE HELP EMERGENCY ‼️‼️ needed ASAP
Answer:
the photo is kind of blurry i cant really see it, sorry
Explanation:
Calculate the Ka of a 0.35M weak acid with a pH of 4.2.
Answer:
Ka = 1.14x10⁻⁸
Explanation:
First we calculate [H⁺] from the pH:
pH = -log[H⁺][H⁺] = [tex]10^{-pH}[/tex][H⁺] = 6.31x10⁻⁵ MFor a monoprotic weak acid, the molar concentration of H⁺ of a solution can be expressed as:
[H⁺] = √(C*Ka)Where C is the molar concentration of the weak acid solution.
6.31x10⁻⁵ M = [tex]\sqrt{0.35M*Ka}[/tex]1.14x10⁻⁸ = Ka