Answer:
B
Explanation:
what is the kc expression of H2(g)+Cl2(g)-2HCL(g)
Answer:The equilibrium constant (kc) for the reaction 2HCl(g) =H2(g)+Cl2 (g) is 4×10^-34 at 25°C.
Explanation:
8x-47+19=24[tex]8x-47+19=24[/tex]
Which of the following statements is correct?
Lithium is a metal, Titanium is a nonmetal
Magnesium and Helium are gases.
Copper and Argon conduct electricity,
Calcium is malleable, Sulfur is not malleable.
Answer:
The 4th statement. Because sulfur is not malleable.
Answer:
d
Explanation:
Mass = 10 g
Density = Mass/volume
Volume of a cube = (side length)3
Now that you have the side length, determine the volume. Then use the density formula to calculate the density of the material. Record your observations by selecting the data table icon.
You may use a calculator for this section.
Measurement1.1 cm
Answer:
If I understood correctly, your answer should be 0.64 grams
Explanation:
If you want to prepare 2.00 L of a 0.800 M NaNO_3 solution from a NaNO_3 stock solution that is 1.5 M in concentration, how many mL of the stock solution must you start with
1066.7 ml of the stock solution must start with, preparing 2.00 L of a 0.800 M NaNO3 solution.
What is volume?Volume is the space occupied by a three-dimensional object.
By the formula [tex]\rm M_1V_1= M_2V_2[/tex]
M1 is the initial molarity, 1.5 M
M2 is the final molarity, 0.800 M
V1 is the initial volume
V2 is the final volume, 2.00 L
Putting the values in the equation
[tex]\rm 1.5\;M \times V_1= 0.800\;M \times 2.00\;L\\\\V_1 = \dfrac{ 0.800\;M \times 2.00\;L}{1.5\;M} = 1066.7\;ml[/tex]
Thus, the initial volume is 1066.7 ml
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If 540.0 mL of nitrogen at 9.00 °C is heated to a temperature of 220.0 °C, what will be the new
volume of the gas?
Answer:
943.82 ml
Explanation:
Assuming constant pressure
V1/T1 = V2/T2
T2 * V1/T1 = V2 ( T must be in K units)
(220 + 273.15) * 540 / (273.15 + 9) = 943.8 ml
How are seeds beneficial to humans or the environment give me a good Reason!!
Answer:Seeds are great sources of fiber. They also contain healthy monounsaturated fats, polyunsaturated fats and many important vitamins, minerals and antioxidants. When consumed as part of a healthy diet, seeds can help reduce blood sugar, cholesterol and blood pressure
Explanation:
Answer:
Seeds grow plants wherever they fall is in the right condition and can be used as a sort of food for humans
Explanation:
What happens when a hydrogen atom is added to a bromothymol blue molecule? (Will give brainliest)
Hydrogen atom is added denotes to something
H+ or H_3O+ is released inside solutionSo the
solution becomes acidicHence.
Bromothymol blue will turn yellow
PLEASE HELP, will give brainliest
Answer:
See below
Explanation:
(NH4)2SO4 Molar weight (from periodic table)
(N =14 H4 = 4 ) * 2 = 36
S = 32 O4 = 64 TOTAL = 132 gm/mole
N % = ( 2*14) / 132 = 21.2% molar mass = 28 gm
H % = (2 *4) / 132 = 6% molar mass = 8 gm
S % = 32/132 = 24.2 % molar mass = 32 gm
O % = (64) / 132 = 48.5% molar mass = 64 gm
what are 3 household substances that contain acids and say why are they useful
Answer:
battery. you use it for your remotes. vinegar. you use vinegar for cooking of cleaning. nail polish remover. you use this for removing nail polish
How many moles of nh3 is needed to react with. 824 mol nh3
1.648 moles of ammonia will be required to produce 0.824 moles of nitrogen gas.
What are moles?Mole is a very important unit of measurement that chemists use. A mole of something means you have 602,214,076,000,000,000,000,000 of that thing, like how having a dozen eggs means you have twelve eggs.
According to the reaction, 1 mole of nitrogen gas is produced by 2 moles of ammonia.
Then, 0.824 moles of nitrogen gas will be produced by:
1.648 moles of ammonia will be required to produce 0.824 moles of nitrogen gas.
Hence, 1.648 moles of ammonia will be required to produce 0.824 moles of nitrogen gas.
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How much 5. 90 m naoh must be added to 480. 0 ml of a buffer that is 0. 0215 m acetic acid and 0. 0275 m sodium acetate to raise the ph to 5. 75?
Buffers are the solution that resists the change in pH. 1.39 ml of 5.90 M sodium hydroxide must be added to raise the pH to 5.75.
What is Henderson–Hasselbalch equation?Henderson–Hasselbalch equation is used to determine the pH of the buffer by the equilibrium concentration of the acid and the conjugate base.
Moles of acetic acid are calculated as:
[tex]0.480 \times 0.0215 = 0.01032[/tex]
Moles of sodium acetate are calculated as:
[tex]0.480 \times 0.0275 = 0.0132[/tex]
The total number of moles is = 0.02352
Now, using the Henderson–Hasselbalch equation:
[tex]\rm pH = \rm pKa + log \dfrac{[Acetate]}{[Acetic\; acid]}[/tex]
Given,
pH = 5.75
pKa = 4.74
Substituting values in the above equation:
[tex]\begin{aligned} 5.75 &= 4.74 +\rm log \rm \dfrac{[Acetate]}{[Acetic\; acid]}\\\\10.2329 &= \rm \dfrac{[Acetate]}{[Acetic\; acid]}\end{aligned}[/tex]
Solving further:
[tex]\begin{aligned} 10.2329 &= 0.02352 - \rm \dfrac{[Acetic\; acid]}{[Acetic\; acid]}\\\\11.2329\; \rm [Acetic \; acid] &= 0.02352 \\\\&= 0.002093\end{aligned}[/tex]
Moles of acetate is calculated as:
0.02352 moles - 0.002093 moles = 0.021427 moles
Initial moles of acetate were 0.0132, added moles of acetate by the addition of the sodium hydroxide resulted in, 0.021427 - 0.0132 = 0.00822 moles of sodium hydroxide.
Volume is calculated as:
[tex]0.00822 \;\rm moles \times \dfrac{1\;\rm L}{5.90\;\rm M} = 0.00139 L[/tex]
Therefore, 1.39 mL of 5.90M of sodium hydroxide is added.
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You need to make an aqueous solution of 0.194 M potassium acetate for an experiment in lab, using a 125 mL volumetric flask. How much solid potassium acetate should you add
To prepare 0.194 M potassium acetate, add 2.379895 g of potassium acetate to a 125 mL volumetric flask and fill with water to the mark.
Define molarity of a solution.Molarity (M) is the amount of a substance in a certain volume of solution. Molarity is defined as the moles of a solute per litres of a solution.
The following data were obtained from the question:
Molarity of potassium acetate = 0.194 M
Volume of solution = 125 mL
Mass of potassium acetate =?
Next, we shall convert 125 mL to L. This can be obtained as follow:
1000 mL = 1 L
Therefore,
125 mL = 0.125 L
Thus, 125 mL is equivalent to 0.125 L.
Next, we shall determine the number of moles of potassium acetate in the solution. This can be obtained as follow:
Molarity of potassium acetate = 0.194 M
Volume of solution = 0.125 L
Moles of potassium acetate =?
Molarity = [tex]\frac{mole}{Volume}[/tex]
Cross multiply
Mole of potassium acetate = 0.194 M × 0.125
Mole of potassium acetate = 0.02425 mole
Finally, we shall determine the mass of potassium acetate
Molar mass of potassium acetate= 98.14 g/mol
Mass of potassium acetate =?
Mole = [tex]\frac{mass}{Molar mass}[/tex]
Mass of potassium acetate =0.02425 × 98.14
Mass of potassium acetate = 2.379895 g
Thus, to prepare 0.194 M potassium acetate, add 2.379895 g of potassium acetate to a 125 mL volumetric flask and fill with water to the mark.
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A balloon with volume of 0.40 liters is at a temperature of 293 K. If the balloon is heated to 523 K, then what will the new volume be?
v=293+523
v=816
this is the answer
thank you
Helpp me plsss I don't understand this
Take the cuttings from the trees and place them around in different enviornements, if the trees grow up to be the expected size in a different eviornement then the the scientists' claim is correct.
I didn't understand at first either, the question is worded a little strangly, but I believe this should answer the question that was asked.
3c reaction time =138.5 sec reation rate=
Answer:
Compute the reaction rate to the nearest whole number using the formula below,
mass of tablet/volume of water
Reaction Rate = mas
reaction time
3°C Reaction time = 138.5 sec
Reaction rate = mg/l/sec
24°C Reaction time = 34,2 sec
Reaction rate = mg/L/sec
40°C Reaction time = 26.3 sec
Reaction rate = mg/L/sec
65°C Reaction time = 14.2 sec
Reaction rate = mg/L/sec
Explanation:
I hope my answer help
Answer:
#1 is 36 (138.5 seconds)
#2 is 146 (34.2 seconds)
#3 is 190 (26.3 seconds)
#4 352 (14.2 seconds)
#5 is 145 (34.5 seconds)
#6 is 173 (28.9 seconds)
#7 is 216 (23.1 seconds)
Explanation:
Edge, we may have different orders.
In a nuclear fission reaction, a freely moving neutron is introduced to a nuclear fuel, such
as uranium-235. What happens next?
O A. The neutron breaks apart.
B. Heat is released by the neutron.
O C. A neutron is absorbed by an atom's nucleus. .
O D. The nucleus becomes unstable.
In a nuclear fission reaction, a freely moving neutron is introduced to a nuclear fuel, then a neutron is absorbed by an atom's nucleus.
What is nuclear fission?Nuclear fission is a process in which an unstable nuclei will convert into stable nuclei after releasing the energy in the form of particles.
When we introduce a freely moving neutron to the nuclear fuel of uranium-235 nuclei then this introduced neutron was absorbed by the nuclei and makes the nuclei more unstable. Then this unstable nuclei will convert into two nuclei in the addition of three neutrons.
Hence, a neutron is absorbed by an atom's nucleus.
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____________is not an effect of heat
a. Expansion
b. Change of state
c. Contraction
d. Chemical change
Answer:
c. contraction
Explanation:
Heating will cause substances to expand, or change their state (like solid to liquid) or it may be a chemical reaction.
Sulfuric acid solid aluminum hydroxide to form liquid water and a solubale salt. What is the balance equation
Balanced chemical equation for the reaction between sulfuric acid & solid aluminum hydroxide to form liquid water and a soluble salt is 3H₂SO₄ + 2Al(OH)₃ Al₂(SO₄)₃ + 6H₂O.
What is balanced equation?Balanced chemical equations are those in which all entities are present in same amount on both sides of the chemical equation.
Balanced chemical reaction for the given compounds will be shown as:
3H₂SO₄ + 2Al(OH)₃ Al₂(SO₄)₃ + 6H₂O
Above chemical equation is the balanced equation as all atoms are present in same amount on the left side as well as on the right side of the reaction.
Hence balanced equation is 3H₂SO₄ + 2Al(OH)₃ Al₂(SO₄)₃ + 6H₂O.
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cold winter morning, a PHS student measured the air pressure in her
be 1.5 atm. The tire was warmed to 15°C and the new pressure was
tm. If the volume didn't change, what was the initial temperature in
re in degrees Celsius?
Find the initial temperature in Kelvin, then convert to Celsius
9°C
3,4°C
26°C
2°C
The topics covered by the study of thermodynamics include:.
Answer:
a. energy changes during heating.
b. energy changes during chemical reactions.
c. color changes during chemical reactions.
d. Both (a) and (b)
Explanation:
The answer is D.Both (a) and (b)
Neon is located in the last group of the periodic table. How many valence electrons does the element neon have? (5 points)
1
2
4
8
Answer:
it's 8
Explanation:
the last group of the periodic table is group 8. so all elements in a group should have the same number of valency electrons
Plssssss helpppppp
Consider a beaker half-filled with water there’s a balloon stretched over the opening and nothing can leak out. What would happen if you placed the beaker/balloon apparatus on a hot plate and let the water come to a boil?
Answer:
The balloon will expand
Explanation:
Steam needs more space than the equivalent wt amount of liquid
Identify the most important type(s) of interparticle forces present in the solid c2h6
Intermolecular forces are the forces present between the molecules. The London dispersion forces are the strongest interparticle forces present in the ethane.
What is LDF?London dispersion forces are the intermolecular forces are the temporary forces present between the induced dipole formed by the electrons occupied in the atom.
The electrons of the atom are distributed symmetrically and are dispersed just as the light in quanta. In ethane molecule ionic, and hydrogen forces are absent and only LDF and dipole-dipole are present.
Therefore, LDF and dipole-dipole are the intermolecular forces that are present in ethane.
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2. A 2.5 mol SAMPLE OF OXYGEN GAS (O2) INCREASES TO 3.2 mol
FROM AN INITIAL PRESSURE OF 720 mmHg. THE VOLUME
CHANGES FROM 34 L TO 45 L, AND THE TEMPERATURE
INCREASES FROM 25°C TO 45°C, WHAT IS THE FINAL PRESSURE
OF THIS GAS?
696.32 mmHg is the final pressure of the gas.
What is an ideal gas equation?The ideal gas equation, pV = nRT, is an equation used to calculate either the pressure, volume, temperature or number of moles of a gas.
Given data:
[tex]P_1[/tex] = 720 mmHg
[tex]P_2[/tex] = ?
[tex]n_1[/tex] = 2.5 mol
[tex]n_2[/tex] = 3.2 mol
[tex]V_1[/tex] = 34 L
[tex]V_2[/tex] = 45 L
Formula
Combined gas law
[tex]\frac{P_1 V_1}{n_1} = \frac{P_2 V_2}{n_2}[/tex]
[tex]P_2[/tex] = 696.32 mmHg
Hence, 696.32 mmHg is the final pressure of the gas.
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How many molecules are in 22g of NaOh
Answer:
40
Explanation:
because NaOH makes 40 grams.
HELP PLEASE I BEG OF YOU
Identify three different alloys in your home. Describe how each alloy is used and why the properties of the alloy make it suitable for that application.
Answer:
Iron - Nails, Utencils, Appliances
Copper - Wiring
Aluminiem - Roofing, Ducting
How many moles of nacl are needed to make 5.2l of a 2m solution
Answer:
10.4 moles
Explanation:
n / 5.2 = 2 M
n = 10.4 moles
The electronegativity of the element affects all of the following except a- type of bond it forms with other elements b- the boiling point of its compounds c- the shape of the molecule it forms d- the ability of its compounds to dissolve in different solvents
The electronegativity of the element affects the ability of its compounds to dissolve in different solvents.
What is the meaning of electronegativity?Electronegativity is a measure of an atom's ability to attract shared electrons to itself.
Polar bonds have a positive and negative side to them, and therefore can attract water dipoles and dissolve in water.
If the polarities of the solvent and solute match (both are polar or both are nonpolar), then the solute will probably dissolve.
If the polarities of the solvent and solute are different (one is polar, one is nonpolar), the solute probably won't dissolve.
Hence, option D is correct.
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renata developed a hair dye additive that is guaranteed to cover grey hair. she granted the right to use this additive to a major hair collor manufacturer, and renata now recives a
What Renata has granted to the manufacturer of the colored hair dye is called a patent.
What is a patent?A patent is a right given to a manufacturer to be the sole producer of a product for a given period of time. Usually, the patent has to last for a given number of years after which the technology becomes commonplace.
Hence, what Renata has granted to the manufacturer of the colored hair dye is called a patent.
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