Answer:
How do you find the concentration of OH in a solution?
The hydroxide ion concentration can be found from the pOH by the reverse mathematical operation employed to find the pOH. [OH-] = 10-pOH or [OH-] = antilog ( - pOH) Page 2 Example: What is the hydroxide ion concentration in a solution that has a pOH of 5.70? On a calculator calculate 10-5.70, or "inverse" log (- 5.70).Explanation:
help!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Answer:
b
Explanation:
i beleave the answer is b i read it and it looks like the best option hope it helps
# 16 of Approaching Equilibrium
For the reaction system A₂(g) + B₂(g) = 2AB(g)
the equilibrium constant K= 6.2
A system using this reaction was being tried in a 1.00 L reactor. It was charged with 0.20 mol A2, 0.15 mol B₂ and 0.60
mol AB.
The system was allowed to come to equilibrium. Which statement below describes the system coming to equilibrium?
(Note: in the answers, Q refers to the reaction quotient, K refers to the equilibrium constant).
Select one:
O a. The reaction goes to the right, more products will form because Q < K
O b. The reaction goes to the left, more reactants will form because Q > K
O c. The reaction goes to the right, more products will form because Q > K
O d.
It is not possible to predict in which direction the system will travel to arrive at equilibrium.
e.
The reaction goes to the left, more reactants will form because Q < K
From the calculation, Q >K, the reaction proceeds towards the left and more reactants will form.
What is equilibrium constant?The term equilibrium constant refers to the value that could indicate the extent of conversion of reactants to products.
Thus, given that the equilibrium constant for the reaction A₂(g) + B₂(g) = 2AB(g) is 6.2, the Qc is obtained from;
Qc = [0.60]^2/[0.20] [0.15]
Qc = 0.36/0.03
Qc = 12
Since Q >K, the reaction proceeds towards the left and more reactants will form.
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Equilibrium Constant Calculation
For the reaction A(g) + B(g) 2 C(g) the following equilibrium concentrations were found:
[A(g)] = 0.232 mol/L
[B(g)] = 0.251 mol/L
[C(g)] = 0.750 mol/L
Calculate the value of the equilibrium constant Ke. Give 3 significant figures in your answer.
The value of the equilibrium constant, Ke given the data from the question is 9.660
What is equilibrium constant?Equilibrium constant for a given is defined as the concentration of the products raised to their coefficient to the concentration of the reactants raised to their coefficient
For example:
eB <=> cD
The equilibrium constant for the reaction above is given as
Ke = [D]^c / [B]^e
How to determine the equilibrium constantThe following data were obtained from the question:
A(g) + B(g) <=> 2C(g)[A(g)] = 0.232 mol/L[B(g)] = 0.251 mol/L[C(g)] = 0.750 mol/LEquilibrium constant (Ke) =?The equilibrium constant for the reaction reaction can be obtained as follow
Ke = [C]² / [A][B]
Ke = [0.75]² / [0.232][0.251]
Ke = 9.660
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Which is balanced properly
Answer:
The second one
Explanation:
The second one
there are 4 Fe atoms on the left and 4 on the right
and there are 6 O atoms on each side
balanced
Calculate the volume of a 1.50M HCl solution that contains 0.920 mol of HCI. (SHOW WORK)
Answer:
= 0.613dm^3
Explanation:
Data:
Molarity, M = 1.50M
no. of moles = 0.920 moles
volume=?
Solution:
as, molarity= [tex]\frac{moles}{volume in dm^3}[/tex]
so, volume =[tex]\frac{moles}{molarity}[/tex]
putting values:
= [tex]\frac{0.920}{1.50}[/tex]
volume = 0.613dm^3
Explain the relashionship between carbon dioxide, the human population and use of fossil fuels.
Answer:
More people means more demand for oil, gas, coal and other fuels mined or drilled from below the Earth's surface that, when burned, spew enough carbon dioxide (CO2) into the atmosphere to trap warm air inside like a greenhouse
Explanation:
hope this helps
pls mark brainliest
A bike tire has a volume of 0.850L at a pressure of 40.0 psi and 0.00°C. What will be the
pressure of the tire at 35.0°C?
Answer:
45.13 psi
Explanation:
Assuming the volume does not change
P1/T1 = P2/T2 T must be in Kelvin
40/(273.15) = P2/(273.15 + 35) P2 = 45.13 psi
Which of the following is the most likely impact of clearing natural landscape to construct high-rise buildings?
Decrease in pollution
Scarcity of drinking water
Increase in animal population
Abundance of non-native plants
Answer:
the abundance of non-native plants. this MAY be right.
Explanation:
i thought it would be an increase in pollution.
Task
Determining Heat Gain and Loss
In this activity, you’ll heat an object in hot water and then transfer it to cool water. The object will become cooler, and the cool water will become warmer. Based on the temperature changes, you’ll calculate and compare the heat lost by the object and the heat gained by the water. To begin, choose an object (or objects) made of a known material and that can be immersed in water without causing damage.
Before you begin this task, read these lab safety guidelines. If you’re using an electronic balance, watch this video about measuring mass.
Estimated time to complete: 1 hour
If you’re using an Edmentum lab kit, remove the electronic balance and thermometer from the kit. These materials are italicized in the following equipment list. Then gather any additional items shown in the list. If you’re not using an Edmentum lab kit, alternatives are suggested in parentheses. If you don't have these alternative materials at home, please check with your teacher for help.
You’ll need these materials:
electronic balance (may also use a kitchen scale, readable at least to the nearest gram)
thermometer, readable at least to the nearest degree from 0°C to 100°C (32°F to 212°F)—readings to the nearest tenth of a degree will produce better results
foam cups (2)
lids to fit the cups (may use squares of cardboard as lids)
solid object (or group of objects) of a known material that can fit easily in the cup, ideally having a total mass of 25 to 60 grams; here are some ideas:
2–5 plastic dominoes, depending on size
5–10 glass marbles, depending on size
10 quarters
tongs
pen or marker
stove, hot plate, or microwave oven
container for heating water (depends on the selected heat source)
Part A
Begin the task by performing these steps. Record your observations in the table provided.
Label the foam cups with the numbers 1 and 2.
Record the type (and quantity, if applicable) of object you will be using. Include what kind of material the object is made of.
Determine the specific heat capacity of the chosen object from this list of specific heat capacities. If you can’t locate your material on the list, do an online search.
Use the electronic balance to measure the mass of the chosen object(s). Record the mass. Then, place the object(s) into cup 1.
Answer:
The water warms to a temperature of 28.1°C. Determine the specific heat capacity of the zinc. Now this 229.9 J is equal to the -Qmetal. The specific heat capacity of the metal can be calculated by setting -229.9 J equal to m•C•ΔT.
...
Heat and Changes of State.
Explanation:
C + 2H2 -> CH4
For the reaction shown here, predict the number of moles of hydrogen gas needed produce 32 grams of methane.
A) 1
B) 2
C) 4
D) 8
Answer:
C) 4
Explanation:
The reaction :
C (s) + 2H₂ (g) ⇒ CH₄ (g)12g 4g 16g
Hence, based on this we can say that : 2 moles of hydrogen gas are needed to produce 16g of methane.
For 32g of methane
Number of moles of H₂ = 32/16 × 2Number of moles of H₂ = 4According to the stoichiometry, 8 moles of hydrogen gas are needd to produce 32 g of methane.
What is stoichiometry?Stoichiometry is the determination of proportions of elements or compounds in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.
Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample. It is a quantitative study of reactants and products. Stoichiometric conversions make use of mass and moles.In the given example and according to the chemical reaction given,as 4 moles of hydrogen produce 16 g methane,∴for 32 g methane, 32×4/16=8 moles.
Thus , 8 moles of hydrogen gas are required to produce 32 g of
methane.
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help me with this one please.
calculate the solubility of AgCl in:
100ml of 4×10^-3M calcium nitrate
(Ksp is = 1.6 ×10^-10)
What is the reciprocal of cell constant?
Explanation:
resistivity is the reciprocal of cell constant
An alpha particle is made up of
O one proton and one neutron
Otwo protons and two neutrons
Oone electron
Otwo electrons
Answer: two protons and two neutrons
Explanation:
An alpha particle is just a helium-4 isotope, which obviously has 2 protons and 2 neutrons.
A process in which a large nucleus splits into two or more parts is called ?
(A) nuclear fission
An alpha particle is made up of _____.
(C) two protons and two neutrons
Which statement best describes the type of radioactive decay shown in the model?
(D) The model shows alpha decay, which is a type of nuclear fission.
Is beta decay a form of nuclear fission?
Responses
(A) No, it is not because the mass number does not change.
Which statement correctly classifies gamma emission?
(D) Gamma emission is a type of radioactive decay, but it is not a fission reaction.
Explanation:i just did the quick check, hope this helps UwU
Perform the following
mathematical operation, and
report the answer to the
correct number of significant
figures.
0.0030 × 8.65= [?]
Answer: 0.02595 is your answer I looked it up
Answer:
.03
Explanation:
a 20.0 L container of helium used to fill balloons is at a pressure of 150 atm and a temperature is 30.0 C. How many balloons can be filled to 5.0 L, if the temperature is 22 C and the atmospheric pressure is 1.05 atm?
The number of balloons that can be filled by the container of helium is 380.
To calculate the number of balloons that can be filled, we use the formula below.
Formula:
N = PVT'/P'V'T........... Equation 1\Where:
N = Amount of balloons that can be filled by the containerP = Pressure of helium in the containerV = Volume of helium the containerT = Temperature of the containerP' = Pressure of the balloonV' = Volume of the balloonT' = Temperature of the balloon.From the question,
Given:
P = 150 atmV = 20 LT = 30 °C = 203 KP' = 1.05 atmV' = 5 LT' = 22 °C = 295 KSubstitute these values into equation 1
N = (150×20×295)/(5×1.05×203)N = 380.4 balloonsN ≈ 380 balloons.Hence, the number of balloons that can be filled by the container of helium is 380.
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Helium gas occupies a volume of
12.5 Lat -45 degrees Celsius. What
volume will it occupy at 15 degrees
Celsius?
Answer:
15.79 L
Explanation:
V1 /T1 = V2/T2
Re-arrange to:
V1/T1 * T2 = V2 Note that T must be in units K
12.5/ ( -45 + 273.15) * ( 15 + 273.15) = 15.79 L
Bases contain hydroxide, which is a
# 12 of Equilibrium Constant
Consider the chemical system:
2 NO(g)
N₂(g) + O₂ (g)
K = 2.1 x 1030
How do the equilibrium concentrations of the reactant compare to the equilibrium concentration of the products?
Select one:
O a. They are much lower
O b. They are much higher
O c.
They are about the same order of magnitude
O d. They have to be exactly equal
e.
You can't tell from the information given
Answer:
of Equilibrium Constant
Consider the chemical system:
2 NO(g)
N₂(g) + O₂ (g)
K = 2.1 x 1030
How do the equilibrium concentrations of the reactant compare to the equilibrium concentration of the products?
Select one:
O a. They are much lower
O b. They are much higher
O c.
They are about the same order of magnitude
O d. They have to be exactly equal
e.
You can't tell from the information
Explanation:
of Equilibrium Constant
Consider the chemical system:
2 NO(g)
N₂(g) + O₂ (g)
K = 2.1 x 1030
How do the equilibrium concentrations of the reactant compare to the equilibrium concentration of the products?
Select one:
O a. They are much lower
O b. They are much higher
O c.
They are about the same order of magnitude
O d. They have to be exactly equal
e.
You can't tell from the information
Name the two geometrical isomer of hydrocarbon
Answer:
alkenes and cyclic compounds
Using the solubility curve above, what is the solubility of KBr when the temperature is 80°C?
A) 86 g/100 g water
B) 90 g/100 g water
C) 96 g/100 g water
D) 102 g/100 g water
Answer:
C) 96 g/100 g water
Explanation:
If you look for 80°C in x axis and move up from their until you hit the line for KBr, you will see that you hit the KBr line b/w (90-100 in y-axis) thus the closest answer is C) 96 g/100 g water
Determine the oxidation number if each atom in the following compunds: sodium chloride and iron(||) oxide.
Explanation:
see the picture for the answer
Define reaction rate.
a. An unstable arrangement of atoms that forms momentarily at the peak of the activation-energy
barrier
b. The minimum energy that colliding particles must have in order to react
c. A measure of speed of any change that occurs within an interval of time
d. Atoms, ions, and molecules can react to form products when they collide with one another,
provided that the colliding particles have enough kinetic energy.
Answer:
B
Explanation:
Answer:
B
Explanation:
Reaction rate can be defined as :
the minimum energy that colliding particles must have in order to react
he density of water is 1 g/mL.
How many times greater is the density of lead if density of lead is 11.3 g/mL?
How many times less dense is the density cork if its density is .24 g/mL?
#1
Density of lead=11.3g/L
Times greater
11.3/1=11.3times#2
Density of cork=0.24g/mL
Times lesser
0.24/10.24timesHow many moles of sodium chloride (NaCl) are in (4.2x10^-41) molecules of sodium chloride (NaCl)?
The number of moles of sodium chloride in (4.2 x 10⁻⁴¹) molecules of sodium chloride is 6.973 × 10⁻⁶⁵
What are a number of moles?The mole is a SI unit of measurement that is used to calculate the quantity of any substance.
1 mole is 6.022 × 10²³
[tex]1\; molecule = \dfrac{1}{6.023 \times 10^2^3}[/tex]
The given number of moles are 4.2 x 10⁻⁴¹
[tex]Moles = 4.2 \times 10^-^4^1 \times \dfrac{1}{6.023 \times 10^2^3} = 6.973 \times 10^{-65}[/tex]
Thus, the number of moles of sodium chloride in (4.2 x 10⁻⁴¹) molecules of sodium chloride is 6.973 × 10⁻⁶⁵
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Which one is one pkease?
[tex]\qquad\qquad\huge\underline{{\sf Answer}}[/tex]
The Correct choice is D. Fe + S = FeS
because, in nature Iron (Fe) and Sulphur (S) are found in mono - Atomic form. so, There will be 1 Fe atom reacting with 1 S atom to form FeS (Iron sulphide)
Oxygen always become negatively charged when it forms covalent bonds true or false?
Answer:
I think false
Explanation:
bcs oxygen can create good feeling in our body
The provided map shows the location of an earthquake under the ocean.
The data on the map would best support a prediction of which of the following events?
O A tsunami in Sri Lanka
O An earthquake in South Africa
O A hurricane in Somalia
O Flash floods in Madagascar
Answer:
Option 1
Explanation:
An underwater earthquake will most likely cause a tsunami. Sri Lanka lies very close to the source of the earthquake, hence the answer is :
A tsunami in Sri Lankacurrent is created by the movement of what subatomic particle?
Answer:
I believe the answer is electrons.
Explanation:
Protons can't move and neurons don't have a charge so it would be electrons.
Make sure your answer includes TWO decimal places. this is an impossible formula. If it were real, determine the molar mass of:
KBr•7H2O
Molar mass is the summation of the atomic mass of the individual atoms. The molar mass of KBr•7H₂O is 244.99.
What is atomic mass?Atomic mass or weight is the number of protons and neutrons in the atom of the individual element. The atomic masses are used to calculate the molar mass of the compound.
The compound KBr•7H₂O: 1 K + 1 Br + 14 H + 7O
Inserting the atomic masses of the individual atoms as:
= 1 (39.09) + 1 (79.90) + 14 (1.00) + 7(16)
= 39.09 + 79.90 + 14.00 + 112
= 244.99
Therefore, 244.99 is the molar mass of KBr•7H₂O.
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1- If 154.0 grams of potassium metal reacts with excess water, then how many grams of
potassium hydroxide and hydrogen gas are formed? What volume of hydrogen gas, in liters, is formed at STP? Be sure to balance the reaction first.
___K(s) + ____H2O(l) → ____KOH(aq) + ____H2(g)
2- The burning of solid sulfur in air produces sulfur dioxide gas.
S + O2 → SO2
Balance the reaction. How many moles of sulfur dioxide does the burning of 3 moles of sulfur form? Calculate the volume of sulfur dioxide produced at STP.
So
4K+4H_2O—⟩4KOH+2H_2Moles of Potassium
154/393.9molSee molar ratio is same for K,KOH,H_2O i.e 4 .
So same moles of allMass of Water
3.9(18)70.2gMass of KOH
56(3.9)218.4g#2
S+O_2—»SO_2Balanced already
3 mols of S form 3 mol SO_2
At STP 1mol=22.4L
Volume=22.4(3)=67.2L