Given the [H+] = 3.89x10^-7M, what is the [OH-]?

Answer:

1.49kJ

Explanation:

Using the formula as follows;

Q = m × c × ∆T

Where;

Q = amount of heat (joules)

m = mass (g)

c = specific heat of silver (J/g°C)

∆T = change in temperature (°C)

According to the information given in this question;

mass of Silver (Ag) = 236g

c of Ag = 0.24 J/g°C

initial temperature (T1) = 8.5°C

final temperature (T2) = 34.9°C

∆T = T2 - T1 = 34.9 - 8.5 = 26.4°C

Using Q = m × c × ∆T

Q = 236 × 0.24 × 26.4

Q = 1,495.3 Joules

Amount of heat needed to raise the temperature of Silver (Q) in kilojoules is 1495.3/1000 = 1.4953

Q = 1.49kJ

Answer:

1.66 basic

Explanation:

Answer:

12.6 g

Explanation:

Step 1: Write the balanced decomposition reaction

2 Fe₂O₃ ⇒ 4 Fe + 3 O₂

Step 2: Calculate the moles corresponding to 18.0 g of Fe₂O₃

The molar mass of Fe₂O₃ is 159.69 g/mol.

18.0 g × 1 mol/159.69 g = 0.113 mol

Step 3: Calculate the moles of Fe formed from 0.113 moles of Fe₂O₃

The molar ratio of Fe₂O₃ to Fe is 2:4. The moles of Fe formed are 4/2 × 0.113 mol = 0.226 mol

Step 4: Calculate the mass corresponding to 0.226 moles of Fe

The molar mass of Fe is 55.85 g/mol.

0.226 mol × 55.85 g/mol = 12.6 g

Answer:

See Explanation

Explanation:

From Gay-Lussac's law of combining volumes;

Equation of the reaction; 2H2(g)  + O2(g) -------> 2H2O(g)

Ratio of volumes;              2           :    1                :    2

Initial volumes;                  500cm^3   500cm^3       0 cm^3

Reacting volumes;          500cm^3    250cm^3      500cm^3

Final Volumes;                0 cm^3        250 cm^3     500 cm^3

We can easily see from the table that the limiting reactant is oxygen.

Hence, the mass of water formed is obtained from;

1 mole of gaseous water occupies 22400 cm^3

x moles of water occupies 500cm^3

x = 500cm^3 * 1 mole/22400 cm^3

x = 0.022 moles of water

Mass of water = 0.022 moles of water * 18 g/mol

Mass of water = 0.396 g

Answer:

21

Explanation:

Answer:

20 degrees

Explanation:

Applying the second law of reflection,

Second Law of reflection: The law of refelection states that the incident angle, reflected angle.

Mathematically, it can be expressed as

i = r...................... Equation 1

From the question, we were told that the light strik the plane at an angle of 20 degrees to the normal.

Therefore,

i = 20 degrees.

If i = 20 degrees,

then,

r = 20 degrees.

Answer:

A.They have high kinetic energy, which can be converted into electrical or mechanical energy

Explanation:

The kinetic energy of the fast-moving water turns turbines, which drive generators that produce electricity. The energy in fossil fuels (coal, oil, gas) is Chemical Potential Energy.

Answer:

Lava flows are streams of molten rock that pour or ooze from an erupting vent. Lava is erupted during either nonexplosive activity or explosive lava fountains. ... But when basalt lava flows are confined within a channel or lava tube on a steep slope, the main body of the flow can reach velocities >30 km/h (19 mph).

Explanation:

Answer:

A. Ernest Rutherford

B.Bohr

C. Eugen Goldstein

D.. Santiago Ramon y cajal

E.john Dalton

F.isobars - a line drawn on a weather map connecting points of equal pressure is called isobars.

example.. argon 40

potassium 40

.two differences between isobars and isotopes.

isobars are those elements which have different atomic number but the same mass number. while isotopes are those elements having the same atomic number and different mass number..

two uses of isotopes.

uranium 235 - for nuclear fission and as fuel in unclear reactors.

# an isotope cobalt - used In the treatment for cancer

# an isotope iodine - used in treatment of goiter.

Answer: Steel wool turns from a gray color to a reddish color after it gets wet and then sits on a counter is a sign of chemical change.

Explanation:

A change that brings change in chemical composition of a substance is called a chemical change.

For example, Steel wool turns from a gray color to a reddish color after it gets wet and then sits on a counter is a chemical change.

This is because steel wool is mostly made up of iron and when iron becomes wet then in the presence of air it gets oxidized and therefore, it gets corroded.

This corrosion appears as reddish color of steel wool and it represents a chemical change has occurred in the steel wool.

Thus, we can conclude that steel wool turns from a gray color to a reddish color after it gets wet and then sits on a counter is a sign of chemical change.

Answer: The new pressure of the gas at this volume is 10 atm.

Explanation:

Given: [tex]V_{1}[/tex] = 250 mL,        [tex]P_{1}[/tex] = 1.00 atm

[tex]V_{2}[/tex] = 25.0 mL,          [tex]P_{2}[/tex] = ?

According to Boyle's law, at constant temperature the pressure of an ideal gas is inversely proportional to volume.

Therefore, formula used is as follows.

[tex]P_{1}V_{1} = P_{2}V_{2}[/tex]

Substitute the values into above formula as follows.

[tex]P_{1}V_{1} = P_{2}V_{2}\\1.00 atm \times 250.0 mL = P_{2} \times 25.0 mL\\P_{2} = 10 atm[/tex]

Thus, we can conclude that the new pressure of the gas at this volume is 10 atm.

gene therapy

Explanation:

Gene therapy, also called gene transfer therapy, the introduction of a normal gene into an individual's order to repair a mutation that causes a genetic disease.

Answer:

C artificial selection

Explanation:

Brainly please

Explanation:

It is assumed that the particles of an ideal gas have no such attractive forces. The motion of each particle is completely independent of the motion of all other particles. The average kinetic energy of gas particles is dependent upon the temperature of the gas.

Answer:

d) group 18

Explanation:

Group 18 on the periodic table consists of noble gasses, which do not chemically interact with other elements.

Balanced chemical reaction: 2KClO₃ → 2KCl + 3O₂.

Potassium is metal from first group of Periodic table of elements, it has always oxidation number in compound +1.

Chlorine in the reactant state has oxidation number +5 (+1 + x + 3 · (-2) = 0) and it is reduced to -1 (+1 + x = 0) in the product state.

Oxygen in the reactant state has oxidation number -2 (+1 + 5 + 3 · x = 0) and it is oxidized to 0 (in molecule of oxygen) in the product state.

Consider this reaction and answer the questions:

             Upper K upper C l upper O subscript 3 right arrow upper K upper C l plus upper O subscript 2.

What is the oxidation number of chlorine in the reactant state?

+5

What is the oxidation number of oxygen in the reactant state?

-2

What is the oxidation number of potassium in the reactant state?  

+1

What is the oxidation number of chlorine in the product state?

What is the oxidation number of oxygen in the product state?

What is the oxidation number of potassium in the product state?

Answer:

Renewable energy is energy from sources that are naturally replenishing but flow-limited; renewable resources are virtually inexhaustible in duration but limited in the amount of energy that is available per unit of time. The major types of renewable energy sources are. Biomass. Wood and wood waste.

Explanation:

Answer:

A renewable resource is one that can be used repeatedly and does not run out because it is naturally replaced.

Explanation:

Answer: 257.23

Explanation:

Answer:

a. 5.77L

b. 700mmHg

c. 395K

Explanation:

Using PV = nRT we can solve these problems where:

P is pressure of the gas in atm (1atm = 760mmHg)

V is volume in liters

n are moles of the gas

R is gas constant: 0.082atmL/molK

T is asbolute temperature in K

a. PV = nRT

V = nRT/P

P = 773mmHg*(1atm/760mmHg) = 1.017atm

T = 25°C+273 = 298K

V = 0.240mol*0.082atmL/molK*298K / 1.017atm

V = 5.77L

b. PV = nRT

P = nRT/V

P = 0.0947mol*0.082atmL/molK*309K/0.635L

P = 0.9216atm * (760mmHg/1atm) = 700mmHg

c. PV = nRT

PV/nR = T

P = 727mmHg * (1atm / 760mmHg) = 0.9566atm

0.9566atm*13.3L/0.393mol*0.082atmL/molK = T

T = 395K

Answer:

Alpha Decay

Explanation:

Answer:

The answer for this would be Alpha Decay

Explanation:

If this is a late answer I apologize but I hope others may find this helpful :)

Answer:

Modern periodic table has eighteen (18) vertical columns. These are called groups

As the bodies present in the gravitational force of sun, so it is appropriate to describe the sun and its celestial bodies as system.

Celestial bodies are those objects which are present in the space not in the land.

In the space all the planets are present in their orbitals under the gravitational force of the sun and do the motion around the sun, because of that force planets are present in the orderly arrangement. Because of the revolution of the earth around the sun, seasons will change on the earth.

Hence, it is appropriate to describe the sun and its celestial bodies as system.

To know more about celestial bodies, visit the below link:

https://brainly.com/question/3735999

Answer:

true

Explanation:

Answer:

Technically yes as the mass is constant...

The mass has no effect on the force of gravitation hence the  ball and cotton  would hit the ground the same way it does here on Earth on the moon.

Force is defined as a cause which is capable of changing the motion of an object. It can cause an object which has mass to change it's velocity. It is also simply a push or a pull . It has both magnitude as well as direction.Hence, it is a vector quantity.

It has SI units of Newton and is represented by'F'.Newton's second law states that force which acts on an object is equal to momentum which changes with time. If mass of object is constant, acceleration is directly proportional to net force acting on an object.

The concepts which related to force are thrust and torque .Thrust increases the velocity of an object and torque produces change in rotational speed of an object.

Learn more about force,here:

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Answer:

Of expected product

Explanation:

Percent yield is the quantity of product actually produced compared to the quantity of expected product and the correct option is option C.

Percent yield is the ratio of actual yield divided by theoretical yield multiplied by 100. It gives information regarding the percentage of products formed in the reaction.

Percentage yield = Actual yield / Theoretical yield × 100

Percent yield is very important in the manufacture of products.

Percent yields are understandably less than  100%, however, percent yields greater than  100% are possible if the measured product of the reaction contains impurities that cause its mass to be greater than it actually would be if the product was pure.

Theoretical yield is the expected amount of products formed in the reaction.

Therefore, percent yield is the quantity of product actually produced compared to the quantity of expected product and the correct option is option C.

Learn more about Percent yield, here:

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