What is the concentration of KBr in a solution prepared by mixing 0. 200 L of 0. 053 M KBr with
0. 550 L of 0. 078 M KBr?
​

Answer:

The first thing that you need to do here is to figure out the mass of the sample.

To do that, you can use its volume and the fact that aluminium is said to have a density of

2.702 g cm

−

3

, which implies that every

1 cm

3

of aluminium has a mass of

2.702 g

.

Explanation:

The best summary of the given passage is Sumerians invented writing by drawing on soft pieces of clay because they needed some way to keep track of what they owned.

In the Mesopotamian areas, Sumer, an ancient civilization, was created. The area between the Euphrates and Tigris rivers is a fertile crescent.

They are well known for a variety of accomplishments, including their breakthroughs in the fields of language, government, architecture, and many others. The Sumerians are responsible for the contemporary human understanding of civilization.

The given text shows their contributions to drawing on soft pieces of clay which was their invention of writing.

Read more about summary here:

https://brainly.com/question/27029716

#SPJ1

Which of the following is the best summary of the passage? Use the notes provided to guide you. Main Idea: The greatest gift the Sumerians gave the world was the invention of writing. Notes: Sumerians invented writing needed to keep records called cuneiform drew on clay tablets used shapes Sumerians The greatest gift the Sumerians gave the world was the invention of writing. The Sumerians were a wealthy people. They needed some way to keep track of what they owned. They began drawing pictures. They used a reed as a pen. They drew on soft pieces of clay. The soft clay was then dried in the sun. The tablet became a permanent record. Later, the Sumerian drawings changed into wedge-shaped symbols. This kind of writing is called cuneiform. By putting symbols together, the Sumerians could write entire sentences.

Sleet ,freezing of raindrops, snowflakes Precipitation

are 4 non examples of condensation .

What is condensation ?

Condensation, the separation of a liquid or solid from a vapor, generally occurs on surfaces that are cooler than the adjacent gas. A substance condenses when the pressure exerted by that vapor exceeds the vapor pressure of the substance's liquid or solid phase at the temperature of the surface on which condensation is occurring. As the steam condenses, heat is released. If this heat is not removed, the surface temperature will rise until it matches the surrounding steam.

If the air does not contain small particles, so-called aerosols, condensation will only occur if the air is extremely supersaturated with water vapor.

To know more about condensation , click the given link ;

https://brainly.com/question/14965475

#SPJ1

Answer:

Whats the question lolzzzz

Explanation:

Answer:

i think is probably A

Explanation:

because at constant temperature, the product of the pressure and volume of a given mass of and ideal gass in a closed system is always constant

Answer:

I believe the answer is A or D

Explanation:

I hope this helps you out!

1) The sun is a stat that is located in the middle of the solar system.

2) It gets squeezed together so lightly that four hydrogen nuclei combine to firm form helium atom. This is called nuclear fusion.

3) Solar flares, coronal mass ejection, high-speed solar wind and solar energetic particles.

Answer:

Lithosphere plate boundaries are found in that area.

Explanation:

Answer:

C is the right answer

Explanation:

Answer:

Me India is located in Asia and its capital name is New Delhi.

Explanation:

\(india \\ 1)india \: is \: the \: 7 \: th \: largest \: country \\ 2)home \: to \: old \: civilizations \\ 3)father \: of \: the \: nation \: mahathma \: gandi \\ 4)country \: is \: divided \: in \: to \: 28state \\ 5)1000of \: lnguages \: 100 \: of \: cultures \: \\ so \: india \: is \: very \: much \: attractive \\ very \: much \: special \\ 1947 \: august15 \: indias \: independce \: day \\ thank \: you \: \\ jai \: hind\)

The energy for 1 mole of photons with a wavelength of 685.4 nm is approximately 2.90 x 10^-22 kJ/mol.

To calculate the energy for 1 mole of photons with a wavelength of 685.4 nm, we can use the equation:

Energy = (hc) / λ

Where:
h = Planck's constant (6.626 x 10^-34 J.s)
c = speed of light (3.00 x 10^8 m/s)
λ = wavelength (in meters)

First, we need to convert the wavelength from nanometers to meters. We know that 1 nm = 1 x 10^-9 m, so the wavelength in meters is:

685.4 nm = 685.4 x 10^-9 m

Now, we can calculate the energy using the equation:

Energy = (6.626 x 10^-34 J.s * 3.00 x 10^8 m/s) / (685.4 x 10^-9 m)

Simplifying the equation:

Energy = 2.90 x 10^-19 J

To convert the energy from joules to kilojoules, we divide by 1000:

Energy = 2.90 x 10^-19 J / 1000 = 2.90 x 10^-22 kJ

Therefore, the energy for 1 mole of photons with a wavelength of 685.4 nm is approximately 2.90 x 10^-22 kJ/mol.

Learn more about photons from the link given below:

https://brainly.com/question/15946945

#SPJ11

: PM2.5 is defined as the mass concentration of particles in the air less than or equal to 2.5 micrometers in diameter.Question 15: False, carbon dioxide (CO2) is not considered a criteria air pollutant.

Question 16: The closest answer is 50%, but the exact percentage is not provided in the question.Question 17: The term "photochemical smog" is most synonymous with ozone (O3), which is a criteria air pollutant.Question 18: True, attainment of ambient air quality standards requires that measured concentrations at all monitoring stations within an air district are below ambient air standards.

Question 14 asks about the definition of PM2.5. PM2.5 refers to particulate matter with a diameter less than or equal to 2.5 micrometers. It represents the mass concentration of particles suspended in the air, which are small enough to be inhaled into the respiratory system and can have adverse health effects.

Question 15 states whether carbon dioxide (CO2) is a criteria air pollutant. Criteria air pollutants are a set of pollutants regulated by environmental agencies due to their detrimental impact on air quality and human health. However, carbon dioxide is not considered a criteria air pollutant because it does not directly cause harm to human health or the environment in the same way as pollutants like ozone or particulate matter.

Question 16 asks about the percentage of carbon monoxide (CO) emissions from mobile sources in Santa Clara County. While the exact percentage is not provided in the question, the closest answer option is 50%. However, it is important to note that the precise percentage may vary depending on specific local conditions and emissions sources.

Question 17 inquires about the criteria air pollutant most synonymous with the term "photochemical smog." Photochemical smog is primarily associated with high levels of ground-level ozone (O3). Ozone is formed when nitrogen oxides (NOx) and volatile organic compounds (VOCs) react in the presence of sunlight, creating a hazy and polluted atmospheric condition.

Question 18 addresses the concept of "attainment" of ambient air quality standards. To achieve attainment, measured concentrations of pollutants at all monitoring stations within an air district must be below the established ambient air quality standards. This ensures that the air quality in the given area meets the required standards for protecting human health and the environment.

Learn more about mass concentration  here:- brainly.com/question/23437000

#SPJ11

a. It takes approximately 10.61 x \(10^{-5\) seconds for a sample of \(N_2O_5\) to decay to 60% of its initial concentration.

b. It takes approximately 1.06 x  \(10^{-5\) seconds for a sample of  \(N_2O_5\) to decay to 30% of its initial concentration.

c. The first order rate constant for the reaction is k = 1.43 x  \(10^{-5\) s.  

A) To find the time it takes for a sample of  \(N_2O_5\) to decay to 60% of its initial concentration, we can use the following equation:

t = ln(2) / k

First, we need to find the initial concentration of \(N_2O_5\). If the half life is 2.05 x 104 seconds at 298K, then the initial concentration of \(N_2O_5\) can be calculated as follows:

C = (1 / (2 x 0.693 x 298)) x (1/2.05 x 104) = 2.38 x \(10^{-10\) mol/m

Next, we can use the equation above to find the time it takes for the concentration of  \(N_2O_5\) to decay to 60% of its initial concentration:

t = ln(2) / k = ln(2) / (1/2.05 x 104) = 10.61 x  \(10^{-5\) seconds

Therefore, it takes approximately 10.61 x 10^-5 seconds for a sample of  \(N_2O_5\) to decay to 60% of its initial concentration.

B) To find the time it takes for a sample of \(N_2O_5\) to decay to 30% of its initial concentration, we can use the same equation as above, but with a different initial concentration:

C0 = (1 / (2 x 0.693 x 298)) x (1/0.3)

t = ln(2) / k = ln(2) / (1/0.3) = 1.06 x  \(10^{-5\) seconds

Therefore, it takes approximately 1.06 x 10^-5 seconds for a sample of \(N_2O_5\) to decay to 30% of its initial concentration.

C) The first order rate constant for the reaction can be calculated using the equation:

k = -d[ \(N_2O_5\)]/dt

where [ \(N_2O_5\)] is the concentration of \(N_2O_5\)and t is time.

The equation for the decay of  \(N_2O_5\) is:

[ \(N_2O_5\)] = [ \(N_2O_5\)](1 - k1t)

To find k1, we can set [ \(N_2O_5\)] = 0.3, which is 30% of the initial concentration, and solve for k1:

[ \(N_2O_5\)] = [ \(N_2O_5\)](1 - k1t) = 0.3

k = -1 / (1 - 0.3) = -1 / 0.7 = 1.43 x  \(10^{-5\) s.

Therefore, the first order rate constant for the reaction is k1 = 1.43 x \(10^{-4\) s.  

Learn more about concentration Visit: brainly.com/question/28564792

#SPJ4

Calculating the amount of product that can be formed by each reactant

Since we have of hydrogen gas, we have more than enough to react all of the nitrogen gas, and the nitrogen gas will be used up before the hydrogen gas. As a result, nitrogen gas is the limiting reactant.

1.2mol Na x (2mol NaBr/2mol Na) = 2 mol NaBr***Limiting

2mol Br2 x (2mol NaBr/1mol Br2) = 2 mol NaBr

2. 1.8mol Na x (2mol NaBr/2mol Na) = 1.8 mol NaBr**Limiting

1.4mol Br2 x (2mol NaBr/1mol Br2) = 2.8 mol NaBr

3. 2.5mol Na x (2mol NaBr/2mol Na) = 2.5 mol NaBr

1mol Br2 x (2mol NaBr/1mol Br2) = 2 mol NaBr***Limiting

4. 12.6mol Na x (2mol NaBr/2mol Na) = 12.6 mol NaBr***Limting

6.9mol Br2 x (2mol NaBr/1mol Br2) = 13.8 mol NaBr

To learn more about limiting reactant to refer:

https://brainly.com/question/14225536

#SPJ1

Answer:

Zinc Carbonate

Zinc Nitrate

Explanation:

If the threshold energy of the reaction 2016O(n, γ) 170 is 15.6 MeV, then the atomic mass of 170Ol can be calculated.

Given:Atomic mass of Ol (15.996415 amu)Atomic mass of neutron (1.008665 amu)M (Ol) = 15.996415 amuM (neutron) = 1.008665 amu Threshold energy of the reaction, E = 15.6 MeV The threshold energy (E) is the minimum amount of energy that an incoming neutron must have to trigger the nuclear reaction or the amount of energy that is needed to supply for the reaction to proceed.

The atomic mass of 170Ol can be calculated as follows:E = [M (n) + M (2016O) - M (170O)] x c²Where c = speed of light, M (n) = mass of neutron, M (2016O) = mass of oxygen-16M (170O) = mass of the oxygen-17, the product of the reaction.Rearranging the above equation:  M (170O) = [M (n) + M (2016O) - E/c²]Thus, M (170O) = [1.008665 + 15.994915 - (15.6 x 10⁶ eV/ (3.0 x 10⁸ m/s)²)] amuM (170O) = 16.98803 amuTherefore, the atomic mass of 170Ol is 16.98803 amu.

To know more about nuclear reaction visit:-

https://brainly.com/question/13315150

#SPJ11

If one form of a gene can mask the appearance of another form, that form is considered dominant over the other form. Option B.

According to Mendel, genes are usually made up of 2 alleles. These alleles can be the same or different. When the alleles are the same, the gene is said to be homozygous. If the alleles are different, the gene is said to be heterozygous.

When the two alleles that make up a gene are different, one will be dominant and the other will be recessive. The dominant gene masks the effect of the recessive gene. In other words, the recessive gene cannot be expressed as long as it coexists with the dominant gene. In order for it to be expressed, it has to be in two copies or a homozygous recessive form.

For the dominant allele, however, only one copy is needed for it to be expressed.

In summary, if one form of a gene can mask the appearance of another form, that form is considered dominant over the other form.

More on genes can be found here: https://brainly.com/question/5519888

#SPJ1

Answer:

sr

Explanation:

sr

Answer:

D: Sr

Explanation:

The complete nuclear fusion of each reaction: 2 1 H (hydrogen) + 2 1 H (hydrogen) → 4 2 He (helium) + 1 0 n (neutron) + D (deuterium) + E (energy)

238 92 U (uranium)

Nuclear fusion is a process by which atomic nuclei combine to form a heavier nucleus, releasing a large amount of energy in the process. In nuclear fusion reactions, lighter elements combine to form heavier ones, resulting in the release of energy. One example of a nuclear fusion reaction is the fusion of two hydrogen atoms, which results in the formation of helium, a neutron, and the release of energy in the form of deuterium and energy (D and E). Another example is the fusion of uranium, which can result in the formation of thorium, helium, and the release of energy in the form of fissile and energy (F and G). These reactions play a crucial role in powering the stars, including our sun, and hold great promise as a clean and virtually limitless energy source for the future.

To know more about nuclear fusion reactions, visit:https://brainly.com/question/10104286

#SPJ4

Answer:

D: 3

E: 2

F: 234

G: 90

Explanation:

You have to get what is on the right to add up to the left in that row.

Also right on edge 2023

Answer:

Option 3, The attraction between the can and the magnet is a pull.

Explanation:

The complete question is

Mr. Wang works in a recycling center. Recyclable materials arrive at the

center mixed together. Workers use magnets to separate steel cans from

other items. Which two statements are true about the force between a steel can and a magnet?

1 Gravity pushes the can toward the magnet.

2 The force between the can and the magnet is a noncontact force.

3 The attraction between the can and the magnet is a pull.

4 The attraction between the can and the magnet is a push

Solution

The force exerted by magnet on steel is the pull force. In magnets unlike poles attract each other (pull force) while the like poles repel (push force). Now, the steel or any ferrous object in the garbage when experience magnetic field develop magnetic field of their own in such a way that their north always faces the south of the external magnet or vice versa.

Hence, the force between a steel can and a magnet is pull force

A guitarist stretch and releases a string while playing the guitar is Kinetic energy is converted into potential energy when the string is released.

When a guitarist plays the guitar, energy is transferred and transformed. As soon as you play the guitar, your body transforms chemical energy into kinetic energy in your fingers and arms. The remaining material is subsequently converted into sound using the strings. How can an electric guitar transform energy? When an electric guitar pick-up is used, the sound (pressure) changes to energy. Your phone converts the sound you make into electrical energy when you use it. The electrical energy in the battery is then utilized by a new phone, which transforms it into sound energy. Hot gases are produced within a power plant using coal.

The string starts to vibrate, and then we have the first component for creating.

g sounds. When the motion of this string interacts with the air surrounding it, the kinetic energy it generates is converted into acoustic energy or “sound.

learn more about kinetic energy here;

https://brainly.com/question/25959744

#SPJ4

Answer:

The answer should be 1-hordephysecine added to the following of symbols.

Explanation:

Answer:

oxygen, carbon, hydrogen, nitrogen, calcium, and phosphorus.

Explanation:

the mass of the human body is made up of six elements: oxygen, carbon, hydrogen, nitrogen, calcium, and phosphorus.

The process in the petroleum industry involves bringing oil and gas to the surface, converting crude oil into other products, and selling those products to customers. The correct choice is B. upstream; downstream.

In the petroleum industry, the process can be divided into three main sectors: upstream, midstream, and downstream. Upstream activities involve the exploration and extraction of crude oil and natural gas from underground reserves. This includes locating oil and gas deposits, drilling wells, and bringing the oil and gas to the surface.

Once the oil and gas are extracted, the midstream sector comes into play. Midstream activities involve the transportation, storage, and processing of the crude oil and natural gas. This includes pipelines, storage tanks, and facilities that separate the oil and gas into different components.

Finally, the downstream sector involves refining the crude oil into various products and selling those products to end consumers. Downstream activities include refining, petrochemical production, distribution, and marketing of the final petroleum products, such as gasoline, diesel, jet fuel, lubricants, and various other chemicals.

Therefore, in the given scenario, the correct choice is B. upstream; downstream, as it represents the process of bringing oil and gas to the surface (upstream) and then converting crude oil into other products and selling them to customers (downstream).

Learn more about crude oil here:

https://brainly.com/question/352552

#SPJ11

Answer:

Synthetic polymers are made up of long chains of atoms, arranged in repeating units, often much longer than those found in nature. It is the length of these chains, and the patterns in which they are arrayed, that make polymers strong, lightweight, and flexible. In other words, it's what makes them so plastic.

Explanation: i tried

The correct calculation for pH is pH = 4.76 + log(0.0950/0.0750) = 4.86.

To calculate the pH of the solution, we need to determine the concentration of the acid and its conjugate base after the reaction between CH3COOH and NaOH. The reaction between the acid and base results in the formation of the conjugate base CH3COO-.

In this case, we have 500 mL of 0.150 M CH3COOH and 0.0200 mol of NaOH. Since NaOH is a strong base, it completely reacts with the weak acid to form the conjugate base. The moles of CH3COOH reacted with NaOH can be calculated by multiplying the volume of CH3COOH by its concentration.

Next, we need to determine the concentration of CH3COOH and CH3COO- in the final solution. The initial concentration of CH3COOH can be subtracted by the moles reacted with NaOH, while the concentration of CH3COO- will be equal to the moles reacted with NaOH divided by the total volume of the solution.

Using the Henderson-Hasselbalch equation, pH = pKa + log([A-]/[HA]), where [A-] is the concentration of the conjugate base and [HA] is the concentration of the weak acid, we can plug in the values and solve for pH.

Out of the given options, the correct calculation for pH is pH = 4.76 + log(0.0950/0.0750) = 4.86.

To know more about conjugate base refer here:

https://brainly.com/question/30086613

#SPJ11

Answer:

4Amps. i can't see other questions clearly

Explanation:

\(using ohms law \\ v = ir\)

I=V/R

I=120/30

I=4amps

4) The current passing through heating coil of the coffee maker is 0.4A.

5) The resistance that allows the battery to produve the given amount of current is 1000Ω.

6) The resistance of the curling iron that draws the given amount of current in the circuit is 10Ω.

Ohm's law states that "the voltage across the cross-section of a conductor is directly proportional to the current passing through it.

It is expressed as;

V = I × R

Where V is voltage, I is current and R is resistance.

For question 4)

So, from the expression above,

V = I × R

I = V / R

I = 12V / 30Ω

I = 0.4A

Therefore, the current passing through heating coil of the coffee maker is 0.4A.

For question 5)

So, from the expression above,

V = I × R

R = V / I

R = 6V / 0.006A

R = 1000Ω

Therefore, the resistance that allows the battery to produve the given amount of current is 1000Ω.

For question 6)

So, from the expression above,

V = I × R

R = V / I

R = 120V / 12.0A

R = 10Ω

Therefore, the resistance of the curling iron that draws the given amount of current in the circuit is 10Ω.

Learn more about Ohm's law here: brainly.com/question/15088213