0.620 L of a 2.6 MKCl solution Express your answer using two significant figures.

Answer:

The right one.

Explanation:

The right one looks like it is getting the most sun.

Gravity causes spacecraft such as stars, planets, moons, and other bodies to orbit one another. Revolution describes this style of movement.

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It is an amine, and it has less polar nitrogen-hydrogen and oxygen-hydrogen bonds.

A compound's boiling point is a physical characteristic. These intramolecular linkages between the molecules that make up a chemical affect these physical characteristics.

Alcohols and amino acids have the same kind of intermolecular linkages. The hydrogen bond is the name of this kind of bond.

The electrical attraction between a hydrogen atom from one molecule and an electronegative atom from a nearby molecule is known as a hydrogen bond.

The strength of the bond is in the following order: H.....F > H.....O > H......N

The H....N hydrogen bonds exist in amines, whereas the H....O hydrogen bonds exist in alcohols.

Consequently, the alcohol's hydrogen bonds are stronger and it will impart a higher boiling point on the compound.

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Answer:uses world like

Explanation:

Answer:

*  Properly dispose of hazardous household items.

*  Reduce or eliminate use of fertilizers and chemical herbicides and           pesticides.

*  Make an appointment to service your septic system

Landscape with native plants.

*  Eliminate bare spots in your yard.

*  Make a rain garden.

WAS THIS HELPFUL......

AutoChina Shanghai 2013 also plays host to the world debut of the latest Bespoke Collection from the world’s pinnacle super-luxury marque.

The Alpine Trial Centenary Collection celebrates an extraordinary moment in Rolls-Royce and automotive history. A century ago this June, four Rolls-Royce Silver Ghosts embarked on the Austrian Alpine Trials, the most arduous test of automotive endurance of the time.

In performing without fault over 1820 gruelling miles of near impassable mountain terrain, the Rolls-Royce works team and privateer entrant James Radley helped cement the marque’s reputation for peerless reliability and mechanical excellence, a reputation the company proudly retains today. In doing so establishing the legend of Rolls-Royce as maker of the ‘Best Car in the World’.

This limited edition of Rolls-Royce Ghosts feature exquisitely crafted design cues that pay tribute to these extraordinary motor cars. The exterior paint hue, for example takes close inspiration from Radley’s Silver Ghost, a car that stands side-by-side with the 2013 model in Shanghai.

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Answer:

The temperature in degrees Celsius of a 7.00 L tank containing 13.57 g of H2 gas (mM = 2.016 g mol-1) if the tank has a total pressure of 6177 Torr and the H2 gas is behaving ideally is approximately -128.11°C. This temperature is calculated using the ideal gas law equation, which relates temperature, pressure, and the amount of gas in the tank.

We must select an acid-base combination with a pKa value close to the target pH in order to construct a buffer with a pH of 4.0. The acetic acid (CH3COOH) and sodium acetate (CH3COONa) combination has a pKa of 4.76, which is sufficiently near to the desired pH of 4.0, as can be seen from the table.

To calculate the required amounts of each component, we can use the Henderson-Hasselbalch equation:

pH = pKa + log([A-]/[HA])

where [A-] is the concentration of the conjugate base (CH3COO-) and [HA] is the concentration of the weak acid (CH3COOH).

We want to prepare 1.0L of a 0.2M buffer, which means we need:

0.2 mol/L x 1.0 L = 0.2 mol of total buffer components

Since the acid and its conjugate base are used in equal amounts, we can split this total amount in half:

0.2 mol/2 = 0.1 mol of CH3COOH and 0.1 mol of CH3COO-

Now we can use the Henderson-Hasselbalch equation to solve for the required concentrations of each component:

4.0 = 4.76 + log([CH3COO-]/[CH3COOH])

-0.76 = log([CH3COO-]/[CH3COOH])

10^-0.76 = [CH3COO-]/[CH3COOH]

0.218 = [CH3COO-]/[CH3COOH]

We know that [CH3COOH] + [CH3COO-] = 0.2 mol/L, so we can use the above ratio to calculate:

[CH3COOH] = (0.2 mol/L) / (1 + 0.218) = 0.162 M

[CH3COO-] = 0.218 x [CH3COOH] = 0.035 M

Therefore, to prepare 1.0L of a 0.2M buffer with a pH of 4.0, we would need to mix 81.6g of acetic acid (CH3COOH) and 3.5g of sodium acetate (CH3COONa) in 1.0L of water.

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Answer:

1st = saturated

Explanation:

Bro first ka answer saturated he

Answer:

C. naturally uncombined with other elements.

Explanation: Calcium is a chemical element with the symbol Ca and atomic number 20. As an alkaline earth metal, calcium is a reactive metal that forms a dark oxide-nitride layer when exposed to air.

Answer:

14

Explanation:

mass number = protons + neutrons

Answer:

B.

Our pupils contract and expand depending on the amount of light at any given time in order to avoid being blinded and to see better in the darkness.

Answer:

0.0000001

0.0000001

1

Explanation:

1. What is the concentration of H+ ions at a pH = 7?

0.0000001 mol/L

2. What is the concentration of OH– ions at a pH = 7?

0.0000001 mol/L  

3. What is the ratio of H+ ions to OH– ions at a pH = 7?

1 :1
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Answer:

Trigonal Pyramidal

Explanation:

Here, we want to get the molecular geometry of ammonia

To get this, we have to look at the placement of the hydrogen atoms around the central nitrogen

Although there are 4 electron pairs and it is expected that ammonia is tetrahedral, the shape we have is a trigonal pyramidal shape because of the lone pair of electron

Answer:Water cycle explains the recycling of water through the ecosystem. Nitrogen cycle describes the recycling of nitrogen through living (biotic) and non-living (abiotic) components of an ecosystem. Water changes its state when cycling while nitrogen changes its chemical form when cycling.

Explanation:

Answer:

C. 96,657 Pa, 966 millibar, 725 Torr

Explanation:

The pressure of 725 mmHg in Pa, millibars, and Torr is 96,657 Pa, 966 millibar, 725 Torr. Hence option C is correct.

Pressure is defined as the force that is applied perpendicularly to an object's surface in relation to the area that it is dispersed over. Pressure can actually be a very good thing. Stress only occurs and has a fully negative impact when it continues to grow and that sensation of serenity and order is replaced with one of being out of control.

Given pressure = 725 mmHg

1 mmHg = 133.32 Pa

725 mmHg = 133.32 x 725 Pa

                  = 96,657 Pa

1 mmHg = 1.333 millibar

725 mmHg = 725 x 1.333 millibar

                   = 966 millibar

1 mmHg = 1 torr

725 mmHg = 725 Torr

Thus, the pressure of 725 mmHg in Pa, millibars, and Torr is 96,657 Pa, 966 millibar, 725 Torr. Hence option C is correct.

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The matter is substances is present everywhere, including the mixtures, elements, and compounds. Mixtures are matter that can be separated by physical methods.

Mixtures are defined as substance and matter that is made of two or more components (substances) that are not bonded or linked chemically and rather shows physical interaction.

A mixture for example of sand and water can be physically separated by filtration, seawater by evaporation, etc. Whereas, a compound involves chemical interactions that are not separated by physical means.

Therefore, a mixture can be separated by physical process.

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Answer:

It would would be oxidized.

Explanation:

Sorry I can't explain it.

Chlorine gains an electron in a redox reaction, it would be reduced.

Chemical reactions can be described as the transfer of electrons from one chemical substance. The electron-transfer reactions are named oxidation-reduction reactions or redox reactions.

The reactions can be accompanied by energy changes in the form of heat, light, electricity, etc. The oxidation and reduction reaction involves the addition of oxygen or hydrogen respectively to different substances.

The reduction can be described as a process that involves the addition of hydrogen. It can also be defined as the process in which an atom or ion accepts one or more electrons.

Oxidation can be described as a process that involves the addition of oxygen. Oxidation can be defined as the process in which an atom or ion donates or loses one or more electrons.

As the chlorine accepts electrons so it gets reduced.

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Answer:

12.69g

Explanation:

as you see in the equation the number of moles for zinc hydroxide is same the water so,

0.705=mass\18mol g^-1

mass of water    = 12.69g

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4.5 billion years old

hope this helps

Answer:

Earth's water is 4.5 billion years old.

Explanation:

Water is a transparent, odorless, tasteless liquid, a compound of hydrogen and oxygen, H2O, freezing at 32°F or 0°C and boiling at 212°F or 100°C, that in a more or less impure constitutes rain, oceans, lakes, rivers, etc.: it contains 11.188 percent hydrogen and 88.812 percent oxygen, by weight.

Part i) We will use the ideal gas law to answer this question:

We will determine number of moles of nitrogen gas by using the ideal gas law then use this information to calculate the mass.

Part i) Answer: The mass of nitrogen gas in the tyre is 22.68g.

Part ii) For this question we will use the ideal gas law as well in addition to the number of moles that was determined in part 1 and the new temperature. The temperature in K is 323.15K

Part ii) Answer: The new pressure will be 217.62 kPa

The energy released in the nuclear reaction of 4H → He + 2e+ + 2ve is 2.224 MeV.

Recall that the mass-energy equivalence formula,

   E=mc²

We need to convert the masses from atomic mass units (u) to kilograms (kg) first, and then multiply by the speed of light squared (c²) in units of meters per second.

The change in mass between the reactants and products is:

Δm = (4.00150 u - 4 x 1.00723 u) x 1.66054 x 10⁻²⁷kg/u

= 0.02916 kg

where we have used the conversion factor 1 u = 1.66054 x 10⁻²⁷kg/u

The energy released is then:

E = Δm x c² / (1.60218 x 10⁻¹³ MeV/J)

= 0.02916 kg x (299792458 m/s)² / (1.60218 x 10⁻¹³ MeV/J)

= 2.224 MeV

Therefore, the energy released in this nuclear reaction is 2.224 MeV.

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For this question we are using a formula that will show us what happens to a substance when it undergoes dissolution, the formula is:

M1*V1 = M2V2

Where:

M1 = initial concentration, 3*10^-4 M

V1 = initial volume, 0.2 mL

M2 = final concentration, ?

V2 = final volume, 10 mL

Now we add the values into the formula:

3*10^-4 * 0.2 = M2*10

6*10^-5 = 10M2

M2 = 6*10^-6, or 0.000006 M, this will be the final concentration

The "Wakanda speech," six weeks have passed, and the world is still in shock.

Thus, Global leaders and analysts were taken aback by King T'Challa's declaration at the United Nations General Assembly that the Kingdom of Wakanda is not a developing country of textiles, farms, and shepherds with a GDP per person of roughly $760 but rather a technological superpower and Wakanda speech.

The country's widespread employment of cutting-edge magnetic levitation trains, flying machines, opaque holograms, and spinal cord-healing beads has led to the coining of the phrase "uber-developed" nation.

The most watched video ever is currently "Welcome to the Future," an introduction video created by Wakanda's recently established Ministry of Foreign Affairs.

Thus, The "Wakanda speech," six weeks have passed, and the world is still in shock.

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Matter are anything that is made up of atoms. The quantity of matter can be observed only on the basis of mass and volume calculation. Thus option C is correct option.

Matter is a substance that has some mass and can occupy some volume. The matter is mainly used in science. Matter can be solid, liquid or gas.

Matter is anything that is made up of atoms. Anything around us that can be physically seen and touched are matter. Ice, water and water vapors are example of matter.

Giant planet atmospheres have layers of clouds and aerosols (tiny liquid droplets) made from different chemicals because different chemicals condense at different temperatures.

Therefore,  option C is correct option.

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Answer:

A) actual yield

Explanation:

Theoretical yield is the amount of product expected based on the stoichiomety.

Percent yield is the actual yield over the theoretical yield.

Answer:

In fact yes

Explanation:

In fact, only a small amount of a growth regulator such as 2,4-D is needed to kill some plants. ... That is the reason why some w^eeds, including dandelions

Forest is a habitat for many plants and animals because it provides a suitable environment for them.

Forest is a habitat for many plant life and animals as it offers a appropriate environment for them. As an instance, neem, Sheesham, Palash, tiger, porcupine, elephants, jackal and so forth. The ground beneath the tree of the forest is the forest floor.

It causes habitat destruction, accelerated chance of predation, reduced food availability, and lots greater. As a result, some animals lose their homes, others lose meals assets – and ultimately, many lose their lives. In reality, deforestation is one of the essential causes of extinction.

Weather trade also alters the life cycles of flora and animals. as an instance, as temperatures get warmer, many plant life are starting to develop and bloom earlier inside the spring and live to tell the tale longer into the fall. A few animals are waking from hibernation sooner or migrating at different instances, too.

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Answer:

Glossary: Electromagnetic wave. Definition: Electromagnetic radiation is generated by the vibration of electrons or other electrically charged particles

Explanation:

Precision relates to the consistency and reproducibility of measurements, while accuracy reflects how close measurements are to the true value.

Precision and accuracy are two important concepts in the context of errors in measurements. While they both pertain to the quality of data, they refer to different aspects.

Precision refers to the degree of consistency or reproducibility in a series of measurements. It reflects the scatter or spread of data points around the average value. If the measurements have low scatter and are tightly clustered, they are considered precise. On the other hand, if the measurements have a high scatter and are widely dispersed, they are considered imprecise.

Accuracy, on the other hand, refers to the closeness of measurements to the true or target value. It represents how well the measured values align with the actual value. Accuracy is achieved when measurements have a small systematic or constant error, which is the difference between the average measured value and the true value.

Errors in measurements can be classified into two types: random errors and systematic errors.

Random errors are associated with the inherent limitations of measurement instruments or fluctuations in the measurement process. They lead to imprecise data and affect the precision of measurements. Random errors can be reduced by repeating measurements and calculating the average to minimize the effect of individual errors.

Systematic errors, on the other hand, are caused by consistent biases or inaccuracies in the measurement process. They affect the accuracy of measurements and lead to a deviation from the true value. Systematic errors can arise from factors such as instrumental calibration issues, environmental conditions, or experimental techniques. These errors need to be identified and minimized to improve the accuracy of measurements.

In summary, precision refers to the degree of consistency or reproducibility of measurements, while accuracy refers to the closeness of measurements to the true value. Random errors affect precision, while systematic errors affect accuracy. To ensure high-quality measurements, both precision and accuracy need to be considered and appropriate techniques should be employed to minimize errors.

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