will mark as brainlest!

What is the wavelength of an electromagnetic wave that travels at 3 x 108 m/s and has a frequency of 60 MHz? (1 MHz = 1,000,000 Hz)

Final answer:

The mass of water produced from the reaction of 3.03 g of butane with excess oxygen is approximately 4.69 grams.

Explanation:

To calculate the mass of water (H₂O) produced from the reaction of butane (C₄H₁₀) with excess oxygen (O₂), we need to use the balanced chemical equation for the combustion of butane:

C₄H₁₀(g) + 6O₂(g) → 4CO₂(g) + 5H₂O(l)

From the balanced equation, we can see that 1 mole of butane produces 5 moles of water. First, we'll need to calculate the number of moles of butane we have:

Butane has a molar mass of 58.12 g/mol (44.10 for carbon + 14.02 for hydrogen), so:

Moles of butane = 3.03 g / 58.12 g/mol ≈ 0.0521 mol

Since 1 mole of butane produces 5 moles of water, the moles of water produced will be:

Moles of H₂O = 0.0521 mol butane x 5 moles H₂O/mol butane = 0.2605 mol H₂O

Finally, we calculate the mass of water produced using the molar mass of water, which is approximately 18.02 g/mol:

Mass of H₂O = 0.2605 mol x 18.02 g/mol ≈ 4.69 g

Therefore, the mass of water produced is about 4.69 g.

Answer:

Number of protons + neutrons

ANSWER C

Answer:- work = 319 J

Solution:- The volume of the gas decreases from 5.35 L to 1.55 L.

[tex]\Delta V=1.55L-5.35L[/tex]  = -3.80 L

external pressure is given as 0.829 atm.

[tex]w=-P_e_x_t\Delta V[/tex]

where w is representing work.

Let's plug in the values and calculate pressure-volume work:

[tex]w=-0.829atm(-3.80L)[/tex]

w = 3.15 atm.L

We need to convert atm.L to J.

1 atm.L = 101.325 J

So, [tex]3.15atm.L(\frac{101.325J}{1atm.L})[/tex]

= 319 J

So, 319 J of work is involved in a chemical reaction. Positive work means the work is done on the system.

Final answer:

To find the amount of work involved in a chemical reaction with a volume decrease, we calculate it using the formula for work, leading to a result of approximately 324.7 Joules.

Explanation:

The question asks for the calculation of work involved in a chemical reaction where the volume decreases under constant pressure. First, to find the work done, we can use the formula W = -PΔV, where P is the pressure and ΔV is the change in volume (final volume - initial volume). Given that the pressure remains constant at 0.829 atm and the volume decreases from 5.35 L to 1.55 L, we have ΔV = 1.55 L - 5.35 L = -3.8 L. To convert this work into joules (J), we use the conversion factor where 1 L·atm = 101.3 J. Therefore, the work done is W = -0.829 atm × -3.8 L × 101.3 J/(L·atm) = 324.7226 J, which can be rounded to approximately 324.7 J.

The number of particles  that  are in 12.7  moles of  compound that Jessica had is     7.65 x10^24 particles  of compound ( answer E)

    Calculation

The number  of particles are calculated  using the Avogadro's Principle  constant.

             what about 12.7 moles  of  compound=   ?  particles\

   by use of  cross multiplication

 N.b moles and moles cancels each  other

Answer:

76.5 x 10^24

Explanation:

This is correct :)

Answer:

First , second energy levels are complete where as third energy level is not.

Explanation:

Electronic configuration is defined as distribution of electrons of an element in its various energy levels.

Chlorine has an atomic number of 17. Which means that its has 17 proton and 17 electrons.

Electronic configuration of chlorine is given as:

[tex]Cl=1s^22s^2p^63s^23p^5[/tex]

Energy level which fully filled are : 1s , 2s , 2p

Energy level which are not fully filled are : 3s, 3p

First , second energy levels are complete where as third energy level is not.

The chlorine atom has 2 electrons in the 1st energy level, 8 in the 2nd, and 7 in the 3rd. The first two energy levels are full while the 3rd energy level is not full as it could accommodate one more electron.

The electron configuration for a chlorine atom is [Ne] 3s2 3p5. This stands for 1s2 2s2 2p6 3s2 3p5 considering the entire configuration. To calculate the total number of electrons in each energy level, we first need to understand that the number in front of the 's' or 'p' (also 'd' or 'f' in larger atoms) represents the principal quantum number, also known the energy level of the electrons.

So, the total number of electrons for each energy level is as follows:

Now, as we know that the 1st energy level (s-orbital) can hold up to 2 electrons, 2nd level (s and p orbitals) can hold up to 8 electrons, and the 3rd one can hold up to 18 (but due to it being a p-element, chlorine will only use up to 8), we conclude that the 3rd energy level is not full because it has 7 electrons while it could hold at least one more.

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One is the plum pudding theory by Thomsons that theorized that positive and negative charges were randomly distributed in an atom. This was later discovered that the positive charge was located at the small nucleus center of the atoms and negative electrons  on the outside.

Another is the aspect in Bohr model theory that electron orbit the nucleus like planets orbit the sun.  Quantum mechanisms have come to disprove this and identify that electron orbit can only be predicted by probabilities and not in the certainty of their position around the nucleus of the atom. They randomly skip and hop (disappear and reappear) at positions around the nucleus.

pretty sure its c 95% sure

The correct answer is A. The solution is acidic in nature.

According to standard PH scale ranges;

So in this solution PH of solution is 8. According to standard criteria unknown solution is acidic in nature.

Jupiter, I believe?

The distance between Jupiter, which is 778.6 million kilometers, and the Sun is approximately 5.2 Astronomical Units (AU). An AU, or the average distance from Earth to the Sun, is approximately 149.6 million kilometers.

The planet whose distance from the Sun is approximately 778,600,000 km is Jupiter. Consider that 1 Astronomical Unit (AU) - the average distance from the Earth to the Sun - is about 149,597,870,700 meters or 149.6 million kilometers. So, when we compare this to the distance of Jupiter, we find it's around 5.2 AU from the Sun. Jupiter, being the largest planet in our solar system and located beyond the asteroid belt, is indeed far from the sun. However, this increases its year length, experiencing longer periods between each full orbit of the Sun.

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Final answer:

The density of the liquid is found by dividing its mass, 0.115 grams, by its volume, 0.265 milliliters, resulting in a density of 0.434 g/mL.

Explanation:

To calculate the density of a liquid, we divide its mass by its volume. In the case of the liquid with a mass of 0.115 grams and a volume of 0.000265 liters, we first convert liters to milliliters (since the density is asked for in g/mL), knowing that 1 L = 1000 mL. Therefore, the volume in milliliters is 0.000265 L × 1000 mL/L = 0.265 mL.

Now we can calculate the density using the formula: Density = Mass/Volume. Substituting the given values: Density = 0.115 g / 0.265 mL = 0.434 g/mL.

The answer is B, protein.

Answer: Option B) is the correct answer.

Explanation:

A polymer is defined as a molecule which has 'n' number of monomer units.

For example, [tex](CH_{2}=CH_{2})_{n}[/tex] is a poly ethene polymer.

Similarly, proteins are also polymers as they are made up of amino acids and contain number of repeated units just like polymers.

Thus, we can conclude that protein is made of polymers.

The compound is S₂O₂ or disulfur dioxide.

S₂O₂ contains two atoms of sulfur and two atoms of oxygen.

It is also known as the dimer of  sulfur monoxide, SO.

Both sulfur and oxygen are nonmetals. So when naming nonmetals we put a prefix before them. 'di' means 2. Since there are two atoms of each element of  sulfur and oxygen, we name S₂O₂ as disulfur dioxide.

Answer:

The compound is S₂O₂ or disulfur dioxide.

Explanation:

Given,  half life of a certain radioactive element = 800 years.

Amount of substance remaining at time t = 12.5%

Lets consider the initial amount of the radioactive substance  = 100%

Using the half life equation:

A = A₀(1/2)^t/t₁/₂

where A₀ is the amount of radioactive substance at time zero and A is the amount of radioactive substance at time t, and t₁/₂ is the half-life of the radioactive substance.

Plugging the given data into the half life equation we have,

12.5 = 100 . (1/2)^t/800

12.5/100 = (1/2)^t/800

0.125 = (0.5)^t/800

(0.5)^3 = (0.5)^t/800

3 = t/800

t = 2400 years

Thus the object is 2400 years  old.

The age of the object can be calculated using the given half-life and the percentage of remaining atoms which is 2888.8 years

The half-life of a radioactive element is the time it takes for half of its radioactive atoms to decay, transforming into a stable form. It's a fundamental concept in nuclear physics and radiometric dating, used to estimate the age of rocks and archaeological artifacts. The half-life of a radioactive element is the time it takes for half of its nuclei to decay. If only 12.5% of the radioactive atoms remain, it means that 87.5% of the atoms have decayed. Using the given half-life of 800 years, we can calculate the age of the object by finding the number of half-lives it would take for 87.5% decay:

Age of half-lives = log2(87.5%) ≈ 3.61

Age of the object = 3.61 x 800 years = 2888.8 years

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B a neutron because it is neutral

If I am correct it should be nucleons

The collection of protons and neutrons in the center of the atom is called the nucleus.

Answer- A

Explanation- Because you have to look at the symbols and remember which symbol goes with each chemical, if you don't then you could get confused.

A. Aluminum oxide. The correct name for the chemical formula Al2O3 is Aluminum oxide, which indicates that the compound is composed of two atoms of aluminum and three atoms of oxygen.

The correct name for the chemical formula Al2O3 is incorrectly named in options B and C. The prefix 'di-' in option D refers to having two of something, but the 'di-' prefix is not typically used in this context with ionic compounds. Therefore, the correct name for this chemical compound is Aluminum oxide (option A), reflecting that it contains two atoms of aluminum and three atoms of oxygen.

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The formula is density = mass / Volume

density = 1.7 g/mL

mass = 95 grams

Volume = ?

1.7 g/mL = 95 g / Volume

Volume = 95 g / 1.7 g/mL

Volume = 55.88 mL

Hope this help!

The four basic needs of all living organisms are air (for respiration), water (a major component of living cells), food/nutrients (to supply energy and materials for growth and repair), and shelter/habitat (for protection from environment and predators).

All living organisms, irrespective of their size or complexity, have four basic needs for survival and proper functioning. These four needs include:

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The balanced decomposition reaction of Potassium chlorate is 2KClO3 —-> 2KCl + 3O2, where the coefficient in front of KCl is 2. Answer to the question is (b) 2.

When balancing the decomposition reaction of Potassium chlorate (KClO3) to form Potassium chloride (KCl) and Oxygen (O2), you will aim to have the same number of atoms of each element on both sides of the equation. The balanced chemical equation for this reaction is:

2KClO3 —-> 2KCl + 3O2

According to the balanced equation, the correct coefficient in front of KCl is 2. Therefore, the answer to the question is (b) 2.

While scalar quantities only include the magnitude, vector quantities include both the magnitude and the direction. Displacement is an example of vector quantities. Therefore, it includes magnitude and direction

mark brailiest please

Answer:

It signifies both magnitude and direction

Explanation:

A vector is a quantity which has both magnitude and direction.

A displacement is vector quantity whose length is shortest distance from initial to final position of a point. Displacement quantifies both distance and direction of imaginary motion along the straight line from initial position to final position.

A cubic centimeter (cm³) is a unit used to measure volume. It is the volume of a cube with an edge length of exactly one centimeter.

A cubic centimeter (cm³) is a unit used to measure volume. It is the volume of a cube with an edge length of exactly one centimeter. One cubic centimeter is equivalent to one milliliter (mL) and is 1/1000 of a liter.

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i am pretty sure it is 4

A sulfur atom has two unpaired electrons. Stable electron configurations are those where all electron shells or subshells are filled.

A sulfur atom, which has an atomic number of 16, has 16 electrons. The electron configuration for sulfur is 1s2 2s2 2p6 3s2 3p4. This shows that there are two electrons in the 1s subshell, two in the 2s, six in the 2p, two in the 3s, and four in the 3p. Unpaired electrons are those which occupy an atomic or molecular orbital by themselves, not forming a pair with another electron. In the case of sulfur, all the electrons in 1s, 2s, 2p, and 3s shells are paired. But in the 3p shell, there are four electrons, meaning two of them are unpaired electrons.

The phrase 'stable electron configurations are likely to contain' refers to atoms with fully filled electron shells or subshells. Atoms strive for a stable configuration, which typically means having full outer electron shells. This is the reason that noble gases are unreactive, as they have completely filled shells.

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conduction:   Conduction is how heat transfers through direct contact with objects that are touching.

Blue is the color that can be best absorbed, as orange is the color seen.

The correct explanation is D.

Sodium being an Alkali Metal has a high tendency to lose its only valence electron to attain Neon configuration. In this process, it becomes positively charged, and hence becomes a Cation.

Chlorine is a non-metal that is one electron short of attaining Argon configuration, and hence readily takes the available electrons to become a negatively charged Anion. Since these two are oppositely charged, by the laws of electrostatics, they attract each other forming an Ionic Bond that requires considerable energy to break.

Answer:

the answer is d).

Explanation:

It has a single valence electron.

3pro & 3ele - it is the single electron in shell 2.

Li has 1 valence electron

Mendeleev organized his periodic table in order of increasing atomic number in 1869.

Dmitri Mendeleev a Russian chemist organized his periodic table in 1869 by increasing atomic mass not atomic number. The organization by increasing atomic number occurred in the 20th century.

The Russian chemist Dmitri Mendeleev first organized the periodic table in 1869. However, it's important to note that Mendeleev initially arranged the elements based on increasing atomic mass. It was not until the 20th century that the periodic table was arranged by increasing atomic number. Thus Mendeleev himself did not organize the periodic table based on atomic number this happened much later after realization that periodic properties of the elements were better correlated with atomic number rather than atomic mass.

Mendeleev also predicted the existence of elements that were not yet discovered during his time and these elements when discovered followed the properties he had anticipated. This offered great validation to his version of the periodic table.

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Answer:

A

Explanation:

i did it on a USA test prep :)