Mass number is equal to the _____.

A. Average atomic mass
B. Number of protons + number of electrons
C. Number of protons + number of neutrons
D. Number of neutrons + number of electrons

Please answer, Will give BRAINIEST

In the given chemical reaction, if equal volumes of ethane ([tex]C_{2} H_{6}[/tex]) and oxygen ([tex]O_{2}[/tex]) are combined, ethane will be the gas left over after the reaction due to its larger required volume of oxygen for complete combustion. The exact volume of ethane remaining can be calculated using stoichiometry and the proportions of the balanced equation.

The balanced chemical reaction is

[tex]\[2C_2H_6(g) + 7O_2(g) \rightarrow 4CO_2(g) + 6H_2O(g)\][/tex]This implies that 2 moles of ethane [tex]C_{2} H_{6}[/tex] react with 7 moles of oxygen([tex]O_{2}[/tex]) to produce carbon dioxide ([tex]CO_{2}[/tex]) and water ([tex]H_{2} O[/tex]) by the process of combustion. As per Avogardo's law, the volume of gases is directly proportional to the number of moles, when the conditions (pressure, temperature) are kept constant.

Since you are starting with equal volumes of ethane and oxygen (14 L), and since ethane requires more oxygen to react (3.5 volumes of oxygen for each volume of ethane), there will not be enough oxygen present to react with all of ethane. Thus, it will be ethane ([tex]C_{2} H_{6}[/tex]) gas that is leftover after the reaction. The volume of that gas remaining can be calculated using stoichiometry and the proportions of the balanced equation.

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Copper wire

Metal is one of best conductors for heat

Convection: the movement caused within a fluid by the tendency of hotter and therefore less dense material to rise, and colder, denser material to sink under the influence of gravity, which consequently results in transfer of heat.

hope that helps :)

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.

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

[tex]n(\text{C}_3\text{H}_7\text{OH}) = N(\text{C}_3\text{H}_7\text{OH}) / N_A\\ \phantom{n(\text{C}_3\text{H}_7\text{OH})} = 5.2 \times 10^{21} / (6.02 \times 10^{23})\\ \phantom{n(\text{C}_3\text{H}_7\text{OH})} = 8.6 \times 10^{-3} \; \text{mol}[/tex]

where [tex]N_A = 6.02 \times 10^{23}\; \text{mol}^{-1}[/tex] the Avogadro's constant that relates the number of particles to their number, in the unit moles [tex]\text{mol}[/tex].

The molar mass of propanol- mass per mole propanol- can be directly deduced from its molecular formula with reference to a modern periodic table.

[tex]M(\text{C}_3\text{H}_7\text{OH}) = \underbrace{3 \times 12.01}_{\text{carbon}} + \underbrace{8 \times 1.008}_{\text{hydrogen}} + \underbrace{1\times 16.00}_{\text{oxygen}} = 60.09 \; \text{g} \cdot \text{mol}^{-1}[/tex]

[tex]8.6 \times 10^{-3} \; \text{mol}[/tex] of propanol molecules would thus have a mass of [tex]8.6 \times 10^{-3} \; \text{mol} \times 60.09 \; \text{g} \cdot \text{mol}^{-1} = 0.52 \; \text{g}[/tex]

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:

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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The terms of a equation, the momentum of an object is equal to the mass of the object times the velocity of the object. where m is the mass and v is the velocity

             The three possible stereoisomers of 1,3-cyclopentanediol are as follow,

                  i) (1S,3R)-1,3-Cyclopentanediol

                  ii) (1R,3R)-1,3-Cyclopentanediol

                  iii)  (1S,3S)-1,3-Cyclopentanediol

Structures of all three compounds are attached below.

Stereoisomers: Also known as spatial isomers are those isomers which have same molecular formula and structural formula but the groups about the chiral center occupy different orientation in space.

Enantiomers: These are stereoisomers of each other which are non-identical mirror-images of each other.

Diastereomers: These are stereoisomers which are not mirror images of each other.

Meso Compounds: These are those isomers which are superimposible on its mirror image.

It has a single valence electron.

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

Li has 1 valence electron

I am not exactly sure the answer that you are looking for, but I will guess on what you might be looking for. If the weight of an object is greater than the weight of the liquid it's being put into, the object will sink. Although, it isn't necessarily just based upon weight, it is more dependent on density to decide if it'll float or sink.

Answer:

It will sink

Explanation:

Hi, this is the result of the Archimedes principle, that states that the push force an object receives from the liquid it is submerged in, is proportional to the volume it displace.

As can be seen in the figure, there are two opposite forces interacting, the weight of the object (P) and the push force (E).

In equations:

[tex]P=m*g[/tex] where g is gravity

[tex]E=\rho_{liq}*V_{liq}*g[/tex]

Also [tex]\rho_{liq}*V_{liq}=m_{liq}[/tex]

So: [tex]\frac{P}{E}=\frac{m*g}{m_{liq}*g}[/tex]

[tex]\frac{P}{E}=\frac{m}{m_{liq}}[/tex]

If m is higher than m_liq, it means that P is higher than E and the object will sink.

i am pretty sure it is 4

Answer:

the answer is d

Explanation:

Answer: Option (D) is the correct answer.

Explanation:

When we use an object or substance in excess then it is likely that the substance will run out with time. But at the same time, if we use that substance according to its requirement and try to conserve it as much as we can then we can preserve the substance.

Hence, it is good to avoid wastage of a substance and balance its use according to the need.

Therefore, we can conclude that in the given situation yes, there is a problem with the solution as the need to conserve copper must be balanced with use.

Answer:- Frequency is [tex]4.80*10^1^4Hz[/tex] .

Solution:- The wavelength of electromagnetic radiation is given as 625 nm and we are asked to calculate the frequency. Frequency is inversely proportional to the wavelength and the formula used to calculate frequency when wavelength is given is:

[tex]\nu =\frac{c}{\lambda }[/tex]

where, [tex]\nu [/tex] is frequency, c is speed of light and [tex]\lambda [/tex] is the wavelength.

Value of speed of light is [tex]\frac{3.0*10^8m}{s}[/tex] . We need to convert the given wavelength from nm to m.

[tex]1nm=10^-^9m[/tex]

So, [tex]625nm(\frac{10^-^9m}{1nm})[/tex]

= [tex]6.25*10^-^7m[/tex]

Let's plug in the values in the formula and calculate the frequency:

[tex]\nu =\frac{3.0*10^8m.s^-^1}{6.25*10^-^7m}[/tex]

= [tex]4.80*10^1^4s^-^1[/tex] or Hz.

So, the frequency of the electromagnetic wave is [tex]4.80*10^1^4Hz[/tex] .

The frequency of an electromagnetic wave with a wavelength of 625 nm is [tex]\boxed{4.8 \times 10^{14} \text{ Hz}}.[/tex]

To find the frequency of an electromagnetic wave, one can use the relationship between the speed of light (c), the frequency (f), and the wavelength (\lambda), which is given by the equation:

[tex]\[ c = f \lambda \][/tex]

 The speed of light in a vacuum is approximately [tex]\( 3 \times 10^8 \)[/tex]meters per second (m/s). Since the wavelength is given in nanometers (nm), we need to convert it to meters to match the units of the speed of light. There are [tex]\( 10^9 \)[/tex] nanometers in a meter, so a wavelength of 625 nm is:

[tex]\[ \lambda = 625 \text{ nm} \times \frac{1 \text{ m}}{10^9 \text{ nm}} = 625 \times 10^{-9} \text{ m} \][/tex]

Now we can rearrange the equation [tex]\( c = f \lambda \)[/tex] to solve for the frequency (f):

[tex]\[ f = \frac{c}{\lambda} \][/tex]

 Substituting the values for c and \lambda:

 [tex]\[ f = \frac{3 \times 10^8 \text{ m/s}}{625 \times 10^{-9} \text{ m}} \][/tex]

[tex]\[ f = \frac{3}{625} \times 10^{14} \text{ Hz} \][/tex]

[tex]\[ f = 4.8 \times 10^{14} \text{ Hz} \][/tex]

 Therefore, the frequency of the electromagnetic wave is[tex]( 4.8 \times 10^{14} \) hertz.[/tex]

The reaction used 82 g of the unknown chemical.

The word equation is  

Chemical 1 + Chemical 2 → Products  

     32 g    +         x g        →     114 g  

The Law of Conservation of Mass tells us the total mass of the reactants must equal the mass of the products. Then  

32 g + x g = 114 g  

x = 114 – 32 = 82

The mass of Chemical 2 was 82 g.  

Answer:

The answer is 1.55 × 1024 on edg.

Explanation:

number with fewer significant figures.

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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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.

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.

Erosion caused the grand canyon to form

This would be either chemical weathering or erosion.

See, the rock was broken down and cracked by any sort of weathering or erosion. It could've been caused by either one of those, honestly.

Have a great day :)

The equilibrium means that amount that are coming equals the amount that are going.

So the correct answers are

2. A person's income and expenses are equal every month.

3. The pressure exerted on the inside of a balloon by the gas inside is equal to the pressure exerted on the outside of the balloon by the atmosphere.

-Hiadamcom/From Agarvated

Answer:

A person's income and expenses are equal every month.

The pressure exerted on the inside of a balloon by the gas inside is equal to the pressure exerted on the outside of the balloon by the atmosphere.

Explanation:

In equilibrium there is balance always.  

Option A is incorrect. Equilibrium would be maintained if the water that falls out of the faucet is re-entered into the faucet.  

Option B is correct. As the income and expense of the person is equal, so what the person spends is equal to what he earns. So the person neither spends more than his income goes to debt nor does the person has some money left after his spending to save or invest.  

Option C is correct. As the pressure exerted on the inside of a balloon by the gas inside is equal to the pressure exerted on the outside of the balloon by the atmosphere, the balloon does not burst. The air pressure is balanced on either side of the balloon.  

Option D is incorrect. Equilibrium would be maintained if the heat gained is equal to the heat lost.  

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.

It would be Calcium: Ca

We can tell which atom has 20 electrons by looking on the periodic table. If we look at number 20 (the atomic number shows how many electrons and protons an atom has) it is Calcium (symbol Ca).

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

B a neutron because it is neutral

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.

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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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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