Does cool air push warm air upward?

Answer:

In chemistry, the law of conservation of mass states that the mass of the products (the chemical substances created by a chemical reaction) will always equal the mass of the reactants (the substances that make the chemical reaction). Think of it as being similar to balancing an algebraic equation.

Explanation:

(winks and runs off)

Answer:

Mass cannot be created or destroyed.

Explanation:

        Conservation of mass is "a principle stating that mass cannot be created or destroyed" (Oxford Languages).

Have a nice day! (there is not much rewording/etc you can do here as it is a simple principle, but I hope this will still help!)

    I hope this is what you are looking for, but if not - comment! I will edit and update my answer accordingly. (ノ^∇^)

- Heather

1 a

2 c

3d

4b

So this the answer that i got i dont know if it is right but if it is not i am sos orry

Answer:

Approximately \(2.890\; \rm m\) (assuming that the speed of light in air is approximately \(2.997 \times 10^{8}\;\rm m \cdot s^{-1}\).)

Explanation:

The wavelength of a wave is the distance (the energy of) that wave covers in one cycle of that wave.

On the other hand, the frequency of a wave gives the number of cycles of that wave in unit time. (If the unit of frequency is \(\rm Hz\) or \(\rm s^{-1}\), one unit time would be one second.)

First step: calculate the period of this wave. That's the same as finding the duration of each cycle of this wave.

The question states that the frequency of this wave is \(f = 103.7 \; \rm MHz = 103.7 \times 10^{6}\; \rm s^{-1}\). In other words, there are \(103.7 \times 10^{6}\) cycle of this wave in every second.

Each of these cycle have the same length. Therefore, the duration of one such cycle would be:

\(\begin{aligned} T &= \frac{1}{f} \\ &= \frac{1}{103.7 \times 10^{6}\; \rm s^{-1}} \approx 9.64320 \times 10^{-9}\; \rm s\end{aligned}\).

That would also be the period of this wave.

Second step: using the speed of this wave, calculate the distance that this wave would travel in each period. That distance would be the wavelength of this wave.

Electromagnetic waves travel at the speed of light. In the air, that speed would be approximately \(2.997 \times 10^{8}\;\rm m \cdot s^{-1}\). That is: \(v\approx 2.997 \times 10^{8}\;\rm m \cdot s^{-1}\).

The first step shows that the period of this wave is approximately \(9.64320 \times 10^{-9}\; \rm s\). Calculate how far this wave would have covered in that much time when travelling at the speed of light in the air:

\(\begin{aligned} \lambda &= v \cdot T \\ &\approx 2.997 \times 10^{8}\;\rm m \cdot s^{-1} \\ &\quad \times 9.64320 \times 10^{-9}\; \rm s \\ &\approx 2.890\; \rm m \end{aligned}\).

In other words, the wavelength of this wave in the air would be approximately \(2.890\; \rm m\).

The number of molecules in 10.0 gram of NaOH is 15 * 10²².

To solve this question, we need to understand some terms of mole concept,

Mole - It is the amount of substance containing same number of molecules or atoms as there are atoms in 12 gram of carbon-12 isotope.

Molecules - It is group of atoms bonded together, representing the smallest fundamental unit of a chemical compound taking part in chemical reaction.

Molecular weight - The sum of atomic masses of all atoms in molecules.

Avogadro number - It is the number of atoms, ions, electrons, molecules in one mole of substance. It is represented as NA.

NA = 6.0 * 10²³ (approx)

To calculate the number of molecules, we apply the formulae,

no. of molecules = moles * NA

moles = weight / molecular weight

moles = 10.0 / 40

          = 0.25

Substituting this value to calculate number of molecules,

no. of molecules = 0.25 * 6.0 * 10²³

                            = 15 * 10²²

Therefore the number of molecules of in 10.0 g of NaOH is 15 * 10²².

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C. All the water would reach an equilibrium temperature and heat would stop flowing.

When hot and cold water are mixed together, heat flows from hotter to colder until both reach a common temperature. This is because the molecules in the hotter water have more kinetic energy than those in the colder water, and so they transfer some of their energy to the colder water until both have the same amount of energy. Eventually, all the water in the mixture will reach the same temperature, and heat transfer will stop. Therefore, the end result of mixing hot and cold water would be that all the water would reach an equilibrium temperature and heat would stop flowing.

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To make 1.00 kg of ²³⁹Pu if the reaction is complete when the product is 90% ²³⁹Pu the time period is 0.357 days.

Definition of Half life

The amount of time it takes for one-half of the radioactive isotope to decay is known as half-life of a radioactive isotope. The half-life of a specific radioactive isotope is constant and it is unaffected by conditions and also independent of the initial amount of that isotope.

Half life of ²³⁹Pu is 2.35 days

K = ln2/t₀.₅

  = ln 2/ 2.35

K = 0.294956/ day

N₀ = 1 kg

Nₐ = 0.91kg

K = 1/t ln N₀/ Nₐ

t = 1/K ln(N₀/Nₐ)

t = 0.357 days

Hence, the time period is 0.357 days.

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Answer:

A

The nuber of each one should be same

Answer:

true im pretty sure

Explanation:

Answer:

I believe it's a.

Explanation:

You with writing ionic compound formulas. An ionic compound consists of a positive ion (cation) and a negative ion (anion) bonded together through electrostatic forces. To write the formula of an ionic compound, you need to balance the charges of the cation and anion to ensure the compound is neutral.

In your example, you have a sodium ion (Na+) and a fluoride ion (F-). The sodium ion has a positive charge of +1, while the fluoride ion has a negative charge of -1. To write the formula for the ionic compound formed by these two ions, you simply combine them in a way that balances their charges. Since the charges are already equal and opposite, you just need to put them together:
Na+ & F- → NaF
The resulting ionic compound is sodium fluoride (NaF). To write formulas for other ionic compounds, follow the same process:
1. Identify the cation and anion involved.
2. Determine the charges of each ion.
3. Balance the charges by adjusting the number of ions as needed.
4. Write the formula, placing the cation first followed by the anion.
Remember to always ensure that the charges are balanced, and the resulting compound is neutral. This method will allow you to write ionic compound formulas effectively.

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Answer:

Many transition metals will have electron configurations slightly different than those predicted by using the Aufbau principle, Pauli exclusion principle and Hund's rule.

For example, using these rules would produce an electron configuration for copper of [Ar] 4s2 3d9. The actual electron configuration for copper will move one electron from the 4s sublevel into the 3d sublevel resulting in [Ar] 4s1 3d10. The copper 1+ ion will have an electron configuration of [Ar] 4s0 3d10 and the copper 2+ ion will have an electron configuration of [Ar] 4s0 3d9. Many other transition elements will show movement of electrons from the highest energy s sublevel into the d sublevel one energy below.

Explanation: here cutie hope it helps ;)

Answer:

thank u for the points

Explanation:

Answer:

Watson and Crick were also aided in their discovery by Maurice Wilkins (1916-2004) and Rosalind Franklin (1920-1958). Franklin had taken X-ray photographs of DNA that her colleague, Wilkins, showed to Watson

Explanation:

Answer:

Rosalind Franklin. She discovered DNA as a double helix form. But men got jealous of her and stole her work just because she is a woman. How cruel! That's why there is something called feminism in this world.  

Explanation:

Hope it helped!

Answer:

94 g/mole

Explanation:

The following answer assumes M is molar mass (g/mole):

One mole of Cl is 35.45 grams.  Since 1 mole of MCl is 74.5 grams, one mole of M will be (74.5-35.45 = ) 39.05 grams/mole.  This just so happens to be the molar mass of potassium, K.  That would mean the compound could be KCl.

We learn from this that M has a single bond.  The oxide of M must take into account the fact that oxygen makes 2 bonds per atom.  That would mean that M ocxide would have the formula M2O.  There are two M's per O.  

M2O would have a molar mass of (2x39.05) + 16 = 94.1 g/mole

The average temperature is 17.0 °C.

The physical concept of temperature indicates in numerical form how hot or cold something is. A thermometer is used to determine temperature.

Thermometers are calibrated using a variety of temperature scales, which historically defined distinct reference points and thermometric substances. The most popular scales are the Celsius scale, sometimes known as centigrade, with the unit symbol °C, the Fahrenheit scale (°F), and the Kelvin scale (K), with the latter being mostly used for scientific purposes. One of the International System of Units' (SI) seven base units is the kelvin law of cosines.

The lowest point on the thermodynamic temperature scale is absolute zero, or zero kelvin, or 273.15 °C.

To find the average temperature, we add up the individual temperatures and divide by the total number of measurements. Let's calculate:

Average temperature = (16.9 + 17.0 + 17.1) / 3 = 51.0 / 3 = 17.0

Therefore, the average temperature is 17.0 °C.

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The food sample contained starch and reducing sugar (carbohydrates).

The Benedict's test is used to test for the presence of reducing sugars, such as glucose, in a sample. When the Benedict's solution is added to a sample containing reducing sugars and heated, the solution will turn brick red.

The iodine test is used to test for the presence of starch in a sample. When iodine solution is added to a sample containing starch, it will turn blue-black.

So, in this case, the student can conclude that the food sample contained both starch and reducing sugars, as both tests produced positive results.

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Answer:

A- Energy from sunlight becomes glucose during photosynthesis

Explanation:

The law of conservational photosynthetic energy states that atoms cannot be created nor destroyed; the atoms can only be rearranged into new molecules and ions. This implies that the enzymes in photosynthesis are aided by energy to transform into glucose, which the plant needs.

Answer: The correct answer is (A)

Explanation:

Answer:

Bari oxit được tạo nên từ các nguyên tố Bari (Ba) và Oxi (O)

Explanation:

The bond order is calculated as follows: Bond Order = (2 x 2) + (2 x 1) / 4 = 6 / 4 = 1.33

The arsenate ion (AsO4 3-) has:

A) Four equivalent resonance structures.

B) There are two double bonds around the central arsenic atom.

C) There are two single bonds around the central arsenic atom.

D) The bond order of all the bonds in the arsenate ion is 1.33. This is because there are two double bonds and two single bonds in each of the equivalent resonance structures, and the average bond order is the sum of the bond orders divided by the number of bonds. Thus, the bond order is calculated as follows:

Bond Order = (2 x 2) + (2 x 1) / 4 = 6 / 4 = 1.33

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Explanation:

Incomplete Parameters provided. The density of This solution is need to solve this question.

steps to take

Find the Mass of Na2CO3 added

Mass=Mole x Molar mass

=0.05x106

=5.3g.

Find the mass of Water added

Knowing that density of Water is 1g/ml

1g/ml x 1000ml/1L x 0.4L

= 400g of Water

Total Mass = 400 + 5.3 = 405.3g

Recall

Density=Mass/Volume

Volume = Mass/density

The density of the solution isnt given

Get that

Input it into the expression above

and get the volume of solution

Molarity = Moles of solute /Volume of solution in L

THAT WOULD GIVE YOUR ANSWER

HAVE A GREAT DAY!!!

Answer:

1.68 atm

Explanation:

Applying

P/T = P'/T'................... Equation 1

Where P = Initial pressure, T = Initial Temperature, P' = Final pressure, T' = Final Temperature.

Make P' The subject of the equation

P' = PT'/T.............. Equation 2

From the question,

Given: P = 2.25 atm, T = 125°C = (125+273) K = 398 K, T' = 25°C = (25+273) K = 298 K.

Substitute these values into equation 2

P' = (2.25×298)/398

P' = 1.68 atm

A buffer solution contains acid molecules and acid radical ions of the same concentration，the known condition is KbƟ(X-) = 1.0×10-9，Then the pH of the solution is B. 5.0.

A buffer solution is an aqueous solution that can withstand minor changes in pH upon the addition of small amounts of an acid or a base. A buffer solution's pH is maintained as a result of the chemical equilibria that exist between the acid and base species in the buffer.

Buffer solutions have a range of applications in the biological and chemical sciences, as well as in industries where keeping a consistent pH is critical to producing high-quality products.

Buffer solution pH is determined by calculating the concentrations of acid and base species and then solving for pH using the equilibrium constant and the acid dissociation constant.

A buffer solution that contains acid molecules and acid radical ions of equal concentrations has a pH that is determined by the pKb of the buffer system. The pH of the buffer solution is calculated using the following equation:

pH = pKb + log (base/acid)

Here is the given information:KbƟ(X-) = 1.0×10-9The acid and the base are both the same concentration. As a result, the concentration of acid equals the concentration of base.

Thus, in the equation:pH = pKb + log (base/acid)The acid and base concentrations are the same, and we can let the base concentration equal "x".Then, the acid concentration = x

The equation becomes:

pH = pKb + log (x/x)= pKb

Therefore,pH = 5.0.  

Therefore, the pH of the solution is 5.0.

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Answer:

It has 1 carbon atom and 4 hydrogen atoms

Explanation:

hope this helps :)

Taking into account the definition of density, the volume of the iron sample is 14.50 cm³.

Density is defined as the property that matter, whether solid, liquid or gas, has to compress into a given space.

In other words, density is a quantity that allows us to measure the amount of mass in a certain volume of a substance.

Then, the expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:

density= mass÷ volume

From this expression it can be deduced that density is inversely proportional to volume: the smaller the volume occupied by a given mass, the higher the density.

In this case, you know that:

Density= 7.86 g/cm³

Mass= 114 g

Volume= ?

Replacing in the definition of density:

7.86 g/cm³= 114 g÷ volume

Solving:

7.86 g/cm³× volume= 114 g

volume= 114 g÷ 7.86 g/cm³

volume= 14.50 cm³

In summary, the volume of the iron sample is 14.50 cm³.

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Answer: When a liquid or gas is heated, the molecules move faster, bump into each other, and spread apart.

Explanation: Because the molecules are spread apart, they take up more space. Therefore temperature can affect density.

Answer:

Yes, of course, temperature does affect the density of liquids. Moreover, it's because when liquids are heated molecules move faster, which results in it taking more space. Also, heat may result in a less denser liquid.

Explanation:

Hope this helps! :D

Answer:

Explanation:

The balanced equation for the reaction between nitric acid (HNO3) and Zinc Hydroxide (Zn(OH)2) is:

2 HNO3 + Zn(OH)2 -------------> Zn(NO3)2 + 2 H2O

This reaction produces Zinc Nitrate (Zn(NO3)2) and water (H2O) as products. The coefficients in front of each element ensure that there are the same number of atoms of each element on both sides of the equation.

The compound C6H12O6 is glucose and it contains three elements; carbon, hydrogen, and oxygen.

There are six carbon atoms, twelve hydrogen atoms, and six oxygen atoms in one molecule of glucose.

The formula for glucose is C6H12O6, which means that there are six carbon atoms, twelve hydrogen atoms, and six oxygen atoms in one molecule of glucose. Therefore, there are three different elements in the compound C6H12O6.

To summarize, the compound C6H12O6 contains three different elements, namely carbon, hydrogen, and oxygen.

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Answer:

C

Explanation:

A gas is a state of matter that has no fixed shape and no fixed volume gases have lower density than other states of matter such as solids and liquids.

1. 0.134 g of Cr is plated out after 2.20 days.
2. 1.39 A of current is required to plate out 0.250 mol Cr in 8.60 h.

To calculate the mass of Cr plated out, we need to use Faraday's law of electrolysis, which states that the amount of substance plated out is directly proportional to the quantity of electricity passed through the solution.

The formula is:

moles of substance plated out = (current x time) / (96500 x number of electrons transferred)

For Cr, the number of electrons transferred is 3, so the formula becomes:

moles of Cr plated out = (6.00 A x 2.20 days x 24 h/day x 3600 s/h) / (96500 x 3)

Solving for moles, we get 0.250 mol. To convert to mass, we use the molar mass of Cr, which is 52.00 g/mol. Therefore, the mass of Cr plated out is:

mass of Cr = 0.250 mol x 52.00 g/mol = 13.0 g = 0.134 g

For the second part of the question, we need to rearrange the formula to solve for the current:

current = (moles of substance plated out x 96500 x number of electrons transferred) / (time)

Plugging in the values, we get:

current = (0.250 mol x 96500 x 3) / (8.60 h x 3600 s/h) = 1.39 A.

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When a Cr⁺³ solution is electrolyzed, the ions undergo a reduction reaction to form solid chromium on the cathode. The balanced equation for this reaction is:
2Cr⁺³ + 6e- → 2Cr(s)
To calculate the mass of chromium plated out after 2.20 days, we need to first determine the amount of charge (Q) that has passed through the cell:

Q = I × t
where I is the current in amperes and t is the time in seconds.
Converting 2.20 days to seconds:
2.20 days × 24 hours/day × 60 minutes/hour × 60 seconds/minute = 190,080 seconds
So, Q = 6.00 A × 190,080 s = 1.14 × 10⁺⁶ C
Next, we can use Faraday's law to calculate the amount of chromium plated out:
moles of e- = Q / F
where F is the Faraday constant (96,485 C/mol e-), so
moles of e- = 1.14 × 10⁺⁶ C / 96,485 C/mol e- = 11.8 mol e-
Since each mole of electrons reduces 2 moles of Cr⁺³ to form 1 mole of Cr, we have:
moles of Cr = 11.8 mol e- × 1 mol Cr⁺³ / 2 mol e- = 5.90 mol Cr
Finally, we can use the molar mass of chromium (52.0 g/mol) to calculate the mass of chromium plated out:
mass of Cr = 5.90 mol Cr × 52.0 g/mol = 307 g Cr
Therefore, after 2.20 days of electrolysis with a current of 6.00 A, 307 g of chromium is plated out.
To determine the amperage required to plate out 0.250 mol of Cr from a Cr⁺³ solution in 8.60 hours, we can use a similar approach.
First, we need to convert the time to seconds:
8.60 hours × 60 minutes/hour × 60 seconds/minute = 30,960 seconds
Next, we can use the same equation as before to calculate the amount of charge required:
Q = (0.250 mol × 3 mol e- / 2 mol Cr⁺³) × (96,485 C/mol e-) = 36,368 C
Finally, we can use the equation for current (I = Q / t) to find the required amperage:
I = 36,368 C / 30,960 s = 1.17 A
Therefore, a current of 1.17 A is required to plate out 0.250 mol of chromium from a Cr⁺³ solution in 8.60 hours.

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Answer:

The velocity of the bb when it reaches a height of 203 m can be determined using the laws of projectile motion. Since the bb is moving vertically upwards, its velocity at that height will be zero.

brainlest?

Answer: v = 83.96 m/s

Assuming the acceleration due to gravity is approximately 9.8 m/s^2, we can use the principles of projectile motion and energy conservation.

Using the equation for the vertical displacement of an object in free fall:

Δy = (v₀² - v²) / (2g)

Δy = vertical displacement (203m)

v₀ = initial velocity (105 m/s)

v = final velocity (not known yet)

g = accerlation due to gravity (9.8 m/s^2)

Lets rearrange the equation to solve for the final velocity:

v = v = √(v₀² - 2gΔy)

Substituting the given values:

v = √(105² - 2 * 9.8 * 203)

v ≈ √(11025 - 3979.6)

v ≈ √(7054.4)

v ≈ 83.96 m/s

Therefore, when the BB pellet is at the height of 203m, its velocity will be approximately 83.96 m/s.