What is the wavelength of a 2.99 s -1 wave? (provide work plz)

Answer:

i dont know how exactly you want this but ill give it a go

the sun is a star, the diagram is a diagram of a galaxy, and the outside of the rings contains everything else???

Explanation:

im sorry i tried i really dont know.

Answer:

the amount of atoms and particle I think is in here is 17 that oxygen and water can hold with the amount of barium hydrogen.

Answer:

CH4

Explanation:

It is a symmetrical molecule thus making it a non-polar molecule

Answer:

C. 8

Explanation:

The second shell can hold a maximum of eight electrons. When this is filled, electrons go into the third shell, which also holds a maximum of eight electrons. Then the fourth shell begins to fill. A lithium atom, for example, has three electrons.

Answer:

no it will take more time to boil

Answer:

Convection. Happens when air surrounding the heater is heated

Answer:

904.014 j/kgk

Explanation:

Mass of metal = 45g

Temperature of metal = 85.6°

Mass of water = 150

Temperature of water = 24.6

Final temperature of system = 28.3

Heat lost by metal = Heat gained by water

m1 * c1 * dt = m2 * c2 * dt

Q = quantity of heat

Q = m*c*dt

dt = change in temperature

dt of water = 28.3 - 24.6 = 3.7

dt of metal = 85.6 - 28.3 = 57.3

Specific heat capacity of water, c = 4200

(45 * 10^-3) * c * 57.3 = (150 * 10^-3) * 4200 * 3.7

2.5785c1 = 2331

c1 = 2331 / 2.5785

= 904.01396

= 904.014 j/kgk

Answer:

10 electrons.

Explanation:

Hello!

In this case, since a normal atom of magnesium has 12 protons and electrons when is not in the form of a cation, since it is a metal that tends to lose electrons when ionized, and therefore it becomes positively charged, we infer  that in form of:

[tex]Mg^{2+}[/tex]

It only has 10 electrons.

Best regards!

Answer:

3.02× 10²⁴ atoms

Explanation:

Given data:

Number of nitrogen atoms = ?

Number of moles of N₂O = 2.51 mol

Solution:

1 mole contain 2 mole of nitrogen atoms.

2.51 × 2 = 5.02  mol

According to Avogadro number,

1 mole = 6.022 × 10²³ atoms

5.02  mol ×  6.022 × 10²³ atoms / 1 mol

30.2 × 10²³ atoms

3.02× 10²⁴ atoms

Answer:

Glucose

Explanation:

This question is taken from a story that's on the internet titled "diagnosing Elisa".

Now, the diagnosis of Elisa found out that Elisa felt tired because her cells were not getting the daily amount of molecules they required from food and air and this made her cells not to function, grow & repair efficiently. In addition, the diagnoses further explained lack of molecules to mean that although that Elisa's cells were getting sufficient oxygen and amino acids molecules, but did not get sufficient glucose molecules.

Answer:

The new reading of the water level is 54.81 mL.

Explanation:

From the question given above, the following data were obtained:

Mass of object = 26.7 g

Density of object = 0.767 g/mL

Volume of water = 20 mL

New reading of the water level =?

Next, we shall determine the volume of the object. This can be obtained as follow:

Mass of object = 26.7 g

Density of object = 0.767 g/mL

Volume of object =?

Density = mass /volume

0.767 = 26.7 / volume of object

Cross multiply

0.767 × Volume of object = 26.7

Divide both side by 0.767

Volume of object = 26.7 / 0.767

Volume of object = 34.81 mL

Finally, we shall determine the new reading of the water level. This can be obtained as follow:

Volume of water = 20 mL

Volume of object = 34.81 mL

New reading of the water level =?

New reading of the water level = (Volume of water) + (Volume of object)

New reading = 20 + 34.81

New reading of the water level = 54.81 mL

Reactions in our natural world range from classical chemical reactions to nuclear reactions.

A classical chemical reaction is a natural process that occur when one or more elements called reactants change to form one or more products.

Chemical reactions can be speed up by the action of enzymes, which are biological catalysts capable of lowering the activation energy of the reactions.

On the other hand, nuclear reactions occur when atoms react among them to generate new elements.

Nuclear reactions can be classified into fusion reactions where atomic nuclei fuse and fusion reactions where an atomic nucleus gives rise to two different atoms.

In conclusion, Reactions in our natural world range from classical chemical reactions to nuclear reactions.

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Answer:

Argument: It is not Safe

Further support to the argument is given below.

Explanation:

Solution:

Argument: It is not Safe

First of all, we all know the ideal gas law:

PV = nRT

And the Boyle's Law states that , if the pressure is increased then, volume will decrease. and if the volume is increased then pressure will decrease.

V is inversely proportional to Pressure of the gas.

So, in this case, Let's suppose we have toxic solution of methyl alcohol in the bottle which is tightly closed. It means pressure in the bottle is high, hence the volume is less.

If in this scenario someone, leave the bottle open in the laboratory and as it is given that the level of solution will drastically decrease. It means it is volatile in nature and is converted into gaseous form and we know now that the open bottle has now less pressure. Hence the volume of the gas will be higher and now it can spread to every corner of the laboratory. And it is very dangerous.

Answer:

Ice is less dense than water.

Answer:

b

Explanation:

Answer:

2Mg + O2 -> 2MgO

Explanation:

According to the above reaction ,

28.6g(2mole) Mg combine with 32g (1mole) of O2 to give 80.6g (2 mole) of MgO.

thus,

30g Mg will combine with 20g of O2 to produce 50g MgO and 10gO2 will remain unreactive.

I hope it's helpful!

Answer:

Mass = 51 g

Explanation:

Given data:

Mass of nitrogen = 41.93 g

Mass of ammonia formed = ?

Solution:

Chemical equation:

N₂ + 3H₂      →       2NH₃

Number of moles of nitrogen:

Number of moles = mass/molar mass

Number of moles = 41.93 g/ 28 g/mol

Number of moles = 1.5 mol

now we will compare the moles of nitrogen and ammonia.

                N₂          :           NH₃

                  1          :           2

                1.5         :         2/1×1.5 = 3 mol

Mass of ammonia formed:

Mass = number of moles × molar mass

Mass = 3 mol × 17 g/mol

Mass = 51 g

Explanation:

The partial pressure of an individual gas is equal to the total pressure of the mixture multiplied by the mole fraction of the gas.

Total pressure = 2atm

Mole Fraction = number of moles / total number of moles

Neon

Mole Fraction = 4.46 / 7.35 = 0.607

Partial Pressure = 0.607 * 2 = 1.214 atm

Argon

Mole Fraction = 0.74 / 7.35 = 0.101

Partial Pressure = 0.101 * 2 = 0.202 atm

Xenon

Mole Fraction = 2.15 / 7.35 = 0.293

Partial Pressure = 0.293 * 2 = 0.586 atm

Answer:

Hi I ll explain

Explanation:

[tex]0.4mol \times \frac{22.4liter}{1mol} = 8.96liter[/tex]

Remember

At STP always one mole of every gas equals 22.4 liter

Answer:

4.50 L

Explanation:

First we calculate how many moles are there in 3.84 L of a 8.50 mol/L solution:

Now, keeping in mind that

we can calculate the volume of a 7.25 mol/L solution that would contain 32.64 moles:

So we could take 4.50 L of the 7.25 mol/L solution and evaporate the solvent until only 3.84 L remain.

Answer:a multiplication

Explanation:

In a dilation, multiplication is the mathematical operation which is used with the scale factor. Thus, the correct option is A.

Dilation is a process of changing the size or the shape of an object by decreasing or increasing its dimensions by some scaling factors.

In mathematics, dilation is a function (f) from a metric space (M) into itself which satisfies the identity (d=rd) for all points x, y \in M, where d is the distance from the points x to y and r is some positive real number. In this, the mathematical operation which is used is multiplication.

Therefore, the correct option is A.

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Answer:

Pb

Explanation:

Answer:

Pb is the answer You're looking for

Answer:

0.53

Explanation:

A solution is made by mixing 42 g of chloroform (CHCl₃) and 31 g of heptane (C₇H₁₆). Calculate the mole fraction of chloroform in this solution. Be sure your answer has the correct number of significant digits.

Step 1: Calculate the number of moles of chloroform

The molar mass of CHCl₃ is 119.38 g/mol.

42 g × 1 mol/119.38 g = 0.35 mol

Step 2: Calculate the number of moles of heptane

The molar mass of C₇H₁₆ is 100.20 g/mol.

31 g × 1 mol/100.20 g = 0.31 mol

Step 3: Calculate the total number of moles

We will use the following expression.

n = nCHCl₃ + nC₇H₁₆ = 0.35 mol + 0.31 mol = 0.66 mol

Step 4: Calculate the mole fraction of chloroform

We will use the following expression.

χ(CHCl₃) = nCHCl₃ / n

χ(CHCl₃) = 0.35 mol / 0.66 mol = 0.53

Answer:23.9 g

Explanation:

Grams C = (12/6.02214076)*12 = 23.9 g

There are 23.9 grams of carbon are in [tex]12*10^{23}[/tex] atoms of carbon.

As we know that, atomic mass of carbon is 12.

It means that, In one mole of carbon , 12 grams of carbon is present.

    1 mole [tex]=6.022*10^{23} atoms[/tex]

In [tex]6.022*10^{23}[/tex] atoms of carbon, 12 grams of carbon is present.

So,  In [tex]12*10^{23}[/tex] atoms of carbon,

                                 [tex]=\frac{12}{6.022*10^{23} }*6*10^{23}\\\\=23.9 grams[/tex]

There are 23.9 grams of carbon are in [tex]12*10^{23}[/tex] atoms of carbon.

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Answer:

B.

Explanation:

Weather changes daily and varies in different areas around the world

Answer: The mass of sodium bromide dihydrate is 0.208 grams

Explanation:

Molarity of a solution is defined as the number of moles of solute dissolved per liter of the solution.

[tex]Molarity=\frac{n\times 1000}{V_s}[/tex]

where,

n = moles of solute

[tex]V_s[/tex] = volume of solution in ml  = 250 ml

moles of [tex]NaBr.2H_2O[/tex] = [tex]\frac{\text {given mass}}{\text {Molar mass}}=\frac{xg}{138.92g/mol}[/tex]

Now put all the given values in the formula of molality, we get

[tex]0.00600=\frac{x\times 1000}{138.92\times 250}[/tex]

[tex]x=0.208[/tex]

Therefore, the mass of sodium bromide dihydrate is 0.208 grams

the second option is best described

Explanation:

.