What is the molarity of 62grams of ammonium in 5liters of water?

The wavelength of a wave can be found by measuring how high the wave is measuring how many waves pass a point in a second measur

Liono4ka [1.6K]

Now that you know something about the properties of the two main types of waves (Lesson 43), we need to make sure that you can look at individual characteristics that waves can have.

Not all waves are created equal!You need to be able to see the specific “faces” that each wave can have, based on three important characteristics: frequency, wavelength, and amplitude.Frequency

When we first started looking at SHM we defined period as the amount of time it takes for one cycle to complete... seconds per cycle

Frequency is the same sort of idea, except we’re just going to flip things around.Frequency is a measurement of how many cycles can happen in a certain amount of time… cycles per second.If a motor is running so that it completes 50 revolutions in one second, I would say that it has a frequency of 50 Hertz.Hertz is the unit of frequency, and just means how many cycles per second.It is abbreviated as Hz.It is named after Heinrich Hertz, one member of the Hertz family that made many important contributions to physics.In formulas frequency appears as an "f".

Since frequency and period are exact inverses of each other, there is a very basic pair of formulas you can use to calculate one if you know the other…

It is very easy to do these calculations on calculators using the x-1 button.

Example 1: The period of a pendulum is 4.5s. Determine the frequency of this pendulum.

The period means that it will take 4.5 seconds for the pendulum to swing back and forth once. So, I expect that my frequency will be a decimal, since it will complete a fraction of a swing per second.Wavelength

Wavelength is a property of a wave that most people (once they know what to look for) can spot quickly and easily, and use it as a way of telling waves apart. Look at the following diagram...

Figure 1Any of the parts of the wave that are pointing up like mountains are called crests. Any part that is sloping down like a valley is a trough.Wavelength is defined as the distance from a particular height on the wave to the next spot on the wave where it is at the same height and going in the same direction.Usually it is measured in metres, just like any length.There isn’t a special spot you have to start on a wave to measure wavelength, just make sure you are back to the same height going in the same direction. Most people do like to measure from one crest to the next crest (or trough to trough), just because they are easy to spot.Figure 2

On a longitudinal wave, the wavelength is measured as the distance between the middles of two compressions, or the middles of two expansions.

Figure 3

This leads us to one of the most important formulas you will use when studying waves.

Frequency tells us how many waves are passing a point per second, the inverse of time.Wavelength tells us the length of those waves in metres, almost like a displacement.If we multiply these two together, we are really multiplying 1/s and m… which gives us m/s, the velocity of the wave!

v = velocity of the wave (m/s)
f = frequency (Hz)
λ = wavelength (m)

Example 2: A wave is measured to have a frequency of 60Hz. If its wavelength is 24cm, determine how fast it is moving.

Example 3: The speed of light is always 3.00e8 m/s. Determine the frequency of red light which has a wavelength of 700nm.

Be careful when changing the 700nm into metres. Some people get really caught up with changing it into regular scientific notation with only one digit before the decimal. Why bother? It's only being used in a calculation. You’ll probably just make a mistake changing the power of 10, so just substitute in the power for the prefix and leave everything else alone…700 nm = 700 x 10-9 m since “nano” is 10-9.

Amplitude

Amplitude is a measure of how big the wave is.

Imagine a wave in the ocean. It could be a little ripple or a giant tsunami.What you are actually seeing are waves with different amplitudes.They might have the exact same frequency and wavelength, but the amplitudes of the waves can be very different.

The amplitude of a wave is measured as:

the height from the equilibrium point to the highest point of a crest orthe depth from the equilibrium point to the lowest point of a troughFigure 4

When you measure the amplitude of a wave, you are really looking at the energy of the wave.

It takes more energy to make a bigger amplitude wave.Anytime you need to remember this, just think of a home stereo’s amplifier… it makes the amplitude of the waves bigger by using more electrical energy.

6 0

3 years ago

Sodium carbonate reacts with silver nitrate according to the following balanced equation: Na2CO3 (s) + 2 AgNO3 (aq) → Ag2CO3 (s)

klemol [59]

Answer:

a) 2.01 g

Explanation:

Na₂CO₃ (s) + 2AgNO₃ (aq) → Ag₂CO₃ (s) + 2NaNO₃

First we convert 0.0302 mol AgNO₃ to Na₂CO₃ moles, in order to calculate how many Na₂CO₃ moles reacted:

0.0302 mol AgNO₃ * $\frac{1molNa_2CO_3}{2molAgNO_3}$ = 0.0151 mol Na₂CO₃

So the remaining Na₂CO₃ moles are:

0.0340 - 0.0151 = 0.0189 moles Na₂CO₃

Finally we convert Na₂CO₃ moles into grams, using its molar mass:

0.0189 moles Na₂CO₃ * 106 g/mol = 2.003 g Na₂CO₃

The closest answer is option a).

8 0

3 years ago

A student is investigating the effect of concentration on the colour of a solution of copper sulfate.She wished to make up 250cm

IrinaK [193]

Answer:

79.8g/dm³

Explanation:

As you can see, the solution in the problem contains 0.5 moles of copper sulfate per dm³. To solve this question we must convert these moles to grams using its molar mass (Molar mass CuSO4 = 159.609g/mol) as follows:

0.5mol CuSO4/dm³ * (159.609g/mol) =

3 0

3 years ago

What is the base metric unit for measuring volume?

uranmaximum [27]

I got this idk if it's correct: For measuring large distances, the kilometer (103 or 1000 meters) is often used. The basic unit of volume in the metric system is the liter (l). The most common derived unit is the milliliter (ml) (10-3 or 1/1000 of a liter). The volume of a milliliter is equal to the volume of a cube 1 centimeter per side.

5 0

3 years ago

Which of the following steps correctly describes the preparation of 0.5 M solution of FeCl3?

Marizza181 [45]

Answer:

Option A is correct

Explanation:

Data given:

Steps for preparation of 0.5 M solution = ?

Solution:

Molarity: This the term used for the concentration of the solution. It is the amount of solute in moles dissolve in 1 Liter of solution.

Formula used for Molarity

Molarity = number of moles of solute / 1 L of solution

From the above definition and formula it is clear that we have to know the following things.

no. of moles of f the solute

we also should know that of what concentration we are preparing solution in terms of molarity
The total amount of should be in liter of solution not solvent separately

Now:

As we couldn't weight mole on balance so have to convert moles to grams by using molar mass or mass in grams formula

As

1 mole = mass in grams / molar mass

so to convert mole to mass rearrange the above equation

mass in grams = 1 mole x molar mass

So,

1 mole of any substance equal to its molar mass

Now, to prepare 0.5 M solution of FeCl₃

First we find molar mass and weigh it

So,

1 mole of FeCl₃ = molar mass of FeCl₃

for 0.5 M

Multiply the molar mass with 0.5

To make 1 L of solution

As we know that molarity is the amount of solution in liter of solution not solvent, so we add the calculated amount of solute in volumetric flask and then add water till the 1 L mark. that is amount of solute plus solvent combined form 1 L of Solution.

So, Option A is correct: Find the molar mass of FeCl3 and multiply by 0.5 to find the amount. Add this amount in a volumetric flask and add water till the 1 L mark

3 0

3 years ago