Ask question

Ask question

All categories

3 years ago

5

4. Two liquids at the same temperature are mixed together. You

2 answers:

irakobra [83]3 years ago

6 0

Answer:

Check temp change

Explanation:

Never taste

Diano4ka-milaya [45]3 years ago

5 0

Answer:

I would say you would check for temperature change. A chemical reaction is shown by a change in color, a change in temperature, solids forming, odor, or smoke. So check temperature.

edit: while odor is an option in the answer. i think temp is a better choice.

You might be interested in

Calculate the standard free energy for the following reaction at 25Â°C.

sladkih [1.3K]

I dont think with this much amount of information we can solve this...unless its an reversible reaction in that case free energy =0

3 0

3 years ago

What is the volume of 9.5 g fluorine gas, F2, at STP?

Tju [1.3M]

Answer:

5.6L

Explanation:

At STP, the pressure and temperature of an ideal gas is

P = 1 atm

T = 273.15k

Volume =?

Mass = 9.5g

From ideal gas equation,

PV = nRT

P = pressure

V = volume

n = number of moles

R = ideal gas constant =0.082J/mol.K

T = temperature of the ideal gas

Number of moles = mass / molar mass

Molar mass of F2 = 37.99g/mol

Number of moles = mass / molar mass

Number of moles = 9.5 / 37.99

Number of moles = 0.25moles

PV = nRT

V = nRT/ P

V = (0.25 × 0.082 × 273.15) / 1

V = 5.599L = 5.6L

The volume of the gas is 5.6L

5 0

3 years ago

Give the symbol for the atom that corresponds to each electron configuration:

stepan [7]

Answer:

Na

N

Si

O

K

Ti

Explanation:

To know what symbol corresponds to the electron configurations, we just have to count the number of electrons.

⇒1s² 2s² 2p6 3s1

This means there are 2 electrons on the first shell

8 electrons on the second shell

and 1 electron on the third shell

in total there are 11 electrons ⇒ this means the atom number is 11

If we look at the periodic table to atom number 11 we'll see that this is Sodium (Na).

⇒ 1s² 2s² 2p³

This means there are 2 electrons on the first shell

and 5 electrons on the second shell

So 7 electrons in total ⇒ this means the atom has atom number 7

⇒Nitrogen (N)

⇒ 1s² 2s² 2p6 3s² 3p²

This means there are 2 electrons on the first shell

There are 8 electrons on the second shell

There are 4 electrons on the third shell

So there are 14 electrons in total ⇒ atom number 14

⇒Silicon (Si)

⇒1s² 2s² 2p4

This means there are 2 electrons on the first shell

There are 6 electrons on the second shell

8 electrons in total ⇒ atom number = 8

⇒Oxygen (O)

⇒ 1s² 2s² 2p6 3s² 3p6 4s1

This means there are 2 electrons on the first shell

There are 8 electrons on the second shell

There are 8 electrons on the third shell

There is 1 electron on the fourth shell

This means there are 19 electrons in total ⇒ atom number 19

⇒Potassium (K)

⇒ 1s² 2s² 2p6 3s² 3p6 3d² 4s²

This means that 2 electrons on the first shell

There are 8 electrons on the second shell

There are 10 electrons on the third shell

there are 2 electrons on the fourth shell

There are 22 electrons in total ⇒ atom number 22

⇒ Titanium (Ti)

4 0

3 years ago

A 1.93-mol sample of xenon gas is maintained in a 0.805-L container at 306 K. Calculate the pressure of the gas using both the i

Alex

Answer : The pressure of the gas using both the ideal gas law and the van der Waals equation is, 60.2 atm and 44.6 atm respectively.

Explanation :

First we have to calculate the pressure of gas by using ideal gas equation.

$PV=nRT$

where,

P = Pressure of $Xe$ gas = ?

V = Volume of $Xe$ gas = 0.805 L

n = number of moles $Xe$ = 1.93 mole

R = Gas constant = $0.0821L.atm/mol.K$

T = Temperature of $Xe$ gas = 306 K

Now put all the given values in above equation, we get:

$P\times 0.805L=1.93mole\times (0.0821L.atm/mol.K)\times 306K$

$P=60.2atm$

Now we have to calculate the pressure of gas by using van der Waals equation.

$(P+\frac{an^2}{V^2})(V-nb)=nRT$

P = Pressure of $Xe$ gas = ?

V = Volume of $Xe$ gas = 0.805 L

n = number of moles $Xe$ = 1.93 mole

R = Gas constant = $0.0821L.atm/mol.K$

T = Temperature of $Xe$ gas = 306 K

a = pressure constant = $4.19L^2atm/mol^2$

b = volume constant = $5.11\times 10^{-2}L/mol$

Now put all the given values in above equation, we get:

$(P+\frac{(4.19L^2atm/mol^2)\times (1.93mole)^2}{(0.805L)^2})[0.805L-(1.93mole)\times (5.11\times 10^{-2}L/mol)]=1.93mole\times (0.0821L.atm/mol.K)\times 306K$

$P=44.6atm$

Therefore, the pressure of the gas using both the ideal gas law and the van der Waals equation is, 60.2 atm and 44.6 atm respectively.

5 0

3 years ago

Can someone plz help me on question 3 I really need help plz

zavuch27 [327]

1. <em>Describe</em>

Frequency (f) and wavelength (λ) are inversely related.

f ∝ 1/λ

As one goes up, the other goes down and vice versa.

2. <em>Infer </em>

The frequency of infrared light is less than that of red light, so infra could mean something like less than or below or beneath.

Ultrahigh frequencies are extremely high compared with those of visible light. Ultrasound has frequencies that are far beyond what we can hear. An ultracentrifuge goes at extremely high speed, and an ultramicroscope can “see” tiny structures. Ultra could probably mean something like extremely or far beyond.

3. <em>Analyze </em>

Energy is directly proportional to frequency (E ∝ f).

Frequency is inversely proportional to wavelength (f ∝ 1/λ).

Energy is inversely proportional to wavelength (E ∝ 1/λ).

5 0

4 years ago