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3 years ago

A student has an unknown sample. How can spectroscopy be used to identify the sample?

2 answers:

4 0

Every substance has a unique interaction or response to an electromagnetic radiation. He can use spectroscopy by looking at the response of the unknown sample to an electromagnetic radiation. Spectroscopy is <span>is the study of the interaction between matter and electromagnetic radiation. </span>

DiKsa [7]3 years ago

4 0

the answer is A!!!!!!!

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jenyasd209 [6]

Depending on genetics. the fathers genes depend on everything because they give most of the heredity and genetics to the child, more than the mother does.
like how the chlids sex is depended on the given fathers heredity and genetics.

4 0

3 years ago

Name the precipitate that forms when aqueous solutions of barium nitrate and potassium sulfate are mixed.

IrinaVladis [17]

Answer:

barium sulfate BaSO₄

Explanation:

When aqueous solutions of barium nitrate and pottasion sulfate are mixed, a precipitate of barium sulfate BaSO₄ forms.

3 0

3 years ago

Specify which atoms, if any, bear a formal charge in the Lewis structure given and the net charge for the species. Be sure to an

Viefleur [7K]

This is an incomplete question, here is a complete question.

Specify which atoms, if any, bear a formal charge in the Lewis structure given and the net charge for the species. Be sure to answer all parts.

$:C\equiv N:$

a. Formal charge C:___________.

b. Formal charge N:________.

d. Net charge:________.

Answer :

a. Formal charge C : (-1) charge

b. Formal charge N : (0) charge

d. Net charge : (-1) charge

Explanation :

Lewis-dot structure : It shows the bonding between the atoms of a molecule and it also shows the unpaired electrons present in the molecule.

In the Lewis-dot structure the valance electrons are shown by 'dot'.

The given molecule is, $CN^-$

As we know that carbon has '4' valence electrons and nitrogen has '5' valence electrons.

Therefore, the total number of valence electrons in $CN^-$ = 4 + 5 + 1 = 10

According to Lewis-dot structure, there are 6 number of bonding electrons and 4 number of non-bonding electrons.

Now we have to determine the formal charge for each atom.

Formula for formal charge :

$\text{Formal charge on C}=4-2-\frac{6}{2}=-1$

$\text{Formal charge on N}=5-2-\frac{6}{2}=0$

Thus, the net charge will be = -1 + 0 = -1

3 0

3 years ago

A 10.0 mL sample of 0.75 M CH3CH2COOH(aq) is titrated with 0.30 M NaOH(aq) (adding NaOH to CH3CH2COOH). Determine which region o

Llana [10]

Answer:

5.75

Explanation:

Weak acid and strong base,

Make it a two part problem

The first will be Partial neutralization of the weak acid, while the second is the equilibrium and final pH

1.Parameters

HC2H3O2 =10mL x 0.75M = 7.5 mmol

NaOH =22mL x 0.30M = 6.6 mmol

R HC2H3O2 + OH- --> C2H3O2- + H2O

I 7.5 mmol 6.6 mmol 0 mmol ignore

C -6.6 mmol -6.6 mmol +6.6 mmol

E 0.9 mmol 0.0 mmol 6.6 mmol

2.) HC2H3O2 --> H+ + C2H3O2-

Initial concentrations

[HC2H3O2]: 0.9 mmol / 32mL = 0.0281M

[H+]:

[C2H3O2-]: 6.6 mmol x 32mL = 0.206M

Concentrations at equilibrium

[HC2H3O2]: 0.0281M - x

[H+]: [C2H3O2-]: 0.206M + x

If x is small and can be ignored except [H+]

Substitute and solve

1.3 x 10-5 = (x)(0.206)

(0.0281)

X= 1.77 x 10-6M => pH = 5.75

3 0

3 years ago

210.0 °C a gas has a volume of 8.00 L. What is the volume of this gas at -23.0°C?

Firlakuza [10]

You will need to use Charles Law. Volume1/Temperature1 = Volume2/Temperature2 Note all temperatures must be in Kelvin. You can convert Celsius to Kelvin by adding 273. Then plug in and solve . You should get 4.14L

5 0

3 years ago