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3 years ago

Is motor oil a pure substance or a mixture?

Chemistry

1 answer:

xxTIMURxx [149]3 years ago

7 0

Answer:

it's a mixture

Explanation:

I literally just went on Google google and type that in. if you're in highschool I got some links for you I got some alot of helpful websites with math, science, social science, and highschool year of course, biology, geometry, Algerbra, and any other class you're taking. if you don't want them just type no.

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What is the name of Se2Cl7?

Monica [59]

Answer:

diselenium heptachloride

Explanation:

Se2Cl7

Se = selenium

Cl = chlorine

Don't forget the "-ide"

Diselenium heptachloride

4 0

4 years ago

True or false energy has no mass and takes up no space

ivanzaharov [21]

Answer:

False

Explanation:

Energy takes up space as mass is a form of energy and energy is always constant.

4 0

4 years ago

How many atoms are in 14.3 Liters of oxygen?

kramer

Answer: 3.84 x 10^23

8 0

4 years ago

In the reaction C + O2 → CO2, 18 g of carbon react with oxygen to produce 72 g of carbon dioxide. What mass of oxygen would be n

artcher [175]

Stoichiomety:

1 moles of C + 1 mol of O2 = 1 mol of CO2

multiply each # of moles times the atomic molar mass of the compund to find the relation is weights

Atomic or molar weights:

C: 12 g/mol
O2: 2 * 16 g/mol = 32 g/mol
CO2 = 12 g/mol + 2* 16 g/mol = 44 g/mol

Stoichiometry:

12 g of C react with 32 g of O2 to produce 44 g of CO2

Then 18 g of C will react with: 18 * 32/ 12 g of Oxygen = 48 g of Oxygen

And the result will be 12 g of C + 48 g of O2 = 60 g of CO2.

You cannot obtain 72 g of CO2 from 18 g of C.

May be they just pretended that you use the law of consrvation of mass and say that you need 72 g - 18g = 54 g. But it violates the proportion of C and O2 in the CO2 and is not possible.

3 0

4 years ago

Read 2 more answers

A hydrogen atom with its electron in the n = 6 energy level emits a photon of IR light. Calculate (a) the change in energy of th

geniusboy [140]

Answer:

(a) The change in energy of the atom is --6.0528 X 10⁻²⁰ J

(b) The wavelength of the photon is 32841 Å

Explanation:

E = -kz²/n²

Where;

E is the change in the energy of the atom

k is a constant = 2.179 X 10¹⁸ J

z is the atomic number of hydrogen = 1

n = 6

E = -(1 X 2.179 X 10⁻¹⁸ )/6²

E = -6.0528 X 10⁻²⁰ J

Therefore,the change in energy of the atom is -6.0528 X 10⁻²⁰ J

(b) the wavelength (in Å) of the photon, can be calculated as follows;

E = hc/λ

λ = hc/E

where;

h is Planck's constant = 6.626 X 10⁻³⁴ js

c is the speed of light = 3 X 10⁸ m/s

λ is the wavelength of the photon

λ = (6.626 X 10⁻³⁴ X 3 X 10⁸ )/(6.0528 X 10⁻²⁰)

λ = 3.2841 X 10⁻⁶ m

λ = 32841 Å

Therefore, the wavelength of the photon is 32841 Å

3 0

3 years ago