1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Marat540 [252]
4 years ago
6

Which of these is an example of a physical change ?

Chemistry
1 answer:
Gre4nikov [31]4 years ago
8 0
It's 1. Melting a substance. The rest are chemical changes
You might be interested in
In a resonant hybrid of a molecule like CH3CO2-, how are the electron orbitals of the carbon in CO2 sp hybridized?
Burka [1]
<span>The carbon  sp2 is hybridized  in any cabozxylic acid oninon and it forms one simga bond with each oxygine and one sigma bond with carbon backbone.</span>
7 0
3 years ago
En condiciones normales 1g de aire ocupa un volumen de 773 mL ¿ qué volumen ocupará la misma masa de aire a 0 ºC y la presión a
emmainna [20.7K]

Answer:

El volumen que ocupará la misma masa de aire es 839.49 mL.

Explanation:

Las condiciones normales de presión y temperatura (abreviado CNPT) o presión y temperatura normales (abreviado PTN o TPN), son términos que implican que la temperatura referenciada es de 0ºC (273,15 K) y la presión de 1 atm (definida como 101.325 Pa).

La ley de Boyle dice que “El volumen ocupado por una determinada masa gaseosa a temperatura constante, es inversamente proporcional a la presión”  y se matemáticamente como

Presión*Volumen=constante

o P*V=k

La ley de Charles es una ley que dice que cuando la cantidad de gas y de presión se mantienen constantes, el cociente que existe entre el volumen y la temperatura siempre tendrán el mismo valor:  

\frac{V}{T} =k

La ley de Gay-Lussac​ establece que la presión de un volumen fijo de un gas, es directamente proporcional a su temperatura. Se expresa matemáticamente como:

\frac{P}{T} =k

Combinando estas tres leyes se obtiene:

\frac{P*V}{T} =k

Siendo un estado inicial 1 y un estado final 2, la expresión anterior queda determinada como:

\frac{P1*V1}{T1} =\frac{P2*V2}{T2}

En este caso:

  • P1=  101325 Pa
  • V1= 773 mL
  • T1= 273.15 K
  • P2= 93,3 kPa= 93300 Pa
  • V2= ?
  • T2= 0°C= 273.15 K

Reemplazando:

\frac{101325 Pa*773 mL}{273,15 K} =\frac{93300 Pa*V2}{273.15 K}

y resolviendo obtenes:

V2=\frac{273.15 K}{93300 Pa} *\frac{101325 Pa*773 mL}{273,15 K}

V2= 839,49 mL

<u><em>El volumen que ocupará la misma masa de aire es 839.49 mL.</em></u>

8 0
3 years ago
How glycerin is form?
Alex787 [66]
Glycerin is a sugar alcohol derived from animal products, plants or petroleum. ... Vegetable glycerin is made by heating triglyceride-rich vegetable fats — such as palm, soy and coconut oils — under pressure or together with a strong alkali, such as lye.
6 0
3 years ago
Hawaii, which sits over a hot spot located near the center of the Pacific
inysia [295]
The person on top is very correct have a beautiful lovely day:)
6 0
3 years ago
Do liquids expand when they freeze
Oksana_A [137]

Answer:

most liquids do expand when they freeze

Explanation:

water is actually one that expands and there are probably many more too

i hope this helps you

8 0
3 years ago
Other questions:
  • !!Help!!Polysaccharides are healthier for the body than mono- or disaccharides are. What choices could you make to increase your
    12·1 answer
  • Why are the levels at the top smaller and the ones on the bottom larger in the energy pyramid? HELP ASAP
    10·1 answer
  • When a radioactive isotope releases an alpha particle, the atomic number of the atom is
    15·1 answer
  • The spontaneous decay of an atom is called
    12·2 answers
  • What is the independent variable?​
    12·2 answers
  • You are investigating an organic compound. You discover that it contains a C=O bond and an —OH group. What property would it exh
    11·2 answers
  • In the Dumas Method, the volatile sample
    12·1 answer
  • A negative ion is (larger/smaller) than its parent atom.<br> Why?
    13·1 answer
  • NEED ASAP. WILL MARK BRAINLIEST!
    8·2 answers
  • How many moles of nacl are required to make 500. 0 ml of a 0. 1 m solution of nacl?.
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!