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sukhopar [10]
3 years ago
8

Changes in which two characteristics can indicate a physical change?

Chemistry
2 answers:
liberstina [14]3 years ago
6 0

Answer:

A-Shape

C-state

Explanation:

reactivity and flammability are both indicators of chemicals changes

noname [10]3 years ago
5 0

Answer:

A. and C.

Explanation:

A P E X

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Mistry- Unit 5 Test 1 33 of 50
vodka [1.7K]

Answer:

∆H fus = -∆H solid

Explanation:

Enthalpy of melting (fusion) is the enthalpy change when a substance melts. It is always endothermic (i.e heat is being absorbed). So ∆H is positive.

Enthalpy of freezing (solidification) is the enthalpy change when a substance freezes. It is negative that of melting.

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The pressure on 30 milliliters of an ideal gas increases from
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V1 = 30 mL

P1 = 760 torr

P2 = 1520 torr

V2 = ?

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760 torr * 30 mL = 1520 torr * V2

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Answer:

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(b) NO - Nitrogen monoxide or Nitrogen (II) oxide

(c) NO₂ - Nitrogen dioxide or Nitrogen (IV) oxide

(d) N₂O₅ - Dinitrogen pentoxide

(e) N₂O₄ - Dinitrogen tetraoxide.

Explanation:

To name each of the compounds,

(a) N2O; It is properly written as N₂O. N₂O is a colorless, sweet tasting gas also known as "laughing gas".

N₂O - Dinitrogen monoxide OR Dinitrogen (I) oxide.

(b) NO; NO is a colorless gas.

NO - Nitrogen monoxide OR Nitrogen (II) oxide.

(c) NO2; It is properly written as NO₂

NO₂ is a reddish-brown gas.

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(d) N2O5; It is properly written as N₂O₅

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N₂O₅ - Dinitrogen pentoxide.

(e) N2O4; It is properly written as N₂O₄;

N₂O₄ is a red-brown liquid with an unpleasant smell.

N₂O₄ - Dinitrogen tetraoxide.

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