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Lelechka [254]
3 years ago
14

The phase of matter can be changed by:

Chemistry
2 answers:
777dan777 [17]3 years ago
7 0
The phases of matter are changed by temperature and pressure
kari74 [83]3 years ago
3 0

Answer : The phase of matter can be changed by pressure and temperature.

Explanation :

As we know that there are three states of matter which are solid, liquid and gaseous state.

Solid state : In this state, the molecules are arranged in regular and repeating pattern and are closely packed that means they are fixed and vibrate in place but they can not move from one place to another.

Liquid state : In this state, the molecules are present in random and irregular pattern and are closely packed but they can move from one place to another.

Gaseous state : In this state, the molecules are present in irregular pattern and are not closely packed and they can move freely from one place to another and spread out.

From this we conclude that, the arrangements of all the phase of matter can be changed by applying the pressure and temperature. That means,

By applying the pressure and temperature, the solid phase can be changed into liquid or gaseous state or liquid into solid or gaseous or gas into liquid or solid.

Hence, the phase of matter can be changed by pressure and temperature.

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Answer: A convex lens is used to converge ligtht.

Explanation:

A concave lens is a lens that is thicker on the ends than in the middle. As consequence of this, a concave lens diverges (separate) the rays of light. A concave lens is also called diverging lens.

A convex lens is is thicker in the middle than on the ends. As consequence of this, a convex lense converge the parallel rays that pass through it. A convex lens is also called converging lens.
4 0
3 years ago
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lora16 [44]

Answer: Please see answer below

Explanation:

Mecury vapor lamp is better to use than Sodium vapor light, this is because  because

---The Filaments of the lamp in sodium  emit fast moving electrons, which causes valence electrons of the sodium atoms to excite to higher energy levels which when electrons after being excited, relax by emitting yellow light which concentrates on the the  monochromatic bright yellow part of the visible spectrum which is about  580-590 or about (589nm) which will fall incident on the calibrations making it difficult to see

While

In Mercury vapor lamp, The emitted  electrons from the filaments, after having been excited  by high voltage, hit the mercury atoms but the excited electrons of mercury atoms relax and emits an  ultraviolet  uv invisible lights falling on the mecury vapour lamp to produce white light  covering  a wide range of  (380-780 nm) which is visible that is why it is used for calibrations purposes in  lightening applications.

7 0
3 years ago
8.43g of CaCl2·2H2O is dissolved in 40.0g of H2O. What is the molality of the solution? (Note that the H2O in the CaCl2·2H2O mus
lara31 [8.8K]

Answer:

[CaCl₂·2H₂O] = 1.43 m

Explanation:

Molality is mol of solute / kg of solvent.

Mass of solvent = 40 g

Let's convert g to kg → 40 g / 1000 = 0.04 kg

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8.43 g / 146.98 g/mol = 0.057 mol

Molality = 0.057 mol / 0.04 kg → 1.43

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3 years ago
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SashulF [63]

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DerKrebs [107]

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22.46

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