What are the phase change processes taking place when a substance is in equilibrium between liquid and gas phases? A. Melting and boiling B. Expanding and contracting C. Evaporating and condensing D. Freezing and thawing

Answers

Answer 1

Answer:

Answer: C. Evaporating and condensing

Explanation: Phase change process id the process in which the phase of one substance is transforming into the another.

These chemical process of transformation can takes place under dynamic equilibrium in which conversion of one phase is in equilibrium with the another one.

In this liquid phase is transforming into the gas phase which is known as Evaporation and gaseous phase is converting back into the liquid phase which is known as Condensation.

Answer 2

Answer: C. Evaporating and condensing. When the liquid becomes gas is called evaporation. When gas become liquid it's condensation.

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If a solid piece of naphthalene is heated and remains at 80 degrees C until is is completely melted, you know that 80 is the what?

Answers

Answer: The given temperature is known as melting point of naphthalene.

Explanation:

Melting point is defined as the temperature at which solid gets converted to liquid.

The temperature remains constant until all the solid has been converted to liquid. At this temperature, solid state and liquid state are present at equilibrium.

$\text{Solid state}\rightleftharpoons \text{Liquid state}$

We are given:

A solid piece of naphthalene is heated till 80°C until all the solid is melted.

Hence, the given temperature is known as melting point of naphthalene.

If a solid piece of naphthalene is heated and remains at 80 degrees Celsius until it is completely melted, you know that 80 degrees Celsius is the melting point of the solid naphthalene. This is the maximum temperature at which the chromium is in its solid form.

The molar mass of copper(II) chloride (CuCl2) is 134.45 g/mol. How many formula units of CuCl2 are present in 17.6 g of CuCl2? 7.88 × 1022 formula units 1.84 × 1023 formula units 1.91 × 1023 formula units 1.42 × 1024 formula units

Answers

7.88 10^22 formula units

The answer is,

A. 7.88 × 1022 formula units

Calculate the energy in joules and calories required to heat 25.0 g of water from 12.5C to 25.7C

Answers

the heat (Q) required to raise the temp of a substance is:Q=m∗Cp∗ΔT where m is the mass of the object (25.0g in this case), Cp is the specific heat capacity of the substance (for water Cp = 1.00cal/gC, or 4.18J/gC,
and Dt is the change in temp.
You'll have to solve this twice, once with the Cp in calories, and once with the Cp in joules.
1380.72 Joules

If a cell is placed in salt water, water leaves the cell by _____. A. Osmosis
B. Diffusion
C. Active transport
D. Phagocytosis

Answers

The correct answer to fill the blank in the sentence is A. If a cell is placed in salt water, water leaves the cell by osmosis. It is the spontaneous movement of solvent molecules in a semi-permeable membrane from a higher concentration to lower concentration to achieve equilibrium.

Final answer:

Water leaves the cell by osmosis when placed in salt water.

Explanation:

When a cell is placed in salt water, water leaves the cell by osmosis. Osmosis is the movement of water molecules across a semi-permeable membrane from an area of lower solute concentration to an area of higher solute concentration.

Learn more about Osmosis here:

brainly.com/question/33306139

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Which of these compounds has chemical properties most similar to the chemical properties of ethanoic acid?(1) C3H7COOH (3) C2H5COOC2H5(2) C2H5OH (4) C2H5OC2H5

Answers

The correct answer is : (1) C3H7COOH.

Ethanoic acid has the molecular formula CH3COOH. It belongs to the homologous series of alkanoic acid or carboxylic acid. Homologous series are series of organic compounds in which a member differs from the next member by –CH2. One of the major characteristics of the homologues is their similarity in chemical properties. Propanoic acid (C3H7COOH) is the only member of the alkanoic acid family among the options given. So, it is the only one that has similar chemical properties with ethanoic acid.The other options are wrong because:

(2) C2H5OH belongs to the alcohol family.

(3) C2H5COOC2H5 belongs to the alkanoates family (esters)

(4) C2H5OC2H5 belongs to the ether family.

You need to first consider the properties of ethanoic acid that are worth noting. Ethanoic acid is a weak acid (the carboxyl group has a resonance-stabilized base), and the length of its carbon chain (2 carbons) reflects the strength of its Van der Waals forces. Also, the hydroxyl group (as part of the carboxyl group) confers a large dipole moment to the compound. The most similar compound would be the one that resembles ethanoic acid in these respects.Thus, I would say that the answer is (2) C2H5OH. Because oxygen is highly electronegative, it can retain an extra electron without much difficulty, making the hydroxyl group slightly acidic. The hydroxyl group also confers a large dipole moment, and the 2 carbon backbone indicates similar Van der Waals interactions.

Zaccharias Janssen was a scientist who studied properties of light and invented one of the first compound microscopes in the late 1500s. Which property did Janssen most likely believe about light during the time of his invention?a.Light bends around objects.
b.Light bounces off surfaces.
c.Light travels in a curved path.
d.Light is made up of waves.

Answers

Answer : Option B) Light bounces off Surfaces.

Explanation : Zaccharias Janssen a scientist who was a spectacle maker, is considered to be the founder of a compound microscope; believed that the ray of light when focused on a reflecting surface bounces back. This was the main property of light which he discovered and which led him to a new innovation.

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