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3 years ago

What happens when light strikes a dark heavy object

1 answer:

8 0

The colour of a substance determines the way it reacts when light rays are incident on it. When light rays strike a dark object, the dark object will absorb all the wavelengths of the light and convert them to heat energy, thereby increasing its temperature. Lighter colors do not absorb all the wavelengths of light, they reflected some depending on the type of color.

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Solutions can be composed of:

Anika [276]

A solution may exist in any phase so your answer is D. any of the above

hope this helps :)

7 0

4 years ago

At a certain temperature a 42.55% (v/v) solution of ethyl alcohol, C2H5OH, in water has a density of 0.9027 g mL-1. The density

swat32

Answer:

a. 7.187M.

b. 7.962m.

c. 0.1846

Explanation:

This solution contains 42.55mL of ethyl alcohol in 100mL of solution.

a. Molar concentration = Moles ethyl alcohol / L solution:

Moles ethyl alcohol -Molar mass: 46.07g/mol-

42.55mL * (0.7782g/mL) * (1mol / 46.07g) = 0.7187 moles ethyl alcohol

Liters solution:

100mL * (1L / 100mL) = 0.100L

Molar concentration: 0.7187mol / 0.100L = 7.187M

b. Molal concentration: Moles ethyl alcohol (0.7187moles) / kg solution

kg solution:

100mL * (0.9027g / mL) * (1kg / 1000g) = 0.09027kg

Molal concentration: 0.7187mol / 0.09027kg = 7.962m

c. Mole fraction: Moles ethyl alcohol / Moles ethyl alcohol + moles water

Moles water: -molar mass: 18.01g/mol-

Volume water = 100mL - 42.55mL = 57.45mL

57.45mL * (0.9949g/mL) * (1mol/18.01g) = 3.1736 moles water

Moles fraction:

0.7187 moles ethyl alcohol / 0.7187 moles ethyl alcohol+3.1736 moles water

= 0.1846

4 0

3 years ago

Which is NOT a sign that a double displacement reaction has occurred?

kramer

the coefficients are equal is NOT a sign that a double displacement reaction has occurred

Explanation:

Usually during solutions of two ionic compounds are combined a precipitate (solid) is created. The mix may become cloudy, or may also separate, with the solids falling at the seat of the receptacle. Infrequently, the mix may bubble as a gas or water is produced.

A precipitation reaction is at two aqueous ionic compounds that make a unique ionic compound that is not soluble in water. The insoluble product compound is called the precipitate. The reaction, in this case, is not balanced, which are evaluated by summing coefficients.

3 0

3 years ago

Most of the chemical reactions inside your body rely on protein catalysts called enzymes to take place. For example, the enzyme

charle [14.2K]

It would affect protein digestion.

5 0

3 years ago

When copper metal is affed to silver nitrate in solution, silver metal and copper (II) nitrate are produced. Use the balanced eq

trapecia [35]

<h2>Answer:</h2>

Cu(s) + 2AgNO3(aq) → Cu(NO3)2(aq) + 2Ag(s).

Moles Cu present = 100g Cu x 1 mol Cu/63.55g

= 1.574moles Cu

Mass of Ag produced = 1.574mol Cu x 2mol Ag / 1mol Cu x 107.9g Ag/mol Ag

= 340.g Ag

6 0

3 years ago