3 years ago

Classify each of the following as a physical or chemical property

Chemistry

1 answer:

just olya [345]3 years ago

5 0

Could I hear the options..

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rank the group 1a elements tested in order of increasing energy emission when electrons returns to the ground state. explain thi

labwork [276]

Answer:

The increasing order of energy emission is as follow

Li < Na < K < Rb < Cs

Explanation:

The Characteristic colors of alkali metals are

Li-crimson red
Na- golden yellow
K- pale violet
Rb and Cs- violet

These flame color show that when we moved from down the group, the wavelength decreases (frequency increases).
As the color of Li is red that shows ,it has less emission energy as compare to Rb and Cs that have color violet (more emission energy).

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3 years ago

Describe what you should do to recover only the water from a sample of muddy water.

xz_007 [3.2K]

Answer:

By using a filter.

Explanation:

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3 years ago

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What is the temperature of 0.750 mol of a gas stored in a 6,050 mL cylinder al 221 atm?

Rasek [7]

Answer:

T = 246 K

Explanation:

Given that,

Number of moles, n = 0.750 mol

The volume of the cylinder, V = 6850 mL = 6.85 L

Pressure of the gas, P = 2.21 atm

We need to find the temperature of the gas stored in the cylinder. We know that,

PV= nRT

Where

R is gas constant

T is temperature

So,

$T=\dfrac{PV}{nR}\\\\T=\dfrac{2.21\times 6.85}{0.75\times 0.0821}\\T=245.85\ K$

T = 246 K

So, the temperature of the gas is equal to 246 K.

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2 years ago

Why can two igneous rocks that have the same minerals but different names?

photoshop1234 [79]

C. the rock may have diferrent textures

7 0

3 years ago

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What are the requirements for combustion of a candle?

cestrela7 [59]

For a candle to burn, it requires a spark, which provides the activation energy for the oxidation reaction of the hydrocarbon making the candle.
It also requires oxygen to facilitate the oxidation of the hydrocarbon.
Therefore the two main requirements of combustion of a candle are oxygen and a spark (or an initial flame)

7 0

3 years ago