1. A pure substance is a chemical substance that has the same composition throughout. There are two

Chemistry

1 answer:

marin [14]3 years ago

3 0

Answer:

Option D. Iron and sulfur react to form iron sulfide

Explanation:

Reaction of iron with sulphur is a chemical property and not a physical property.

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Which of these describes an endothermic process?

Phoenix [80]

The third one down: "When barium hydroxide is mixed with ammonium chloride, ice crystals form on the outside of the container."

This is because an endothermic reaction [process] takes in more energy than it releases. Therefore because a decrease in energy leads to a decrease in temperature, the ice crystals forming show that it must be a endothermic reaction [process].

Hope this helps! :)
AJ

3 0

3 years ago

Read 2 more answers

1. The emission spectrum of mercury atoms has a bright green line with wavelength

SashulF [63]

Emission spectrum results from the movement of an electron from a higher to a lower energy level. The frequency of the photon is 5.5 * 10^14 Hz.

From the formula;

E = hc/λ

h = Plank's constant = $6.6 * 10^-34$ Js