Answer:
The emission spectrum is formed when the electrons of a particular atom absorb energy and are excited (in this case by heating), reaching higher energy levels.
You can see it for example with an experiment where we light alcohol mixed with banana chips (it has potassium). The burning alcohol emits heat that makes potassium atoms excite and these in turn emit something red, orange light. If we add for example boric acid you see a green light.
Explanation:
Answer:
the different things that we have and animals are.:
- to gain emotional support.
- it acts as a real friend.
- for meat,flesh,milk and milk products, wool,etc.
- for transportation like horse
- to enjoy and play like with dolphins
Given:
The density of air = 1.19 g/L at 25°C and atmospheric pressure,
or
density = 1.19 x 10⁻³ kg/L
Volume of air in the room is
V = 12.5*19.5*6.0 = 1462.5 ft³
Note that
1 ft³ = 28.317 L
Therefore
V = (1462.5 ft³)*(28.317 L/ft³) = 4.1414 x 10 ⁴ L
By definition, mass = density*volume.
Therefore, the mass is
(1.19 x 10⁻³ kg/L)*(4.1414 x 10⁴ L) = 49.283 kg
Answer: 49.3 kg (nearest tenth)
<span>use a mortar & pestle to grind the solute into smaller particles, thus increasing the surface area.</span>
<h3>Answer:</h3>
The smallest unit which maintains the physical properties of a compound is a <u>Molecule</u>.
<h3>Explanation:</h3>
Option-A, <u><em>Atom</em></u> is incorrect because statement is asking about the physical properties of a compound. Therefore, as compound is made up of two or more, same or different atoms hence, atom can not be the correct answer.
Option-B, <u><em>Element</em></u> is also incorrect because Element can be mono-atomic like He, Ne, Ar <em>e.t.c </em>or a molecules like N₂, O₂, F₂ <em>e.t.c</em> but it can't be a compound because in compound the joining elements are different as all compounds are molecules but all molecules are not compounds.
Option-C, <u><em>Molecule</em></u> is the correct answer because all compounds are molecules unless the atoms forming the compound are different.
Option-D, <em><u>Alloy</u></em> is also incorrect because Alloys are a homogeneous mixture of two or more metals. Hence, they can't be considered as compounds as they can be separated by physical means.