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A 7th Grade Scie... ► Noelani Berisa - atom 1.pdf
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15 Chemical Sustance Man is made up of TWO OT
more different kinds of atoms bonded together.
cech
Directions: Look at each picture below. Each circle represents an atom. If they are
touching, they are chemically combined. Each element is represented by a pattern.
Write the number of atoms, molecules, elements and compounds for each example on
the lines below. The first example has been done for you.
1
2
30
3
atom
molecule
clement
compound
1
2.
1
atom
molecule
element
compound
autom
molecule
element
compound
3

i think   the answer is c hope i'm right

metals are good conductor of electricity. it has free electrons on their surface. according to electron pool theory, each atom present in a metal crystal losses all of its valence electron and as a result a pool of free is form. these pool of electrons are free to move and   conduct electricity easily   while making metal as good conductor.

the correct answer is a. the ability of electrons to flow throughout the metal.

if it's not useful, feel free to report for mistake in answer.

answer: semi-infinite solid initially at a uniform temperature of 400 ◦c is cooled at its surface by convection. the cooling fluid at a constant temperature of 200 ◦c has a convective coefficient (ha) of 250 w/m2.k. the physical properties of the solid: k = 20 w/m.k and α = 4 * 10-5  m2/s. using δx = 0.04 m and δt = 10 s. write the finite difference equations describing the transient heat transfer of the first five δx and the temperature profile after 30 s.