Answer:
a
Explanation:
a. molecules become lighter when heated
1. Nucleus, neutrons
2. Tiny
3. Electrons, shells
4. Protons
5. Configuration
6. Electrons
7. Protons
Answer:
heat flux ( Q ) = 8 W/m³ uniform heat flux throughout the block
Explanation:
flat plate ecuation with uniform source:
- d2T / dx² = - Q / k...........from general balance
- if x = 0 ⇒ dT / dx = 0 ; Q = 0
- if x = L ⇒ T = T1
∴ k = 0.04 W/mC; L = 0.2 m
If T = - 100x² + 20x
⇒ dT / dx = - 200x + 20
⇒ d2T / dx² = - 200 = - Q / k
⇒ Q / k = 200
⇒ Q = 200 * 0.04 W/mC
⇒ Q = 8 W/m³
The molar mass of Ca(NO₃)2 is 164 g/mol
<u><em> Explanation</em></u>
Ca(NO₃)2 is made up of Ca , N and O elements
Therefore the molar mass of Ca(NO₃)2 = molar mass of Ca + molar mass of N +molar mass of O
from periodic table the molar mass of Ca is 40 g/mol
for N = 14 g/ mol
for O = 16 g/mol. since they are 3 atoms of O in Ca(NO₃)2 the molar mass = 16 x3 = 48 g/mol
The molar mass of Ca(NO₃)2 = 40 g/mo + [(14 g/mol + 48 g/mol) 2] =164g/mol
