The Group 1 elements, which include lithium (Li), sodium<span> (</span>Na) and potassium (K<span>) are also known as the alkali metals. They all </span>have<span> one electron in the outer shell and so they </span>have similar properties<span>.</span>
Answer:
Leo Hendrik Baekeland
Explanation:
Baekeland discovered Bakelite, the first successful plastic, but wanted to make a more better and more heat resistant plastic.
Answer:
6400 molecules / cm^3
Explanation:
10.6*10^-16 mol/L * 6.022*10^23 molecules/mol * 1 L / 1000 cm^3 * 1 / 100 L = 6400 molecules / cm^3
Answer:
The heat lost by the water
3.8 KJ
The heat gain by ice
= 228.76 J
The heat required to melt the ice
= 3340 J
Explanation:
Mass of ice cube
= 10 gm
Initial temperature of ice cube
= 0 °c
Mass of water
= 100 gm
Initial temperature of water
= 20 °c
Final temperature of mixture
= 10.93 °c
(a). Total heat lost by the water
(
-
)
⇒
100 × 4.184 (20 - 10.93)
⇒
3.8 KJ
This is the heat lost by the water.
(b). Heat gained by the ice cube
=

⇒
= 10 × 2.093 × ( 10.93 - 0)
⇒
= 228.76 J
This is the heat gain by ice.
(C). Heat required to melt the ice
=
× Latent Heat
⇒
= 10 × 334
⇒
= 3340 J
This is the heat required to melt the ice.