Answer:
D all polar molecules have hydrogen bonding
Answer:
<u>The temperature difference is</u>
Explanation:
The formula that is to used is :
ΔΔ
<em>where ,</em>
- <em>Δ is the heat supplied in calories = 300cal</em>
- <em> is the mass of water taken = m (assumed)</em>
- <em>Δ is the change in temperature</em>
- <em> is the specific heat of water = </em>
ΔT :
Answer: D NH3
Explanation:When NH3 , popularly called ammonia react with water, the water molecules dissociate into it's components H^+ and OH^-,the H^+ which is the cation forms an hydrogen bond with ammonia NH3 to form NH4^+ while the anion form is OH^-.the reaction itself is a dipolar reaction .
NH3 + H2O_____NH4^+ +OH^-
Answer:
1.Very good electrical conductivity :<u> Metals</u> (Decreacing order of conductivity)
- <em>Silver > Copper > Gold > aluminium</em>
2. Amphoteric <u>: Metal elements</u>
- <em>Beryllium , Aluminium , Zinc </em>,
3.Gaseous at room temperature: mostly <u>Nobel gases elements</u> and some non - metal elements.
- <em>Helium ,neon , argon , krypton , fluorine , Oxygen , nitrogen</em>
4.Solid at room temperature:<u> Mostly Metals</u> (few non-metals, metalloid elements)
- <em>Metals (Sodium , potassium , calcium , gold are solid)</em>
<em>Non- metals(Carbon ,Boron )</em>
<em>Metalloids(antimony)</em>
<em>5.</em> Brittle <em>: </em><u>non - metals </u>(can't be rolled into wires)
<em>Hydrogen , carbon , sulfur , phosphorus</em><u> </u>
Explanation:
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