1
What is the nucleon number of potassium?
39
What do you call the change of state from gas to liquid?
condensation
What is the electron configuration/ electron arrangement of Aluminum?
2,8,3
What is the element with 4 valence electrons and is found in period 2?
Carbon
How many protons are there in Lithium?
3 protons
When someone's cooking, you can smell it even from a distance. This statement shows what process?
Diffusion
What is the chemical formula for ammonia?
NH3
Be, Mg, Ca, Sr, Ba, Ra
Give an element that can exist as monoatomic gas.
He, Ne, Ar, Kr, Xe, Rn
What do you call the group of metals that are typically soft, stored in oil, and the most reactive among other metal groups?
alkali metals
Describe the left to right trend of metallic property in the periodic table.
Decreasing
How many valence electrons are there in Nitrogen atom and what is its valency?
5 valence electrons
3 valency
Name the compound: MgS
Magnesium sulfide
Name the compound:CO
Carbon monoxide
Name the compound:SO2
Sulfur dioxide
Name the compound: MgCO3
Magnesium Carbonate
Among the following pH, which one is least acidic?
pH 1 pH 5 pH 7 pH 12
pH 12
How do you call a compound of oxide that can react to both acid and base?
Amphoteric
Will the compound MgO give acid or base solution when reacted with water?
Base
Lithium is extracted by electrolysis of molten lithium chloride. State the products of the electrolysis of molten lithium chloride at cathode.
Lithium metal
In the reaction CuO + H2 --> Cu + H2O,
which pair undergone oxidation?
H2 -->H2O
Balance the equation:
……….NO2 + 8NH3 → ……….N2 + 12H2O
6NO2 + 8NH3 → 7N2 + 12H2O
What reaction happens in the anode?
Oxidation
How will you test for the presence of calcium and carbonate in a chemical sample?
Ca - reaction with alkali will give white precipitate
CO3 - reaction with acid will give carbon dioxide (test it with lime water).