CHEMISTRY WORKSHEET 3 CHAPTER 4: SEPARATION OF SUBSTANCE TOPIC: METHODS OF SEPERATION OF INSOLUBLE SOLID-LIQUID MIXTURES Grade:VI
Fill in the blanks
1. is a universal solvent

2. An example of a coagulating agent is

3. and are used for removing insoluble impurities from river and canal water in water treatment plant

4. A special type of paper with very small holes used for filtration in laboratories is called

Answer the following

1. Differentiate between solute and solvent

2. Differentiate soluble and insoluble substances with example.

3. What are suspensions? How can the particles of suspension be removed?
​

alkaline metals are lithium, sodium, rubidium, potassium, cesium and francium.

alkali metals have electronegativity from 0.7 to 1, lowest in periodic table of elements, which means that alkali metals (i group in periodic table) has positive oxidation number in compounds.

electronegativity is a chemical property that describes the tendency of an atom to attract a shared pair of electrons towards itself.

alkaline metals (far left in main group) have lowest ionizations energy and easy remove valence electrons,

for example, potassium is the alkali metal and has a single valence electron in the outer electron shell.

electron configuration of potassium is: ₁₉k 1s²2s²2p⁶3s²3p⁶4s¹.

they can not exist alone in nature, because they are very reactive.

nacl or sodium chloride is an ionic compound. this is because an ionic compound pertains to a compound that consists of positively and negatively charged ions. in this case, na (sodium) has a tendency to lose one electron when it reacts with with other atoms, so the resulting sodium ion contains 11 protons and 10 electrons, thus making it positively charged (na+), when chlorine reacts, it usually gains one electron to form an ion called chloride, thus making it negatively charged ( since the ions are oppositely charged, they attract.

answer:

technetium is the most reactive. this is followed by silver. the least reactive out of these three elements is strontium.