Cotton being woven to make sheets. Is it a chemical change or a physical change? Give reason.

The process of weaving involves the joining of cotton yarns together using hand or with the help of looms. It involves the formation of no new substances with new properties. Therefore, cotton being woven to make sheets is a physical change.

Most transition elements can form more than one type of ion. Ion Name Example of compound Cu + Copper I ion Copper I oxide, Cu 2 O Cu 2 + Copper II ion Copper II oxide, CuO Fe 2 + Iron II ion Iron II chloride, FeCl 2 Fe 3 + Iron III ion Iron III chloride, FeCl 3 The II in the name tells you that the ion has a charge of 2 + . What do the I and III show?

The II in the name tells you that the ion has a charge of 2 + . Similarly, the I in the name tells us that, the ion has a charge of 1 + , and the III in the name tells us that, the ion has a charge of 3 + . Transition elements generally can form different ions because of their outer electrons in two different sets of orbitals.

E M B I B E

Complete Chemistry for Cambridge IGCSE® Second Edition>Chapter 4 - Atoms Combining>Checkup on Chapter 4>Q 7

EASY

Upper Secondary: IGCSE

IMPORTANT

Earn 100

The compound zinc sulphide has a structure like this:

Which type of bonding does zinc sulphide have?

Important Questions on Atoms Combining

MEDIUM

Upper Secondary: IGCSE

IMPORTANT

Complete Chemistry for Cambridge IGCSE® Second Edition>Chapter 4 - Atoms Combining>Q>Q 3

Cotton being woven to make sheets.

Is it a chemical change or a physical change? Give reason.

MEDIUM

Upper Secondary: IGCSE

IMPORTANT

Complete Chemistry for Cambridge IGCSE® Second Edition>Chapter 4 - Atoms Combining>Q>Q 1

Why are the atoms of the group

0

elements unreactive?

MEDIUM

Upper Secondary: IGCSE

IMPORTANT

Complete Chemistry for Cambridge IGCSE® Second Edition>Chapter 4 - Atoms Combining>Q>Q 6

Atoms of Group

0

elements will not form ions. Why?

EASY

Upper Secondary: IGCSE

IMPORTANT

Complete Chemistry for Cambridge IGCSE® Second Edition>Chapter 4 - Atoms Combining>Exercise 5>Q 1

The formula of sodium sulphite is

{Na}_{2} S

. What does this _$2$show?

EASY

Upper Secondary: IGCSE

IMPORTANT

Complete Chemistry for Cambridge IGCSE® Second Edition>Chapter 4 - Atoms Combining>Exercise 6>Q 1

Most transition elements can form more than one type of ion.

Ion	Name	Example of compound
${Cu}^{+}$	Copper $(I)$ ion	Copper $(I)$ oxide, ${Cu}_{2} O$
${Cu}^{2 +}$	Copper $(II)$ ion	Copper $(II)$ oxide, $CuO$
${Fe}^{2 +}$	Iron $(II)$ ion	Iron $(II)$ chloride, ${FeCl}_{2}$
${Fe}^{3 +}$	Iron $(III)$ ion	Iron $(III)$ chloride, ${FeCl}_{3}$