Give the symbols for the following element: Chlorine

Symbols are the abbreviations for the name of the elements and every element has a specific symbol. Symbol for chlorine is Cl . it has the atomic number 17 .

How many hydrogen atoms are in a molecule of the following compound: Hydrochloric acid HCl

Hydrogen atom is represented by the symbol H . A chemical formula is a symbolic representation of the compounds, which shows atoms of the elements and the number of atoms present in that particular molecule of the compound. A molecule of hydrochloric acid contains one hydrogen atom and one chlorine atom.

E M B I B E

Cambridge Lower Secondary Science Stage 8 : Student's book>Chapter 4 - Elements, Compounds and Mixtures>End of chapter review>Q 4

EASY

Lower Secondary Stage 8

IMPORTANT

Earn 100

Give the symbols for the following element:

Sodium

Important Questions on Elements, Compounds and Mixtures

EASY

Lower Secondary Stage 8

IMPORTANT

Cambridge Lower Secondary Science Stage 8 : Student's book>Chapter 4 - Elements, Compounds and Mixtures>End of chapter review>Q 4

Give the symbols for the following element:

Chlorine

EASY

Lower Secondary Stage 8

IMPORTANT

Cambridge Lower Secondary Science Stage 8 : Student's book>Chapter 4 - Elements, Compounds and Mixtures>End of chapter review>Q 5

Which two factors affect the rate of diffusion?

EASY

Lower Secondary Stage 8

IMPORTANT

Cambridge Lower Secondary Science Stage 8 : Student's book>Chapter 4 - Elements, Compounds and Mixtures>End of chapter review>Q 6

How many hydrogen atoms are in a molecule of the following compound:

Water $(H_{2} O)$

EASY

Lower Secondary Stage 8

IMPORTANT

Cambridge Lower Secondary Science Stage 8 : Student's book>Chapter 4 - Elements, Compounds and Mixtures>End of chapter review>Q 6

How many hydrogen atoms are there in a molecule of the following compound:

Methane $({CH}_{4})$

EASY

Lower Secondary Stage 8

IMPORTANT

Cambridge Lower Secondary Science Stage 8 : Student's book>Chapter 4 - Elements, Compounds and Mixtures>End of chapter review>Q 6

How many hydrogen atoms are in a molecule of the following compound:

Hydrochloric acid $(HCl)$

EASY

Lower Secondary Stage 8

IMPORTANT

Cambridge Lower Secondary Science Stage 8 : Student's book>Chapter 4 - Elements, Compounds and Mixtures>End of chapter review>Q 7

Which one of these is an element?

EASY

Lower Secondary Stage 8

IMPORTANT

Cambridge Lower Secondary Science Stage 8 : Student's book>Chapter 4 - Elements, Compounds and Mixtures>End of chapter review>Q 8

Copper is a shiny metal. A piece of it is heated in oxygen. Its surface becomes dull and black. Name the compound that is made in this chemical change.

MEDIUM

Lower Secondary Stage 8

IMPORTANT

Cambridge Lower Secondary Science Stage 8 : Student's book>Chapter 4 - Elements, Compounds and Mixtures>End of chapter review>Q 8

Copper is a shiny metal. A piece of it is heated in oxygen. Its surface becomes dull and black. Describe how the compound is different from copper.