MEDIUM
Lower Secondary Stage 8
IMPORTANT
Earn 100

Coffee contains the compound caffeine.

Caffeine has the formula C8H10N4O2

Name the four elements found in caffeine.

Important Questions on Chemical Reactions

EASY
Lower Secondary Stage 8
IMPORTANT
Cambridge Lower Secondary Science Stage 8 : Student's book>Chapter 6 - Chemical Reactions>Exercise 1>Q 1
A teacher reacts sodium and chlorine together. Sodium chloride is made. Write a word equation to show this reaction.
EASY
Lower Secondary Stage 8
IMPORTANT
Cambridge Lower Secondary Science Stage 8 : Student's book>Chapter 6 - Chemical Reactions>Exercise 1>Q 2
Photosynthesis is a chemical reaction that takes place in plant leaves. Carbon dioxide and water are used to make oxygen and glucose. Write this as a word equation.
EASY
Lower Secondary Stage 8
IMPORTANT
Cambridge Lower Secondary Science Stage 8 : Student's book>Chapter 6 - Chemical Reactions>Exercise 2>Q 3

Write the name of the compound. Use the Periodic Table to help you find the name of the element from its symbol.

LiCl

EASY
Lower Secondary Stage 8
IMPORTANT
Cambridge Lower Secondary Science Stage 8 : Student's book>Chapter 6 - Chemical Reactions>Exercise 2>Q 3

Write the name of the compound. Use the Periodic Table to help you find the name of the element from its symbol.

CaO

EASY
Lower Secondary Stage 8
IMPORTANT
Cambridge Lower Secondary Science Stage 8 : Student's book>Chapter 6 - Chemical Reactions>Exercise 2>Q 3

Write the name of the compound. Use the Periodic Table to help you find the name of the element from its symbol.

MgS

EASY
Lower Secondary Stage 8
IMPORTANT
Cambridge Lower Secondary Science Stage 8 : Student's book>Chapter 6 - Chemical Reactions>Exercise 2>Q 3

Write the name of the compound. Use the Periodic Table to help you find the name of the element from its symbol.

NaNO3

 

EASY
Lower Secondary Stage 8
IMPORTANT
Cambridge Lower Secondary Science Stage 8 : Student's book>Chapter 6 - Chemical Reactions>Exercise 2>Q 3

Write the name of the compound. Use the Periodic Table to help you find the name of the element from its symbol.

 

K2CO3
MEDIUM
Lower Secondary Stage 8
IMPORTANT
Cambridge Lower Secondary Science Stage 8 : Student's book>Chapter 6 - Chemical Reactions>Exercise 5>Q 1
 Describe the two signs that show magnesium is reacting with the hydrochloric acid.