EASY
7th CBSE
IMPORTANT
Earn 100

Classify the following substances as elements, compound and mixtures, Bromine, gold dust, distilled water, ink, magnesium chloride, honey.

Important Questions on Matter and Chemical Formulae

MEDIUM
7th CBSE
IMPORTANT
Expanded Universal Science 7>Chapter 5 - Matter and Chemical Formulae>ASSESSMENT ZONE>Q E
What do you understand by a balanced chemical equation? Explain with the help of an example
MEDIUM
7th CBSE
IMPORTANT
Expanded Universal Science 7>Chapter 5 - Matter and Chemical Formulae>ASSESSMENT ZONE>Q F
An atom X that has 12 protons and 12 electrons, loses two electrons to form an ion. What will be the charge on the ion? What will be the number of protons and electrons in the ion?
MEDIUM
7th CBSE
IMPORTANT
Expanded Universal Science 7>Chapter 5 - Matter and Chemical Formulae>ASSESSMENT ZONE>Q F
An Element Y that has 17 protons and 17 electrons it gains one electron to form an ion. What will be the charge on the ion? Write the number of protons and electrons in Y.
HARD
7th CBSE
IMPORTANT
Expanded Universal Science 7>Chapter 5 - Matter and Chemical Formulae>ASSESSMENT ZONE>Q F
Write the differences between iron-sulphur mixture and iron sulphide compound.
MEDIUM
7th CBSE
IMPORTANT
Expanded Universal Science 7>Chapter 5 - Matter and Chemical Formulae>ASSESSMENT ZONE>Q F
The formula of lead nitrate is PbNO32. What is the ratio in which three elements combine with each other in this compound? 
MEDIUM
7th CBSE
IMPORTANT
Expanded Universal Science 7>Chapter 5 - Matter and Chemical Formulae>ASSESSMENT ZONE>Q F
How many atoms of hydrogen are present in one molecule of the following compounds: NH42SO4 , NH3 , NH2CONH2
HARD
7th CBSE
IMPORTANT
Expanded Universal Science 7>Chapter 5 - Matter and Chemical Formulae>ASSESSMENT ZONE>Q F
Write the chemical formulae for the following compounds: Magnesium chloride, Zinc sulphide, Sodium sulphate, Calcium bicarbonate.
HARD
7th CBSE
IMPORTANT
Expanded Universal Science 7>Chapter 5 - Matter and Chemical Formulae>ASSESSMENT ZONE>Q F
What is a chemical equation? Explain with an example.