Differentiate between
Mixture and compounds

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

Differentiate between
Equation and chemical formulae

EASY

7th CBSE

IMPORTANT

Expanded Universal Science 7>Chapter 5 - Matter and Chemical Formulae>ASSESSMENT ZONE>Q E

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

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 $\mathrm{X}$ that has $12$ protons and $12\mathrm{}$ 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 $\mathrm{Y}$ 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 $\mathrm{Y}$.

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 $\mathrm{P}\mathrm{b}{\left(\mathrm{N}{\mathrm{O}}_3\right)}_2$. 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: ${\left(\mathrm{N}{\mathrm{H}}_4\right)}_2\mathrm{S}{\mathrm{O}}_{4 }, \mathrm{N}{\mathrm{H}}_{3 }, \mathrm{N}{\mathrm{H}}_2\mathrm{C}\mathrm{O}\mathrm{N}{\mathrm{H}}_2$