balancing equations and types of reactions GREAT FOR STUDENTS OF 6,7,8,9 AND 10TH GRADE
1. GEMS MODERN ACADEMY
TERM 1
REVISION
TIME : 45 min
Q1
1. State two differences between elements and compounds. [2]
2. Give the Latin names for Tin and Copper. [2]
3. State the electronic configuration of :- H,Ne,Ca. [3]
4. Define the term isotopes.Whydo they differ from the physical properties?
[3]
Q2
Mg + O MgO
1. Correct the equation.Identify the reactants and products. [2]
2. What do the following mean in a reaction [2]
a. ∆
b. (aq.)
3. An element ‘X’ has 2 electrons in it’s valence,it is non reactive. [3]
a. Write it’s symbol
b. Write the element.
c. Name a another element which is non reactive
4. An element ‘A’ has 4 electrons.It has a mass number of 9 .Find : -
a. Atomic number
b. Mass no.
c. State it’s electronic configuration [3]
Q3
1. State the use of the test tube and conical flask? [2]
2. Why is there a need for the Wire gauze ? [2]
3. Which instrument is used to handle tiny objects?Name any two other lab
apparatus. [3]
2. 4. If you would like to burn a magnesium ribbon,what apparatus would you
need.Justify your statement.Write a balanced equation for the same.[3]
Q4
Na + Cl2 NaCl
1. State the law of conservation of mass/matter [2]
2. Is the above correctaccording to this law?Why/Why not? [2]
3. Correct the above equation.Identify the reactants and products.[3]
4. Balanced equations
a. Why?
b. How?
c. Example? [3]