balancing equations and types of reactions great for students of 6,7,8,9 and 10th grade
DESCRIPTION
balancing equations and types of reactions GREAT FOR STUDENTS OF 6,7,8,9 AND 10TH GRADE Questions asked on equations equations for practiseTRANSCRIPT
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.Why do they differ from the physical properties?
[3]
Q2
Mg + O MgO1. 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 symbolb. 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 numberb. 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]
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 NaCl1. State the law of conservation of mass/matter [2]2. Is the above correct according 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]