Showing
6
question(s) for
UK Class 8
—
Subject:
Science
Science
Q1.
Why does increasing temperature usually increase the rate of a chemical reaction?
Answer:
Increasing temperature gives particles more kinetic energy, causing them to move faster and collide more frequently and with greater energy. This increases the likelihood of successful collisions.
Science
Q2.
Why are cells in multicellular organisms specialised?
Answer:
Cells become specialised so that they can perform particular functions efficiently. Different specialised cells work together to form tissues and organs.
Science
Q3.
What is the relationship between mass, force and acceleration?
Answer:
According to Newton's second law, force equals mass multiplied by acceleration, expressed as F = ma.
Science
Q4.
Why does increasing the surface area of a solid usually increase its reaction rate?
Answer:
A greater surface area exposes more particles to other reacting particles, increasing the frequency of collisions and therefore usually increasing the reaction rate.
Science
Q5.
Why is energy transferred rather than created or destroyed?
Answer:
The principle of conservation of energy states that energy cannot be created or destroyed. It can only be transferred between stores or transformed from one form into another.
Science
Q6.
Why does a metal conduct electricity better than many non-metal materials?
Answer:
Metals contain electrons that can move through the material, allowing electric charge to flow relatively easily.