Science Quarter 2 revision

What is the smallest building block of matter?

• Molecules

• Elements

• Atoms

• Compounds

How many natural elements are there in the periodic table?

• 118

• 92

• 26

• 118

What is the type of matter made of two or more different atoms bonded together?

• Mixtures

• Compounds

• Elements

• Molecules

What is the transition of matter from a solid to a liquid?

• Melting

• Evaporation

• Sublimation

• Condensation

What type of change is the change of matter that doesn't change its identity?

• Physical change

• Irreversible change

• Chemical change

• Reversible change

What type of matter is table salt?

• Element

• mixture

• Compound

• Pure substance

What is the portion of energy from the sun that reaches the Earth?

• Ultraviolet light

• Visible light

• X-rays

• Infrared light

What is the bouncing back of light when it falls on an opaque surface?

• Refraction

• Absorption

• Reflection

• Dispersion

What is the linear order of a group of organisms that feed on each other which shows the flow of energy in an ecosystem?

• Food web

• Food chain

• Trophic level

• Energy pyramid

What is the speed of sound affected by?

• Altitude

• Density

• Pressure

• Temperature