Respiration & Gases
About 78 % of Earth’s atmosphere is made of this gas.
Nitrogen
What positively-charged particle sits in the nucleus?
Proton
True or false – sound can travel through a vacuum?
False
A solution with pH 7 is called what?
Neutral
What is the largest planet in our Solar System?
Jupiter
A glowing splint that relights is a classic test for this gas.
Oxygen
The atomic number tells you the number of which particles?
Protons
Which property of a sound wave decides its pitch?
Frequency
Is a substance with pH 3 an acid or an alkali?
Acid
Plants make food using this process.
Photosynthesis
Give the word equation for aerobic respiration.
glucose + oxygen → carbon dioxide + water (+ energy/ATP)
Name the two kinds of particles found in an atomic nucleus.
Protons and Neutrons
Bending of light when it changes medium is called what?
Refraction
Litmus paper turns which colour in acid?
Which planet is nicknamed the “Red Planet”?
Mars
Which muscle contracts to enlarge the thoracic cavity during inhalation?
The diaphragm
Why do metals conduct electricity well?
They have free (delocalised) electrons that can move.
What happens to light when it strikes a smooth mirror?
Reflection
Orange juice is about pH 4. Is it acidic or basic?
Acidic
Which layer of Earth is made mostly of liquid iron and nickel?
The outer core
Which green pigment in leaves captures light energy for photosynthesis?
Chlorophyll
What is the central part of an atom called?
Nucleus
Light is what type of wave: transverse or longitudinal?
Transverse
What is the highest (most alkaline) value on the pH scale?
14
Which scientist stated the three laws of motion?
Isaac Newton