Sound
True or false? Sound waves cannot be reflected.
False
What is the substance that moves from the bloodstream to the air via the lungs?
Organelle containing DNA
Nucleus
Is Si the correct symbol for silver?
No
True or false? Forces always act in pairs.
True
The more energy a sound wave carries, the louder the sound and the bigger its... what?
Amplitude
What type of joint is the hip joint in the human skeleton? (fixed, hinge, or ball socket)
Ball socket
Would you find a vacuole in a plant or animal cell?
Plant cell
Formed when two or more elements chemically bond together.
A compound
Would a bigger planet normally have a stronger or weaker force of gravity than a smaller one?
Stronger
What type of wave is a sound wave?
Longitudinal
Name the small air sacs in the lungs where gas exchange takes place.
Alveoli
What type of transport is usually happening when oxygen is absorbed into cells?
Diffusion
Which element has the symbol Pb?
Lead
What name is given to the amount of matter in an object?
Mass
What is the lowest frequency of sound that most humans can hear? Give a number and the unit.
20 Hz
Pairs of muscles working against each other are called __________ muscles.
Antagonistic
Organs are groups of what working together?
Tissues
How many atoms in total are there in NaHCO3.
6 atoms
As a parachutist falls, they experience air resistance. In which direction does the air resistance act?
Upwards
State the speed of sound in air in m/s.
330 m/s
Largest bone in a human body.
Femur
Which organelle is responsible for aerobic respiration?
Mitochondria
What is the full name of the compound CuSO4?
Copper sulfate
If there are two or more forces acting on an object, the overall force acting is called the __________ force.
Resultant