Chemistry Basics
What are the three common states of matter?
Solid, liquid, gas
What organ pumps blood through your body?
Heart
What planet do we live on?
Earth
What tool measures temperature?
Thermometer
What force pulls objects toward Earth?
Gravity
What is H₂O commonly called?
Water
What gas do humans need to breathe?
Oxygen
What is the closest star to Earth?
The Sun
What metric unit is commonly used to measure length?
Meter (centimeters/millimeters also acceptable depending on context)
What happens to water at 0°C?
It freezes
What is the smallest unit of an element?
Atom
What process do plants use to make food using sunlight?
Photosynthesis
Which planet is known as the Red Planet?
Mars
What is an educated prediction that can be tested called?
Hypothesis
Which travels faster: light or sound?
Light
What is the chemical symbol for oxygen?
O
What part of a cell contains most of its genetic material?
Nucleus
What causes day and night on Earth?
Earth's rotation
What variable does a scientist intentionally change in an experiment?
Independent variable
What type of energy is stored in food?
Chemical energy
What is the difference between an element and a compound?
An element contains one type of atom; a compound contains two or more elements chemically bonded.
What molecule contains the genetic instructions for living things?
DNA
Why does the Moon appear to change shape throughout the month?
We see different portions of the Moon's sunlit half as it orbits Earth.
Why do scientists repeat experiments?
To check whether the results are consistent/reliable.
Why does ice float on liquid water?
Solid water is less dense than liquid water.