Motion & Forces
What force keeps objects from floating into space?
Gravity
What are the three types of heat transfer?
Conduction, convection, and radiation.
What happens during a chemical reaction?
Atoms rearrange to form new substances.
What does each row in the periodic table represent?
A period.
What state of matter has a definite volume but no definite shape?
Liquid.
What type of wave is used in sonar technology?
Sound waves.
What are the three main states of matter?
Solid, liquid, and gas
What type of energy is stored in food?
Chemical energy.
What law states that matter cannot be created or destroyed in a reaction?
Law of Conservation of Mass.
What element has the atomic number 1?
Hydrogen.
What process turns a liquid into a gas?
Evaporation.
What is the amplitude of a wave?
The height of the wave from its rest position.
What is inertia?
An object’s resistance to changes in motion.
What type of energy transfer occurs when heat moves through a metal spoon?
Conduction.
What are the substances present before a chemical reaction called?
Reactants.
What group contains highly reactive metals?
Alkali metals.
What happens during sublimation?
A solid turns directly into a gas.
What is the Doppler effect?
The change in frequency due to motion between source and observer.
What causes friction?
Contact between surfaces.
What type of energy causes the movement of ocean currents?
Thermal energy.
What type of reaction absorbs heat?
Endothermic reaction.
What are elements in Group 18 called?
Noble gases.
What phase change occurs when water freezes?
Solidification.
What type of wave does light travel as?
Electromagnetic wave.
What happens when opposing forces are balanced?
The object remains at rest or moves at a constant speed.
What is absolute zero?
The lowest possible temperature where molecular motion stops
What does a catalyst do?
Speeds up a reaction without being consumed.
What is the most abundant element in Earth’s crust?
Oxygen.
What is plasma?
A high-energy state of matter where atoms lose electrons.
What property of a wave determines its pitch?
Frequency.