Mass & Weight
What is the definition of mass?
The amount of matter in an object.
Name a physical property that can be observed directly.
State (solid, liquid, gas).
What is a chemical change?
A change that produces one or more new substances.
What unit measures volume?
Liters (L) or cubic centimeters (cm³).
What is thermal energy?
The total energy of the motion of all the particles in an object.
How does weight differ from mass?
Weight is the measure of the force of gravity on an object.
What is density?
The mass per unit volume of an object, typically measured in g/cm³.
Name a common example of a chemical change.
Rusting of iron or burning wood.
What does 1 g/cm³ represent?
The density of a substance; substances with a density greater than 1 g/cm³ sink in water.
Describe an endothermic change.
A change that absorbs energy, such as melting ice.
What unit is used to measure mass?
Kilograms (kg) or grams (g)
Give an example of an indirect property.
Viscosity or boiling point.
What is photosynthesis?
The process by which plants convert carbon dioxide and water into glucose and oxygen using sunlight.
What is the difference between cm and mm?
1 cm is equal to 10 mm; cm is a larger unit of length than mm.
What is an exothermic change?
A change that releases energy, such as combustion.
What happens to mass when an object is moved?
The mass does not change, regardless of the object's location.
What is the boiling point of water?
100°C
What is the chemical change when a marshmallow is put into a fire?
it burns and changes color and texture
Name a unit for mass.
Kilograms (kg) or grams (g)
How does energy flow in matter?
Energy flows from warmer matter to cooler matter.
How do you find the weight of an object?
By using a scale to measure the force of gravity on that object.
What is the melting point of ice?
0°C
What happens to matter during a chemical change?
Matter is neither created nor destroyed; it is rearranged to form new substances.
What is a milliliter?
A unit of volume equal to 1/1000 of a liter.
Explain the conservation of mass.
Matter is not created or destroyed in any chemical or physical change; it is conserved.